Fixed Broken Shit

user/plugins/custom-protocols/plugin.php

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+<?php
+/*
+Plugin Name: Custom Protocols
+Plugin URI: http://yourls.org/
+Description: Add custom protocol <code>blah://</code> for trusted users, blacklist all but <code>http</code> and <code>https</code> for others
+Version: 1.0
+Author: Ozh
+Author URI: http://ozh.org/
+*/
+
+// Hook into 'kses_allowed_protocols' to modify array. See functions-kses.php/yourls_kses_init()
+yourls_add_filter( 'kses_allowed_protocols', 'customproto_allowed_protocols' );
+
+// Whitelist or blacklist protocols depending on user context
+function customproto_allowed_protocols( $protocols ) {
+
+	if( yourls_is_valid_user() && yourls_is_admin() ) {
+		// if user is logged in, or valid cookie exists on the computer, and we're in admin area:
+		// add custom protocol 'blah://' to authorized protocols
+		$protocols[] = 'blah://';
+	} else {
+		// if no known user: remove all protocols except http & https
+		$protocols = array( 'http://', 'https://' );
+	}
+
+	return $protocols;
+}
+

user/plugins/custom-protocols/readme.md

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+Plugin for YOURLS 1.6+: Custom Protocols
+
+# What for
+
+If the user is known, this plugin adds custom protocol `blah://` to authorized protocols.
+
+If the user is unknown (using a public interface for instance) then this plugin restricts
+authorized protocols to `http` and `https` only.
+
+See [Public Shortening](https://github.com/YOURLS/YOURLS/wiki/Public-Shortening).
+
+# How to
+
+* In `/user/plugins`, create a new folder named `custom-protocols`
+* Drop these files in that directory
+* Go to the Plugins administration page and activate the plugin 
+* Have fun
+