Adding upstream version 115.7.0esr.upstream/115.7.0esr

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

1 files changed, 803 insertions, 0 deletions

diff --git a/toolkit/modules/GMPInstallManager.sys.mjs b/toolkit/modules/GMPInstallManager.sys.mjs
new file mode 100644
index 0000000000..9cb4802e58
--- /dev/null
+++ b/toolkit/modules/GMPInstallManager.sys.mjs
@@ -0,0 +1,803 @@
+/* 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/. */
+
+// 1 day default
+const DEFAULT_SECONDS_BETWEEN_CHECKS = 60 * 60 * 24;
+
+import { PromiseUtils } from "resource://gre/modules/PromiseUtils.sys.mjs";
+
+import { Log } from "resource://gre/modules/Log.sys.mjs";
+import {
+  GMPPrefs,
+  GMPUtils,
+  GMP_PLUGIN_IDS,
+  WIDEVINE_ID,
+} from "resource://gre/modules/GMPUtils.sys.mjs";
+
+import { ProductAddonChecker } from "resource://gre/modules/addons/ProductAddonChecker.sys.mjs";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  CertUtils: "resource://gre/modules/CertUtils.sys.mjs",
+  FileUtils: "resource://gre/modules/FileUtils.sys.mjs",
+  ServiceRequest: "resource://gre/modules/ServiceRequest.sys.mjs",
+  UpdateUtils: "resource://gre/modules/UpdateUtils.sys.mjs",
+});
+
+function getScopedLogger(prefix) {
+  // `PARENT_LOGGER_ID.` being passed here effectively links this logger
+  // to the parentLogger.
+  return Log.repository.getLoggerWithMessagePrefix("Toolkit.GMP", prefix + " ");
+}
+
+const LOCAL_GMP_SOURCES = [
+  {
+    id: "gmp-gmpopenh264",
+    src: "chrome://global/content/gmp-sources/openh264.json",
+  },
+  {
+    id: "gmp-widevinecdm",
+    src: "chrome://global/content/gmp-sources/widevinecdm.json",
+  },
+];
+
+function downloadJSON(uri) {
+  let log = getScopedLogger("GMPInstallManager.checkForAddons");
+  log.info("fetching config from: " + uri);
+  return new Promise((resolve, reject) => {
+    let xmlHttp = new lazy.ServiceRequest({ mozAnon: true });
+
+    xmlHttp.onload = function (aResponse) {
+      resolve(JSON.parse(this.responseText));
+    };
+
+    xmlHttp.onerror = function (e) {
+      reject("Fetching " + uri + " results in error code: " + e.target.status);
+    };
+
+    xmlHttp.open("GET", uri);
+    xmlHttp.overrideMimeType("application/json");
+    xmlHttp.send();
+  });
+}
+
+/**
+ * If downloading from the network fails (AUS server is down),
+ * load the sources from local build configuration.
+ */
+function downloadLocalConfig() {
+  let log = getScopedLogger("GMPInstallManager.downloadLocalConfig");
+  return Promise.all(
+    LOCAL_GMP_SOURCES.map(conf => {
+      return downloadJSON(conf.src).then(addons => {
+        let platforms = addons.vendors[conf.id].platforms;
+        let target = Services.appinfo.OS + "_" + lazy.UpdateUtils.ABI;
+        let details = null;
+
+        while (!details) {
+          if (!(target in platforms)) {
+            // There was no matching platform so return false, this addon
+            // will be filtered from the results below
+            log.info("no details found for: " + target);
+            return false;
+          }
+          // Field either has the details of the binary or is an alias
+          // to another build target key that does
+          if (platforms[target].alias) {
+            target = platforms[target].alias;
+          } else {
+            details = platforms[target];
+          }
+        }
+
+        log.info("found plugin: " + conf.id);
+        return {
+          id: conf.id,
+          URL: details.fileUrl,
+          hashFunction: addons.hashFunction,
+          hashValue: details.hashValue,
+          version: addons.vendors[conf.id].version,
+          size: details.filesize,
+        };
+      });
+    })
+  ).then(addons => {
+    // Some filters may not match this platform so
+    // filter those out
+    addons = addons.filter(x => x !== false);
+
+    return {
+      usedFallback: true,
+      addons,
+    };
+  });
+}
+
+/**
+ * Provides an easy API for downloading and installing GMP Addons
+ */
+export function GMPInstallManager() {}
+
+/**
+ * Temp file name used for downloading
+ */
+GMPInstallManager.prototype = {
+  /**
+   * Obtains a URL with replacement of vars
+   */
+  async _getURL() {
+    let log = getScopedLogger("GMPInstallManager._getURL");
+    // Use the override URL if it is specified.  The override URL is just like
+    // the normal URL but it does not check the cert.
