Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1397 insertions, 0 deletions

diff --git a/devtools/shared/network-observer/NetworkObserver.sys.mjs b/devtools/shared/network-observer/NetworkObserver.sys.mjs
new file mode 100644
index 0000000000..7137345393
--- /dev/null
+++ b/devtools/shared/network-observer/NetworkObserver.sys.mjs
@@ -0,0 +1,1397 @@
+/* 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/. */
+
+/**
+ * NetworkObserver is the main class in DevTools to observe network requests
+ * out of many events fired by the platform code.
+ */
+
+// Enable logging all platform events this module listen to
+const DEBUG_PLATFORM_EVENTS = false;
+
+const lazy = {};
+
+import { DevToolsInfaillibleUtils } from "resource://devtools/shared/DevToolsInfaillibleUtils.sys.mjs";
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  ChannelMap: "resource://devtools/shared/network-observer/ChannelMap.sys.mjs",
+  NetworkHelper:
+    "resource://devtools/shared/network-observer/NetworkHelper.sys.mjs",
+  NetworkOverride:
+    "resource://devtools/shared/network-observer/NetworkOverride.sys.mjs",
+  NetworkResponseListener:
+    "resource://devtools/shared/network-observer/NetworkResponseListener.sys.mjs",
+  NetworkThrottleManager:
+    "resource://devtools/shared/network-observer/NetworkThrottleManager.sys.mjs",
+  NetworkUtils:
+    "resource://devtools/shared/network-observer/NetworkUtils.sys.mjs",
+  wildcardToRegExp:
+    "resource://devtools/shared/network-observer/WildcardToRegexp.sys.mjs",
+});
+
+const gActivityDistributor = Cc[
+  "@mozilla.org/network/http-activity-distributor;1"
+].getService(Ci.nsIHttpActivityDistributor);
+
+function logPlatformEvent(eventName, channel, message = "") {
+  if (!DEBUG_PLATFORM_EVENTS) {
+    return;
+  }
+  dump(`[netmonitor] ${channel.channelId} - ${eventName} ${message}\n`);
+}
+
+// The maximum uint32 value.
+const PR_UINT32_MAX = 4294967295;
+
+const HTTP_TRANSACTION_CODES = {
+  0x5001: "REQUEST_HEADER",
+  0x5002: "REQUEST_BODY_SENT",
+  0x5003: "RESPONSE_START",
+  0x5004: "RESPONSE_HEADER",
+  0x5005: "RESPONSE_COMPLETE",
+  0x5006: "TRANSACTION_CLOSE",
+
+  0x4b0003: "STATUS_RESOLVING",
+  0x4b000b: "STATUS_RESOLVED",
+  0x4b0007: "STATUS_CONNECTING_TO",
+  0x4b0004: "STATUS_CONNECTED_TO",
+  0x4b0005: "STATUS_SENDING_TO",
+  0x4b000a: "STATUS_WAITING_FOR",
+  0x4b0006: "STATUS_RECEIVING_FROM",
+  0x4b000c: "STATUS_TLS_STARTING",
+  0x4b000d: "STATUS_TLS_ENDING",
+};
+
+const HTTP_DOWNLOAD_ACTIVITIES = [
+  gActivityDistributor.ACTIVITY_SUBTYPE_RESPONSE_START,
+  gActivityDistributor.ACTIVITY_SUBTYPE_RESPONSE_HEADER,
+  gActivityDistributor.ACTIVITY_SUBTYPE_RESPONSE_COMPLETE,
+  gActivityDistributor.ACTIVITY_SUBTYPE_TRANSACTION_CLOSE,
+];
+
+/**
+ * The network monitor uses the nsIHttpActivityDistributor to monitor network
+ * requests. The nsIObserverService is also used for monitoring
+ * http-on-examine-response notifications. All network request information is
+ * routed to the remote Web Console.
+ *
+ * @constructor
+ * @param {Object} options
+ * @param {Function(nsIChannel): boolean} options.ignoreChannelFunction
+ *        This function will be called for every detected channel to decide if it
+ *        should be monitored or not.
+ * @param {Function(NetworkEvent): owner} options.onNetworkEvent
+ *        This method is invoked once for every new network request with two
+ *        arguments:
+ *        - {Object} networkEvent: object created by NetworkUtils:createNetworkEvent,
+ *          containing initial network request information as an argument.
+ *        - {nsIChannel} channel: the channel for which the request was detected
+ *
+ *        `onNetworkEvent()` must return an "owner" object which holds several add*()
+ *        methods which are used to add further network request/response information.
+ */
+export class NetworkObserver {
+  /**
+   * Map of URL patterns to RegExp
+   *
+   * @type {Map}
+   */
+  #blockedURLs = new Map();
+
+  /**
+   * Map of URL to local file path in order to redirect URL
+   * to local file overrides.
+   *
+   * This will replace the content of some request with the content of local files.
+   */
+  #overrides = new Map();
+
+  /**
+   * Used by NetworkHelper.parseSecurityInfo to skip decoding known certificates.
+   *
+   * @type {Map}
+   */
+  #decodedCertificateCache = new Map();
+  /**
+   * See constructor argument of the same name.
+   *
+   * @type {Function}
+   */
+  #ignoreChannelFunction;
+  /**
+   * Used to store channels intercepted for service-worker requests.
+   *
+   * @type {WeakSet}
+   */
+  #interceptedChannels = new WeakSet();
+  /**
+   * Explicit flag to check if this observer was already destroyed.
+   *
+   * @type {boolean}
+   */
+  #isDestroyed = false;
+  /**
+   * See constructor argument of the same name.
+   *
+   * @type {Function}
+   */
+  #onNetworkEvent;
+  /**
+   * Object that holds the HTTP activity objects for ongoing requests.
+   *
+   * @type {ChannelMap}
+   */
+  #openRequests = new lazy.ChannelMap();
+  /**
+   * Network response bodies are piped through a buffer of the given size
+   * (in bytes).
