chrome/browser/chromeos/extensions/file_manager/file_browser_handler_api.h

   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 // File contains the fileBrowserHandlerInternal.selectFile extension function.
   6 // The function prompts user to select a file path to be used by the caller. It
   7 // will fail if it isn't invoked by a user gesture (e.g. a mouse click or a
   8 // keyboard key press).
   9 // Note that the target file is never actually created by this function, even
  10 // if the selected path doesn't exist.
  11
  12 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_BROWSER_HANDLER_API_H_
  13 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_BROWSER_HANDLER_API_H_
  14
  15 #include <string>
  16 #include <vector>
  17
  18 #include "base/files/file_path.h"
  19 #include "chrome/browser/extensions/chrome_extension_function.h"
  20
  21 class Browser;
  22 class FileBrowserHandlerInternalSelectFileFunction;
  23
  24 namespace file_manager {
  25
  26 namespace util {
  27 struct EntryDefinition;
  28 struct FileDefinition;
  29 }
  30
  31 // Interface that is used by FileBrowserHandlerInternalSelectFileFunction to
  32 // select the file path that should be reported back to the extension function
  33 // caller.  Nobody will take the ownership of the interface implementation, so
  34 // it should delete itself once it's done.
  35 class FileSelector {
  36  public:
  37   virtual ~FileSelector() {}
  38
  39   // Starts the file selection. It should prompt user to select a file path.
  40   // Once the selection is made it should asynchronously call
  41   // |function_->OnFilePathSelected| with the selection information.
  42   // User should be initially suggested to select file named |suggested_name|.
  43   // |allowed_extensions| specifies the file extensions allowed to be shown,
  44   // and selected. Extensions should not include '.'. This spec comes from
  45   // ui::SelectFileDialog() which takes extensions without '.'.
  46   //
  47   // Selection UI should be displayed using |browser|. |browser| should outlive
  48   // the interface implementation.
  49   // |function| if the extension function that called the method and needs to
  50   // be notified of user action. The interface implementation should keep a
  51   // reference to the function until it is notified (extension function
  52   // implementations are ref counted).
  53   // |SelectFile| will be called at most once by a single extension function.
  54   // The interface implementation should delete itself after the extension
  55   // function is notified of file selection result.
  56   virtual void SelectFile(
  57       const base::FilePath& suggested_name,
  58       const std::vector<std::string>& allowed_extensions,
  59       Browser* browser,
  60       FileBrowserHandlerInternalSelectFileFunction* function) = 0;
  61 };
  62
  63 // Interface that is used by FileBrowserHandlerInternalSelectFileFunction to
  64 // create a FileSelector it can use to select a file path.
  65 class FileSelectorFactory {
  66  public:
  67   virtual ~FileSelectorFactory() {}
  68
  69   // Creates a FileSelector instance for the
  70   // FileBrowserHandlerInternalSelectFileFunction.
  71   virtual FileSelector* CreateFileSelector() const = 0;
  72 };
  73
  74 }  // namespace file_manager
  75
  76
  77 // Note that this class is not in 'file_manager' class to be consistent with
  78 // all other extension functions registered in
  79 // chrome/common/extensions/api/generated_api.cc being in the global namespace.
  80 //
  81 // The fileBrowserHandlerInternal.selectFile extension function implementation.
  82 // See the file description for more info.
  83 class FileBrowserHandlerInternalSelectFileFunction
  84     : public ChromeAsyncExtensionFunction {
  85  public:
  86   // Default constructor used in production code.
  87   // It will create its own FileSelectorFactory implementation, and set the
  88   // value of |user_gesture_check_enabled| to true.
  89   FileBrowserHandlerInternalSelectFileFunction();
  90
  91   // This constructor should be used only in tests to inject test file selector
  92   // factory and to allow extension function to run even if it hasn't been
  93   // invoked by user gesture.
  94   // Created object will take the ownership of the |file_selector_factory|.
  95   FileBrowserHandlerInternalSelectFileFunction(
  96       file_manager::FileSelectorFactory* file_selector_factory,
  97       bool enable_user_gesture_check);
  98
  99   // Called by FileSelector implementation when the user selects the file's
 100   // file path. File access permissions for the selected file are granted and
 101   // caller is notified of the selection result after this method is called.
 102   // |success| Whether the path was selected.
 103   // |full_path| The selected file path if one was selected. It is ignored if
 104   // the selection did not succeed.
 105   void OnFilePathSelected(bool success, const base::FilePath& full_path);
 106
 107  protected:
 108   // The class is ref counted, so destructor should not be public.
 109   ~FileBrowserHandlerInternalSelectFileFunction() override;
 110
 111   // AsyncExtensionFunction implementation.
 112   // Runs the extension function implementation.
 113   bool RunAsync() override;
 114
 115  private:
 116   // Respond to the API with selected entry definition.
 117   void RespondEntryDefinition(
 118       const file_manager::util::EntryDefinition& entry_definition);
 119
 120   // Creates dictionary value that will be used to as the extension function's
 121   // callback argument and ends extension function execution by calling
 122   // |SendResponse(true)|.
 123   // The |results_| value will be set to dictionary containing two properties:
 124   // * boolean 'success', which will be equal to |success|.
 125   // * object 'entry', which will be set only when |success| is true, and the
 126   //   conversion to |entry_definition| was successful. In such case, it will
 127   //   contain information needed to create a FileEntry object for the selected
 128   //   file.
 129   void Respond(const file_manager::util::EntryDefinition& entry_definition,
 130                bool success);
 131
 132   // Factory used to create FileSelector to be used for prompting user to select
 133   // file.
 134   scoped_ptr<file_manager::FileSelectorFactory> file_selector_factory_;
 135   // Whether user gesture check is disabled. This should be true only in tests.
 136   bool user_gesture_check_enabled_;
 137
 138   // List of permissions and paths that have to be granted for the selected
 139   // files.
 140   std::vector<std::pair<base::FilePath, int> > permissions_to_grant_;
 141
 142   DECLARE_EXTENSION_FUNCTION("fileBrowserHandlerInternal.selectFile",
 143                              FILEBROWSERHANDLERINTERNAL_SELECTFILE)
 144 };
 145
 146 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_BROWSER_HANDLER_API_H_