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Diffstat (limited to '')
| -rw-r--r-- | dom/media/eme/MediaKeySession.cpp | 622 |
1 files changed, 622 insertions, 0 deletions
diff --git a/dom/media/eme/MediaKeySession.cpp b/dom/media/eme/MediaKeySession.cpp new file mode 100644 index 0000000000..908df5f7c8 --- /dev/null +++ b/dom/media/eme/MediaKeySession.cpp @@ -0,0 +1,622 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this file, + * You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "mozilla/dom/MediaKeySession.h" + +#include <ctime> +#include <utility> + +#include "GMPUtils.h" +#include "mozilla/AsyncEventDispatcher.h" +#include "mozilla/CDMProxy.h" +#include "mozilla/EMEUtils.h" +#include "mozilla/Encoding.h" +#include "mozilla/dom/HTMLMediaElement.h" +#include "mozilla/dom/KeyIdsInitDataBinding.h" +#include "mozilla/dom/MediaEncryptedEvent.h" +#include "mozilla/dom/MediaKeyError.h" +#include "mozilla/dom/MediaKeyMessageEvent.h" +#include "mozilla/dom/MediaKeyStatusMap.h" +#include "mozilla/dom/MediaKeySystemAccess.h" +#include "nsCycleCollectionParticipant.h" +#include "nsPrintfCString.h" +#include "psshparser/PsshParser.h" + +namespace mozilla::dom { + +NS_IMPL_CYCLE_COLLECTION_INHERITED(MediaKeySession, DOMEventTargetHelper, + mMediaKeyError, mKeys, mKeyStatusMap, + mClosed) + +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaKeySession) +NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper) + +NS_IMPL_ADDREF_INHERITED(MediaKeySession, DOMEventTargetHelper) +NS_IMPL_RELEASE_INHERITED(MediaKeySession, DOMEventTargetHelper) + +// Count of number of instances. Used to give each instance a +// unique token. +static uint32_t sMediaKeySessionNum = 0; + +// Max length of keyId in EME "keyIds" or WebM init data format, as enforced +// by web platform tests. +static const uint32_t MAX_KEY_ID_LENGTH = 512; + +// Max length of CENC PSSH init data tolerated, as enforced by web +// platform tests. +static const uint32_t MAX_CENC_INIT_DATA_LENGTH = 64 * 1024; + +MediaKeySession::MediaKeySession(nsPIDOMWindowInner* aParent, MediaKeys* aKeys, + const nsAString& aKeySystem, + MediaKeySessionType aSessionType, + ErrorResult& aRv) + : DOMEventTargetHelper(aParent), + mKeys(aKeys), + mKeySystem(aKeySystem), + mSessionType(aSessionType), + mToken(sMediaKeySessionNum++), + mIsClosed(false), + mUninitialized(true), + mKeyStatusMap(new MediaKeyStatusMap(aParent)), + mExpiration(JS::GenericNaN()) { + EME_LOG("MediaKeySession[%p,''] ctor", this); + + MOZ_ASSERT(aParent); + if (aRv.Failed()) { + return; + } + mClosed = MakePromise(aRv, "MediaKeys.createSession"_ns); +} + +void MediaKeySession::SetSessionId(const nsAString& aSessionId) { + EME_LOG("MediaKeySession[%p,'%s'] session Id set", this, + NS_ConvertUTF16toUTF8(aSessionId).get()); + + if (NS_WARN_IF(!mSessionId.IsEmpty())) { + return; + } + mSessionId = aSessionId; + mKeys->OnSessionIdReady(this); +} + +MediaKeySession::~MediaKeySession() { + EME_LOG("MediaKeySession[%p,'%s'] dtor", this, + NS_ConvertUTF16toUTF8(mSessionId).get()); +} + +MediaKeyError* MediaKeySession::GetError() const { return mMediaKeyError; } + +void MediaKeySession::GetSessionId(nsString& aSessionId) const { + aSessionId = GetSessionId(); +} + +const nsString& MediaKeySession::GetSessionId() const { return mSessionId; } + +JSObject* MediaKeySession::WrapObject(JSContext* aCx, + JS::Handle<JSObject*> aGivenProto) { + return MediaKeySession_Binding::Wrap(aCx, this, aGivenProto); +} + +double MediaKeySession::Expiration() const { return mExpiration; } + +Promise* MediaKeySession::Closed() const { return mClosed; } + +void MediaKeySession::UpdateKeyStatusMap() { + MOZ_ASSERT(!IsClosed()); + if (!mKeys->GetCDMProxy()) { + return; + } + + nsTArray<CDMCaps::KeyStatus> keyStatuses; + { + auto caps = mKeys->GetCDMProxy()->Capabilites().Lock(); + caps->GetKeyStatusesForSession(mSessionId, keyStatuses); + } + + mKeyStatusMap->Update(keyStatuses); + + if (EME_LOG_ENABLED()) { + nsAutoCString message( + nsPrintfCString("MediaKeySession[%p,'%s'] key statuses change {", this, + NS_ConvertUTF16toUTF8(mSessionId).get())); + for (const CDMCaps::KeyStatus& status : keyStatuses) { + message.AppendPrintf( + " (%s,%s)", ToHexString(status.mId).get(), + nsCString(MediaKeyStatusValues::GetString(status.mStatus)).get()); + } + message.AppendLiteral(" }"); + // Use %s so we aren't exposing random strings to printf interpolation. + EME_LOG("%s", message.get()); + } +} + +MediaKeyStatusMap* MediaKeySession::KeyStatuses() const { + return mKeyStatusMap; +} + +// The user agent MUST thoroughly validate the Initialization Data before +// passing it to the CDM. This includes verifying that the length and +// values of fields are reasonable, verifying that values are within +// reasonable limits, and stripping irrelevant, unsupported, or unknown +// data or fields. It is RECOMMENDED that user agents pre-parse, sanitize, +// and/or generate a fully sanitized version of the Initialization Data. +// If the Initialization Data format specified by initDataType supports +// multiple entries, the user agent SHOULD remove entries that are not +// needed by the CDM. The user agent MUST NOT re-order entries within +// the Initialization Data. +static bool ValidateInitData(const nsTArray<uint8_t>& aInitData, + const nsAString& aInitDataType) { + if (aInitDataType.LowerCaseEqualsLiteral("webm")) { + // WebM initData consists of a single keyId. Ensure it's of reasonable + // length. + return aInitData.Length() <= MAX_KEY_ID_LENGTH; + } else if (aInitDataType.LowerCaseEqualsLiteral("cenc")) { + // Limit initData to less than 64KB. + if (aInitData.Length() > MAX_CENC_INIT_DATA_LENGTH) { + return false; + } + std::vector<std::vector<uint8_t>> keyIds; + return ParseCENCInitData(aInitData.Elements(), aInitData.Length(), keyIds); + } else if (aInitDataType.LowerCaseEqualsLiteral("keyids")) { + if (aInitData.Length() > MAX_KEY_ID_LENGTH) { + return false; + } + // Ensure that init data matches the expected JSON format. + mozilla::dom::KeyIdsInitData keyIds; + nsString json; + nsDependentCSubstring raw( + reinterpret_cast<const char*>(aInitData.Elements()), + aInitData.Length()); + if (NS_FAILED(UTF_8_ENCODING->DecodeWithBOMRemoval(raw, json))) { + return false; + } + if (!keyIds.Init(json)) { + return false; + } + if (keyIds.mKids.Length() == 0) { + return false; + } + for (const auto& kid : keyIds.mKids) { + if (kid.IsEmpty()) { + return false; + } + } + } + return true; +} + +// Generates a license request based on the initData. A message of type +// "license-request" or "individualization-request" will always be queued +// if the algorithm succeeds and the promise is resolved. +already_AddRefed<Promise> MediaKeySession::GenerateRequest( + const nsAString& aInitDataType, + const ArrayBufferViewOrArrayBuffer& aInitData, ErrorResult& aRv) { + RefPtr<DetailedPromise> promise( + MakePromise(aRv, "MediaKeySession.generateRequest"_ns)); + if (aRv.Failed()) { + return nullptr; + } + + // If this object is closed, return a promise rejected with an + // InvalidStateError. + if (IsClosed()) { + EME_LOG("MediaKeySession[%p,'%s'] GenerateRequest() failed, closed", this, + NS_ConvertUTF16toUTF8(mSessionId).get()); + promise->MaybeRejectWithInvalidStateError( + "Session is closed in MediaKeySession.generateRequest()"); + return promise.forget(); + } + + // If this object's uninitialized value is false, return