Bug 975000 - Disable updating and compatibility checking for Experiments; r=Unfocused

Experiment add-ons are installed and updated via the Experiments Manager
service. With this change, the Add-ons Manager lets experiment add-ons
play by their own rules without interference.

--HG--
extra : rebase_source : 12f990198fed7171b9572c24aa2f8319620414a2

toolkit/mozapps/extensions/AddonManager.jsm

@@ -2317,7 +2317,25 @@ this.AddonManagerPrivate = {
     return {
       done: () => this.recordSimpleMeasure(aName, Date.now() - startTime)
     };
-  }
+  },
+
+  /**
+   * Helper to call update listeners when no update is available.
+   *
+   * This can be used as an implementation for Addon.findUpdates() when
+   * no update mechanism is available.
+   */
+  callNoUpdateListeners: function (addon, listener, reason, appVersion, platformVersion) {
+    if ("onNoCompatibilityUpdateAvailable" in listener) {
+      safeCall(listener.onNoCompatibilityUpdateAvailable.bind(listener), addon);
+    }
+    if ("onNoUpdateAvailable" in listener) {
+      safeCall(listener.onNoUpdateAvailable.bind(listener), addon);
+    }
+    if ("onUpdateFinished" in listener) {
+      safeCall(listener.onUpdateFinished.bind(listener), addon);
+    }
+  },
 };
 
 /**

toolkit/mozapps/extensions/LightweightThemeManager.jsm

@@ -508,12 +508,7 @@ function AddonWrapper(aTheme) {
   };
 
   this.findUpdates = function AddonWrapper_findUpdates(listener, reason, appVersion, platformVersion) {
-    if ("onNoCompatibilityUpdateAvailable" in listener)
-      listener.onNoCompatibilityUpdateAvailable(this);
-    if ("onNoUpdateAvailable" in listener)
-      listener.onNoUpdateAvailable(this);
-    if ("onUpdateFinished" in listener)
-      listener.onUpdateFinished(this);
+    AddonManagerPrivate.callNoUpdateListeners(this, listener, reason, appVersion, platformVersion);
   };
 }
 

toolkit/mozapps/extensions/internal/XPIProvider.jsm

@@ -915,6 +915,17 @@ function loadManifestFromRDF(aUri, aStream) {
 
   addon.applyBackgroundUpdates = AddonManager.AUTOUPDATE_DEFAULT;
 
+  // Experiments are managed and updated through an external "experiments
+  // manager." So disable some built-in mechanisms.
+  if (addon.type == "experiment") {
+    addon.applyBackgroundUpdates = AddonManager.AUTOUPDATE_DISABLE;
+    addon.updateURL = null;
+    addon.updateKey = null;
+
+    addon.targetApplications = [];
+    addon.targetPlatforms = [];
+  }
+
   // Load the storage service before NSS (nsIRandomGenerator),
   // to avoid a SQLite initialization error (bug 717904).
   let storage = Services.storage;
@@ -6014,6 +6025,17 @@ AddonInternal.prototype = {
   },
 
   isCompatibleWith: function AddonInternal_isCompatibleWith(aAppVersion, aPlatformVersion) {
+    // Experiments are installed through an external mechanism that
+    // limits target audience to compatible clients. We trust it knows what
+    // it's doing and skip compatibility checks.
+    //
+    // This decision does forfeit defense in depth. If the experiments system
+    // is ever wrong about targeting an add-on to a specific application
+    // or platform, the client will likely see errors.
+    if (this.type == "experiment") {
+      return true;
+    }
+
     let app = this.matchingTargetApplication;
     if (!app)
       return false;
@@ -6398,6 +6420,11 @@ function AddonWrapper(aAddon) {
     return aAddon.applyBackgroundUpdates;
   });
   this.__defineSetter__("applyBackgroundUpdates", function AddonWrapper_applyBackgroundUpdatesSetter(val) {
+    if (this.type == "experiment") {
+      logger.warn("Setting applyBackgroundUpdates on an experiment is not supported.");
+      return;
+    }
+
     if (val != AddonManager.AUTOUPDATE_DEFAULT &&
         val != AddonManager.AUTOUPDATE_DISABLE &&
         val != AddonManager.AUTOUPDATE_ENABLE) {
@@ -6498,22 +6525,33 @@ function AddonWrapper(aAddon) {
     if (!(aAddon.inDatabase))
       return permissions;
 
