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// Copyright (c) 2011 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/url_request/url_request_job_manager.h"
#include <algorithm>
#include "base/memory/singleton.h"
#include "build/build_config.h"
#include "base/string_util.h"
#include "net/base/load_flags.h"
#include "net/base/net_errors.h"
#include "net/url_request/url_request_about_job.h"
#include "net/url_request/url_request_data_job.h"
#include "net/url_request/url_request_error_job.h"
#include "net/url_request/url_request_file_job.h"
#include "net/url_request/url_request_ftp_job.h"
#include "net/url_request/url_request_http_job.h"
namespace net {
// The built-in set of protocol factories
namespace {
struct SchemeToFactory {
const char* scheme;
URLRequest::ProtocolFactory* factory;
};
} // namespace
static const SchemeToFactory kBuiltinFactories[] = {
{ "http", URLRequestHttpJob::Factory },
{ "https", URLRequestHttpJob::Factory },
{ "file", URLRequestFileJob::Factory },
#ifndef ANDROID
{ "ftp", URLRequestFtpJob::Factory },
{ "about", URLRequestAboutJob::Factory },
{ "data", URLRequestDataJob::Factory },
#endif
};
// static
URLRequestJobManager* URLRequestJobManager::GetInstance() {
return Singleton<URLRequestJobManager>::get();
}
URLRequestJob* URLRequestJobManager::CreateJob(
URLRequest* request) const {
#ifndef NDEBUG
DCHECK(IsAllowedThread());
#endif
// If we are given an invalid URL, then don't even try to inspect the scheme.
if (!request->url().is_valid())
return new URLRequestErrorJob(request, ERR_INVALID_URL);
// We do this here to avoid asking interceptors about unsupported schemes.
const std::string& scheme = request->url().scheme(); // already lowercase
if (!SupportsScheme(scheme))
return new URLRequestErrorJob(request, ERR_UNKNOWN_URL_SCHEME);
// THREAD-SAFETY NOTICE:
// We do not need to acquire the lock here since we are only reading our
// data structures. They should only be modified on the current thread.
// See if the request should be intercepted.
if (!(request->load_flags() & LOAD_DISABLE_INTERCEPT)) {
InterceptorList::const_iterator i;
for (i = interceptors_.begin(); i != interceptors_.end(); ++i) {
URLRequestJob* job = (*i)->MaybeIntercept(request);
if (job)
return job;
}
}
// See if the request should be handled by a registered protocol factory.
// If the registered factory returns null, then we want to fall-back to the
// built-in protocol factory.
FactoryMap::const_iterator i = factories_.find(scheme);
if (i != factories_.end()) {
URLRequestJob* job = i->second(request, scheme);
if (job)
return job;
}
// See if the request should be handled by a built-in protocol factory.
for (size_t i = 0; i < arraysize(kBuiltinFactories); ++i) {
if (scheme == kBuiltinFactories[i].scheme) {
URLRequestJob* job = (kBuiltinFactories[i].factory)(request, scheme);
DCHECK(job); // The built-in factories are not expected to fail!
return job;
}
}
// If we reached here, then it means that a registered protocol factory
// wasn't interested in handling the URL. That is fairly unexpected, and we
// don't know have a specific error to report here :-(
LOG(WARNING) << "Failed to map: " << request->url().spec();
return new URLRequestErrorJob(request, ERR_FAILED);
}
URLRequestJob* URLRequestJobManager::MaybeInterceptRedirect(
URLRequest* request,
const GURL& location) const {
#ifndef NDEBUG
DCHECK(IsAllowedThread());
#endif
if ((request->load_flags() & LOAD_DISABLE_INTERCEPT) ||
(request->status().status() == URLRequestStatus::CANCELED) ||
!request->url().is_valid() ||
!SupportsScheme(request->url().scheme()))
return NULL;
InterceptorList::const_iterator i;
for (i = interceptors_.begin(); i != interceptors_.end(); ++i) {
URLRequestJob* job = (*i)->MaybeInterceptRedirect(request, location);
if (job)
return job;
}
return NULL;
}
URLRequestJob* URLRequestJobManager::MaybeInterceptResponse(
URLRequest* request) const {
#ifndef NDEBUG
DCHECK(IsAllowedThread());
#endif
if ((request->load_flags() & LOAD_DISABLE_INTERCEPT) ||
(request->status().status() == URLRequestStatus::CANCELED) ||
!request->url().is_valid() ||
!SupportsScheme(request->url().scheme()))
return NULL;
InterceptorList::const_iterator i;
for (i = interceptors_.begin(); i != interceptors_.end(); ++i) {
URLRequestJob* job = (*i)->MaybeInterceptResponse(request);
if (job)
return job;
}
return NULL;
}
bool URLRequestJobManager::SupportsScheme(const std::string& scheme) const {
// The set of registered factories may change on another thread.
{
base::AutoLock locked(lock_);
if (factories_.find(scheme) != factories_.end())
return true;
}
for (size_t i = 0; i < arraysize(kBuiltinFactories); ++i)
if (LowerCaseEqualsASCII(scheme, kBuiltinFactories[i].scheme))
return true;
return false;
}
URLRequest::ProtocolFactory* URLRequestJobManager::RegisterProtocolFactory(
const std::string& scheme,
URLRequest::ProtocolFactory* factory) {
#ifndef NDEBUG
DCHECK(IsAllowedThread());
#endif
base::AutoLock locked(lock_);
URLRequest::ProtocolFactory* old_factory;
FactoryMap::iterator i = factories_.find(scheme);
if (i != factories_.end()) {
old_factory = i->second;
} else {
old_factory = NULL;
}
if (factory) {
factories_[scheme] = factory;
} else if (i != factories_.end()) { // uninstall any old one
factories_.erase(i);
}
return old_factory;
}
void URLRequestJobManager::RegisterRequestInterceptor(
URLRequest::Interceptor* interceptor) {
#ifndef NDEBUG
DCHECK(IsAllowedThread());
#endif
base::AutoLock locked(lock_);
DCHECK(std::find(interceptors_.begin(), interceptors_.end(), interceptor) ==
interceptors_.end());
interceptors_.push_back(interceptor);
}
void URLRequestJobManager::UnregisterRequestInterceptor(
URLRequest::Interceptor* interceptor) {
#ifndef NDEBUG
DCHECK(IsAllowedThread());
#endif
base::AutoLock locked(lock_);
InterceptorList::iterator i =
std::find(interceptors_.begin(), interceptors_.end(), interceptor);
DCHECK(i != interceptors_.end());
interceptors_.erase(i);
}
URLRequestJobManager::URLRequestJobManager() : enable_file_access_(false) {
#ifndef NDEBUG
allowed_thread_ = 0;
allowed_thread_initialized_ = false;
#endif
}
URLRequestJobManager::~URLRequestJobManager() {}
} // namespace net
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