Created basic cHTTPFormParser.

It can parse forms in the application/x-www-form-urlencoded encoding, used for forms without file uploads.

VC2008/MCServer.vcproj

@@ -2727,6 +2727,14 @@
 					RelativePath="..\source\HTTPServer\HTTPConnection.h"
 					>
 				</File>
+				<File
+					RelativePath="..\source\HTTPServer\HTTPFormParser.cpp"
+					>
+				</File>
+				<File
+					RelativePath="..\source\HTTPServer\HTTPFormParser.h"
+					>
+				</File>
 				<File
 					RelativePath="..\source\HTTPServer\HTTPMessage.cpp"
 					>

source/HTTPServer/HTTPFormParser.cpp

@@ -0,0 +1,211 @@
+
+// HTTPFormParser.cpp
+
+// Implements the cHTTPFormParser class representing a parser for forms sent over HTTP
+
+#include "Globals.h"
+#include "HTTPFormParser.h"
+#include "HTTPMessage.h"
+
+
+
+
+
+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() == "application/x-www-form-urlencoded")
+		{
+			m_Kind = fpkFormUrlEncoded;
+			return;
+		}
+		if (a_Request.GetContentType() == "multipart/form-data")
+		{
+			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)
+{
+	return (
+		(a_Request.GetContentType() == "application/x-www-form-urlencoded") ||
+		(a_Request.GetContentType() == "multipart/form-data") ||
+		(
+			(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();
+	
+	/*
+	size_t len = m_IncomingData.size();
+	if (len == 0)
+	{
+		// No values in the form, consider this valid, too.
+		return;
+	}
+	size_t len1 = len - 1;
+
+	for (size_t i = 0; i < len; )
+	{
+		char ch = m_IncomingData[i];
+		AString Name;
+		AString Value;
+		while ((i < len1) && (ch != '=') && (ch != '&'))
+		{
+			if (ch == '+')
+			{
+				ch = ' ';
+			}
+			Name.push_back(ch);
+			ch = m_IncomingData[++i];
+		}
+		if (i == len1)
+		{
+			Value.push_back(ch);
+		}
+		
+		if (ch == '=')
+		{
+			ch = m_IncomingData[++i];
+			while ((i < len1) && (ch != '&'))
+			{
+				if (ch == '+')
+				{
+					ch = ' ';
+				}
+				Value.push_back(ch);
+				ch = m_IncomingData[++i];
+			}
+			if (i == len1)
+			{
+				Value.push_back(ch);
+			}
+		}
+		(*this)[URLDecode(Name)] = URLDecode(Value);
+		if (ch == '&')
+		{
+			++i;
+		}
+	}  // for i - m_IncomingData[]
+	*/
+}
+
+
+
+
+
+void cHTTPFormParser::ParseMultipart(void)
+{
+	// TODO
+}
+
+
+
+

source/HTTPServer/HTTPFormParser.h

@@ -0,0 +1,64 @@
+
+// HTTPFormParser.h
+
+// Declares the cHTTPFormParser class representing a parser for forms sent over HTTP
+
+
+
+
+#pragma once
+
+
+
+
+
+// fwd:
+class cHTTPRequest;
+
+
+
+
+
+class cHTTPFormParser :
+	public std::map<AString, AString>
+{
+public:
+	cHTTPFormParser(cHTTPRequest & a_Request);
+	
+	/// Adds more data into the parser, as the request body is received
+	void Parse(const char * a_Data, int a_Size);
+	
+	/** Notifies that there's no more data incoming and the parser should finish its parsing.
+	Returns true if parsing successful
+	*/
+	bool Finish(void);
+	
+	/// Returns true if the headers suggest the request has form data parseable by this class
+	static bool HasFormData(const cHTTPRequest & a_Request);
+	
+protected:
+	enum eKind
+	{
+		fpkURL,             ///< The form has been transmitted as parameters to a GET request
+		fpkFormUrlEncoded,  ///< The form has been POSTed or PUT, with Content-Type of "application/x-www-form-urlencoded"
+		fpkMultipart,       ///< The form has been POSTed or PUT, with Content-Type of "multipart/*". Currently unsupported
+	};
+
+	/// The kind of the parser (decided in the constructor, used in Parse()
+	eKind m_Kind;
+	
+	AString m_IncomingData;
+	
+	bool m_IsValid;
+		
+	
+	/// Parses m_IncomingData as form-urlencoded data (fpkURL or fpkFormUrlEncoded kinds)
+	void ParseFormUrlEncoded(void);
+	
+	/// Parses m_IncomingData as multipart data (fpkMultipart kind)
+	void ParseMultipart(void);
+} ;
+
+
+
+

