15 files changed, 3964 insertions, 0 deletions

diff --git a/node_modules/xss/LICENSE b/node_modules/xss/LICENSE
new file mode 100644
index 0000000..f840eb4
--- /dev/null
+++ b/node_modules/xss/LICENSE
@@ -0,0 +1,23 @@
+Copyright (c) 2012-2018 Zongmin Lei(雷宗民) <leizongmin@gmail.com>
+http://ucdok.com
+
+The MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file
diff --git a/node_modules/xss/README.md b/node_modules/xss/README.md
new file mode 100644
index 0000000..4f202f1
--- /dev/null
+++ b/node_modules/xss/README.md
@@ -0,0 +1,499 @@
+[![NPM version][npm-image]][npm-url]
+[![build status][travis-image]][travis-url]
+[![Test coverage][coveralls-image]][coveralls-url]
+[![David deps][david-image]][david-url]
+[![node version][node-image]][node-url]
+[![npm download][download-image]][download-url]
+[![npm license][license-image]][download-url]
+
+[npm-image]: https://img.shields.io/npm/v/xss.svg?style=flat-square
+[npm-url]: https://npmjs.org/package/xss
+[travis-image]: https://img.shields.io/travis/leizongmin/js-xss.svg?style=flat-square
+[travis-url]: https://travis-ci.org/leizongmin/js-xss
+[coveralls-image]: https://img.shields.io/coveralls/leizongmin/js-xss.svg?style=flat-square
+[coveralls-url]: https://coveralls.io/r/leizongmin/js-xss?branch=master
+[david-image]: https://img.shields.io/david/leizongmin/js-xss.svg?style=flat-square
+[david-url]: https://david-dm.org/leizongmin/js-xss
+[node-image]: https://img.shields.io/badge/node.js-%3E=_0.10-green.svg?style=flat-square
+[node-url]: http://nodejs.org/download/
+[download-image]: https://img.shields.io/npm/dm/xss.svg?style=flat-square
+[download-url]: https://npmjs.org/package/xss
+[license-image]: https://img.shields.io/npm/l/xss.svg
+
+# Sanitize untrusted HTML (to prevent XSS) with a configuration specified by a Whitelist.
+
+[![Greenkeeper badge](https://badges.greenkeeper.io/leizongmin/js-xss.svg)](https://greenkeeper.io/)
+
+![xss](https://nodei.co/npm/xss.png?downloads=true&stars=true)
+
+---
+
+`xss` is a module used to filter input from users to prevent XSS attacks.
+([What is XSS attack?](http://en.wikipedia.org/wiki/Cross-site_scripting))
+
+**Project Homepage:** http://jsxss.com
+
+**Try Online:** http://jsxss.com/en/try.html
+
+**[中文版文档](https://github.com/leizongmin/js-xss/blob/master/README.zh.md)**
+
+---
+
+## Features
+
+* Specifies HTML tags and their attributes allowed with whitelist
+* Handle any tags or attributes using custom function.
+
+## Reference
+
+* [XSS Filter Evasion Cheat Sheet](https://www.owasp.org/index.php/XSS_Filter_Evasion_Cheat_Sheet)
+* [Data URI scheme](http://en.wikipedia.org/wiki/Data_URI_scheme)
+* [XSS with Data URI Scheme](http://hi.baidu.com/badzzzz/item/bdbafe83144619c199255f7b)
+
+## Benchmark (for references only)
+
+* the xss module: 8.2 MB/s
+* `xss()` function from module `validator@0.3.7`: 4.4 MB/s
+
+For test code please refer to `benchmark` directory.
+
+## They are using xss module
+
+* **nodeclub** - A Node.js bbs using MongoDB - https://github.com/cnodejs/nodeclub
+* **cnpmjs.org** - Private npm registry and web for Enterprise - https://github.com/cnpm/cnpmjs.org
+
+## Install
+
+### NPM
+
+```bash
+npm install xss
+```
+
+### Bower
+
+```bash
+bower install xss
+```
+
+Or
+
+```bash
+bower install https://github.com/leizongmin/js-xss.git
+```
+
+## Usages
+
+### On Node.js
+
+```javascript
+var xss = require("xss");
+var html = xss('<script>alert("xss");</script>');
+console.log(html);
+```
+
+### On Browser
+
+Shim mode (reference file `test/test.html`):
+
+```html
+<script src="https://rawgit.com/leizongmin/js-xss/master/dist/xss.js"></script>
+<script>
+// apply function filterXSS in the same way
+var html = filterXSS('<script>alert("xss");</scr' + 'ipt>');
+alert(html);
+</script>
+```
+
+AMD mode - shim:
+
+```html
+<script>
+require.config({
+  baseUrl: './',
+  paths: {
+    xss: 'https://rawgit.com/leizongmin/js-xss/master/dist/xss.js'
+  },
+  shim: {
+    xss: {exports: 'filterXSS'}
+  }
+})
+require(['xss'], function (xss) {
+  var html = xss('<script>alert("xss");</scr' + 'ipt>');
+  alert(html);
+});
+</script>
+```
+
+**Notes: please don't use the URL https://rawgit.com/leizongmin/js-xss/master/dist/xss.js in production environment.**
+
+## Command Line Tool
+
+### Process File
+
+You can use the xss command line tool to process a file. Usage:
+
+```bash
+xss -i <input_file> -o <output_file>
+```
+
+Example:
+
+```bash
+xss -i origin.html -o target.html
+```
+
+### Active Test
+
+Run the following command, them you can type HTML
+code in the command-line, and check the filtered output:
+
+```bash
+xss -t
+```
+
+For more details, please run `$ xss -h` to see it.
+
+## Custom filter rules
+
+When using the `xss()` function, the second parameter could be used to specify
+custom rules:
+
+```javascript
+options = {}; // Custom rules
+html = xss('<script>alert("xss");</script>', options);
+```
+
+To avoid passing `options` every time, you can also do it in a faster way by
+creating a `FilterXSS` instance:
+
+```javascript
+options = {}; // Custom rules
+myxss = new xss.FilterXSS(options);
+// then apply myxss.process()
+html = myxss.process('<script>alert("xss");</script>');
+```
+
+Details of parameters in `options` would be described below.
+
+### Whitelist
+
+By specifying a `whiteList`, e.g. `{ 'tagName': [ 'attr-1', 'attr-2' ] }`. Tags
+and attributes not in the whitelist would be filter out. For example:
+
+```javascript
+// only tag a and its attributes href, title, target are allowed
+var options = {
+  whiteList: {
+    a: ["href", "title", "target"]
+  }
+};
+// With the configuration specified above, the following HTML:
+// <a href="#" onclick="hello()"><i>Hello</i></a>
+// would become:
+// <a href="#">Hello</a>
+```
+
+For the default whitelist, please refer `xss.whiteList`.
+
+### Customize the handler function for matched tags
+
+By specifying the handler function with `onTag`:
+
+```javascript
+function onTag(tag, html, options) {
+  // tag is the name of current tag, e.g. 'a' for tag <a>
+  // html is the HTML of this tag, e.g. '<a>' for tag <a>
+  // options is some addition informations:
+  //   isWhite    boolean, whether the tag is in whitelist
+  //   isClosing  boolean, whether the tag is a closing tag, e.g. true for </a>
+  //   position        integer, the position of the tag in output result
+  //   sourcePosition  integer, the position of the tag in input HTML source
+  // If a string is returned, the current tag would be replaced with the string
+  // If return nothing, the default measure would be taken:
+  //   If in whitelist: filter attributes using onTagAttr, as described below
+  //   If not in whitelist: handle by onIgnoreTag, as described below
+}
+```
+
+### Customize the handler function for attributes of matched tags
+
+By specifying the handler function with `onTagAttr`:
+
+```javascript
+function onTagAttr(tag, name, value, isWhiteAttr) {
+  // tag is the name of current tag, e.g. 'a' for tag <a>
+  // name is the name of current attribute, e.g. 'href' for href="#"
+  // isWhiteAttr whether the attribute is in whitelist
+  // If a string is returned, the attribute would be replaced with the string
+  // If return nothing, the default measure would be taken:
+  //   If in whitelist: filter the value using safeAttrValue as described below
+  //   If not in whitelist: handle by onIgnoreTagAttr, as described below
+}
+```
+
+### Customize the handler function for tags not in the whitelist
+
+By specifying the handler function with `onIgnoreTag`:
+
+```javascript
+function onIgnoreTag(tag, html, options) {
+  // Parameters are the same with onTag
+  // If a string is returned, the tag would be replaced with the string
+  // If return nothing, the default measure would be taken (specifies using
+  // escape, as described below)
+}
+```
+
+### Customize the handler function for attributes not in the whitelist
+
+By specifying the handler function with `onIgnoreTagAttr`:
+
+```javascript
+function onIgnoreTagAttr(tag, name, value, isWhiteAttr) {
+  // Parameters are the same with onTagAttr
+  // If a string is returned, the value would be replaced with this string
+  // If return nothing, then keep default (remove the attribute)
+}
+```
+
+### Customize escaping function for HTML
+
+By specifying the handler function with `escapeHtml`. Following is the default
+function **(Modification is not recommended)**:
+
+```javascript
+function escapeHtml(html) {
+  return html.replace(/</g, "&lt;").replace(/>/g, "&gt;");
+}
+```
+
+### Customize escaping function for value of attributes
+
+By specifying the handler function with `safeAttrValue`:
+
+```javascript
+function safeAttrValue(tag, name, value) {
+  // Parameters are the same with onTagAttr (without options)
+  // Return the value as a string
+}
+```
+
+### Customize CSS filter
+
+If you allow the attribute `style`, the value will be processed by [cssfilter](https://github.com/leizongmin/js-css-filter) module. The cssfilter module includes a default css whitelist. You can specify the options for cssfilter module like this:
+
+```javascript
+myxss = new xss.FilterXSS({
+  css: {
+    whiteList: {
+      position: /^fixed|relative$/,
+      top: true,
+      left: true
+    }
+  }
+});
+html = myxss.process('<script>alert("xss");</script>');
+```
+
+If you don't want to filter out the `style` content, just specify `false` to the `css` option:
+
+```javascript
+myxss = new xss.FilterXSS({
+  css: false
+});
+```
+
+For more help, please see https://github.com/leizongmin/js-css-filter
+
+### Quick Start
+
+#### Filter out tags not in the whitelist
+
+By using `stripIgnoreTag` parameter:
+
+* `true` filter out tags not in the whitelist
+* `false`: by default: escape the tag using configured `escape` function
+
+Example:
+
+If `stripIgnoreTag = true` is set, the following code:
+
+```html
+code:<script>alert(/xss/);</script>
+```
+
+would output filtered:
+
+```html
+code:alert(/xss/);
+```
+
+#### Filter out tags and tag bodies not in the whitelist
+
+By using `stripIgnoreTagBody` parameter:
+
+* `false|null|undefined` by default: do nothing
+* `'*'|true`: filter out all tags not in the whitelist
+* `['tag1', 'tag2']`: filter out only specified tags not in the whitelist
+
+Example:
+
+If `stripIgnoreTagBody = ['script']` is set, the following code:
+
+```html
+code:<script>alert(/xss/);</script>
+```
+
+would output filtered:
+
+```html
+code:
+```
+
+#### Filter out HTML comments
+
+By using `allowCommentTag` parameter:
+
+* `true`: do nothing
+* `false` by default: filter out HTML comments
+
+Example:
+
+If `allowCommentTag = false` is set, the following code:
+
+```html
+code:<!-- something --> END
+```
+
+would output filtered:
+
+```html
+code: END
+```
+
+## Examples
+
+### Allow attributes of whitelist tags start with `data-`
+
+```javascript
+var source = '<div a="1" b="2" data-a="3" data-b="4">hello</div>';
+var html = xss(source, {
+  onIgnoreTagAttr: function(tag, name, value, isWhiteAttr) {
+    if (name.substr(0, 5) === "data-") {
+      // escape its value using built-in escapeAttrValue function
+      return name + '="' + xss.escapeAttrValue(value) + '"';
+    }
+  }
+});
+
+console.log("%s\nconvert to:\n%s", source, html);
+```
+
+Result:
+
+```html
+<div a="1" b="2" data-a="3" data-b="4">hello</div>
+convert to:
+<div data-a="3" data-b="4">hello</div>
+```
+
+### Allow tags start with `x-`
+
+```javascript
+var source = "<x><x-1>he<x-2 checked></x-2>wwww</x-1><a>";
+var html = xss(source, {
+  onIgnoreTag: function(tag, html, options) {
+    if (tag.substr(0, 2) === "x-") {
+      // do not filter its attributes
+      return html;
+    }
+  }
+});
+
+console.log("%s\nconvert to:\n%s", source, html);
+```
+
+Result:
+
+```html
+<x><x-1>he<x-2 checked></x-2>wwww</x-1><a>
+convert to:
+&lt;x&gt;<x-1>he<x-2 checked></x-2>wwww</x-1><a>
+```
+
+### Parse images in HTML
+
+```javascript
+var source =
+  '<img src="img1">a<img src="img2">b<img src="img3">c<img src="img4">d';
+var list = [];
+var html = xss(source, {
+  onTagAttr: function(tag, name, value, isWhiteAttr) {
+    if (tag === "img" && name === "src") {
+      // Use the built-in friendlyAttrValue function to escape attribute
+      // values. It supports converting entity tags such as &lt; to printable
+      // characters such as <
+      list.push(xss.friendlyAttrValue(value));
+    }
+    // Return nothing, means keep the default handling measure
+  }
+});
+
+console.log("image list:\n%s", list.join(", "));
+```
+
+Result:
+
+```html
+image list:
+img1, img2, img3, img4
+```
+
+### Filter out HTML tags (keeps only plain text)
+
+```javascript
+var source = "<strong>hello</strong><script>alert(/xss/);</script>end";
+var html = xss(source, {
+  whiteList: [], // empty, means filter out all tags
+  stripIgnoreTag: true, // filter out all HTML not in the whilelist
+  stripIgnoreTagBody: ["script"] // the script tag is a special case, we need
+  // to filter out its content
+});
+
+console.log("text: %s", html);
+```
+
+Result:
+
+```html
+text: helloend
+```
+
+## License
+
+```text
+Copyright (c) 2012-2018 Zongmin Lei(雷宗民) <leizongmin@gmail.com>
+http://ucdok.com
+
+The MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+```
diff --git a/node_modules/xss/README.zh.md b/node_modules/xss/README.zh.md
new file mode 100644
index 0000000..2483d4d
--- /dev/null
+++ b/node_modules/xss/README.zh.md
@@ -0,0 +1,485 @@
+[![NPM version][npm-image]][npm-url]
+[![build status][travis-image]][travis-url]
+[![Test coverage][coveralls-image]][coveralls-url]
+[![David deps][david-image]][david-url]
+[![node version][node-image]][node-url]
+[![npm download][download-image]][download-url]
+[![npm license][license-image]][download-url]
+
+[npm-image]: https://img.shields.io/npm/v/xss.svg?style=flat-square
+[npm-url]: https://npmjs.org/package/xss
+[travis-image]: https://img.shields.io/travis/leizongmin/js-xss.svg?style=flat-square
+[travis-url]: https://travis-ci.org/leizongmin/js-xss
+[coveralls-image]: https://img.shields.io/coveralls/leizongmin/js-xss.svg?style=flat-square
+[coveralls-url]: https://coveralls.io/r/leizongmin/js-xss?branch=master
+[david-image]: https://img.shields.io/david/leizongmin/js-xss.svg?style=flat-square
+[david-url]: https://david-dm.org/leizongmin/js-xss
+[node-image]: https://img.shields.io/badge/node.js-%3E=_0.10-green.svg?style=flat-square
+[node-url]: http://nodejs.org/download/
+[download-image]: https://img.shields.io/npm/dm/xss.svg?style=flat-square
+[download-url]: https://npmjs.org/package/xss
+[license-image]: https://img.shields.io/npm/l/xss.svg
+
+# 根据白名单过滤 HTML(防止 XSS 攻击)
+
+![xss](https://nodei.co/npm/xss.png?downloads=true&stars=true)
+
+---
+
+`xss`是一个用于对用户输入的内容进行过滤，以避免遭受 XSS 攻击的模块（[什么是 XSS 攻击？](http://baike.baidu.com/view/2161269.htm)）。主要用于论坛、博客、网上商店等等一些可允许用户录入页面排版、格式控制相关的 HTML 的场景，`xss`模块通过白名单来控制允许的标签及相关的标签属性，另外还提供了一系列的接口以便用户扩展，比其他同类模块更为灵活。
+
+**项目主页：** http://jsxss.com
+
+**在线测试：** http://jsxss.com/zh/try.html
+
+---
+
+## 特性
+
+* 白名单控制允许的 HTML 标签及各标签的属性
+* 通过自定义处理函数，可对任意标签及其属性进行处理
+
+## 参考资料
+
+* [XSS 与字符编码的那些事儿 ---科普文](http://drops.wooyun.org/tips/689)
+* [腾讯实例教程：那些年我们一起学 XSS](http://www.wooyun.org/whitehats/%E5%BF%83%E4%BC%A4%E7%9A%84%E7%98%A6%E5%AD%90)
+* [mXSS 攻击的成因及常见种类](http://drops.wooyun.org/tips/956)
+* [XSS Filter Evasion Cheat Sheet](https://www.owasp.org/index.php/XSS_Filter_Evasion_Cheat_Sheet)
+* [Data URI scheme](http://en.wikipedia.org/wiki/Data_URI_scheme)
+* [XSS with Data URI Scheme](http://hi.baidu.com/badzzzz/item/bdbafe83144619c199255f7b)
+
+## 性能（仅作参考）
+
+* xss 模块：8.2 MB/s
+* validator@0.3.7 模块的 xss()函数：4.4 MB/s
+
+测试代码参考 benchmark 目录
+
+## 安装
+
+### NPM
+
+```bash
+npm install xss
+```
+
+### Bower
+
+```bash
+bower install xss
+```
+
+或者
+
+```bash
+bower install https://github.com/leizongmin/js-xss.git
+```
+
+## 使用方法
+
+### 在 Node.js 中使用
+
+```javascript
+var xss = require("xss");
+var html = xss('<script>alert("xss");</script>');
+console.log(html);
+```
+
+### 在浏览器端使用
+
+Shim 模式（参考文件 `test/test.html`）:
+
+```html
+<script src="https://rawgit.com/leizongmin/js-xss/master/dist/xss.js"></script>
+<script>
+// 使用函数名 filterXSS，用法一样
+var html = filterXSS('<script>alert("xss");</scr' + 'ipt>');
+alert(html);
+</script>
+```
+
+AMD 模式（参考文件 `test/test_amd.html`）:
+
+```html
+<script>
+require.config({
+  baseUrl: './',
+  paths: {
+    xss: 'https://rawgit.com/leizongmin/js-xss/master/dist/xss.js'
+  },
+  shim: {
+    xss: {exports: 'filterXSS'}
+  }
+})
+require(['xss'], function (xss) {
+  var html = xss('<script>alert("xss");</scr' + 'ipt>');
+  alert(html);
+});
+</script>
+```
+
+**说明：请勿将 URL https://rawgit.com/leizongmin/js-xss/master/dist/xss.js 用于生产环境。**
+
+### 使用命令行工具来对文件进行 XSS 处理
+
+### 处理文件
+
+可通过内置的 `xss` 命令来对输入的文件进行 XSS 处理。使用方法：
+
+```bash
+xss -i <源文件> -o <目标文件>
+```
+
+例：
+
+```bash
+xss -i origin.html -o target.html
+```
+
+### 在线测试
+
+执行以下命令，可在命令行中输入 HTML 代码，并看到过滤后的代码：
+
+```bash
+xss -t