+    // Experiments can only be uninstalled. An uninstall reflects the user
+    // intent of "disable this experiment." This is partially managed by the
+    // experiments manager.
+    if (aAddon.type == "experiment") {
+      return AddonManager.PERM_CAN_UNINSTALL;
+    }
+
     if (!aAddon.appDisabled) {
-      if (this.userDisabled)
+      if (this.userDisabled) {
         permissions |= AddonManager.PERM_CAN_ENABLE;
-      else if (aAddon.type != "theme")
+      }
+      else if (aAddon.type != "theme") {
         permissions |= AddonManager.PERM_CAN_DISABLE;
+      }
     }
 
     // Add-ons that are in locked install locations, or are pending uninstall
     // cannot be upgraded or uninstalled
     if (!aAddon._installLocation.locked && !aAddon.pendingUninstall) {
       // Add-ons that are installed by a file link cannot be upgraded
-      if (!aAddon._installLocation.isLinkedAddon(aAddon.id))
+      if (!aAddon._installLocation.isLinkedAddon(aAddon.id)) {
         permissions |= AddonManager.PERM_CAN_UPGRADE;
+      }
 
       permissions |= AddonManager.PERM_CAN_UNINSTALL;
     }
+
     return permissions;
   });
 
@@ -6595,6 +6633,14 @@ function AddonWrapper(aAddon) {
   };
 
   this.findUpdates = function AddonWrapper_findUpdates(aListener, aReason, aAppVersion, aPlatformVersion) {
+    // Short-circuit updates for experiments because updates are handled
+    // through the Experiments Manager.
+    if (this.type == "experiment") {
+      AddonManagerPrivate.callNoUpdateListeners(this, aListener, aReason,
+                                                aAppVersion, aPlatformVersion);
+      return;
+    }
+
     new UpdateChecker(aAddon, aListener, aReason, aAppVersion, aPlatformVersion);
   };
 

toolkit/mozapps/extensions/test/addons/test_experiment1/install.rdf

@@ -0,0 +1,17 @@
+<?xml version="1.0"?>
+
+<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+     xmlns:em="http://www.mozilla.org/2004/em-rdf#">
+
+  <Description about="urn:mozilla:install-manifest">
+    <em:id>experiment1@tests.mozilla.org</em:id>
+    <em:version>1.0</em:version>
+    <em:type>128</em:type>
+    <em:bootstrap>true</em:bootstrap>
+
+    <!-- Front End MetaData -->
+    <em:name>Test Experiment 1</em:name>
+    <em:description>Test Description</em:description>
+
+  </Description>
+</RDF>

toolkit/mozapps/extensions/test/browser/browser_experiments.js

@@ -50,9 +50,7 @@ add_test(function testActiveExperiment() {
   install_addon("addons/browser_experiment1.xpi", (addon) => {
     gInstalledAddons.push(addon);
 
-    // This may change if we remove compatibility checking from experiments.
-    // Putting this check here so a test fails if preconditions change.
-    Assert.equal(addon.isActive, false, "Add-on is not active.");
+    Assert.ok(addon.isActive, "Add-on is active.");
 
     Assert.ok(gCategoryUtilities.isTypeVisible("experiment"), "Experiment tab visible.");
 
