net/quic/core/spdy_utils.cc - chromium/src - Git at Google

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "net/quic/core/spdy_utils.h"

 #include <memory>
 #include <vector>

 #include "net/quic/platform/api/quic_logging.h"
 #include "net/quic/platform/api/quic_map_util.h"
 #include "net/quic/platform/api/quic_text_utils.h"
 #include "net/quic/platform/api/quic_url_utils.h"
 #include "net/spdy/spdy_flags.h"
 #include "net/spdy/spdy_frame_builder.h"
 #include "net/spdy/spdy_framer.h"
 #include "net/spdy/spdy_protocol.h"

 using base::StringPiece;
 using std::string;

 namespace net {

 // static
 string SpdyUtils::SerializeUncompressedHeaders(const SpdyHeaderBlock& headers) {
   size_t length = SpdyFramer::GetSerializedLength(&headers);
   SpdyFrameBuilder builder(length);
   SpdyFramer framer(SpdyFramer::DISABLE_COMPRESSION);
   framer.SerializeHeaderBlockWithoutCompression(&builder, headers);
   SpdySerializedFrame block(builder.take());
   return string(block.data(), length);
 }

 // static
 bool SpdyUtils::ParseHeaders(const char* data,
                              uint32_t data_len,
                              int64_t* content_length,
                              SpdyHeaderBlock* headers) {
   SpdyFramer framer(SpdyFramer::ENABLE_COMPRESSION);
   if (!framer.ParseHeaderBlockInBuffer(data, data_len, headers) ||
       headers->empty()) {
     return false;  // Headers were invalid.
   }

   if (!QuicContainsKey(*headers, "content-length")) {
     return true;
   }

   return ExtractContentLengthFromHeaders(content_length, headers);
 }

 // static
 bool SpdyUtils::ExtractContentLengthFromHeaders(int64_t* content_length,
                                                 SpdyHeaderBlock* headers) {
   auto it = headers->find("content-length");
   if (it == headers->end()) {
     return false;
   } else {
     // Check whether multiple values are consistent.
     StringPiece content_length_header = it->second;
     std::vector<StringPiece> values =
         QuicTextUtils::Split(content_length_header, '\0');
     for (const StringPiece& value : values) {
       uint64_t new_value;
       if (!QuicTextUtils::StringToUint64(value, &new_value)) {
         QUIC_DLOG(ERROR)
             << "Content length was either unparseable or negative.";
         return false;
       }
       if (*content_length < 0) {
         *content_length = new_value;
         continue;
       }
       if (new_value != static_cast<uint64_t>(*content_length)) {
         QUIC_DLOG(ERROR)
             << "Parsed content length " << new_value << " is "
             << "inconsistent with previously detected content length "
             << *content_length;
         return false;
       }
     }
     return true;
   }
 }

 // static
 bool SpdyUtils::ParseTrailers(const char* data,
                               uint32_t data_len,
                               size_t* final_byte_offset,
                               SpdyHeaderBlock* trailers) {
   SpdyFramer framer(SpdyFramer::ENABLE_COMPRESSION);
   if (!framer.ParseHeaderBlockInBuffer(data, data_len, trailers) ||
       trailers->empty()) {
     QUIC_DVLOG(1) << "Request Trailers are invalid.";
     return false;  // Trailers were invalid.
   }

   // Pull out the final offset pseudo header which indicates the number of
   // response body bytes expected.
   auto it = trailers->find(kFinalOffsetHeaderKey);
   if (it == trailers->end() ||
       !QuicTextUtils::StringToSizeT(it->second, final_byte_offset)) {
     QUIC_DVLOG(1) << "Required key '" << kFinalOffsetHeaderKey
                   << "' not present";
     return false;
   }
   // The final offset header is no longer needed.
   trailers->erase(it->first);

   // Trailers must not have empty keys, and must not contain pseudo headers.
   for (const auto& trailer : *trailers) {
     StringPiece key = trailer.first;
     StringPiece value = trailer.second;
     if (QuicTextUtils::StartsWith(key, ":")) {
       QUIC_DVLOG(1) << "Trailers must not contain pseudo-header: '" << key
                     << "','" << value << "'.";
       return false;
     }

     // TODO(rjshade): Check for other forbidden keys, following the HTTP/2 spec.
   }