+    let url = GMPPrefs.getString(GMPPrefs.KEY_URL_OVERRIDE, "");
+    if (url) {
+      log.info("Using override url: " + url);
+    } else {
+      url = GMPPrefs.getString(GMPPrefs.KEY_URL);
+      log.info("Using url: " + url);
+    }
+
+    url = await lazy.UpdateUtils.formatUpdateURL(url);
+
+    log.info("Using url (with replacement): " + url);
+    return url;
+  },
+
+  /**
+   * Records telemetry results on if fetching update.xml from Balrog succeeded
+   * when content signature was used to verify the response from Balrog.
+   * @param didGetAddonList
+   *        A boolean indicating if an update.xml containing the addon list was
+   *        successfully fetched (true) or not (false).
+   * @param err
+   *        The error that was thrown (if it exists) for the failure case. This
+   *        is expected to have a addonCheckerErr member which provides further
+   *        information on why the addon checker failed.
+   */
+  recordUpdateXmlTelemetryForContentSignature(didGetAddonList, err = null) {
+    let log = getScopedLogger(
+      "GMPInstallManager.recordUpdateXmlTelemetryForContentSignature"
+    );
+    try {
+      let updateResultHistogram = Services.telemetry.getHistogramById(
+        "MEDIA_GMP_UPDATE_XML_FETCH_RESULT"
+      );
+
+      // The non-glean telemetry used here will be removed in future and just
+      // the glean data will be gathered.
+      if (didGetAddonList) {
+        updateResultHistogram.add("content_sig_ok");
+        Glean.gmp.updateXmlFetchResult.content_sig_success.add(1);
+        return;
+      }
+      // All remaining cases are failure cases.
+      updateResultHistogram.add("content_sig_fail");
+      if (!err?.addonCheckerErr) {
+        // Unknown error case. If this is happening we should audit error paths
+        // to identify why we're not getting an error, or not getting it
+        // labelled.
+        Glean.gmp.updateXmlFetchResult.content_sig_unknown_error.add(1);
+        return;
+      }
+      const errorToHistogramMap = {
+        [ProductAddonChecker.NETWORK_REQUEST_ERR]:
+          "content_sig_net_request_error",
+        [ProductAddonChecker.NETWORK_TIMEOUT_ERR]: "content_sig_net_timeout",
+        [ProductAddonChecker.ABORT_ERR]: "content_sig_abort",
+        [ProductAddonChecker.VERIFICATION_MISSING_DATA_ERR]:
+          "content_sig_missing_data",
+        [ProductAddonChecker.VERIFICATION_FAILED_ERR]: "content_sig_failed",
+        [ProductAddonChecker.VERIFICATION_INVALID_ERR]: "content_sig_invalid",
+        [ProductAddonChecker.XML_PARSE_ERR]: "content_sig_xml_parse_error",
+      };
+      let metricID =
+        errorToHistogramMap[err.addonCheckerErr] ?? "content_sig_unknown_error";
+      let metric = Glean.gmp.updateXmlFetchResult[metricID];
+      metric.add(1);
+    } catch (e) {
+      // We don't expect this path to be hit, but we don't want telemetry
+      // failures to break GMP updates, so catch any issues here and let the
+      // update machinery continue.
+      log.error(
+        `Failed to record telemetry result of getProductAddonList, got error: ${e}`
+      );
+    }
+  },
+
+  /**
+   * Records telemetry results on if fetching update.xml from Balrog succeeded
+   * when cert pinning was used to verify the response from Balrog. This
+   * should be removed once we're no longer using cert pinning.
+   * @param didGetAddonList
+   *        A boolean indicating if an update.xml containing the addon list was
+   *        successfully fetched (true) or not (false).
+   * @param err
+   *        The error that was thrown (if it exists) for the failure case. This
+   *        is expected to have a addonCheckerErr member which provides further
+   *        information on why the addon checker failed.