+   *
+   * @type {Number}
+   */
+  #responsePipeSegmentSize = Services.prefs.getIntPref(
+    "network.buffer.cache.size"
+  );
+  /**
+   * Whether to save the bodies of network requests and responses.
+   *
+   * @type {boolean}
+   */
+  #saveRequestAndResponseBodies = true;
+  /**
+   * Throttling configuration, see constructor of NetworkThrottleManager
+   *
+   * @type {Object}
+   */
+  #throttleData = null;
+  /**
+   * NetworkThrottleManager instance, created when a valid throttleData is set.
+   * @type {NetworkThrottleManager}
+   */
+  #throttler = null;
+
+  constructor(options = {}) {
+    const { ignoreChannelFunction, onNetworkEvent } = options;
+    if (typeof ignoreChannelFunction !== "function") {
+      throw new Error(
+        `Expected "ignoreChannelFunction" to be a function, got ${ignoreChannelFunction} (${typeof ignoreChannelFunction})`
+      );
+    }
+
+    if (typeof onNetworkEvent !== "function") {
+      throw new Error(
+        `Expected "onNetworkEvent" to be a function, got ${onNetworkEvent} (${typeof onNetworkEvent})`
+      );
+    }
+
+    this.#ignoreChannelFunction = ignoreChannelFunction;
+    this.#onNetworkEvent = onNetworkEvent;
+
+    // Start all platform observers.
+    if (Services.appinfo.processType != Ci.nsIXULRuntime.PROCESS_TYPE_CONTENT) {
+      gActivityDistributor.addObserver(this);
+      Services.obs.addObserver(
+        this.#httpResponseExaminer,
+        "http-on-examine-response"
+      );
+      Services.obs.addObserver(
+        this.#httpResponseExaminer,
+        "http-on-examine-cached-response"
+      );
+      Services.obs.addObserver(
+        this.#httpModifyExaminer,
+        "http-on-modify-request"
+      );
+      Services.obs.addObserver(this.#httpStopRequest, "http-on-stop-request");
+    } else {
+      Services.obs.addObserver(
+        this.#httpFailedOpening,
+        "http-on-failed-opening-request"
+      );
+    }
+    // In child processes, only watch for service worker requests
+    // everything else only happens in the parent process
+    Services.obs.addObserver(
+      this.#serviceWorkerRequest,
+      "service-worker-synthesized-response"
+    );
+  }
+
+  setSaveRequestAndResponseBodies(save) {
+    this.#saveRequestAndResponseBodies = save;
+  }
+
+  getThrottleData() {
+    return this.#throttleData;
+  }
+
+  setThrottleData(value) {
+    this.#throttleData = value;
+    // Clear out any existing throttlers
+    this.#throttler = null;
+  }
+
+  #getThrottler() {
+    if (this.#throttleData !== null && this.#throttler === null) {
+      this.#throttler = new lazy.NetworkThrottleManager(this.#throttleData);
+    }
+    return this.#throttler;
+  }
+
+  #serviceWorkerRequest = DevToolsInfaillibleUtils.makeInfallible(
+    (subject, topic, data) => {
+      const channel = subject.QueryInterface(Ci.nsIHttpChannel);
+
+      if (this.#ignoreChannelFunction(channel)) {
+        return;
+      }
+
+      logPlatformEvent(topic, channel);
+
+      this.#interceptedChannels.add(subject);
+
+      // Service workers never fire http-on-examine-cached-response, so fake one.
+      this.#httpResponseExaminer(channel, "http-on-examine-cached-response");
+    }
+  );
+
+  /**
+   * Observes for http-on-failed-opening-request notification to catch any
+   * channels for which asyncOpen has synchronously failed.  This is the only
+   * place to catch early security check failures.
+   */
+  #httpFailedOpening = DevToolsInfaillibleUtils.makeInfallible(
+    (subject, topic) => {
+      if (
+        this.#isDestroyed ||
+        topic != "http-on-failed-opening-request" ||
+        !(subject instanceof Ci.nsIHttpChannel)
+      ) {
+        return;
+      }
+
+      const channel = subject.QueryInterface(Ci.nsIHttpChannel);
+      if (this.#ignoreChannelFunction(channel)) {
+        return;
+      }
+
+      logPlatformEvent(topic, channel);
+
+      // Ignore preload requests to avoid duplicity request entries in
+      // the Network panel. If a preload fails (for whatever reason)
+      // then the platform kicks off another 'real' request.
+      if (lazy.NetworkUtils.isPreloadRequest(channel)) {
+        return;
+      }
+
+      this.#httpResponseExaminer(subject, topic);
+    }
+  );
+
+  #httpStopRequest = DevToolsInfaillibleUtils.makeInfallible(
+    (subject, topic) => {
+      if (
+        this.#isDestroyed ||
+        topic != "http-on-stop-request" ||
+        !(subject instanceof Ci.nsIHttpChannel)
+      ) {
+        return;
+      }
+
+      const channel = subject.QueryInterface(Ci.nsIHttpChannel);
+      if (this.#ignoreChannelFunction(channel)) {
+        return;
+      }
+
+      logPlatformEvent(topic, channel);
+
+      const httpActivity = this.#createOrGetActivityObject(channel);
+      const serverTimings = this.#extractServerTimings(channel);
+
+      if (httpActivity.owner) {
+        // Try extracting server timings. Note that they will be sent to the client
+        // in the `_onTransactionClose` method together with network event timings.
+        httpActivity.owner.addServerTimings(serverTimings);
+
+        // If the owner isn't set we need to create the network event and send
+        // it to the client. This happens in case where:
+        // - the request has been blocked (e.g. CORS) and "http-on-stop-request" is the first notification.
+        // - the NetworkObserver is start *after* the request started and we only receive the http-stop notification,
+        //   but that doesn't mean the request is blocked, so check for its status.