source/HTTPServer/HTTPMessage.cpp

@@ -99,6 +99,7 @@ bool cHTTPRequest::ParseHeaders(const char * a_IncomingData, size_t a_IdxEnd)
 
 
 
+
 size_t cHTTPRequest::ParseRequestLine(const char * a_Data, size_t a_IdxEnd)
 {	
 	// Ignore the initial CRLFs (HTTP spec's "should")

source/HTTPServer/HTTPMessage.h

@@ -71,6 +71,12 @@ public:
 	/// Returns true if the request did contain a Content-Length header
 	bool HasReceivedContentLength(void) const { return (m_ContentLength >= 0); }
 	
+	/// Returns the method used in the request
+	const AString & GetMethod(void) const { return m_Method; }
+	
+	/// Returns the URL used in the request
+	const AString & GetURL(void) const { return m_URL; }
+	
 	/// Sets the UserData pointer that is stored within this request. The request doesn't touch this data (doesn't delete it)!
 	void SetUserData(void * a_UserData) { m_UserData = a_UserData; }
 	

source/HTTPServer/HTTPServer.cpp

@@ -7,6 +7,7 @@
 #include "HTTPServer.h"
 #include "HTTPMessage.h"
 #include "HTTPConnection.h"
+#include "HTTPFormParser.h"
 
 
 
@@ -27,18 +28,49 @@ class cDebugCallbacks :
 {
 		virtual void OnRequestBegun(cHTTPConnection & a_Connection, cHTTPRequest & a_Request) override
 		{
-			// Nothing needed
+			if (cHTTPFormParser::HasFormData(a_Request))
+			{
+				a_Request.SetUserData(new cHTTPFormParser(a_Request));
+			}
 		}
 		
 		
 		virtual void OnRequestBody(cHTTPConnection & a_Connection, cHTTPRequest & a_Request, const char * a_Data, int a_Size) override
 		{
-			// TODO
+			cHTTPFormParser * FormParser = (cHTTPFormParser *)(a_Request.GetUserData());
+			if (FormParser != NULL)
+			{
+				FormParser->Parse(a_Data, a_Size);
+			}
 		}
 		
 		
 		virtual void OnRequestFinished(cHTTPConnection & a_Connection, cHTTPRequest & a_Request) override
 		{
+			cHTTPFormParser * FormParser = (cHTTPFormParser *)(a_Request.GetUserData());
+			if (FormParser != NULL)
+			{
+				if (FormParser->Finish())
+				{
+					cHTTPResponse Resp;
+					Resp.SetContentType("text/html");
+					a_Connection.Send(Resp);
+					a_Connection.Send("<html><body><table border=1 cellspacing=0><tr><th>Name</th><th>Value</th></tr>\r\n");
+					for (cHTTPFormParser::iterator itr = FormParser->begin(), end = FormParser->end(); itr != end; ++itr)
+					{
+						a_Connection.Send(Printf("<tr><td valign=\"top\"><pre>%s</pre></td><td valign=\"top\"><pre>%s</pre></td></tr>\r\n", itr->first.c_str(), itr->second.c_str()));
+					}  // for itr - FormParser[]
+					a_Connection.Send("</table></body></html>");
+					return;
+				}
+				
+				// Parsing failed:
+				cHTTPResponse Resp;
+				Resp.SetContentType("text/plain");
+				a_Connection.Send(Resp);
+				a_Connection.Send("Form parsing failed");
+			}
+			
 			cHTTPResponse Resp;
 			Resp.SetContentType("text/plain");
 			a_Connection.Send(Resp);