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 "net/base/load_flags.h"
  16 #include "net/url_request/url_request.h"
  17
  18 namespace content {
  19
  20 ServiceWorkerContextRequestHandler::ServiceWorkerContextRequestHandler(
  21     base::WeakPtr<ServiceWorkerContextCore> context,
  22     base::WeakPtr<ServiceWorkerProviderHost> provider_host,
  23     base::WeakPtr<storage::BlobStorageContext> blob_storage_context,
  24     ResourceType resource_type)
  25     : ServiceWorkerRequestHandler(context,
  26                                   provider_host,
  27                                   blob_storage_context,
  28                                   resource_type),
  29       version_(provider_host_->running_hosted_version()) {
  30   DCHECK(provider_host_->IsHostToRunningServiceWorker());
  31 }
  32
  33 ServiceWorkerContextRequestHandler::~ServiceWorkerContextRequestHandler() {
  34 }
  35
  36 net::URLRequestJob* ServiceWorkerContextRequestHandler::MaybeCreateJob(
  37     net::URLRequest* request,
  38     net::NetworkDelegate* network_delegate,
  39     ResourceContext* resource_context) {
  40   if (!provider_host_ || !version_.get() || !context_)
  41     return NULL;
  42
  43   // We currently have no use case for hijacking a redirected request.
  44   if (request->url_chain().size() > 1)
  45     return NULL;
  46
  47   // We only use the script cache for main script loading and
  48   // importScripts(), even if a cached script is xhr'd, we don't
  49   // retrieve it from the script cache.
  50   // TODO(michaeln): Get the desired behavior clarified in the spec,
  51   // and make tweak the behavior here to match.
  52   if (resource_type_ != RESOURCE_TYPE_SERVICE_WORKER &&
  53       resource_type_ != RESOURCE_TYPE_SCRIPT) {
  54     return NULL;
  55   }
  56
  57   if (ShouldAddToScriptCache(request->url())) {
  58     ServiceWorkerRegistration* registration =
  59         context_->GetLiveRegistration(version_->registration_id());
  60     DCHECK(registration);  // We're registering or updating so must be there.
  61
  62     int64 response_id = context_->storage()->NewResourceId();
  63     if (response_id == kInvalidServiceWorkerResponseId)
  64       return NULL;
  65
  66     // Bypass the browser cache for initial installs and update
  67     // checks after 24 hours have passed.
  68     int extra_load_flags = 0;
  69     base::TimeDelta time_since_last_check =
  70         base::Time::Now() - registration->last_update_check();
  71     if (time_since_last_check > base::TimeDelta::FromHours(24) ||
  72         version_->force_bypass_cache_for_scripts()) {
  73       extra_load_flags = net::LOAD_BYPASS_CACHE;
  74     }
  75
  76     return new ServiceWorkerWriteToCacheJob(request,
  77                                             network_delegate,
  78                                             resource_type_,
  79                                             context_,
  80                                             version_.get(),
  81                                             extra_load_flags,
  82                                             response_id);
  83   }
  84
  85   int64 response_id = kInvalidServiceWorkerResponseId;
  86   if (ShouldReadFromScriptCache(request->url(), &response_id)) {
  87     return new ServiceWorkerReadFromCacheJob(
  88         request, network_delegate, context_, version_, response_id);
  89   }
  90
  91   // NULL means use the network.
  92   return NULL;
  93 }
  94
  95 void ServiceWorkerContextRequestHandler::GetExtraResponseInfo(
  96     bool* was_fetched_via_service_worker,
  97     bool* was_fallback_required_by_service_worker,
  98     GURL* original_url_via_service_worker,
  99     blink::WebServiceWorkerResponseType* response_type_via_service_worker,
 100     base::TimeTicks* fetch_start_time,
 101     base::TimeTicks* fetch_ready_time,
 102     base::TimeTicks* fetch_end_time) const {
 103   *was_fetched_via_service_worker = false;
 104   *was_fallback_required_by_service_worker = false;
 105   *original_url_via_service_worker = GURL();
 106   *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