Refactor AmpContext dependencies for building

3p/ampcontext-lib.js

@@ -13,11 +13,17 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import './polyfills';
 import {AmpContext} from './ampcontext.js';
 import {initLogConstructor, setReportError} from '../src/log';
-import {reportError} from '../src/error';
+
+
 initLogConstructor();
-setReportError(reportError);
+
+
+// TODO(alanorozco): Refactor src/error.reportError so it does not contain big
+// transitive dependencies and can be included here.
+setReportError(() => {});
 
 
 /**

3p/ampcontext.js

@@ -13,24 +13,44 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import './polyfills';
 import {dev} from '../src/log';
 import {IframeMessagingClient} from './iframe-messaging-client';
-import {MessageType} from '../src/3p-frame';
+import {MessageType} from '../src/3p-frame-messaging';
 import {tryParseJson} from '../src/json';
 
 export class AmpContext {
 
   /**
-   *  @param {Window} win The window that the instance is built inside.
+   *  @param {!Window} win The window that the instance is built inside.
    */
   constructor(win) {
+    /** @private {!Window} */
     this.win_ = win;
 
+    /** @type {?string} */
+    this.location = null;
+
+    /** @type {?string} */
+    this.canonicalUrl = null;
+
+    /** @type {?string} */
+    this.pageViewId = null;
+
+    /** @type {?string} */
+    this.sentinel = null;
+
+    // TODO(alanorozco): confirm type
+    /** @type {?} */
+    this.startTime = null;
+
+    // TODO(alanorozco): confirm type
+    /** @type {?string} */
+    this.referrer = null;
+
     this.findAndSetMetadata_();
     this.client_ = new IframeMessagingClient(win);
     this.client_.setHostWindow(this.getHostWindow_());
-    this.client_.setSentinel(this.sentinel);
+    this.client_.setSentinel(dev().assertString(this.sentinel));
   }
 
   /**
@@ -64,8 +84,8 @@ export class AmpContext {
   /**
    *  Send message to runtime requesting to resize ad to height and width.
    *    This is not guaranteed to succeed. All this does is make the request.
-   *  @param {int} width The new width for the ad we are requesting.
-   *  @param {int} height The new height for the ad we are requesting.
+   *  @param {number} width The new width for the ad we are requesting.
+   *  @param {number} height The new height for the ad we are requesting.
    */
   requestResize(width, height) {
     this.client_.sendMessage(MessageType.EMBED_SIZE, {width, height});
@@ -75,8 +95,8 @@ export class AmpContext {
    *  Allows a creative to set the callback function for when the resize
    *    request returns a success. The callback should be set before resizeAd
    *    is ever called.
-   *  @param {function(requestedHeight, requestedWidth)} callback Function
-   *    to call if the resize request succeeds.
+   *  @param {function(number, number)} callback Function to call if the resize
+   *    request succeeds.
    */
   onResizeSuccess(callback) {
     this.client_.registerCallback(MessageType.EMBED_SIZE_CHANGED, obj => {
@@ -87,8 +107,8 @@ export class AmpContext {
    *  Allows a creative to set the callback function for when the resize
    *    request is denied. The callback should be set before resizeAd
    *    is ever called.
-   *  @param {function(requestedHeight, requestedWidth)} callback Function
-   *    to call if the resize request is denied.
+   *  @param {function(number, number)} callback Function to call if the resize
+   *    request is denied.
    */
   onResizeDenied(callback) {
     this.client_.registerCallback(MessageType.EMBED_SIZE_DENIED, obj => {
@@ -99,7 +119,7 @@ export class AmpContext {
   /**
    *  Takes the current name on the window, and attaches it to
    *  the name of the iframe.
-   *  @param {HTMLIframeElement} iframe The iframe we are adding the context to.
+   *  @param {HTMLIFrameElement} iframe The iframe we are adding the context to.
    */
   addContextToIframe(iframe) {
     iframe.name = this.win_.name;
@@ -108,15 +128,15 @@ export class AmpContext {
   /**
    *  Parse the metadata attributes from the name and add them to
    *  the class instance.
-   *  @param {!Object|string} contextData
+   *  @param {!Object|string} data
    *  @private
    */
   setupMetadata_(data) {
-    data = tryParseJson(data);
-    if (!data) {
+    const dataObject = typeof data === 'string' ? tryParseJson(data) : data;
+    if (!dataObject) {
       throw new Error('Could not setup metadata.');
     }
-    const context = data._context;
+    const context = dataObject._context;
     this.location = context.location;
     this.canonicalUrl = context.canonicalUrl;
     this.pageViewId = context.pageViewId;
@@ -149,6 +169,8 @@ export class AmpContext {
   findAndSetMetadata_() {
     // If the context data is set on window, that means we don't need
     // to check the name attribute as it has been bypassed.
+    // TODO(alanorozco): why the heck could AMP_CONTEXT_DATA be two different
+    // types? FIX THIS.
     if (!this.win_.AMP_CONTEXT_DATA) {
       this.setupMetadata_(this.win_.name);
     } else if (typeof this.win_.AMP_CONTEXT_DATA == 'string') {

