First full commit of plugin system

doc/Plugin_System.md

@@ -0,0 +1,61 @@
+# Developing for the Plugin System
+
+This documentation will hopefully give you a basis for how to write a plugin for LibreNMS.
+
+A test plugin is available on GitHib: https://github.com/laf/Test
+
+Plugins need to be installed into html/plugins
+
+The structure of a plugin is follows:
+
+```
+html/plugins
+            /PluginName
+                       /PluginName.php
+                       /PluginName.inc.php
+```
+
+The above structure is checked before a plugin can be installed.
+
+All files / folder names are case sensitive and must match.
+
+PluginName - This is a directory and needs to be named as per the plugin you are creating.
+
+PluginName.php - This file is used to process calls into the plugin from the main LibreNMS install.
+                 Here only functions within the class for your plugin that LibreNMS calls will be executed.
+                 For a list of currently enabled system hooks, please see further down.
+                 The minimum code required in this file is (replace Test with the name of your plugin):
+```
+<?php
+
+class Test {
+}
+
+?>
+```
+
+PluginName.inc.php - This file is the main included file when browsing to the plugin itself.
+                     You can use this to display / edit / remove whatever you like.
+                     The minimum code required in this file is:
+```
+<?php
+
+?>
+```
+
+### System Hooks ###
+
+System hooks are called as functions within your plugin class, so for example to create a menu entry within the PLugin dropdown you would do:
+
+```
+  public function menu() {
+    echo('<li><a href="plugin/p='.get_class().'">'.get_class().'</a></li>');
+  }
+```
+
+This would then add the name and a link to your plugin.
+
+The following system hooks are currently available:
+
+menu()
+* This is called to build the plugin menu system and you can use this to link to your plugin (you don't have to).

html/includes/plugins.inc.php

@@ -0,0 +1,68 @@
+<?php
+
+class Plugins
+{
+  private static $plugins = array();
+
+  public static function start()
+  {
+    global $config;
+    if(file_exists($config['plugin_dir']))
+    {
+      //$plugin_files = scandir($config['plugin_dir']);
+      $plugin_files = dbFetchRows("SELECT * FROM `plugins` WHERE `plugin_active` = '1'");
+      foreach($plugin_files as $plugins)
+      {
+        $plugin_info = pathinfo($config['plugin_dir'].'/'.$plugins['plugin_name'].'/'.$plugins['plugin_name'].'.php');
+        if($plugin_info['extension'] == 'php')
+        {
+          if(is_file($config['plugin_dir'].'/'.$plugins['plugin_name'].'/'.$plugins['plugin_name'].'.php'))
+          {
+            self::load($config['plugin_dir'].'/'.$plugins['plugin_name'].'/'.$plugins['plugin_name'].'.php', $plugin_info['filename']);
+          }
+        }
+      }
+      return true;
+    }
+    else
+    {
+      return false;
+    }
+  }
+
+  public static function load($file, $pluginName)
+  {
+    include($file);
+    $plugin = new $pluginName;
+    $hooks = get_class_methods($plugin);
+    
+    foreach($hooks as $hookName)
+    {
+      if($hookName{0} != '_')
+      {
+        self::$plugins[$hookName][] = $pluginName;
+      }
+    }
+    return $plugin;
+  }
+
+  public static function call($hook, $params=false)
+  {
+    if(count(self::$plugins[$hook]) != 0)
+    {
+      foreach(self::$plugins[$hook] as $name)
+      {
+        if(!is_array($params))
+        {
+          call_user_func(array($name, $hook));
+        }
+        else
+        {
+          call_user_func_array(array($name, $hook), $params);
+        }
+      }
+    }
+  }
+}
+
+?>

html/includes/print-menubar.php

@@ -484,15 +484,19 @@ if(is_file("includes/print-menubar-custom.inc.php"))
           </form>
         </li>
         <li class="dropdown">
+          <a href="#" class="dropdown-toggle" data-hover="dropdown" data-toggle="dropdown"> Plugins<b class="caret"></b></a>
+          <ul class="dropdown-menu">
 <?php
-if($_SESSION['widescreen'] === 1)
-{
-  echo('        <a href="' . $toggle_url . 'widescreen=no" title="Switch to normal screen width layout">Normal width</a>');
-} else {
-  echo('        <a href="' . $toggle_url . 'widescreen=yes" title="Switch to wide screen layout">Widescreen</a>');
-}
-
+Plugins::call('menu');
 ?>
+            <li role="presentation" class="divider"></li>
+<?php
+if ($_SESSION['userlevel'] >= '10')
+{
+  echo('            <li><a href="plugin/view=admin">Plugin Admin</a></li>');
+}
+?>
+          </ul>
         </li>
       <li class="dropdown">
         <a href="#" class="dropdown-toggle" data-hover="dropdown" data-toggle="dropdown"><img src="images/16/wrench.png" border="0" align="absmiddle" /> System<b class="caret"></b></a>

html/index.php

@@ -17,6 +17,8 @@ include("../config.php");
 include_once("../includes/definitions.inc.php");
 include("../includes/functions.php");
 include("includes/functions.inc.php");
+include('includes/plugins.inc.php');
+Plugins::start();
 