+   */
+  recordUpdateXmlTelemetryForCertPinning(didGetAddonList, err = null) {
+    let log = getScopedLogger(
+      "GMPInstallManager.recordUpdateXmlTelemetryForCertPinning"
+    );
+    try {
+      let updateResultHistogram = Services.telemetry.getHistogramById(
+        "MEDIA_GMP_UPDATE_XML_FETCH_RESULT"
+      );
+
+      // The non-glean telemetry used here will be removed in future and just
+      // the glean data will be gathered.
+      if (didGetAddonList) {
+        updateResultHistogram.add("cert_pinning_ok");
+        Glean.gmp.updateXmlFetchResult.cert_pin_success.add(1);
+        return;
+      }
+      // All remaining cases are failure cases.
+      updateResultHistogram.add("cert_pinning_fail");
+      if (!err?.addonCheckerErr) {
+        // Unknown error case. If this is happening we should audit error paths
+        // to identify why we're not getting an error, or not getting it
+        // labelled.
+        Glean.gmp.updateXmlFetchResult.cert_pin_unknown_error.add(1);
+        return;
+      }
+      const errorToHistogramMap = {
+        [ProductAddonChecker.NETWORK_REQUEST_ERR]: "cert_pin_net_request_error",
+        [ProductAddonChecker.NETWORK_TIMEOUT_ERR]: "cert_pin_net_timeout",
+        [ProductAddonChecker.ABORT_ERR]: "cert_pin_abort",
+        [ProductAddonChecker.VERIFICATION_MISSING_DATA_ERR]:
+          "cert_pin_missing_data",
+        [ProductAddonChecker.VERIFICATION_FAILED_ERR]: "cert_pin_failed",
+        [ProductAddonChecker.VERIFICATION_INVALID_ERR]: "cert_pin_invalid",
+        [ProductAddonChecker.XML_PARSE_ERR]: "cert_pin_xml_parse_error",
+      };
+      let metricID =
+        errorToHistogramMap[err.addonCheckerErr] ?? "cert_pin_unknown_error";
+      let metric = Glean.gmp.updateXmlFetchResult[metricID];
+      metric.add(1);
+    } catch (e) {
+      // We don't expect this path to be hit, but we don't want telemetry
+      // failures to break GMP updates, so catch any issues here and let the
+      // update machinery continue.
+      log.error(
+        `Failed to record telemetry result of getProductAddonList, got error: ${e}`
+      );
+    }
+  },
+
+  /**
+   * Performs an addon check.
+   * @return a promise which will be resolved or rejected.
+   *         The promise is resolved with an object with properties:
+   *           addons: array of addons
+   *           usedFallback: whether the data was collected from online or
+   *                         from fallback data within the build
+   *         The promise is rejected with an object with properties:
+   *           target: The XHR request object
+   *           status: The HTTP status code
+   *           type: Sometimes specifies type of rejection
+   */
+  async checkForAddons() {
+    let log = getScopedLogger("GMPInstallManager.checkForAddons");
+    if (this._deferred) {
+      log.error("checkForAddons already called");
+      return Promise.reject({ type: "alreadycalled" });
+    }
+
+    if (!GMPPrefs.getBool(GMPPrefs.KEY_UPDATE_ENABLED, true)) {
+      log.info("Updates are disabled via media.gmp-manager.updateEnabled");
+      return { usedFallback: true, addons: [] };
+    }
+
+    this._deferred = PromiseUtils.defer();
+
+    // Should content signature checking of Balrog replies be used? If so this
+    // will be done instead of the older cert pinning method.
+    let checkContentSignature = GMPPrefs.getBool(
+      GMPPrefs.KEY_CHECK_CONTENT_SIGNATURE,
+      true
+    );
+
+    let allowNonBuiltIn = true;
+    let certs = null;
+    // Only check certificates if we're not using a custom URL, and only if
+    // we're not checking a content signature.
