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authormadmaxoft <github@xoft.cz>2013-09-27 18:14:26 +0200
committermadmaxoft <github@xoft.cz>2013-09-27 18:14:26 +0200
commitf4efcb90808603bbfce5a149f5490bd6fceb880f (patch)
tree34c68b8364077ed37e9c73bfc88003eb0a821b50 /source/HTTPServer/HTTPMessage.cpp
parentImplemented basic HTTP message header parsing. (diff)
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Diffstat (limited to '')
-rw-r--r--source/HTTPServer/HTTPMessage.cpp285
1 files changed, 285 insertions, 0 deletions
diff --git a/source/HTTPServer/HTTPMessage.cpp b/source/HTTPServer/HTTPMessage.cpp
new file mode 100644
index 000000000..b784cb941
--- /dev/null
+++ b/source/HTTPServer/HTTPMessage.cpp
@@ -0,0 +1,285 @@
+
+// HTTPMessage.cpp
+
+// Declares the cHTTPMessage class representing the common ancestor for HTTP request and response classes
+
+#include "Globals.h"
+#include "HTTPMessage.h"
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cHTTPMessage:
+
+cHTTPMessage::cHTTPMessage(eKind a_Kind) :
+ m_Kind(a_Kind)
+{
+}
+
+
+
+
+
+void cHTTPMessage::AddHeader(const AString & a_Key, const AString & a_Value)
+{
+ cNameValueMap::iterator itr = m_Headers.find(a_Key);
+ if (itr == m_Headers.end())
+ {
+ m_Headers[a_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 (a_Key == "Content-Type")
+ {
+ m_ContentType = m_Headers["Content-Type"];
+ }
+ else if (a_Key == "Content-Length")
+ {
+ m_ContentLength = atoi(m_Headers["Content-Length"].c_str());
+ }
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cHTTPRequest:
+
+cHTTPRequest::cHTTPRequest(void) :
+ super(mkRequest)
+{
+}
+
+
+
+
+
+bool cHTTPRequest::ParseHeaders(const char * a_IncomingData, size_t a_IdxEnd)
+{
+ // The first line contains the method and the URL:
+ size_t Next = ParseRequestLine(a_IncomingData, a_IdxEnd);
+ if (Next == AString::npos)
+ {
+ return false;
+ }
+
+ // The following lines contain headers:
+ AString Key;
+ const char * Data = a_IncomingData + Next;
+ size_t End = a_IdxEnd - Next;
+ while (End > 0)
+ {
+ Next = ParseHeaderField(Data, End, Key);
+ if (Next == AString::npos)
+ {
+ return false;
+ }
+ ASSERT(End >= Next);
+ Data += Next;
+ End -= Next;
+ }
+
+ return HasReceivedContentLength();
+}
+
+
+
+
+size_t cHTTPRequest::ParseRequestLine(const char * a_Data, size_t a_IdxEnd)
+{
+ // Ignore the initial CRLFs (HTTP spec's "should")
+ size_t LineStart = 0;
+ while (
+ (LineStart < a_IdxEnd) &&
+ (
+ (a_Data[LineStart] == '\r') ||
+ (a_Data[LineStart] == '\n')
+ )
+ )
+ {
+ LineStart++;
+ }
+ if (LineStart >= a_IdxEnd)
+ {
+ return AString::npos;
+ }
+
+ size_t Last = LineStart;
+ int NumSpaces = 0;
+ for (size_t i = LineStart; i < a_IdxEnd; i++)
+ {
+ switch (a_Data[i])
+ {
+ case ' ':
+ {
+ switch (NumSpaces)
+ {
+ case 0:
+ {
+ m_Method.assign(a_Data, Last, i - Last - 1);
+ break;
+ }
+ case 1:
+ {
+ m_URL.assign(a_Data, Last, i - Last - 1);
+ break;
+ }
+ default:
+ {
+ // Too many spaces in the request
+ return AString::npos;
+ }
+ }
+ Last = i + 1;
+ NumSpaces += 1;
+ break;
+ }
+ case '\n':
+ {
+ if ((i == 0) || (a_Data[i] != '\r') || (NumSpaces != 2) || (i < Last + 7))
+ {
+ // LF too early, without a CR, without two preceeding spaces or too soon after the second space
+ return AString::npos;
+ }
+ // Check that there's HTTP/version at the end
+ if (strncmp(a_Data + Last, "HTTP/1.", 7) != 0)
+ {
+ return AString::npos;
+ }
+ return i;
+ }
+ } // switch (a_Data[i])
+ } // for i - a_Data[]
+ return AString::npos;
+}
+
+
+
+
+
+size_t cHTTPRequest::ParseHeaderField(const char * a_Data, size_t a_IdxEnd, AString & a_Key)
+{
+ if (*a_Data <= ' ')
+ {
+ size_t res = ParseHeaderFieldContinuation(a_Data + 1, a_IdxEnd - 1, a_Key);
+ return (res == AString::npos) ? res : (res + 1);
+ }
+ size_t ValueIdx = 0;
+ AString Key;
+ for (size_t i = 0; i < a_IdxEnd; i++)
+ {
+ switch (a_Data[i])
+ {
+ case '\n':
+ {
+ if ((ValueIdx == 0) || (i < ValueIdx - 2) || (i == 0) || (a_Data[i - 1] != '\r'))
+ {
+ // Invalid header field - no colon or no CR before LF
+ return AString::npos;
+ }
+ AString Value(a_Data, ValueIdx + 1, i - ValueIdx - 2);
+ AddHeader(Key, Value);
+ a_Key = Key;
+ return i + 1;
+ }
+ case ':':
+ {
+ if (ValueIdx == 0)
+ {
+ Key.assign(a_Data, 0, i);
+ ValueIdx = i;
+ }
+ break;
+ }
+ case ' ':
+ case '\t':
+ {
+ if (ValueIdx == i - 1)
+ {
+ // Value has started in this char, but it is whitespace, so move the start one char further
+ ValueIdx = i;
+ }
+ }
+ } // switch (char)
+ } // for i - m_IncomingHeaderData[]
+ // No header found, return the end-of-data index:
+ return a_IdxEnd;
+}
+
+
+
+
+
+size_t cHTTPRequest::ParseHeaderFieldContinuation(const char * a_Data, size_t a_IdxEnd, AString & a_Key)
+{
+ size_t Start = 0;
+ for (size_t i = 0; i < a_IdxEnd; i++)
+ {
+ if ((a_Data[i] > ' ') && (Start == 0))
+ {
+ Start = i;
+ }
+ else if (a_Data[i] == '\n')
+ {
+ if ((i == 0) || (a_Data[i - 1] != '\r'))
+ {
+ // There wasn't a CR before this LF
+ return AString::npos;
+ }
+ AString Value(a_Data, 0, i - Start - 1);
+ AddHeader(a_Key, Value);
+ return i + 1;
+ }
+ }
+ // LF not found, how? We found it at the header end (CRLFCRLF)
+ ASSERT(!"LF not found, wtf?");
+ return AString::npos;
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cHTTPResponse:
+
+cHTTPResponse::cHTTPResponse(void) :
+ super(mkResponse)
+{
+}
+
+
+
+
+
+void cHTTPResponse::AppendToData(AString & a_DataStream) const
+{
+ a_DataStream.append("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");
+}
+
+
+
+