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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_ENCRYPTEDMEDIA_CONTENT_DECRYPTION_MODULE_RESULT_PROMISE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_ENCRYPTEDMEDIA_CONTENT_DECRYPTION_MODULE_RESULT_PROMISE_H_
#include "third_party/blink/public/platform/web_encrypted_media_key_information.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/platform/bindings/exception_code.h"
#include "third_party/blink/renderer/platform/content_decryption_module_result.h"
namespace blink {
ExceptionCode WebCdmExceptionToExceptionCode(
WebContentDecryptionModuleException);
// This class wraps the promise resolver to simplify creation of
// ContentDecryptionModuleResult objects. The default implementations of the
// complete(), completeWithSession(), etc. methods will reject the promise
// with an error. It needs to be subclassed and the appropriate complete()
// method overridden to resolve the promise as needed.
//
// Subclasses need to keep a Member<> to the object that created them so
// that the creator remains around as long as this promise is pending. This
// promise is not referenced by the object that created it (e.g MediaKeys,
// MediaKeySession, Navigator.requestMediaKeySystemAccess), so this promise
// may be cleaned up before or after it's creator once both become unreachable.
// If it is after, the destruction of the creator may trigger this promise,
// so use isValidToFulfillPromise() to verify that it is safe to fulfill
// the promise.
class ContentDecryptionModuleResultPromise
: public ContentDecryptionModuleResult {
public:
~ContentDecryptionModuleResultPromise() override;
// ContentDecryptionModuleResult implementation.
void Complete() override;
void CompleteWithContentDecryptionModule(
WebContentDecryptionModule*) override;
void CompleteWithSession(
WebContentDecryptionModuleResult::SessionStatus) override;
void CompleteWithKeyStatus(
WebEncryptedMediaKeyInformation::KeyStatus) override;
void CompleteWithError(WebContentDecryptionModuleException,
uint32_t system_code,
const WebString&) override;
// It is only valid to call this before completion.
ScriptPromise Promise();
void Trace(blink::Visitor*) override;
protected:
// |interface_name| and |property_name| must have static life time.
explicit ContentDecryptionModuleResultPromise(ScriptState*,
const char* interface_name,
const char* property_name);
// Resolves the promise with |value|. Used by subclasses to resolve the
// promise.
template <typename... T>
void Resolve(T... value) {
DCHECK(IsValidToFulfillPromise());
resolver_->Resolve(value...);
resolver_.Clear();
}
// Rejects the promise with a DOMException.
void Reject(ExceptionCode, const String& error_message);
ExecutionContext* GetExecutionContext() const;
// Determine if it's OK to resolve/reject this promise.
bool IsValidToFulfillPromise();
private:
Member<ScriptPromiseResolver> resolver_;
const char* const interface_name_;
const char* const property_name_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_ENCRYPTEDMEDIA_CONTENT_DECRYPTION_MODULE_RESULT_PROMISE_H_
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