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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 {
namespace {
void AddSpdyHeader(const std::string& name,
const std::string& value,
SpdyHeaderBlock* headers) {
if (headers->find(name) == headers->end()) {
(*headers)[name] = value;
} else {
(*headers)[name] += '\0' + value;
}
}
} // namespace
bool SpdyHeadersToHttpResponse(const SpdyHeaderBlock& headers,
SpdyMajorVersion protocol_version,
HttpResponseInfo* response) {
std::string status_key = (protocol_version >= SPDY3) ? ":status" : "status";
std::string version_key =
(protocol_version >= SPDY3) ? ":version" : "version";
std::string version;
std::string status;
// The "status" header is required. "version" is required below HTTP/2.
SpdyHeaderBlock::const_iterator it;
it = headers.find(status_key);
if (it == headers.end())
return false;
status = it->second;
if (protocol_version >= HTTP2) {
version = "HTTP/1.1";
} else {
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,
SpdyMajorVersion protocol_version,
bool direct,
SpdyHeaderBlock* headers) {
HttpRequestHeaders::Iterator it(request_headers);
while (it.GetNext()) {
std::string name = base::StringToLowerASCII(it.name());
if (name == "connection" || name == "proxy-connection" ||
name == "transfer-encoding" || name == "host") {
continue;
}
AddSpdyHeader(name, it.value(), headers);
}
static const char kHttpProtocolVersion[] = "HTTP/1.1";
switch (protocol_version) {
case SPDY2:
// TODO(bnc): Remove this code now that SPDY/2 is deprecated.
(*headers)["version"] = kHttpProtocolVersion;
(*headers)["method"] = info.method;
(*headers)["host"] = GetHostAndOptionalPort(info.url);
if (info.method == "CONNECT") {
(*headers)["url"] = GetHostAndPort(info.url);
} else {
(*headers)["scheme"] = info.url.scheme();
(*headers)["url"] = direct ? info.url.PathForRequest()
: HttpUtil::SpecForRequest(info.url);
}
break;
case SPDY3:
(*headers)[":version"] = kHttpProtocolVersion;
(*headers)[":host"] = GetHostAndOptionalPort(info.url);
(*headers)[":method"] = info.method;
if (info.method == "CONNECT") {
(*headers)[":path"] = GetHostAndPort(info.url);
} else {
(*headers)[":scheme"] = info.url.scheme();
(*headers)[":path"] = info.url.PathForRequest();
}
break;
case HTTP2:
(*headers)[":method"] = info.method;
if (info.method == "CONNECT") {
(*headers)[":authority"] = GetHostAndPort(info.url);
} else {
(*headers)[":authority"] = GetHostAndOptionalPort(info.url);
(*headers)[":scheme"] = info.url.scheme();
(*headers)[":path"] = info.url.PathForRequest();
}
break;
default:
NOTREACHED();
}
}
void CreateSpdyHeadersFromHttpResponse(
const HttpResponseHeaders& response_headers,
SpdyMajorVersion protocol_version,
SpdyHeaderBlock* headers) {
std::string status_key = (protocol_version >= SPDY3) ? ":status" : "status";
std::string version_key =
(protocol_version >= SPDY3) ? ":version" : "version";
const std::string status_line = response_headers.GetStatusLine();
std::string::const_iterator after_version =
std::find(status_line.begin(), status_line.end(), ' ');
if (protocol_version < HTTP2) {
(*headers)[version_key] = std::string(status_line.begin(), after_version);
}
(*headers)[status_key] = std::string(after_version + 1, status_line.end());
void* iter = NULL;
std::string raw_name, value;
while (response_headers.EnumerateHeaderLines(&iter, &raw_name, &value)) {
std::string name = base::StringToLowerASCII(raw_name);
AddSpdyHeader(name, value, headers);
}
}
static_assert(HIGHEST - LOWEST < 4 && HIGHEST - MINIMUM_PRIORITY < 5,
"request priority incompatible with spdy");
SpdyPriority ConvertRequestPriorityToSpdyPriority(
const RequestPriority priority,
SpdyMajorVersion protocol_version) {
DCHECK_GE(priority, MINIMUM_PRIORITY);
DCHECK_LE(priority, MAXIMUM_PRIORITY);
return static_cast<SpdyPriority>(MAXIMUM_PRIORITY - priority);
}
NET_EXPORT_PRIVATE RequestPriority ConvertSpdyPriorityToRequestPriority(
SpdyPriority priority,
SpdyMajorVersion protocol_version) {
// Handle invalid values gracefully.
// Note that SpdyPriority is not an enum, hence the magic constants.
return (priority >= 5) ?
IDLE : static_cast<RequestPriority>(4 - priority);
}
GURL GetUrlFromHeaderBlock(const SpdyHeaderBlock& headers,
SpdyMajorVersion protocol_version,
bool pushed) {
DCHECK_LE(SPDY3, protocol_version);
SpdyHeaderBlock::const_iterator it = headers.find(":scheme");
if (it == headers.end())
return GURL();
std::string url = it->second;
url.append("://");
it = headers.find(protocol_version >= HTTP2 ? ":authority" : ":host");
if (it == headers.end())
return GURL();
url.append(it->second);
it = headers.find(":path");
if (it == headers.end())
return GURL();
url.append(it->second);
return GURL(url);
}
} // namespace net
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