+      } else if (Components.isSuccessCode(channel.status)) {
+        // Do not pass any blocked reason, as this request is just fine.
+        // Bug 1489217 - Prevent watching for this request response content,
+        // as this request is already running, this is too late to watch for it.
+        this.#createNetworkEvent(subject, { inProgressRequest: true });
+      } else {
+        // Handles any early blockings e.g by Web Extensions or by CORS
+        const { blockingExtension, blockedReason } =
+          lazy.NetworkUtils.getBlockedReason(channel);
+        this.#createNetworkEvent(subject, { blockedReason, blockingExtension });
+      }
+    }
+  );
+
+  /**
+   * Check if the current channel has its content being overriden
+   * by the content of some local file.
+   */
+  #checkForContentOverride(channel) {
+    const overridePath = this.#overrides.get(channel.URI.spec);
+    if (!overridePath) {
+      return false;
+    }
+
+    dump(" Override " + channel.URI.spec + " to " + overridePath + "\n");
+    try {
+      lazy.NetworkOverride.overrideChannelWithFilePath(channel, overridePath);
+    } catch (e) {
+      dump("Exception while trying to override request content: " + e + "\n");
+    }
+
+    return true;
+  }
+
+  /**
+   * Observe notifications for the http-on-examine-response topic, coming from
+   * the nsIObserverService.
+   *
+   * @private
+   * @param nsIHttpChannel subject
+   * @param string topic
+   * @returns void
+   */
+  #httpResponseExaminer = DevToolsInfaillibleUtils.makeInfallible(
+    (subject, topic) => {
+      // The httpResponseExaminer is used to retrieve the uncached response
+      // headers.
+      if (
+        this.#isDestroyed ||
+        (topic != "http-on-examine-response" &&
+          topic != "http-on-examine-cached-response" &&
+          topic != "http-on-failed-opening-request") ||
+        !(subject instanceof Ci.nsIHttpChannel) ||
+        !(subject instanceof Ci.nsIClassifiedChannel)
+      ) {
+        return;
+      }
+
+      const blockedOrFailed = topic === "http-on-failed-opening-request";
+
+      subject.QueryInterface(Ci.nsIClassifiedChannel);
+      const channel = subject.QueryInterface(Ci.nsIHttpChannel);
+
+      if (this.#ignoreChannelFunction(channel)) {
+        return;
+      }
+
+      logPlatformEvent(
+        topic,
+        subject,
+        blockedOrFailed
+          ? "blockedOrFailed:" + channel.loadInfo.requestBlockingReason
+          : channel.responseStatus
+      );
+
+      this.#checkForContentOverride(channel);
+
+      channel.QueryInterface(Ci.nsIHttpChannelInternal);
+
+      let httpActivity = this.#createOrGetActivityObject(channel);
+      if (topic === "http-on-examine-cached-response") {
+        // Service worker requests emits cached-response notification on non-e10s,
+        // and we fake one on e10s.
+        const fromServiceWorker = this.#interceptedChannels.has(channel);
+        this.#interceptedChannels.delete(channel);
+
+        // If this is a cached response (which are also emitted by service worker requests),
+        // there never was a request event so we need to construct one here
+        // so the frontend gets all the expected events.
+        if (!httpActivity.owner) {
+          httpActivity = this.#createNetworkEvent(channel, {
+            fromCache: !fromServiceWorker,
+            fromServiceWorker,
+          });
+        }
+
+        // We need to send the request body to the frontend for
+        // the faked (cached/service worker request) event.
+        this.#prepareRequestBody(httpActivity);
+        this.#sendRequestBody(httpActivity);
+
+        // There also is never any timing events, so we can fire this
+        // event with zeroed out values.
+        const timings = this.#setupHarTimings(httpActivity);
+
+        const serverTimings = this.#extractServerTimings(httpActivity.channel);
+        httpActivity.owner.addEventTimings(
+          timings.total,
+          timings.timings,
+          timings.offsets,
+          serverTimings
+        );
+      } else if (topic === "http-on-failed-opening-request") {
+        const { blockedReason } = lazy.NetworkUtils.getBlockedReason(channel);
+        this.#createNetworkEvent(channel, { blockedReason });
+      }
+
+      if (httpActivity.owner) {
+        httpActivity.owner.addResponseStart({
+          channel: httpActivity.channel,
+          fromCache: httpActivity.fromCache || httpActivity.fromServiceWorker,
+          rawHeaders: httpActivity.responseRawHeaders,
+        });
+      }
+    }
+  );
+
+  /**
+   * Observe notifications for the http-on-modify-request topic, coming from
+   * the nsIObserverService.
+   *
+   * @private
+   * @param nsIHttpChannel aSubject
+   * @returns void
+   */
+  #httpModifyExaminer = DevToolsInfaillibleUtils.makeInfallible(subject => {
+    const throttler = this.#getThrottler();
+    if (throttler) {
+      const channel = subject.QueryInterface(Ci.nsIHttpChannel);
+      if (this.#ignoreChannelFunction(channel)) {
+        return;
+      }
+      logPlatformEvent("http-on-modify-request", channel);
+
+      // Read any request body here, before it is throttled.
+      const httpActivity = this.#createOrGetActivityObject(channel);
+      this.#prepareRequestBody(httpActivity);
+      throttler.manageUpload(channel);
+    }
+  });
+
+  /**
+   * A helper function for observeActivity.  This does whatever work
+   * is required by a particular http activity event.  Arguments are
+   * the same as for observeActivity.
+   */
+  #dispatchActivity(
+    httpActivity,
+    channel,
+    activityType,
+    activitySubtype,
+    timestamp,
+    extraSizeData,
+    extraStringData
+  ) {
+    // Store the time information for this activity subtype.
