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_BROWSER_EXTENSIONS_EXTERNAL_PREF_LOADER_H_ 6 #define CHROME_BROWSER_EXTENSIONS_EXTERNAL_PREF_LOADER_H_ 7 8 #include "chrome/browser/extensions/external_loader.h" 9 10 #include <string> 11 12 #include "base/compiler_specific.h" 13 #include "base/memory/scoped_ptr.h" 14 #include "base/values.h" 15 16 namespace extensions { 17 18 // A specialization of the ExternalLoader that uses a json file to 19 // look up which external extensions are registered. 20 // Instances of this class are expected to be created and destroyed on the UI 21 // thread and they are expecting public method calls from the UI thread. 22 class ExternalPrefLoader : public ExternalLoader { 23 public: 24 enum Options { 25 NONE = 0, 26 27 // Ensure that only root can force an external install by checking 28 // that all components of the path to external extensions files are 29 // owned by root and not writable by any non-root user. 30 ENSURE_PATH_CONTROLLED_BY_ADMIN = 1 << 0 31 }; 32 33 // |base_path_id| is the directory containing the external_extensions.json 34 // file or the standalone extension manifest files. Relative file paths to 35 // extension files are resolved relative to this path. 36 ExternalPrefLoader(int base_path_id, Options options); 37 38 virtual const base::FilePath GetBaseCrxFilePath() OVERRIDE; 39 40 protected: 41 virtual ~ExternalPrefLoader() {} 42 43 virtual void StartLoading() OVERRIDE; 44 bool IsOptionSet(Options option) { 45 return (options_ & option) != 0; 46 } 47 48 // The resource id of the base path with the information about the json 49 // file containing which extensions to load. 50 const int base_path_id_; 51 52 const Options options_; 53 54 private: 55 friend class base::RefCountedThreadSafe<ExternalLoader>; 56 57 // Actually searches for and loads candidate standalone extension preference 58 // files in the path corresponding to |base_path_id|. 59 // Must be called on the file thread. 60 void LoadOnFileThread(); 61 62 // Extracts the information contained in an external_extension.json file 63 // regarding which extensions to install. |prefs| will be modified to 64 // receive the extracted extension information. 65 // Must be called from the File thread. 66 void ReadExternalExtensionPrefFile(DictionaryValue * prefs); 67 68 // Extracts the information contained in standalone external extension 69 // json files (<extension id>.json) regarding what external extensions 70 // to install. |prefs| will be modified to receive the extracted extension 71 // information. 72 // Must be called from the File thread. 73 void ReadStandaloneExtensionPrefFiles(DictionaryValue * prefs); 74 75 // The path (coresponding to |base_path_id_| containing the json files 76 // describing which extensions to load. 77 base::FilePath base_path_; 78 79 DISALLOW_COPY_AND_ASSIGN(ExternalPrefLoader); 80 }; 81 82 // A simplified version of ExternalPrefLoader that loads the dictionary 83 // from json data specified in a string. 84 class ExternalTestingLoader : public ExternalLoader { 85 public: 86 ExternalTestingLoader(const std::string& json_data, 87 const base::FilePath& fake_base_path); 88 89 virtual const base::FilePath GetBaseCrxFilePath() OVERRIDE; 90 91 protected: 92 virtual void StartLoading() OVERRIDE; 93 94 private: 95 friend class base::RefCountedThreadSafe<ExternalLoader>; 96 97 virtual ~ExternalTestingLoader(); 98 99 base::FilePath fake_base_path_; 100 scoped_ptr<DictionaryValue> testing_prefs_; 101 102 DISALLOW_COPY_AND_ASSIGN(ExternalTestingLoader); 103 }; 104 105 } // namespace extensions 106 107 #endif // CHROME_BROWSER_EXTENSIONS_EXTERNAL_PREF_LOADER_H_ 108
