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      1 /*
      2  * Copyright (C) 2013 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef MediaKeys_h
     27 #define MediaKeys_h
     28 
     29 #include "bindings/core/v8/ScriptPromise.h"
     30 #include "bindings/core/v8/ScriptWrappable.h"
     31 #include "core/dom/ContextLifecycleObserver.h"
     32 #include "wtf/Forward.h"
     33 #include "wtf/text/WTFString.h"
     34 
     35 namespace blink {
     36 
     37 class ExceptionState;
     38 class ExecutionContext;
     39 class HTMLMediaElement;
     40 class MediaKeySession;
     41 class ScriptState;
     42 class WebContentDecryptionModule;
     43 
     44 // References are held by JS and HTMLMediaElement.
     45 // The WebContentDecryptionModule has the same lifetime as this object.
     46 class MediaKeys : public GarbageCollectedFinalized<MediaKeys>, public ContextLifecycleObserver, public ScriptWrappable {
     47     DEFINE_WRAPPERTYPEINFO();
     48 public:
     49     static ScriptPromise create(ScriptState*, const String& keySystem);
     50     virtual ~MediaKeys();
     51 
     52     const String& keySystem() const { return m_keySystem; }
     53 
     54     MediaKeySession* createSession(ScriptState*, const String& sessionType);
     55 
     56     static bool isTypeSupported(const String& keySystem, const String& contentType);
     57 
     58     blink::WebContentDecryptionModule* contentDecryptionModule();
     59 
     60     void trace(Visitor*);
     61 
     62     // ContextLifecycleObserver
     63     virtual void contextDestroyed() OVERRIDE;
     64 
     65 private:
     66     friend class MediaKeysInitializer;
     67     MediaKeys(ExecutionContext*, const String& keySystem, PassOwnPtr<blink::WebContentDecryptionModule>);
     68 
     69     const String m_keySystem;
     70     OwnPtr<blink::WebContentDecryptionModule> m_cdm;
     71 };
     72 
     73 } // namespace blink
     74 
     75 #endif // MediaKeys_h
     76