 // Check for install.inc.php
 if (!file_exists('../config.php') && $_SERVER['PATH_INFO'] != '/install.php') {

html/pages/plugin.inc.php

@@ -0,0 +1,20 @@
+<?php
+
+$link_array = array('page'    => 'plugin');
+
+$pagetitle[] = "Plugin";
+
+if ($vars['view'] == "admin")
+{
+  include_once('pages/plugin/admin.inc.php');
+}
+else
+{
+  $plugin = dbFetchRow("SELECT `plugin_name` FROM `plugins` WHERE `plugin_name` = '".$vars['p']."'");
+  if(!empty($plugin))
+  {
+    require('plugins/'.$plugin['plugin_name'].'/'.$plugin['plugin_name'].'.inc.php');
+  }
+}
+
+?>

html/pages/plugin/admin.inc.php

@@ -0,0 +1,95 @@
+<?php
+
+if ($_SESSION['userlevel'] >= '10')
+{
+  
+  // Scan for new plugins and add to the database
+  $new_plugins = scan_new_plugins();
+
+
+  // Check if we have to toggle enabled / disable a particular module
+  $plugin_id = $_POST['plugin_id'];
+  $plugin_active = $_POST['plugin_active'];
+  if(is_numeric($plugin_id) && is_numeric($plugin_active))
+  {
+    if( $plugin_active == '0')
+    {
+      $plugin_active = 1;
+    }
+    elseif( $plugin_active == '1')
+    {
+      $plugin_active = 0;
+    }
+    else
+    {
+      $plugin_active = 0;
+    }
+
+    dbUpdate(array('plugin_active' => $plugin_active), 'plugins', '`plugin_id` = ?', array($plugin_id));
+
+  }
+
+?>
+
+<div class="panel panel-default panel-condensed">
+  <div class="panel-heading">
+    <strong>System plugins</strong>
+  </div>
+<?php
+  if($new_plugins > 0)
+  {
+    echo('<div class="panel-body">
+    <div class="alert alert-warning">
+      We have found ' . $new_plugins . ' new plugins that need to be configured and enabled
+    </div>
+  </div>');
+  }
+?>
+  <table class="table table-condensed">
+    <tr>
+      <th>Name</th>
+      <th>Action</th>
+    </tr>
+
+<?php
+
+  foreach (dbFetchRows("SELECT * FROM plugins") as $plugins)
+  {
+    if($plugins['plugin_active'] == 1)
+    {
+      $plugin_colour = 'bg-success';
+      $plugin_button = 'danger';
+      $plugin_label = 'Disable';
+    }
+    else
+    {
+      $plugin_colour = 'bg-danger';
+      $plugin_button = 'success';
+      $plugin_label = 'Enable';
+    }
+    echo('<tr class="'. $plugin_colour .'">
+            <td>
+              '. $plugins['plugin_name'] . '
+            </td>
+            <td>
+              <form class="form-inline" role="form" action="" method="post" id="'.$plugins['plugin_id'].'" name=="'.$plugins['plugin_id'].'">
+                <input type="hidden" name="plugin_id" value="'.$plugins['plugin_id'].'">
+                <input type="hidden" name="plugin_active" value="'.$plugins['plugin_active'].'">
+                <button type="submit" class="btn btn-sm btn-'.$plugin_button.'">'.$plugin_label.'</button>
+              </form>
+            </td>
+          </tr>');
+  }
+
+?>
+  </table>
+</div>
+
+<?php
+}
+else
+{
+  include("includes/error-no-perm.inc.php");
+}
+
+?>

html/plugins/.gitignore

@@ -0,0 +1,2 @@
+*
+!.gitignore

includes/definitions.inc.php

@@ -1218,5 +1218,6 @@ if (!isset($config['html_dir'])) { $config['html_dir'] = $config['install_dir']
 if (!isset($config['rrd_dir']))  { $config['rrd_dir']  = $config['install_dir'] . '/rrd'; }
 if (!isset($config['log_dir']))  { $config['log_dir']  = $config['install_dir'] . '/logs'; }
 if (!isset($config['log_file'])) { $config['log_dir'] . "/" . $config['project_id'] . ".log"; }
+if (!isset($config['plugin_dir']))  { $config['plugin_dir']  = $config['html_dir'] . '/plugins'; }
 
 ?>

includes/functions.php

@@ -876,4 +876,40 @@ function is_port_valid($port, $device)
   return $valid;
 }
 
+function scan_new_plugins()
+{
+
+  global $config, $debug;
+
+  $installed = 0; // Track how many plugins we install.
+
+  if(file_exists($config['plugin_dir']))
+  {
+    $plugin_files = scandir($config['plugin_dir']);
+    foreach($plugin_files as $name)
+    {
+      if(is_dir($config['plugin_dir'].'/'.$name))
+      {
+        if($name != '.' && $name != '..')
+        {
+          if(is_file($config['plugin_dir'].'/'.$name.'/'.$name.'.php') && is_file($config['plugin_dir'].'/'.$name.'/'.$name.'.inc.php'))
+          {
+            $plugin_id = dbFetchRow("SELECT `plugin_id` FROM `plugins` WHERE `plugin_name` = '$name'");
+            if(empty($plugin_id))
+            {
+              if(dbInsert(array('plugin_name' => $name, 'plugin_active' => '0'), 'plugins'))
+              {
+                $installed++;
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+
+  return( $installed );
+
+}
+
 ?>

sql-schema/030.sql

@@ -0,0 +1 @@
+CREATE TABLE IF NOT EXISTS `plugins` ( `plugin_id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY , `plugin_name` VARCHAR( 60 ) NOT NULL , `plugin_active` INT NOT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1;