+```
+
+详细命令行参数说明，请输入 `$ xss -h` 来查看。
+
+## 自定义过滤规则
+
+在调用 `xss()` 函数进行过滤时，可通过第二个参数来设置自定义规则：
+
+```javascript
+options = {}; // 自定义规则
+html = xss('<script>alert("xss");</script>', options);
+```
+
+如果不想每次都传入一个 `options` 参数，可以创建一个 `FilterXSS` 实例（使用这种方法速度更快）：
+
+```
+options = {};  // 自定义规则
+myxss = new xss.FilterXSS(options);
+// 以后直接调用 myxss.process() 来处理即可
+html = myxss.process('<script>alert("xss");</script>');
+```
+
+`options` 参数的详细说明见下文。
+
+### 白名单
+
+通过 `whiteList` 来指定，格式为：`{'标签名': ['属性1', '属性2']}`。不在白名单上的标签将被过滤，不在白名单上的属性也会被过滤。以下是示例：
+
+```javascript
+// 只允许a标签，该标签只允许href, title, target这三个属性
+var options = {
+  whiteList: {
+    a: ["href", "title", "target"]
+  }
+};
+// 使用以上配置后，下面的HTML
+// <a href="#" onclick="hello()"><i>大家好</i></a>
+// 将被过滤为
+// <a href="#">大家好</a>
+```
+
+默认白名单参考 `xss.whiteList`。
+
+### 自定义匹配到标签时的处理方法
+
+通过 `onTag` 来指定相应的处理函数。以下是详细说明：
+
+```javascript
+function onTag(tag, html, options) {
+  // tag是当前的标签名称，比如<a>标签，则tag的值是'a'
+  // html是该标签的HTML，比如<a>标签，则html的值是'<a>'
+  // options是一些附加的信息，具体如下：
+  //   isWhite    boolean类型，表示该标签是否在白名单上
+  //   isClosing  boolean类型，表示该标签是否为闭合标签，比如</a>时为true
+  //   position        integer类型，表示当前标签在输出的结果中的起始位置
+  //   sourcePosition  integer类型，表示当前标签在原HTML中的起始位置
+  // 如果返回一个字符串，则当前标签将被替换为该字符串
+  // 如果不返回任何值，则使用默认的处理方法：
+  //   在白名单上：  通过onTagAttr来过滤属性，详见下文
+  //   不在白名单上：通过onIgnoreTag指定，详见下文
+}
+```
+
+### 自定义匹配到标签的属性时的处理方法
+
+通过 `onTagAttr` 来指定相应的处理函数。以下是详细说明：
+
+```javascript
+function onTagAttr(tag, name, value, isWhiteAttr) {
+  // tag是当前的标签名称，比如<a>标签，则tag的值是'a'
+  // name是当前属性的名称，比如href="#"，则name的值是'href'
+  // value是当前属性的值，比如href="#"，则value的值是'#'
+  // isWhiteAttr是否为白名单上的属性
+  // 如果返回一个字符串，则当前属性值将被替换为该字符串
+  // 如果不返回任何值，则使用默认的处理方法
+  //   在白名单上：  调用safeAttrValue来过滤属性值，并输出该属性，详见下文
+  //   不在白名单上：通过onIgnoreTagAttr指定，详见下文
+}
+```
+
+### 自定义匹配到不在白名单上的标签时的处理方法
+
+通过 `onIgnoreTag` 来指定相应的处理函数。以下是详细说明：
+
+```javascript
+function onIgnoreTag(tag, html, options) {
+  // 参数说明与onTag相同
+  // 如果返回一个字符串，则当前标签将被替换为该字符串
+  // 如果不返回任何值，则使用默认的处理方法（通过escape指定，详见下文）
+}
+```
+
+### 自定义匹配到不在白名单上的属性时的处理方法
+
+通过 `onIgnoreTagAttr` 来指定相应的处理函数。以下是详细说明：
+
+```javascript
+function onIgnoreTagAttr(tag, name, value, isWhiteAttr) {
+  // 参数说明与onTagAttr相同
+  // 如果返回一个字符串，则当前属性值将被替换为该字符串
+  // 如果不返回任何值，则使用默认的处理方法（删除该属）
+}
+```
+
+### 自定义 HTML 转义函数
+
+通过 `escapeHtml` 来指定相应的处理函数。以下是默认代码 **（不建议修改）** ：
+
+```javascript
+function escapeHtml(html) {
+  return html.replace(/</g, "&lt;").replace(/>/g, "&gt;");
+}
+```
+
+### 自定义标签属性值的转义函数
+
+通过 `safeAttrValue` 来指定相应的处理函数。以下是详细说明：
+
+```javascript
+function safeAttrValue(tag, name, value) {
+  // 参数说明与onTagAttr相同（没有options参数）
+  // 返回一个字符串表示该属性值
+}
+```
+
+### 自定义 CSS 过滤器
+
+如果配置中允许了标签的 `style` 属性，则它的值会通过[cssfilter](https://github.com/leizongmin/js-css-filter) 模块处理。
+`cssfilter` 模块包含了一个默认的 CSS 白名单，你可以通过以下的方式配置：
+
+```javascript
+myxss = new xss.FilterXSS({
+  css: {
+    whiteList: {
+      position: /^fixed|relative$/,
+      top: true,
+      left: true
+    }
+  }
+});
+html = myxss.process('<script>alert("xss");</script>');
+```
+
+如果不想使用 CSS 过滤器来处理 `style` 属性的内容，可指定 `css` 选项的值为 `false`：
+
+```javascript
+myxss = new xss.FilterXSS({
+  css: false
+});
+```
+
+要获取更多的帮助信息可看这里：https://github.com/leizongmin/js-css-filter
+
+### 快捷配置
+
+#### 去掉不在白名单上的标签
+
+通过 `stripIgnoreTag` 来设置：
+
+* `true`：去掉不在白名单上的标签
+* `false`：（默认），使用配置的`escape`函数对该标签进行转义
+
+示例：
+
+当设置 `stripIgnoreTag = true`时，以下代码
+
+```html
+code:<script>alert(/xss/);</script>
+```
+
+过滤后将输出
+
+```html
+code:alert(/xss/);
+```
+
+#### 去掉不在白名单上的标签及标签体
+
+通过 `stripIgnoreTagBody` 来设置：
+
+* `false|null|undefined`：（默认），不特殊处理
+* `'*'|true`：去掉所有不在白名单上的标签
+* `['tag1', 'tag2']`：仅去掉指定的不在白名单上的标签
+
+示例：
+
+当设置 `stripIgnoreTagBody = ['script']`时，以下代码
+
+```html
+code:<script>alert(/xss/);</script>
+```
+
+过滤后将输出
+
+```html
+code:
+```
+
+#### 去掉 HTML 备注
+
+通过 `allowCommentTag` 来设置：
+
+* `true`：不处理
+* `false`：（默认），自动去掉 HTML 中的备注
+
+示例：
+
+当设置 `allowCommentTag = false` 时，以下代码
+
+```html
+code:<!-- something --> END
+```
+
+过滤后将输出
+
+```html
+code: END
+```
+
+## 应用实例
+
+### 允许标签以 data-开头的属性
+
+```javascript
+var source = '<div a="1" b="2" data-a="3" data-b="4">hello</div>';
+var html = xss(source, {
+  onIgnoreTagAttr: function(tag, name, value, isWhiteAttr) {
+    if (name.substr(0, 5) === "data-") {
+      // 通过内置的escapeAttrValue函数来对属性值进行转义
+      return name + '="' + xss.escapeAttrValue(value) + '"';
+    }
+  }
+});
+
+console.log("%s\nconvert to:\n%s", source, html);
+```
+
+运行结果：
+
+```html
+<div a="1" b="2" data-a="3" data-b="4">hello</div>
+convert to:
+<div data-a="3" data-b="4">hello</div>
+```
+
+### 允许名称以 x-开头的标签
+
+```javascript
+var source = "<x><x-1>he<x-2 checked></x-2>wwww</x-1><a>";
+var html = xss(source, {
+  onIgnoreTag: function(tag, html, options) {
+    if (tag.substr(0, 2) === "x-") {
+      // 不对其属性列表进行过滤
+      return html;
+    }
+  }
+});
+
+console.log("%s\nconvert to:\n%s", source, html);
+```
+
+运行结果：
+
+```html
+<x><x-1>he<x-2 checked></x-2>wwww</x-1><a>
+convert to:
+&lt;x&gt;<x-1>he<x-2 checked></x-2>wwww</x-1><a>
+```
+
+### 分析 HTML 代码中的图片列表
+
+```javascript
+var source =
+  '<img src="img1">a<img src="img2">b<img src="img3">c<img src="img4">d';
+var list = [];
+var html = xss(source, {
+  onTagAttr: function(tag, name, value, isWhiteAttr) {
+    if (tag === "img" && name === "src") {
+      // 使用内置的friendlyAttrValue函数来对属性值进行转义，可将&lt;这类的实体标记转换成打印字符<
+      list.push(xss.friendlyAttrValue(value));
+    }
+    // 不返回任何值，表示还是按照默认的方法处理
+  }
+});
+
+console.log("image list:\n%s", list.join(", "));
+```
+
+运行结果：
+
+```html
+image list:
+img1, img2, img3, img4
+```
+
+### 去除 HTML 标签（只保留文本内容）
+
+```javascript
+var source = "<strong>hello</strong><script>alert(/xss/);</script>end";
+var html = xss(source, {
+  whiteList: [], // 白名单为空，表示过滤所有标签
+  stripIgnoreTag: true, // 过滤所有非白名单标签的HTML
+  stripIgnoreTagBody: ["script"] // script标签较特殊，需要过滤标签中间的内容
+});
+
+console.log("text: %s", html);
+```
+
+运行结果：
+
+```html
+text: helloend
+```
+
+## 授权协议
+
+```text
+Copyright (c) 2012-2018 Zongmin Lei(雷宗民) <leizongmin@gmail.com>
+http://ucdok.com
+
+The MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+```
diff --git a/node_modules/xss/bin/xss b/node_modules/xss/bin/xss
new file mode 100755
index 0000000..35e902f
--- /dev/null
+++ b/node_modules/xss/bin/xss
@@ -0,0 +1,67 @@
+#!/usr/bin/env node
+
+/**
+ * 命令行工具
+ *
+ * @author Zongmin Lei<leizongmin@gmail.com>
+ */
+
+var fs = require('fs');
+var path = require('path');
+var program = require('commander');
+var xss = require('../');
+var packageInfo = require('../package.json');
+
+program
+  .version(packageInfo.version)
+  .option('-t, --test', 'active test')
+  .option('-i, --input <input_file>', 'input file name')
+  .option('-o, --output <output_file>', 'output filename')
+  .option('-c, --config <config_file>', 'load custom config')
+  .option('-s, --strip-ignore-tag', 'set stripIgnoreTag=true')
+  .option('-b, --strip-ignore-tag-body', 'set stripIgnoreTagBody=true');
+
+program.on('--help', function () {
+  console.log('  Examples:');
+  console.log('');
+  console.log('    $ xss -t');
+  console.log('    $ xss -i origin.html');
+  console.log('    $ xss -i origin.html -o targer.html');
+  console.log('    $ xss -i origin.html -c config.js');
+  console.log('    $ xss -i origin.html -s');
+  console.log('    $ xss -i origin.html -s -b');
+  console.log('');
+  console.log('  For more details, please see: https://npmjs.org/package/xss')
+});
+
+program.parse(process.argv);
+
+if (program.test) {
+  require('../lib/cli');
+  return;
+}
+
+var config = {};
+if (program.config) {
+  config = require(path.resolve(program.config));
+}
+if (program.input) {
+  var input = fs.readFileSync(program.input, 'utf8');
+} else {
+  program.help();
+}
+
+if (program['strip-ignore-tag']) {
+  config.stripIgnoreTag = true;
+}
+if (program['strip-ignore-tag-body']) {
+  config.stripIgnoreTagBody = true;
+}
+
+var output = xss(input, config);
+
+if (program.output) {
+  fs.writeFileSync(program.output, output);
+} else {
+  console.log(output);
+}
diff --git a/node_modules/xss/dist/test.html b/node_modules/xss/dist/test.html
new file mode 100644
index 0000000..cae361e
--- /dev/null
+++ b/node_modules/xss/dist/test.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<html>
+<head>
+  <title>测试</title>
+  <meta charset="utf8">
+</head>
+<body>
+  <pre id="result"></pre>
+</body>
+</html>
+<script src="xss.js"></script>
+<script>
+var code = '<script>alert("xss");</' + 'script>';
+document.querySelector('#result').innerText = code + '\n被转换成了\n' + filterXSS(code);
+</script>
\ No newline at end of file
diff --git a/node_modules/xss/dist/xss.js b/node_modules/xss/dist/xss.js
new file mode 100644
index 0000000..9583a6b
--- /dev/null
+++ b/node_modules/xss/dist/xss.js
@@ -0,0 +1,1609 @@
+(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+/**
+ * default settings
+ *
+ * @author Zongmin Lei<leizongmin@gmail.com>
+ */
+
+var FilterCSS = require("cssfilter").FilterCSS;
+var getDefaultCSSWhiteList = require("cssfilter").getDefaultWhiteList;
+var _ = require("./util");
+
+function getDefaultWhiteList() {
+  return {
+    a: ["target", "href", "title"],
+    abbr: ["title"],
+    address: [],
+    area: ["shape", "coords", "href", "alt"],
+    article: [],
+    aside: [],
+    audio: ["autoplay", "controls", "loop", "preload", "src"],
+    b: [],
+    bdi: ["dir"],
+    bdo: ["dir"],
+    big: [],
+    blockquote: ["cite"],
+    br: [],
+    caption: [],
+    center: [],
+    cite: [],
+    code: [],
+    col: ["align", "valign", "span", "width"],
+    colgroup: ["align", "valign", "span", "width"],
+    dd: [],
+    del: ["datetime"],
+    details: ["open"],
+    div: [],
+    dl: [],
+    dt: [],
+    em: [],
+    font: ["color", "size", "face"],
+    footer: [],
+    h1: [],
+    h2: [],
+    h3: [],
+    h4: [],
+    h5: [],
+    h6: [],
+    header: [],
+    hr: [],
+    i: [],
+    img: ["src", "alt", "title", "width", "height"],
+    ins: ["datetime"],
+    li: [],
+    mark: [],
+    nav: [],
+    ol: [],
+    p: [],
+    pre: [],
+    s: [],
+    section: [],
+    small: [],
+    span: [],
+    sub: [],
+    sup: [],
+    strong: [],
+    table: ["width", "border", "align", "valign"],
+    tbody: ["align", "valign"],
+    td: ["width", "rowspan", "colspan", "align", "valign"],
+    tfoot: ["align", "valign"],
+    th: ["width", "rowspan", "colspan", "align", "valign"],
+    thead: ["align", "valign"],
+    tr: ["rowspan", "align", "valign"],
+    tt: [],
+    u: [],
+    ul: [],
+    video: ["autoplay", "controls", "loop", "preload", "src", "height", "width"]
+  };
+}
+
+var defaultCSSFilter = new FilterCSS();
+
+/**
+ * default onTag function
+ *
+ * @param {String} tag
+ * @param {String} html
+ * @param {Object} options
+ * @return {String}
+ */
+function onTag(tag, html, options) {
+  // do nothing
+}
+
+/**
+ * default onIgnoreTag function
+ *
+ * @param {String} tag
+ * @param {String} html
+ * @param {Object} options
+ * @return {String}
+ */
+function onIgnoreTag(tag, html, options) {
+  // do nothing
+}
+
+/**
+ * default onTagAttr function
+ *
+ * @param {String} tag
+ * @param {String} name
+ * @param {String} value
+ * @return {String}
+ */
+function onTagAttr(tag, name, value) {
+  // do nothing
+}
+
+/**
+ * default onIgnoreTagAttr function
+ *
+ * @param {String} tag
+ * @param {String} name
+ * @param {String} value
+ * @return {String}
+ */
+function onIgnoreTagAttr(tag, name, value) {
+  // do nothing
+}
+
+/**
+ * default escapeHtml function
+ *
+ * @param {String} html
+ */
+function escapeHtml(html) {
+  return html.replace(REGEXP_LT, "&lt;").replace(REGEXP_GT, "&gt;");
+}
+
+/**
+ * default safeAttrValue function
+ *
+ * @param {String} tag
+ * @param {String} name
+ * @param {String} value
+ * @param {Object} cssFilter
+ * @return {String}
+ */
+function safeAttrValue(tag, name, value, cssFilter) {
+  // unescape attribute value firstly
+  value = friendlyAttrValue(value);
+
+  if (name === "href" || name === "src") {
+    // filter `href` and `src` attribute
+    // only allow the value that starts with `http://` | `https://` | `mailto:` | `/` | `#`
+    value = _.trim(value);
+    if (value === "#") return "#";
+    if (
+      !(
+        value.substr(0, 7) === "http://" ||
+        value.substr(0, 8) === "https://" ||
+        value.substr(0, 7) === "mailto:" ||
+        value.substr(0, 4) === "tel:" ||
+        value[0] === "#" ||
+        value[0] === "/"
+      )
+    ) {
+      return "";
+    }
+  } else if (name === "background") {
+    // filter `background` attribute (maybe no use)
+    // `javascript:`
+    REGEXP_DEFAULT_ON_TAG_ATTR_4.lastIndex = 0;
+    if (REGEXP_DEFAULT_ON_TAG_ATTR_4.test(value)) {
+      return "";
+    }
+  } else if (name === "style") {
+    // `expression()`
+    REGEXP_DEFAULT_ON_TAG_ATTR_7.lastIndex = 0;
+    if (REGEXP_DEFAULT_ON_TAG_ATTR_7.test(value)) {
+      return "";
+    }
+    // `url()`
+    REGEXP_DEFAULT_ON_TAG_ATTR_8.lastIndex = 0;
+    if (REGEXP_DEFAULT_ON_TAG_ATTR_8.test(value)) {
+      REGEXP_DEFAULT_ON_TAG_ATTR_4.lastIndex = 0;
+      if (REGEXP_DEFAULT_ON_TAG_ATTR_4.test(value)) {
+        return "";
+      }
+    }
+    if (cssFilter !== false) {
+      cssFilter = cssFilter || defaultCSSFilter;
+      value = cssFilter.process(value);
+    }
+  }
+
+  // escape `<>"` before returns
+  value = escapeAttrValue(value);
+  return value;
+}
+
+// RegExp list
+var REGEXP_LT = /</g;
+var REGEXP_GT = />/g;
+var REGEXP_QUOTE = /"/g;
+var REGEXP_QUOTE_2 = /&quot;/g;
+var REGEXP_ATTR_VALUE_1 = /&#([a-zA-Z0-9]*);?/gim;
+var REGEXP_ATTR_VALUE_COLON = /&colon;?/gim;
+var REGEXP_ATTR_VALUE_NEWLINE = /&newline;?/gim;
+var REGEXP_DEFAULT_ON_TAG_ATTR_3 = /\/\*|\*\//gm;
+var REGEXP_DEFAULT_ON_TAG_ATTR_4 = /((j\s*a\s*v\s*a|v\s*b|l\s*i\s*v\s*e)\s*s\s*c\s*r\s*i\s*p\s*t\s*|m\s*o\s*c\s*h\s*a)\:/gi;
+var REGEXP_DEFAULT_ON_TAG_ATTR_5 = /^[\s"'`]*(d\s*a\s*t\s*a\s*)\:/gi;
+var REGEXP_DEFAULT_ON_TAG_ATTR_6 = /^[\s"'`]*(d\s*a\s*t\s*a\s*)\:\s*image\//gi;
+var REGEXP_DEFAULT_ON_TAG_ATTR_7 = /e\s*x\s*p\s*r\s*e\s*s\s*s\s*i\s*o\s*n\s*\(.*/gi;
+var REGEXP_DEFAULT_ON_TAG_ATTR_8 = /u\s*r\s*l\s*\(.*/gi;
+
+/**
+ * escape doube quote
+ *
+ * @param {String} str
+ * @return {String} str
+ */
+function escapeQuote(str) {
+  return str.replace(REGEXP_QUOTE, "&quot;");
+}
+
+/**
+ * unescape double quote
+ *
+ * @param {String} str
+ * @return {String} str
+ */
+function unescapeQuote(str) {
+  return str.replace(REGEXP_QUOTE_2, '"');
+}
+
+/**
+ * escape html entities
+ *
+ * @param {String} str
+ * @return {String}
+ */
+function escapeHtmlEntities(str) {
+  return str.replace(REGEXP_ATTR_VALUE_1, function replaceUnicode(str, code) {
+    return code[0] === "x" || code[0] === "X"
+      ? String.fromCharCode(parseInt(code.substr(1), 16))
+      : String.fromCharCode(parseInt(code, 10));
+  });
+}
+
+/**
+ * escape html5 new danger entities
+ *
+ * @param {String} str
+ * @return {String}
+ */
+function escapeDangerHtml5Entities(str) {
+  return str
+    .replace(REGEXP_ATTR_VALUE_COLON, ":")
+    .replace(REGEXP_ATTR_VALUE_NEWLINE, " ");
+}
+
+/**
+ * clear nonprintable characters
+ *
+ * @param {String} str
+ * @return {String}
+ */
+function clearNonPrintableCharacter(str) {
+  var str2 = "";
+  for (var i = 0, len = str.length; i < len; i++) {
+    str2 += str.charCodeAt(i) < 32 ? " " : str.charAt(i);
+  }
+  return _.trim(str2);
+}
+
+/**
+ * get friendly attribute value
+ *
+ * @param {String} str
+ * @return {String}
+ */
+function friendlyAttrValue(str) {
+  str = unescapeQuote(str);
+  str = escapeHtmlEntities(str);
+  str = escapeDangerHtml5Entities(str);
+  str = clearNonPrintableCharacter(str);
+  return str;
+}
+
+/**
+ * unescape attribute value
+ *
+ * @param {String} str
+ * @return {String}
+ */
+function escapeAttrValue(str) {
+  str = escapeQuote(str);
+  str = escapeHtml(str);
+  return str;
+}
+
+/**
+ * `onIgnoreTag` function for removing all the tags that are not in whitelist
+ */
+function onIgnoreTagStripAll() {
+  return "";
+}
+
+/**
+ * remove tag body
+ * specify a `tags` list, if the tag is not in the `tags` list then process by the specify function (optional)
+ *
+ * @param {array} tags
+ * @param {function} next
+ */
+function StripTagBody(tags, next) {
+  if (typeof next !== "function") {
+    next = function() {};
+  }
+
+  var isRemoveAllTag = !Array.isArray(tags);
+  function isRemoveTag(tag) {
+    if (isRemoveAllTag) return true;
+    return _.indexOf(tags, tag) !== -1;
+  }
+
+  var removeList = [];
+  var posStart = false;
+
+  return {
+    onIgnoreTag: function(tag, html, options) {
+      if (isRemoveTag(tag)) {
+        if (options.isClosing) {
+          var ret = "[/removed]";
+          var end = options.position + ret.length;
+          removeList.push([
+            posStart !== false ? posStart : options.position,
+            end
+          ]);
+          posStart = false;