+    if (
+      !Services.prefs.prefHasUserValue(GMPPrefs.KEY_URL_OVERRIDE) &&
+      !checkContentSignature
+    ) {
+      allowNonBuiltIn = !GMPPrefs.getString(
+        GMPPrefs.KEY_CERT_REQUIREBUILTIN,
+        true
+      );
+      if (GMPPrefs.getBool(GMPPrefs.KEY_CERT_CHECKATTRS, true)) {
+        certs = lazy.CertUtils.readCertPrefs(GMPPrefs.KEY_CERTS_BRANCH);
+      }
+    }
+
+    let url = await this._getURL();
+
+    log.info(
+      `Fetching product addon list url=${url}, allowNonBuiltIn=${allowNonBuiltIn}, certs=${certs}, checkContentSignature=${checkContentSignature}`
+    );
+    let addonPromise = ProductAddonChecker.getProductAddonList(
+      url,
+      allowNonBuiltIn,
+      certs,
+      checkContentSignature
+    )
+      .then(res => {
+        if (checkContentSignature) {
+          this.recordUpdateXmlTelemetryForContentSignature(true);
+        } else {
+          this.recordUpdateXmlTelemetryForCertPinning(true);
+        }
+        return res;
+      })
+      .catch(err => {
+        if (checkContentSignature) {
+          this.recordUpdateXmlTelemetryForContentSignature(false, err);
+        } else {
+          this.recordUpdateXmlTelemetryForCertPinning(false, err);
+        }
+        return downloadLocalConfig();
+      });
+
+    addonPromise.then(
+      res => {
+        if (!res || !res.addons) {
+          this._deferred.resolve({ addons: [] });
+        } else {
+          res.addons = res.addons.map(a => new GMPAddon(a));
+          this._deferred.resolve(res);
+        }
+        delete this._deferred;
+      },
+      ex => {
+        this._deferred.reject(ex);
+        delete this._deferred;
+      }
+    );
+    return this._deferred.promise;
+  },
+  /**
+   * Installs the specified addon and calls a callback when done.
+   * @param gmpAddon The GMPAddon object to install
+   * @return a promise which will be resolved or rejected
+   *         The promise will resolve with an array of paths that were extracted
+   *         The promise will reject with an error object:
+   *           target: The XHR request object
+   *           status: The HTTP status code
+   *           type: A string to represent the type of error
+   *                 downloaderr, verifyerr or previouserrorencountered
+   */
+  installAddon(gmpAddon) {
+    if (this._deferred) {
+      let log = getScopedLogger("GMPInstallManager.installAddon");
+      log.error("previous error encountered");
+      return Promise.reject({ type: "previouserrorencountered" });
+    }
+    this.gmpDownloader = new GMPDownloader(gmpAddon);
+    return this.gmpDownloader.start();
+  },
+  _getTimeSinceLastCheck() {
+    let now = Math.round(Date.now() / 1000);
+    // Default to 0 here because `now - 0` will be returned later if that case
+    // is hit. We want a large value so a check will occur.
+    let lastCheck = GMPPrefs.getInt(GMPPrefs.KEY_UPDATE_LAST_CHECK, 0);
+    // Handle clock jumps, return now since we want it to represent
+    // a lot of time has passed since the last check.
+    if (now < lastCheck) {
+      return now;
+    }
+    return now - lastCheck;
+  },
+  get _isEMEEnabled() {
+    return GMPPrefs.getBool(GMPPrefs.KEY_EME_ENABLED, true);
+  },
+  _isAddonEnabled(aAddon) {
+    return GMPPrefs.getBool(GMPPrefs.KEY_PLUGIN_ENABLED, true, aAddon);
+  },
+  _isAddonUpdateEnabled(aAddon) {
+    return (
+      this._isAddonEnabled(aAddon) &&
+      GMPPrefs.getBool(GMPPrefs.KEY_PLUGIN_AUTOUPDATE, true, aAddon)
+    );
+  },
+  _updateLastCheck() {
+    let now = Math.round(Date.now() / 1000);
+    GMPPrefs.setInt(GMPPrefs.KEY_UPDATE_LAST_CHECK, now);
+  },
+  _versionchangeOccurred() {
+    let savedBuildID = GMPPrefs.getString(GMPPrefs.KEY_BUILDID, "");
+    let buildID = Services.appinfo.platformBuildID || "";
+    if (savedBuildID == buildID) {
+      return false;
+    }
+    GMPPrefs.setString(GMPPrefs.KEY_BUILDID, buildID);
+    return true;
+  },
+  /**
+   * Wrapper for checkForAddons and installAddon.
+   * Will only install if not already installed and will log the results.
+   * This will only install/update the OpenH264 and EME plugins
+   * @return a promise which will be resolved if all addons could be installed
+   *         successfully, rejected otherwise.