a promise rejected + // with an InvalidStateError. + if (!mUninitialized) { + EME_LOG("MediaKeySession[%p,'%s'] GenerateRequest() failed, uninitialized", + this, NS_ConvertUTF16toUTF8(mSessionId).get()); + promise->MaybeRejectWithInvalidStateError( + "Session is already initialized in MediaKeySession.generateRequest()"); + return promise.forget(); + } + + // Let this object's uninitialized value be false. + mUninitialized = false; + + // If initDataType is the empty string, return a promise rejected + // with a newly created TypeError. + if (aInitDataType.IsEmpty()) { + promise->MaybeRejectWithTypeError( + "Empty initDataType passed to MediaKeySession.generateRequest()"); + EME_LOG( + "MediaKeySession[%p,'%s'] GenerateRequest() failed, empty initDataType", + this, NS_ConvertUTF16toUTF8(mSessionId).get()); + return promise.forget(); + } + + // If initData is an empty array, return a promise rejected with + // a newly created TypeError. + nsTArray<uint8_t> data; + CopyArrayBufferViewOrArrayBufferData(aInitData, data); + if (data.IsEmpty()) { + promise->MaybeRejectWithTypeError( + "Empty initData passed to MediaKeySession.generateRequest()"); + EME_LOG("MediaKeySession[%p,'%s'] GenerateRequest() failed, empty initData", + this, NS_ConvertUTF16toUTF8(mSessionId).get()); + return promise.forget(); + } + + // If the Key System implementation represented by this object's + // cdm implementation value does not support initDataType as an + // Initialization Data Type, return a promise rejected with a + // NotSupportedError. String comparison is case-sensitive. + if (!MediaKeySystemAccess::KeySystemSupportsInitDataType(mKeySystem, + aInitDataType)) { + promise->MaybeRejectWithNotSupportedError( + "Unsupported initDataType passed to MediaKeySession.generateRequest()"); + EME_LOG( + "MediaKeySession[%p,'%s'] GenerateRequest() failed, unsupported " + "initDataType", + this, NS_ConvertUTF16toUTF8(mSessionId).get()); + return promise.forget(); + } + + // Let init data be a copy of the contents of the initData parameter. + // Note: Handled by the CopyArrayBufferViewOrArrayBufferData call above. + + // Let session type be this object's session type. + + // Let promise be a new promise. + + // Run the following steps in parallel: + + // If the init data is not valid for initDataType, reject promise with + // a newly created TypeError. + if (!ValidateInitData(data, aInitDataType)) { + // If the preceding step failed, reject promise with a newly created + // TypeError. + promise->MaybeRejectWithTypeError( + "initData sanitization failed in MediaKeySession.generateRequest()"); + EME_LOG( + "MediaKeySession[%p,'%s'] GenerateRequest() initData sanitization " + "failed", + this, NS_ConvertUTF16toUTF8(mSessionId).get()); + return promise.forget(); + } + + // Let sanitized init data be a validated and sanitized version of init data. + + // If sanitized init data is empty, reject promise with a NotSupportedError. + + // Note: Remaining steps of generateRequest method continue in CDM. + + // Convert initData to hex for easier logging. + // Note: CreateSession() std::move()s the data out of the array, so we have + // to copy it here. + nsAutoCString hexInitData(ToHexString(data)); + PromiseId pid = mKeys->StorePromise(promise); + mKeys->ConnectPendingPromiseIdWithToken(pid, Token()); + mKeys->GetCDMProxy()->CreateSession(Token(), mSessionType, pid, aInitDataType, + data); + + EME_LOG( + "MediaKeySession[%p,'%s'] GenerateRequest() sent, " + "promiseId=%d initData='%s' initDataType='%s'", + this, NS_ConvertUTF16toUTF8(mSessionId).get(), pid, hexInitData.get(), + NS_ConvertUTF16toUTF8(aInitDataType).get()); + + return promise.forget(); +} + +already_AddRefed<Promise> MediaKeySession::Load(const