+    if (activitySubtype in HTTP_TRANSACTION_CODES) {
+      const stage = HTTP_TRANSACTION_CODES[activitySubtype];
+      if (stage in httpActivity.timings) {
+        httpActivity.timings[stage].last = timestamp;
+      } else {
+        httpActivity.timings[stage] = {
+          first: timestamp,
+          last: timestamp,
+        };
+      }
+    }
+
+    switch (activitySubtype) {
+      case gActivityDistributor.ACTIVITY_SUBTYPE_REQUEST_BODY_SENT:
+        this.#prepareRequestBody(httpActivity);
+        this.#sendRequestBody(httpActivity);
+        break;
+      case gActivityDistributor.ACTIVITY_SUBTYPE_RESPONSE_HEADER:
+        httpActivity.responseRawHeaders = extraStringData;
+        httpActivity.headersSize = extraStringData.length;
+        break;
+      case gActivityDistributor.ACTIVITY_SUBTYPE_TRANSACTION_CLOSE:
+        this.#onTransactionClose(httpActivity);
+        break;
+      default:
+        break;
+    }
+  }
+
+  getActivityTypeString(activityType, activitySubtype) {
+    if (
+      activityType === Ci.nsIHttpActivityObserver.ACTIVITY_TYPE_SOCKET_TRANSPORT
+    ) {
+      for (const name in Ci.nsISocketTransport) {
+        if (Ci.nsISocketTransport[name] === activitySubtype) {
+          return "SOCKET_TRANSPORT:" + name;
+        }
+      }
+    } else if (
+      activityType === Ci.nsIHttpActivityObserver.ACTIVITY_TYPE_HTTP_TRANSACTION
+    ) {
+      for (const name in Ci.nsIHttpActivityObserver) {
+        if (Ci.nsIHttpActivityObserver[name] === activitySubtype) {
+          return "HTTP_TRANSACTION:" + name.replace("ACTIVITY_SUBTYPE_", "");
+        }
+      }
+    }
+    return "unexpected-activity-types:" + activityType + ":" + activitySubtype;
+  }
+
+  /**
+   * Begin observing HTTP traffic that originates inside the current tab.
+   *
+   * @see https://developer.mozilla.org/en/XPCOM_Interface_Reference/nsIHttpActivityObserver
+   *
+   * @param nsIHttpChannel channel
+   * @param number activityType
+   * @param number activitySubtype
+   * @param number timestamp
+   * @param number extraSizeData
+   * @param string extraStringData
+   */
+  observeActivity = DevToolsInfaillibleUtils.makeInfallible(function (
+    channel,
+    activityType,
+    activitySubtype,
+    timestamp,
+    extraSizeData,
+    extraStringData
+  ) {
+    if (
+      this.#isDestroyed ||
+      (activityType != gActivityDistributor.ACTIVITY_TYPE_HTTP_TRANSACTION &&
+        activityType != gActivityDistributor.ACTIVITY_TYPE_SOCKET_TRANSPORT)
+    ) {
+      return;
+    }
+
+    if (
+      !(channel instanceof Ci.nsIHttpChannel) ||
+      !(channel instanceof Ci.nsIClassifiedChannel)
+    ) {
+      return;
+    }
+
+    channel = channel.QueryInterface(Ci.nsIHttpChannel);
+    channel = channel.QueryInterface(Ci.nsIClassifiedChannel);
+
+    if (DEBUG_PLATFORM_EVENTS) {
+      logPlatformEvent(
+        this.getActivityTypeString(activityType, activitySubtype),
+        channel
+      );
+    }
+
+    if (
+      activitySubtype == gActivityDistributor.ACTIVITY_SUBTYPE_REQUEST_HEADER
+    ) {
+      this.#onRequestHeader(channel, timestamp, extraStringData);
+      return;
+    }
+
+    // Iterate over all currently ongoing requests. If channel can't
+    // be found within them, then exit this function.
+    const httpActivity = this.#findActivityObject(channel);
+    if (!httpActivity) {
+      return;
+    }
+
+    // If we're throttling, we must not report events as they arrive
+    // from platform, but instead let the throttler emit the events
+    // after some time has elapsed.
+    if (
+      httpActivity.downloadThrottle &&
+      HTTP_DOWNLOAD_ACTIVITIES.includes(activitySubtype)
+    ) {
+      const callback = this.#dispatchActivity.bind(this);
+      httpActivity.downloadThrottle.addActivityCallback(
+        callback,
+        httpActivity,
+        channel,
+        activityType,
+        activitySubtype,
+        timestamp,
+        extraSizeData,
+        extraStringData
+      );
+    } else {
+      this.#dispatchActivity(
+        httpActivity,
+        channel,
+        activityType,
+        activitySubtype,
+        timestamp,
+        extraSizeData,
+        extraStringData
+      );
+    }
+  });
+
+  /**
+   * Craft the "event" object passed to the Watcher class in order
+   * to instantiate the NetworkEventActor.
+   *
+   * /!\ This method does many other important things:
+   * - Cancel requests blocked by DevTools
+   * - Fetch request headers/cookies
+   * - Set a few attributes on http activity object
+   * - Register listener to record response content
+   */
+  #createNetworkEvent(
+    channel,
+    {
+      timestamp,
+      rawHeaders,
+      fromCache,
+      fromServiceWorker,
+      blockedReason,
+      blockingExtension,
+      inProgressRequest,
+    }
+  ) {
+    const httpActivity = this.#createOrGetActivityObject(channel);
+
+    if (timestamp) {
+      httpActivity.timings.REQUEST_HEADER = {
+        first: timestamp,
+        last: timestamp,
+      };
+    }
+
+    if (blockedReason === undefined && this.#shouldBlockChannel(channel)) {
+      // Check the request URL with ones manually blocked by the user in DevTools.
+      // If it's meant to be blocked, we cancel the request and annotate the event.
