classes/pluginhost.php

   1 <?php
   2 class PluginHost {
   3         private $link;
   4         private $hooks = array();
   5         private $plugins = array();
   6         private $handlers = array();
   7         private $commands = array();
   8
   9         const HOOK_ARTICLE_BUTTON = 1;
  10         const HOOK_ARTICLE_FILTER = 2;
  11         const HOOK_PREFS_TAB = 3;
  12         const HOOK_PREFS_TAB_SECTION = 4;
  13         const HOOK_PREFS_TABS = 5;
  14         const HOOK_FEED_PARSED = 6;
  15         const HOOK_UPDATE_TASK = 7;
  16         const HOOK_AUTH_USER = 8;
  17
  18         const KIND_ALL = 1;
  19         const KIND_SYSTEM = 2;
  20         const KIND_USER = 3;
  21
  22         function __construct($link) {
  23                 $this->link = $link;
  24         }
  25
  26         private function register_plugin($name, $plugin) {
  27                 //array_push($this->plugins, $plugin);
  28                 $this->plugins[$name] = $plugin;
  29         }
  30
  31         function get_link() {
  32                 return $this->link;
  33         }
  34
  35         function get_plugins() {
  36                 return $this->plugins;
  37         }
  38
  39         function get_plugin($name) {
  40                 return $this->plugins[$name];
  41         }
  42
  43         function run_hooks($type, $method, $args) {
  44                 foreach ($this->get_hooks($type) as $hook) {
  45                         $hook->$method($args);
  46                 }
  47         }
  48
  49         function add_hook($type, $sender) {
  50                 if (!is_array($this->hooks[$type])) {
  51                         $this->hooks[$type] = array();
  52                 }
  53
  54                 array_push($this->hooks[$type], $sender);
  55         }
  56
  57         function del_hook($type, $sender) {
  58                 if (is_array($this->hooks[$type])) {
  59                         $key = array_Search($this->hooks[$type], $sender);
  60                         if ($key !== FALSE) {
  61                                 unset($this->hooks[$type][$key]);
  62                         }
  63                 }
  64         }
  65
  66         function get_hooks($type) {
  67                 if (isset($this->hooks[$type])) {
  68                         return $this->hooks[$type];
  69                 } else {
  70                         return array();
  71                 }
  72         }
  73         function load_all($kind) {
  74                 $plugins = array_map("basename", glob("plugins/*"));
  75                 $this->load(join(",", $plugins), $kind);
  76         }
  77
  78         function load($classlist, $kind) {
  79                 $plugins = explode(",", $classlist);
  80
  81                 foreach ($plugins as $class) {
  82                         $class = trim($class);
  83                         $class_file = strtolower(basename($class));
  84                         $file = dirname(__FILE__)."/../plugins/$class_file/$class_file.php";
  85
  86                         if (!isset($this->plugins[$class])) {
  87                                 if (file_exists($file)) require_once $file;
  88
  89                                 if (class_exists($class) && is_subclass_of($class, "Plugin")) {
  90                                         $plugin = new $class($this);
  91
  92                                         switch ($kind) {
  93                                         case $this::KIND_SYSTEM:
  94                                                 if ($this->is_system($plugin)) {
  95                                                         $plugin->init($this);
  96                                                         $this->register_plugin($class, $plugin);
  97                                                 }
  98                                                 break;
  99                                         case $this::KIND_USER:
 100                                                 if (!$this->is_system($plugin)) {
 101                                                         $plugin->init($this);
 102                                                         $this->register_plugin($class, $plugin);
 103                                                 }
 104                                                 break;
 105                                         case $this::KIND_ALL:
 106                                                 $plugin->init($this);
 107                                                 $this->register_plugin($class, $plugin);
 108                                                 break;
 109                                         }
 110                                 }
 111                         }
 112                 }
 113         }
 114
 115         function is_system($plugin) {
 116                 $about = $plugin->about();
 117
 118                 return @$about[3];
 119         }
 120
 121         // only system plugins are allowed to modify routing
 122         function add_handler($handler, $method, $sender) {
 123                 $handler = str_replace("-", "_", strtolower($handler));
 124                 $method = strtolower($method);
 125
 126                 if ($this->is_system($sender)) {
 127                         if (!is_array($this->handlers[$handler])) {
 128                                 $this->handlers[$handler] = array();
 129                         }
 130
 131                         $this->handlers[$handler][$method] = $sender;
 132                 }
 133         }
 134
 135         function del_handler($handler, $method) {
 136                 $handler = str_replace("-", "_", strtolower($handler));
 137                 $method = strtolower($method);
 138
 139                 if ($this->is_system($sender)) {
 140                         unset($this->handlers[$handler][$method]);
 141                 }
 142         }
 143
 144         function lookup_handler($handler, $method) {
 145                 $handler = str_replace("-", "_", strtolower($handler));
 146                 $method = strtolower($method);
 147
 148                 if (is_array($this->handlers[$handler])) {
 149                         if (isset($this->handlers[$handler]["*"])) {
 150                                 return $this->handlers[$handler]["*"];
 151                         } else {
 152                                 return $this->handlers[$handler][$method];
 153                         }
 154                 }
 155
 156                 return false;
 157         }
 158
 159         function add_command($command, $description, $sender) {
 160                 $command = "-" . str_replace("-", "_", strtolower($command));
 161
 162                 $this->commands[$command] = array("description" => $description,
 163                         "class" => $sender);
 164         }
 165
 166         function del_command($command) {
 167                 $command = "-" . strtolower($command);
 168
 169                 unset($this->commands[$command]);
 170         }
 171
 172         function lookup_command($command) {
 173                 $command = "-" . strtolower($command);
 174
 175                 if (is_array($this->commands[$command])) {
 176                         return $this->commands[$command]["class"];
 177                 } else {
 178                         return false;
 179                 }
 180
 181                 return false;
 182         }
 183
 184         function get_commands() {
 185                 return $this->commands;
 186         }
 187
 188         function run_commands($args) {
 189                 foreach ($this->get_commands() as $command => $data) {
 190                         if (in_array($command, $args)) {
 191                                 $command = str_replace("-", "", $command);
 192                                 $data["class"]->$command($args);
 193                         }
 194                 }
 195         }
 196
 197 }
 198 ?>