nsAString& aSessionId, + ErrorResult& aRv) { + RefPtr<DetailedPromise> promise(MakePromise(aRv, "MediaKeySession.load"_ns)); + if (aRv.Failed()) { + return nullptr; + } + + // 1. If this object is closed, return a promise rejected with an + // InvalidStateError. + if (IsClosed()) { + promise->MaybeRejectWithInvalidStateError( + "Session is closed in MediaKeySession.load()"); + EME_LOG("MediaKeySession[%p,'%s'] Load() failed, closed", this, + NS_ConvertUTF16toUTF8(aSessionId).get()); + return promise.forget(); + } + + // 2.If this object's uninitialized value is false, return a promise rejected + // with an InvalidStateError. + if (!mUninitialized) { + promise->MaybeRejectWithInvalidStateError( + "Session is already initialized in MediaKeySession.load()"); + EME_LOG("MediaKeySession[%p,'%s'] Load() failed, uninitialized", this, + NS_ConvertUTF16toUTF8(aSessionId).get()); + return promise.forget(); + } + + // 3.Let this object's uninitialized value be false. + mUninitialized = false; + + // 4. If sessionId is the empty string, return a promise rejected with a newly + // created TypeError. + if (aSessionId.IsEmpty()) { + promise->MaybeRejectWithTypeError( + "Trying to load a session with empty session ID"); + // "The sessionId parameter is empty." + EME_LOG("MediaKeySession[%p,''] Load() failed, no sessionId", this); + return promise.forget(); + } + + // 5. If the result of running the Is persistent session type? algorithm + // on this object's session type is false, return a promise rejected with + // a newly created TypeError. + if (mSessionType == MediaKeySessionType::Temporary) { + promise->MaybeRejectWithTypeError( + "Trying to load() into a non-persistent session"); + EME_LOG( + "MediaKeySession[%p,''] Load() failed, can't load in a non-persistent " + "session", + this); + return promise.forget(); + } + + // Note: We don't support persistent sessions in any keysystem, so all calls + // to Load() should reject with a TypeError in the preceding check. Omitting + // implementing the rest of the specified MediaKeySession::Load() algorithm. + + // We now know the sessionId being loaded into this session. Remove the + // session from its owning MediaKey's set of sessions awaiting a sessionId. + RefPtr<MediaKeySession> session(mKeys->GetPendingSession(Token())); + MOZ_ASSERT(session == this, "Session should be awaiting id on its own token"); + + // Associate with the known sessionId. + SetSessionId(aSessionId); + + PromiseId pid = mKeys->StorePromise(promise); + mKeys->GetCDMProxy()->LoadSession(pid, mSessionType, aSessionId); + + EME_LOG("MediaKeySession[%p,'%s'] Load() sent to CDM, promiseId=%d", this, + NS_ConvertUTF16toUTF8(mSessionId).get(), pid); + + return promise.forget(); +} + +already_AddRefed<Promise> MediaKeySession::Update( + const ArrayBufferViewOrArrayBuffer& aResponse, ErrorResult& aRv) { + RefPtr<DetailedPromise> promise( + MakePromise(aRv, "MediaKeySession.update"_ns)); + if (aRv.Failed()) { + return nullptr; + } + + if (!IsCallable()) { + // If this object's callable value is false, return a promise rejected + // with a new DOMException whose name is InvalidStateError. + EME_LOG( + "MediaKeySession[%p,''] Update() called before sessionId set by CDM", + this); + promise->MaybeRejectWithInvalidStateError( + "MediaKeySession.Update() called before sessionId set by CDM"); + return promise.forget(); + } + + nsTArray<uint8_t> data; + if (IsClosed() || !mKeys->GetCDMProxy()) { + promise->MaybeRejectWithInvalidStateError( + "Session is closed or was not properly initialized"); + EME_LOG( + "MediaKeySession[%p,'%s'] Update() failed, session is closed or was " + "not properly initialised.", + this, NS_ConvertUTF16toUTF8(mSessionId).get()); + return