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      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 #ifndef EXTENSIONS_COMMON_MANIFEST_HANDLERS_BACKGROUND_INFO_H_
      6 #define EXTENSIONS_COMMON_MANIFEST_HANDLERS_BACKGROUND_INFO_H_
      7 
      8 #include <string>
      9 #include <vector>
     10 
     11 #include "base/values.h"
     12 #include "extensions/common/extension.h"
     13 #include "extensions/common/manifest_handler.h"
     14 #include "url/gurl.h"
     15 
     16 namespace extensions {
     17 
     18 class BackgroundInfo : public Extension::ManifestData {
     19  public:
     20   BackgroundInfo();
     21   virtual ~BackgroundInfo();
     22 
     23   static GURL GetBackgroundURL(const Extension* extension);
     24   static const std::vector<std::string>& GetBackgroundScripts(
     25       const Extension* extension);
     26   static bool HasBackgroundPage(const Extension* extension);
     27   static bool HasPersistentBackgroundPage(const Extension* extension);
     28   static bool HasLazyBackgroundPage(const Extension* extension);
     29   static bool HasGeneratedBackgroundPage(const Extension* extension);
     30   static bool AllowJSAccess(const Extension* extension);
     31 
     32   bool has_background_page() const {
     33     return background_url_.is_valid() || !background_scripts_.empty();
     34   }
     35 
     36   bool has_persistent_background_page() const {
     37     return has_background_page() && is_persistent_;
     38   }
     39 
     40   bool has_lazy_background_page() const {
     41     return has_background_page() && !is_persistent_;
     42   }
     43 
     44   bool Parse(const Extension* extension, string16* error);
     45 
     46  private:
     47   bool LoadBackgroundScripts(const Extension* extension,
     48                              const std::string& key,
     49                              string16* error);
     50   bool LoadBackgroundPage(const Extension* extension,
     51                           const std::string& key,
     52                           string16* error);
     53   bool LoadBackgroundPage(const Extension* extension, string16* error);
     54   bool LoadBackgroundPersistent(const Extension* extension, string16* error);
     55   bool LoadAllowJSAccess(const Extension* extension, string16* error);
     56 
     57   // Optional URL to a master page of which a single instance should be always
     58   // loaded in the background.
     59   GURL background_url_;
     60 
     61   // Optional list of scripts to use to generate a background page. If this is
     62   // present, background_url_ will be empty and generated by GetBackgroundURL().
     63   std::vector<std::string> background_scripts_;
     64 
     65   // True if the background page should stay loaded forever; false if it should
     66   // load on-demand (when it needs to handle an event). Defaults to true.
     67   bool is_persistent_;
     68 
     69   // True if the background page can be scripted by pages of the app or
     70   // extension, in which case all such pages must run in the same process.
     71   // False if such pages are not permitted to script the background page,
     72   // allowing them to run in different processes.
     73   // Defaults to true.
     74   bool allow_js_access_;
     75 
     76   DISALLOW_COPY_AND_ASSIGN(BackgroundInfo);
     77 };
     78 
     79 // Parses all background/event page-related keys in the manifest.
     80 class BackgroundManifestHandler : public ManifestHandler {
     81  public:
     82   BackgroundManifestHandler();
     83   virtual ~BackgroundManifestHandler();
     84 
     85   virtual bool Parse(Extension* extension, string16* error) OVERRIDE;
     86   virtual bool Validate(const Extension* extension,
     87                         std::string* error,
     88                         std::vector<InstallWarning>* warnings) const OVERRIDE;
     89   virtual bool AlwaysParseForType(Manifest::Type type) const OVERRIDE;
     90 
     91  private:
     92   virtual const std::vector<std::string> Keys() const OVERRIDE;
     93 
     94   DISALLOW_COPY_AND_ASSIGN(BackgroundManifestHandler);
     95 };
     96 
     97 }  // namespace extensions
     98 
     99 #endif  // EXTENSIONS_COMMON_MANIFEST_HANDLERS_BACKGROUND_INFO_H_
    100