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authormadmaxoft <github@xoft.cz>2013-10-04 09:30:15 +0200
committermadmaxoft <github@xoft.cz>2013-10-04 13:10:30 +0200
commitd8229a55316183b523c61f28f88d64e6c8f3a96a (patch)
tree6971c74a08f6e01ab22bc08e849fa3bb987fa3bd
parentAdded cNameValueParser. (diff)
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Diffstat (limited to '')
-rw-r--r--source/HTTPServer/EnvelopeParser.cpp132
-rw-r--r--source/HTTPServer/EnvelopeParser.h69
-rw-r--r--source/HTTPServer/MultipartParser.cpp255
-rw-r--r--source/HTTPServer/MultipartParser.h76
4 files changed, 532 insertions, 0 deletions
diff --git a/source/HTTPServer/EnvelopeParser.cpp b/source/HTTPServer/EnvelopeParser.cpp
new file mode 100644
index 000000000..8dbe05f14
--- /dev/null
+++ b/source/HTTPServer/EnvelopeParser.cpp
@@ -0,0 +1,132 @@
+
+// EnvelopeParser.cpp
+
+// Implements the cEnvelopeParser class representing a parser for RFC-822 envelope headers, used both in HTTP and in MIME
+
+#include "Globals.h"
+#include "EnvelopeParser.h"
+
+
+
+
+
+cEnvelopeParser::cEnvelopeParser(cCallbacks & a_Callbacks) :
+ m_Callbacks(a_Callbacks),
+ m_IsInHeaders(true)
+{
+}
+
+
+
+
+
+int cEnvelopeParser::Parse(const char * a_Data, int a_Size)
+{
+ if (!m_IsInHeaders)
+ {
+ return 0;
+ }
+
+ // Start searching 1 char from the end of the already received data, if available:
+ size_t SearchStart = m_IncomingData.size();
+ SearchStart = (SearchStart > 1) ? SearchStart - 1 : 0;
+
+ m_IncomingData.append(a_Data, a_Size);
+
+ size_t idxCRLF = m_IncomingData.find("\r\n", SearchStart);
+ if (idxCRLF == AString::npos)
+ {
+ // Not a complete line yet, all input consumed:
+ return a_Size;
+ }
+
+ // Parse as many lines as found:
+ size_t Last = 0;
+ do
+ {
+ if (idxCRLF == Last)
+ {
+ // This was the last line of the data. Finish whatever value has been cached and return:
+ NotifyLast();
+ m_IsInHeaders = false;
+ return a_Size - (m_IncomingData.size() - idxCRLF) + 2;
+ }
+ if (!ParseLine(m_IncomingData.c_str() + Last, idxCRLF - Last))
+ {
+ // An error has occurred
+ m_IsInHeaders = false;
+ return -1;
+ }
+ Last = idxCRLF + 2;
+ idxCRLF = m_IncomingData.find("\r\n", idxCRLF + 2);
+ } while (idxCRLF != AString::npos);
+ m_IncomingData.erase(0, Last);
+
+ // Parsed all lines and still expecting more
+ return a_Size;
+}
+
+
+
+
+
+void cEnvelopeParser::Reset(void)
+{
+ m_IsInHeaders = true;
+ m_IncomingData.clear();
+ m_LastKey.clear();
+ m_LastValue.clear();
+}
+
+
+
+
+
+void cEnvelopeParser::NotifyLast(void)
+{
+ if (!m_LastKey.empty())
+ {
+ m_Callbacks.OnHeaderLine(m_LastKey, m_LastValue);
+ m_LastKey.clear();
+ }
+ m_LastValue.clear();
+}
+
+
+
+
+
+bool cEnvelopeParser::ParseLine(const char * a_Data, size_t a_Size)
+{
+ ASSERT(a_Size > 0);
+ if (a_Data[0] <= ' ')
+ {
+ // This line is a continuation for the previous line
+ if (m_LastKey.empty())
+ {
+ return false;
+ }
+ // Append, including the whitespace in a_Data[0]
+ m_LastValue.append(a_Data, a_Size);
+ return true;
+ }
+
+ // This is a line with a new key:
+ NotifyLast();
+ for (size_t i = 0; i < a_Size; i++)
+ {
+ if (a_Data[i] == ':')
+ {
+ m_LastKey.assign(a_Data, i);
+ m_LastValue.assign(a_Data + i + 2, a_Size - i - 2);
+ return true;
+ }
+ } // for i - a_Data[]
+
+ // No colon was found, key-less header??
