blob: 47a80608ef3c754fe6ab53e8fa3d1cc73989949a [file] [log] [blame]
// 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/http/http_vary_data.h"
#include <stdlib.h>
#include "base/pickle.h"
#include "base/strings/string_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_util.h"
#include "starboard/memory.h"
#include "starboard/types.h"
namespace net {
HttpVaryData::HttpVaryData() : is_valid_(false) {
bool HttpVaryData::Init(const HttpRequestInfo& request_info,
const HttpResponseHeaders& response_headers) {
base::MD5Context ctx;
is_valid_ = false;
bool processed_header = false;
// Feed the MD5 context in the order of the Vary header enumeration. If the
// Vary header repeats a header name, then that's OK.
// If the Vary header contains '*' then we can just notice it based on
// |cached_response_headers| in MatchesRequest(), and don't have to worry
// about the specific headers. We still want an HttpVaryData around, to let
// us handle this case. See section 4.1 of RFC 7234.
size_t iter = 0;
std::string name = "vary", request_header;
while (response_headers.EnumerateHeader(&iter, name, &request_header)) {
if (request_header == "*") {
// What's in request_digest_ will never be looked at, but make it
// deterministic so we don't serialize out uninitialized memory content.
memset(&request_digest_, 0, sizeof(request_digest_));
return is_valid_ = true;
AddField(request_info, request_header, &ctx);
processed_header = true;
if (!processed_header)
return false;
base::MD5Final(&request_digest_, &ctx);
return is_valid_ = true;
bool HttpVaryData::InitFromPickle(base::PickleIterator* iter) {
is_valid_ = false;
const char* data;
if (iter->ReadBytes(&data, sizeof(request_digest_))) {
memcpy(&request_digest_, data, sizeof(request_digest_));
return is_valid_ = true;
return false;
void HttpVaryData::Persist(base::Pickle* pickle) const {
pickle->WriteBytes(&request_digest_, sizeof(request_digest_));
bool HttpVaryData::MatchesRequest(
const HttpRequestInfo& request_info,
const HttpResponseHeaders& cached_response_headers) const {
// Vary: * never matches.
if (cached_response_headers.HasHeaderValue("vary", "*"))
return false;
HttpVaryData new_vary_data;
if (!new_vary_data.Init(request_info, cached_response_headers)) {
// This case can happen if |this| was loaded from a cache that was populated
// by a build before was fixed.
return false;
return memcmp(&new_vary_data.request_digest_, &request_digest_,
sizeof(request_digest_)) == 0;
// static
std::string HttpVaryData::GetRequestValue(
const HttpRequestInfo& request_info,
const std::string& request_header) {
// Unfortunately, we do not have access to all of the request headers at this
// point. Most notably, we do not have access to an Authorization header if
// one will be added to the request.
std::string result;
if (request_info.extra_headers.GetHeader(request_header, &result))
return result;
return std::string();
// static
void HttpVaryData::AddField(const HttpRequestInfo& request_info,
const std::string& request_header,
base::MD5Context* ctx) {
std::string request_value = GetRequestValue(request_info, request_header);
// Append a character that cannot appear in the request header line so that we
// protect against case where the concatenation of two request headers could
// look the same for a variety of values for the individual request headers.
// For example, "foo: 12\nbar: 3" looks like "foo: 1\nbar: 23" otherwise.
request_value.append(1, '\n');
base::MD5Update(ctx, request_value);
} // namespace net