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// Copyright (c) 2012 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/spdy/spdy_http_utils.h"
#include <string>
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/time/time.h"
#include "net/base/escape.h"
#include "net/base/load_flags.h"
#include "net/base/net_util.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_request_info.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_response_info.h"
#include "net/http/http_util.h"
namespace net {
bool SpdyHeadersToHttpResponse(const SpdyHeaderBlock& headers,
int protocol_version,
HttpResponseInfo* response) {
std::string status_key = (protocol_version >= 3) ? ":status" : "status";
std::string version_key = (protocol_version >= 3) ? ":version" : "version";
std::string version;
std::string status;
// The "status" and "version" headers are required.
SpdyHeaderBlock::const_iterator it;
it = headers.find(status_key);
if (it == headers.end())
return false;
status = it->second;
it = headers.find(version_key);
if (it == headers.end())
return false;
version = it->second;
std::string raw_headers(version);
raw_headers.push_back(' ');
raw_headers.append(status);
raw_headers.push_back('\0');
for (it = headers.begin(); it != headers.end(); ++it) {
// For each value, if the server sends a NUL-separated
// list of values, we separate that back out into
// individual headers for each value in the list.
// e.g.
// Set-Cookie "foo\0bar"
// becomes
// Set-Cookie: foo\0
// Set-Cookie: bar\0
std::string value = it->second;
size_t start = 0;
size_t end = 0;
do {
end = value.find('\0', start);
std::string tval;
if (end != value.npos)
tval = value.substr(start, (end - start));
else
tval = value.substr(start);
if (protocol_version >= 3 && it->first[0] == ':')
raw_headers.append(it->first.substr(1));
else
raw_headers.append(it->first);
raw_headers.push_back(':');
raw_headers.append(tval);
raw_headers.push_back('\0');
start = end + 1;
} while (end != value.npos);
}
response->headers = new HttpResponseHeaders(raw_headers);
response->was_fetched_via_spdy = true;
return true;
}
void CreateSpdyHeadersFromHttpRequest(const HttpRequestInfo& info,
const HttpRequestHeaders& request_headers,
SpdyHeaderBlock* headers,
int protocol_version,
bool direct) {
HttpRequestHeaders::Iterator it(request_headers);
while (it.GetNext()) {
std::string name = StringToLowerASCII(it.name());
if (name == "connection" || name == "proxy-connection" ||
name == "transfer-encoding") {
continue;
}
if (headers->find(name) == headers->end()) {
(*headers)[name] = it.value();
} else {
std::string new_value = (*headers)[name];
new_value.append(1, '\0'); // +=() doesn't append 0's
new_value += it.value();
(*headers)[name] = new_value;
}
}
static const char kHttpProtocolVersion[] = "HTTP/1.1";
if (protocol_version < 3) {
(*headers)["version"] = kHttpProtocolVersion;
(*headers)["method"] = info.method;
(*headers)["host"] = GetHostAndOptionalPort(info.url);
(*headers)["scheme"] = info.url.scheme();
if (direct)
(*headers)["url"] = HttpUtil::PathForRequest(info.url);
else
(*headers)["url"] = HttpUtil::SpecForRequest(info.url);
} else {
(*headers)[":version"] = kHttpProtocolVersion;
(*headers)[":method"] = info.method;
(*headers)[":host"] = GetHostAndOptionalPort(info.url);
(*headers)[":scheme"] = info.url.scheme();
(*headers)[":path"] = HttpUtil::PathForRequest(info.url);
headers->erase("host"); // this is kinda insane, spdy 3 spec.
}
}
COMPILE_ASSERT(HIGHEST - LOWEST < 4 &&
HIGHEST - MINIMUM_PRIORITY < 5,
request_priority_incompatible_with_spdy);
SpdyPriority ConvertRequestPriorityToSpdyPriority(
const RequestPriority priority,
int protocol_version) {
DCHECK_GE(priority, MINIMUM_PRIORITY);
DCHECK_LT(priority, NUM_PRIORITIES);
if (protocol_version == 2) {
// SPDY 2 only has 2 bits of priority, but we have 5 RequestPriorities.
// Map IDLE => 3, LOWEST => 2, LOW => 2, MEDIUM => 1, HIGHEST => 0.
if (priority > LOWEST) {
return static_cast<SpdyPriority>(HIGHEST - priority);
} else {
return static_cast<SpdyPriority>(HIGHEST - priority - 1);
}
} else {
return static_cast<SpdyPriority>(HIGHEST - priority);
}
}
NET_EXPORT_PRIVATE RequestPriority ConvertSpdyPriorityToRequestPriority(
SpdyPriority priority,
int protocol_version) {
// Handle invalid values gracefully, and pick LOW to map 2 back
// to for SPDY/2.
SpdyPriority idle_cutoff = (protocol_version == 2) ? 3 : 5;
return (priority >= idle_cutoff) ?
IDLE : static_cast<RequestPriority>(HIGHEST - priority);
}
GURL GetUrlFromHeaderBlock(const SpdyHeaderBlock& headers,
int protocol_version,
bool pushed) {
// SPDY 2 server push urls are specified in a single "url" header.
if (pushed && protocol_version == 2) {
std::string url;
SpdyHeaderBlock::const_iterator it;
it = headers.find("url");
if (it != headers.end())
url = it->second;
return GURL(url);
}
const char* scheme_header = protocol_version >= 3 ? ":scheme" : "scheme";
const char* host_header = protocol_version >= 3 ? ":host" : "host";
const char* path_header = protocol_version >= 3 ? ":path" : "url";
std::string scheme;
std::string host_port;
std::string path;
SpdyHeaderBlock::const_iterator it;
it = headers.find(scheme_header);
if (it != headers.end())
scheme = it->second;
it = headers.find(host_header);
if (it != headers.end())
host_port = it->second;
it = headers.find(path_header);
if (it != headers.end())
path = it->second;
std::string url = (scheme.empty() || host_port.empty() || path.empty())
? std::string()
: scheme + "://" + host_port + path;
return GURL(url);
}
bool ShouldShowHttpHeaderValue(const std::string& header_name) {
#if defined(SPDY_PROXY_AUTH_ORIGIN)
if (header_name == "proxy-authorization")
return false;
#endif
return true;
}
} // namespace net
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