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| 1 // Copyright 2016 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 #include "content/common/bluetooth/web_bluetooth_device_id.h" |
| 6 |
| 7 #include "base/base64.h" |
| 8 #include "base/strings/string_util.h" |
| 9 #include "crypto/random.h" |
| 10 |
| 11 namespace content { |
| 12 |
| 13 namespace { |
| 14 |
| 15 enum { kDeviceIdLength = 16 /* 128 bits */ }; |
| 16 |
| 17 } // namespace |
| 18 |
| 19 WebBluetoothDeviceId::WebBluetoothDeviceId() {} |
| 20 |
| 21 WebBluetoothDeviceId::WebBluetoothDeviceId(std::string device_id) |
| 22 : device_id_(std::move(device_id)) { |
| 23 CHECK(IsValid(device_id_)); |
| 24 } |
| 25 |
| 26 WebBluetoothDeviceId::~WebBluetoothDeviceId() {} |
| 27 |
| 28 const std::string& WebBluetoothDeviceId::str() const { |
| 29 CHECK(IsValid(device_id_)); |
| 30 return device_id_; |
| 31 } |
| 32 |
| 33 // static |
| 34 WebBluetoothDeviceId WebBluetoothDeviceId::Create() { |
| 35 std::string bytes( |
| 36 kDeviceIdLength + 1 /* to avoid bytes being reallocated by WriteInto */, |
| 37 '\0'); |
| 38 |
| 39 crypto::RandBytes(base::WriteInto(&bytes /* str */, |
| 40 kDeviceIdLength + 1 /* length_with_null */), |
| 41 kDeviceIdLength); |
| 42 |
| 43 base::Base64Encode(bytes, &bytes); |
| 44 |
| 45 return WebBluetoothDeviceId(std::move(bytes)); |
| 46 } |
| 47 |
| 48 // static |
| 49 bool WebBluetoothDeviceId::IsValid(const std::string& device_id) { |
| 50 std::string decoded; |
| 51 if (!base::Base64Decode(device_id, &decoded)) { |
| 52 return false; |
| 53 } |
| 54 |
| 55 if (decoded.size() != kDeviceIdLength) { |
| 56 return false; |
| 57 } |
| 58 |
| 59 // When base64-encoding a 128bit string, only the two MSB are used for |
| 60 // the 3rd-to-last character. Because of this, the 3rd-to-last character |
| 61 // can only be one of this four characters. |
| 62 if (!(device_id[device_id.size() - 3] == 'A' || |
| 63 device_id[device_id.size() - 3] == 'Q' || |
| 64 device_id[device_id.size() - 3] == 'g' || |
| 65 device_id[device_id.size() - 3] == 'w')) { |
| 66 return false; |
| 67 } |
| 68 |
| 69 return true; |
| 70 } |
| 71 |
| 72 bool WebBluetoothDeviceId::operator==( |
| 73 const WebBluetoothDeviceId& device_id) const { |
| 74 return str() == device_id.str(); |
| 75 } |
| 76 |
| 77 bool WebBluetoothDeviceId::operator!=( |
| 78 const WebBluetoothDeviceId& device_id) const { |
| 79 return !(*this == device_id); |
| 80 } |
| 81 |
| 82 std::ostream& operator<<(std::ostream& out, |
| 83 const WebBluetoothDeviceId& device_id) { |
| 84 return out << device_id.str(); |
| 85 } |
| 86 |
| 87 } // namespace content |
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