promise.forget(); + } + CopyArrayBufferViewOrArrayBufferData(aResponse, data); + if (data.IsEmpty()) { + promise->MaybeRejectWithTypeError( + "Empty response buffer passed to MediaKeySession.update()"); + EME_LOG("MediaKeySession[%p,'%s'] Update() failed, empty response buffer", + this, NS_ConvertUTF16toUTF8(mSessionId).get()); + return promise.forget(); + } + + // Convert response to hex for easier logging. + // Note: UpdateSession() std::move()s the data out of the array, so we have + // to copy it here. + nsAutoCString hexResponse(ToHexString(data)); + + PromiseId pid = mKeys->StorePromise(promise); + mKeys->GetCDMProxy()->UpdateSession(mSessionId, pid, data); + + EME_LOG( + "MediaKeySession[%p,'%s'] Update() sent to CDM, " + "promiseId=%d Response='%s'", + this, NS_ConvertUTF16toUTF8(mSessionId).get(), pid, hexResponse.get()); + + return promise.forget(); +} + +already_AddRefed<Promise> MediaKeySession::Close(ErrorResult& aRv) { + RefPtr<DetailedPromise> promise(MakePromise(aRv, "MediaKeySession.close"_ns)); + if (aRv.Failed()) { + return nullptr; + } + // 1. Let session be the associated MediaKeySession object. + // 2. If session is closed, return a resolved promise. + if (IsClosed()) { + EME_LOG("MediaKeySession[%p,'%s'] Close() already closed", this, + NS_ConvertUTF16toUTF8(mSessionId).get()); + promise->MaybeResolveWithUndefined(); + return promise.forget(); + } + // 3. If session's callable value is false, return a promise rejected + // with an InvalidStateError. + if (!IsCallable()) { + EME_LOG("MediaKeySession[%p,''] Close() called before sessionId set by CDM", + this); + promise->MaybeRejectWithInvalidStateError( + "MediaKeySession.Close() called before sessionId set by CDM"); + return promise.forget(); + } + if (!mKeys->GetCDMProxy()) { + EME_LOG("MediaKeySession[%p,'%s'] Close() null CDMProxy", this, + NS_ConvertUTF16toUTF8(mSessionId).get()); + promise->MaybeRejectWithInvalidStateError( + "MediaKeySession.Close() lost reference to CDM"); + return promise.forget(); + } + // 4. Let promise be a new promise. + PromiseId pid = mKeys->StorePromise(promise); + // 5. Run the following steps in parallel: + // 5.1 Let cdm be the CDM instance represented by session's cdm instance + // value. 5.2 Use cdm to close the session associated with session. + mKeys->GetCDMProxy()->CloseSession(mSessionId, pid); + + EME_LOG("MediaKeySession[%p,'%s'] Close() sent to CDM, promiseId=%d", this, + NS_ConvertUTF16toUTF8(mSessionId).get(), pid); + + // Session Closed algorithm is run when CDM causes us to run + // OnSessionClosed(). + + // 6. Return promise. + return promise.forget(); +} + +void MediaKeySession::OnClosed() { + if (IsClosed()) { + return; + } + EME_LOG("MediaKeySession[%p,'%s'] session close operation complete.", this, + NS_ConvertUTF16toUTF8(mSessionId).get()); + mIsClosed = true; + mKeys->OnSessionClosed(this); + mKeys = nullptr; + mClosed->MaybeResolveWithUndefined(); +} + +bool MediaKeySession::IsClosed() const { return mIsClosed; } + +already_AddRefed<Promise> MediaKeySession::Remove(ErrorResult& aRv) { + RefPtr<DetailedPromise> promise( + MakePromise(aRv, "MediaKeySession.remove"_ns)); + if (aRv.Failed()) { + return nullptr; + } + if (!IsCallable()) { + // If this object's callable value is false, return a promise rejected + // with a new DOMException whose name is InvalidStateError. + EME_LOG( + "MediaKeySession[%p,''] Remove() called before sessionId set by CDM", + this); + promise->MaybeRejectWithInvalidStateError( + "MediaKeySession.Remove() called before sessionId set by CDM"); + return promise.forget(); + } + if (mSessionType != MediaKeySessionType::Persistent_license) { + promise->MaybeRejectWithInvalidAccessError( + "Calling