Move web store data fetching and parsing out of WebstoreStandaloneInstaller.

chrome/browser/extensions/webstore_data_fetcher.h

+// Copyright 2013 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_WEBSTORE_DATA_FETCHER_H_
+#define CHROME_BROWSER_EXTENSIONS_WEBSTORE_DATA_FETCHER_H_
+
+#include <string>
+
+#include "base/memory/weak_ptr.h"
+#include "googleurl/src/gurl.h"
+#include "net/url_request/url_fetcher_delegate.h"
+
+namespace base {
+class DictionaryValue;
+}
+
+namespace net {
+class URLFetcher;
+class URLRequestContextGetter;
+}
+
+namespace extensions {
+
+class WebstoreDataFetcherDelegate;
+
+// WebstoreDataFetcher fetches web store data and parses it into a
+// DictionaryValue.
+class WebstoreDataFetcher : public base::SupportsWeakPtr<WebstoreDataFetcher>,
+                            public net::URLFetcherDelegate {
+ public:
+  WebstoreDataFetcher(WebstoreDataFetcherDelegate* delegate,
+                      net::URLRequestContextGetter* request_context,
+                      const GURL& referrer_url,
+                      const std::string webstore_item_id);
+  virtual ~WebstoreDataFetcher();
+
+  void Start();
+
+ private:
+  class SafeWebstoreResponseParser;
+
+  // Client callbacks for SafeWebstoreResponseParser when parsing is complete.
+  void OnWebstoreResponseParseSuccess(base::DictionaryValue* webstore_data);
+  void OnWebstoreResponseParseFailure(const std::string& error);
+
+  // net::URLFetcherDelegate overrides:
+  virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
+
+  WebstoreDataFetcherDelegate* delegate_;
+  net::URLRequestContextGetter* request_context_;
+  GURL referrer_url_;
+  std::string id_;
+
+  // For fetching webstore JSON data.
+  scoped_ptr<net::URLFetcher> webstore_data_url_fetcher_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebstoreDataFetcher);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_WEBSTORE_DATA_FETCHER_H_