chrome/browser/extensions/webstore_data_fetcher.cc

   1 // Copyright 2013 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 "chrome/browser/extensions/webstore_data_fetcher.h"
   6
   7 #include "base/bind.h"
   8 #include "base/values.h"
   9 #include "chrome/browser/extensions/webstore_data_fetcher_delegate.h"
  10 #include "components/safe_json_parser/safe_json_parser.h"
  11 #include "extensions/common/extension_urls.h"
  12 #include "net/base/load_flags.h"
  13 #include "net/url_request/url_fetcher.h"
  14 #include "net/url_request/url_request_status.h"
  15
  16 namespace {
  17
  18 const char kInvalidWebstoreResponseError[] = "Invalid Chrome Web Store reponse";
  19
  20 }  // namespace
  21
  22 namespace extensions {
  23
  24 WebstoreDataFetcher::WebstoreDataFetcher(
  25     WebstoreDataFetcherDelegate* delegate,
  26     net::URLRequestContextGetter* request_context,
  27     const GURL& referrer_url,
  28     const std::string webstore_item_id)
  29     : delegate_(delegate),
  30       request_context_(request_context),
  31       referrer_url_(referrer_url),
  32       id_(webstore_item_id),
  33       max_auto_retries_(0) {
  34 }
  35
  36 WebstoreDataFetcher::~WebstoreDataFetcher() {}
  37
  38 void WebstoreDataFetcher::Start() {
  39   GURL webstore_data_url(extension_urls::GetWebstoreItemJsonDataURL(id_));
  40
  41   webstore_data_url_fetcher_ =
  42       net::URLFetcher::Create(webstore_data_url, net::URLFetcher::GET, this);
  43   webstore_data_url_fetcher_->SetRequestContext(request_context_);
  44   webstore_data_url_fetcher_->SetReferrer(referrer_url_.spec());
  45   webstore_data_url_fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SAVE_COOKIES |
  46                                            net::LOAD_DISABLE_CACHE);
  47   if (max_auto_retries_ > 0) {
  48     webstore_data_url_fetcher_->SetMaxRetriesOn5xx(max_auto_retries_);
  49     webstore_data_url_fetcher_->SetAutomaticallyRetryOnNetworkChanges(
  50         max_auto_retries_);
  51   }
  52   webstore_data_url_fetcher_->Start();
  53 }
  54
  55 void WebstoreDataFetcher::OnJsonParseSuccess(
  56     scoped_ptr<base::Value> parsed_json) {
  57   if (!parsed_json->IsType(base::Value::TYPE_DICTIONARY)) {
  58     OnJsonParseFailure(kInvalidWebstoreResponseError);
  59     return;
  60   }
  61
  62   delegate_->OnWebstoreResponseParseSuccess(scoped_ptr<base::DictionaryValue>(
  63       static_cast<base::DictionaryValue*>(parsed_json.release())));
  64 }
  65
  66 void WebstoreDataFetcher::OnJsonParseFailure(
  67     const std::string& error) {
  68   delegate_->OnWebstoreResponseParseFailure(error);
  69 }
  70
  71 void WebstoreDataFetcher::OnURLFetchComplete(const net::URLFetcher* source) {
  72   CHECK_EQ(webstore_data_url_fetcher_.get(), source);
  73
  74   scoped_ptr<net::URLFetcher> fetcher(webstore_data_url_fetcher_.Pass());
  75
  76   if (!fetcher->GetStatus().is_success() ||
  77       fetcher->GetResponseCode() != 200) {
  78     delegate_->OnWebstoreRequestFailure();
  79     return;
  80   }
  81
  82   std::string webstore_json_data;
  83   fetcher->GetResponseAsString(&webstore_json_data);
  84
  85   scoped_refptr<safe_json_parser::SafeJsonParser> parser =
  86       new safe_json_parser::SafeJsonParser(
  87           webstore_json_data,
  88           base::Bind(&WebstoreDataFetcher::OnJsonParseSuccess, AsWeakPtr()),
  89           base::Bind(&WebstoreDataFetcher::OnJsonParseFailure, AsWeakPtr()));
  90   // The parser will call us back via one of the callbacks.
  91   parser->Start();
  92 }
  93
  94 }  // namespace extensions