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// Copyright 2015 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/foreign_fetch_request_handler.h"
#include <string>
#include "base/macros.h"
#include "content/browser/service_worker/service_worker_context_wrapper.h"
#include "content/browser/service_worker/service_worker_response_info.h"
#include "content/browser/service_worker/service_worker_url_request_job.h"
#include "content/common/resource_request_body.h"
#include "content/common/service_worker/service_worker_utils.h"
#include "net/url_request/url_request.h"
#include "net/url_request/url_request_interceptor.h"
#include "storage/browser/blob/blob_storage_context.h"
namespace content {
namespace {
int kUserDataKey; // Only address is used.
class ForeignFetchRequestInterceptor : public net::URLRequestInterceptor {
public:
explicit ForeignFetchRequestInterceptor(ResourceContext* resource_context)
: resource_context_(resource_context) {}
~ForeignFetchRequestInterceptor() override {}
net::URLRequestJob* MaybeInterceptRequest(
net::URLRequest* request,
net::NetworkDelegate* network_delegate) const override {
ForeignFetchRequestHandler* handler =
ForeignFetchRequestHandler::GetHandler(request);
if (!handler)
return nullptr;
return handler->MaybeCreateJob(request, network_delegate,
resource_context_);
}
private:
ResourceContext* resource_context_;
DISALLOW_COPY_AND_ASSIGN(ForeignFetchRequestInterceptor);
};
} // namespace
void ForeignFetchRequestHandler::InitializeHandler(
net::URLRequest* request,
ServiceWorkerContextWrapper* context_wrapper,
storage::BlobStorageContext* blob_storage_context,
int process_id,
int provider_id,
bool skip_service_worker,
FetchRequestMode request_mode,
FetchCredentialsMode credentials_mode,
FetchRedirectMode redirect_mode,
ResourceType resource_type,
RequestContextType request_context_type,
RequestContextFrameType frame_type,
scoped_refptr<ResourceRequestBody> body) {
if (!context_wrapper) {
return;
}
if (!context_wrapper->OriginHasForeignFetchRegistrations(
request->url().GetOrigin())) {
return;
}
if (request->initiator().IsSameOriginWith(url::Origin(request->url())))
return;
if (ServiceWorkerUtils::IsMainResourceType(resource_type))
return;
// Any more precise checks to see if the request should be intercepted are
// asynchronous, so just create our handler in all cases.
std::unique_ptr<ForeignFetchRequestHandler> handler(
new ForeignFetchRequestHandler(
context_wrapper, blob_storage_context->AsWeakPtr(), request_mode,
credentials_mode, redirect_mode, resource_type, request_context_type,
frame_type, body));
request->SetUserData(&kUserDataKey, handler.release());
}
ForeignFetchRequestHandler* ForeignFetchRequestHandler::GetHandler(
net::URLRequest* request) {
return static_cast<ForeignFetchRequestHandler*>(
request->GetUserData(&kUserDataKey));
}
std::unique_ptr<net::URLRequestInterceptor>
ForeignFetchRequestHandler::CreateInterceptor(
ResourceContext* resource_context) {
return std::unique_ptr<net::URLRequestInterceptor>(
new ForeignFetchRequestInterceptor(resource_context));
}
ForeignFetchRequestHandler::~ForeignFetchRequestHandler() {}
net::URLRequestJob* ForeignFetchRequestHandler::MaybeCreateJob(
net::URLRequest* request,
net::NetworkDelegate* network_delegate,
ResourceContext* resource_context) {
ClearJob();
ServiceWorkerResponseInfo::ResetDataForRequest(request);
if (!context_) {
// We can't do anything other than to fall back to network.
job_.reset();
return nullptr;
}
// This may get called multiple times for original and redirect requests:
// A. original request case: use_network_ is false, no previous location info.
// B. redirect or restarted request case:
// a) use_network_ is false if the previous location was forwarded to SW.
// b) use_network_ is false if the previous location was fallback.
// c) use_network_ is true if additional restart was required to fall back.
// Fall back to network. (Case B-c)
if (use_network_) {
// TODO(mek): Determine if redirects should be able to be intercepted by
// other foreign fetch service workers.
return nullptr;
}
// It's for original request (A) or redirect case (B-a or B-b).
DCHECK(!job_.get() || job_->ShouldForwardToServiceWorker());
ServiceWorkerURLRequestJob* job = new ServiceWorkerURLRequestJob(
request, network_delegate, std::string(), blob_storage_context_,
resource_context, request_mode_, credentials_mode_, redirect_mode_,
resource_type_, request_context_type_, frame_type_, body_,
ServiceWorkerFetchType::FOREIGN_FETCH, this);
job_ = job->GetWeakPtr();
context_->FindReadyRegistrationForDocument(
request->url(),
base::Bind(&ForeignFetchRequestHandler::DidFindRegistration,
weak_factory_.GetWeakPtr(), job_));
return job_.get();
}
ForeignFetchRequestHandler::ForeignFetchRequestHandler(
ServiceWorkerContextWrapper* context,
base::WeakPtr<storage::BlobStorageContext> blob_storage_context,
FetchRequestMode request_mode,
FetchCredentialsMode credentials_mode,
FetchRedirectMode redirect_mode,
ResourceType resource_type,
RequestContextType request_context_type,
RequestContextFrameType frame_type,
scoped_refptr<ResourceRequestBody> body)
: context_(context),
blob_storage_context_(blob_storage_context),
resource_type_(resource_type),
request_mode_(request_mode),
credentials_mode_(credentials_mode),
redirect_mode_(redirect_mode),
request_context_type_(request_context_type),
frame_type_(frame_type),
body_(body),
weak_factory_(this) {}
void ForeignFetchRequestHandler::DidFindRegistration(
const base::WeakPtr<ServiceWorkerURLRequestJob>& job,
ServiceWorkerStatusCode status,
const scoped_refptr<ServiceWorkerRegistration>& registration) {
if (!job || job.get() != job_.get()) {
// No more job to handle, or job changed somehow, so just return.
return;
}
if (status != SERVICE_WORKER_OK || !job->request()) {
job->FallbackToNetwork();
return;
}
ServiceWorkerVersion* active_version = registration->active_version();
DCHECK(active_version);
const GURL& request_url = job->request()->url();
bool scope_matches = false;
for (const GURL& scope : active_version->foreign_fetch_scopes()) {
if (ServiceWorkerUtils::ScopeMatches(scope, request_url)) {
scope_matches = true;
break;
}
}
const url::Origin& request_origin = job->request()->initiator();
bool origin_matches = active_version->foreign_fetch_origins().empty();
for (const url::Origin& origin : active_version->foreign_fetch_origins()) {
if (request_origin.IsSameOriginWith(origin))
origin_matches = true;
}
if (!scope_matches || !origin_matches) {
job->FallbackToNetwork();
return;
}
target_worker_ = active_version;
job->ForwardToServiceWorker();
}
void ForeignFetchRequestHandler::OnPrepareToRestart() {
use_network_ = true;
ClearJob();
}
ServiceWorkerVersion* ForeignFetchRequestHandler::GetServiceWorkerVersion(
ServiceWorkerMetrics::URLRequestJobResult* result) {
// TODO(mek): Figure out what should happen if the active worker changes or
// gets uninstalled before this point is reached.
if (!target_worker_) {
*result = ServiceWorkerMetrics::REQUEST_JOB_ERROR_NO_ACTIVE_VERSION;
return nullptr;
}
return target_worker_.get();
}
void ForeignFetchRequestHandler::ClearJob() {
job_.reset();
target_worker_ = nullptr;
}
} // namespace content
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