+ return false;
+}
+
+
+
+
diff --git a/source/HTTPServer/EnvelopeParser.h b/source/HTTPServer/EnvelopeParser.h
new file mode 100644
index 000000000..6430fbebf
--- /dev/null
+++ b/source/HTTPServer/EnvelopeParser.h
@@ -0,0 +1,69 @@
+
+// EnvelopeParser.h
+
+// Declares the cEnvelopeParser class representing a parser for RFC-822 envelope headers, used both in HTTP and in MIME
+
+
+
+
+
+#pragma once
+
+
+
+
+
+class cEnvelopeParser
+{
+public:
+ class cCallbacks
+ {
+ public:
+ /// Called when a full header line is parsed
+ virtual void OnHeaderLine(const AString & a_Key, const AString & a_Value) = 0;
+ } ;
+
+
+ cEnvelopeParser(cCallbacks & a_Callbacks);
+
+ /** Parses the incoming data.
+ Returns the number of bytes consumed from the input. The bytes not consumed are not part of the envelope header
+ */
+ int Parse(const char * a_Data, int a_Size);
+
+ /// Makes the parser forget everything parsed so far, so that it can be reused for parsing another datastream
+ void Reset(void);
+
+ /// Returns true if more input is expected for the envelope header
+ bool IsInHeaders(void) const { return m_IsInHeaders; }
+
+ /// Sets the IsInHeaders flag; used by cMultipartParser to simplify the parser initial conditions
+ void SetIsInHeaders(bool a_IsInHeaders) { m_IsInHeaders = a_IsInHeaders; }
+
+public:
+ /// Callbacks to call for the various events
+ cCallbacks & m_Callbacks;
+
+ /// Set to true while the parser is still parsing the envelope headers. Once set to true, the parser will not consume any more data.
+ bool m_IsInHeaders;
+
+ /// Buffer for the incoming data until it is parsed
+ AString m_IncomingData;
+
+ /// Holds the last parsed key; used for line-wrapped values
+ AString m_LastKey;
+
+ /// Holds the last parsed value; used for line-wrapped values
+ AString m_LastValue;
+
+
+ /// Notifies the callback of the key/value stored in m_LastKey/m_LastValue, then erases them
+ void NotifyLast(void);
+
+ /// Parses one line of header data. Returns true if successful
+ bool ParseLine(const char * a_Data, size_t a_Size);
+} ;
+
+
+
+
diff --git a/source/HTTPServer/MultipartParser.cpp b/source/HTTPServer/MultipartParser.cpp
new file mode 100644
index 000000000..7df151dc3
--- /dev/null
+++ b/source/HTTPServer/MultipartParser.cpp
@@ -0,0 +1,255 @@
+
+// MultipartParser.cpp
+
+// Implements the cMultipartParser class that parses messages in "multipart/*" encoding into the separate parts
+
+#include "Globals.h"
+#include "MultipartParser.h"
+#include "NameValueParser.h"
+
+
+
+
+
+// Disable MSVC warnings:
+#if defined(_MSC_VER)
+ #pragma warning(push)
+ #pragma warning(disable:4355) // 'this' : used in base member initializer list
+#endif
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// self-test:
+
+#if 0
+
+class cMultipartParserTest :
+ public cMultipartParser::cCallbacks
+{
+public:
+ cMultipartParserTest(void)
+ {
+ cMultipartParser Parser("multipart/mixed; boundary=\"MyBoundaryString\"; foo=bar", *this);
+ const char Data[] =
+"ThisIsIgnoredPrologue\r\n\
+--MyBoundaryString\r\n\
+\r\n\
+Body with confusing strings\r\n\
+--NotABoundary\r\n\
+--MyBoundaryStringWithPostfix\r\n\
+--\r\n\
+--MyBoundaryString\r\n\
+content-disposition: inline\r\n\
+\r\n\
+This is body\r\n\
+--MyBoundaryString\r\n\
+\r\n\
+Headerless body with trailing CRLF\r\n\
+\r\n\
+--MyBoundaryString--\r\n\
+ThisIsIgnoredEpilogue";
+ printf("Multipart parsing test commencing.\n");
+ Parser.Parse(Data, sizeof(Data) - 1);
+ // DEBUG: Check if the onscreen output corresponds with the data above
+ printf("Multipart parsing test finished\n");
+ }
+
+ virtual void OnPartStart(void) override