+          return ret;
+        } else {
+          if (!posStart) {
+            posStart = options.position;
+          }
+          return "[removed]";
+        }
+      } else {
+        return next(tag, html, options);
+      }
+    },
+    remove: function(html) {
+      var rethtml = "";
+      var lastPos = 0;
+      _.forEach(removeList, function(pos) {
+        rethtml += html.slice(lastPos, pos[0]);
+        lastPos = pos[1];
+      });
+      rethtml += html.slice(lastPos);
+      return rethtml;
+    }
+  };
+}
+
+/**
+ * remove html comments
+ *
+ * @param {String} html
+ * @return {String}
+ */
+function stripCommentTag(html) {
+  return html.replace(STRIP_COMMENT_TAG_REGEXP, "");
+}
+var STRIP_COMMENT_TAG_REGEXP = /<!--[\s\S]*?-->/g;
+
+/**
+ * remove invisible characters
+ *
+ * @param {String} html
+ * @return {String}
+ */
+function stripBlankChar(html) {
+  var chars = html.split("");
+  chars = chars.filter(function(char) {
+    var c = char.charCodeAt(0);
+    if (c === 127) return false;
+    if (c <= 31) {
+      if (c === 10 || c === 13) return true;
+      return false;
+    }
+    return true;
+  });
+  return chars.join("");
+}
+
+exports.whiteList = getDefaultWhiteList();
+exports.getDefaultWhiteList = getDefaultWhiteList;
+exports.onTag = onTag;
+exports.onIgnoreTag = onIgnoreTag;
+exports.onTagAttr = onTagAttr;
+exports.onIgnoreTagAttr = onIgnoreTagAttr;
+exports.safeAttrValue = safeAttrValue;
+exports.escapeHtml = escapeHtml;
+exports.escapeQuote = escapeQuote;
+exports.unescapeQuote = unescapeQuote;
+exports.escapeHtmlEntities = escapeHtmlEntities;
+exports.escapeDangerHtml5Entities = escapeDangerHtml5Entities;
+exports.clearNonPrintableCharacter = clearNonPrintableCharacter;
+exports.friendlyAttrValue = friendlyAttrValue;
+exports.escapeAttrValue = escapeAttrValue;
+exports.onIgnoreTagStripAll = onIgnoreTagStripAll;
+exports.StripTagBody = StripTagBody;
+exports.stripCommentTag = stripCommentTag;
+exports.stripBlankChar = stripBlankChar;
+exports.cssFilter = defaultCSSFilter;
+exports.getDefaultCSSWhiteList = getDefaultCSSWhiteList;
+
+},{"./util":4,"cssfilter":8}],2:[function(require,module,exports){
+/**
+ * xss
+ *
+ * @author Zongmin Lei<leizongmin@gmail.com>
+ */
+
+var DEFAULT = require("./default");
+var parser = require("./parser");
+var FilterXSS = require("./xss");
+
+/**
+ * filter xss function
+ *
+ * @param {String} html
+ * @param {Object} options { whiteList, onTag, onTagAttr, onIgnoreTag, onIgnoreTagAttr, safeAttrValue, escapeHtml }
+ * @return {String}
+ */
+function filterXSS(html, options) {
+  var xss = new FilterXSS(options);
+  return xss.process(html);
+}
+
+exports = module.exports = filterXSS;
+exports.filterXSS = filterXSS;
+exports.FilterXSS = FilterXSS;
+for (var i in DEFAULT) exports[i] = DEFAULT[i];
+for (var i in parser) exports[i] = parser[i];
+
+// using `xss` on the browser, output `filterXSS` to the globals
+if (typeof window !== "undefined") {
+  window.filterXSS = module.exports;
+}
+
+// using `xss` on the WebWorker, output `filterXSS` to the globals
+function isWorkerEnv() {
+  return typeof self !== 'undefined' && typeof DedicatedWorkerGlobalScope !== 'undefined' && self instanceof DedicatedWorkerGlobalScope;
+}
+if (isWorkerEnv()) {
+  self.filterXSS = module.exports;
+}
+
+},{"./default":1,"./parser":3,"./xss":5}],3:[function(require,module,exports){
+/**
+ * Simple HTML Parser
+ *
+ * @author Zongmin Lei<leizongmin@gmail.com>
+ */
+
+var _ = require("./util");
+
+/**
+ * get tag name
+ *
+ * @param {String} html e.g. '<a hef="#">'
+ * @return {String}
+ */
+function getTagName(html) {
+  var i = _.spaceIndex(html);
+  if (i === -1) {
+    var tagName = html.slice(1, -1);
+  } else {
+    var tagName = html.slice(1, i + 1);
+  }
+  tagName = _.trim(tagName).toLowerCase();
+  if (tagName.slice(0, 1) === "/") tagName = tagName.slice(1);
+  if (tagName.slice(-1) === "/") tagName = tagName.slice(0, -1);
+  return tagName;
+}
+
+/**
+ * is close tag?
+ *
+ * @param {String} html 如：'<a hef="#">'
+ * @return {Boolean}
+ */
+function isClosing(html) {
+  return html.slice(0, 2) === "</";
+}
+
+/**
+ * parse input html and returns processed html
+ *
+ * @param {String} html
+ * @param {Function} onTag e.g. function (sourcePosition, position, tag, html, isClosing)
+ * @param {Function} escapeHtml
+ * @return {String}
+ */
+function parseTag(html, onTag, escapeHtml) {
+  "user strict";
+
+  var rethtml = "";
+  var lastPos = 0;
+  var tagStart = false;
+  var quoteStart = false;
+  var currentPos = 0;
+  var len = html.length;
+  var currentTagName = "";
+  var currentHtml = "";
+
+  for (currentPos = 0; currentPos < len; currentPos++) {
+    var c = html.charAt(currentPos);
+    if (tagStart === false) {
+      if (c === "<") {
+        tagStart = currentPos;
+        continue;
+      }
+    } else {
+      if (quoteStart === false) {
+        if (c === "<") {
+          rethtml += escapeHtml(html.slice(lastPos, currentPos));
+          tagStart = currentPos;
+          lastPos = currentPos;
+          continue;
+        }
+        if (c === ">") {
+          rethtml += escapeHtml(html.slice(lastPos, tagStart));
+          currentHtml = html.slice(tagStart, currentPos + 1);
+          currentTagName = getTagName(currentHtml);
+          rethtml += onTag(
+            tagStart,
+            rethtml.length,
+            currentTagName,
+            currentHtml,
+            isClosing(currentHtml)
+          );
+          lastPos = currentPos + 1;
+          tagStart = false;
+          continue;
+        }
+        if ((c === '"' || c === "'") && html.charAt(currentPos - 1) === "=") {
+          quoteStart = c;
+          continue;
+        }
+      } else {
+        if (c === quoteStart) {
+          quoteStart = false;
+          continue;
+        }
+      }
+    }
+  }
+  if (lastPos < html.length) {
+    rethtml += escapeHtml(html.substr(lastPos));
+  }
+
+  return rethtml;
+}
+
+var REGEXP_ILLEGAL_ATTR_NAME = /[^a-zA-Z0-9_:\.\-]/gim;
+
+/**
+ * parse input attributes and returns processed attributes
+ *
+ * @param {String} html e.g. `href="#" target="_blank"`
+ * @param {Function} onAttr e.g. `function (name, value)`
+ * @return {String}
+ */
+function parseAttr(html, onAttr) {
+  "user strict";
+
+  var lastPos = 0;
+  var retAttrs = [];
+  var tmpName = false;
+  var len = html.length;
+
+  function addAttr(name, value) {
+    name = _.trim(name);
+    name = name.replace(REGEXP_ILLEGAL_ATTR_NAME, "").toLowerCase();
+    if (name.length < 1) return;
+    var ret = onAttr(name, value || "");
+    if (ret) retAttrs.push(ret);
+  }
+
+  // 逐个分析字符
+  for (var i = 0; i < len; i++) {
+    var c = html.charAt(i);
+    var v, j;
+    if (tmpName === false && c === "=") {
+      tmpName = html.slice(lastPos, i);
+      lastPos = i + 1;
+      continue;
+    }
+    if (tmpName !== false) {
+      if (
+        i === lastPos &&
+        (c === '"' || c === "'") &&
+        html.charAt(i - 1) === "="
+      ) {
+        j = html.indexOf(c, i + 1);
+        if (j === -1) {
+          break;
+        } else {
+          v = _.trim(html.slice(lastPos + 1, j));
+          addAttr(tmpName, v);
+          tmpName = false;
+          i = j;
+          lastPos = i + 1;
+          continue;
+        }
+      }
+    }
+    if (/\s|\n|\t/.test(c)) {
+      html = html.replace(/\s|\n|\t/g, " ");
+      if (tmpName === false) {
+        j = findNextEqual(html, i);
+        if (j === -1) {
+          v = _.trim(html.slice(lastPos, i));
+          addAttr(v);
+          tmpName = false;
+          lastPos = i + 1;
+          continue;
+        } else {
+          i = j - 1;
+          continue;
+        }
+      } else {
+        j = findBeforeEqual(html, i - 1);
+        if (j === -1) {
+          v = _.trim(html.slice(lastPos, i));
+          v = stripQuoteWrap(v);
+          addAttr(tmpName, v);
+          tmpName = false;
+          lastPos = i + 1;
+          continue;
+        } else {
+          continue;
+        }
+      }
+    }
+  }
+
+  if (lastPos < html.length) {
+    if (tmpName === false) {
+      addAttr(html.slice(lastPos));
+    } else {
+      addAttr(tmpName, stripQuoteWrap(_.trim(html.slice(lastPos))));
+    }
+  }
+
+  return _.trim(retAttrs.join(" "));
+}
+
+function findNextEqual(str, i) {
+  for (; i < str.length; i++) {
+    var c = str[i];
+    if (c === " ") continue;
+    if (c === "=") return i;
+    return -1;
+  }
+}
+
+function findBeforeEqual(str, i) {
+  for (; i > 0; i--) {
+    var c = str[i];
+    if (c === " ") continue;
+    if (c === "=") return i;
+    return -1;
+  }
+}
+
+function isQuoteWrapString(text) {
+  if (
+    (text[0] === '"' && text[text.length - 1] === '"') ||
+    (text[0] === "'" && text[text.length - 1] === "'")
+  ) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
+function stripQuoteWrap(text) {
+  if (isQuoteWrapString(text)) {
+    return text.substr(1, text.length - 2);
+  } else {
+    return text;
+  }
+}
+
+exports.parseTag = parseTag;
+exports.parseAttr = parseAttr;
+
+},{"./util":4}],4:[function(require,module,exports){
+module.exports = {
+  indexOf: function(arr, item) {
+    var i, j;
+    if (Array.prototype.indexOf) {
+      return arr.indexOf(item);
+    }
+    for (i = 0, j = arr.length; i < j; i++) {
+      if (arr[i] === item) {
+        return i;
+      }
+    }
+    return -1;
+  },
+  forEach: function(arr, fn, scope) {
+    var i, j;
+    if (Array.prototype.forEach) {
+      return arr.forEach(fn, scope);
+    }
+    for (i = 0, j = arr.length; i < j; i++) {
+      fn.call(scope, arr[i], i, arr);
+    }
+  },
+  trim: function(str) {
+    if (String.prototype.trim) {
+      return str.trim();
+    }
+    return str.replace(/(^\s*)|(\s*$)/g, "");
+  },
+  spaceIndex: function(str) {
+    var reg = /\s|\n|\t/;
+    var match = reg.exec(str);
+    return match ? match.index : -1;
+  }
+};
+
+},{}],5:[function(require,module,exports){
+/**
+ * filter xss
+ *
+ * @author Zongmin Lei<leizongmin@gmail.com>
+ */
+
+var FilterCSS = require("cssfilter").FilterCSS;
+var DEFAULT = require("./default");
+var parser = require("./parser");
+var parseTag = parser.parseTag;
+var parseAttr = parser.parseAttr;
+var _ = require("./util");
+
+/**
+ * returns `true` if the input value is `undefined` or `null`
+ *
+ * @param {Object} obj
+ * @return {Boolean}
+ */
+function isNull(obj) {
+  return obj === undefined || obj === null;
+}
+
+/**
+ * get attributes for a tag
+ *
+ * @param {String} html
+ * @return {Object}
+ *   - {String} html
+ *   - {Boolean} closing
+ */
+function getAttrs(html) {
+  var i = _.spaceIndex(html);
+  if (i === -1) {
+    return {
+      html: "",
+      closing: html[html.length - 2] === "/"
+    };
+  }
+  html = _.trim(html.slice(i + 1, -1));
+  var isClosing = html[html.length - 1] === "/";
+  if (isClosing) html = _.trim(html.slice(0, -1));
+  return {
+    html: html,
+    closing: isClosing
+  };
+}
+
+/**
+ * shallow copy
+ *
+ * @param {Object} obj
+ * @return {Object}
+ */
+function shallowCopyObject(obj) {
+  var ret = {};
+  for (var i in obj) {
+    ret[i] = obj[i];
+  }
+  return ret;
+}
+
+/**
+ * FilterXSS class
+ *
+ * @param {Object} options
+ *        whiteList, onTag, onTagAttr, onIgnoreTag,
+ *        onIgnoreTagAttr, safeAttrValue, escapeHtml
+ *        stripIgnoreTagBody, allowCommentTag, stripBlankChar
+ *        css{whiteList, onAttr, onIgnoreAttr} `css=false` means don't use `cssfilter`
+ */
+function FilterXSS(options) {
+  options = shallowCopyObject(options || {});
+
+  if (options.stripIgnoreTag) {
+    if (options.onIgnoreTag) {
+      console.error(
+        'Notes: cannot use these two options "stripIgnoreTag" and "onIgnoreTag" at the same time'
+      );
+    }
+    options.onIgnoreTag = DEFAULT.onIgnoreTagStripAll;
+  }
+
+  options.whiteList = options.whiteList || DEFAULT.whiteList;
+  options.onTag = options.onTag || DEFAULT.onTag;
+  options.onTagAttr = options.onTagAttr || DEFAULT.onTagAttr;
+  options.onIgnoreTag = options.onIgnoreTag || DEFAULT.onIgnoreTag;
+  options.onIgnoreTagAttr = options.onIgnoreTagAttr || DEFAULT.onIgnoreTagAttr;
+  options.safeAttrValue = options.safeAttrValue || DEFAULT.safeAttrValue;
+  options.escapeHtml = options.escapeHtml || DEFAULT.escapeHtml;
+  this.options = options;
+
+  if (options.css === false) {
+    this.cssFilter = false;
+  } else {
+    options.css = options.css || {};
+    this.cssFilter = new FilterCSS(options.css);
+  }
+}
+
+/**
+ * start process and returns result
+ *
+ * @param {String} html
+ * @return {String}
+ */
+FilterXSS.prototype.process = function(html) {
+  // compatible with the input
+  html = html || "";
+  html = html.toString();
+  if (!html) return "";
+
+  var me = this;
+  var options = me.options;
+  var whiteList = options.whiteList;
+  var onTag = options.onTag;
+  var onIgnoreTag = options.onIgnoreTag;
+  var onTagAttr = options.onTagAttr;
+  var onIgnoreTagAttr = options.onIgnoreTagAttr;
+  var safeAttrValue = options.safeAttrValue;
+  var escapeHtml = options.escapeHtml;
+  var cssFilter = me.cssFilter;
+
+  // remove invisible characters
+  if (options.stripBlankChar) {
+    html = DEFAULT.stripBlankChar(html);
+  }
+
+  // remove html comments
+  if (!options.allowCommentTag) {
+    html = DEFAULT.stripCommentTag(html);
+  }
+
+  // if enable stripIgnoreTagBody
+  var stripIgnoreTagBody = false;
+  if (options.stripIgnoreTagBody) {
+    var stripIgnoreTagBody = DEFAULT.StripTagBody(
+      options.stripIgnoreTagBody,
+      onIgnoreTag
+    );
+    onIgnoreTag = stripIgnoreTagBody.onIgnoreTag;
+  }
+
+  var retHtml = parseTag(
+    html,
+    function(sourcePosition, position, tag, html, isClosing) {
+      var info = {
+        sourcePosition: sourcePosition,
+        position: position,
+        isClosing: isClosing,
+        isWhite: whiteList.hasOwnProperty(tag)
+      };
+
+      // call `onTag()`
+      var ret = onTag(tag, html, info);
+      if (!isNull(ret)) return ret;
+
+      if (info.isWhite) {
+        if (info.isClosing) {
+          return "</" + tag + ">";
+        }
+
+        var attrs = getAttrs(html);
+        var whiteAttrList = whiteList[tag];
+        var attrsHtml = parseAttr(attrs.html, function(name, value) {
+          // call `onTagAttr()`
+          var isWhiteAttr = _.indexOf(whiteAttrList, name) !== -1;
+          var ret = onTagAttr(tag, name, value, isWhiteAttr);
+          if (!isNull(ret)) return ret;
+
+          if (isWhiteAttr) {
+            // call `safeAttrValue()`
+            value = safeAttrValue(tag, name, value, cssFilter);
+            if (value) {
+              return name + '="' + value + '"';
+            } else {
+              return name;
+            }
+          } else {
+            // call `onIgnoreTagAttr()`
+            var ret = onIgnoreTagAttr(tag, name, value, isWhiteAttr);
+            if (!isNull(ret)) return ret;
+            return;
+          }
+        });
+
+        // build new tag html
+        var html = "<" + tag;
+        if (attrsHtml) html += " " + attrsHtml;
+        if (attrs.closing) html += " /";
+        html += ">";
+        return html;
+      } else {
+        // call `onIgnoreTag()`
+        var ret = onIgnoreTag(tag, html, info);
+        if (!isNull(ret)) return ret;
+        return escapeHtml(html);
+      }
+    },
+    escapeHtml
+  );
+
+  // if enable stripIgnoreTagBody
+  if (stripIgnoreTagBody) {
+    retHtml = stripIgnoreTagBody.remove(retHtml);
+  }
+
+  return retHtml;
+};
+
+module.exports = FilterXSS;
+
+},{"./default":1,"./parser":3,"./util":4,"cssfilter":8}],6:[function(require,module,exports){
+/**
+ * cssfilter
+ *
+ * @author 老雷<leizongmin@gmail.com>
+ */
+
+var DEFAULT = require('./default');
+var parseStyle = require('./parser');
+var _ = require('./util');
+
+
+/**
+ * 返回值是否为空
+ *
+ * @param {Object} obj
+ * @return {Boolean}
+ */
+function isNull (obj) {
+  return (obj === undefined || obj === null);
+}
+
+/**
+ * 浅拷贝对象
+ *
+ * @param {Object} obj
+ * @return {Object}
+ */
+function shallowCopyObject (obj) {
+  var ret = {};
+  for (var i in obj) {
+    ret[i] = obj[i];
+  }
+  return ret;
+}
+
+/**
+ * 创建CSS过滤器
+ *
+ * @param {Object} options
+ *   - {Object} whiteList
+ *   - {Function} onAttr
+ *   - {Function} onIgnoreAttr
+ *   - {Function} safeAttrValue
+ */
+function FilterCSS (options) {
+  options = shallowCopyObject(options || {});
+  options.whiteList = options.whiteList || DEFAULT.whiteList;
+  options.onAttr = options.onAttr || DEFAULT.onAttr;
+  options.onIgnoreAttr = options.onIgnoreAttr || DEFAULT.onIgnoreAttr;
+  options.safeAttrValue = options.safeAttrValue || DEFAULT.safeAttrValue;
+  this.options = options;
+}
+
+FilterCSS.prototype.process = function (css) {
+  // 兼容各种奇葩输入
+  css = css || '';
+  css = css.toString();
+  if (!css) return '';
+
+  var me = this;
+  var options = me.options;
+  var whiteList = options.whiteList;
+  var onAttr = options.onAttr;
