import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/media/eme/MediaKeySession.cpp

@@ -0,0 +1,674 @@
+/* -*- 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/HTMLMediaElement.h"
+#include "mozilla/dom/MediaKeySession.h"
+#include "mozilla/dom/MediaKeyError.h"
+#include "mozilla/dom/MediaKeyMessageEvent.h"
+#include "mozilla/dom/MediaEncryptedEvent.h"
+#include "mozilla/dom/MediaKeyStatusMap.h"
+#include "mozilla/dom/MediaKeySystemAccess.h"
+#include "mozilla/dom/KeyIdsInitDataBinding.h"
+#include "nsCycleCollectionParticipant.h"
+#include "mozilla/CDMProxy.h"
+#include "mozilla/AsyncEventDispatcher.h"
+#include "mozilla/Move.h"
+#include "nsContentUtils.h"
+#include "mozilla/EMEUtils.h"
+#include "GMPUtils.h"
+#include "nsPrintfCString.h"
+#include "psshparser/PsshParser.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(MediaKeySession,
+                                   DOMEventTargetHelper,
+                                   mMediaKeyError,
+                                   mKeys,
+                                   mKeyStatusMap,
+                                   mClosed)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(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(JSContext* aCx,
+                                 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, NS_LITERAL_CSTRING("MediaKeys.createSession"));
+}
+
+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()
+{
+}
+
+MediaKeyError*
+MediaKeySession::GetError() const
+{
+  return mMediaKeyError;
+}
+
+void
+MediaKeySession::GetKeySystem(nsString& aOutKeySystem) const
+{
+  aOutKeySystem.Assign(mKeySystem);
+}
+
+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 MediaKeySessionBinding::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;
+  {
+    CDMCaps::AutoLock caps(mKeys->GetCDMProxy()->Capabilites());
+    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()));
+    using IntegerType = typename std::underlying_type<MediaKeyStatus>::type;
+    for (const CDMCaps::KeyStatus& status : keyStatuses) {
+      message.Append(nsPrintfCString(" (%s,%s)", ToBase64(status.mId).get(),
+        MediaKeyStatusValues::strings[static_cast<IntegerType>(status.mStatus)].value));
+    }
+    message.Append(" }");
+    EME_LOG(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(nsContentUtils::ConvertStringFromEncoding(NS_LITERAL_CSTRING("UTF-8"), 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,
+    NS_LITERAL_CSTRING("MediaKeySession.generateRequest")));
+  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->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR,
+      NS_LITERAL_CSTRING("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->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR,
+      NS_LITERAL_CSTRING("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->MaybeReject(NS_ERROR_DOM_TYPE_ERR,
+      NS_LITERAL_CSTRING("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->MaybeReject(NS_ERROR_DOM_TYPE_ERR,
+      NS_LITERAL_CSTRING("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->MaybeReject(NS_ERROR_DOM_NOT_SUPPORTED_ERR,
+      NS_LITERAL_CSTRING("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->MaybeReject(NS_ERROR_DOM_TYPE_ERR,
+      NS_LITERAL_CSTRING("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.
+
+  Telemetry::Accumulate(Telemetry::VIDEO_CDM_GENERATE_REQUEST_CALLED,
+                        ToCDMTypeTelemetryEnum(mKeySystem));
+
+  // Convert initData to base64 for easier logging.
+  // Note: CreateSession() Move()s the data out of the array, so we have
+  // to copy it here.
+  nsAutoCString base64InitData(ToBase64(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(base64)='%s' initDataType='%s'",
+          this,
+          NS_ConvertUTF16toUTF8(mSessionId).get(),
+          pid,
+          base64InitData.get(),
+          NS_ConvertUTF16toUTF8(aInitDataType).get());
+
+  return promise.forget();
+}
+
+already_AddRefed<Promise>
+MediaKeySession::Load(const nsAString& aSessionId, ErrorResult& aRv)
+{
+  RefPtr<DetailedPromise> promise(MakePromise(aRv,
+    NS_LITERAL_CSTRING("MediaKeySession.load")));
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  // 1. If this object is closed, return a promise rejected with an InvalidStateError.
+  if (IsClosed()) {
+    promise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR,
+                         NS_LITERAL_CSTRING("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->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR,
+                         NS_LITERAL_CSTRING("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->MaybeReject(NS_ERROR_DOM_TYPE_ERR,
+                         NS_LITERAL_CSTRING("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->MaybeReject(NS_ERROR_DOM_TYPE_ERR,
+                         NS_LITERAL_CSTRING("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, 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,
+    NS_LITERAL_CSTRING("MediaKeySession.update")));
+  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->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR,
+      NS_LITERAL_CSTRING("MediaKeySession.Update() called before sessionId set by CDM"));
+    return promise.forget();
+  }
+
+  nsTArray<uint8_t> data;
+  if (IsClosed() || !mKeys->GetCDMProxy()) {
+    promise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR,
+                         NS_LITERAL_CSTRING("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->MaybeReject(NS_ERROR_DOM_TYPE_ERR,
+      NS_LITERAL_CSTRING("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 base64 for easier logging.
