Enhance share feature with modal dialog choices

Add Facebook / Twitter / GooglePlus external share plugins

modules/plugins/GooglePlus.plugin.php

@@ -0,0 +1,88 @@
+<?php
+/* vim:set softtabstop=4 shiftwidth=4 expandtab: */
+/**
+ *
+ * LICENSE: GNU General Public License, version 2 (GPLv2)
+ * Copyright 2001 - 2014 Ampache.org
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License v2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ */
+
+class AmpacheGooglePlus {
+    
+    public $name        = 'GooglePlus';
+    public $categories  = 'share';
+    public $description = 'Google+ Share';
+    public $url         = 'https://plus.google.com';
+    public $version     = '000001';
+    public $min_ampache = '370027';
+    public $max_ampache = '999999';
+    
+    /**
+     * Constructor
+     * This function does nothing...
+     */
+    public function __construct() {
+
+        return true;
+
+    } // constructor
+
+    /**
+     * install
+     * This is a required plugin function. It inserts our preferences
+     * into Ampache
+     */
+    public function install() {
+        return true;
+    } // install
+
+    /**
+     * uninstall
+     * This is a required plugin function. It removes our preferences from
+     * the database returning it to its original form
+     */
+    public function uninstall() {
+        return true;
+    } // uninstall
+
+    /**
+     * upgrade
+     * This is a recommended plugin function
+     */
+    public function upgrade() {
+        return true;
+    } // upgrade
+
+    public function external_share($url, $text)
+    {
+        $share = "https://plus.google.com/share";
+        $share .= "?url=" . rawurlencode($url);
+        
+        return $share;
+    }
+    
+    /**
+     * load
+     * This loads up the data we need into this object, this stuff comes 
+     * from the preferences.
+     */
+    public function load($user) {
+        $user->set_preferences();
+        $data = $user->prefs;
+        
+        return true;
+    } // load
+}