+  var onIgnoreAttr = options.onIgnoreAttr;
+  var safeAttrValue = options.safeAttrValue;
+
+  var retCSS = parseStyle(css, function (sourcePosition, position, name, value, source) {
+
+    var check = whiteList[name];
+    var isWhite = false;
+    if (check === true) isWhite = check;
+    else if (typeof check === 'function') isWhite = check(value);
+    else if (check instanceof RegExp) isWhite = check.test(value);
+    if (isWhite !== true) isWhite = false;
+
+    // 如果过滤后 value 为空则直接忽略
+    value = safeAttrValue(name, value);
+    if (!value) return;
+
+    var opts = {
+      position: position,
+      sourcePosition: sourcePosition,
+      source: source,
+      isWhite: isWhite
+    };
+
+    if (isWhite) {
+
+      var ret = onAttr(name, value, opts);
+      if (isNull(ret)) {
+        return name + ':' + value;
+      } else {
+        return ret;
+      }
+
+    } else {
+
+      var ret = onIgnoreAttr(name, value, opts);
+      if (!isNull(ret)) {
+        return ret;
+      }
+
+    }
+  });
+
+  return retCSS;
+};
+
+
+module.exports = FilterCSS;
+
+},{"./default":7,"./parser":9,"./util":10}],7:[function(require,module,exports){
+/**
+ * cssfilter
+ *
+ * @author 老雷<leizongmin@gmail.com>
+ */
+
+function getDefaultWhiteList () {
+  // 白名单值说明：
+  // true: 允许该属性
+  // Function: function (val) { } 返回true表示允许该属性，其他值均表示不允许
+  // RegExp: regexp.test(val) 返回true表示允许该属性，其他值均表示不允许
+  // 除上面列出的值外均表示不允许
+  var whiteList = {};
+
+  whiteList['align-content'] = false; // default: auto
+  whiteList['align-items'] = false; // default: auto
+  whiteList['align-self'] = false; // default: auto
+  whiteList['alignment-adjust'] = false; // default: auto
+  whiteList['alignment-baseline'] = false; // default: baseline
+  whiteList['all'] = false; // default: depending on individual properties
+  whiteList['anchor-point'] = false; // default: none
+  whiteList['animation'] = false; // default: depending on individual properties
+  whiteList['animation-delay'] = false; // default: 0
+  whiteList['animation-direction'] = false; // default: normal
+  whiteList['animation-duration'] = false; // default: 0
+  whiteList['animation-fill-mode'] = false; // default: none
+  whiteList['animation-iteration-count'] = false; // default: 1
+  whiteList['animation-name'] = false; // default: none
+  whiteList['animation-play-state'] = false; // default: running
+  whiteList['animation-timing-function'] = false; // default: ease
+  whiteList['azimuth'] = false; // default: center
+  whiteList['backface-visibility'] = false; // default: visible
+  whiteList['background'] = true; // default: depending on individual properties
+  whiteList['background-attachment'] = true; // default: scroll
+  whiteList['background-clip'] = true; // default: border-box
+  whiteList['background-color'] = true; // default: transparent
+  whiteList['background-image'] = true; // default: none
+  whiteList['background-origin'] = true; // default: padding-box
+  whiteList['background-position'] = true; // default: 0% 0%
+  whiteList['background-repeat'] = true; // default: repeat
+  whiteList['background-size'] = true; // default: auto
+  whiteList['baseline-shift'] = false; // default: baseline
+  whiteList['binding'] = false; // default: none
+  whiteList['bleed'] = false; // default: 6pt
+  whiteList['bookmark-label'] = false; // default: content()
+  whiteList['bookmark-level'] = false; // default: none
+  whiteList['bookmark-state'] = false; // default: open
+  whiteList['border'] = true; // default: depending on individual properties
+  whiteList['border-bottom'] = true; // default: depending on individual properties
+  whiteList['border-bottom-color'] = true; // default: current color
+  whiteList['border-bottom-left-radius'] = true; // default: 0
+  whiteList['border-bottom-right-radius'] = true; // default: 0
+  whiteList['border-bottom-style'] = true; // default: none
+  whiteList['border-bottom-width'] = true; // default: medium
+  whiteList['border-collapse'] = true; // default: separate
+  whiteList['border-color'] = true; // default: depending on individual properties
+  whiteList['border-image'] = true; // default: none
+  whiteList['border-image-outset'] = true; // default: 0
+  whiteList['border-image-repeat'] = true; // default: stretch
+  whiteList['border-image-slice'] = true; // default: 100%
+  whiteList['border-image-source'] = true; // default: none
+  whiteList['border-image-width'] = true; // default: 1
+  whiteList['border-left'] = true; // default: depending on individual properties
+  whiteList['border-left-color'] = true; // default: current color
+  whiteList['border-left-style'] = true; // default: none
+  whiteList['border-left-width'] = true; // default: medium
+  whiteList['border-radius'] = true; // default: 0
+  whiteList['border-right'] = true; // default: depending on individual properties
+  whiteList['border-right-color'] = true; // default: current color
+  whiteList['border-right-style'] = true; // default: none
+  whiteList['border-right-width'] = true; // default: medium
+  whiteList['border-spacing'] = true; // default: 0
+  whiteList['border-style'] = true; // default: depending on individual properties
+  whiteList['border-top'] = true; // default: depending on individual properties
+  whiteList['border-top-color'] = true; // default: current color
+  whiteList['border-top-left-radius'] = true; // default: 0
+  whiteList['border-top-right-radius'] = true; // default: 0
+  whiteList['border-top-style'] = true; // default: none
+  whiteList['border-top-width'] = true; // default: medium
+  whiteList['border-width'] = true; // default: depending on individual properties
+  whiteList['bottom'] = false; // default: auto
+  whiteList['box-decoration-break'] = true; // default: slice
+  whiteList['box-shadow'] = true; // default: none
+  whiteList['box-sizing'] = true; // default: content-box
+  whiteList['box-snap'] = true; // default: none
+  whiteList['box-suppress'] = true; // default: show
+  whiteList['break-after'] = true; // default: auto
+  whiteList['break-before'] = true; // default: auto
+  whiteList['break-inside'] = true; // default: auto
+  whiteList['caption-side'] = false; // default: top
+  whiteList['chains'] = false; // default: none
+  whiteList['clear'] = true; // default: none
+  whiteList['clip'] = false; // default: auto
+  whiteList['clip-path'] = false; // default: none
+  whiteList['clip-rule'] = false; // default: nonzero
+  whiteList['color'] = true; // default: implementation dependent
+  whiteList['color-interpolation-filters'] = true; // default: auto
+  whiteList['column-count'] = false; // default: auto
+  whiteList['column-fill'] = false; // default: balance
+  whiteList['column-gap'] = false; // default: normal
+  whiteList['column-rule'] = false; // default: depending on individual properties
+  whiteList['column-rule-color'] = false; // default: current color
+  whiteList['column-rule-style'] = false; // default: medium
+  whiteList['column-rule-width'] = false; // default: medium
+  whiteList['column-span'] = false; // default: none
+  whiteList['column-width'] = false; // default: auto
+  whiteList['columns'] = false; // default: depending on individual properties
+  whiteList['contain'] = false; // default: none
+  whiteList['content'] = false; // default: normal
+  whiteList['counter-increment'] = false; // default: none
+  whiteList['counter-reset'] = false; // default: none
+  whiteList['counter-set'] = false; // default: none
+  whiteList['crop'] = false; // default: auto
+  whiteList['cue'] = false; // default: depending on individual properties
+  whiteList['cue-after'] = false; // default: none
+  whiteList['cue-before'] = false; // default: none
+  whiteList['cursor'] = false; // default: auto
+  whiteList['direction'] = false; // default: ltr
+  whiteList['display'] = true; // default: depending on individual properties
+  whiteList['display-inside'] = true; // default: auto
+  whiteList['display-list'] = true; // default: none
+  whiteList['display-outside'] = true; // default: inline-level
+  whiteList['dominant-baseline'] = false; // default: auto
+  whiteList['elevation'] = false; // default: level
+  whiteList['empty-cells'] = false; // default: show
+  whiteList['filter'] = false; // default: none
+  whiteList['flex'] = false; // default: depending on individual properties
+  whiteList['flex-basis'] = false; // default: auto
+  whiteList['flex-direction'] = false; // default: row
+  whiteList['flex-flow'] = false; // default: depending on individual properties
+  whiteList['flex-grow'] = false; // default: 0
+  whiteList['flex-shrink'] = false; // default: 1
+  whiteList['flex-wrap'] = false; // default: nowrap
+  whiteList['float'] = false; // default: none
+  whiteList['float-offset'] = false; // default: 0 0
+  whiteList['flood-color'] = false; // default: black
+  whiteList['flood-opacity'] = false; // default: 1
+  whiteList['flow-from'] = false; // default: none
+  whiteList['flow-into'] = false; // default: none
+  whiteList['font'] = true; // default: depending on individual properties
+  whiteList['font-family'] = true; // default: implementation dependent
+  whiteList['font-feature-settings'] = true; // default: normal
+  whiteList['font-kerning'] = true; // default: auto
+  whiteList['font-language-override'] = true; // default: normal
+  whiteList['font-size'] = true; // default: medium
+  whiteList['font-size-adjust'] = true; // default: none
+  whiteList['font-stretch'] = true; // default: normal
+  whiteList['font-style'] = true; // default: normal
+  whiteList['font-synthesis'] = true; // default: weight style
+  whiteList['font-variant'] = true; // default: normal
+  whiteList['font-variant-alternates'] = true; // default: normal
+  whiteList['font-variant-caps'] = true; // default: normal
+  whiteList['font-variant-east-asian'] = true; // default: normal
+  whiteList['font-variant-ligatures'] = true; // default: normal
+  whiteList['font-variant-numeric'] = true; // default: normal
+  whiteList['font-variant-position'] = true; // default: normal
+  whiteList['font-weight'] = true; // default: normal
+  whiteList['grid'] = false; // default: depending on individual properties
+  whiteList['grid-area'] = false; // default: depending on individual properties
+  whiteList['grid-auto-columns'] = false; // default: auto
+  whiteList['grid-auto-flow'] = false; // default: none
+  whiteList['grid-auto-rows'] = false; // default: auto
+  whiteList['grid-column'] = false; // default: depending on individual properties
+  whiteList['grid-column-end'] = false; // default: auto
+  whiteList['grid-column-start'] = false; // default: auto
+  whiteList['grid-row'] = false; // default: depending on individual properties
+  whiteList['grid-row-end'] = false; // default: auto
+  whiteList['grid-row-start'] = false; // default: auto
+  whiteList['grid-template'] = false; // default: depending on individual properties
+  whiteList['grid-template-areas'] = false; // default: none
+  whiteList['grid-template-columns'] = false; // default: none
+  whiteList['grid-template-rows'] = false; // default: none
+  whiteList['hanging-punctuation'] = false; // default: none
+  whiteList['height'] = true; // default: auto
+  whiteList['hyphens'] = false; // default: manual
+  whiteList['icon'] = false; // default: auto
+  whiteList['image-orientation'] = false; // default: auto
+  whiteList['image-resolution'] = false; // default: normal
+  whiteList['ime-mode'] = false; // default: auto
+  whiteList['initial-letters'] = false; // default: normal
+  whiteList['inline-box-align'] = false; // default: last
+  whiteList['justify-content'] = false; // default: auto
+  whiteList['justify-items'] = false; // default: auto
+  whiteList['justify-self'] = false; // default: auto
+  whiteList['left'] = false; // default: auto
+  whiteList['letter-spacing'] = true; // default: normal
+  whiteList['lighting-color'] = true; // default: white
+  whiteList['line-box-contain'] = false; // default: block inline replaced
+  whiteList['line-break'] = false; // default: auto
+  whiteList['line-grid'] = false; // default: match-parent
+  whiteList['line-height'] = false; // default: normal
+  whiteList['line-snap'] = false; // default: none
+  whiteList['line-stacking'] = false; // default: depending on individual properties
+  whiteList['line-stacking-ruby'] = false; // default: exclude-ruby
+  whiteList['line-stacking-shift'] = false; // default: consider-shifts
+  whiteList['line-stacking-strategy'] = false; // default: inline-line-height
+  whiteList['list-style'] = true; // default: depending on individual properties
+  whiteList['list-style-image'] = true; // default: none
+  whiteList['list-style-position'] = true; // default: outside
+  whiteList['list-style-type'] = true; // default: disc
+  whiteList['margin'] = true; // default: depending on individual properties
+  whiteList['margin-bottom'] = true; // default: 0
+  whiteList['margin-left'] = true; // default: 0
+  whiteList['margin-right'] = true; // default: 0
+  whiteList['margin-top'] = true; // default: 0
+  whiteList['marker-offset'] = false; // default: auto
+  whiteList['marker-side'] = false; // default: list-item
+  whiteList['marks'] = false; // default: none
+  whiteList['mask'] = false; // default: border-box
+  whiteList['mask-box'] = false; // default: see individual properties
+  whiteList['mask-box-outset'] = false; // default: 0
+  whiteList['mask-box-repeat'] = false; // default: stretch
+  whiteList['mask-box-slice'] = false; // default: 0 fill
+  whiteList['mask-box-source'] = false; // default: none
+  whiteList['mask-box-width'] = false; // default: auto
+  whiteList['mask-clip'] = false; // default: border-box
+  whiteList['mask-image'] = false; // default: none
+  whiteList['mask-origin'] = false; // default: border-box
+  whiteList['mask-position'] = false; // default: center
+  whiteList['mask-repeat'] = false; // default: no-repeat
+  whiteList['mask-size'] = false; // default: border-box
+  whiteList['mask-source-type'] = false; // default: auto
+  whiteList['mask-type'] = false; // default: luminance
+  whiteList['max-height'] = true; // default: none
+  whiteList['max-lines'] = false; // default: none
+  whiteList['max-width'] = true; // default: none
+  whiteList['min-height'] = true; // default: 0
+  whiteList['min-width'] = true; // default: 0
+  whiteList['move-to'] = false; // default: normal
+  whiteList['nav-down'] = false; // default: auto
+  whiteList['nav-index'] = false; // default: auto
+  whiteList['nav-left'] = false; // default: auto
+  whiteList['nav-right'] = false; // default: auto
+  whiteList['nav-up'] = false; // default: auto
+  whiteList['object-fit'] = false; // default: fill
+  whiteList['object-position'] = false; // default: 50% 50%
+  whiteList['opacity'] = false; // default: 1
+  whiteList['order'] = false; // default: 0
+  whiteList['orphans'] = false; // default: 2
+  whiteList['outline'] = false; // default: depending on individual properties
+  whiteList['outline-color'] = false; // default: invert
+  whiteList['outline-offset'] = false; // default: 0
+  whiteList['outline-style'] = false; // default: none
+  whiteList['outline-width'] = false; // default: medium
+  whiteList['overflow'] = false; // default: depending on individual properties
+  whiteList['overflow-wrap'] = false; // default: normal
+  whiteList['overflow-x'] = false; // default: visible
+  whiteList['overflow-y'] = false; // default: visible
+  whiteList['padding'] = true; // default: depending on individual properties
+  whiteList['padding-bottom'] = true; // default: 0
+  whiteList['padding-left'] = true; // default: 0
+  whiteList['padding-right'] = true; // default: 0
+  whiteList['padding-top'] = true; // default: 0
+  whiteList['page'] = false; // default: auto
+  whiteList['page-break-after'] = false; // default: auto
+  whiteList['page-break-before'] = false; // default: auto
+  whiteList['page-break-inside'] = false; // default: auto
+  whiteList['page-policy'] = false; // default: start
+  whiteList['pause'] = false; // default: implementation dependent
+  whiteList['pause-after'] = false; // default: implementation dependent
+  whiteList['pause-before'] = false; // default: implementation dependent
+  whiteList['perspective'] = false; // default: none
+  whiteList['perspective-origin'] = false; // default: 50% 50%
+  whiteList['pitch'] = false; // default: medium
+  whiteList['pitch-range'] = false; // default: 50
+  whiteList['play-during'] = false; // default: auto
+  whiteList['position'] = false; // default: static
+  whiteList['presentation-level'] = false; // default: 0
+  whiteList['quotes'] = false; // default: text
+  whiteList['region-fragment'] = false; // default: auto
+  whiteList['resize'] = false; // default: none
+  whiteList['rest'] = false; // default: depending on individual properties
