forked from mirrors/gecko-dev
93 lines
2.8 KiB
JavaScript
93 lines
2.8 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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this.documentMetadata = (function() {
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function findSiteName() {
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let el = document.querySelector("meta[property~='og:site_name'][content]");
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if (el) {
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return el.getAttribute("content");
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}
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// nytimes.com uses this property:
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el = document.querySelector("meta[name='cre'][content]");
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if (el) {
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return el.getAttribute("content");
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}
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return null;
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}
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function getOpenGraph() {
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const openGraph = {};
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// If you update this, also update _OPENGRAPH_PROPERTIES in shot.js:
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const forceSingle = `title type url`.split(" ");
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const openGraphProperties = `
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title type url image audio description determiner locale site_name video
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image:secure_url image:type image:width image:height
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video:secure_url video:type video:width image:height
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audio:secure_url audio:type
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article:published_time article:modified_time article:expiration_time article:author article:section article:tag
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book:author book:isbn book:release_date book:tag
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profile:first_name profile:last_name profile:username profile:gender
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`.split(/\s+/g);
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for (const prop of openGraphProperties) {
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let elems = document.querySelectorAll(
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`meta[property~='og:${prop}'][content]`
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);
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if (forceSingle.includes(prop) && elems.length > 1) {
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elems = [elems[0]];
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}
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let value;
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if (elems.length > 1) {
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value = [];
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for (const elem of elems) {
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const v = elem.getAttribute("content");
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if (v) {
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value.push(v);
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}
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}
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if (!value.length) {
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value = null;
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}
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} else if (elems.length === 1) {
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value = elems[0].getAttribute("content");
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}
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if (value) {
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openGraph[prop] = value;
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}
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}
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return openGraph;
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}
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function getTwitterCard() {
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const twitterCard = {};
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// If you update this, also update _TWITTERCARD_PROPERTIES in shot.js:
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const properties = `
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card site title description image
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player player:width player:height player:stream player:stream:content_type
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`.split(/\s+/g);
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for (const prop of properties) {
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const elem = document.querySelector(
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`meta[name='twitter:${prop}'][content]`
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);
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if (elem) {
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const value = elem.getAttribute("content");
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if (value) {
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twitterCard[prop] = value;
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}
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}
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}
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return twitterCard;
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}
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return function documentMetadata() {
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const result = {};
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result.docTitle = document.title;
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result.siteName = findSiteName();
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result.openGraph = getOpenGraph();
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result.twitterCard = getTwitterCard();
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return result;
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};
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})();
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null;
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