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// HTTPFormParser.cpp
// Implements the cHTTPFormParser class representing a parser for forms sent over HTTP
#include "Globals.h"
#include "HTTPFormParser.h"
#include "HTTPMessage.h"
AString cHTTPFormParser::m_FormURLEncoded("application/x-www-form-urlencoded");
AString cHTTPFormParser::m_MultipartFormData("multipart/form-data");
cHTTPFormParser::cHTTPFormParser(cHTTPRequest & a_Request) :
m_IsValid(true)
{
if (a_Request.GetMethod() == "GET")
{
m_Kind = fpkURL;
// Directly parse the URL in the request:
const AString & URL = a_Request.GetURL();
size_t idxQM = URL.find('?');
if (idxQM != AString::npos)
{
Parse(URL.c_str() + idxQM + 1, URL.size() - idxQM - 1);
}
return;
}
if ((a_Request.GetMethod() == "POST") || (a_Request.GetMethod() == "PUT"))
{
if (a_Request.GetContentType() == m_FormURLEncoded)
{
m_Kind = fpkFormUrlEncoded;
return;
}
if (a_Request.GetContentType().substr(0, m_MultipartFormData.length()) == m_MultipartFormData)
{
m_Kind = fpkMultipart;
return;
}
}
ASSERT(!"Unhandled request method");
}
void cHTTPFormParser::Parse(const char * a_Data, int a_Size)
{
m_IncomingData.append(a_Data, a_Size);
switch (m_Kind)
{
case fpkURL:
case fpkFormUrlEncoded:
{
// This format is used for smaller forms (not file uploads), so we can delay parsing it until Finish()
break;
}
case fpkMultipart:
{
ParseMultipart();
break;
}
default:
{
ASSERT(!"Unhandled form kind");
break;
}
}
}
bool cHTTPFormParser::Finish(void)
{
switch (m_Kind)
{
case fpkURL:
case fpkFormUrlEncoded:
{
// m_IncomingData has all the form data, parse it now:
ParseFormUrlEncoded();
break;
}
}
return (m_IsValid && m_IncomingData.empty());
}
bool cHTTPFormParser::HasFormData(const cHTTPRequest & a_Request)
{
const AString & ContentType = a_Request.GetContentType();
return (
(ContentType == m_FormURLEncoded) ||
(ContentType.substr(0, m_MultipartFormData.length()) == m_MultipartFormData) ||
(
(a_Request.GetMethod() == "GET") &&
(a_Request.GetURL().find('?') != AString::npos)
)
);
return false;
}
void cHTTPFormParser::ParseFormUrlEncoded(void)
{
// Parse m_IncomingData for all the variables; no more data is incoming, since this is called from Finish()
// This may not be the most performant version, but we don't care, the form data is small enough and we're not a full-fledged web server anyway
AStringVector Lines = StringSplit(m_IncomingData, "&");
for (AStringVector::iterator itr = Lines.begin(), end = Lines.end(); itr != end; ++itr)
{
AStringVector Components = StringSplit(*itr, "=");
switch (Components.size())
{
default:
{
// Neither name nor value, or too many "="s, mark this as invalid form:
m_IsValid = false;
return;
}
case 1:
{
// Only name present
(*this)[URLDecode(ReplaceAllCharOccurrences(Components[0], '+', ' '))] = "";
break;
}
case 2:
{
// name=value format:
(*this)[URLDecode(ReplaceAllCharOccurrences(Components[0], '+', ' '))] = URLDecode(ReplaceAllCharOccurrences(Components[1], '+', ' '));
break;
}
}
} // for itr - Lines[]
m_IncomingData.clear();
}
void cHTTPFormParser::ParseMultipart(void)
{
// TODO
}
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