   QUIC_DVLOG(1) << "Successfully parsed Trailers: " << trailers->DebugString();
   return true;
 }

 bool SpdyUtils::CopyAndValidateHeaders(const QuicHeaderList& header_list,
                                        int64_t* content_length,
                                        SpdyHeaderBlock* headers) {
   for (const auto& p : header_list) {
     const string& name = p.first;
     if (name.empty()) {
       QUIC_DVLOG(1) << "Header name must not be empty.";
       return false;
     }

     if (QuicTextUtils::ContainsUpperCase(name)) {
       QUIC_DLOG(ERROR) << "Malformed header: Header name " << name
                        << " contains upper-case characters.";
       return false;
     }

     headers->AppendValueOrAddHeader(name, p.second);
   }

   if (QuicContainsKey(*headers, "content-length") &&
       !ExtractContentLengthFromHeaders(content_length, headers)) {
     return false;
   }

   QUIC_DVLOG(1) << "Successfully parsed headers: " << headers->DebugString();
   return true;
 }

 bool SpdyUtils::CopyAndValidateTrailers(const QuicHeaderList& header_list,
                                         size_t* final_byte_offset,
                                         SpdyHeaderBlock* trailers) {
   bool found_final_byte_offset = false;
   for (const auto& p : header_list) {
     const string& name = p.first;

     // Pull out the final offset pseudo header which indicates the number of
     // response body bytes expected.
     if (!found_final_byte_offset && name == kFinalOffsetHeaderKey &&
         QuicTextUtils::StringToSizeT(p.second, final_byte_offset)) {
       found_final_byte_offset = true;
       continue;
     }

     if (name.empty() || name[0] == ':') {
       QUIC_DVLOG(1)
           << "Trailers must not be empty, and must not contain pseudo-"
           << "headers. Found: '" << name << "'";
       return false;
     }

     if (QuicTextUtils::ContainsUpperCase(name)) {
       QUIC_DLOG(INFO) << "Malformed header: Header name " << name
                       << " contains upper-case characters.";
       return false;
     }

     if (trailers->find(name) != trailers->end()) {
       QUIC_DLOG(INFO) << "Duplicate header '" << name << "' found in trailers.";
       return false;
     }

     (*trailers)[name] = p.second;
   }

   if (!found_final_byte_offset) {
     QUIC_DVLOG(1) << "Required key '" << kFinalOffsetHeaderKey
                   << "' not present";
     return false;
   }

   // TODO(rjshade): Check for other forbidden keys, following the HTTP/2 spec.

   QUIC_DVLOG(1) << "Successfully parsed Trailers: " << trailers->DebugString();
   return true;
 }

 // static
 string SpdyUtils::GetUrlFromHeaderBlock(const SpdyHeaderBlock& headers) {
   SpdyHeaderBlock::const_iterator it = headers.find(":scheme");
   if (it == headers.end()) {
     return "";
   }
   std::string url = it->second.as_string();

   url.append("://");

   it = headers.find(":authority");
   if (it == headers.end()) {
     return "";
   }
   url.append(it->second.as_string());

   it = headers.find(":path");
   if (it == headers.end()) {
     return "";
   }
   url.append(it->second.as_string());
   return url;
 }

 // static
 string SpdyUtils::GetHostNameFromHeaderBlock(const SpdyHeaderBlock& headers) {
   // TODO(fayang): Consider just checking out the value of the ":authority" key
   // in headers.
   return QuicUrlUtils::HostName(GetUrlFromHeaderBlock(headers));
 }

 // static
 bool SpdyUtils::UrlIsValid(const SpdyHeaderBlock& headers) {
   string url(GetUrlFromHeaderBlock(headers));
   return url != "" && QuicUrlUtils::IsValidUrl(url);
 }

 // static
 bool SpdyUtils::PopulateHeaderBlockFromUrl(const string url,
                                            SpdyHeaderBlock* headers) {
   (*headers)[":method"] = "GET";
   size_t pos = url.find("://");
   if (pos == string::npos) {
     return false;
   }
   (*headers)[":scheme"] = url.substr(0, pos);
   size_t start = pos + 3;
   pos = url.find("/", start);
   if (pos == string::npos) {
     (*headers)[":authority"] = url.substr(start);
     (*headers)[":path"] = "/";
     return true;
   }
   (*headers)[":authority"] = url.substr(start, pos - start);
   (*headers)[":path"] = url.substr(pos);
   return true;
 }