MediaKeySession.remove() on non-persistent session"); + // "The operation is not supported on session type sessions." + EME_LOG("MediaKeySession[%p,'%s'] Remove() failed, sesion not persisrtent.", + this, NS_ConvertUTF16toUTF8(mSessionId).get()); + return promise.forget(); + } + if (IsClosed() || !mKeys->GetCDMProxy()) { + promise->MaybeRejectWithInvalidStateError( + "MediaKeySession.remove() called but session is not active"); + // "The session is closed." + EME_LOG("MediaKeySession[%p,'%s'] Remove() failed, already session closed.", + this, NS_ConvertUTF16toUTF8(mSessionId).get()); + return promise.forget(); + } + PromiseId pid = mKeys->StorePromise(promise); + mKeys->GetCDMProxy()->RemoveSession(mSessionId, pid); + EME_LOG("MediaKeySession[%p,'%s'] Remove() sent to CDM, promiseId=%d.", this, + NS_ConvertUTF16toUTF8(mSessionId).get(), pid); + + return promise.forget(); +} + +void MediaKeySession::DispatchKeyMessage(MediaKeyMessageType aMessageType, + const nsTArray<uint8_t>& aMessage) { + if (EME_LOG_ENABLED()) { + EME_LOG( + "MediaKeySession[%p,'%s'] DispatchKeyMessage() type=%s message='%s'", + this, NS_ConvertUTF16toUTF8(mSessionId).get(), + nsCString(MediaKeyMessageTypeValues::GetString(aMessageType)).get(), + ToHexString(aMessage).get()); + } + + RefPtr<MediaKeyMessageEvent> event( + MediaKeyMessageEvent::Constructor(this, aMessageType, aMessage)); + RefPtr<AsyncEventDispatcher> asyncDispatcher = + new AsyncEventDispatcher(this, event.forget()); + asyncDispatcher->PostDOMEvent(); +} + +void MediaKeySession::DispatchKeyError(uint32_t aSystemCode) { + EME_LOG("MediaKeySession[%p,'%s'] DispatchKeyError() systemCode=%u.", this, + NS_ConvertUTF16toUTF8(mSessionId).get(), aSystemCode); + + auto event = MakeRefPtr<MediaKeyError>(this, aSystemCode); + RefPtr<AsyncEventDispatcher> asyncDispatcher = + new AsyncEventDispatcher(this, event.forget()); + asyncDispatcher->PostDOMEvent(); +} + +void MediaKeySession::DispatchKeyStatusesChange() { + if (IsClosed()) { + return; + } + + UpdateKeyStatusMap(); + + RefPtr<AsyncEventDispatcher> asyncDispatcher = + new AsyncEventDispatcher(this, u"keystatuseschange"_ns, CanBubble::eNo); + asyncDispatcher->PostDOMEvent(); +} + +uint32_t MediaKeySession::Token() const { return mToken; } + +already_AddRefed<DetailedPromise> MediaKeySession::MakePromise( + ErrorResult& aRv, const nsACString& aName) { + nsCOMPtr<nsIGlobalObject> global = GetParentObject(); + if (!global) { + NS_WARNING("Passed non-global to MediaKeys ctor!"); + aRv.Throw(NS_ERROR_UNEXPECTED); + return nullptr; + } + return DetailedPromise::Create(global, aRv, aName); +} + +void MediaKeySession::SetExpiration(double aExpiration) { + EME_LOG("MediaKeySession[%p,'%s'] SetExpiry(%.12lf) (%.2lf hours from now)", + this, NS_ConvertUTF16toUTF8(mSessionId).get(), aExpiration, + (aExpiration - 1000.0 * double(time(0))) / (1000.0 * 60 * 60)); + mExpiration = aExpiration; +} + +EventHandlerNonNull* MediaKeySession::GetOnkeystatuseschange() { + return GetEventHandler(nsGkAtoms::onkeystatuseschange); +} + +void MediaKeySession::SetOnkeystatuseschange(EventHandlerNonNull* aCallback) { + SetEventHandler(nsGkAtoms::onkeystatuseschange, aCallback); +} + +EventHandlerNonNull* MediaKeySession::GetOnmessage() { + return GetEventHandler(nsGkAtoms::onmessage); +} + +void MediaKeySession::SetOnmessage(EventHandlerNonNull* aCallback) { + SetEventHandler(nsGkAtoms::onmessage, aCallback); +} + +nsCString ToCString(MediaKeySessionType aType) { + return nsCString(MediaKeySessionTypeValues::GetString(aType)); +} + +nsString ToString(MediaKeySessionType aType) { + return NS_ConvertUTF8toUTF16(ToCString(aType)); +} + +} // namespace mozilla::dom |