+      channel.cancel(Cr.NS_BINDING_ABORTED);
+      blockedReason = "devtools";
+    }
+
+    httpActivity.owner = this.#onNetworkEvent(
+      {
+        timestamp,
+        fromCache,
+        fromServiceWorker,
+        rawHeaders,
+        blockedReason,
+        blockingExtension,
+        discardRequestBody: !this.#saveRequestAndResponseBodies,
+        discardResponseBody: !this.#saveRequestAndResponseBodies,
+      },
+      channel
+    );
+    httpActivity.fromCache = fromCache || fromServiceWorker;
+
+    // Bug 1489217 - Avoid watching for response content for blocked or in-progress requests
+    // as it can't be observed and would throw if we try.
+    if (blockedReason === undefined && !inProgressRequest) {
+      this.#setupResponseListener(httpActivity, {
+        fromCache,
+        fromServiceWorker,
+      });
+    }
+
+    return httpActivity;
+  }
+
+  /**
+   * Handler for ACTIVITY_SUBTYPE_REQUEST_HEADER. When a request starts the
+   * headers are sent to the server. This method creates the |httpActivity|
+   * object where we store the request and response information that is
+   * collected through its lifetime.
+   *
+   * @private
+   * @param nsIHttpChannel channel
+   * @param number timestamp
+   * @param string rawHeaders
+   * @return void
+   */
+  #onRequestHeader(channel, timestamp, rawHeaders) {
+    if (this.#ignoreChannelFunction(channel)) {
+      return;
+    }
+
+    this.#createNetworkEvent(channel, {
+      timestamp,
+      rawHeaders,
+    });
+  }
+
+  /**
+   * Check if the provided channel should be blocked given the current
+   * blocked URLs configured for this network observer.
+   */
+  #shouldBlockChannel(channel) {
+    for (const regexp of this.#blockedURLs.values()) {
+      if (regexp.test(channel.URI.spec)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  /**
+   * Find an HTTP activity object for the channel.
+   *
+   * @param nsIHttpChannel channel
+   *        The HTTP channel whose activity object we want to find.
+   * @return object
+   *        The HTTP activity object, or null if it is not found.
+   */
+  #findActivityObject(channel) {
+    return this.#openRequests.get(channel);
+  }
+
+  /**
+   * Find an existing HTTP activity object, or create a new one. This
+   * object is used for storing all the request and response
+   * information.
+   *
+   * This is a HAR-like object. Conformance to the spec is not guaranteed at
+   * this point.
+   *
+   * @see http://www.softwareishard.com/blog/har-12-spec
+   * @param nsIHttpChannel channel
+   *        The HTTP channel for which the HTTP activity object is created.
+   * @return object
+   *         The new HTTP activity object.
+   */
+  #createOrGetActivityObject(channel) {
+    let httpActivity = this.#findActivityObject(channel);
+    if (!httpActivity) {
+      const win = lazy.NetworkHelper.getWindowForRequest(channel);
+      const charset = win ? win.document.characterSet : null;
+
+      // Most of the data needed from the channel is only available via the
+      // nsIHttpChannelInternal interface.
+      channel.QueryInterface(Ci.nsIHttpChannelInternal);
+
+      httpActivity = {
+        // The nsIChannel for which this activity object was created.
+        channel,
+        // See #prepareRequestBody()
+        charset,
+        // The postData sent by this request.
+        sentBody: null,
+        // The URL for the current channel.
+        url: channel.URI.spec,
+        // The encoded response body size.
+        bodySize: 0,
+        // The response headers size.
+        headersSize: 0,
+        // needed for host specific security info
+        hostname: channel.URI.host,
+        discardRequestBody: !this.#saveRequestAndResponseBodies,
+        discardResponseBody: !this.#saveRequestAndResponseBodies,
+        // internal timing information, see observeActivity()
+        timings: {},
+        // the activity owner which is notified when changes happen
+        owner: null,
+      };
+
+      this.#openRequests.set(channel, httpActivity);
+    }
+
+    return httpActivity;
+  }
+
+  /**
+   * Block a request based on certain filtering options.
+   *
+   * Currently, exact URL match or URL patterns are supported.
+   */
+  blockRequest(filter) {
+    if (!filter || !filter.url) {
+      // In the future, there may be other types of filters, such as domain.
+      // For now, ignore anything other than URL.
+      return;
+    }
+
+    this.#addBlockedUrl(filter.url);
+  }
+
+  /**
+   * Unblock a request based on certain filtering options.
+   *
+   * Currently, exact URL match or URL patterns are supported.
+   */
+  unblockRequest(filter) {
+    if (!filter || !filter.url) {
+      // In the future, there may be other types of filters, such as domain.
+      // For now, ignore anything other than URL.
+      return;
+    }
+
+    this.#blockedURLs.delete(filter.url);
+  }
+
+  /**
+   * Updates the list of blocked request strings
+   *
+   * This match will be a (String).includes match, not an exact URL match
+   */
+  setBlockedUrls(urls) {
+    urls = urls || [];
+    this.#blockedURLs = new Map();
+    urls.forEach(url => this.#addBlockedUrl(url));
+  }
+
+  #addBlockedUrl(url) {
+    this.#blockedURLs.set(url, lazy.wildcardToRegExp(url));
+  }
+
+  /**
+   * Returns a list of blocked requests
+   * Useful as blockedURLs is mutated by both console & netmonitor
+   */
+  getBlockedUrls() {
+    return this.#blockedURLs.keys();
+  }
+
+  override(url, path) {
+    this.#overrides.set(url, path);
+  }
+
+  removeOverride(url) {
+    this.#overrides.delete(url);
+  }
+
+  /**
+   * Setup the network response listener for the given HTTP activity. The
+   * NetworkResponseListener is responsible for storing the response body.
+   *
+   * @private
+   * @param object httpActivity
+   *        The HTTP activity object we are tracking.
+   */
+  #setupResponseListener(httpActivity, { fromCache, fromServiceWorker }) {
+    const channel = httpActivity.channel;
+    channel.QueryInterface(Ci.nsITraceableChannel);
+
+    if (!fromCache) {
+      const throttler = this.#getThrottler();
+      if (throttler) {
+        httpActivity.downloadThrottle = throttler.manage(channel);
+      }
+    }
+
+    // The response will be written into the outputStream of this pipe.