+   */
+  async simpleCheckAndInstall() {
+    let log = getScopedLogger("GMPInstallManager.simpleCheckAndInstall");
+
+    if (this._versionchangeOccurred()) {
+      log.info(
+        "A version change occurred. Ignoring " +
+          "media.gmp-manager.lastCheck to check immediately for " +
+          "new or updated GMPs."
+      );
+    } else {
+      let secondsBetweenChecks = GMPPrefs.getInt(
+        GMPPrefs.KEY_SECONDS_BETWEEN_CHECKS,
+        DEFAULT_SECONDS_BETWEEN_CHECKS
+      );
+      let secondsSinceLast = this._getTimeSinceLastCheck();
+      log.info(
+        "Last check was: " +
+          secondsSinceLast +
+          " seconds ago, minimum seconds: " +
+          secondsBetweenChecks
+      );
+      if (secondsBetweenChecks > secondsSinceLast) {
+        log.info("Will not check for updates.");
+        return { status: "too-frequent-no-check" };
+      }
+    }
+
+    try {
+      let { usedFallback, addons } = await this.checkForAddons();
+      this._updateLastCheck();
+      log.info("Found " + addons.length + " addons advertised.");
+      let addonsToInstall = addons.filter(function (gmpAddon) {
+        log.info("Found addon: " + gmpAddon.toString());
+
+        if (!gmpAddon.isValid) {
+          log.info("Addon |" + gmpAddon.id + "| is invalid.");
+          return false;
+        }
+
+        if (GMPUtils.isPluginHidden(gmpAddon)) {
+          log.info("Addon |" + gmpAddon.id + "| has been hidden.");
+          return false;
+        }
+
+        if (gmpAddon.isInstalled) {
+          log.info("Addon |" + gmpAddon.id + "| already installed.");
+          return false;
+        }
+
+        // Do not install from fallback if already installed as it
+        // may be a downgrade
+        if (usedFallback && gmpAddon.isUpdate) {
+          log.info(
+            "Addon |" +
+              gmpAddon.id +
+              "| not installing updates based " +
+              "on fallback."
+          );
+          return false;
+        }
+
+        let addonUpdateEnabled = false;
+        if (GMP_PLUGIN_IDS.includes(gmpAddon.id)) {
+          if (!this._isAddonEnabled(gmpAddon.id)) {
+            log.info(
+              "GMP |" + gmpAddon.id + "| has been disabled; skipping check."
+            );
+          } else if (!this._isAddonUpdateEnabled(gmpAddon.id)) {
+            log.info(
+              "Auto-update is off for " + gmpAddon.id + ", skipping check."
+            );
+          } else {
+            addonUpdateEnabled = true;
+          }
+        } else {
+          // Currently, we only support installs of OpenH264 and EME plugins.
+          log.info(
+            "Auto-update is off for unknown plugin '" +
+              gmpAddon.id +
+              "', skipping check."
+          );
+        }
+
+        return addonUpdateEnabled;
+      }, this);
+
+      if (!addonsToInstall.length) {
+        let now = Math.round(Date.now() / 1000);
+        GMPPrefs.setInt(GMPPrefs.KEY_UPDATE_LAST_EMPTY_CHECK, now);
+        log.info("No new addons to install, returning");
+        return { status: "nothing-new-to-install" };
+      }
+
+      let installResults = [];
+      let failureEncountered = false;
+      for (let addon of addonsToInstall) {
+        try {
+          await this.installAddon(addon);
+          installResults.push({
+            id: addon.id,
+            result: "succeeded",
+          });
+        } catch (e) {
+          failureEncountered = true;
+          installResults.push({
+            id: addon.id,
+            result: "failed",
+          });
+        }
+      }
+      if (failureEncountered) {
+        // eslint-disable-next-line no-throw-literal
+        throw { status: "failed", results: installResults };
+      }
+      return { status: "succeeded", results: installResults };
+    } catch (e) {
+      log.error("Could not check for addons", e);
+      throw e;
+    }
+  },
+
+  /**
+   * Makes sure everything is cleaned up
+   */
+  uninit() {
+    let log = getScopedLogger("GMPInstallManager.uninit");
+    if (this._request) {
+      log.info("Aborting request");
+      this._request.abort();
+    }
+    if (this._deferred) {
+      log.info("Rejecting deferred");
+      this._deferred.reject({ type: "uninitialized" });
+    }
+    log.info("Done cleanup");
+  },
+
+  /**
+   * If set to true, specifies to leave the temporary downloaded zip file.