+  whiteList['rest-after'] = false; // default: none
+  whiteList['rest-before'] = false; // default: none
+  whiteList['richness'] = false; // default: 50
+  whiteList['right'] = false; // default: auto
+  whiteList['rotation'] = false; // default: 0
+  whiteList['rotation-point'] = false; // default: 50% 50%
+  whiteList['ruby-align'] = false; // default: auto
+  whiteList['ruby-merge'] = false; // default: separate
+  whiteList['ruby-position'] = false; // default: before
+  whiteList['shape-image-threshold'] = false; // default: 0.0
+  whiteList['shape-outside'] = false; // default: none
+  whiteList['shape-margin'] = false; // default: 0
+  whiteList['size'] = false; // default: auto
+  whiteList['speak'] = false; // default: auto
+  whiteList['speak-as'] = false; // default: normal
+  whiteList['speak-header'] = false; // default: once
+  whiteList['speak-numeral'] = false; // default: continuous
+  whiteList['speak-punctuation'] = false; // default: none
+  whiteList['speech-rate'] = false; // default: medium
+  whiteList['stress'] = false; // default: 50
+  whiteList['string-set'] = false; // default: none
+  whiteList['tab-size'] = false; // default: 8
+  whiteList['table-layout'] = false; // default: auto
+  whiteList['text-align'] = true; // default: start
+  whiteList['text-align-last'] = true; // default: auto
+  whiteList['text-combine-upright'] = true; // default: none
+  whiteList['text-decoration'] = true; // default: none
+  whiteList['text-decoration-color'] = true; // default: currentColor
+  whiteList['text-decoration-line'] = true; // default: none
+  whiteList['text-decoration-skip'] = true; // default: objects
+  whiteList['text-decoration-style'] = true; // default: solid
+  whiteList['text-emphasis'] = true; // default: depending on individual properties
+  whiteList['text-emphasis-color'] = true; // default: currentColor
+  whiteList['text-emphasis-position'] = true; // default: over right
+  whiteList['text-emphasis-style'] = true; // default: none
+  whiteList['text-height'] = true; // default: auto
+  whiteList['text-indent'] = true; // default: 0
+  whiteList['text-justify'] = true; // default: auto
+  whiteList['text-orientation'] = true; // default: mixed
+  whiteList['text-overflow'] = true; // default: clip
+  whiteList['text-shadow'] = true; // default: none
+  whiteList['text-space-collapse'] = true; // default: collapse
+  whiteList['text-transform'] = true; // default: none
+  whiteList['text-underline-position'] = true; // default: auto
+  whiteList['text-wrap'] = true; // default: normal
+  whiteList['top'] = false; // default: auto
+  whiteList['transform'] = false; // default: none
+  whiteList['transform-origin'] = false; // default: 50% 50% 0
+  whiteList['transform-style'] = false; // default: flat
+  whiteList['transition'] = false; // default: depending on individual properties
+  whiteList['transition-delay'] = false; // default: 0s
+  whiteList['transition-duration'] = false; // default: 0s
+  whiteList['transition-property'] = false; // default: all
+  whiteList['transition-timing-function'] = false; // default: ease
+  whiteList['unicode-bidi'] = false; // default: normal
+  whiteList['vertical-align'] = false; // default: baseline
+  whiteList['visibility'] = false; // default: visible
+  whiteList['voice-balance'] = false; // default: center
+  whiteList['voice-duration'] = false; // default: auto
+  whiteList['voice-family'] = false; // default: implementation dependent
+  whiteList['voice-pitch'] = false; // default: medium
+  whiteList['voice-range'] = false; // default: medium
+  whiteList['voice-rate'] = false; // default: normal
+  whiteList['voice-stress'] = false; // default: normal
+  whiteList['voice-volume'] = false; // default: medium
+  whiteList['volume'] = false; // default: medium
+  whiteList['white-space'] = false; // default: normal
+  whiteList['widows'] = false; // default: 2
+  whiteList['width'] = true; // default: auto
+  whiteList['will-change'] = false; // default: auto
+  whiteList['word-break'] = true; // default: normal
+  whiteList['word-spacing'] = true; // default: normal
+  whiteList['word-wrap'] = true; // default: normal
+  whiteList['wrap-flow'] = false; // default: auto
+  whiteList['wrap-through'] = false; // default: wrap
+  whiteList['writing-mode'] = false; // default: horizontal-tb
+  whiteList['z-index'] = false; // default: auto
+
+  return whiteList;
+}
+
+
+/**
+ * 匹配到白名单上的一个属性时
+ *
+ * @param {String} name
+ * @param {String} value
+ * @param {Object} options
+ * @return {String}
+ */
+function onAttr (name, value, options) {
+  // do nothing
+}
+
+/**
+ * 匹配到不在白名单上的一个属性时
+ *
+ * @param {String} name
+ * @param {String} value
+ * @param {Object} options
+ * @return {String}
+ */
+function onIgnoreAttr (name, value, options) {
+  // do nothing
+}
+
+var REGEXP_URL_JAVASCRIPT = /javascript\s*\:/img;
+
+/**
+ * 过滤属性值
+ *
+ * @param {String} name
+ * @param {String} value
+ * @return {String}
+ */
+function safeAttrValue(name, value) {
+  if (REGEXP_URL_JAVASCRIPT.test(value)) return '';
+  return value;
+}
+
+
+exports.whiteList = getDefaultWhiteList();
+exports.getDefaultWhiteList = getDefaultWhiteList;
+exports.onAttr = onAttr;
+exports.onIgnoreAttr = onIgnoreAttr;
+exports.safeAttrValue = safeAttrValue;
+
+},{}],8:[function(require,module,exports){
+/**
+ * cssfilter
+ *
+ * @author 老雷<leizongmin@gmail.com>
+ */
+
+var DEFAULT = require('./default');
+var FilterCSS = require('./css');
+
+
+/**
+ * XSS过滤
+ *
+ * @param {String} css 要过滤的CSS代码
+ * @param {Object} options 选项：whiteList, onAttr, onIgnoreAttr
+ * @return {String}
+ */
+function filterCSS (html, options) {
+  var xss = new FilterCSS(options);
+  return xss.process(html);
+}
+
+
+// 输出
+exports = module.exports = filterCSS;
+exports.FilterCSS = FilterCSS;
+for (var i in DEFAULT) exports[i] = DEFAULT[i];
+
+// 在浏览器端使用
+if (typeof window !== 'undefined') {
+  window.filterCSS = module.exports;
+}
+
+},{"./css":6,"./default":7}],9:[function(require,module,exports){
+/**
+ * cssfilter
+ *
+ * @author 老雷<leizongmin@gmail.com>
+ */
+
+var _ = require('./util');
+
+
+/**
+ * 解析style
+ *
+ * @param {String} css
+ * @param {Function} onAttr 处理属性的函数
+ *   参数格式： function (sourcePosition, position, name, value, source)
+ * @return {String}
+ */
+function parseStyle (css, onAttr) {
+  css = _.trimRight(css);
+  if (css[css.length - 1] !== ';') css += ';';
+  var cssLength = css.length;
+  var isParenthesisOpen = false;
+  var lastPos = 0;
+  var i = 0;
+  var retCSS = '';
+
+  function addNewAttr () {
+    // 如果没有正常的闭合圆括号，则直接忽略当前属性
+    if (!isParenthesisOpen) {
+      var source = _.trim(css.slice(lastPos, i));
+      var j = source.indexOf(':');
+      if (j !== -1) {
+        var name = _.trim(source.slice(0, j));
+        var value = _.trim(source.slice(j + 1));
+        // 必须有属性名称
+        if (name) {
+          var ret = onAttr(lastPos, retCSS.length, name, value, source);
+          if (ret) retCSS += ret + '; ';
+        }
+      }
+    }
+    lastPos = i + 1;
+  }
+
+  for (; i < cssLength; i++) {
+    var c = css[i];
+    if (c === '/' && css[i + 1] === '*') {
+      // 备注开始
+      var j = css.indexOf('*/', i + 2);
+      // 如果没有正常的备注结束，则后面的部分全部跳过
+      if (j === -1) break;
+      // 直接将当前位置调到备注结尾，并且初始化状态
+      i = j + 1;
+      lastPos = i + 1;
+      isParenthesisOpen = false;
+    } else if (c === '(') {
+      isParenthesisOpen = true;
+    } else if (c === ')') {
+      isParenthesisOpen = false;
+    } else if (c === ';') {
+      if (isParenthesisOpen) {
+        // 在圆括号里面，忽略
+      } else {
+        addNewAttr();
+      }
+    } else if (c === '\n') {
+      addNewAttr();
+    }
+  }
+
+  return _.trim(retCSS);
+}
+
+module.exports = parseStyle;
+
+},{"./util":10}],10:[function(require,module,exports){
+module.exports = {
+  indexOf: function (arr, item) {
+    var i, j;
+    if (Array.prototype.indexOf) {
+      return arr.indexOf(item);
+    }
+    for (i = 0, j = arr.length; i < j; i++) {
+      if (arr[i] === item) {
+        return i;
+      }
+    }
+    return -1;
+  },
+  forEach: function (arr, fn, scope) {
+    var i, j;
+    if (Array.prototype.forEach) {
+      return arr.forEach(fn, scope);
+    }
+    for (i = 0, j = arr.length; i < j; i++) {
+      fn.call(scope, arr[i], i, arr);
+    }
+  },
+  trim: function (str) {
+    if (String.prototype.trim) {
+      return str.trim();
+    }
+    return str.replace(/(^\s*)|(\s*$)/g, '');
+  },
+  trimRight: function (str) {
+    if (String.prototype.trimRight) {
+      return str.trimRight();
+    }
+    return str.replace(/(\s*$)/g, '');
+  }
+};
+
+},{}]},{},[2]);
diff --git a/node_modules/xss/dist/xss.min.js b/node_modules/xss/dist/xss.min.js
new file mode 100644
index 0000000..b2c3878
--- /dev/null
+++ b/node_modules/xss/dist/xss.min.js
@@ -0,0 +1 @@
+(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){var FilterCSS=require("cssfilter").FilterCSS;var getDefaultCSSWhiteList=require("cssfilter").getDefaultWhiteList;var _=require("./util");function getDefaultWhiteList(){return{a:["target","href","title"],abbr:["title"],address:[],area:["shape","coords","href","alt"],article:[],aside:[],audio:["autoplay","controls","loop","preload","src"],b:[],bdi:["dir"],bdo:["dir"],big:[],blockquote:["cite"],br:[],caption:[],center:[],cite:[],code:[],col:["align","valign","span","width"],colgroup:["align","valign","span","width"],dd:[],del:["datetime"],details:["open"],div:[],dl:[],dt:[],em:[],font:["color","size","face"],footer:[],h1:[],h2:[],h3:[],h4:[],h5:[],h6:[],header:[],hr:[],i:[],img:["src","alt","title","width","height"],ins:["datetime"],li:[],mark:[],nav:[],ol:[],p:[],pre:[],s:[],section:[],small:[],span:[],sub:[],sup:[],strong:[],table:["width","border","align","valign"],tbody:["align","valign"],td:["width","rowspan","colspan","align","valign"],tfoot:["align","valign"],th:["width","rowspan","colspan","align","valign"],thead:["align","valign"],tr:["rowspan","align","valign"],tt:[],u:[],ul:[],video:["autoplay","controls","loop","preload","src","height","width"]}}var defaultCSSFilter=new FilterCSS;function onTag(tag,html,options){}function onIgnoreTag(tag,html,options){}function onTagAttr(tag,name,value){}function onIgnoreTagAttr(tag,name,value){}function escapeHtml(html){return html.replace(REGEXP_LT,"&lt;").replace(REGEXP_GT,"&gt;")}function safeAttrValue(tag,name,value,cssFilter){value=friendlyAttrValue(value);if(name==="href"||name==="src"){value=_.trim(value);if(value==="#")return"#";if(!(value.substr(0,7)==="http://"||value.substr(0,8)==="https://"||value.substr(0,7)==="mailto:"||value.substr(0,4)==="tel:"||value[0]==="#"||value[0]==="/")){return""}}else if(name==="background"){REGEXP_DEFAULT_ON_TAG_ATTR_4.lastIndex=0;if(REGEXP_DEFAULT_ON_TAG_ATTR_4.test(value)){return""}}else if(name==="style"){REGEXP_DEFAULT_ON_TAG_ATTR_7.lastIndex=0;if(REGEXP_DEFAULT_ON_TAG_ATTR_7.test(value)){return""}REGEXP_DEFAULT_ON_TAG_ATTR_8.lastIndex=0;if(REGEXP_DEFAULT_ON_TAG_ATTR_8.test(value)){REGEXP_DEFAULT_ON_TAG_ATTR_4.lastIndex=0;if(REGEXP_DEFAULT_ON_TAG_ATTR_4.test(value)){return""}}if(cssFilter!==false){cssFilter=cssFilter||defaultCSSFilter;value=cssFilter.process(value)}}value=escapeAttrValue(value);return value}var REGEXP_LT=/</g;var REGEXP_GT=/>/g;var REGEXP_QUOTE=/"/g;var REGEXP_QUOTE_2=/&quot;/g;var REGEXP_ATTR_VALUE_1=/&#([a-zA-Z0-9]*);?/gim;var REGEXP_ATTR_VALUE_COLON=/&colon;?/gim;var REGEXP_ATTR_VALUE_NEWLINE=/&newline;?/gim;var REGEXP_DEFAULT_ON_TAG_ATTR_3=/\/\*|\*\//gm;var REGEXP_DEFAULT_ON_TAG_ATTR_4=/((j\s*a\s*v\s*a|v\s*b|l\s*i\s*v\s*e)\s*s\s*c\s*r\s*i\s*p\s*t\s*|m\s*o\s*c\s*h\s*a)\:/gi;var REGEXP_DEFAULT_ON_TAG_ATTR_5=/^[\s"'`]*(d\s*a\s*t\s*a\s*)\:/gi;var REGEXP_DEFAULT_ON_TAG_ATTR_6=/^[\s"'`]*(d\s*a\s*t\s*a\s*)\:\s*image\//gi;var REGEXP_DEFAULT_ON_TAG_ATTR_7=/e\s*x\s*p\s*r\s*e\s*s\s*s\s*i\s*o\s*n\s*\(.*/gi;var REGEXP_DEFAULT_ON_TAG_ATTR_8=/u\s*r\s*l\s*\(.*/gi;function escapeQuote(str){return str.replace(REGEXP_QUOTE,"&quot;")}function unescapeQuote(str){return str.replace(REGEXP_QUOTE_2,'"')}function escapeHtmlEntities(str){return str.replace(REGEXP_ATTR_VALUE_1,function replaceUnicode(str,code){return code[0]==="x"||code[0]==="X"?String.fromCharCode(parseInt(code.substr(1),16)):String.fromCharCode(parseInt(code,10))})}function escapeDangerHtml5Entities(str){return str.replace(REGEXP_ATTR_VALUE_COLON,":").replace(REGEXP_ATTR_VALUE_NEWLINE," ")}function clearNonPrintableCharacter(str){var str2="";for(var i=0,len=str.length;i<len;i++){str2+=str.charCodeAt(i)<32?" ":str.charAt(i)}return _.trim(str2)}function friendlyAttrValue(str){str=unescapeQuote(str);str=escapeHtmlEntities(str);str=escapeDangerHtml5Entities(str);str=clearNonPrintableCharacter(str);return str}function escapeAttrValue(str){str=escapeQuote(str);str=escapeHtml(str);return str}function onIgnoreTagStripAll(){return""}function StripTagBody(tags,next){if(typeof next!=="function"){next=function(){}}var isRemoveAllTag=!Array.isArray(tags);function isRemoveTag(tag){if(isRemoveAllTag)return true;return _.indexOf(tags,tag)!==-1}var removeList=[];var posStart=false;return{onIgnoreTag:function(tag,html,options){if(isRemoveTag(tag)){if(options.isClosing){var ret="[/removed]";var end=options.position+ret.length;removeList.push([posStart!==false?posStart:options.position,end]);posStart=false;return ret}else{if(!posStart){posStart=options.position}return"[removed]"}}else{return next(tag,html,options)}},remove:function(html){var rethtml="";var lastPos=0;_.forEach(removeList,function(pos){rethtml+=html.slice(lastPos,pos[0]);lastPos=pos[1]});rethtml+=html.slice(lastPos);return rethtml}}}function stripCommentTag(html){return html.replace(STRIP_COMMENT_TAG_REGEXP,"")}var STRIP_COMMENT_TAG_REGEXP=/<!--[\s\S]*?-->/g;function stripBlankChar(html){var chars=html.split("");chars=chars.filter(function(char){var c=char.charCodeAt(0);if(c===127)return false;if(c<=31){if(c===10||c===13)return true;return false}return true});return chars.join("")}exports.whiteList=getDefaultWhiteList();exports.getDefaultWhiteList=getDefaultWhiteList;exports.onTag=onTag;exports.onIgnoreTag=onIgnoreTag;exports.onTagAttr=onTagAttr;exports.onIgnoreTagAttr=onIgnoreTagAttr;exports.safeAttrValue=safeAttrValue;exports.escapeHtml=escapeHtml;exports.escapeQuote=escapeQuote;exports.unescapeQuote=unescapeQuote;exports.escapeHtmlEntities=escapeHtmlEntities;exports.escapeDangerHtml5Entities=escapeDangerHtml5Entities;exports.clearNonPrintableCharacter=clearNonPrintableCharacter;exports.friendlyAttrValue=friendlyAttrValue;exports.escapeAttrValue=escapeAttrValue;exports.onIgnoreTagStripAll=onIgnoreTagStripAll;exports.StripTagBody=StripTagBody;exports.stripCommentTag=stripCommentTag;exports.stripBlankChar=stripBlankChar;exports.cssFilter=defaultCSSFilter;exports.getDefaultCSSWhiteList=getDefaultCSSWhiteList},{"./util":4,cssfilter:8}],2:[function(require,module,exports){var DEFAULT=require("./default");var parser=require("./parser");var FilterXSS=require("./xss");function filterXSS(html,options){var xss=new FilterXSS(options);return xss.process(html)}exports=module.exports=filterXSS;exports.filterXSS=filterXSS;exports.FilterXSS=FilterXSS;for(var i in DEFAULT)exports[i]=DEFAULT[i];for(var i in parser)exports[i]=parser[i];if(typeof window!=="undefined"){window.filterXSS=module.exports}function isWorkerEnv(){return typeof self!=="undefined"&&typeof DedicatedWorkerGlobalScope!=="undefined"&&self instanceof DedicatedWorkerGlobalScope}if(isWorkerEnv()){self.filterXSS=module.exports}},{"./default":1,"./parser":3,"./xss":5}],3:[function(require,module,exports){var _=require("./util");function getTagName(html){var i=_.spaceIndex(html);if(i===-1){var tagName=html.slice(1,-1)}else{var tagName=html.slice(1,i+1)}tagName=_.trim(tagName).toLowerCase();if(tagName.slice(0,1)==="/")tagName=tagName.slice(1);if(tagName.slice(-1)==="/")tagName=tagName.slice(0,-1);return tagName}function isClosing(html){return html.slice(0,2)==="</"}function parseTag(html,onTag,escapeHtml){"user strict";var rethtml="";var lastPos=0;var tagStart=false;var quoteStart=false;var currentPos=0;var len=html.length;var currentTagName="";var currentHtml="";for(currentPos=0;currentPos<len;currentPos++){var c=html.charAt(currentPos);if(tagStart===false){if(c==="<"){tagStart=currentPos;continue}}else{if(quoteStart===false){if(c==="<"){rethtml+=escapeHtml(html.slice(lastPos,currentPos));tagStart=currentPos;lastPos=currentPos;continue}if(c===">"){rethtml+=escapeHtml(html.slice(lastPos,tagStart));currentHtml=html.slice(tagStart,currentPos+1);currentTagName=getTagName(currentHtml);rethtml+=onTag(tagStart,rethtml.length,currentTagName,currentHtml,isClosing(currentHtml));lastPos=currentPos+1;tagStart=false;continue}if((c==='"'||c==="'")&&html.charAt(currentPos-1)==="="){quoteStart=c;continue}}else{if(c===quoteStart){quoteStart=false;continue}}}}if(lastPos<html.length){rethtml+=escapeHtml(html.substr(lastPos))}return rethtml}var REGEXP_ILLEGAL_ATTR_NAME=/[^a-zA-Z0-9_:\.