chrome/browser/extensions/chrome_requirements_checker.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 #ifndef CHROME_BROWSER_EXTENSIONS_CHROME_REQUIREMENTS_CHECKER_H_
   6 #define CHROME_BROWSER_EXTENSIONS_CHROME_REQUIREMENTS_CHECKER_H_
   7
   8 #include <vector>
   9
  10 #include "base/callback.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/memory/weak_ptr.h"
  13 #include "extensions/browser/requirements_checker.h"
  14
  15 class GPUFeatureChecker;
  16
  17 namespace extensions {
  18 class Extension;
  19
  20 // Validates the 'requirements' extension manifest field. This is an
  21 // asynchronous process that involves several threads, but the public interface
  22 // of this class (including constructor and destructor) must only be used on
  23 // the UI thread.
  24 class ChromeRequirementsChecker : public RequirementsChecker {
  25  public:
  26   ChromeRequirementsChecker();
  27   ~ChromeRequirementsChecker() override;
  28
  29  private:
  30   // RequirementsChecker:
  31   void Check(const scoped_refptr<const Extension>& extension,
  32              const RequirementsCheckedCallback& callback) override;
  33
  34   // Callbacks for the GPUFeatureChecker.
  35   void SetWebGLAvailability(bool available);
  36
  37   void MaybeRunCallback();
  38
  39   std::vector<std::string> errors_;
  40
  41   // Every requirement that needs to be resolved asynchronously will add to
  42   // this counter. When the counter is depleted, the callback will be run.
  43   int pending_requirement_checks_;
  44
  45   scoped_refptr<GPUFeatureChecker> webgl_checker_;
  46
  47   RequirementsCheckedCallback callback_;
  48
  49   base::WeakPtrFactory<ChromeRequirementsChecker> weak_ptr_factory_;
  50
  51   DISALLOW_COPY_AND_ASSIGN(ChromeRequirementsChecker);
  52 };
  53
  54 }  // namespace extensions
  55
  56 #endif  // CHROME_BROWSER_EXTENSIONS_CHROME_REQUIREMENTS_CHECKER_H_