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amp-call-tracking.js
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amp-call-tracking.js
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/**
* Copyright 2017 The AMP HTML Authors. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {assertHttpsUrl} from '../../../src/url';
import {Layout, isLayoutSizeDefined} from '../../../src/layout';
import {Services} from '../../../src/services';
import {user} from '../../../src/log';
/**
* Bookkeeps all unique URL requests so that no URL is called twice.
* @type {!Object<string, !Promise>}
*/
let cachedResponsePromises_ = {};
/**
* Fetches vendor response.
* @param {!Window} win
* @param {string} url
* @return {!Promise<JsonObject>}
*/
function fetch_(win, url) {
if (!(url in cachedResponsePromises_)) {
cachedResponsePromises_[url] = Services.xhrFor(win)
.fetchJson(url, {credentials: 'include'})
.then(res => res.json());
}
return cachedResponsePromises_[url];
}
/** @visibleForTesting */
export function clearResponseCacheForTesting() {
cachedResponsePromises_ = {};
}
/**
* Implementation of `amp-call-tracking` component. See
* {@link ../amp-call-tracking.md} for the spec.
*/
export class AmpCallTracking extends AMP.BaseElement {
/** @param {!AmpElement} element */
constructor(element) {
super(element);
/** @private {?Element} */
this.hyperlink_ = null;
/** @private {?string} */
this.configUrl_ = null;
}
/** @override */
isLayoutSupported(layout) {
return isLayoutSizeDefined(layout) || layout == Layout.CONTAINER;
}
/** @override */
buildCallback() {
this.configUrl_ = assertHttpsUrl(
this.element.getAttribute('config'), this.element);
this.hyperlink_ = this.element.firstElementChild;
}
/** @override */
layoutCallback() {
return Services.urlReplacementsForDoc(this.getAmpDoc())
.expandUrlAsync(user().assertString(this.configUrl_))
.then(url => fetch_(this.win, url))
.then(data => {
user().assert('phoneNumber' in data,
'Response must contain a non-empty phoneNumber field %s',
this.element);
this.hyperlink_.setAttribute('href', `tel:${data['phoneNumber']}`);
this.hyperlink_.textContent = data['formattedPhoneNumber']
|| data['phoneNumber'];
});
}
}
AMP.extension('amp-call-tracking', '0.1', AMP => {
AMP.registerElement('amp-call-tracking', AmpCallTracking);
});