3p/iframe-messaging-client.js

@@ -13,9 +13,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {listen} from '../src/event-helper';
 import {map} from '../src/utils/object';
-import {serializeMessage, deserializeMessage} from '../src/3p-frame';
+import {
+  listen,
+  serializeMessage,
+  deserializeMessage,
+} from '../src/3p-frame-messaging';
 import {getMode} from '../src/mode';
 import {dev} from '../src/log';
 

3p/integration.js

@@ -23,7 +23,9 @@
  */
 
 import './polyfills';
+import {AmpContext} from './ampcontext';
 import {installEmbedStateListener, manageWin} from './environment';
+import {isExperimentOn} from '../src/experiments';
 import {nonSensitiveDataPostMessage, listenParent} from './messaging';
 import {
   computeInMasterFrame,
@@ -151,6 +153,11 @@ import {zedo} from '../ads/zedo';
 import {zergnet} from '../ads/zergnet';
 import {zucks} from '../ads/zucks';
 
+
+/** @const {string} */
+const AMP_CONTEXT_EXPERIMENT = '3p-use-ampcontext';
+
+
 /**
  * Whether the embed type may be used with amp-embed tag.
  * @const {!Object<string, boolean>}
@@ -396,57 +403,23 @@ function isMaster() {
 window.draw3p = function(opt_configCallback, opt_allowed3pTypes,
     opt_allowedEmbeddingOrigins) {
   try {
+    const location = parseUrl(data._context.location.href);
+
     ensureFramed(window);
-    window.context.location = parseUrl(data._context.location.href);
-    validateParentOrigin(window, window.context.location);
+    validateParentOrigin(window, location);
     validateAllowedTypes(window, data.type, opt_allowed3pTypes);
     if (opt_allowedEmbeddingOrigins) {
       validateAllowedEmbeddingOrigins(window, opt_allowedEmbeddingOrigins);
     }
-    // Define master related properties to be lazily read.
-    Object.defineProperties(window.context, {
-      master: {
-        get: () => masterSelection(data.type),
-      },
-      isMaster: {
-        get: isMaster,
-      },
-    });
-    window.context.data = data;
-    window.context.noContentAvailable = triggerNoContentAvailable;
-    window.context.requestResize = triggerResizeRequest;
-    window.context.renderStart = triggerRenderStart;
-
-    if (data.type === 'facebook' || data.type === 'twitter') {
-      // Only make this available to selected embeds until the
-      // generic solution is available.
-      window.context.updateDimensions = triggerDimensions;
-    }
-
-    // This only actually works for ads.
-    const initialIntersection = window.context.initialIntersection;
-    window.context.observeIntersection = cb => {
-      const unlisten = observeIntersection(cb);
-      // Call the callback with the value that was transmitted when the
-      // iframe was drawn. Called in nextTick, so that callers don't
-      // have to specially handle the sync case.
-      nextTick(window, () => cb([initialIntersection]));
-      return unlisten;
-    };
-    window.context.onResizeSuccess = onResizeSuccess;
-    window.context.onResizeDenied = onResizeDenied;
-    window.context.reportRenderedEntityIdentifier =
-        reportRenderedEntityIdentifier;
-    window.context.computeInMasterFrame = computeInMasterFrame;
-    window.context.addContextToIframe = iframe => {
-      iframe.name = iframeName;
-    };
-    window.context.getHtml = getHtml;
+    installContext(window);
     delete data._context;
     manageWin(window);
     installEmbedStateListener();
     draw3p(window, data, opt_configCallback);
     updateVisibilityState(window);
+
+    // TODO(alanorozco): use IframeMessagingClient for updates when experiment
+    //                   flag is on.
     // Subscribe to page visibility updates.
     nonSensitiveDataPostMessage('send-embed-state');
     nonSensitiveDataPostMessage('bootstrap-loaded');
@@ -459,6 +432,60 @@ window.draw3p = function(opt_configCallback, opt_allowed3pTypes,
   }
 };
 