+  // Note: UpdateSession() Move()s the data out of the array, so we have
+  // to copy it here.
+  nsAutoCString base64Response(ToBase64(data));
+
+  PromiseId pid = mKeys->StorePromise(promise);
+  mKeys->GetCDMProxy()->UpdateSession(mSessionId,
+                                      pid,
+                                      data);
+
+  EME_LOG("MediaKeySession[%p,'%s'] Update() sent to CDM, "
+          "promiseId=%d Response(base64)='%s'",
+           this,
+           NS_ConvertUTF16toUTF8(mSessionId).get(),
+           pid,
+           base64Response.get());
+
+  return promise.forget();
+}
+
+already_AddRefed<Promise>
+MediaKeySession::Close(ErrorResult& aRv)
+{
+  RefPtr<DetailedPromise> promise(MakePromise(aRv,
+    NS_LITERAL_CSTRING("MediaKeySession.close")));
+  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->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR,
+      NS_LITERAL_CSTRING("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->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR,
+      NS_LITERAL_CSTRING("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,
+    NS_LITERAL_CSTRING("MediaKeySession.remove")));
+  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->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR,
+      NS_LITERAL_CSTRING("MediaKeySession.Remove() called before sessionId set by CDM"));
+    return promise.forget();
+  }
+  if (mSessionType != MediaKeySessionType::Persistent_license) {
+    promise->MaybeReject(NS_ERROR_DOM_INVALID_ACCESS_ERR,
+                         NS_LITERAL_CSTRING("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->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR,
+                         NS_LITERAL_CSTRING("MediaKeySesison.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(base64)='%s'",
+            this, NS_ConvertUTF16toUTF8(mSessionId).get(),
+            MediaKeyMessageTypeValues::strings[uint32_t(aMessageType)].value,
+            ToBase64(aMessage).get());
+  }
+
+  RefPtr<MediaKeyMessageEvent> event(
+    MediaKeyMessageEvent::Constructor(this, aMessageType, aMessage));
+  RefPtr<AsyncEventDispatcher> asyncDispatcher =
+    new AsyncEventDispatcher(this, event);
+  asyncDispatcher->PostDOMEvent();
+}
+
+void
+MediaKeySession::DispatchKeyError(uint32_t aSystemCode)
+{
+  EME_LOG("MediaKeySession[%p,'%s'] DispatchKeyError() systemCode=%u.",
+          this, NS_ConvertUTF16toUTF8(mSessionId).get(), aSystemCode);
+
+  RefPtr<MediaKeyError> event(new MediaKeyError(this, aSystemCode));
+  RefPtr<AsyncEventDispatcher> asyncDispatcher =
+    new AsyncEventDispatcher(this, event);
+  asyncDispatcher->PostDOMEvent();
+}
+
+void
+MediaKeySession::DispatchKeyStatusesChange()
+{
+  if (IsClosed()) {
+    return;
+  }
+
+  UpdateKeyStatusMap();
+
+  RefPtr<AsyncEventDispatcher> asyncDispatcher =
+    new AsyncEventDispatcher(this, NS_LITERAL_STRING("keystatuseschange"), false);
+  asyncDispatcher->PostDOMEvent();
+}
+
+uint32_t
+MediaKeySession::Token() const
+{
+  return mToken;
+}
+
+already_AddRefed<DetailedPromise>
+MediaKeySession::MakePromise(ErrorResult& aRv, const nsACString& aName)
+{
+  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(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(%lf)",
+          this,
+          NS_ConvertUTF16toUTF8(mSessionId).get(),
+          aExpiration);
+  mExpiration = aExpiration;
+}
+
+EventHandlerNonNull*
+MediaKeySession::GetOnkeystatuseschange()
+{
+  return GetEventHandler(nsGkAtoms::onkeystatuseschange, EmptyString());
+}
+
+void
+MediaKeySession::SetOnkeystatuseschange(EventHandlerNonNull* aCallback)
+{
+  SetEventHandler(nsGkAtoms::onkeystatuseschange, EmptyString(), aCallback);
+}
+
+EventHandlerNonNull*
+MediaKeySession::GetOnmessage()
+{
+  return GetEventHandler(nsGkAtoms::onmessage, EmptyString());
+}
+
+void
+MediaKeySession::SetOnmessage(EventHandlerNonNull* aCallback)
+{
+  SetEventHandler(nsGkAtoms::onmessage, EmptyString(), aCallback);
+}
+
+} // namespace dom
+} // namespace mozilla