+ {
+ printf("Starting a new part\n");
+ }
+
+
+ virtual void OnPartHeader(const AString & a_Key, const AString & a_Value) override
+ {
+ printf(" Hdr: \"%s\"=\"%s\"\n", a_Key.c_str(), a_Value.c_str());
+ }
+
+
+ virtual void OnPartData(const char * a_Data, int a_Size) override
+ {
+ printf(" Data: %d bytes, \"%.*s\"\n", a_Size, a_Size, a_Data);
+ }
+
+
+ virtual void OnPartEnd(void) override
+ {
+ printf("Part end\n");
+ }
+} g_Test;
+
+#endif
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cMultipartParser:
+
+
+cMultipartParser::cMultipartParser(const AString & a_ContentType, cCallbacks & a_Callbacks) :
+ m_Callbacks(a_Callbacks),
+ m_IsValid(true),
+ m_EnvelopeParser(*this),
+ m_HasHadData(false)
+{
+ static AString s_Multipart = "multipart/";
+
+ // Check that the content type is multipart:
+ AString ContentType(a_ContentType);
+ if (strncmp(ContentType.c_str(), "multipart/", 10) != 0)
+ {
+ m_IsValid = false;
+ return;
+ }
+ size_t idxSC = ContentType.find(';', 10);
+ if (idxSC == AString::npos)
+ {
+ m_IsValid = false;
+ return;
+ }
+
+ // Find the multipart boundary:
+ ContentType.erase(0, idxSC + 1);
+ cNameValueParser CTParser(ContentType.c_str(), ContentType.size());
+ if (!CTParser.IsValid())
+ {
+ m_IsValid = false;
+ return;
+ }
+ m_Boundary = CTParser["boundary"];
+ m_IsValid = !m_Boundary.empty();
+ if (!m_IsValid)
+ {
+ return;
+ }
+
+ // Set the envelope parser for parsing the body, so that our Parse() function parses the ignored prefix data as a body
+ m_EnvelopeParser.SetIsInHeaders(false);
+
+ // Append an initial CRLF to the incoming data, so that a body starting with the boundary line will get caught
+ m_IncomingData.assign("\r\n");
+
+ /*
+ m_Boundary = AString("\r\n--") + m_Boundary
+ m_BoundaryEnd = m_Boundary + "--\r\n";
+ m_Boundary = m_Boundary + "\r\n";
+ */
+}
+
+
+
+
+
+void cMultipartParser::Parse(const char * a_Data, int a_Size)
+{
+ // Skip parsing if invalid
+ if (!m_IsValid)
+ {
+ return;
+ }
+
+ // Append to buffer, then parse it:
+ m_IncomingData.append(a_Data, a_Size);
+ while (true)
+ {
+ if (m_EnvelopeParser.IsInHeaders())
+ {
+ int BytesConsumed = m_EnvelopeParser.Parse(m_IncomingData.data(), m_IncomingData.size());
+ if (BytesConsumed < 0)
+ {
+ m_IsValid = false;
+ return;
+ }
+ if ((BytesConsumed == a_Size) && m_EnvelopeParser.IsInHeaders())
+ {
+ // All the incoming data has been consumed and still waiting for more
+ return;
+ }
+ m_IncomingData.erase(0, BytesConsumed);
+ }
+
+ // Search for boundary / boundary end:
+ size_t idxBoundary = m_IncomingData.find("\r\n--");
+ if (idxBoundary == AString::npos)
+ {
+ // Boundary string start not present, present as much data to the part callback as possible
+ if (m_IncomingData.size() > m_Boundary.size() + 8)
+ {
+ size_t BytesToReport = m_IncomingData.size() - m_Boundary.size() - 8;
+ m_Callbacks.OnPartData(m_IncomingData.data(), BytesToReport);
+ m_IncomingData.erase(0, BytesToReport);
+ }
+ return;
+ }
+ if (idxBoundary > 0)
+ {
+ m_Callbacks.OnPartData(m_IncomingData.data(), idxBoundary);
+ m_IncomingData.erase(0, idxBoundary);
+ }
+ idxBoundary = 4;
+ size_t LineEnd = m_IncomingData.find("\r\n", idxBoundary);
+ if (LineEnd == AString::npos)
+ {
+ // Not a complete line yet, present as much data to the part callback as possible
+ if (m_IncomingData.size() > m_Boundary.size() + 8)
+ {
+ size_t BytesToReport = m_IncomingData.size() - m_Boundary.size() - 8;
+ m_Callbacks.OnPartData(m_IncomingData.data(), BytesToReport);
+ m_IncomingData.erase(0, BytesToReport);
+ }
+ return;
+ }
+ if (
+ (LineEnd - idxBoundary != m_Boundary.size()) && // Line length not equal to boundary
