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      1 // Copyright 2014 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_API_HID_HID_DEVICE_MANAGER_H_
      6 #define CHROME_BROWSER_EXTENSIONS_API_HID_HID_DEVICE_MANAGER_H_
      7 
      8 #include <stdint.h>
      9 
     10 #include <map>
     11 
     12 #include "base/basictypes.h"
     13 #include "base/memory/scoped_ptr.h"
     14 #include "base/threading/thread_checker.h"
     15 #include "chrome/browser/profiles/profile.h"
     16 #include "chrome/common/extensions/api/hid.h"
     17 #include "device/hid/hid_device_info.h"
     18 #include "extensions/browser/browser_context_keyed_api_factory.h"
     19 
     20 namespace extensions {
     21 
     22 class HidDeviceManager : public BrowserContextKeyedAPI {
     23  public:
     24   explicit HidDeviceManager(content::BrowserContext* context);
     25   virtual ~HidDeviceManager();
     26 
     27   // BrowserContextKeyedAPI implementation.
     28   static BrowserContextKeyedAPIFactory<HidDeviceManager>* GetFactoryInstance();
     29 
     30   // Convenience method to get the HidDeviceManager for a profile.
     31   static HidDeviceManager* Get(content::BrowserContext* context) {
     32     return BrowserContextKeyedAPIFactory<HidDeviceManager>::Get(context);
     33   }
     34 
     35   scoped_ptr<base::ListValue> GetApiDevices(uint16_t vendor_id,
     36                                             uint16_t product_id);
     37 
     38   bool GetDeviceInfo(int resource_id, device::HidDeviceInfo* device_info);
     39 
     40  private:
     41   friend class BrowserContextKeyedAPIFactory<HidDeviceManager>;
     42 
     43   static const char* service_name() { return "HidDeviceManager"; }
     44 
     45   void UpdateDevices();
     46 
     47   // Determines if a given device interface should be accessible to API
     48   // consumers. In order for a device interface to be accessible, ALL of its
     49   // specified usages must be accessible.
     50   static bool IsDeviceAccessible(const device::HidDeviceInfo& device_info);
     51 
     52   // Determines if a given usage is available to API consumers. This is used to
     53   // blacklist usages which could be security or privacy concerns.
     54   static bool IsUsageAccessible(const device::HidUsageAndPage& usage_and_page);
     55 
     56   base::ThreadChecker thread_checker_;
     57 
     58   int next_resource_id_;
     59 
     60   typedef std::map<int, device::HidDeviceId> ResourceIdToDeviceIdMap;
     61   typedef std::map<device::HidDeviceId, int> DeviceIdToResourceIdMap;
     62 
     63   ResourceIdToDeviceIdMap device_ids_;
     64   DeviceIdToResourceIdMap resource_ids_;
     65 
     66   DISALLOW_COPY_AND_ASSIGN(HidDeviceManager);
     67 };
     68 
     69 }  // namespace extensions
     70 
     71 #endif  // CHROME_BROWSER_EXTENSIONS_API_HID_HID_DEVICE_MANAGER_H_
     72