Allows plugin to set a return link in navlinks

In some page (display, sql, ...), a "return" link will show up if
$_GET['return'] = 'plugin' is given. The "get_subject_params" method of
the plugin designated by $_GET['plugin'] is then called to add needed
parameters in the href URL.

3 files changed, 42 insertions, 10 deletions

diff --git a/classes/Misc.php b/classes/Misc.php
index af77676e..d26a45eb 100644
--- a/classes/Misc.php
+++ b/classes/Misc.php
@@ -50,6 +50,8 @@
 		}
 
 		function getSubjectParams($subject) {
+			global $plugin_manager;
+
 			$vars = array();
 
 			switch($subject) {
@@ -171,16 +173,18 @@
 							'column' => $_REQUEST['column']
 						));
 					break;
-                               // case 'plugin':
-                               //      $vars = array('params' => array(
-                               //              'server' => $_REQUEST['server'],
-                               //              'subject' => 'plugin',
-                               //              'plugin' => $_REQUEST['plugin'],
-                               //              'database' => $_REQUEST['database'],
-                               //              'schema' => $_REQUEST['schema'],
-                               //              'action' => $_REQUEST['action']
-                               //      ));
-                               //      break;
+				case 'plugin':
+					$vars = array(
+						'url' => 'plugin.php',
+						'params' => array(
+							'server' => $_REQUEST['server'],
+							'subject' => 'plugin',
+							'plugin' => $_REQUEST['plugin'],
+					));
+
+					if (!is_null($plugin_manager->getPlugin($_REQUEST['plugin'])))
+						$vars['params'] = array_merge($vars['params'], $plugin_manager->getPlugin($_REQUEST['plugin'])->get_subject_params());
+					break;
 				default:
 					return false;
 			}
diff --git a/classes/Plugin.php b/classes/Plugin.php
index 5806d311..e3bea046 100644
--- a/classes/Plugin.php
+++ b/classes/Plugin.php
@@ -33,6 +33,21 @@ abstract class Plugin {
 	abstract function get_actions();
 
 	/**
+	 * In some page (display, sql, ...), a "return" link will show up if
+	 * $_GET['return'] = 'plugin' is given. The "get_subject_params" method
+	 * of the plugin designated by $_GET['plugin'] is then called to add needed
+	 * parameters in the href URL.
+	 * This method can returns parameters based on context from $_REQUEST. See
+	 * plugin Report as example.
+	 *
+	 * @returns an associative of parameter_name => value
+	 */
+	function get_subject_params() {
+		$vars = array();
+		return $vars;
+	}
+
+	/**
 	 * Get the plugin name, that will be used as identification
 	 * @return $name
 	 */
@@ -40,6 +55,12 @@ abstract class Plugin {
 		return $this->name;
 	}
 
+	/**
+	 * Returns the structure suitable for the method $misc->icon() to print
+	 * the given icon.
+	 * @param $img - The icon name
+	 * @return the information suitable for the method $misc->icon()
+	 */
 	function icon($img) {
 		return array($this->name, $img);
 	}
diff --git a/classes/PluginManager.php b/classes/PluginManager.php
index 1f01390f..3bc1eb39 100644
--- a/classes/PluginManager.php
+++ b/classes/PluginManager.php
@@ -74,6 +74,13 @@ class PluginManager {
 		$this->actions[$plugin_name] = $actions;
 	}
 
+	function getPlugin($plugin) {
+		if (isset($this->plugins_list[$plugin]))
+			return $this->plugins_list[$plugin];
+
+		return null;
+	}
+
 	/**
 	 * Execute the plugins hook functions when needed.
 	 * @param $hook - The place where the function will be called