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-rw-r--r--src/HTTPServer/UrlParser.cpp200
1 files changed, 200 insertions, 0 deletions
diff --git a/src/HTTPServer/UrlParser.cpp b/src/HTTPServer/UrlParser.cpp
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+++ b/src/HTTPServer/UrlParser.cpp
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+
+// UrlParser.cpp
+
+// Implements the cUrlParser class that parses string URL into individual parts
+
+#include "Globals.h"
+#include "UrlParser.h"
+
+
+
+
+
+UInt16 cUrlParser::GetDefaultPort(const AString & a_Scheme)
+{
+ if (a_Scheme == "http")
+ {
+ return 80;
+ }
+ else if (a_Scheme == "https")
+ {
+ return 443;
+ }
+ else if (a_Scheme == "ftp")
+ {
+ return 21;
+ }
+ else if (a_Scheme == "mailto")
+ {
+ return 25;
+ }
+ return 0;
+}
+
+
+
+
+
+std::pair<bool, AString> cUrlParser::ParseAuthorityPart(
+ const AString & a_AuthorityPart,
+ AString & a_Username,
+ AString & a_Password,
+ AString & a_Host,
+ UInt16 & a_Port
+)
+{
+ /*
+ a_AuthorityPart format:
+ [user:password@]host[:port]
+ host can be an IPv4, hostname, or an IPv6 enclosed in brackets
+ Assume only the password can contain an additional at-sign
+ */
+
+ // Split the authority on the last at-sign, if present:
+ auto idxLastAtSign = a_AuthorityPart.find_last_of('@');
+ auto credPart = (idxLastAtSign == AString::npos) ? AString() : a_AuthorityPart.substr(0, idxLastAtSign);
+ auto srvrPart = (idxLastAtSign == AString::npos) ? a_AuthorityPart : a_AuthorityPart.substr(idxLastAtSign + 1);
+
+ // User credentials are completely optional:
+ auto idxCredColon = credPart.find(':');
+ a_Username = credPart.substr(0, idxCredColon);
+ a_Password = (idxCredColon == AString::npos) ? AString() : credPart.substr(idxCredColon + 1);
+
+ // Host can be a hostname, IPv4 or [IPv6]. If in brackets, search for the closing bracket first
+ if (srvrPart.empty())
+ {
+ // No host information at all. Bail out with success
+ a_Host.clear();
+ return std::make_pair(true, AString());
+ }
+ if (srvrPart[0] == '[')
+ {
+ // [IPv6] host, search for the closing bracket
+ auto idxClosingBracket = srvrPart.find(']');
+ if (idxClosingBracket == AString::npos)
+ {
+ return std::make_pair(false, "Invalid IPv6-like address, missing closing bracket");
+ }
+ a_Host = srvrPart.substr(0, idxClosingBracket);
+ auto portPart = srvrPart.substr(idxClosingBracket + 1);
+ if (portPart.empty())
+ {
+ // No port was specified, return success
+ return std::make_pair(true, AString());
+ }
+ if (portPart[0] != ':')
+ {
+ return std::make_pair(false, "Invalid port format after IPv6 address, mising colon");
+ }
+ if (!StringToInteger(portPart.substr(2), a_Port))
+ {
+ return std::make_pair(false, "Failed to parse port number after IPv6 address");
+ }
+ return std::make_pair(true, AString());
+ }
+
+ // Not an [IPv6] address, split on the last colon:
+ auto idxLastColon = srvrPart.find_last_of(':');
+ a_Host = srvrPart.substr(0, idxLastColon);
+ if (idxLastColon == AString::npos)
+ {
+ // No port was specified, return success
+ return std::make_pair(true, AString());
+ }
+ auto portPart = srvrPart.substr(idxLastColon + 1);
+ if (!StringToInteger(portPart, a_Port))
+ {
+ return std::make_pair(false, "Failed to parse port number after hostname");
+ }
+ return std::make_pair(true, AString());
+}
+
+
+
+
+
+std::pair<bool, AString> cUrlParser::Parse(
+ const AString & a_Url,
+ AString & a_Scheme,
+ AString & a_Username,
+ AString & a_Password,
+ AString & a_Host,
+ UInt16 & a_Port,
+ AString & a_Path,
+ AString & a_Query,
+ AString & a_Fragment
+)
+{
+ // Find the scheme - the text before the first colon:
+ auto idxColon = a_Url.find(':');
+ if (idxColon == AString::npos)
+ {
+ return std::make_pair(false, "Cannot parse the Scheme part of the URL");
+ }
+ a_Scheme = StrToLower(a_Url.substr(0, idxColon));
+ a_Port = GetDefaultPort(a_Scheme);
+ if (a_Port == 0)
+ {
+ return std::make_pair(false, Printf("Unknown URL scheme: \"%s\"", a_Scheme.c_str()));
+ }
+
+ // If the next two chars are a double-slash, skip them:
+ auto authStart = idxColon + 1;
+ if (a_Url.substr(authStart, 2) == "//")
+ {
+ authStart += 2;
+ }
+
+ // The Authority part follows the Scheme, until the first slash:
+ auto idxFirstSlash = a_Url.find('/', authStart + 1);
+ if (idxFirstSlash == AString::npos)
+ {
+ // No slash, the whole end of the Url is the authority part
+ idxFirstSlash = a_Url.size();
+ }
+
+ // Parse the Authority part into individual components:
+ auto res = ParseAuthorityPart(
+ a_Url.substr(authStart, idxFirstSlash - authStart),
+ a_Username, a_Password,
+ a_Host, a_Port
+ );
+ if (!res.first)
+ {
+ return res;
+ }
+
+ // Parse the rest into a path, query and fragment:
+ a_Path.clear();
+ a_Query.clear();
+ a_Fragment.clear();
+ if (idxFirstSlash == a_Url.size())
+ {
+ // No additional data, bail out with success
+ return std::make_pair(true, AString());
+ }
+ auto idxPathEnd = a_Url.find_first_of("?#", idxFirstSlash + 1);
+ if (idxPathEnd == AString::npos)
+ {
+ a_Path = a_Url.substr(idxFirstSlash);
+ return std::make_pair(true, AString());
+ }
+ a_Path = a_Url.substr(idxFirstSlash, idxPathEnd - idxFirstSlash);
+ auto idxHash = a_Url.find('#', idxPathEnd);
+ if (idxHash == AString::npos)
+ {
+ a_Query = a_Url.substr(idxPathEnd + 1);
+ return std::make_pair(true, AString());
+ }
+ if (idxHash > idxPathEnd)
+ {
+ a_Query = a_Url.substr(idxPathEnd + 1, idxHash - idxPathEnd - 1);
+ }
+ a_Fragment = a_Url.substr(idxHash + 1);
+ return std::make_pair(true, AString());
+}
+
+
+
+
+