@@ -133,3 +131,19 @@ add_test(function testOpenPreferences() {
     EventUtils.synthesizeMouseAtCenter(btn, {}, gManagerWindow);
   });
 });
+
+add_test(function testButtonPresence() {
+  gCategoryUtilities.openType("experiment", (win) => {
+    let item = get_addon_element(gManagerWindow, "test-experiment1@experiments.mozilla.org");
+    Assert.ok(item, "Got add-on element.");
+
+    let el = item.ownerDocument.getAnonymousElementByAttribute(item, "anonid", "remove-btn");
+    // Corresponds to the uninstall permission.
+    is_element_visible(el, "Remove button is visible.");
+    // Corresponds to lack of disable permission.
+    el = item.ownerDocument.getAnonymousElementByAttribute(item, "anonid", "disable-btn");
+    is_element_hidden(el, "Disable button not visible.");
+
+    run_next_test();
+  });
+});

toolkit/mozapps/extensions/test/xpcshell/test_experiment.js

@@ -0,0 +1,48 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function run_test() {
+  createAppInfo("xpcshell@tests.mozilla.org", "XPCShell", "1", "1.9.2");
+  startupManager();
+
+  run_next_test();
+}
+
+add_test(function test_experiment() {
+  AddonManager.getInstallForFile(do_get_addon("test_experiment1"), (install) => {
+    completeAllInstalls([install], () => {
+      AddonManager.getAddonByID("experiment1@tests.mozilla.org", (addon) => {
+        Assert.ok(addon, "Addon is found.");
+
+        Assert.ok(addon.isActive, "Add-on is active.");
+        Assert.equal(addon.updateURL, null, "No updateURL for experiments.");
+        Assert.equal(addon.applyBackgroundUpdates, AddonManager.AUTOUPDATE_DISABLE,
+                     "Background updates are disabled.");
+        Assert.equal(addon.permissions, AddonManager.PERM_CAN_UNINSTALL,
+                     "Permissions are minimal.");
+
+        // Setting applyBackgroundUpdates should not work.
+        addon.applyBackgroundUpdates = AddonManager.AUTOUPDATE_ENABLE;
+        Assert.equal(addon.applyBackgroundUpdates, AddonManager.AUTOUPDATE_DISABLE,
+                     "Setting applyBackgroundUpdates shouldn't do anything.");
+
+        let noCompatibleCalled = false;
+        let noUpdateCalled = false;
+        let finishedCalled = false;
+
+        let listener = {
+          onNoCompatibilityUpdateAvailable: () => { noCompatibleCalled = true; },
+          onNoUpdateAvailable: () => { noUpdateCalled = true; },
+          onUpdateFinished: () => { finishedCalled = true; },
+        };
+
+        addon.findUpdates(listener, "testing", null, null);
+        Assert.ok(noCompatibleCalled, "Listener called.");
+        Assert.ok(noUpdateCalled, "Listener called.");
+        Assert.ok(finishedCalled, "Listener called.");
+
+        run_next_test();
+      });
+    });
+  });
+});

toolkit/mozapps/extensions/test/xpcshell/test_shutdown.js

@@ -17,7 +17,8 @@ const IGNORE_PRIVATE = ["AddonAuthor", "AddonCompatibilityOverride",
                         "addStartupChange", "removeStartupChange",
                         "recordTimestamp", "recordSimpleMeasure",
                         "recordException", "getSimpleMeasures", "simpleTimer",
-                        "setTelemetryDetails", "getTelemetryDetails"];
+                        "setTelemetryDetails", "getTelemetryDetails",
+                        "callNoUpdateListeners"];
 
 function test_functions() {
   for (let prop in AddonManager) {

toolkit/mozapps/extensions/test/xpcshell/xpcshell-shared.ini

@@ -163,6 +163,7 @@ fail-if = os == "android"
 # Bug 676992: test consistently hangs on Android
 skip-if = os == "android"
 [test_error.js]
+[test_experiment.js]
 [test_filepointer.js]
 # Bug 676992: test consistently hangs on Android
 skip-if = os == "android"