+function installContext(win) {
+  if (isExperimentOn(win, AMP_CONTEXT_EXPERIMENT)) {
+    // TODO(alanorozco): Enhance AmpContext to match standard implementation.
+    win.context = new AmpContext(win);
+    return;
+  }
+
+  installContextUsingStandardImpl(win);
+}
+
+function installContextUsingStandardImpl(win) {
+  // Define master related properties to be lazily read.
+  Object.defineProperties(win.context, {
+    master: {
+      get: () => masterSelection(data.type),
+    },
+    isMaster: {
+      get: isMaster,
+    },
+  });
+
+  win.context.data = data;
+  win.context.location = parseUrl(data._context.location.href);
+  win.context.noContentAvailable = triggerNoContentAvailable;
+  win.context.requestResize = triggerResizeRequest;
+  win.context.renderStart = triggerRenderStart;
+
+  if (data.type === 'facebook' || data.type === 'twitter') {
+    // Only make this available to selected embeds until the
+    // generic solution is available.
+    win.context.updateDimensions = triggerDimensions;
+  }
+
+  // This only actually works for ads.
+  const initialIntersection = win.context.initialIntersection;
+  win.context.observeIntersection = cb => {
+    const unlisten = observeIntersection(cb);
+    // Call the callback with the value that was transmitted when the
+    // iframe was drawn. Called in nextTick, so that callers don't
+    // have to specially handle the sync case.
+    nextTick(win, () => cb([initialIntersection]));
+    return unlisten;
+  };
+  win.context.onResizeSuccess = onResizeSuccess;
+  win.context.onResizeDenied = onResizeDenied;
+  win.context.reportRenderedEntityIdentifier =
+      reportRenderedEntityIdentifier;
+  win.context.computeInMasterFrame = computeInMasterFrame;
+  win.context.addContextToIframe = iframe => {
+    iframe.name = iframeName;
+  };
+  win.context.getHtml = getHtml;
+}
+
 function triggerNoContentAvailable() {
   nonSensitiveDataPostMessage('no-content');
 }

ads/inabox/inabox-messaging-host.js

@@ -19,7 +19,7 @@ import {
   serializeMessage,
   deserializeMessage,
   MessageType,
-} from '../../src/3p-frame';
+} from '../../src/3p-frame-messaging';
 import {dev} from '../../src/log';
 
 /** @const */

build-system/amp.extern.js

@@ -47,6 +47,8 @@ window.AMP_CONFIG.thirdPartyFrameRegex;
 window.AMP_CONFIG.cdnUrl;
 window.AMP_CONFIG.errorReportingUrl;
 
+window.AMP_CONTEXT_DATA;
+
 // amp-viz-vega related externs.
 /**
  * @typedef {{spec: function(!JSONType, function())}}

build-system/tasks/presubmit-checks.js

@@ -424,6 +424,15 @@ var forbiddenTerms = {
       'src/inabox/inabox-viewer.js',
     ],
   },
+  'internalListenImplementation': {
+    message: 'Use `listen()` in either `event-helper` or `3p-frame-messaging`' +
+        ', depending on your use case.',
+    whitelist: [
+      'src/3p-frame-messaging.js',
+      'src/event-helper.js',
+      'src/event-helper-listen.js',
+    ],
+  },
   'setTimeout.*throw': {
     message: 'Use dev.error or user.error instead.',
     whitelist: [

gulpfile.js

@@ -557,6 +557,13 @@ function checkTypes() {
         includePolyfills: true,
         checkTypes: true,
       }),
+    closureCompile(['./3p/ampcontext-lib.js'], './dist',
+      'ampcontext-check-types.js', {
+        externs: ['ads/ads.extern.js'],
+        include3pDirectories: true,
+        includePolyfills: true,
+        checkTypes: true,
+      }),
   ]);
 }