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1 // Copyright (c) 2010 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_POLICY_DEVICE_MANAGEMENT_POLICY_CACHE_H_ | |
6 #define CHROME_BROWSER_POLICY_DEVICE_MANAGEMENT_POLICY_CACHE_H_ | |
7 | |
8 #include "base/file_path.h" | |
9 #include "base/gtest_prod_util.h" | |
10 #include "base/ref_counted.h" | |
11 #include "base/scoped_ptr.h" | |
12 #include "base/synchronization/lock.h" | |
13 #include "base/time.h" | |
14 #include "chrome/browser/policy/proto/device_management_backend.pb.h" | |
15 | |
16 class DictionaryValue; | |
17 class Value; | |
18 | |
19 namespace policy { | |
20 | |
21 namespace em = enterprise_management; | |
22 | |
23 // Keeps the authoritative copy of cloud policy information as read from the | |
24 // persistence file or determined by the policy backend. The cache doesn't talk | |
25 // to the service directly, but receives updated policy information through | |
26 // SetPolicy() calls, which is then persisted and decoded into the internal | |
27 // Value representation chrome uses. | |
28 class DeviceManagementPolicyCache { | |
29 public: | |
30 explicit DeviceManagementPolicyCache(const FilePath& backing_file_path); | |
31 ~DeviceManagementPolicyCache(); | |
32 | |
33 // Loads policy information from the backing file. Non-existing or erroneous | |
34 // cache files are ignored. | |
35 void LoadPolicyFromFile(); | |
36 | |
37 // Resets the policy information. Returns true if the new policy is different | |
38 // from the previously stored policy. | |
39 bool SetPolicy(const em::DevicePolicyResponse& policy); | |
40 | |
41 // Gets the policy information. Ownership of the return value is transferred | |
42 // to the caller. | |
43 DictionaryValue* GetPolicy(); | |
44 | |
45 void SetDeviceUnmanaged(); | |
46 bool is_device_unmanaged() const { | |
47 return is_device_unmanaged_; | |
48 } | |
49 | |
50 // Returns the time as which the policy was last fetched. | |
51 base::Time last_policy_refresh_time() const { | |
52 return last_policy_refresh_time_; | |
53 } | |
54 | |
55 private: | |
56 friend class DeviceManagementPolicyCacheDecodeTest; | |
57 FRIEND_TEST_ALL_PREFIXES(DeviceManagementPolicyCacheDecodeTest, DecodePolicy); | |
58 | |
59 // Decodes an int64 value. Checks whether the passed value fits the numeric | |
60 // limits of the value representation. Returns a value (ownership is | |
61 // transferred to the caller) on success, NULL on failure. | |
62 static Value* DecodeIntegerValue(google::protobuf::int64 value); | |
63 | |
64 // Decode a GenericValue message to the Value representation used internally. | |
65 // Returns NULL if |value| is invalid (i.e. contains no actual value). | |
66 static Value* DecodeValue(const em::GenericValue& value); | |
67 | |
68 // Decodes a policy message and returns it in Value representation. Ownership | |
69 // of the returned dictionary is transferred to the caller. | |
70 static DictionaryValue* DecodePolicy( | |
71 const em::DevicePolicyResponse& response); | |
72 | |
73 // The file in which we store a cached version of the policy information. | |
74 const FilePath backing_file_path_; | |
75 | |
76 // Protects |policy_|. | |
77 base::Lock lock_; | |
78 | |
79 // Policy key-value information. | |
80 scoped_ptr<DictionaryValue> policy_; | |
81 | |
82 // Tracks whether the store received a SetPolicy() call, which overrides any | |
83 // information loaded from the file. | |
84 bool fresh_policy_; | |
85 | |
86 bool is_device_unmanaged_; | |
87 | |
88 // The time at which the policy was last refreshed. | |
89 base::Time last_policy_refresh_time_; | |
90 }; | |
91 | |
92 } // namespace policy | |
93 | |
94 #endif // CHROME_BROWSER_POLICY_DEVICE_MANAGEMENT_POLICY_CACHE_H_ | |
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