 }  // namespace net
	// Copyright (c) 2013 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "net/quic/core/spdy_utils.h"

	#include <memory>
	#include <vector>

	#include "net/quic/platform/api/quic_logging.h"
	#include "net/quic/platform/api/quic_map_util.h"
	#include "net/quic/platform/api/quic_text_utils.h"
	#include "net/quic/platform/api/quic_url_utils.h"
	#include "net/spdy/spdy_flags.h"
	#include "net/spdy/spdy_frame_builder.h"
	#include "net/spdy/spdy_framer.h"
	#include "net/spdy/spdy_protocol.h"

	using base::StringPiece;
	using std::string;

	namespace net {

	// static
	string SpdyUtils::SerializeUncompressedHeaders(const SpdyHeaderBlock& headers) {
	size_t length = SpdyFramer::GetSerializedLength(&headers);
	SpdyFrameBuilder builder(length);
	SpdyFramer framer(SpdyFramer::DISABLE_COMPRESSION);
	framer.SerializeHeaderBlockWithoutCompression(&builder, headers);
	SpdySerializedFrame block(builder.take());
	return string(block.data(), length);
	}

	// static
	bool SpdyUtils::ParseHeaders(const char* data,
	uint32_t data_len,
	int64_t* content_length,
	SpdyHeaderBlock* headers) {
	SpdyFramer framer(SpdyFramer::ENABLE_COMPRESSION);
	if (!framer.ParseHeaderBlockInBuffer(data, data_len, headers) \|\|
	headers->empty()) {
	return false; // Headers were invalid.
	}

	if (!QuicContainsKey(*headers, "content-length")) {
	return true;
	}

	return ExtractContentLengthFromHeaders(content_length, headers);
	}

	// static
	bool SpdyUtils::ExtractContentLengthFromHeaders(int64_t* content_length,
	SpdyHeaderBlock* headers) {
	auto it = headers->find("content-length");
	if (it == headers->end()) {
	return false;
	} else {
	// Check whether multiple values are consistent.
	StringPiece content_length_header = it->second;
	std::vector<StringPiece> values =
	QuicTextUtils::Split(content_length_header, '\0');
	for (const StringPiece& value : values) {
	uint64_t new_value;
	if (!QuicTextUtils::StringToUint64(value, &new_value)) {
	QUIC_DLOG(ERROR)
	<< "Content length was either unparseable or negative.";
	return false;
	}
	if (*content_length < 0) {
	*content_length = new_value;
	continue;
	}
	if (new_value != static_cast<uint64_t>(*content_length)) {
	QUIC_DLOG(ERROR)
	<< "Parsed content length " << new_value << " is "
	<< "inconsistent with previously detected content length "
	<< *content_length;
	return false;
	}
	}
	return true;
	}
	}

	// static
	bool SpdyUtils::ParseTrailers(const char* data,
	uint32_t data_len,
	size_t* final_byte_offset,
	SpdyHeaderBlock* trailers) {
	SpdyFramer framer(SpdyFramer::ENABLE_COMPRESSION);
	if (!framer.ParseHeaderBlockInBuffer(data, data_len, trailers) \|\|
	trailers->empty()) {
	QUIC_DVLOG(1) << "Request Trailers are invalid.";
	return false; // Trailers were invalid.
	}

	// Pull out the final offset pseudo header which indicates the number of
	// response body bytes expected.
	auto it = trailers->find(kFinalOffsetHeaderKey);
	if (it == trailers->end() \|\|
	!QuicTextUtils::StringToSizeT(it->second, final_byte_offset)) {
	QUIC_DVLOG(1) << "Required key '" << kFinalOffsetHeaderKey
	<< "' not present";
	return false;
	}
	// The final offset header is no longer needed.
	trailers->erase(it->first);

	// Trailers must not have empty keys, and must not contain pseudo headers.
	for (const auto& trailer : *trailers) {
	StringPiece key = trailer.first;
	StringPiece value = trailer.second;
	if (QuicTextUtils::StartsWith(key, ":")) {
	QUIC_DVLOG(1) << "Trailers must not contain pseudo-header: '" << key
	<< "','" << value << "'.";
	return false;
	}

