1 files changed, 100 insertions, 0 deletions
diff --git a/remote/cdp/observers/ChannelEventSink.sys.mjs b/remote/cdp/observers/ChannelEventSink.sys.mjs
new file mode 100644
index 0000000000..48e7c6ee64
--- /dev/null
+++ b/remote/cdp/observers/ChannelEventSink.sys.mjs
@@ -0,0 +1,100 @@
+/* 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/. */
+
+import { ComponentUtils } from "resource://gre/modules/ComponentUtils.sys.mjs";
+
+const Cm = Components.manager;
+
+/**
+ * This is a nsIChannelEventSink implementation that monitors channel redirects.
+ * This has been forked from:
+ * https://searchfox.org/mozilla-central/source/devtools/server/actors/network-monitor/channel-event-sink.js
+ * The rest of this module is also more or less forking:
+ * https://searchfox.org/mozilla-central/source/devtools/server/actors/network-monitor/network-observer.js
+ * TODO(try to re-unify /remote/ with /devtools code)
+ */
+const SINK_CLASS_DESCRIPTION = "NetworkMonitor Channel Event Sink";
+const SINK_CLASS_ID = Components.ID("{c2b4c83e-607a-405a-beab-0ef5dbfb7617}");
+const SINK_CONTRACT_ID = "@mozilla.org/network/monitor/channeleventsink;1";
+const SINK_CATEGORY_NAME = "net-channel-event-sinks";
+
+function ChannelEventSink() {
+  this.wrappedJSObject = this;
+  this.collectors = new Set();
+}
+
+ChannelEventSink.prototype = {
+  QueryInterface: ChromeUtils.generateQI(["nsIChannelEventSink"]),
+
+  registerCollector(collector) {
+    this.collectors.add(collector);
+  },
+
+  unregisterCollector(collector) {
+    this.collectors.delete(collector);
+
+    if (this.collectors.size == 0) {
+      ChannelEventSinkFactory.unregister();
+    }
+  },
+
+  // eslint-disable-next-line no-shadow
+  asyncOnChannelRedirect(oldChannel, newChannel, flags, callback) {
+    for (const collector of this.collectors) {
+      try {
+        collector._onChannelRedirect(oldChannel, newChannel, flags);
+      } catch (ex) {
+        console.error(
+          "StackTraceCollector.onChannelRedirect threw an exception",
+          ex
+        );
+      }
+    }
+    callback.onRedirectVerifyCallback(Cr.NS_OK);
+  },
+};
+
+export const ChannelEventSinkFactory =
+  ComponentUtils.generateSingletonFactory(ChannelEventSink);
+
+ChannelEventSinkFactory.register = function () {
+  const registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
+  if (registrar.isCIDRegistered(SINK_CLASS_ID)) {
+    return;
+  }
+
+  registrar.registerFactory(
+    SINK_CLASS_ID,
+    SINK_CLASS_DESCRIPTION,
+    SINK_CONTRACT_ID,
+    ChannelEventSinkFactory
+  );
+
+  Services.catMan.addCategoryEntry(
+    SINK_CATEGORY_NAME,
+    SINK_CONTRACT_ID,
+    SINK_CONTRACT_ID,
+    false,
+    true
+  );
+};
+
+ChannelEventSinkFactory.unregister = function () {
+  const registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
+  registrar.unregisterFactory(SINK_CLASS_ID, ChannelEventSinkFactory);
+
+  Services.catMan.deleteCategoryEntry(
+    SINK_CATEGORY_NAME,
+    SINK_CONTRACT_ID,
+    false
+  );
+};
+
+ChannelEventSinkFactory.getService = function () {
+  // Make sure the ChannelEventSink service is registered before accessing it
+  ChannelEventSinkFactory.register();
+
+  return Cc[SINK_CONTRACT_ID].getService(Ci.nsIChannelEventSink)
+    .wrappedJSObject;
+};