+    // This allows us to buffer the data we are receiving and read it
+    // asynchronously.
+    // Both ends of the pipe must be blocking.
+    const sink = Cc["@mozilla.org/pipe;1"].createInstance(Ci.nsIPipe);
+
+    // The streams need to be blocking because this is required by the
+    // stream tee.
+    sink.init(false, false, this.#responsePipeSegmentSize, PR_UINT32_MAX, null);
+
+    // Add listener for the response body.
+    const newListener = new lazy.NetworkResponseListener(
+      httpActivity,
+      this.#decodedCertificateCache,
+      fromServiceWorker
+    );
+
+    // Remember the input stream, so it isn't released by GC.
+    newListener.inputStream = sink.inputStream;
+    newListener.sink = sink;
+
+    const tee = Cc["@mozilla.org/network/stream-listener-tee;1"].createInstance(
+      Ci.nsIStreamListenerTee
+    );
+
+    const originalListener = channel.setNewListener(tee);
+
+    tee.init(originalListener, sink.outputStream, newListener);
+  }
+
+  /**
+   * Handler for ACTIVITY_SUBTYPE_REQUEST_BODY_SENT. Read and record the request
+   * body here. It will be available in addResponseStart.
+   *
+   * @private
+   * @param object httpActivity
+   *        The HTTP activity object we are working with.
+   */
+  #prepareRequestBody(httpActivity) {
+    // Return early if we don't need the request body, or if we've
+    // already found it.
+    if (httpActivity.discardRequestBody || httpActivity.sentBody !== null) {
+      return;
+    }
+
+    let sentBody = lazy.NetworkHelper.readPostTextFromRequest(
+      httpActivity.channel,
+      httpActivity.charset
+    );
+
+    if (
+      sentBody !== null &&
+      this.window &&
+      httpActivity.url == this.window.location.href
+    ) {
+      // If the request URL is the same as the current page URL, then
+      // we can try to get the posted text from the page directly.
+      // This check is necessary as otherwise the
+      //   lazy.NetworkHelper.readPostTextFromPageViaWebNav()
+      // function is called for image requests as well but these
+      // are not web pages and as such don't store the posted text
+      // in the cache of the webpage.
+      const webNav = this.window.docShell.QueryInterface(Ci.nsIWebNavigation);
+      sentBody = lazy.NetworkHelper.readPostTextFromPageViaWebNav(
+        webNav,
+        httpActivity.charset
+      );
+    }
+
+    if (sentBody !== null) {
+      httpActivity.sentBody = sentBody;
+    }
+  }
+
+  /**
+   * Handler for ACTIVITY_SUBTYPE_TRANSACTION_CLOSE. This method updates the HAR
+   * timing information on the HTTP activity object and clears the request
+   * from the list of known open requests.
+   *
+   * @private
+   * @param object httpActivity
+   *        The HTTP activity object we work with.
+   */
+  #onTransactionClose(httpActivity) {
+    if (httpActivity.owner) {
+      const result = this.#setupHarTimings(httpActivity);
+      const serverTimings = this.#extractServerTimings(httpActivity.channel);
+
+      httpActivity.owner.addEventTimings(
+        result.total,
+        result.timings,
+        result.offsets,
+        serverTimings
+      );
+    }
+  }
+
+  #getBlockedTiming(timings) {
+    if (timings.STATUS_RESOLVING && timings.STATUS_CONNECTING_TO) {
+      return timings.STATUS_RESOLVING.first - timings.REQUEST_HEADER.first;
+    } else if (timings.STATUS_SENDING_TO) {
+      return timings.STATUS_SENDING_TO.first - timings.REQUEST_HEADER.first;
+    }
+
+    return -1;
+  }
+
+  #getDnsTiming(timings) {
+    if (timings.STATUS_RESOLVING && timings.STATUS_RESOLVED) {
+      return timings.STATUS_RESOLVED.last - timings.STATUS_RESOLVING.first;
+    }
+
+    return -1;
+  }
+
+  #getConnectTiming(timings) {
+    if (timings.STATUS_CONNECTING_TO && timings.STATUS_CONNECTED_TO) {
+      return (
+        timings.STATUS_CONNECTED_TO.last - timings.STATUS_CONNECTING_TO.first
+      );
+    }
+
+    return -1;
+  }
+
+  #getReceiveTiming(timings) {
+    if (timings.RESPONSE_START && timings.RESPONSE_COMPLETE) {
+      return timings.RESPONSE_COMPLETE.last - timings.RESPONSE_START.first;
+    }
+
+    return -1;
+  }
+
+  #getWaitTiming(timings) {
+    if (timings.RESPONSE_START) {
+      return (
+        timings.RESPONSE_START.first -
+        (timings.REQUEST_BODY_SENT || timings.STATUS_SENDING_TO).last
+      );
+    }
+
+    return -1;
+  }
+
+  #getSslTiming(timings) {
+    if (timings.STATUS_TLS_STARTING && timings.STATUS_TLS_ENDING) {
+      return timings.STATUS_TLS_ENDING.last - timings.STATUS_TLS_STARTING.first;
+    }
+
+    return -1;
+  }
+
+  #getSendTiming(timings) {
+    if (timings.STATUS_SENDING_TO) {
+      return timings.STATUS_SENDING_TO.last - timings.STATUS_SENDING_TO.first;
+    } else if (timings.REQUEST_HEADER && timings.REQUEST_BODY_SENT) {
+      return timings.REQUEST_BODY_SENT.last - timings.REQUEST_HEADER.first;
+    }
+
+    return -1;
+  }
+
+  #getDataFromTimedChannel(timedChannel) {
+    const lookUpArr = [
+      "tcpConnectEndTime",
+      "connectStartTime",
+      "connectEndTime",
+      "secureConnectionStartTime",
+      "domainLookupEndTime",
+      "domainLookupStartTime",
+    ];
+
+    return lookUpArr.reduce((prev, prop) => {
+      const propName = prop + "Tc";
+      return {
+        ...prev,
+        [propName]: (() => {
+          if (!timedChannel) {
+            return 0;
+          }
+
+          const value = timedChannel[prop];
