91 lines
2.3 KiB
JavaScript
91 lines
2.3 KiB
JavaScript
/**
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* Get video ID.
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*
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* There are a few type of video URL formats.
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* - https://www.youtube.com/watch?v=VIDEO_ID
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* - https://m.youtube.com/watch?v=VIDEO_ID
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* - https://youtu.be/VIDEO_ID
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* - https://www.youtube.com/v/VIDEO_ID
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* - https://www.youtube.com/embed/VIDEO_ID
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* - https://music.youtube.com/watch?v=VIDEO_ID
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* - https://gaming.youtube.com/watch?v=VIDEO_ID
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*
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* @param {string} link
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* @return {string}
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* @throws {Error} If unable to find a id
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* @throws {TypeError} If videoid doesn't match specs
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*/
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const validQueryDomains = new Set([
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'youtube.com',
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'www.youtube.com',
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'm.youtube.com',
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'music.youtube.com',
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'gaming.youtube.com',
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]);
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const validPathDomains = /^https?:\/\/(youtu\.be\/|(www\.)?youtube\.com\/(embed|v|shorts)\/)/;
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exports.getURLVideoID = link => {
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const parsed = new URL(link);
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let id = parsed.searchParams.get('v');
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if (validPathDomains.test(link) && !id) {
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const paths = parsed.pathname.split('/');
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id = parsed.host === 'youtu.be' ? paths[1] : paths[2];
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} else if (parsed.hostname && !validQueryDomains.has(parsed.hostname)) {
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throw Error('Not a YouTube domain');
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}
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if (!id) {
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throw Error(`No video id found: ${link}`);
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}
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id = id.substring(0, 11);
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if (!exports.validateID(id)) {
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throw TypeError(`Video id (${id}) does not match expected ` +
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`format (${idRegex.toString()})`);
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}
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return id;
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};
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/**
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* Gets video ID either from a url or by checking if the given string
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* matches the video ID format.
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*
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* @param {string} str
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* @returns {string}
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* @throws {Error} If unable to find a id
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* @throws {TypeError} If videoid doesn't match specs
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*/
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const urlRegex = /^https?:\/\//;
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exports.getVideoID = str => {
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if (exports.validateID(str)) {
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return str;
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} else if (urlRegex.test(str)) {
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return exports.getURLVideoID(str);
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} else {
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throw Error(`No video id found: ${str}`);
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}
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};
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/**
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* Returns true if given id satifies YouTube's id format.
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*
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* @param {string} id
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* @return {boolean}
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*/
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const idRegex = /^[a-zA-Z0-9-_]{11}$/;
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exports.validateID = id => idRegex.test(id);
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/**
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* Checks wether the input string includes a valid id.
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*
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* @param {string} string
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* @returns {boolean}
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*/
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exports.validateURL = string => {
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try {
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exports.getURLVideoID(string);
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return true;
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} catch (e) {
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return false;
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}
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};
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