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-rw-r--r--dom/html/MediaError.cpp85
1 files changed, 85 insertions, 0 deletions
diff --git a/dom/html/MediaError.cpp b/dom/html/MediaError.cpp
new file mode 100644
index 0000000000..819e1745c6
--- /dev/null
+++ b/dom/html/MediaError.cpp
@@ -0,0 +1,85 @@
+/* -*- 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/MediaError.h"
+
+#include <string>
+#include <unordered_set>
+
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/MediaErrorBinding.h"
+#include "nsContentUtils.h"
+#include "nsIScriptError.h"
+#include "jsapi.h"
+#include "js/Warnings.h" // JS::WarnASCII
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(MediaError, mParent)
+NS_IMPL_CYCLE_COLLECTING_ADDREF(MediaError)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(MediaError)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaError)
+ NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+ NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+MediaError::MediaError(HTMLMediaElement* aParent, uint16_t aCode,
+ const nsACString& aMessage)
+ : mParent(aParent), mCode(aCode), mMessage(aMessage) {}
+
+void MediaError::GetMessage(nsAString& aResult) const {
+ // When fingerprinting resistance is enabled, only messages in this list
+ // can be returned to content script.
+ // FIXME: An unordered_set seems overkill for this.
+ static const std::unordered_set<std::string> whitelist = {
+ "404: Not Found"
+ // TODO
+ };
+
+ const bool shouldBlank = whitelist.find(mMessage.get()) == whitelist.end();
+
+ if (shouldBlank) {
+ // Print a warning message to JavaScript console to alert developers of
+ // a non-whitelisted error message.
+ nsAutoCString message =
+ nsLiteralCString(
+ "This error message will be blank when "
+ "privacy.resistFingerprinting = true."
+ " If it is really necessary, please add it to the whitelist in"
+ " MediaError::GetMessage: ") +
+ mMessage;
+ Document* ownerDoc = mParent->OwnerDoc();
+ AutoJSAPI api;
+ if (api.Init(ownerDoc->GetScopeObject())) {
+ // We prefer this API because it can also print to our debug log and
+ // try server's log viewer.
+ JS::WarnASCII(api.cx(), "%s", message.get());
+ } else {
+ // If failed to use JS::WarnASCII, fall back to
+ // nsContentUtils::ReportToConsoleNonLocalized, which can only print to
+ // JavaScript console.
+ nsContentUtils::ReportToConsoleNonLocalized(
+ NS_ConvertASCIItoUTF16(message), nsIScriptError::warningFlag,
+ "MediaError"_ns, ownerDoc);
+ }
+
+ if (!nsContentUtils::IsCallerChrome() &&
+ ownerDoc->ShouldResistFingerprinting(RFPTarget::MediaError)) {
+ aResult.Truncate();
+ return;
+ }
+ }
+
+ CopyUTF8toUTF16(mMessage, aResult);
+}
+
+JSObject* MediaError::WrapObject(JSContext* aCx,
+ JS::Handle<JSObject*> aGivenProto) {
+ return MediaError_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+} // namespace mozilla::dom