+
+          if (
+            value != 0 &&
+            timedChannel.asyncOpenTime &&
+            value < timedChannel.asyncOpenTime
+          ) {
+            return 0;
+          }
+
+          return value;
+        })(),
+      };
+    }, {});
+  }
+
+  #getSecureConnectionStartTimeInfo(timings) {
+    let secureConnectionStartTime = 0;
+    let secureConnectionStartTimeRelative = false;
+
+    if (timings.STATUS_TLS_STARTING && timings.STATUS_TLS_ENDING) {
+      if (timings.STATUS_CONNECTING_TO) {
+        secureConnectionStartTime =
+          timings.STATUS_TLS_STARTING.first -
+          timings.STATUS_CONNECTING_TO.first;
+      }
+
+      if (secureConnectionStartTime < 0) {
+        secureConnectionStartTime = 0;
+      }
+      secureConnectionStartTimeRelative = true;
+    }
+
+    return {
+      secureConnectionStartTime,
+      secureConnectionStartTimeRelative,
+    };
+  }
+
+  #getStartSendingTimeInfo(timings, connectStartTimeTc) {
+    let startSendingTime = 0;
+    let startSendingTimeRelative = false;
+
+    if (timings.STATUS_SENDING_TO) {
+      if (timings.STATUS_CONNECTING_TO) {
+        startSendingTime =
+          timings.STATUS_SENDING_TO.first - timings.STATUS_CONNECTING_TO.first;
+        startSendingTimeRelative = true;
+      } else if (connectStartTimeTc != 0) {
+        startSendingTime = timings.STATUS_SENDING_TO.first - connectStartTimeTc;
+        startSendingTimeRelative = true;
+      }
+
+      if (startSendingTime < 0) {
+        startSendingTime = 0;
+      }
+    }
+    return { startSendingTime, startSendingTimeRelative };
+  }
+
+  /**
+   * Update the HTTP activity object to include timing information as in the HAR
+   * spec. The HTTP activity object holds the raw timing information in
+   * |timings| - these are timings stored for each activity notification. The
+   * HAR timing information is constructed based on these lower level
+   * data.
+   *
+   * @param {Object} httpActivity
+   *     The HTTP activity object we are working with.
+   * @return {Object}
+   *     This object holds three properties:
+   *     - {Object} offsets: the timings computed as offsets from the initial
+   *     request start time.
+   *     - {Object} timings: the HAR timings object
+   *     - {number} total: the total time for all of the request and response
+   */
+  #setupHarTimings(httpActivity) {
+    if (httpActivity.fromCache) {
+      // If it came from the browser cache, we have no timing
+      // information and these should all be 0
+      return {
+        total: 0,
+        timings: {
+          blocked: 0,
+          dns: 0,
+          ssl: 0,
+          connect: 0,
+          send: 0,
+          wait: 0,
+          receive: 0,
+        },
+        offsets: {
+          blocked: 0,
+          dns: 0,
+          ssl: 0,
+          connect: 0,
+          send: 0,
+          wait: 0,
+          receive: 0,
+        },
+      };
+    }
+
+    const timings = httpActivity.timings;
+    const harTimings = {};
+    // If the TCP Fast Open option or tls1.3 0RTT is used tls and data can
+    // be dispatched in SYN packet and not after tcp socket is connected.
+    // To demostrate this properly we will calculated TLS and send start time
+    // relative to CONNECTING_TO.
+    // Similary if 0RTT is used, data can be sent as soon as a TLS handshake
+    // starts.
+
+    harTimings.blocked = this.#getBlockedTiming(timings);
+    // DNS timing information is available only in when the DNS record is not
+    // cached.
+    harTimings.dns = this.#getDnsTiming(timings);
+    harTimings.connect = this.#getConnectTiming(timings);
+    harTimings.ssl = this.#getSslTiming(timings);
+
+    let { secureConnectionStartTime, secureConnectionStartTimeRelative } =
+      this.#getSecureConnectionStartTimeInfo(timings);
+
+    // sometimes the connection information events are attached to a speculative
+    // channel instead of this one, but necko might glue them back together in the
+    // nsITimedChannel interface used by Resource and Navigation Timing
+    const timedChannel = httpActivity.channel.QueryInterface(
+      Ci.nsITimedChannel
+    );
+
+    const {
+      tcpConnectEndTimeTc,
+      connectStartTimeTc,
+      connectEndTimeTc,
+      secureConnectionStartTimeTc,
+      domainLookupEndTimeTc,
+      domainLookupStartTimeTc,
+    } = this.#getDataFromTimedChannel(timedChannel);
+
+    if (
+      harTimings.connect <= 0 &&
+      timedChannel &&
+      tcpConnectEndTimeTc != 0 &&
+      connectStartTimeTc != 0
+    ) {
+      harTimings.connect = tcpConnectEndTimeTc - connectStartTimeTc;
+      if (secureConnectionStartTimeTc != 0) {
+        harTimings.ssl = connectEndTimeTc - secureConnectionStartTimeTc;
+        secureConnectionStartTime =
+          secureConnectionStartTimeTc - connectStartTimeTc;
+        secureConnectionStartTimeRelative = true;
+      } else {
+        harTimings.ssl = -1;
+      }
+    } else if (
+      timedChannel &&
+      timings.STATUS_TLS_STARTING &&
+      secureConnectionStartTimeTc != 0
+    ) {
+      // It can happen that TCP Fast Open actually have not sent any data and
+      // timings.STATUS_TLS_STARTING.first value will be corrected in
+      // timedChannel.secureConnectionStartTime
+      if (secureConnectionStartTimeTc > timings.STATUS_TLS_STARTING.first) {
+        // TCP Fast Open actually did not sent any data.