+   * This is useful for tests.
+   */
+  overrideLeaveDownloadedZip: false,
+};
+
+/**
+ * Used to construct a single GMP addon
+ * GMPAddon objects are returns from GMPInstallManager.checkForAddons
+ * GMPAddon objects can also be used in calls to GMPInstallManager.installAddon
+ *
+ * @param addon The ProductAddonChecker `addon` object
+ */
+export function GMPAddon(addon) {
+  let log = getScopedLogger("GMPAddon.constructor");
+  for (let name of Object.keys(addon)) {
+    this[name] = addon[name];
+  }
+  log.info("Created new addon: " + this.toString());
+}
+
+GMPAddon.prototype = {
+  /**
+   * Returns a string representation of the addon
+   */
+  toString() {
+    return (
+      this.id +
+      " (" +
+      "isValid: " +
+      this.isValid +
+      ", isInstalled: " +
+      this.isInstalled +
+      ", hashFunction: " +
+      this.hashFunction +
+      ", hashValue: " +
+      this.hashValue +
+      (this.size !== undefined ? ", size: " + this.size : "") +
+      ")"
+    );
+  },
+  /**
+   * If all the fields aren't specified don't consider this addon valid
+   * @return true if the addon is parsed and valid
+   */
+  get isValid() {
+    return (
+      this.id &&
+      this.URL &&
+      this.version &&
+      this.hashFunction &&
+      !!this.hashValue
+    );
+  },
+  get isInstalled() {
+    return (
+      this.version &&
+      !!this.hashValue &&
+      GMPPrefs.getString(GMPPrefs.KEY_PLUGIN_VERSION, "", this.id) ===
+        this.version &&
+      GMPPrefs.getString(GMPPrefs.KEY_PLUGIN_HASHVALUE, "", this.id) ===
+        this.hashValue
+    );
+  },
+  get isEME() {
+    return this.id == WIDEVINE_ID;
+  },
+  get isOpenH264() {
+    return this.id == "gmp-gmpopenh264";
+  },
+  /**
+   * @return true if the addon has been previously installed and this is
+   * a new version, if this is a fresh install return false
+   */
+  get isUpdate() {
+    return (
+      this.version &&
+      GMPPrefs.getBool(GMPPrefs.KEY_PLUGIN_VERSION, false, this.id)
+    );
+  },
+};
+
+/**
+ * Constructs a GMPExtractor object which is used to extract a GMP zip
+ * into the specified location.
+ * @param zipPath The path on disk of the zip file to extract
+ * @param relativePath The relative path components inside the profile directory
+ *                     to extract the zip to.
+ */
+export function GMPExtractor(zipPath, relativeInstallPath) {
+  this.zipPath = zipPath;
+  this.relativeInstallPath = relativeInstallPath;
+}
+
+GMPExtractor.prototype = {
+  /**
+   * Installs the this.zipPath contents into the directory used to store GMP
+   * addons for the current platform.
+   *
+   * @return a promise which will be resolved or rejected
+   *         See GMPInstallManager.installAddon for resolve/rejected info
+   */
+  install() {
+    this._deferred = PromiseUtils.defer();
+    let deferredPromise = this._deferred;
+    let { zipPath, relativeInstallPath } = this;
+    // Escape the zip path since the worker will use it as a URI
+    let zipFile = new lazy.FileUtils.File(zipPath);
+    let zipURI = Services.io.newFileURI(zipFile).spec;
+    let worker = new ChromeWorker(
+      "resource://gre/modules/GMPExtractorWorker.js"
+    );
+    worker.onmessage = function (msg) {
+      let log = getScopedLogger("GMPExtractor");
+      worker.terminate();
+      if (msg.data.result != "success") {
+        log.error("Failed to extract zip file: " + zipURI);
+        return deferredPromise.reject({
+          target: this,
+          status: msg.data.exception,
+          type: "exception",
+        });
+      }
+      log.info("Successfully extracted zip file: " + zipURI);
+      return deferredPromise.resolve(msg.data.extractedPaths);
+    };
+    worker.postMessage({ zipURI, relativeInstallPath });
+    return this._deferred.promise;
+  },
+};
+
+/**
+ * Constructs an object which downloads and initiates an install of
+ * the specified GMPAddon object.