\-]/gim;function parseAttr(html,onAttr){"user strict";var lastPos=0;var retAttrs=[];var tmpName=false;var len=html.length;function addAttr(name,value){name=_.trim(name);name=name.replace(REGEXP_ILLEGAL_ATTR_NAME,"").toLowerCase();if(name.length<1)return;var ret=onAttr(name,value||"");if(ret)retAttrs.push(ret)}for(var i=0;i<len;i++){var c=html.charAt(i);var v,j;if(tmpName===false&&c==="="){tmpName=html.slice(lastPos,i);lastPos=i+1;continue}if(tmpName!==false){if(i===lastPos&&(c==='"'||c==="'")&&html.charAt(i-1)==="="){j=html.indexOf(c,i+1);if(j===-1){break}else{v=_.trim(html.slice(lastPos+1,j));addAttr(tmpName,v);tmpName=false;i=j;lastPos=i+1;continue}}}if(/\s|\n|\t/.test(c)){html=html.replace(/\s|\n|\t/g," ");if(tmpName===false){j=findNextEqual(html,i);if(j===-1){v=_.trim(html.slice(lastPos,i));addAttr(v);tmpName=false;lastPos=i+1;continue}else{i=j-1;continue}}else{j=findBeforeEqual(html,i-1);if(j===-1){v=_.trim(html.slice(lastPos,i));v=stripQuoteWrap(v);addAttr(tmpName,v);tmpName=false;lastPos=i+1;continue}else{continue}}}}if(lastPos<html.length){if(tmpName===false){addAttr(html.slice(lastPos))}else{addAttr(tmpName,stripQuoteWrap(_.trim(html.slice(lastPos))))}}return _.trim(retAttrs.join(" "))}function findNextEqual(str,i){for(;i<str.length;i++){var c=str[i];if(c===" ")continue;if(c==="=")return i;return-1}}function findBeforeEqual(str,i){for(;i>0;i--){var c=str[i];if(c===" ")continue;if(c==="=")return i;return-1}}function isQuoteWrapString(text){if(text[0]==='"'&&text[text.length-1]==='"'||text[0]==="'"&&text[text.length-1]==="'"){return true}else{return false}}function stripQuoteWrap(text){if(isQuoteWrapString(text)){return text.substr(1,text.length-2)}else{return text}}exports.parseTag=parseTag;exports.parseAttr=parseAttr},{"./util":4}],4:[function(require,module,exports){module.exports={indexOf:function(arr,item){var i,j;if(Array.prototype.indexOf){return arr.indexOf(item)}for(i=0,j=arr.length;i<j;i++){if(arr[i]===item){return i}}return-1},forEach:function(arr,fn,scope){var i,j;if(Array.prototype.forEach){return arr.forEach(fn,scope)}for(i=0,j=arr.length;i<j;i++){fn.call(scope,arr[i],i,arr)}},trim:function(str){if(String.prototype.trim){return str.trim()}return str.replace(/(^\s*)|(\s*$)/g,"")},spaceIndex:function(str){var reg=/\s|\n|\t/;var match=reg.exec(str);return match?match.index:-1}}},{}],5:[function(require,module,exports){var FilterCSS=require("cssfilter").FilterCSS;var DEFAULT=require("./default");var parser=require("./parser");var parseTag=parser.parseTag;var parseAttr=parser.parseAttr;var _=require("./util");function isNull(obj){return obj===undefined||obj===null}function getAttrs(html){var i=_.spaceIndex(html);if(i===-1){return{html:"",closing:html[html.length-2]==="/"}}html=_.trim(html.slice(i+1,-1));var isClosing=html[html.length-1]==="/";if(isClosing)html=_.trim(html.slice(0,-1));return{html:html,closing:isClosing}}function shallowCopyObject(obj){var ret={};for(var i in obj){ret[i]=obj[i]}return ret}function FilterXSS(options){options=shallowCopyObject(options||{});if(options.stripIgnoreTag){if(options.onIgnoreTag){console.error('Notes: cannot use these two options "stripIgnoreTag" and "onIgnoreTag" at the same time')}options.onIgnoreTag=DEFAULT.onIgnoreTagStripAll}options.whiteList=options.whiteList||DEFAULT.whiteList;options.onTag=options.onTag||DEFAULT.onTag;options.onTagAttr=options.onTagAttr||DEFAULT.onTagAttr;options.onIgnoreTag=options.onIgnoreTag||DEFAULT.onIgnoreTag;options.onIgnoreTagAttr=options.onIgnoreTagAttr||DEFAULT.onIgnoreTagAttr;options.safeAttrValue=options.safeAttrValue||DEFAULT.safeAttrValue;options.escapeHtml=options.escapeHtml||DEFAULT.escapeHtml;this.options=options;if(options.css===false){this.cssFilter=false}else{options.css=options.css||{};this.cssFilter=new FilterCSS(options.css)}}FilterXSS.prototype.process=function(html){html=html||"";html=html.toString();if(!html)return"";var me=this;var options=me.options;var whiteList=options.whiteList;var onTag=options.onTag;var onIgnoreTag=options.onIgnoreTag;var onTagAttr=options.onTagAttr;var onIgnoreTagAttr=options.onIgnoreTagAttr;var safeAttrValue=options.safeAttrValue;var escapeHtml=options.escapeHtml;var cssFilter=me.cssFilter;if(options.stripBlankChar){html=DEFAULT.stripBlankChar(html)}if(!options.allowCommentTag){html=DEFAULT.stripCommentTag(html)}var stripIgnoreTagBody=false;if(options.stripIgnoreTagBody){var stripIgnoreTagBody=DEFAULT.StripTagBody(options.stripIgnoreTagBody,onIgnoreTag);onIgnoreTag=stripIgnoreTagBody.onIgnoreTag}var retHtml=parseTag(html,function(sourcePosition,position,tag,html,isClosing){var info={sourcePosition:sourcePosition,position:position,isClosing:isClosing,isWhite:whiteList.hasOwnProperty(tag)};var ret=onTag(tag,html,info);if(!isNull(ret))return ret;if(info.isWhite){if(info.isClosing){return"</"+tag+">"}var attrs=getAttrs(html);var whiteAttrList=whiteList[tag];var attrsHtml=parseAttr(attrs.html,function(name,value){var isWhiteAttr=_.indexOf(whiteAttrList,name)!==-1;var ret=onTagAttr(tag,name,value,isWhiteAttr);if(!isNull(ret))return ret;if(isWhiteAttr){value=safeAttrValue(tag,name,value,cssFilter);if(value){return name+'="'+value+'"'}else{return name}}else{var ret=onIgnoreTagAttr(tag,name,value,isWhiteAttr);if(!isNull(ret))return ret;return}});var html="<"+tag;if(attrsHtml)html+=" "+attrsHtml;if(attrs.closing)html+=" /";html+=">";return html}else{var ret=onIgnoreTag(tag,html,info);if(!isNull(ret))return ret;return escapeHtml(html)}},escapeHtml);if(stripIgnoreTagBody){retHtml=stripIgnoreTagBody.remove(retHtml)}return retHtml};module.exports=FilterXSS},{"./default":1,"./parser":3,"./util":4,cssfilter:8}],6:[function(require,module,exports){var DEFAULT=require("./default");var parseStyle=require("./parser");var _=require("./util");function isNull(obj){return obj===undefined||obj===null}function shallowCopyObject(obj){var ret={};for(var i in obj){ret[i]=obj[i]}return ret}function FilterCSS(options){options=shallowCopyObject(options||{});options.whiteList=options.whiteList||DEFAULT.whiteList;options.onAttr=options.onAttr||DEFAULT.onAttr;options.onIgnoreAttr=options.onIgnoreAttr||DEFAULT.onIgnoreAttr;options.safeAttrValue=options.safeAttrValue||DEFAULT.safeAttrValue;this.options=options}FilterCSS.prototype.process=function(css){css=css||"";css=css.toString();if(!css)return"";var me=this;var options=me.options;var whiteList=options.whiteList;var onAttr=options.onAttr;var onIgnoreAttr=options.onIgnoreAttr;var safeAttrValue=options.safeAttrValue;var retCSS=parseStyle(css,function(sourcePosition,position,name,value,source){var check=whiteList[name];var isWhite=false;if(check===true)isWhite=check;else if(typeof check==="function")isWhite=check(value);else if(check instanceof RegExp)isWhite=check.test(value);if(isWhite!==true)isWhite=false;value=safeAttrValue(name,value);if(!value)return;var opts={position:position,sourcePosition:sourcePosition,source:source,isWhite:isWhite};if(isWhite){var ret=onAttr(name,value,opts);if(isNull(ret)){return name+":"+value}else{return ret}}else{var ret=onIgnoreAttr(name,value,opts);if(!isNull(ret)){return ret}}});return retCSS};module.exports=FilterCSS},{"./default":7,"./parser":9,"./util":10}],7:[function(require,module,exports){function getDefaultWhiteList(){var whiteList={};whiteList["align-content"]=false;whiteList["align-items"]=false;whiteList["align-self"]=false;whiteList["alignment-adjust"]=false;whiteList["alignment-baseline"]=false;whiteList["all"]=false;whiteList["anchor-point"]=false;whiteList["animation"]=false;whiteList["animation-delay"]=false;whiteList["animation-direction"]=false;whiteList["animation-duration"]=false;whiteList["animation-fill-mode"]=false;whiteList["animation-iteration-count"]=false;whiteList["animation-name"]=false;whiteList["animation-play-state"]=false;whiteList["animation-timing-function"]=false;whiteList["azimuth"]=false;whiteList["backface-visibility"]=false;whiteList["background"]=true;whiteList["background-attachment"]=true;whiteList["background-clip"]=true;whiteList["background-color"]=true;whiteList["background-image"]=true;whiteList["background-origin"]=true;whiteList["background-position"]=true;whiteList["background-repeat"]=true;whiteList["background-size"]=true;whiteList["baseline-shift"]=false;whiteList["binding"]=false;whiteList["bleed"]=false;whiteList["bookmark-label"]=false;whiteList["bookmark-level"]=false;whiteList["bookmark-state"]=false;whiteList["border"]=true;whiteList["border-bottom"]=true;whiteList["border-bottom-color"]=true;whiteList["border-bottom-left-radius"]=true;whiteList["border-bottom-right-radius"]=true;whiteList["border-bottom-style"]=true;whiteList["border-bottom-width"]=true;whiteList["border-collapse"]=true;whiteList["border-color"]=true;whiteList["border-image"]=true;whiteList["border-image-outset"]=true;whiteList["border-image-repeat"]=true;whiteList["border-image-slice"]=true;whiteList["border-image-source"]=true;whiteList["border-image-width"]=true;whiteList["border-left"]=true;whiteList["border-left-color"]=true;whiteList["border-left-style"]=true;whiteList["border-left-width"]=true;whiteList["border-radius"]=true;whiteList["border-right"]=true;whiteList["border-right-color"]=true;whiteList["border-right-style"]=true;whiteList["border-right-width"]=true;whiteList["border-spacing"]=true;whiteList["border-style"]=true;whiteList["border-top"]=true;whiteList["border-top-color"]=true;whiteList["border-top-left-radius"]=true;whiteList["border-top-right-radius"]=true;whiteList["border-top-style"]=true;whiteList["border-top-width"]=true;whiteList["border-width"]=true;whiteList["bottom"]=false;whiteList["box-decoration-break"]=true;whiteList["box-shadow"]=true;whiteList["box-sizing"]=true;whiteList["box-snap"]=true;whiteList["box-suppress"]=true;whiteList["break-after"]=true;whiteList["break-before"]=true;whiteList["break-inside"]=true;whiteList["caption-side"]=false;whiteList["chains"]=false;whiteList["clear"]=true;whiteList["clip"]=false;whiteList["clip-path"]=false;whiteList["clip-rule"]=false;whiteList["color"]=true;whiteList["color-interpolation-filters"]=true;whiteList["column-count"]=false;whiteList["column-fill"]=false;whiteList["column-gap"]=false;whiteList["column-rule"]=false;whiteList["column-rule-color"]=false;whiteList["column-rule-style"]=false;whiteList["column-rule-width"]=false;whiteList["column-span"]=false;whiteList["column-width"]=false;whiteList["columns"]=false;whiteList["contain"]=false;whiteList["content"]=false;whiteList["counter-increment"]=false;whiteList["counter-reset"]=false;whiteList["counter-set"]=false;whiteList["crop"]=false;whiteList["cue"]=false;whiteList["cue-after"]=false;whiteList["cue-before"]=false;whiteList["cursor"]=false;whiteList["direction"]=false;whiteList["display"]=true;whiteList["display-inside"]=true;whiteList["display-list"]=true;whiteList["display-outside"]=true;whiteList["dominant-baseline"]=false;whiteList["elevation"]=false;whiteList["empty-cells"]=false;whiteList["filter"]=false;whiteList["flex"]=false;whiteList["flex-basis"]=false;whiteList["flex-direction"]=false;whiteList["flex-flow"]=false;whiteList["flex-grow"]=false;whiteList["flex-shrink"]=false;whiteList["flex-wrap"]=false;whiteList["float"]=false;whiteList["float-offset"]=false;whiteList["flood-color"]=false;whiteList["flood-opacity"]=false;whiteList["flow-from"]=false;whiteList["flow-into"]=false;whiteList["font"]=true;whiteList["font-family"]=true;whiteList["font-feature-settings"]=true;whiteList["font-kerning"]=true;whiteList["font-language-override"]=true;whiteList["font-size"]=true;whiteList["font-size-adjust"]=true;whiteList["font-stretch"]=true;whiteList["font-style"]=true;whiteList["font-synthesis"]=true;whiteList["font-variant"]=true;whiteList["font-variant-alternates"]=true;whiteList["font-variant-caps"]=true;whiteList["font-variant-east-asian"]=true;whiteList["font-variant-ligatures"]=true;whiteList["font-variant-numeric"]=true;whiteList["font-variant-position"]=true;whiteList["font-weight"]=true;whiteList["grid"]=false;whiteList["grid-area"]=false;whiteList["grid-auto-columns"]=false;whiteList["grid-auto-flow"]=false;whiteList["grid-auto-rows"]=false;whiteList["grid-column"]=false;whiteList["grid-column-end"]=false;whiteList["grid-column-start"]=false;whiteList["grid-row"]=false;whiteList["grid-row-end"]=false;whiteList["grid-row-start"]=false;whiteList["grid-template"]=false;whiteList["grid-template-areas"]=false;whiteList["grid-template-columns"]=false;whiteList["grid-template-rows"]=false;whiteList["hanging-punctuation"]=false;whiteList["height"]=true;whiteList["hyphens"]=false;whiteList["icon"]=false;whiteList["image-orientation"]=false;whiteList["image-resolution"]=false;whiteList["ime-mode"]=false;whiteList["initial-letters"]=false;whiteList["inline-box-align"]=false;whiteList["justify-content"]=false;whiteList["justify-items"]=false;whiteList["justify-self"]=false;whiteList["left"]=false;whiteList["letter-spacing"]=true;whiteList["lighting-color"]=true;whiteList["line-box-contain"]=false;whiteList["line-break"]=false;whiteList["line-grid"]=false;whiteList["line-height"]=false;whiteList["line-snap"]=false;whiteList["line-stacking"]=false;whiteList["line-stacking-ruby"]=false;whiteList["line-stacking-shift"]=false;whiteList["line-stacking-strategy"]=false;whiteList["list-style"]=true;whiteList["list-style-image"]=true;whiteList["list-style-position"]=true;whiteList["list-style-type"]=true;whiteList["margin"]=true;whiteList["margin-bottom"]=true;whiteList["margin-left"]=true;whiteList["margin-right"]=true;whiteList["margin-top"]=true;whiteList["marker-offset"]=false;whiteList["marker-side"]=false;whiteList["marks"]=false;whiteList["mask"]=false;whiteList["mask-box"]=false;whiteList["mask-box-outset"]=false;whiteList["mask-box-repeat"]=false;whiteList["mask-box-slice"]=false;whiteList["mask-box-source"]=false;whiteList["mask-box-width"]=false;whiteList["mask-clip"]=false;whiteList["mask-image"]=false;whiteList["mask-origin"]=false;whiteList["mask-position"]=false;whiteList["mask-repeat"]=false;whiteList["mask-size"]=false;whiteList["mask-source-type"]=false;whiteList["mask-type"]=false;whiteList["max-height"]=true;whiteList["max-lines"]=false;whiteList["max-width"]=true;whiteList["min-height"]=true;whiteList["min-width"]=true;whiteList["move-to"]=false;whiteList["nav-down"]=false;whiteList["nav-index"]=false;whiteList["nav-left"]=false;whiteList["nav-right"]=false;whiteList["nav-up"]=false;whiteList["object-fit"]=false;whiteList["object-position"]=false;whiteList["opacity"]=false;whiteList["order"]=false;whiteList["orphans"]=false;whiteList["outline"]=false;whiteList["outline-color"]=false;whiteList["outline-offset"]=false;whiteList["outline-style"]=false;whiteList["outline-width"]=false;whiteList["overflow"]=false;whiteList["overflow-wrap"]=false;whiteList["overflow-x"]=false;whiteList["overflow-y"]=false;whiteList["padding"]=true;whiteList["padding-bottom"]=true;whiteList["padding-left"]=true;whiteList["padding-right"]=true;whiteList["padding-top"]=true;whiteList["page"]=false;whiteList["page-break-after"]=false;whiteList["page-break-before"]=false;whiteList["page-break-inside"]=false;whiteList["page-policy"]=false;whiteList["pause"]=false;whiteList["pause-after"]=false;whiteList["pause-before"]=false;whiteList["perspective"]=false;whiteList["perspective-origin"]=false;whiteList["pitch"]=false;whiteList["pitch-range"]=false;whiteList["play-during"]=false;whiteList["position"]=false;whiteList["presentation-level"]=false;whiteList["quotes"]=false;whiteList["region-fragment"]=false;whiteList["resize"]=false;whiteList["rest"]=false;whiteList["rest-after"]=false;whiteList["rest-before"]=false;whiteList["richness"]=false;whiteList["right"]=false;whiteList["rotation"]=false;whiteList["rotation-point"]=false;whiteList["ruby-align"]=false;whiteList["ruby-merge"]=false;whiteList["ruby-position"]=false;whiteList["shape-image-threshold"]=false;whiteList["shape-outside"]=false;whiteList["shape-margin"]=false;whiteList["size"]=false;whiteList["speak"]=false;whiteList["speak-as"]=false;whiteList["speak-header"]=false;whiteList["speak-numeral"]=false;whiteList["speak-punctuation"]=false;whiteList["speech-rate"]=false;whiteList["stress"]=false;whiteList["string-set"]=false;whiteList["tab-size"]=false;whiteList["table-layout"]=false;whiteList["text-align"]=true;whiteList["text-align-last"]=true;whiteList["text-combine-upright"]=true;whiteList["text-decoration"]=true;whiteList["text-decoration-color"]=true;whiteList["text-decoration-line"]=true;whiteList["text-decoration-skip"]=true;whiteList["text-decoration-style"]=true;whiteList["text-emphasis"]=true;whiteList["text-emphasis-color"]=true;whiteList["text-emphasis-position"]=true;whiteList["text-emphasis-style"]=true;whiteList["text-height"]=true;whiteList["text-indent"]=true;whiteList["text-justify"]=true;whiteList["text-orientation"]=true;whiteList["text-overflow"]=true;whiteList["text-shadow"]=true;whiteList["text-space-collapse"]=true;whiteList["text-transform"]=true;whiteList["text-underline-position"]=true;whiteList["text-wrap"]=true;whiteList["top"]=false;whiteList["transform"]=false;whiteList["transform-origin"]=false;whiteList["transform-style"]=false;whiteList["transition"]=false;whiteList["transition-delay"]=false;whiteList["transition-duration"]=false;whiteList["transition-property"]=false;whiteList["transition-timing-function"]=false;whiteList["unicode-bidi"]=false;whiteList["vertical-align"]=false;whiteList["visibility"]=false;whiteList["voice-balance"]=false;whiteList["voice-duration"]=false;whiteList["voice-family"]=false;whiteList["voice-pitch"]=false;whiteList["voice-range"]=false;whiteList["voice-rate"]=false;whiteList["voice-stress"]=false;whiteList["voice-volume"]=false;whiteList["volume"]=false;whiteList["white-space"]=false;whiteList["widows"]=false;whiteList["width"]=true;whiteList["will-change"]=false;whiteList["word-break"]=true;whiteList["word-spacing"]=true;whiteList["word-wrap"]=true;whiteList["wrap-flow"]=false;whiteList["wrap-through"]=false;whiteList["writing-mode"]=false;whiteList["z-index"]=false;return whiteList}function onAttr(name,value,options){}function onIgnoreAttr(name,value,options){}var REGEXP_URL_JAVASCRIPT=/javascript\s*\:/gim;function safeAttrValue(name,value){if(REGEXP_URL_JAVASCRIPT.test(value))return"";return value}exports.whiteList=getDefaultWhiteList();exports.getDefaultWhiteList=getDefaultWhiteList;exports.onAttr=onAttr;exports.onIgnoreAttr=onIgnoreAttr;exports.safeAttrValue=safeAttrValue},{}],8:[function(require,module,exports){var DEFAULT=require("./default");var FilterCSS=require("./css");function filterCSS(html,options){var xss=new FilterCSS(options);return xss.process(html)}exports=module.exports=filterCSS;exports.FilterCSS=FilterCSS;for(var i in DEFAULT)exports[i]=DEFAULT[i];if(typeof window!