// 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 "content/browser/storage_partition_impl_map.h"

#include "base/bind.h"
#include "base/callback.h"
#include "base/file_path.h"
#include "base/stl_util.h"
#include "base/string_util.h"
#include "content/browser/appcache/chrome_appcache_service.h"
#include "content/browser/fileapi/browser_file_system_helper.h"
#include "content/browser/fileapi/chrome_blob_storage_context.h"
#include "content/browser/histogram_internals_request_job.h"
#include "content/browser/net/view_blob_internals_job_factory.h"
#include "content/browser/net/view_http_cache_job_factory.h"
#include "content/browser/renderer_host/resource_request_info_impl.h"
#include "content/browser/resource_context_impl.h"
#include "content/browser/storage_partition_impl.h"
#include "content/browser/tcmalloc_internals_request_job.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/storage_partition.h"
#include "content/public/common/content_constants.h"
#include "content/public/common/url_constants.h"
#include "net/url_request/url_request_context_getter.h"
#include "net/url_request/url_request_context.h"
#include "webkit/appcache/view_appcache_internals_job.h"
#include "webkit/blob/blob_data.h"
#include "webkit/blob/blob_url_request_job_factory.h"
#include "webkit/fileapi/file_system_url_request_job_factory.h"

using appcache::AppCacheService;
using content::BrowserThread;
using fileapi::FileSystemContext;
using webkit_blob::BlobStorageController;

namespace content {

namespace {

class BlobProtocolHandler : public webkit_blob::BlobProtocolHandler {
 public:
  BlobProtocolHandler(
      webkit_blob::BlobStorageController* blob_storage_controller,
      base::MessageLoopProxy* loop_proxy)
      : webkit_blob::BlobProtocolHandler(blob_storage_controller,
                                         loop_proxy) {}

  virtual ~BlobProtocolHandler() {}

 private:
  virtual scoped_refptr<webkit_blob::BlobData>
      LookupBlobData(net::URLRequest* request) const {
    const ResourceRequestInfoImpl* info =
        ResourceRequestInfoImpl::ForRequest(request);
    if (!info)
      return NULL;
    return info->requested_blob_data();
  }

  DISALLOW_COPY_AND_ASSIGN(BlobProtocolHandler);
};

// Adds a bunch of debugging urls. We use an interceptor instead of a protocol
// handler because we want to reuse the chrome://scheme (everyone is familiar
// with it, and no need to expose the content/chrome separation through our UI).
class DeveloperProtocolHandler
    : public net::URLRequestJobFactory::Interceptor {
 public:
  DeveloperProtocolHandler(
      AppCacheService* appcache_service,
      BlobStorageController* blob_storage_controller)
      : appcache_service_(appcache_service),
        blob_storage_controller_(blob_storage_controller) {}
  virtual ~DeveloperProtocolHandler() {}

  virtual net::URLRequestJob* MaybeIntercept(
      net::URLRequest* request,
      net::NetworkDelegate* network_delegate) const OVERRIDE {
    // Check for chrome://view-http-cache/*, which uses its own job type.
    if (ViewHttpCacheJobFactory::IsSupportedURL(request->url()))
      return ViewHttpCacheJobFactory::CreateJobForRequest(request,
                                                          network_delegate);

    // Next check for chrome://appcache-internals/, which uses its own job type.
    if (request->url().SchemeIs(chrome::kChromeUIScheme) &&
        request->url().host() == chrome::kChromeUIAppCacheInternalsHost) {
      return appcache::ViewAppCacheInternalsJobFactory::CreateJobForRequest(
          request, network_delegate, appcache_service_);
    }

    // Next check for chrome://blob-internals/, which uses its own job type.
    if (ViewBlobInternalsJobFactory::IsSupportedURL(request->url())) {
      return ViewBlobInternalsJobFactory::CreateJobForRequest(
          request, network_delegate, blob_storage_controller_);
    }

#if defined(USE_TCMALLOC)
    // Next check for chrome://tcmalloc/, which uses its own job type.
    if (request->url().SchemeIs(chrome::kChromeUIScheme) &&
        request->url().host() == chrome::kChromeUITcmallocHost) {
      return new TcmallocInternalsRequestJob(request, network_delegate);
    }
#endif

    // Next check for chrome://histograms/, which uses its own job type.
    if (request->url().SchemeIs(chrome::kChromeUIScheme) &&
        request->url().host() == chrome::kChromeUIHistogramHost) {
      return new HistogramInternalsRequestJob(request, network_delegate);
    }

    return NULL;
  }

  virtual net::URLRequestJob* MaybeInterceptRedirect(
        const GURL& location,
        net::URLRequest* request,
        net::NetworkDelegate* network_delegate) const OVERRIDE {
    return NULL;
  }

  virtual net::URLRequestJob* MaybeInterceptResponse(
      net::URLRequest* request,
      net::NetworkDelegate* network_delegate) const OVERRIDE {
    return NULL;
  }

  virtual bool WillHandleProtocol(const std::string& protocol) const {
    return protocol == chrome::kChromeUIScheme;
  }

 private:
  AppCacheService* appcache_service_;
  BlobStorageController* blob_storage_controller_;
};

void InitializeURLRequestContext(
    net::URLRequestContextGetter* context_getter,
    AppCacheService* appcache_service,
    FileSystemContext* file_system_context,
    ChromeBlobStorageContext* blob_storage_context) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  if (!context_getter)
    return;  // tests.

