content/browser/service_worker/service_worker_context_request_handler.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/service_worker/service_worker_context_request_handler.h"
   6
   7 #include "base/time/time.h"
   8 #include "content/browser/service_worker/service_worker_context_core.h"
   9 #include "content/browser/service_worker/service_worker_provider_host.h"
  10 #include "content/browser/service_worker/service_worker_read_from_cache_job.h"
  11 #include "content/browser/service_worker/service_worker_storage.h"
  12 #include "content/browser/service_worker/service_worker_version.h"
  13 #include "content/browser/service_worker/service_worker_write_to_cache_job.h"
  14 #include "content/public/browser/resource_context.h"
  15 #include "content/public/common/resource_response_info.h"
  16 #include "net/base/load_flags.h"
  17 #include "net/url_request/url_request.h"
  18
  19 namespace content {
  20
  21 ServiceWorkerContextRequestHandler::ServiceWorkerContextRequestHandler(
  22     base::WeakPtr<ServiceWorkerContextCore> context,
  23     base::WeakPtr<ServiceWorkerProviderHost> provider_host,
  24     base::WeakPtr<storage::BlobStorageContext> blob_storage_context,
  25     ResourceType resource_type)
  26     : ServiceWorkerRequestHandler(context,
  27                                   provider_host,
  28                                   blob_storage_context,
  29                                   resource_type),
  30       version_(provider_host_->running_hosted_version()) {
  31   DCHECK(provider_host_->IsHostToRunningServiceWorker());
  32 }
  33
  34 ServiceWorkerContextRequestHandler::~ServiceWorkerContextRequestHandler() {
  35 }
  36
  37 net::URLRequestJob* ServiceWorkerContextRequestHandler::MaybeCreateJob(
  38     net::URLRequest* request,
  39     net::NetworkDelegate* network_delegate,
  40     ResourceContext* resource_context) {
  41   if (!provider_host_ || !version_.get() || !context_)
  42     return NULL;
  43
  44   // We currently have no use case for hijacking a redirected request.
  45   if (request->url_chain().size() > 1)
  46     return NULL;
  47
  48   // We only use the script cache for main script loading and
  49   // importScripts(), even if a cached script is xhr'd, we don't
  50   // retrieve it from the script cache.
  51   // TODO(michaeln): Get the desired behavior clarified in the spec,
  52   // and make tweak the behavior here to match.
  53   if (resource_type_ != RESOURCE_TYPE_SERVICE_WORKER &&
  54       resource_type_ != RESOURCE_TYPE_SCRIPT) {
  55     return NULL;
  56   }
  57
  58   if (ShouldAddToScriptCache(request->url())) {
  59     ServiceWorkerRegistration* registration =
  60         context_->GetLiveRegistration(version_->registration_id());
  61     DCHECK(registration);  // We're registering or updating so must be there.
  62
  63     int64 response_id = context_->storage()->NewResourceId();
  64     if (response_id == kInvalidServiceWorkerResponseId)
  65       return NULL;
  66
  67     // Bypass the browser cache for initial installs and update
  68     // checks after 24 hours have passed.
  69     int extra_load_flags = 0;
  70     base::TimeDelta time_since_last_check =
  71         base::Time::Now() - registration->last_update_check();
  72     if (time_since_last_check > base::TimeDelta::FromHours(
  73                                     kServiceWorkerScriptMaxCacheAgeInHours) ||
  74         version_->force_bypass_cache_for_scripts()) {
  75       extra_load_flags = net::LOAD_BYPASS_CACHE;
  76     }
  77
  78     ServiceWorkerVersion* stored_version = registration->waiting_version()
  79                                                ? registration->waiting_version()
  80                                                : registration->active_version();
  81     int64 incumbent_response_id = kInvalidServiceWorkerResourceId;
  82     if (stored_version && stored_version->script_url() == request->url()) {
  83       incumbent_response_id =
  84           stored_version->script_cache_map()->LookupResourceId(request->url());
  85     }
  86     return new ServiceWorkerWriteToCacheJob(
  87         request, network_delegate, resource_type_, context_, version_.get(),
  88         extra_load_flags, response_id, incumbent_response_id);
  89   }
  90
  91   int64 response_id = kInvalidServiceWorkerResponseId;
  92   if (ShouldReadFromScriptCache(request->url(), &response_id)) {
  93     return new ServiceWorkerReadFromCacheJob(
  94         request, network_delegate, context_, version_, response_id);
  95   }
  96
  97   // NULL means use the network.
  98   return NULL;
  99 }
 100
 101 void ServiceWorkerContextRequestHandler::GetExtraResponseInfo(
 102     ResourceResponseInfo* response_info) const {
 103   response_info->was_fetched_via_service_worker = false;
 104   response_info->was_fallback_required_by_service_worker = false;
 105   response_info->original_url_via_service_worker = GURL();
 106   response_info->response_type_via_service_worker =
 107       blink::WebServiceWorkerResponseTypeDefault;
 108 }
 109
 110 bool ServiceWorkerContextRequestHandler::ShouldAddToScriptCache(
 111     const GURL& url) {
 112   // We only write imports that occur during the initial eval.
 113   if (version_->status() != ServiceWorkerVersion::NEW &&
 114       version_->status() != ServiceWorkerVersion::INSTALLING) {
 115     return false;
 116   }
 117   return version_->script_cache_map()->LookupResourceId(url) ==
 118          kInvalidServiceWorkerResponseId;
 119 }
 120
 121 bool ServiceWorkerContextRequestHandler::ShouldReadFromScriptCache(
 122     const GURL& url, int64* response_id_out) {
 123   // We don't read from the script cache until the version is INSTALLED.
 124   if (version_->status() == ServiceWorkerVersion::NEW ||
 125       version_->status() == ServiceWorkerVersion::INSTALLING)
 126     return false;
 127   *response_id_out = version_->script_cache_map()->LookupResourceId(url);
 128   return *response_id_out != kInvalidServiceWorkerResponseId;
 129 }
 130
 131 }  // namespace content