=="undefined"){window.filterCSS=module.exports}},{"./css":6,"./default":7}],9:[function(require,module,exports){var _=require("./util");function parseStyle(css,onAttr){css=_.trimRight(css);if(css[css.length-1]!==";")css+=";";var cssLength=css.length;var isParenthesisOpen=false;var lastPos=0;var i=0;var retCSS="";function addNewAttr(){if(!isParenthesisOpen){var source=_.trim(css.slice(lastPos,i));var j=source.indexOf(":");if(j!==-1){var name=_.trim(source.slice(0,j));var value=_.trim(source.slice(j+1));if(name){var ret=onAttr(lastPos,retCSS.length,name,value,source);if(ret)retCSS+=ret+"; "}}}lastPos=i+1}for(;i<cssLength;i++){var c=css[i];if(c==="/"&&css[i+1]==="*"){var j=css.indexOf("*/",i+2);if(j===-1)break;i=j+1;lastPos=i+1;isParenthesisOpen=false}else if(c==="("){isParenthesisOpen=true}else if(c===")"){isParenthesisOpen=false}else if(c===";"){if(isParenthesisOpen){}else{addNewAttr()}}else if(c==="\n"){addNewAttr()}}return _.trim(retCSS)}module.exports=parseStyle},{"./util":10}],10:[function(require,module,exports){module.exports={indexOf:function(arr,item){var i,j;if(Array.prototype.indexOf){return arr.indexOf(item)}for(i=0,j=arr.length;i<j;i++){if(arr[i]===item){return i}}return-1},forEach:function(arr,fn,scope){var i,j;if(Array.prototype.forEach){return arr.forEach(fn,scope)}for(i=0,j=arr.length;i<j;i++){fn.call(scope,arr[i],i,arr)}},trim:function(str){if(String.prototype.trim){return str.trim()}return str.replace(/(^\s*)|(\s*$)/g,"")},trimRight:function(str){if(String.prototype.trimRight){return str.trimRight()}return str.replace(/(\s*$)/g,"")}}},{}]},{},[2]);
\ No newline at end of file
diff --git a/node_modules/xss/lib/cli.js b/node_modules/xss/lib/cli.js
new file mode 100644
index 0000000..4aa075e
--- /dev/null
+++ b/node_modules/xss/lib/cli.js
@@ -0,0 +1,45 @@
+/**
+ * command line tool
+ *
+ * @author Zongmin Lei<leizongmin@gmail.com>
+ */
+
+var xss = require("./");
+var readline = require("readline");
+
+var rl = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout
+});
+
+console.log('Enter a blank line to do xss(), enter "@quit" to exit.\n');
+
+function take(c, n) {
+  var ret = "";
+  for (var i = 0; i < n; i++) {
+    ret += c;
+  }
+  return ret;
+}
+
+function setPrompt(line) {
+  line = line.toString();
+  rl.setPrompt("[" + line + "]" + take(" ", 5 - line.length));
+  rl.prompt();
+}
+
+setPrompt(1);
+
+var html = [];
+rl.on("line", function(line) {
+  if (line === "@quit") return process.exit();
+  if (line === "") {
+    console.log("");
+    console.log(xss(html.join("\r\n")));
+    console.log("");
+    html = [];
+  } else {
+    html.push(line);
+  }
+  setPrompt(html.length + 1);
+});
diff --git a/node_modules/xss/lib/default.js b/node_modules/xss/lib/default.js
new file mode 100644
index 0000000..1452ed3
--- /dev/null
+++ b/node_modules/xss/lib/default.js
@@ -0,0 +1,415 @@
+/**
+ * default settings
+ *
+ * @author Zongmin Lei<leizongmin@gmail.com>
+ */
+
+var FilterCSS = require("cssfilter").FilterCSS;
+var getDefaultCSSWhiteList = require("cssfilter").getDefaultWhiteList;
+var _ = require("./util");
+
+function getDefaultWhiteList() {
+  return {
+    a: ["target", "href", "title"],
+    abbr: ["title"],
+    address: [],
+    area: ["shape", "coords", "href", "alt"],
+    article: [],
+    aside: [],
+    audio: ["autoplay", "controls", "loop", "preload", "src"],
+    b: [],
+    bdi: ["dir"],
+    bdo: ["dir"],
+    big: [],
+    blockquote: ["cite"],
+    br: [],
+    caption: [],
+    center: [],
+    cite: [],
+    code: [],
+    col: ["align", "valign", "span", "width"],
+    colgroup: ["align", "valign", "span", "width"],
+    dd: [],
+    del: ["datetime"],
+    details: ["open"],
+    div: [],
+    dl: [],
+    dt: [],
+    em: [],
+    font: ["color", "size", "face"],
+    footer: [],
+    h1: [],
+    h2: [],
+    h3: [],
+    h4: [],
+    h5: [],
+    h6: [],
+    header: [],
+    hr: [],
+    i: [],
+    img: ["src", "alt", "title", "width", "height"],
+    ins: ["datetime"],
+    li: [],
+    mark: [],
+    nav: [],
+    ol: [],
+    p: [],
+    pre: [],
+    s: [],
+    section: [],
+    small: [],
+    span: [],
+    sub: [],
+    sup: [],
+    strong: [],
+    table: ["width", "border", "align", "valign"],
+    tbody: ["align", "valign"],
+    td: ["width", "rowspan", "colspan", "align", "valign"],
+    tfoot: ["align", "valign"],
+    th: ["width", "rowspan", "colspan", "align", "valign"],
+    thead: ["align", "valign"],
+    tr: ["rowspan", "align", "valign"],
+    tt: [],
+    u: [],
+    ul: [],
+    video: ["autoplay", "controls", "loop", "preload", "src", "height", "width"]
+  };
+}
+
+var defaultCSSFilter = new FilterCSS();
+
+/**
+ * default onTag function
+ *
+ * @param {String} tag
+ * @param {String} html
+ * @param {Object} options
+ * @return {String}
+ */
+function onTag(tag, html, options) {
+  // do nothing
+}
+
+/**
+ * default onIgnoreTag function
+ *
+ * @param {String} tag
+ * @param {String} html
+ * @param {Object} options
+ * @return {String}
+ */
+function onIgnoreTag(tag, html, options) {
+  // do nothing
+}
+
+/**
+ * default onTagAttr function
+ *
+ * @param {String} tag
+ * @param {String} name
+ * @param {String} value
+ * @return {String}
+ */
+function onTagAttr(tag, name, value) {
+  // do nothing
+}
+
+/**
+ * default onIgnoreTagAttr function
+ *
+ * @param {String} tag
+ * @param {String} name
+ * @param {String} value
+ * @return {String}
+ */
+function onIgnoreTagAttr(tag, name, value) {
+  // do nothing
+}
+
+/**
+ * default escapeHtml function
+ *
+ * @param {String} html
+ */
+function escapeHtml(html) {
+  return html.replace(REGEXP_LT, "&lt;").replace(REGEXP_GT, "&gt;");
+}
+
+/**
+ * default safeAttrValue function
+ *
+ * @param {String} tag
+ * @param {String} name
+ * @param {String} value
+ * @param {Object} cssFilter
+ * @return {String}
+ */
+function safeAttrValue(tag, name, value, cssFilter) {
+  // unescape attribute value firstly
+  value = friendlyAttrValue(value);
+
+  if (name === "href" || name === "src") {
+    // filter `href` and `src` attribute
+    // only allow the value that starts with `http://` | `https://` | `mailto:` | `/` | `#`
+    value = _.trim(value);
+    if (value === "#") return "#";
+    if (
+      !(
+        value.substr(0, 7) === "http://" ||
+        value.substr(0, 8) === "https://" ||
+        value.substr(0, 7) === "mailto:" ||
+        value.substr(0, 4) === "tel:" ||
+        value[0] === "#" ||
+        value[0] === "/"
+      )
+    ) {
+      return "";
+    }
+  } else if (name === "background") {
+    // filter `background` attribute (maybe no use)
+    // `javascript:`
+    REGEXP_DEFAULT_ON_TAG_ATTR_4.lastIndex = 0;
+    if (REGEXP_DEFAULT_ON_TAG_ATTR_4.test(value)) {
+      return "";
+    }
+  } else if (name === "style") {
+    // `expression()`
+    REGEXP_DEFAULT_ON_TAG_ATTR_7.lastIndex = 0;
+    if (REGEXP_DEFAULT_ON_TAG_ATTR_7.test(value)) {
+      return "";
+    }
+    // `url()`
+    REGEXP_DEFAULT_ON_TAG_ATTR_8.lastIndex = 0;
+    if (REGEXP_DEFAULT_ON_TAG_ATTR_8.test(value)) {
+      REGEXP_DEFAULT_ON_TAG_ATTR_4.lastIndex = 0;
+      if (REGEXP_DEFAULT_ON_TAG_ATTR_4.test(value)) {
+        return "";
+      }
+    }
+    if (cssFilter !== false) {
+      cssFilter = cssFilter || defaultCSSFilter;
+      value = cssFilter.process(value);
+    }
+  }
+
+  // escape `<>"` before returns
+  value = escapeAttrValue(value);
+  return value;
+}
+
+// RegExp list
+var REGEXP_LT = /</g;
+var REGEXP_GT = />/g;
+var REGEXP_QUOTE = /"/g;
+var REGEXP_QUOTE_2 = /&quot;/g;
+var REGEXP_ATTR_VALUE_1 = /&#([a-zA-Z0-9]*);?/gim;
+var REGEXP_ATTR_VALUE_COLON = /&colon;?/gim;
+var REGEXP_ATTR_VALUE_NEWLINE = /&newline;?/gim;
+var REGEXP_DEFAULT_ON_TAG_ATTR_3 = /\/\*|\*\//gm;
+var REGEXP_DEFAULT_ON_TAG_ATTR_4 = /((j\s*a\s*v\s*a|v\s*b|l\s*i\s*v\s*e)\s*s\s*c\s*r\s*i\s*p\s*t\s*|m\s*o\s*c\s*h\s*a)\:/gi;
+var REGEXP_DEFAULT_ON_TAG_ATTR_5 = /^[\s"'`]*(d\s*a\s*t\s*a\s*)\:/gi;
+var REGEXP_DEFAULT_ON_TAG_ATTR_6 = /^[\s"'`]*(d\s*a\s*t\s*a\s*)\:\s*image\//gi;
+var REGEXP_DEFAULT_ON_TAG_ATTR_7 = /e\s*x\s*p\s*r\s*e\s*s\s*s\s*i\s*o\s*n\s*\(.*/gi;
+var REGEXP_DEFAULT_ON_TAG_ATTR_8 = /u\s*r\s*l\s*\(.*/gi;
+
+/**
+ * escape doube quote
+ *
+ * @param {String} str
+ * @return {String} str
+ */
+function escapeQuote(str) {
+  return str.replace(REGEXP_QUOTE, "&quot;");
+}
+
+/**
+ * unescape double quote
+ *
+ * @param {String} str
+ * @return {String} str
+ */
+function unescapeQuote(str) {
+  return str.replace(REGEXP_QUOTE_2, '"');
+}
+
+/**
+ * escape html entities
+ *
+ * @param {String} str
+ * @return {String}
+ */
+function escapeHtmlEntities(str) {
+  return str.replace(REGEXP_ATTR_VALUE_1, function replaceUnicode(str, code) {
+    return code[0] === "x" || code[0] === "X"
+      ? String.fromCharCode(parseInt(code.substr(1), 16))
+      : String.fromCharCode(parseInt(code, 10));
+  });
+}
+
+/**
+ * escape html5 new danger entities
+ *
+ * @param {String} str
+ * @return {String}
+ */
+function escapeDangerHtml5Entities(str) {
+  return str
+    .replace(REGEXP_ATTR_VALUE_COLON, ":")
+    .replace(REGEXP_ATTR_VALUE_NEWLINE, " ");
+}
+
+/**
+ * clear nonprintable characters
+ *
+ * @param {String} str
+ * @return {String}
+ */
+function clearNonPrintableCharacter(str) {
+  var str2 = "";
+  for (var i = 0, len = str.length; i < len; i++) {
+    str2 += str.charCodeAt(i) < 32 ? " " : str.charAt(i);
+  }
+  return _.trim(str2);
+}
+
+/**
+ * get friendly attribute value
+ *
+ * @param {String} str
+ * @return {String}
+ */
+function friendlyAttrValue(str) {
+  str = unescapeQuote(str);
+  str = escapeHtmlEntities(str);
+  str = escapeDangerHtml5Entities(str);
+  str = clearNonPrintableCharacter(str);
+  return str;
+}
+
+/**
+ * unescape attribute value
+ *
+ * @param {String} str
+ * @return {String}
+ */
+function escapeAttrValue(str) {
+  str = escapeQuote(str);
+  str = escapeHtml(str);
+  return str;
+}
+
+/**
+ * `onIgnoreTag` function for removing all the tags that are not in whitelist
+ */
+function onIgnoreTagStripAll() {
+  return "";
+}
+
+/**
+ * remove tag body
+ * specify a `tags` list, if the tag is not in the `tags` list then process by the specify function (optional)
+ *
+ * @param {array} tags
+ * @param {function} next
+ */
+function StripTagBody(tags, next) {
+  if (typeof next !== "function") {
+    next = function() {};
+  }
+
+  var isRemoveAllTag = !Array.isArray(tags);
+  function isRemoveTag(tag) {
+    if (isRemoveAllTag) return true;
+    return _.indexOf(tags, tag) !== -1;
+  }
+
+  var removeList = [];
+  var posStart = false;
+
+  return {
+    onIgnoreTag: function(tag, html, options) {
+      if (isRemoveTag(tag)) {
+        if (options.isClosing) {
+          var ret = "[/removed]";
+          var end = options.position + ret.length;
+          removeList.push([
+            posStart !== false ? posStart : options.position,
+            end
+          ]);
+          posStart = false;
+          return ret;
+        } else {
+          if (!posStart) {
+            posStart = options.position;
+          }
+          return "[removed]";
+        }
+      } else {
+        return next(tag, html, options);
+      }
+    },
+    remove: function(html) {
+      var rethtml = "";
+      var lastPos = 0;
+      _.forEach(removeList, function(pos) {
+        rethtml += html.slice(lastPos, pos[0]);
+        lastPos = pos[1];
+      });
+      rethtml += html.slice(lastPos);
+      return rethtml;
+    }
+  };
+}
+
+/**
+ * remove html comments
+ *
+ * @param {String} html
+ * @return {String}
+ */
+function stripCommentTag(html) {
+  return html.replace(STRIP_COMMENT_TAG_REGEXP, "");
+}
+var STRIP_COMMENT_TAG_REGEXP = /<!--[\s\S]*?-->/g;
+
+/**
+ * remove invisible characters
+ *
+ * @param {String} html
+ * @return {String}
+ */
+function stripBlankChar(html) {
+  var chars = html.split("");
+  chars = chars.filter(function(char) {
+    var c = char.charCodeAt(0);
+    if (c === 127) return false;
+    if (c <= 31) {
+      if (c === 10 || c === 13) return true;
+      return false;
+    }
+    return true;
+  });
+  return chars.join("");
+}
+
+exports.whiteList = getDefaultWhiteList();
+exports.getDefaultWhiteList = getDefaultWhiteList;
+exports.onTag = onTag;
+exports.onIgnoreTag = onIgnoreTag;
+exports.onTagAttr = onTagAttr;
+exports.onIgnoreTagAttr = onIgnoreTagAttr;
+exports.safeAttrValue = safeAttrValue;
+exports.escapeHtml = escapeHtml;
+exports.escapeQuote = escapeQuote;
+exports.unescapeQuote = unescapeQuote;
+exports.escapeHtmlEntities = escapeHtmlEntities;
+exports.escapeDangerHtml5Entities = escapeDangerHtml5Entities;
+exports.clearNonPrintableCharacter = clearNonPrintableCharacter;
+exports.friendlyAttrValue = friendlyAttrValue;
+exports.escapeAttrValue = escapeAttrValue;
+exports.onIgnoreTagStripAll = onIgnoreTagStripAll;
+exports.StripTagBody = StripTagBody;
+exports.stripCommentTag = stripCommentTag;
+exports.stripBlankChar = stripBlankChar;
+exports.cssFilter = defaultCSSFilter;
+exports.getDefaultCSSWhiteList = getDefaultCSSWhiteList;
diff --git a/node_modules/xss/lib/index.js b/node_modules/xss/lib/index.js
new file mode 100644
index 0000000..e0c1a06
--- /dev/null
+++ b/node_modules/xss/lib/index.js
@@ -0,0 +1,40 @@
+/**
+ * xss
+ *
+ * @author Zongmin Lei<leizongmin@gmail.com>
+ */
+
+var DEFAULT = require("./default");
+var parser = require("./parser");
+var FilterXSS = require("./xss");
+
+/**
+ * filter xss function
+ *
+ * @param {String} html
+ * @param {Object} options { whiteList, onTag, onTagAttr, onIgnoreTag, onIgnoreTagAttr, safeAttrValue, escapeHtml }
+ * @return {String}
+ */
+function filterXSS(html, options) {
+  var xss = new FilterXSS(options);
+  return xss.process(html);
+}
+
+exports = module.exports = filterXSS;
+exports.filterXSS = filterXSS;
+exports.FilterXSS = FilterXSS;
+for (var i in DEFAULT) exports[i] = DEFAULT[i];
+for (var i in parser) exports[i] = parser[i];
+
+// using `xss` on the browser, output `filterXSS` to the globals
+if (typeof window !== "undefined") {
+  window.filterXSS = module.exports;
+}
+
+// using `xss` on the WebWorker, output `filterXSS` to the globals
+function isWorkerEnv() {
+  return typeof self !== 'undefined' && typeof DedicatedWorkerGlobalScope !== 'undefined' && self instanceof DedicatedWorkerGlobalScope;
+}
+if (isWorkerEnv()) {
+  self.filterXSS = module.exports;
+}
diff --git a/node_modules/xss/lib/parser.js b/node_modules/xss/lib/parser.js
new file mode 100644
index 0000000..7c15def
--- /dev/null
+++ b/node_modules/xss/lib/parser.js
@@ -0,0 +1,239 @@
+/**
+ * Simple HTML Parser
+ *
+ * @author Zongmin Lei<leizongmin@gmail.com>
+ */
+
+var _ = require("./util");
+
+/**
+ * get tag name
+ *
+ * @param {String} html e.g. '<a hef="#">'
+ * @return {String}
+ */
+function getTagName(html) {
+  var i = _.spaceIndex(html);
+  if (i === -1) {
+    var tagName = html.slice(1, -1);
+  } else {
+    var tagName = html.slice(1, i + 1);
+  }
+  tagName = _.trim(tagName).toLowerCase();
+  if (tagName.slice(0, 1) === "/") tagName = tagName.slice(1);
+  if (tagName.slice(-1) === "/") tagName = tagName.slice(0, -1);
+  return tagName;
+}
+
+/**
+ * is close tag?
