pf_video_embed.user.js

// ==UserScript==
// @name         ProgrammersForumVideoEmbed
// @namespace    http://programmersforum.ru/
// @version      0.52
// @description  replaces youtube and coub links with embedded video player frames
// @author       Alex P
// @include      *programmersforum.ru/*
// @require      https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js
// @grant        none
// @downloadURL  https://github.com/AlexP11223/ProgForumRuUserscripts/raw/master/pf_video_embed.user.js
// ==/UserScript==

(function() {
    'use strict';

    if (window.videoEmbedInitialized)
        return;
    window.videoEmbedInitialized = true;

    var YOUTUBE_EMBED_TEMPLATE = '<iframe src="https://www.youtube.com/embed/_ID_" width="560" height="315" frameborder="0" allowfullscreen></iframe>';
    var COUB_EMBED_TEMPLATE = '<iframe src="//coub.com/embed/_ID_?muted=false&autostart=false&originalSize=false&startWithHD=true" width="640" height="270" frameborder="0" allowfullscreen></iframe>';

    function insertEmbed(origLinkNode, embedTemplate, id) {
        var html = '<br/>' + embedTemplate.replace('_ID_', id) + '<br/>';

        $(html).insertAfter(origLinkNode);
        origLinkNode.addClass('_embedded');
    }

    function parseURL(url) {
        var parser = document.createElement('a');
        var searchDict = {};

        parser.href = url;

        var queries = parser.search.replace(/^\?/, '').split('&');
        var i;
        for (i = 0; i < queries.length; i++) {
            var parts = queries[i].split('=');
            searchDict[parts[0]] = parts[1];
        }

        return {
            protocol: parser.protocol,
            host: parser.host,
            hostname: parser.hostname,
            port: parser.port,
            pathname: parser.pathname,
            search: parser.search,
            hash: parser.hash,
            searchDict: searchDict,
            pathParts: parser.pathname.substring(1).split('/')
        };
    }

    function containsAny(str, substrings) {
        for (var i = 0; i != substrings.length; i++) {
            var substring = substrings[i];
            if (str.indexOf(substring) != -1) {
                return true;
            }
        }
        return false;
    }

    function parseYoutube(href) {
        function parseId(url) {
            if (url.hostname.indexOf('youtu.be') != -1)
                return url.pathParts[0];

            if (url.searchDict['v'])
                return url.searchDict['v'];

            if (['watch', 'embed', 'v'].indexOf(url.pathParts[0]) != -1)
                return url.pathParts[1];

            return false;
        }

        function parseTime(s) {
            try {
                var parts = s.replace(/[^0-9]+/g, ' ').split(' ');
                parts = $.grep(parts, function(el) { return el !== '';});

                if (parts.length === 1) {
                    return parseInt(parts[0], 10);
                } else if (parts.length === 2) {
                    return parseInt(parts[0], 10) * 60 + parseInt(parts[1], 10);
                } else if (parts.length === 3) {
                    return parseInt(parts[0], 10) * 3600 + parseInt(parts[1], 10) * 60 + parseInt(parts[2], 10);
                }
            } catch (e) {
            }
            return 0;
        }

        var url = parseURL(href);

        var domains = ['youtube.com', 'youtu.be'];

        if (!containsAny(url.hostname, domains))
            return false;

        var id = parseId(url);

        if (id) {
            var ret = { id: id, params: { } };

            if (url.searchDict['t']) {
                var t = parseTime(url.searchDict['t']);
                if (t) {
                    ret.params.start = t;
                }
            }

            return ret;
        }

        return false;
    }

    function parseCoubId(href) {
        var url = parseURL(href);

        var domains = ['coub.com'];

        if (!containsAny(url.hostname, domains))
            return false;

        if (['view', 'embed'].indexOf(url.pathParts[0]) != -1)
            return url.pathParts[1];

        return false;
    }

    var postBlocks = $('#posts, #post, td.alt1:has(hr)');

    $.each(postBlocks.find('a[href*="youtu"], a[href*="coub"]'), function (i, link) {
        if (!$(link).is(':visible') || $(link).is('._embedded'))
            return;

        // skip signature
        if ($(link).parents('div').eq(0).is(':contains("__________________")'))
            return;

        var url = $(link).attr('href');

        var youtube = parseYoutube(url);
        if (youtube) {
            var paramsStr = '';
            if (!$.isEmptyObject(youtube.params)) {
                paramsStr = '?' + $.param(youtube.params);
            }
            insertEmbed($(link), YOUTUBE_EMBED_TEMPLATE, youtube.id + paramsStr);
        }

        var coubId = parseCoubId(url);
        if (coubId) {
            insertEmbed($(link), COUB_EMBED_TEMPLATE, coubId);
        }
    });
})();