	// TODO(rjshade): Check for other forbidden keys, following the HTTP/2 spec.
	}

	QUIC_DVLOG(1) << "Successfully parsed Trailers: " << trailers->DebugString();
	return true;
	}

	bool SpdyUtils::CopyAndValidateHeaders(const QuicHeaderList& header_list,
	int64_t* content_length,
	SpdyHeaderBlock* headers) {
	for (const auto& p : header_list) {
	const string& name = p.first;
	if (name.empty()) {
	QUIC_DVLOG(1) << "Header name must not be empty.";
	return false;
	}

	if (QuicTextUtils::ContainsUpperCase(name)) {
	QUIC_DLOG(ERROR) << "Malformed header: Header name " << name
	<< " contains upper-case characters.";
	return false;
	}

	headers->AppendValueOrAddHeader(name, p.second);
	}

	if (QuicContainsKey(*headers, "content-length") &&
	!ExtractContentLengthFromHeaders(content_length, headers)) {
	return false;
	}

	QUIC_DVLOG(1) << "Successfully parsed headers: " << headers->DebugString();
	return true;
	}

	bool SpdyUtils::CopyAndValidateTrailers(const QuicHeaderList& header_list,
	size_t* final_byte_offset,
	SpdyHeaderBlock* trailers) {
	bool found_final_byte_offset = false;
	for (const auto& p : header_list) {
	const string& name = p.first;

	// Pull out the final offset pseudo header which indicates the number of
	// response body bytes expected.
	if (!found_final_byte_offset && name == kFinalOffsetHeaderKey &&
	QuicTextUtils::StringToSizeT(p.second, final_byte_offset)) {
	found_final_byte_offset = true;
	continue;
	}

	if (name.empty() \|\| name[0] == ':') {
	QUIC_DVLOG(1)
	<< "Trailers must not be empty, and must not contain pseudo-"
	<< "headers. Found: '" << name << "'";
	return false;
	}

	if (QuicTextUtils::ContainsUpperCase(name)) {
	QUIC_DLOG(INFO) << "Malformed header: Header name " << name
	<< " contains upper-case characters.";
	return false;
	}

	if (trailers->find(name) != trailers->end()) {
	QUIC_DLOG(INFO) << "Duplicate header '" << name << "' found in trailers.";
	return false;
	}

	(*trailers)[name] = p.second;
	}

	if (!found_final_byte_offset) {
	QUIC_DVLOG(1) << "Required key '" << kFinalOffsetHeaderKey
	<< "' not present";
	return false;
	}

	// TODO(rjshade): Check for other forbidden keys, following the HTTP/2 spec.

	QUIC_DVLOG(1) << "Successfully parsed Trailers: " << trailers->DebugString();
	return true;
	}

	// static
	string SpdyUtils::GetUrlFromHeaderBlock(const SpdyHeaderBlock& headers) {
	SpdyHeaderBlock::const_iterator it = headers.find(":scheme");
	if (it == headers.end()) {
	return "";
	}
	std::string url = it->second.as_string();

	url.append("://");

	it = headers.find(":authority");
	if (it == headers.end()) {
	return "";
	}
	url.append(it->second.as_string());

	it = headers.find(":path");
	if (it == headers.end()) {
	return "";
	}
	url.append(it->second.as_string());
	return url;
	}

	// static
	string SpdyUtils::GetHostNameFromHeaderBlock(const SpdyHeaderBlock& headers) {
	// TODO(fayang): Consider just checking out the value of the ":authority" key
	// in headers.
	return QuicUrlUtils::HostName(GetUrlFromHeaderBlock(headers));
	}

	// static
	bool SpdyUtils::UrlIsValid(const SpdyHeaderBlock& headers) {
	string url(GetUrlFromHeaderBlock(headers));
	return url != "" && QuicUrlUtils::IsValidUrl(url);
	}

	// static
	bool SpdyUtils::PopulateHeaderBlockFromUrl(const string url,
	SpdyHeaderBlock* headers) {
	(*headers)[":method"] = "GET";
	size_t pos = url.find("://");
	if (pos == string::npos) {
	return false;
	}
	(*headers)[":scheme"] = url.substr(0, pos);
	size_t start = pos + 3;
	pos = url.find("/", start);
	if (pos == string::npos) {
	(*headers)[":authority"] = url.substr(start);
	(*headers)[":path"] = "/";
	return true;
	}
	(*headers)[":authority"] = url.substr(start, pos - start);
	(*headers)[":path"] = url.substr(pos);
	return true;
	}

	} // namespace net