+ *
+ * @param {String} html 如：'<a hef="#">'
+ * @return {Boolean}
+ */
+function isClosing(html) {
+  return html.slice(0, 2) === "</";
+}
+
+/**
+ * parse input html and returns processed html
+ *
+ * @param {String} html
+ * @param {Function} onTag e.g. function (sourcePosition, position, tag, html, isClosing)
+ * @param {Function} escapeHtml
+ * @return {String}
+ */
+function parseTag(html, onTag, escapeHtml) {
+  "user strict";
+
+  var rethtml = "";
+  var lastPos = 0;
+  var tagStart = false;
+  var quoteStart = false;
+  var currentPos = 0;
+  var len = html.length;
+  var currentTagName = "";
+  var currentHtml = "";
+
+  for (currentPos = 0; currentPos < len; currentPos++) {
+    var c = html.charAt(currentPos);
+    if (tagStart === false) {
+      if (c === "<") {
+        tagStart = currentPos;
+        continue;
+      }
+    } else {
+      if (quoteStart === false) {
+        if (c === "<") {
+          rethtml += escapeHtml(html.slice(lastPos, currentPos));
+          tagStart = currentPos;
+          lastPos = currentPos;
+          continue;
+        }
+        if (c === ">") {
+          rethtml += escapeHtml(html.slice(lastPos, tagStart));
+          currentHtml = html.slice(tagStart, currentPos + 1);
+          currentTagName = getTagName(currentHtml);
+          rethtml += onTag(
+            tagStart,
+            rethtml.length,
+            currentTagName,
+            currentHtml,
+            isClosing(currentHtml)
+          );
+          lastPos = currentPos + 1;
+          tagStart = false;
+          continue;
+        }
+        if ((c === '"' || c === "'") && html.charAt(currentPos - 1) === "=") {
+          quoteStart = c;
+          continue;
+        }
+      } else {
+        if (c === quoteStart) {
+          quoteStart = false;
+          continue;
+        }
+      }
+    }
+  }
+  if (lastPos < html.length) {
+    rethtml += escapeHtml(html.substr(lastPos));
+  }
+
+  return rethtml;
+}
+
+var REGEXP_ILLEGAL_ATTR_NAME = /[^a-zA-Z0-9_:\.\-]/gim;
+
+/**
+ * parse input attributes and returns processed attributes
+ *
+ * @param {String} html e.g. `href="#" target="_blank"`
+ * @param {Function} onAttr e.g. `function (name, value)`
+ * @return {String}
+ */
+function parseAttr(html, onAttr) {
+  "user strict";
+
+  var lastPos = 0;
+  var retAttrs = [];
+  var tmpName = false;
+  var len = html.length;
+
+  function addAttr(name, value) {
+    name = _.trim(name);
+    name = name.replace(REGEXP_ILLEGAL_ATTR_NAME, "").toLowerCase();
+    if (name.length < 1) return;
+    var ret = onAttr(name, value || "");
+    if (ret) retAttrs.push(ret);
+  }
+
+  // 逐个分析字符
+  for (var i = 0; i < len; i++) {
+    var c = html.charAt(i);
+    var v, j;
+    if (tmpName === false && c === "=") {
+      tmpName = html.slice(lastPos, i);
+      lastPos = i + 1;
+      continue;
+    }
+    if (tmpName !== false) {
+      if (
+        i === lastPos &&
+        (c === '"' || c === "'") &&
+        html.charAt(i - 1) === "="
+      ) {
+        j = html.indexOf(c, i + 1);
+        if (j === -1) {
+          break;
+        } else {
+          v = _.trim(html.slice(lastPos + 1, j));
+          addAttr(tmpName, v);
+          tmpName = false;
+          i = j;
+          lastPos = i + 1;
+          continue;
+        }
+      }
+    }
+    if (/\s|\n|\t/.test(c)) {
+      html = html.replace(/\s|\n|\t/g, " ");
+      if (tmpName === false) {
+        j = findNextEqual(html, i);
+        if (j === -1) {
+          v = _.trim(html.slice(lastPos, i));
+          addAttr(v);
+          tmpName = false;
+          lastPos = i + 1;
+          continue;
+        } else {
+          i = j - 1;
+          continue;
+        }
+      } else {
+        j = findBeforeEqual(html, i - 1);
+        if (j === -1) {
+          v = _.trim(html.slice(lastPos, i));
+          v = stripQuoteWrap(v);
+          addAttr(tmpName, v);
+          tmpName = false;
+          lastPos = i + 1;
+          continue;
+        } else {
+          continue;
+        }
+      }
+    }
+  }
+
+  if (lastPos < html.length) {
+    if (tmpName === false) {
+      addAttr(html.slice(lastPos));
+    } else {
+      addAttr(tmpName, stripQuoteWrap(_.trim(html.slice(lastPos))));
+    }
+  }
+
+  return _.trim(retAttrs.join(" "));
+}
+
+function findNextEqual(str, i) {
+  for (; i < str.length; i++) {
+    var c = str[i];
+    if (c === " ") continue;
+    if (c === "=") return i;
+    return -1;
+  }
+}
+
+function findBeforeEqual(str, i) {
+  for (; i > 0; i--) {
+    var c = str[i];
+    if (c === " ") continue;
+    if (c === "=") return i;
+    return -1;
+  }
+}
+
+function isQuoteWrapString(text) {
+  if (
+    (text[0] === '"' && text[text.length - 1] === '"') ||
+    (text[0] === "'" && text[text.length - 1] === "'")
+  ) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
+function stripQuoteWrap(text) {
+  if (isQuoteWrapString(text)) {
+    return text.substr(1, text.length - 2);
+  } else {
+    return text;
+  }
+}
+
+exports.parseTag = parseTag;
+exports.parseAttr = parseAttr;
diff --git a/node_modules/xss/lib/util.js b/node_modules/xss/lib/util.js
new file mode 100644
index 0000000..1dcd7fa
--- /dev/null
+++ b/node_modules/xss/lib/util.js
@@ -0,0 +1,34 @@
+module.exports = {
+  indexOf: function(arr, item) {
+    var i, j;
+    if (Array.prototype.indexOf) {
+      return arr.indexOf(item);
+    }
+    for (i = 0, j = arr.length; i < j; i++) {
+      if (arr[i] === item) {
+        return i;
+      }
+    }
+    return -1;
+  },
+  forEach: function(arr, fn, scope) {
+    var i, j;
+    if (Array.prototype.forEach) {
+      return arr.forEach(fn, scope);
+    }
+    for (i = 0, j = arr.length; i < j; i++) {
+      fn.call(scope, arr[i], i, arr);
+    }
+  },
+  trim: function(str) {
+    if (String.prototype.trim) {
+      return str.trim();
+    }
+    return str.replace(/(^\s*)|(\s*$)/g, "");
+  },
+  spaceIndex: function(str) {
+    var reg = /\s|\n|\t/;
+    var match = reg.exec(str);
+    return match ? match.index : -1;
+  }
+};
diff --git a/node_modules/xss/lib/xss.js b/node_modules/xss/lib/xss.js
new file mode 100644
index 0000000..74d2e42
--- /dev/null
+++ b/node_modules/xss/lib/xss.js
@@ -0,0 +1,211 @@
+/**
+ * filter xss
+ *
+ * @author Zongmin Lei<leizongmin@gmail.com>
+ */
+
+var FilterCSS = require("cssfilter").FilterCSS;
+var DEFAULT = require("./default");
+var parser = require("./parser");
+var parseTag = parser.parseTag;
+var parseAttr = parser.parseAttr;
+var _ = require("./util");
+
+/**
+ * returns `true` if the input value is `undefined` or `null`
+ *
+ * @param {Object} obj
+ * @return {Boolean}
+ */
+function isNull(obj) {
+  return obj === undefined || obj === null;
+}
+
+/**
+ * get attributes for a tag
+ *
+ * @param {String} html
+ * @return {Object}
+ *   - {String} html
+ *   - {Boolean} closing
+ */
+function getAttrs(html) {
+  var i = _.spaceIndex(html);
+  if (i === -1) {
+    return {
+      html: "",
+      closing: html[html.length - 2] === "/"
+    };
+  }
+  html = _.trim(html.slice(i + 1, -1));
+  var isClosing = html[html.length - 1] === "/";
+  if (isClosing) html = _.trim(html.slice(0, -1));
+  return {
+    html: html,
+    closing: isClosing
+  };
+}
+
+/**
+ * shallow copy
+ *
+ * @param {Object} obj
+ * @return {Object}
+ */
+function shallowCopyObject(obj) {
+  var ret = {};
+  for (var i in obj) {
+    ret[i] = obj[i];
+  }
+  return ret;
+}
+
+/**
+ * FilterXSS class
+ *
+ * @param {Object} options
+ *        whiteList, onTag, onTagAttr, onIgnoreTag,
+ *        onIgnoreTagAttr, safeAttrValue, escapeHtml
+ *        stripIgnoreTagBody, allowCommentTag, stripBlankChar
+ *        css{whiteList, onAttr, onIgnoreAttr} `css=false` means don't use `cssfilter`
+ */
+function FilterXSS(options) {
+  options = shallowCopyObject(options || {});
+
+  if (options.stripIgnoreTag) {
+    if (options.onIgnoreTag) {
+      console.error(
+        'Notes: cannot use these two options "stripIgnoreTag" and "onIgnoreTag" at the same time'
+      );
+    }
+    options.onIgnoreTag = DEFAULT.onIgnoreTagStripAll;
+  }
+
+  options.whiteList = options.whiteList || DEFAULT.whiteList;
+  options.onTag = options.onTag || DEFAULT.onTag;
+  options.onTagAttr = options.onTagAttr || DEFAULT.onTagAttr;
+  options.onIgnoreTag = options.onIgnoreTag || DEFAULT.onIgnoreTag;
+  options.onIgnoreTagAttr = options.onIgnoreTagAttr || DEFAULT.onIgnoreTagAttr;
+  options.safeAttrValue = options.safeAttrValue || DEFAULT.safeAttrValue;
+  options.escapeHtml = options.escapeHtml || DEFAULT.escapeHtml;
+  this.options = options;
+
+  if (options.css === false) {
+    this.cssFilter = false;
+  } else {
+    options.css = options.css || {};
+    this.cssFilter = new FilterCSS(options.css);
+  }
+}
+
+/**
+ * start process and returns result
+ *
+ * @param {String} html
+ * @return {String}
+ */
+FilterXSS.prototype.process = function(html) {
+  // compatible with the input
+  html = html || "";
+  html = html.toString();
+  if (!html) return "";
+
+  var me = this;
+  var options = me.options;
+  var whiteList = options.whiteList;
+  var onTag = options.onTag;
+  var onIgnoreTag = options.onIgnoreTag;
+  var onTagAttr = options.onTagAttr;
+  var onIgnoreTagAttr = options.onIgnoreTagAttr;
+  var safeAttrValue = options.safeAttrValue;
+  var escapeHtml = options.escapeHtml;
+  var cssFilter = me.cssFilter;
+
+  // remove invisible characters
+  if (options.stripBlankChar) {
+    html = DEFAULT.stripBlankChar(html);
+  }
+
+  // remove html comments
+  if (!options.allowCommentTag) {
+    html = DEFAULT.stripCommentTag(html);
+  }
+
+  // if enable stripIgnoreTagBody
+  var stripIgnoreTagBody = false;
+  if (options.stripIgnoreTagBody) {
+    var stripIgnoreTagBody = DEFAULT.StripTagBody(
+      options.stripIgnoreTagBody,
+      onIgnoreTag
+    );
+    onIgnoreTag = stripIgnoreTagBody.onIgnoreTag;
+  }
+
+  var retHtml = parseTag(
+    html,
+    function(sourcePosition, position, tag, html, isClosing) {
+      var info = {
+        sourcePosition: sourcePosition,
+        position: position,
+        isClosing: isClosing,
+        isWhite: whiteList.hasOwnProperty(tag)
+      };
+
+      // call `onTag()`
+      var ret = onTag(tag, html, info);
+      if (!isNull(ret)) return ret;
+
+      if (info.isWhite) {
+        if (info.isClosing) {
+          return "</" + tag + ">";
+        }
+
+        var attrs = getAttrs(html);
+        var whiteAttrList = whiteList[tag];
+        var attrsHtml = parseAttr(attrs.html, function(name, value) {
+          // call `onTagAttr()`
+          var isWhiteAttr = _.indexOf(whiteAttrList, name) !== -1;
+          var ret = onTagAttr(tag, name, value, isWhiteAttr);
+          if (!isNull(ret)) return ret;
+
+          if (isWhiteAttr) {
+            // call `safeAttrValue()`
+            value = safeAttrValue(tag, name, value, cssFilter);
+            if (value) {
+              return name + '="' + value + '"';
+            } else {
+              return name;
+            }
+          } else {
+            // call `onIgnoreTagAttr()`
+            var ret = onIgnoreTagAttr(tag, name, value, isWhiteAttr);
+            if (!isNull(ret)) return ret;
+            return;
+          }
+        });
+
+        // build new tag html
+        var html = "<" + tag;
+        if (attrsHtml) html += " " + attrsHtml;
+        if (attrs.closing) html += " /";
+        html += ">";
+        return html;
+      } else {
+        // call `onIgnoreTag()`
+        var ret = onIgnoreTag(tag, html, info);
+        if (!isNull(ret)) return ret;
+        return escapeHtml(html);
+      }
+    },
+    escapeHtml
+  );
+
+  // if enable stripIgnoreTagBody
+  if (stripIgnoreTagBody) {
+    retHtml = stripIgnoreTagBody.remove(retHtml);
+  }
+
+  return retHtml;
+};
+
+module.exports = FilterXSS;
diff --git a/node_modules/xss/package.json b/node_modules/xss/package.json
new file mode 100644
index 0000000..8caf468
--- /dev/null
+++ b/node_modules/xss/package.json
@@ -0,0 +1,92 @@
+{
+  "_from": "xss",
+  "_id": "xss@1.0.6",
+  "_inBundle": false,
+  "_integrity": "sha512-6Q9TPBeNyoTRxgZFk5Ggaepk/4vUOYdOsIUYvLehcsIZTFjaavbVnsuAkLA5lIFuug5hw8zxcB9tm01gsjph2A==",
+  "_location": "/xss",
+  "_phantomChildren": {},
+  "_requested": {
+    "type": "tag",
+    "registry": true,
+    "raw": "xss",
+    "name": "xss",
+    "escapedName": "xss",
+    "rawSpec": "",
+    "saveSpec": null,
+    "fetchSpec": "latest"
+  },
+  "_requiredBy": [
+    "#USER",
+    "/"
+  ],
+  "_resolved": "https://registry.npmjs.org/xss/-/xss-1.0.6.tgz",
+  "_shasum": "eaf11e9fc476e3ae289944a1009efddd8a124b51",
+  "_spec": "xss",
+  "_where": "/home/cargova/projects/beziapp.github.io",
+  "author": {
+    "name": "Zongmin Lei",
+    "email": "leizongmin@gmail.com",
+    "url": "http://ucdok.com"
+  },
+  "bin": {
+    "xss": "./bin/xss"
+  },
+  "bugs": {
+    "url": "https://github.com/leizongmin/js-xss/issues"
+  },
+  "bundleDependencies": false,
+  "dependencies": {
+    "commander": "^2.9.0",
+    "cssfilter": "0.0.10"
+  },
+  "deprecated": false,
+  "description": "Sanitize untrusted HTML (to prevent XSS) with a configuration specified by a Whitelist",
+  "devDependencies": {
+    "browserify": "^14.1.0",
+    "coveralls": "^3.0.0",
+    "debug": "^3.1.0",
+    "istanbul": "^0.4.3",
+    "mocha": "^4.0.1",
+    "uglify-js": "^3.0.14"
+  },
+  "engines": {
+    "node": ">= 0.10.0"
+  },
+  "files": [
+    "lib",
+    "bin/xss",
+    "dist",
+    "typings/*.d.ts"
+  ],
+  "homepage": "https://github.com/leizongmin/js-xss",
+  "keywords": [
+    "sanitization",
+    "xss",
+    "sanitize",
+    "sanitisation",
+    "input",
+    "security",
+    "escape",
+    "encode",
+    "filter",
+    "validator",
+    "html",
+    "injection",
+    "whitelist"
+  ],
+  "license": "MIT",
+  "main": "./lib/index.js",
+  "name": "xss",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/leizongmin/js-xss.git"
+  },
+  "scripts": {
+    "build": "./bin/build",
+    "prepublish": "npm run test && npm run build",
+    "test": "export DEBUG=xss:* && mocha -t 5000",
+    "test-cov": "export DEBUG=xss:* && istanbul cover _mocha --report lcovonly -- -t 5000 -R spec && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage"
+  },
+  "typings": "./typings/xss.d.ts",
+  "version": "1.0.6"
+}
diff --git a/node_modules/xss/typings/xss.d.ts b/node_modules/xss/typings/xss.d.ts
new file mode 100644
index 0000000..1f6f2ca
--- /dev/null
+++ b/node_modules/xss/typings/xss.d.ts
@@ -0,0 +1,189 @@
+/**
+ * xss
+ *
+ * @author Zongmin Lei<leizongmin@gmail.com>
+ */
+
+declare global {
+  function filterXSS(html: string, options?: IFilterXSSOptions): string;
+
+  namespace XSS {
+    export interface IFilterXSSOptions {
+      whiteList?: IWhiteList;
+      onTag?: OnTagHandler;
+      onTagAttr?: OnTagAttrHandler;
+      onIgnoreTag?: OnTagHandler;
+      onIgnoreTagAttr?: OnTagAttrHandler;
+      safeAttrValue?: SafeAttrValueHandler;
+      escapeHtml?: EscapeHandler;
+      stripIgnoreTag?: boolean;
+      stripIgnoreTagBody?: boolean | string[];
+      allowCommentTag?: boolean;
+      stripBlankChar?: boolean;
+      css?: {} | boolean;
+    }
+
+    interface IWhiteList {
+      a?: string[];
+      abbr?: string[];
+      address?: string[];
+      area?: string[];
+      article?: string[];
+      aside?: string[];
+      audio?: string[];
+      b?: string[];
+      bdi?: string[];
+      bdo?: string[];
+      big?: string[];
+      blockquote?: string[];
+      br?: string[];
+      caption?: string[];
+      center?: string[];
+      cite?: string[];
+      code?: string[];
+      col?: string[];
+      colgroup?: string[];
+      dd?: string[];
+      del?: string[];
+      details?: string[];
+      div?: string[];
+      dl?: string[];
+      dt?: string[];
+      em?: string[];
+      font?: string[];
+      footer?: string[];
+      h1?: string[];
+      h2?: string[];
+      h3?: string[];
+      h4?: string[];
+      h5?: string[];
+      h6?: string[];
+      header?: string[];
+      hr?: string[];
+      i?: string[];
+      img?: string[];
+      ins?: string[];
+      li?: string[];
+      mark?: string[];
+      nav?: string[];
+      ol?: string[];
+      p?: string[];
+      pre?: string[];
+      s?: string[];
+      section?: string[];
+      small?: string[];
+      span?: string[];
+      sub?: string[];
+      sup?: string[];
+      strong?: string[];
+      table?: string[];
+      tbody?: string[];
+      td?: string[];
+      tfoot?: string[];
+      th?: string[];
+      thead?: string[];
+      tr?: string[];
+      tt?: string[];
+      u?: string[];
+      ul?: string[];
+      video?: string[];
+    }
+
+    type OnTagHandler = (
+      tag: string,
+      html: string,
+      options: {}
+    ) => string | void;
+
+    type OnTagAttrHandler = (
+      tag: string,
+      name: string,
+      value: string,
+      isWhiteAttr: boolean
+    ) => string | void;
+
+    type SafeAttrValueHandler = (
+      tag: string,
+      name: string,
+      value: string,
+      cssFilter: ICSSFilter
+    ) => string;
+
+    type EscapeHandler = (str: string) => string;
+
+    interface ICSSFilter {
+      process(value: string): string;
+    }
+  }
+}
+
+export interface IFilterXSSOptions extends XSS.IFilterXSSOptions {}
+
+export interface IWhiteList extends XSS.IWhiteList {}
+
+export type OnTagHandler = XSS.OnTagHandler;
+
+export type OnTagAttrHandler = XSS.OnTagAttrHandler;
+
+export type SafeAttrValueHandler = XSS.SafeAttrValueHandler;
+
+export type EscapeHandler = XSS.EscapeHandler;
+
+export interface ICSSFilter extends XSS.ICSSFilter {}
+
+export function StripTagBody(
+  tags: string[],
+  next: () => void
+): {
+  onIgnoreTag(
+    tag: string,
+    html: string,
+    options: {
+      position: number;
+      isClosing: boolean;
+    }
+  ): string;
+  remove(html: string): string;
+};
+
+export class FilterXSS {
+  constructor(options?: IFilterXSSOptions);
+  process(html: string): string;
+}
+
+export function filterXSS(html: string, options?: IFilterXSSOptions): string;
+export function parseTag(
+  html: string,
+  onTag: (
+    sourcePosition: number,
+    position: number,
+    tag: string,
+    html: string,
+    isClosing: boolean
+  ) => string,
+  escapeHtml: EscapeHandler
+): string;
+export function parseAttr(
+  html: string,
+  onAttr: (name: string, value: string) => string
+): string;
+export const whiteList: IWhiteList;
+export function getDefaultWhiteList(): IWhiteList;
+export const onTag: OnTagHandler;
+export const onIgnoreTag: OnTagHandler;
+export const onTagAttr: OnTagAttrHandler;
+export const onIgnoreTagAttr: OnTagAttrHandler;
+export const safeAttrValue: SafeAttrValueHandler;
+export const escapeHtml: EscapeHandler;
+export const escapeQuote: EscapeHandler;
+export const unescapeQuote: EscapeHandler;
+export const escapeHtmlEntities: EscapeHandler;
+export const escapeDangerHtml5Entities: EscapeHandler;
+export const clearNonPrintableCharacter: EscapeHandler;
+export const friendlyAttrValue: EscapeHandler;
+export const escapeAttrValue: EscapeHandler;
+export function onIgnoreTagStripAll(): string;
+export const stripCommentTag: EscapeHandler;
+export const stripBlankChar: EscapeHandler;
+export const cssFilter: ICSSFilter;
+export function getDefaultCSSWhiteList(): ICSSFilter;