104 lines
3.0 KiB
JavaScript
104 lines
3.0 KiB
JavaScript
const common = require('../../lib/common');
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const {extract, hasProvider} = require('oembed-parser');
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const Promise = require('bluebird');
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const request = require('../../lib/request');
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const cheerio = require('cheerio');
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const findUrlWithProvider = (url) => {
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let provider;
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// build up a list of URL variations to test against because the oembed
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// providers list is not always up to date with scheme or www vs non-www
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let baseUrl = url.replace(/^\/\/|^https?:\/\/(?:www\.)?/, '');
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let testUrls = [
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`http://${baseUrl}`,
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`https://${baseUrl}`,
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`http://www.${baseUrl}`,
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`https://www.${baseUrl}`
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];
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for (let testUrl of testUrls) {
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provider = hasProvider(testUrl);
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if (provider) {
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url = testUrl;
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break;
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}
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}
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return {url, provider};
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};
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const getOembedUrlFromHTML = (html) => {
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return cheerio('link[type="application/json+oembed"]', html).attr('href');
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};
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module.exports = {
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docName: 'oembed',
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read: {
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permissions: false,
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data: [
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'url'
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],
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options: [],
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query({data}) {
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let {url} = data;
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if (!url || !url.trim()) {
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return Promise.reject(new common.errors.BadRequestError({
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message: common.i18n.t('errors.api.oembed.noUrlProvided')
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}));
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}
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function unknownProvider() {
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return Promise.reject(new common.errors.ValidationError({
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message: common.i18n.t('errors.api.oembed.unknownProvider'),
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context: url
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}));
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}
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function knownProvider(url) {
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return extract(url).catch((err) => {
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return Promise.reject(new common.errors.InternalServerError({
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message: err.message
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}));
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});
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}
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let provider;
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({url, provider} = findUrlWithProvider(url));
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if (provider) {
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return knownProvider(url);
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}
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// see if the URL is a redirect to cater for shortened urls
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return request(url, {
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method: 'GET',
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timeout: 2 * 1000,
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followRedirect: true
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}).then((response) => {
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if (response.url !== url) {
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({url, provider} = findUrlWithProvider(response.url));
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return provider ? knownProvider(url) : unknownProvider();
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}
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const oembedUrl = getOembedUrlFromHTML(response.body);
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if (!oembedUrl) {
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return unknownProvider();
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}
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return request(oembedUrl, {
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method: 'GET',
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json: true
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}).then((response) => {
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return response.body;
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});
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}).catch(() => {
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return unknownProvider();
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});
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}
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}
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};
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