forked from mirrors/gecko-dev
46 lines
1.4 KiB
JavaScript
46 lines
1.4 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* Collects Open Graph (https://opengraphprotocol.org/) related data from a page.
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*/
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export const OpenGraphPageData = {
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/**
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* Collects the opengraph data from the page.
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*
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* @param {Document} document
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* The document to collect from
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*
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* @returns {PageData}
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*/
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collect(document) {
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let pageData = {};
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// Sites can technically define an Open Graph prefix other than `og:`.
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// However, `og:` is one of the default RDFa prefixes and it's likely
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// uncommon that sites use a custom prefix. If we find that metadata is
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// missing for common sites due to this issue, we could consider adding a
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// basic RDFa parser.
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let openGraphTags = document.querySelectorAll("meta[property^='og:'");
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for (let tag of openGraphTags) {
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// Strip "og:" from the property name.
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let propertyName = tag.getAttribute("property").substring(3);
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switch (propertyName) {
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case "description":
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pageData.description = tag.getAttribute("content");
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break;
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case "site_name":
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pageData.siteName = tag.getAttribute("content");
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break;
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case "image":
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pageData.image = tag.getAttribute("content");
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break;
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}
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}
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return pageData;
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},
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};
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