video-thumbnail-url/src/index.js

get thumbnail url from video url

import {parse} from 'url';
import bluebird from 'bluebird';
import rp from 'request-promise';

//extract id from url path
const RE_VIMEO = /^(?:\/video|\/channels\/[\w-]+|\/groups\/[\w-]+\/videos)?\/(\d+)$/;
const RE_YOUTUBE = /^(?:\/embed)?\/([\w-]{10,12})$/;
const RE_FACEBOOK = /^\/[\w-]+\/videos\/(\d+)(\/)?$/;

export default function getThumbnailURL(url) {
    return bluebird.try(() => {
        url = url || '';

        const urlobj = parse(url, true);
        
        //youtube
        if (['www.youtube.com', 'youtube.com', 'youtu.be'].indexOf(urlobj.host) !== -1) {
            let video_id = null;
            if ('v' in urlobj.query) {
                if (urlobj.query.v && urlobj.query.v.match(/^[\w-]{10,12}$/)) {
                    video_id = urlobj.query.v;
                }
            } else {
                const match = RE_YOUTUBE.exec(urlobj.pathname);
                if (match) {
                    video_id = match[1];
                }
            }

            if (video_id) {
                return  `http://img.youtube.com/vi/${video_id}/hqdefault.jpg`;
            }
        }

        //vimeo
        if (['www.vimeo.com', 'vimeo.com', 'player.vimeo.com'].indexOf(urlobj.host) !== -1) {
            const match = RE_VIMEO.exec(urlobj.pathname);
            if (match) {
                const video_id = match[1];
                return rp({
                    uri: `https://vimeo.com/api/v2/video/${video_id}.json`,
                    json: true
                })
                .then(data => {
                    if (data) {
                        return data[0].thumbnail_large;
                    }
                }); 
            }
        }

        //facebook
        if (['facebook.com', 'www.facebook.com'].indexOf(urlobj.host) !== -1) {
            const match = RE_FACEBOOK.exec(urlobj.pathname);
            
            if (match) {
                const video_id = match[1];
                return rp({
                    uri: `https://graph.facebook.com/${video_id}`,
                    json: true
                })
                .then(data => {
                    if (data) {
                        return data.picture
                    }
                });
            }
        }
        return null;
    });
}