1/*
2 * Copyright (C) 2016 Metrological Group B.V.
3 * Copyright (C) 2016 Igalia S.L.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following
13 * disclaimer in the documentation and/or other materials provided
14 * with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "config.h"
30#include "NavigatorEME.h"
31
32#if ENABLE(ENCRYPTED_MEDIA)
33
34#include "CDM.h"
35#include "Document.h"
36#include "JSMediaKeySystemAccess.h"
37#include "Logging.h"
38
39namespace WebCore {
40
41static void tryNextSupportedConfiguration(RefPtr<CDM>&& implementation, Vector<MediaKeySystemConfiguration>&& supportedConfigurations, RefPtr<DeferredPromise>&&);
42
43void NavigatorEME::requestMediaKeySystemAccess(Navigator&, Document& document, const String& keySystem, Vector<MediaKeySystemConfiguration>&& supportedConfigurations, Ref<DeferredPromise>&& promise)
44{
45 // https://w3c.github.io/encrypted-media/#dom-navigator-requestmediakeysystemaccess
46 // W3C Editor's Draft 09 November 2016
47 LOG(EME, "EME - request media key system access for %s", keySystem.utf8().data());
48
49 // When this method is invoked, the user agent must run the following steps:
50 // 1. If keySystem is the empty string, return a promise rejected with a newly created TypeError.
51 // 2. If supportedConfigurations is empty, return a promise rejected with a newly created TypeError.
52 if (keySystem.isEmpty() || supportedConfigurations.isEmpty()) {
53 promise->reject(TypeError);
54 return;
55 }
56
57 document.postTask([keySystem, supportedConfigurations = WTFMove(supportedConfigurations), promise = WTFMove(promise), &document] (ScriptExecutionContext&) mutable {
58 // 3. Let document be the calling context's Document.
59 // 4. Let origin be the origin of document.
60 // 5. Let promise be a new promise.
61 // 6. Run the following steps in parallel:
62 // 6.1. If keySystem is not one of the Key Systems supported by the user agent, reject promise with a NotSupportedError.
63 // String comparison is case-sensitive.
64 if (!CDM::supportsKeySystem(keySystem)) {
65 LOG(EME, "EME - %s is not supported", keySystem.utf8().data());
66 promise->reject(NotSupportedError);
67 return;
68 }
69
70 // 6.2. Let implementation be the implementation of keySystem.
71 auto implementation = CDM::create(document, keySystem);
72 tryNextSupportedConfiguration(WTFMove(implementation), WTFMove(supportedConfigurations), WTFMove(promise));
73 });
74}
75
76static void tryNextSupportedConfiguration(RefPtr<CDM>&& implementation, Vector<MediaKeySystemConfiguration>&& supportedConfigurations, RefPtr<DeferredPromise>&& promise)
77{
78 // 6.3. For each value in supportedConfigurations:
79 if (!supportedConfigurations.isEmpty()) {
80 // 6.3.1. Let candidate configuration be the value.
81 // 6.3.2. Let supported configuration be the result of executing the Get Supported Configuration
82 // algorithm on implementation, candidate configuration, and origin.
83 MediaKeySystemConfiguration candidateConfiguration = WTFMove(supportedConfigurations.first());
84 supportedConfigurations.remove(0);
85
86 CDM::SupportedConfigurationCallback callback = [implementation = implementation, supportedConfigurations = WTFMove(supportedConfigurations), promise] (Optional<MediaKeySystemConfiguration> supportedConfiguration) mutable {
87 // 6.3.3. If supported configuration is not NotSupported, run the following steps:
88 if (supportedConfiguration) {
89 // 6.3.3.1. Let access be a new MediaKeySystemAccess object, and initialize it as follows:
90 // 6.3.3.1.1. Set the keySystem attribute to keySystem.
91 // 6.3.3.1.2. Let the configuration value be supported configuration.
92 // 6.3.3.1.3. Let the cdm implementation value be implementation.
93
94 // Obtain reference to the key system string before the `implementation` RefPtr<> is cleared out.
95 const String& keySystem = implementation->keySystem();
96 auto access = MediaKeySystemAccess::create(keySystem, WTFMove(supportedConfiguration.value()), implementation.releaseNonNull());
97
98 // 6.3.3.2. Resolve promise with access and abort the parallel steps of this algorithm.
99 promise->resolveWithNewlyCreated<IDLInterface<MediaKeySystemAccess>>(WTFMove(access));
100 return;
101 }
102
103 tryNextSupportedConfiguration(WTFMove(implementation), WTFMove(supportedConfigurations), WTFMove(promise));
104 };
105 implementation->getSupportedConfiguration(WTFMove(candidateConfiguration), WTFMove(callback));
106 return;
107 }
108
109
110 // 6.4. Reject promise with a NotSupportedError.
111 promise->reject(NotSupportedError);
112}
113
114} // namespace WebCore
115
116#endif // ENABLE(ENCRYPTED_MEDIA)
117