+ * @param gmpAddon The addon to install.
+ */
+export function GMPDownloader(gmpAddon) {
+  this._gmpAddon = gmpAddon;
+}
+
+GMPDownloader.prototype = {
+  /**
+   * Starts the download process for an addon.
+   * @return a promise which will be resolved or rejected
+   *         See GMPInstallManager.installAddon for resolve/rejected info
+   */
+  start() {
+    let log = getScopedLogger("GMPDownloader");
+    let gmpAddon = this._gmpAddon;
+    let now = Math.round(Date.now() / 1000);
+    GMPPrefs.setInt(GMPPrefs.KEY_PLUGIN_LAST_INSTALL_START, now, gmpAddon.id);
+
+    if (!gmpAddon.isValid) {
+      log.info("gmpAddon is not valid, will not continue");
+      return Promise.reject({
+        target: this,
+        type: "downloaderr",
+      });
+    }
+    // If the HTTPS-Only Mode is enabled, every insecure request gets upgraded
+    // by default. This upgrade has to be prevented for openh264 downloads since
+    // the server doesn't support https://
+    const downloadOptions = {
+      httpsOnlyNoUpgrade: gmpAddon.isOpenH264,
+    };
+    return ProductAddonChecker.downloadAddon(gmpAddon, downloadOptions).then(
+      zipPath => {
+        let now = Math.round(Date.now() / 1000);
+        GMPPrefs.setInt(GMPPrefs.KEY_PLUGIN_LAST_DOWNLOAD, now, gmpAddon.id);
+        log.info(
+          `install to directory path: ${gmpAddon.id}/${gmpAddon.version}`
+        );
+        let gmpInstaller = new GMPExtractor(zipPath, [
+          gmpAddon.id,
+          gmpAddon.version,
+        ]);
+        let installPromise = gmpInstaller.install();
+        return installPromise.then(
+          extractedPaths => {
+            // Success, set the prefs
+            let now = Math.round(Date.now() / 1000);
+            GMPPrefs.setInt(GMPPrefs.KEY_PLUGIN_LAST_UPDATE, now, gmpAddon.id);
+            // Remember our ABI, so that if the profile is migrated to another
+            // platform or from 32 -> 64 bit, we notice and don't try to load the
+            // unexecutable plugin library.
+            let abi = GMPUtils._expectedABI(gmpAddon);
+            log.info("Setting ABI to '" + abi + "' for " + gmpAddon.id);
+            GMPPrefs.setString(GMPPrefs.KEY_PLUGIN_ABI, abi, gmpAddon.id);
+            // We use the combination of the hash and version to ensure we are
+            // up to date.
+            GMPPrefs.setString(
+              GMPPrefs.KEY_PLUGIN_HASHVALUE,
+              gmpAddon.hashValue,
+              gmpAddon.id
+            );
+            // Setting the version pref signals installation completion to consumers,
+            // if you need to set other prefs etc. do it before this.
+            GMPPrefs.setString(
+              GMPPrefs.KEY_PLUGIN_VERSION,
+              gmpAddon.version,
+              gmpAddon.id
+            );
+            return extractedPaths;
+          },
+          reason => {
+            GMPPrefs.setString(
+              GMPPrefs.KEY_PLUGIN_LAST_INSTALL_FAIL_REASON,
+              reason,
+              gmpAddon.id
+            );
+            let now = Math.round(Date.now() / 1000);
+            GMPPrefs.setInt(
+              GMPPrefs.KEY_PLUGIN_LAST_INSTALL_FAILED,
+              now,
+              gmpAddon.id
+            );
+            throw reason;
+          }
+        );
+      },
+      reason => {
+        GMPPrefs.setString(
+          GMPPrefs.KEY_PLUGIN_LAST_DOWNLOAD_FAIL_REASON,
+          reason,
+          gmpAddon.id
+        );
+        let now = Math.round(Date.now() / 1000);
+        GMPPrefs.setInt(
+          GMPPrefs.KEY_PLUGIN_LAST_DOWNLOAD_FAILED,
+          now,
+          gmpAddon.id
+        );
+        throw reason;
+      }
+    );
+  },
+};