+ (LineEnd - idxBoundary != m_Boundary.size() + 2) // Line length not equal to boundary end
+ )
+ {
+ // Got a line, but it's not a boundary, report it as data:
+ m_Callbacks.OnPartData(m_IncomingData.data(), LineEnd);
+ m_IncomingData.erase(0, LineEnd);
+ continue;
+ }
+
+ if (strncmp(m_IncomingData.c_str() + idxBoundary, m_Boundary.c_str(), m_Boundary.size()) == 0)
+ {
+ // Boundary or BoundaryEnd found:
+ m_Callbacks.OnPartEnd();
+ size_t idxSlash = idxBoundary + m_Boundary.size();
+ if ((m_IncomingData[idxSlash] == '-') && (m_IncomingData[idxSlash + 1] == '-'))
+ {
+ // This was the last part
+ m_Callbacks.OnPartData(m_IncomingData.data() + idxSlash + 4, m_IncomingData.size() - idxSlash - 4);
+ m_IncomingData.clear();
+ return;
+ }
+ m_Callbacks.OnPartStart();
+ m_IncomingData.erase(0, LineEnd + 2);
+
+ // Keep parsing for the headers that may have come with this data:
+ m_EnvelopeParser.Reset();
+ continue;
+ }
+
+ // It's a line, but not a boundary. It can be fully sent to the data receiver, since a boundary cannot cross lines
+ m_Callbacks.OnPartData(m_IncomingData.c_str(), LineEnd);
+ m_IncomingData.erase(0, LineEnd);
+ } // while (true)
+}
+
+
+
+
+
+void cMultipartParser::OnHeaderLine(const AString & a_Key, const AString & a_Value)
+{
+ m_Callbacks.OnPartHeader(a_Key, a_Value);
+}
+
+
+
+
diff --git a/source/HTTPServer/MultipartParser.h b/source/HTTPServer/MultipartParser.h
new file mode 100644
index 000000000..d853929ed
--- /dev/null
+++ b/source/HTTPServer/MultipartParser.h
@@ -0,0 +1,76 @@
+
+// MultipartParser.h
+
+// Declares the cMultipartParser class that parses messages in "multipart/*" encoding into the separate parts
+
+
+
+
+
+#pragma once
+
+#include "EnvelopeParser.h"
+
+
+
+
+
+class cMultipartParser :
+ protected cEnvelopeParser::cCallbacks
+{
+public:
+ class cCallbacks
+ {
+ public:
+ /// Called when a new part starts
+ virtual void OnPartStart(void) = 0;
+
+ /// Called when a complete header line is received for a part
+ virtual void OnPartHeader(const AString & a_Key, const AString & a_Value) = 0;
+
+ /// Called when body for a part is received
+ virtual void OnPartData(const char * a_Data, int a_Size) = 0;
+
+ /// Called when the current part ends
+ virtual void OnPartEnd(void) = 0;
+ } ;
+
+ /// Creates the parser, expects to find the boundary in a_ContentType
+ cMultipartParser(const AString & a_ContentType, cCallbacks & a_Callbacks);
+
+ /// Parses more incoming data
+ void Parse(const char * a_Data, int a_Size);
+
+protected:
+ /// The callbacks to call for various parsing events
+ cCallbacks & m_Callbacks;
+
+ /// True if the data parsed so far is valid; if false, further parsing is skipped
+ bool m_IsValid;
+
+ /// Parser for each part's envelope
+ cEnvelopeParser m_EnvelopeParser;
+
+ /// Buffer for the incoming data until it is parsed
+ AString m_IncomingData;
+
+ /// The boundary, excluding both the initial "--" and the terminating CRLF
+ AString m_Boundary;
+
+ /// Set to true if some data for the current part has already been signalized to m_Callbacks. Used for proper CRLF inserting.
+ bool m_HasHadData;
+
+
+ /// Parse one line of incoming data. The CRLF has already been stripped from a_Data / a_Size
+ void ParseLine(const char * a_Data, int a_Size);
+
+ /// Parse one line of incoming data in the headers section of a part. The CRLF has already been stripped from a_Data / a_Size
+ void ParseHeaderLine(const char * a_Data, int a_Size);
+
+ // cEnvelopeParser overrides:
+ virtual void OnHeaderLine(const AString & a_Key, const AString & a_Value) override;
+} ;
+
+
+
+