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      1 // Copyright (c) 2012 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 #ifndef CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_
      6 #define CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_
      7 
      8 #include <map>
      9 #include <set>
     10 
     11 #include "chrome/common/content_settings.h"
     12 #include "content/public/renderer/render_view_observer.h"
     13 #include "content/public/renderer/render_view_observer_tracker.h"
     14 #include "extensions/common/permissions/api_permission.h"
     15 #include "third_party/WebKit/public/web/WebPermissionClient.h"
     16 
     17 class GURL;
     18 
     19 namespace blink {
     20 class WebFrame;
     21 class WebSecurityOrigin;
     22 class WebURL;
     23 }
     24 
     25 namespace extensions {
     26 class Dispatcher;
     27 class Extension;
     28 }
     29 
     30 // Handles blocking content per content settings for each RenderView.
     31 class ContentSettingsObserver
     32     : public content::RenderViewObserver,
     33       public content::RenderViewObserverTracker<ContentSettingsObserver>,
     34       public blink::WebPermissionClient {
     35  public:
     36   ContentSettingsObserver(content::RenderView* render_view,
     37                           extensions::Dispatcher* extension_dispatcher);
     38   virtual ~ContentSettingsObserver();
     39 
     40   // Sets the content setting rules which back |AllowImage()|, |AllowScript()|,
     41   // and |AllowScriptFromSource()|. |content_setting_rules| must outlive this
     42   // |ContentSettingsObserver|.
     43   void SetContentSettingRules(
     44       const RendererContentSettingRules* content_setting_rules);
     45 
     46   bool IsPluginTemporarilyAllowed(const std::string& identifier);
     47 
     48   // Sends an IPC notification that the specified content type was blocked.
     49   void DidBlockContentType(ContentSettingsType settings_type);
     50 
     51   // blink::WebPermissionClient implementation.
     52   virtual bool allowDatabase(blink::WebFrame* frame,
     53                              const blink::WebString& name,
     54                              const blink::WebString& display_name,
     55                              unsigned long estimated_size);
     56   virtual bool allowFileSystem(blink::WebFrame* frame);
     57   virtual bool allowImage(blink::WebFrame* frame,
     58                           bool enabled_per_settings,
     59                           const blink::WebURL& image_url);
     60   virtual bool allowIndexedDB(blink::WebFrame* frame,
     61                               const blink::WebString& name,
     62                               const blink::WebSecurityOrigin& origin);
     63   virtual bool allowPlugins(blink::WebFrame* frame,
     64                             bool enabled_per_settings);
     65   virtual bool allowScript(blink::WebFrame* frame,
     66                            bool enabled_per_settings);
     67   virtual bool allowScriptFromSource(blink::WebFrame* frame,
     68                                      bool enabled_per_settings,
     69                                      const blink::WebURL& script_url);
     70   virtual bool allowStorage(blink::WebFrame* frame, bool local);
     71   virtual bool allowReadFromClipboard(blink::WebFrame* frame,
     72                                       bool default_value);
     73   virtual bool allowWriteToClipboard(blink::WebFrame* frame,
     74                                      bool default_value);
     75   virtual bool allowWebComponents(blink::WebFrame* frame, bool);
     76   virtual bool allowMutationEvents(blink::WebFrame* frame,
     77                                    bool default_value);
     78   virtual bool allowPushState(blink::WebFrame* frame);
     79   virtual bool allowWebGLDebugRendererInfo(blink::WebFrame* frame);
     80   virtual void didNotAllowPlugins(blink::WebFrame* frame);
     81   virtual void didNotAllowScript(blink::WebFrame* frame);
     82   virtual bool allowDisplayingInsecureContent(
     83       blink::WebFrame* frame,
     84       bool allowed_per_settings,
     85       const blink::WebSecurityOrigin& context,
     86       const blink::WebURL& url);
     87   virtual bool allowRunningInsecureContent(
     88       blink::WebFrame* frame,
     89       bool allowed_per_settings,
     90       const blink::WebSecurityOrigin& context,
     91       const blink::WebURL& url);
     92 
     93   // This is used for cases when the NPAPI plugins malfunction if used.
     94   bool AreNPAPIPluginsBlocked() const;
     95 
     96  private:
     97   FRIEND_TEST_ALL_PREFIXES(ContentSettingsObserverTest, WhitelistedSchemes);
     98   FRIEND_TEST_ALL_PREFIXES(ChromeRenderViewTest,
     99                            ContentSettingsInterstitialPages);
    100 
    101   // RenderViewObserver implementation.
    102   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
    103   virtual void DidCommitProvisionalLoad(blink::WebFrame* frame,
    104                                         bool is_new_navigation) OVERRIDE;
    105 
    106   // Message handlers.
    107   void OnLoadBlockedPlugins(const std::string& identifier);
    108   void OnSetAsInterstitial();
    109   void OnNPAPINotSupported();
    110   void OnSetAllowDisplayingInsecureContent(bool allow);
    111   void OnSetAllowRunningInsecureContent(bool allow);
    112 
    113   // Resets the |content_blocked_| array.
    114   void ClearBlockedContentSettings();
    115 
    116   // If |origin| corresponds to an installed extension, returns that extension.
    117   // Otherwise returns NULL.
    118   const extensions::Extension* GetExtension(
    119       const blink::WebSecurityOrigin& origin) const;
    120 
    121   // Helpers.
    122   // True if |frame| contains content that is white-listed for content settings.
    123   static bool IsWhitelistedForContentSettings(blink::WebFrame* frame);
    124   static bool IsWhitelistedForContentSettings(
    125       const blink::WebSecurityOrigin& origin,
    126       const GURL& document_url);
    127 
    128   // Owned by ChromeContentRendererClient and outlive us.
    129   extensions::Dispatcher* extension_dispatcher_;
    130 
    131   // Insecure content may be permitted for the duration of this render view.
    132   bool allow_displaying_insecure_content_;
    133   bool allow_running_insecure_content_;
    134 
    135   // A pointer to content setting rules stored by the renderer. Normally, the
    136   // |RendererContentSettingRules| object is owned by
    137   // |ChromeRenderProcessObserver|. In the tests it is owned by the caller of
    138   // |SetContentSettingRules|.
    139   const RendererContentSettingRules* content_setting_rules_;
    140 
    141   // Stores if images, scripts, and plugins have actually been blocked.
    142   bool content_blocked_[CONTENT_SETTINGS_NUM_TYPES];
    143 
    144   // Caches the result of AllowStorage.
    145   typedef std::pair<GURL, bool> StoragePermissionsKey;
    146   std::map<StoragePermissionsKey, bool> cached_storage_permissions_;
    147 
    148   // Caches the result of |AllowScript|.
    149   std::map<blink::WebFrame*, bool> cached_script_permissions_;
    150 
    151   std::set<std::string> temporarily_allowed_plugins_;
    152   bool is_interstitial_page_;
    153   bool npapi_plugins_blocked_;
    154 
    155   DISALLOW_COPY_AND_ASSIGN(ContentSettingsObserver);
    156 };
    157 
    158 #endif  // CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_
    159