Spotify Links On iTunes

Add a Spotify link and embedded player on iTunes album/artist pages
当前为 2017-06-08 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name           Spotify Links On iTunes
// @description    Add a Spotify link and embedded player on iTunes album/artist pages
// @author         mirka
// @include        https://itunes.apple.com/*/artist/*
// @include        https://itunes.apple.com/artist/*
// @include        https://itunes.apple.com/*/album/*
// @include        https://itunes.apple.com/album/*
// @namespace      http://jaguchi.com
// @require        https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js
// @version        3.0
// ==/UserScript==

(function () {

	/*=========================================
		 User preferences
	===========================================*/

	// Set this to false if you want the Spotify link to open in the Web Player
	var open_in_app = true;

	// Set this to false if you don't want an embedded Spotify player (album pages only)
	var embed_player = true;
	
	/*=========================================
		 Link insertion handlers
	===========================================*/

	var insertLink = {
		album: function (uri) {
			var view_in_itunes_btn = $("div#left-stack a.action.view-in-itunes")[0];
			insertSpotifyLinkAfter(view_in_itunes_btn, uri);
			$("#spotify-btn").css({margin: "-4px 0 12px 0"});
		},
		artist: function (uri) {
			var view_in_itunes_btn = $("div#title a.action.view-in-itunes")[0];
			insertSpotifyLinkAfter(view_in_itunes_btn, uri);
		},
	};

	function insertSpotifyLinkAfter(target, uri) {
		var text = target.firstChild.textContent.replace("iTunes", "Spotify");
		var btn;
		var btn_css = {
				background: "linear-gradient(rgb(30, 215, 96), rgb(29, 185, 84))",
				backgroundColor: "rgb(41, 210, 100)",
				border: "1px solid rgb(21, 183, 68)",
				borderRadius: "15px",
				color: "#fff",
				display: "inline-block",
				fontSize: "95%",
				fontWeight: "bold",
				padding: "1px 8px",
				textAlign: "center",
				textDecoration: "none",
				verticalAlign: "text-bottom",
			};

		// Workaround for English locales where capitalization in the
		// span text doesn't match the button img
		if (text == "View In Spotify") {
			text = "View in Spotify";
		}

		$(target).after("<a href='" + uri + "' id='spotify-btn'>" + text + "</a>");
		btn = $("#spotify-btn")[0];
		$(btn).css(btn_css);

		if (!uri) {
			btn.textContent = "Not on Spotify";
			btn.removeAttribute("href");
			btn.style.background = "";
			btn.style.backgroundColor = "#ddd";
			btn.style.border = "none";
		}
	}

	function insertSpotifyPlayer(uri) {

		function collapseiTunesTracklist() {
			var itunes_tracklist = $("table.tracklist-table")[0];
			var expand_link = $("<a/>", {
				href: "#",
				text: "+ Expand iTunes tracklist",
				click: function (e) {
					e.preventDefault();
					$(itunes_tracklist).css({ display: "block", });
					$(expand_link).remove();
				},
				css: {
					display: "block",
					textAlign: "center",
				},
			});

			$(itunes_tracklist).before(expand_link);
			$(itunes_tracklist).css({ display: "none", });
		}

		var target = $("div.track-list")[0];
		var player = $("<iframe/>", {
			src: "https://embed.spotify.com/?uri=" + uri,
			width: "640",
			height: "720",
			frameborder: "0",
			allowtransparency: "true",
			css: {
				marginBottom: "2em",
			}
		});
		
		$(target).before(player);
		collapseiTunesTracklist();
	}

	/*=========================================
		 Spotify search handlers
	===========================================*/

	function searchAlbum(is_alt_query) {
		var album = $("h1[itemprop=name]")[0].textContent;
		var artist = $("h2[itemprop=name]")[0].textContent;
		var album_excludes = ["live", "remastered", "compilation", "original (motion picture )?soundtrack", "bonus track version", "(deluxe|exclusive|expanded|revised) (version|edition)", "(music|soundtrack) from the (motion picture|film score)", "feat\. .+"];
		var character_regex = /[:&,/()]/g;
		var album_regex;
		var query;

		if (is_alt_query) {
			album_regex = new RegExp("\\((" + album_excludes.join("|") + ")\\)", "ig");
			album = album.replace(album_regex, "");
			album = album.replace(/\[.+\]/, ""); // remove bracketed fragment
			album = album.replace(/(- (single|ep))$/i, "");
			album = album.replace(/(version|edition)\)/i, "");
			album = album.replace(character_regex, "");

			if (/,|&/.test(artist)) {
				artist = artist.match(/^(.+?)(,|&)/)[1]; // extract first fragment
			}
			artist = artist.replace(character_regex, "");
			query = album + " " + artist;
		} else {
			query = "album:\"" + album + "\"" + " artist:\"" + artist + "\"";
		}

		searchSpotify(query, "album", is_alt_query);
	}

	function searchArtist() {
		var artist = $("h1[itemprop=name]")[0].textContent;
		var query = "artist:\"" + artist + "\"";
		searchSpotify(query, "artist");
	}

	function searchSpotify(query, type, is_alt_query) { // type = "album" or "artist"
		var app_uri, external_uri;

		$.ajax({
			url: "https://api.spotify.com/v1/search",
			data: {
				q: query,
				type: type,
				limit: 1,
			},
			success: function (obj) {
				var match_count = obj[type + "s"].total;
				
				if (match_count == 0) {
					if (type == "album" && !is_alt_query) {
						searchAlbum(true); // try an alternative query
						return;
					}
				} else { // at least one match
					app_uri = obj[type + "s"].items[0].uri;
					external_uri = obj[type + "s"].items[0].external_urls.spotify;

					if (type == "album" && embed_player) {
						insertSpotifyPlayer(external_uri);
					}
				}

				insertLink[type](open_in_app ? app_uri : external_uri);
			}
		});
	}

	/*=========================================
		 Page type (album/artist) detection
	===========================================*/
	
	if ( /\/album\//.test(window.location.pathname) ) {
		searchAlbum();
	} else {
		searchArtist();
	}

})();
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