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// HTTPMessage.cpp
// Declares the cHTTPMessage class representing the common ancestor for HTTP request and response classes
#include "Globals.h"
#include "HTTPMessage.h"
// Disable MSVC warnings:
#if defined(_MSC_VER)
#pragma warning(push)
#pragma warning(disable:4355) // 'this' : used in base member initializer list
#endif
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cHTTPMessage:
cHTTPMessage::cHTTPMessage(eKind a_Kind) :
m_Kind(a_Kind),
m_ContentLength(-1)
{
}
void cHTTPMessage::AddHeader(const AString & a_Key, const AString & a_Value)
{
AString Key = a_Key;
StrToLower(Key);
cNameValueMap::iterator itr = m_Headers.find(Key);
if (itr == m_Headers.end())
{
m_Headers[Key] = a_Value;
}
else
{
// The header-field key is specified multiple times, combine into comma-separated list (RFC 2616 @ 4.2)
itr->second.append(", ");
itr->second.append(a_Value);
}
// Special processing for well-known headers:
if (Key == "content-type")
{
m_ContentType = m_Headers[Key];
}
else if (Key == "content-length")
{
m_ContentLength = atoi(m_Headers[Key].c_str());
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cHTTPRequest:
cHTTPRequest::cHTTPRequest(void) :
super(mkRequest),
m_EnvelopeParser(*this),
m_IsValid(true),
m_UserData(NULL)
{
}
int cHTTPRequest::ParseHeaders(const char * a_Data, int a_Size)
{
if (!m_IsValid)
{
return -1;
}
if (m_Method.empty())
{
// The first line hasn't been processed yet
int res = ParseRequestLine(a_Data, a_Size);
if ((res < 0) || (res == a_Size))
{
return res;
}
int res2 = m_EnvelopeParser.Parse(a_Data + res, a_Size - res);
if (res2 < 0)
{
m_IsValid = false;
return res2;
}
return res2 + res;
}
if (m_EnvelopeParser.IsInHeaders())
{
int res = m_EnvelopeParser.Parse(a_Data, a_Size);
if (res < 0)
{
m_IsValid = false;
}
return res;
}
return 0;
}
int cHTTPRequest::ParseRequestLine(const char * a_Data, int a_Size)
{
m_IncomingHeaderData.append(a_Data, a_Size);
size_t IdxEnd = m_IncomingHeaderData.size();
// Ignore the initial CRLFs (HTTP spec's "should")
size_t LineStart = 0;
while (
(LineStart < IdxEnd) &&
(
(m_IncomingHeaderData[LineStart] == '\r') ||
(m_IncomingHeaderData[LineStart] == '\n')
)
)
{
LineStart++;
}
if (LineStart >= IdxEnd)
{
m_IsValid = false;
return -1;
}
int NumSpaces = 0;
size_t MethodEnd = 0;
size_t URLEnd = 0;
for (size_t i = LineStart; i < IdxEnd; i++)
{
switch (m_IncomingHeaderData[i])
{
case ' ':
{
switch (NumSpaces)
{
case 0:
{
MethodEnd = i;
break;
}
case 1:
{
URLEnd = i;
break;
}
default:
{
// Too many spaces in the request
m_IsValid = false;
return -1;
}
}
NumSpaces += 1;
break;
}
case '\n':
{
if ((i == 0) || (m_IncomingHeaderData[i - 1] != '\r') || (NumSpaces != 2) || (i < URLEnd + 7))
{
// LF too early, without a CR, without two preceeding spaces or too soon after the second space
m_IsValid = false;
return -1;
}
// Check that there's HTTP/version at the end
if (strncmp(a_Data + URLEnd + 1, "HTTP/1.", 7) != 0)
{
m_IsValid = false;
return -1;
}
m_Method = m_IncomingHeaderData.substr(LineStart, MethodEnd - LineStart);
m_URL = m_IncomingHeaderData.substr(MethodEnd + 1, URLEnd - MethodEnd - 1);
return i + 1;
}
} // switch (m_IncomingHeaderData[i])
} // for i - m_IncomingHeaderData[]
// CRLF hasn't been encountered yet, consider all data consumed
return a_Size;
}
void cHTTPRequest::OnHeaderLine(const AString & a_Key, const AString & a_Value)
{
AddHeader(a_Key, a_Value);
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cHTTPResponse:
cHTTPResponse::cHTTPResponse(void) :
super(mkResponse)
{
}
void cHTTPResponse::AppendToData(AString & a_DataStream) const
{
a_DataStream.append("HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\nContent-Type: ");
a_DataStream.append(m_ContentType);
a_DataStream.append("\r\n");
for (cNameValueMap::const_iterator itr = m_Headers.begin(), end = m_Headers.end(); itr != end; ++itr)
{
if ((itr->first == "Content-Type") || (itr->first == "Content-Length"))
{
continue;
}
a_DataStream.append(itr->first);
a_DataStream.append(": ");
a_DataStream.append(itr->second);
a_DataStream.append("\r\n");
} // for itr - m_Headers[]
a_DataStream.append("\r\n");
}
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