+        harTimings.ssl = connectEndTimeTc - secureConnectionStartTimeTc;
+        secureConnectionStartTimeRelative = false;
+      }
+    }
+
+    if (
+      harTimings.dns <= 0 &&
+      timedChannel &&
+      domainLookupEndTimeTc != 0 &&
+      domainLookupStartTimeTc != 0
+    ) {
+      harTimings.dns = domainLookupEndTimeTc - domainLookupStartTimeTc;
+    }
+
+    harTimings.send = this.#getSendTiming(timings);
+    harTimings.wait = this.#getWaitTiming(timings);
+    harTimings.receive = this.#getReceiveTiming(timings);
+    let { startSendingTime, startSendingTimeRelative } =
+      this.#getStartSendingTimeInfo(timings, connectStartTimeTc);
+
+    if (secureConnectionStartTimeRelative) {
+      const time = Math.max(Math.round(secureConnectionStartTime / 1000), -1);
+      secureConnectionStartTime = time;
+    }
+    if (startSendingTimeRelative) {
+      const time = Math.max(Math.round(startSendingTime / 1000), -1);
+      startSendingTime = time;
+    }
+
+    const ot = this.#calculateOffsetAndTotalTime(
+      harTimings,
+      secureConnectionStartTime,
+      startSendingTimeRelative,
+      secureConnectionStartTimeRelative,
+      startSendingTime
+    );
+    return {
+      total: ot.total,
+      timings: harTimings,
+      offsets: ot.offsets,
+    };
+  }
+
+  #extractServerTimings(channel) {
+    if (!channel || !channel.serverTiming) {
+      return null;
+    }
+
+    const serverTimings = new Array(channel.serverTiming.length);
+
+    for (let i = 0; i < channel.serverTiming.length; ++i) {
+      const { name, duration, description } =
+        channel.serverTiming.queryElementAt(i, Ci.nsIServerTiming);
+      serverTimings[i] = { name, duration, description };
+    }
+
+    return serverTimings;
+  }
+
+  #convertTimeToMs(timing) {
+    return Math.max(Math.round(timing / 1000), -1);
+  }
+
+  #calculateOffsetAndTotalTime(
+    harTimings,
+    secureConnectionStartTime,
+    startSendingTimeRelative,
+    secureConnectionStartTimeRelative,
+    startSendingTime
+  ) {
+    let totalTime = 0;
+    for (const timing in harTimings) {
+      const time = this.#convertTimeToMs(harTimings[timing]);
+      harTimings[timing] = time;
+      if (time > -1 && timing != "connect" && timing != "ssl") {
+        totalTime += time;
+      }
+    }
+
+    // connect, ssl and send times can be overlapped.
+    if (startSendingTimeRelative) {
+      totalTime += startSendingTime;
+    } else if (secureConnectionStartTimeRelative) {
+      totalTime += secureConnectionStartTime;
+      totalTime += harTimings.ssl;
+    }
+
+    const offsets = {};
+    offsets.blocked = 0;
+    offsets.dns = harTimings.blocked;
+    offsets.connect = offsets.dns + harTimings.dns;
+    if (secureConnectionStartTimeRelative) {
+      offsets.ssl = offsets.connect + secureConnectionStartTime;
+    } else {
+      offsets.ssl = offsets.connect + harTimings.connect;
+    }
+    if (startSendingTimeRelative) {
+      offsets.send = offsets.connect + startSendingTime;
+      if (!secureConnectionStartTimeRelative) {
+        offsets.ssl = offsets.send - harTimings.ssl;
+      }
+    } else {
+      offsets.send = offsets.ssl + harTimings.ssl;
+    }
+    offsets.wait = offsets.send + harTimings.send;
+    offsets.receive = offsets.wait + harTimings.wait;
+
+    return {
+      total: totalTime,
+      offsets,
+    };
+  }
+
+  #sendRequestBody(httpActivity) {
+    if (httpActivity.sentBody !== null) {
+      const limit = Services.prefs.getIntPref(
+        "devtools.netmonitor.requestBodyLimit"
+      );
+      const size = httpActivity.sentBody.length;
+      if (size > limit && limit > 0) {
+        httpActivity.sentBody = httpActivity.sentBody.substr(0, limit);
+      }
+      httpActivity.owner.addRequestPostData({
+        text: httpActivity.sentBody,
+        size,
+      });
+      httpActivity.sentBody = null;
+    }
+  }
+
+  /*
+   * Clears the open requests channel map.
+   */
+  clear() {
+    this.#openRequests.clear();
+  }
+
+  /**
+   * Suspend observer activity. This is called when the Network monitor actor stops
+   * listening.
+   */
+  destroy() {
+    if (Services.appinfo.processType != Ci.nsIXULRuntime.PROCESS_TYPE_CONTENT) {
+      gActivityDistributor.removeObserver(this);
+      Services.obs.removeObserver(
+        this.#httpResponseExaminer,
+        "http-on-examine-response"
+      );
+      Services.obs.removeObserver(
+        this.#httpResponseExaminer,
+        "http-on-examine-cached-response"
+      );
+      Services.obs.removeObserver(
+        this.#httpModifyExaminer,
+        "http-on-modify-request"
+      );
+      Services.obs.removeObserver(
+        this.#httpStopRequest,
+        "http-on-stop-request"
+      );
+    } else {
+      Services.obs.removeObserver(
+        this.#httpFailedOpening,
+        "http-on-failed-opening-request"
+      );
+    }
+
+    Services.obs.removeObserver(
+      this.#serviceWorkerRequest,
+      "service-worker-synthesized-response"
+    );
+
+    this.#ignoreChannelFunction = null;
+    this.#onNetworkEvent = null;
+    this.#throttler = null;
+    this.#decodedCertificateCache.clear();
+    this.clear();
+
+    this.#isDestroyed = true;
+  }
+}