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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_EXTENSIONS_CLIENT_H_
      6 #define EXTENSIONS_COMMON_EXTENSIONS_CLIENT_H_
      7 
      8 #include <set>
      9 #include <string>
     10 #include <vector>
     11 
     12 #include "base/memory/scoped_ptr.h"
     13 #include "base/strings/string_piece.h"
     14 
     15 class GURL;
     16 
     17 namespace extensions {
     18 
     19 class APIPermissionSet;
     20 class Extension;
     21 class ExtensionAPI;
     22 class FeatureProvider;
     23 class JSONFeatureProviderSource;
     24 class ManifestPermissionSet;
     25 class PermissionMessage;
     26 class PermissionMessageProvider;
     27 class SimpleFeature;
     28 class URLPatternSet;
     29 
     30 // Sets up global state for the extensions system. Should be Set() once in each
     31 // process. This should be implemented by the client of the extensions system.
     32 class ExtensionsClient {
     33  public:
     34   typedef std::vector<std::string> ScriptingWhitelist;
     35 
     36   virtual ~ExtensionsClient() {}
     37 
     38   // Initializes global state. Not done in the constructor because unit tests
     39   // can create additional ExtensionsClients because the utility thread runs
     40   // in-process.
     41   virtual void Initialize() = 0;
     42 
     43   // Returns the global PermissionMessageProvider to use to provide permission
     44   // warning strings.
     45   virtual const PermissionMessageProvider& GetPermissionMessageProvider()
     46       const = 0;
     47 
     48   // Create a FeatureProvider for a specific feature type, e.g. "permission".
     49   virtual scoped_ptr<FeatureProvider> CreateFeatureProvider(
     50       const std::string& name) const = 0;
     51 
     52   // Create a JSONFeatureProviderSource for a specific feature type,
     53   // e.g. "permission". Currently, all features are loaded from
     54   // JSONFeatureProviderSources.
     55   // This is used primarily in CreateFeatureProvider, above.
     56   virtual scoped_ptr<JSONFeatureProviderSource> CreateFeatureProviderSource(
     57       const std::string& name) const = 0;
     58 
     59   // Takes the list of all hosts and filters out those with special
     60   // permission strings. Adds the regular hosts to |new_hosts|,
     61   // and adds the special permission messages to |messages|.
     62   virtual void FilterHostPermissions(
     63       const URLPatternSet& hosts,
     64       URLPatternSet* new_hosts,
     65       std::set<PermissionMessage>* messages) const = 0;
     66 
     67   // Replaces the scripting whitelist with |whitelist|. Used in the renderer;
     68   // only used for testing in the browser process.
     69   virtual void SetScriptingWhitelist(const ScriptingWhitelist& whitelist) = 0;
     70 
     71   // Return the whitelist of extensions that can run content scripts on
     72   // any origin.
     73   virtual const ScriptingWhitelist& GetScriptingWhitelist() const = 0;
     74 
     75   // Get the set of chrome:// hosts that |extension| can run content scripts on.
     76   virtual URLPatternSet GetPermittedChromeSchemeHosts(
     77       const Extension* extension,
     78       const APIPermissionSet& api_permissions) const = 0;
     79 
     80   // Returns false if content scripts are forbidden from running on |url|.
     81   virtual bool IsScriptableURL(const GURL& url, std::string* error) const = 0;
     82 
     83   // Returns true iff a schema named |name| is generated.
     84   virtual bool IsAPISchemaGenerated(const std::string& name) const = 0;
     85 
     86   // Gets the generated API schema named |name|.
     87   virtual base::StringPiece GetAPISchema(const std::string& name) const = 0;
     88 
     89   // Register non-generated API schema resources with the global ExtensionAPI.
     90   // Called when the ExtensionAPI is lazily initialized.
     91   virtual void RegisterAPISchemaResources(ExtensionAPI* api) const = 0;
     92 
     93   // Determines if certain fatal extensions errors should be surpressed
     94   // (i.e., only logged) or allowed (i.e., logged before crashing).
     95   virtual bool ShouldSuppressFatalErrors() const = 0;
     96 
     97   // Return the extensions client.
     98   static ExtensionsClient* Get();
     99 
    100   // Initialize the extensions system with this extensions client.
    101   static void Set(ExtensionsClient* client);
    102 };
    103 
    104 }  // namespace extensions
    105 
    106 #endif  // EXTENSIONS_COMMON_EXTENSIONS_CLIENT_H_
    107