Bug 1310879 - Check that only supported session types are instantiated. r=gerald

MozReview-Commit-ID: 6XkToIXzZL8

--HG--
extra : source : d1c0a7a2ff25005de82033081bee5eb10adea0c8

dom/media/eme/MediaKeys.cpp

@@ -441,11 +441,39 @@ MediaKeys::OnCDMCreated(PromiseId aId, const nsACString& aNodeId, const uint32_t
   Telemetry::Accumulate(Telemetry::VIDEO_CDM_CREATED, ToCDMTypeTelemetryEnum(mKeySystem));
 }
 
+static bool
+IsSessionTypeSupported(const MediaKeySessionType aSessionType,
+                       const MediaKeySystemConfiguration& aConfig)
+{
+  if (aSessionType == MediaKeySessionType::Temporary) {
+    // Temporary is always supported.
+    return true;
+  }
+  if (!aConfig.mSessionTypes.WasPassed()) {
+    // No other session types supported.
+    return false;
+  }
+  using MediaKeySessionTypeValues::strings;
+  const char* sessionType = strings[static_cast<uint32_t>(aSessionType)].value;
+  for (const nsString& s : aConfig.mSessionTypes.Value()) {
+    if (s.EqualsASCII(sessionType)) {
+      return true;
+    }
+  }
+  return false;
+}
+
 already_AddRefed<MediaKeySession>
 MediaKeys::CreateSession(JSContext* aCx,
                          MediaKeySessionType aSessionType,
                          ErrorResult& aRv)
 {
+  if (!IsSessionTypeSupported(aSessionType, mConfig)) {
+    EME_LOG("MediaKeys[%p,'%s'] CreateSession() failed, unsupported session type", this);
+    aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+    return nullptr;
+  }
+
   if (!mProxy) {
     NS_WARNING("Tried to use a MediaKeys which lost its CDM");
     aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);

dom/media/test/test_eme_initDataTypes.html

@@ -42,7 +42,7 @@ var tests = [
     initData: '{"type":"persistent-license", "kids":["LwVHf8JLtPrv2GUXFW2v_A", "0DdtU9od-Bh5L3xbv0Xf_A"]}',
     expectedRequest: '{"kids":["LwVHf8JLtPrv2GUXFW2v_A","0DdtU9od-Bh5L3xbv0Xf_A"],"type":"persistent-license"}',
     sessionType: 'persistent-license',
-    expectPass: true,
+    expectPass: false,
   },
   {
     name: "Invalid keyId",