MusicBrainz Subscriptions

By murdos — Last update Jun 13, 2008 — Installed 327 times.

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// ==UserScript==
// @name           MusicBrainz Subscriptions
// @description    Highlight the artists or labels for which you are subscribed, changes the "Subscribe" link to "Unsubscribe" and  appends a "View subscriptions" link.
// @version        2008-06-12_01
// @author         Aurelien Mino <aurelien.mino@gmail.com> & contributions by jesus2099 (http://jesus2099.ions.fr/)
// @licence        GPL (http://www.gnu.org/copyleft/gpl.html)
//
// @include        http://*musicbrainz.org/artist/*
// @include        http://*musicbrainz.org/show/artist/*
// @include        http://*musicbrainz.org/release/*
// @include        http://*musicbrainz.org/show/release/*
// @include        http://*musicbrainz.org/album/*
// @include        http://*musicbrainz.org/show/album/*
// @include        http://*musicbrainz.org/label/*
// @include        http://*musicbrainz.org/show/label/*

// ==/UserScript==

(function () {

// Script Update Checker
// -- http://userscripts.org/scripts/show/20145
var version_scriptNum = 8266; // Change this to the number given to the script by userscripts.org (check the address bar)
var version_timestamp = 1213393833106; // Used to differentiate one version of the script from an older one. Use the Date.getTime() function to get a value for this.
try {
function updateCheck(forced) {if((forced)||(parseInt(GM_getValue("lastUpdate", "0")) + 86400000 <= (new Date().getTime()))) {try {GM_xmlhttpRequest({method: "GET",url: "http://userscripts.org/scripts/review/" + version_scriptNum + "?" + new Date().getTime(),headers: {'Cache-Control': 'no-cache'},onload: function(xhrResponse) {GM_setValue("lastUpdate", new Date().getTime() + ""); var rt = xhrResponse.responseText.replace(/&nbsp;?/gm, " ").replace(/<li>/gm, "\n").replace(/<[^>]*>/gm, ""); var scriptName = (/@name\s*(.*?)\s*$/m.exec(rt))[1]; GM_setValue("targetScriptName", scriptName); if (parseInt(/version_timestamp\s*=\s*([0-9]+)/.exec(rt)[1]) > version_timestamp) {if (confirm("There is an update available for the Greasemonkey script \"" + scriptName + ".\"\nWould you like to go to the install page now?")) {GM_openInTab("http://userscripts.org/scripts/show/" + version_scriptNum);}} else if (forced) {alert("No update is available for \"" + scriptName + ".\"");}}});} catch (err) {if (forced) {alert("An error occurred while checking for updates:\n" + err);}}}} GM_registerMenuCommand(GM_getValue("targetScriptName", "???") + " - Manual Update Check", function() {updateCheck(true);}); updateCheck(false);
} catch(e) {}

// Get subscriptionType (label or artist)
var subscriptionType = undefined;
if (window.location.href.match(/artist/) || window.location.href.match(/release/)) {
	subscriptionType = 'artist';
} else if (window.location.href.match(/label/)) {
	subscriptionType = 'label';
}

// Get editor name
var editorName = getEditorName();

// Load subscriptions page
if (subscriptionType && editorName) {
	var url = 'http://' + window.location.host + '/show/' + subscriptionType + '/subscriptions.html?' + subscriptionType + '=' + getEntityId(subscriptionType);
	
	var xmlhttp = new XMLHttpRequest();
	xmlhttp.onreadystatechange = xmlhttpChange;
	xmlhttp.open("GET", url, true);
	xmlhttp.overrideMimeType('text/xml');
	xmlhttp.send(null);
}

// Analyze XmlHttp response
function xmlhttpChange() {

	// create XMLDOM object if xmlhttp shows "loaded"
    if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
	{
	
		var xmldoc = xmlhttp.responseXML;

        var xpathExpr = "count(//xhtml:td[@id='content-td']//xhtml:a[contains(text(), '" + editorName + "')])>0";
		var isSubscribed = xmldoc.evaluate(xpathExpr, xmldoc, NSResolver, XPathResult.BOOLEAN_TYPE, null).booleanValue;
	
		if(isSubscribed) {
			subscriptionDecorator();
		} else {
			subscriptionsLink();
		}
	}		
}

// Function which does page change if the editor is subscribed
function subscriptionDecorator() {
	// Highlight label/artist name
	var artistTitle = getElementsByClassName(document, 'td', 'title')[0].getElementsByTagName('a')[0];
	artistTitle.style.borderBottom = "red dotted 2px";
	
	// Change 'Subscribe' to 'Unsubscribe'
	var artistbox = getElementsByClassName(document, "td", (subscriptionType == "artist" ? "editlinks": "links"))[0];
	var subscribeLink = artistbox.getElementsByTagName("a")[2];
	subscribeLink.href += '&unsubscribe=1';
	subscribeLink.replaceChild(document.createTextNode('Unsubscribe'), subscribeLink.firstChild);
	
	// Insert the new link "View subscriptions"
	subscriptionsLink(subscribeLink);
}

// Function which adds the Subscriptions link
function subscriptionsLink(subscribeLink) {
	// If subscribeLink is null or not provided, redefine it (the expresssion refers to the definition of artistbox & subscribeLink in function subscriptionDecorator())
	var subscribeLink = (subscribeLink == null) ? getElementsByClassName(document, "td", (subscriptionType == "artist" ? "editlinks": "links"))[0].getElementsByTagName("a")[2] : subscribeLink;
	
	var newlink = document.createElement("a");
	newlink.href = url;
	newlink.appendChild(document.createTextNode("View subscriptions"));
	
	var fragment= document.createDocumentFragment();
	fragment.appendChild(document.createTextNode(" ("));
	fragment.appendChild(newlink);
	fragment.appendChild(document.createTextNode(") "));
	
	subscribeLink.parentNode.insertBefore(fragment, subscribeLink.nextSibling);
}

// Obtain the connected editor name
function getEditorName() {
	var link = document.getElementById('sidebar-td').getElementsByTagName('div')[3].getElementsByTagName('a')[0];
	var username = link.firstChild.nodeValue;
	return username;
}

// Obtain the artistId of the current page
function getEntityId(subscriptionType) {
	var artistbox = getElementsByClassName(document, "td", "links")[0];
	var link = artistbox.getElementsByTagName("a")[1];
	var re = new RegExp('details.html\\?' + subscriptionType + 'id=(.+)');
	var entity_id = re.exec(link.href)[1];
	return entity_id;
}

// Helper function for getting html element by class name
// Written by Jonathan Snook, http://www.snook.ca/jonathan
// Add-ons by Robert Nyman, http://www.robertnyman.com
function getElementsByClassName(oElm, strTagName, strClassName){
    var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
    var arrReturnElements = new Array();
    strClassName = strClassName.replace(/\-/g, "\\-");
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    var oElement;
    for(var i=0; i<arrElements.length; i++){
        oElement = arrElements[i];      
        if(oRegExp.test(oElement.className)){
            arrReturnElements.push(oElement);
        }   
    }
    return (arrReturnElements);
}


// Helper function needed for resolving namespaces in xpath expression
function NSResolver(prefix) {
  var ns = {
    'xhtml' : 'http://www.w3.org/1999/xhtml'
  };
  return ns[prefix] || null;
}

})();