  // This code only modifies the URLRequestJobFactory on the context
  // to handle blob: URLs, filesystem: URLs, and to let AppCache intercept
  // the appropriate requests.  This is in addition to the slew of other
  // initializtion that is done in during creation of the URLRequestContext.
  // We cannot yet centralize this code because URLRequestContext needs
  // to be created before the StoragePartition context.
  //
  // TODO(ajwong): Fix the ordering so all the initialization is in one spot.
  net::URLRequestContext* context = context_getter->GetURLRequestContext();
  net::URLRequestJobFactory* job_factory =
      const_cast<net::URLRequestJobFactory*>(context->job_factory());

  // Note: if this is called twice with 2 request contexts that share one job
  // factory (as is the case with a media request context and its related
  // normal request context) then this will early exit.
  if (job_factory->IsHandledProtocol(chrome::kBlobScheme))
    return;  // Already initialized this JobFactory.

  bool set_protocol = job_factory->SetProtocolHandler(
      chrome::kBlobScheme,
      new BlobProtocolHandler(
          blob_storage_context->controller(),
          BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE)));
  DCHECK(set_protocol);
  set_protocol = job_factory->SetProtocolHandler(
      chrome::kFileSystemScheme,
      CreateFileSystemProtocolHandler(file_system_context));
  DCHECK(set_protocol);

  job_factory->AddInterceptor(
      new DeveloperProtocolHandler(appcache_service,
                                   blob_storage_context->controller()));

  // TODO(jam): Add the ProtocolHandlerRegistryIntercepter here!
}

}  // namespace

StoragePartitionImplMap::StoragePartitionImplMap(
    BrowserContext* browser_context)
    : browser_context_(browser_context) {
}

StoragePartitionImplMap::~StoragePartitionImplMap() {
  STLDeleteContainerPairSecondPointers(partitions_.begin(),
                                       partitions_.end());
}

StoragePartitionImpl* StoragePartitionImplMap::Get(
    const std::string& partition_id) {
  // Find the previously created partition if it's available.
  std::map<std::string, StoragePartitionImpl*>::const_iterator it =
      partitions_.find(partition_id);
  if (it != partitions_.end())
    return it->second;

  // There was no previous partition, so let's make a new one.
  StoragePartitionImpl* partition =
      StoragePartitionImpl::Create(browser_context_, partition_id,
                                   browser_context_->GetPath());
  partitions_[partition_id] = partition;

  // These calls must happen after StoragePartitionImpl::Create().
  partition->SetURLRequestContext(
      partition_id.empty() ?
      browser_context_->GetRequestContext() :
      browser_context_->GetRequestContextForStoragePartition(partition_id));
  partition->SetMediaURLRequestContext(
      partition_id.empty() ?
      browser_context_->GetMediaRequestContext() :
      browser_context_->GetMediaRequestContextForStoragePartition(
          partition_id));

  PostCreateInitialization(partition);

  // TODO(ajwong): ResourceContexts no longer have any storage related state.
  // We should move this into a place where it is called once per
  // BrowserContext creation rather than piggybacking off the default context
  // creation.
  if (partition_id.empty()) {
    InitializeResourceContext(browser_context_);
  }

  return partition;
}

void StoragePartitionImplMap::ForEach(
    const BrowserContext::StoragePartitionCallback& callback) {
  for (std::map<std::string, StoragePartitionImpl*>::const_iterator it =
           partitions_.begin();
       it != partitions_.end();
       ++it) {
    callback.Run(it->first, it->second);
  }
}

void StoragePartitionImplMap::PostCreateInitialization(
    StoragePartitionImpl* partition) {
  // Check first to avoid memory leak in unittests.
  if (BrowserThread::IsMessageLoopValid(BrowserThread::IO)) {
    BrowserThread::PostTask(
        BrowserThread::IO, FROM_HERE,
        base::Bind(&ChromeAppCacheService::InitializeOnIOThread,
                   partition->GetAppCacheService(),
                   browser_context_->IsOffTheRecord() ? FilePath() :
                       partition->GetPath().Append(kAppCacheDirname),
                   browser_context_->GetResourceContext(),
                   make_scoped_refptr(partition->GetURLRequestContext()),
                   make_scoped_refptr(
                       browser_context_->GetSpecialStoragePolicy())));

    // Add content's URLRequestContext's hooks.
    BrowserThread::PostTask(
        BrowserThread::IO, FROM_HERE,
        base::Bind(
            &InitializeURLRequestContext,
            make_scoped_refptr(partition->GetURLRequestContext()),
            make_scoped_refptr(partition->GetAppCacheService()),
            make_scoped_refptr(partition->GetFileSystemContext()),
            make_scoped_refptr(
                ChromeBlobStorageContext::GetFor(browser_context_))));

    // We do not call InitializeURLRequestContext() for media contexts because,
    // other than the HTTP cache, the media contexts share the same backing
    // objects as their associated "normal" request context.  Thus, the previous
    // call serves to initialize the media request context for this storage
    // partition as well.
  }
}

}  // namespace content