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// 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/spdy_utils.h"
#include <vector>
#include "base/memory/scoped_ptr.h"
#include "base/stl_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "net/spdy/spdy_frame_builder.h"
#include "net/spdy/spdy_framer.h"
#include "net/spdy/spdy_protocol.h"
#include "url/gurl.h"
using std::string;
using std::vector;
namespace net {
// static
string SpdyUtils::SerializeUncompressedHeaders(const SpdyHeaderBlock& headers) {
SpdyMajorVersion spdy_version = HTTP2;
size_t length = SpdyFramer::GetSerializedLength(spdy_version, &headers);
SpdyFrameBuilder builder(length, spdy_version);
SpdyFramer framer(spdy_version);
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(HTTP2);
if (!framer.ParseHeaderBlockInBuffer(data, data_len, headers) ||
headers->empty()) {
return false; // Headers were invalid.
}
if (ContainsKey(*headers, "content-length")) {
// Check whether multiple values are consistent.
base::StringPiece content_length_header = (*headers)["content-length"];
vector<string> values =
base::SplitString(content_length_header, base::StringPiece("\0", 1),
base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
for (const string& value : values) {
int new_value;
if (!base::StringToInt(value, &new_value) || new_value < 0) {
return false;
}
if (*content_length < 0) {
*content_length = new_value;
continue;
}
if (new_value != *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(HTTP2);
if (!framer.ParseHeaderBlockInBuffer(data, data_len, trailers) ||
trailers->empty()) {
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() ||
!base::StringToSizeT(it->second, final_byte_offset)) {
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) {
base::StringPiece key = trailer.first;
base::StringPiece value = trailer.second;
if (key.starts_with(":")) {
DVLOG(1) << "Trailers must not contain pseudo-header: '" << key << "','"
<< value << "'.";
return false;
}
// TODO(rjshade): Check for other forbidden keys, following the HTTP/2 spec.
}
DVLOG(1) << "Successfully parsed Trailers.";
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) {
return GURL(GetUrlFromHeaderBlock(headers)).host();
}
// static
bool SpdyUtils::UrlIsValid(const SpdyHeaderBlock& headers) {
string url(GetUrlFromHeaderBlock(headers));
return url != "" && GURL(url).is_valid();
}
} // namespace net
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