Prompt user for file access permission before download starts

content/browser/android/download_controller_android_impl.h

 // Copyright (c) 2012 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.
 
 // This class pairs with DownloadController on Java side to forward requests
 // for GET downloads to the current DownloadListener. POST downloads are
 // handled on the native side.
 //
 // Both classes are Singleton classes. C++ object owns Java object.
 //
@@ skipping 36 matching lines @@
   static DownloadControllerAndroidImpl* GetInstance();
 
   static bool RegisterDownloadController(JNIEnv* env);
 
   // Called when DownloadController Java object is instantiated.
   void Init(JNIEnv* env, jobject obj);
 
   // Removes a deferred download from |deferred_downloads_|.
   void CancelDeferredDownload(DeferredDownloadObserver* observer);
 
+  // DownloadControllerAndroid implementation.
+  void AcquireFileAccessPermission(
+      WebContents* web_contents,
+      const AcquireFileAccessPermissionCallback& callback) override;
+
  private:
   // Used to store all the information about an Android download.
   struct DownloadInfoAndroid {
     explicit DownloadInfoAndroid(net::URLRequest* request);
     ~DownloadInfoAndroid();
 
     // The URL from which we are downloading. This is the final URL after any
     // redirection by the server for |original_url_|.
     GURL url;
     // The original URL before any redirection by the server for this URL.
     GURL original_url;
     int64 total_bytes;
     std::string content_disposition;
     std::string original_mime_type;
     std::string user_agent;
     std::string cookie;
     std::string referer;
     bool has_user_gesture;
 
     WebContents* web_contents;
     // Default copy constructor is used for passing this struct by value.
   };
   struct JavaObject;
   friend struct DefaultSingletonTraits<DownloadControllerAndroidImpl>;
   DownloadControllerAndroidImpl();
   ~DownloadControllerAndroidImpl() override;
 
+  // Helper method for implementing AcquireFileAccessPermission().
+  bool HasFileAccessPermission(
+      base::android::ScopedJavaLocalRef<jobject> j_content_view_core);
+  void PromptUserForPermission(
+      WebContents* web_contents,
+      const AcquireFileAccessPermissionCallback& callback);
+
   // DownloadControllerAndroid implementation.
   void CreateGETDownload(int render_process_id,
                          int render_view_id,
                          int request_id) override;
   void OnDownloadStarted(DownloadItem* download_item) override;
   void StartContextMenuDownload(const ContextMenuParams& params,
                                 WebContents* web_contents,
                                 bool is_link,
                                 const std::string& extra_headers) override;
   void DangerousDownloadValidated(WebContents* web_contents,
@@ skipping 15 matching lines @@
                      const GetDownloadInfoCB& callback,
                      const GlobalRequestID& global_id);
   void OnCookieResponse(DownloadInfoAndroid info,
                         const GetDownloadInfoCB& callback,
                         const std::string& cookie);
   void StartDownloadOnUIThread(const GetDownloadInfoCB& callback,
                                const DownloadInfoAndroid& info);
   void StartAndroidDownload(int render_process_id,
                             int render_view_id,
                             const DownloadInfoAndroid& info);
+  void StartAndroidDownloadInternal(int render_process_id,
+                                    int render_view_id,
+                                    const DownloadInfoAndroid& info,
+                                    bool allowed);
 
   // The download item contains dangerous file types.
   void OnDangerousDownload(DownloadItem *item);
 
   base::android::ScopedJavaLocalRef<jobject> GetContentViewCoreFromWebContents(
       WebContents* web_contents);
 
   WebContents* GetWebContents(int render_process_id, int render_view_id);
 
   // Creates Java object if it is not created already and returns it.
   JavaObject* GetJavaObject();
 
   JavaObject* java_object_;
 
   ScopedVector<DeferredDownloadObserver> deferred_downloads_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadControllerAndroidImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_DOWNLOAD_CONTROLLER_ANDROID_IMPL_H_