support showing album-cover on windows lockscreen

copyparty/web/browser.js

@@ -320,6 +320,11 @@ var mpl = (function () {
 
 			if (cover) {
 				cover += (cover.indexOf('?') === -1 ? '?' : '&') + 'th=j';
+
+				var pwd = get_pwd();
+				if (pwd)
+					cover += '&pw=' + uricom_enc(pwd);
+
 				tags.artwork = [{ "src": cover, type: "image/jpeg" }];
 			}
 		}

copyparty/web/util.js

@@ -359,6 +359,15 @@ function get_vpath() {
 }
 
 
+function get_pwd() {
+	var pwd = ('; ' + document.cookie).split('; cppwd=');
+	if (pwd.length < 2)
+		return null;
+
+	return pwd[1].split(';')[0];
+}
+
+
 function unix2iso(ts) {
     return new Date(ts * 1000).toISOString().replace("T", " ").slice(0, -5);
 }