ios/chrome/browser/web_resource/ios_web_resource_service.cc

   1 // Copyright 2015 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 "ios/chrome/browser/web_resource/ios_web_resource_service.h"
   6
   7 #include "base/bind.h"
   8 #include "base/json/json_reader.h"
   9 #include "base/values.h"
  10 #include "ios/chrome/browser/application_context.h"
  11 #include "ios/web/public/web_thread.h"
  12
  13 namespace {
  14
  15 const char kInvalidDataTypeError[] =
  16     "Data from web resource server is missing or not valid JSON.";
  17
  18 const char kUnexpectedJSONFormatError[] =
  19     "Data from web resource server does not have expected format.";
  20
  21 // Helper method to run a closure.
  22 void RunClosure(const base::Closure& closure) {
  23   closure.Run();
  24 }
  25
  26 }  // namespace
  27
  28 IOSWebResourceService::IOSWebResourceService(
  29     PrefService* prefs,
  30     const GURL& web_resource_server,
  31     bool apply_locale_to_url,
  32     const char* last_update_time_pref_name,
  33     int start_fetch_delay_ms,
  34     int cache_update_delay_ms)
  35     : web_resource::WebResourceService(
  36           prefs,
  37           web_resource_server,
  38           apply_locale_to_url ? GetApplicationContext()->GetApplicationLocale()
  39                               : std::string(),
  40           last_update_time_pref_name,
  41           start_fetch_delay_ms,
  42           cache_update_delay_ms,
  43           GetApplicationContext()->GetSystemURLRequestContext(),
  44           nullptr) {
  45 }
  46
  47 IOSWebResourceService::~IOSWebResourceService() {
  48 }
  49
  50 // static
  51 base::Closure IOSWebResourceService::ParseJSONOnBackgroundThread(
  52     const std::string& data,
  53     const SuccessCallback& success_callback,
  54     const ErrorCallback& error_callback) {
  55   if (data.empty())
  56     return base::Bind(error_callback, std::string(kInvalidDataTypeError));
  57
  58   scoped_ptr<base::Value> value(base::JSONReader::Read(data));
  59   if (!value.get()) {
  60     // Page information not properly read, or corrupted.
  61     return base::Bind(error_callback, std::string(kInvalidDataTypeError));
  62   }
  63
  64   if (!value->IsType(base::Value::TYPE_DICTIONARY))
  65     return base::Bind(error_callback, std::string(kUnexpectedJSONFormatError));
  66
  67   return base::Bind(success_callback, base::Passed(&value));
  68 }
  69
  70 void IOSWebResourceService::ParseJSON(const std::string& data,
  71                                       const SuccessCallback& success_callback,
  72                                       const ErrorCallback& error_callback) {
  73   base::PostTaskAndReplyWithResult(
  74       web::WebThread::GetBlockingPool(), FROM_HERE,
  75       base::Bind(&IOSWebResourceService::ParseJSONOnBackgroundThread, data,
  76                  success_callback, error_callback),
  77       base::Bind(&RunClosure));
  78 }