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// Copyright 2016 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 "content/browser/service_worker/link_header_support.h"
#include "base/command_line.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "components/link_header_util/link_header_util.h"
#include "content/browser/loader/resource_message_filter.h"
#include "content/browser/loader/resource_request_info_impl.h"
#include "content/browser/service_worker/service_worker_context_wrapper.h"
#include "content/browser/service_worker/service_worker_request_handler.h"
#include "content/common/origin_trials/trial_token_validator.h"
#include "content/common/service_worker/service_worker_utils.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/common/browser_side_navigation_policy.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/origin_util.h"
#include "net/http/http_util.h"
#include "net/url_request/url_request.h"
namespace content {
namespace {
void RegisterServiceWorkerFinished(int64_t trace_id, bool result) {
TRACE_EVENT_ASYNC_END1("ServiceWorker",
"LinkHeaderResourceThrottle::HandleServiceWorkerLink",
trace_id, "Success", result);
}
void HandleServiceWorkerLink(
net::URLRequest* request,
const std::string& url,
const std::unordered_map<std::string, base::Optional<std::string>>& params,
ServiceWorkerContextWrapper* service_worker_context_for_testing) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableExperimentalWebPlatformFeatures) &&
!TrialTokenValidator::RequestEnablesFeature(request, "ForeignFetch")) {
// TODO(mek): Log attempt to use without having correct token?
return;
}
if (ContainsKey(params, "anchor"))
return;
ResourceRequestInfoImpl* request_info =
ResourceRequestInfoImpl::ForRequest(request);
ServiceWorkerContext* service_worker_context =
service_worker_context_for_testing
? service_worker_context_for_testing
: request_info->requester_info()->service_worker_context();
if (!service_worker_context)
return;
ServiceWorkerProviderHost* provider_host =
ServiceWorkerRequestHandler::GetProviderHost(request);
// If fetched from a service worker, make sure fetching service worker is
// controlling at least one client to prevent a service worker from spawning
// new service workers in the background.
if (provider_host && provider_host->IsHostToRunningServiceWorker()) {
if (!provider_host->running_hosted_version()->HasControllee())
return;
}
if (ServiceWorkerUtils::IsMainResourceType(request_info->GetResourceType())) {
// In case of navigations, make sure the navigation will actually result in
// a secure context.
if (!provider_host || !provider_host->IsContextSecureForServiceWorker())
return;
} else {
// If this is not a navigation, make sure the request was initiated from a
// secure context.
if (!request_info->initiated_in_secure_context())
return;
}
// TODO(mek): support for a serviceworker link on a request that wouldn't ever
// be able to be intercepted by a serviceworker isn't very useful, so this
// should share logic with ServiceWorkerRequestHandler and
// ForeignFetchRequestHandler to limit the requests for which serviceworker
// links are processed.
GURL context_url = request->url();
GURL script_url = context_url.Resolve(url);
auto scope_param = params.find("scope");
GURL scope_url = scope_param == params.end()
? script_url.Resolve("./")
: context_url.Resolve(scope_param->second.value_or(""));
if (!context_url.is_valid() || !script_url.is_valid() ||
!scope_url.is_valid())
return;
if (!ServiceWorkerUtils::AllOriginsMatchAndCanAccessServiceWorkers(
{context_url, scope_url, script_url})) {
return;
}
std::string error;
if (ServiceWorkerUtils::ContainsDisallowedCharacter(scope_url, script_url,
&error))
return;
if (!GetContentClient()->browser()->AllowServiceWorker(
scope_url, request->first_party_for_cookies(),
request_info->GetContext(),
request_info->GetWebContentsGetterForRequest()))
return;
static int64_t trace_id = 0;
TRACE_EVENT_ASYNC_BEGIN2(
"ServiceWorker", "LinkHeaderResourceThrottle::HandleServiceWorkerLink",
++trace_id, "Pattern", scope_url.spec(), "Script URL", script_url.spec());
service_worker_context->RegisterServiceWorker(
scope_url, script_url,
base::Bind(&RegisterServiceWorkerFinished, trace_id));
}
void ProcessLinkHeaderValueForRequest(
net::URLRequest* request,
std::string::const_iterator value_begin,
std::string::const_iterator value_end,
ServiceWorkerContextWrapper* service_worker_context_for_testing) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
std::string url;
std::unordered_map<std::string, base::Optional<std::string>> params;
if (!link_header_util::ParseLinkHeaderValue(value_begin, value_end, &url,
¶ms))
return;
auto rel_param = params.find("rel");
if (rel_param == params.end() || !rel_param->second)
return;
for (const auto& rel : base::SplitStringPiece(rel_param->second.value(),
HTTP_LWS, base::TRIM_WHITESPACE,
base::SPLIT_WANT_NONEMPTY)) {
if (base::EqualsCaseInsensitiveASCII(rel, "serviceworker"))
HandleServiceWorkerLink(request, url, params,
service_worker_context_for_testing);
}
}
} // namespace
void ProcessRequestForLinkHeaders(net::URLRequest* request) {
std::string link_header;
request->GetResponseHeaderByName("link", &link_header);
if (link_header.empty())
return;
ProcessLinkHeaderForRequest(request, link_header);
}
void ProcessLinkHeaderForRequest(
net::URLRequest* request,
const std::string& link_header,
ServiceWorkerContextWrapper* service_worker_context_for_testing) {
for (const auto& value : link_header_util::SplitLinkHeader(link_header)) {
ProcessLinkHeaderValueForRequest(request, value.first, value.second,
service_worker_context_for_testing);
}
}
} // namespace content
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