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-rw-r--r--application/plugin/PluginManager.php233
-rw-r--r--application/plugin/exception/PluginFileNotFoundException.php23
2 files changed, 256 insertions, 0 deletions
diff --git a/application/plugin/PluginManager.php b/application/plugin/PluginManager.php
new file mode 100644
index 00000000..f7b24a8e
--- /dev/null
+++ b/application/plugin/PluginManager.php
@@ -0,0 +1,233 @@
1<?php
2namespace Shaarli\Plugin;
3
4use Shaarli\Config\ConfigManager;
5use Shaarli\Plugin\Exception\PluginFileNotFoundException;
6
7/**
8 * Class PluginManager
9 *
10 * Use to manage, load and execute plugins.
11 */
12class PluginManager
13{
14 /**
15 * List of authorized plugins from configuration file.
16 *
17 * @var array $authorizedPlugins
18 */
19 private $authorizedPlugins;
20
21 /**
22 * List of loaded plugins.
23 *
24 * @var array $loadedPlugins
25 */
26 private $loadedPlugins = array();
27
28 /**
29 * @var ConfigManager Configuration Manager instance.
30 */
31 protected $conf;
32
33 /**
34 * @var array List of plugin errors.
35 */
36 protected $errors;
37
38 /**
39 * Plugins subdirectory.
40 *
41 * @var string $PLUGINS_PATH
42 */
43 public static $PLUGINS_PATH = 'plugins';
44
45 /**
46 * Plugins meta files extension.
47 *
48 * @var string $META_EXT
49 */
50 public static $META_EXT = 'meta';
51
52 /**
53 * Constructor.
54 *
55 * @param ConfigManager $conf Configuration Manager instance.
56 */
57 public function __construct(&$conf)
58 {
59 $this->conf = $conf;
60 $this->errors = array();
61 }
62
63 /**
64 * Load plugins listed in $authorizedPlugins.
65 *
66 * @param array $authorizedPlugins Names of plugin authorized to be loaded.
67 *
68 * @return void
69 */
70 public function load($authorizedPlugins)
71 {
72 $this->authorizedPlugins = $authorizedPlugins;
73
74 $dirs = glob(self::$PLUGINS_PATH . '/*', GLOB_ONLYDIR);
75 $dirnames = array_map('basename', $dirs);
76 foreach ($this->authorizedPlugins as $plugin) {
77 $index = array_search($plugin, $dirnames);
78
79 // plugin authorized, but its folder isn't listed
80 if ($index === false) {
81 continue;
82 }
83
84 try {
85 $this->loadPlugin($dirs[$index], $plugin);
86 } catch (PluginFileNotFoundException $e) {
87 error_log($e->getMessage());
88 }
89 }
90 }
91
92 /**
93 * Execute all plugins registered hook.
94 *
95 * @param string $hook name of the hook to trigger.
96 * @param array $data list of data to manipulate passed by reference.
97 * @param array $params additional parameters such as page target.
98 *
99 * @return void
100 */
101 public function executeHooks($hook, &$data, $params = array())
102 {
103 if (!empty($params['target'])) {
104 $data['_PAGE_'] = $params['target'];
105 }
106
107 if (isset($params['loggedin'])) {
108 $data['_LOGGEDIN_'] = $params['loggedin'];
109 }
110
111 foreach ($this->loadedPlugins as $plugin) {
112 $hookFunction = $this->buildHookName($hook, $plugin);
113
114 if (function_exists($hookFunction)) {
115 $data = call_user_func($hookFunction, $data, $this->conf);
116 }
117 }
118 }
119
120 /**
121 * Load a single plugin from its files.
122 * Call the init function if it exists, and collect errors.
123 * Add them in $loadedPlugins if successful.
124 *
125 * @param string $dir plugin's directory.
126 * @param string $pluginName plugin's name.
127 *
128 * @return void
129 * @throws \Shaarli\Plugin\Exception\PluginFileNotFoundException - plugin files not found.
130 */
131 private function loadPlugin($dir, $pluginName)
132 {
133 if (!is_dir($dir)) {
134 throw new PluginFileNotFoundException($pluginName);
135 }
136
137 $pluginFilePath = $dir . '/' . $pluginName . '.php';
138 if (!is_file($pluginFilePath)) {
139 throw new PluginFileNotFoundException($pluginName);
140 }
141
142 $conf = $this->conf;
143 include_once $pluginFilePath;
144
145 $initFunction = $pluginName . '_init';
146 if (function_exists($initFunction)) {
147 $errors = call_user_func($initFunction, $this->conf);
148 if (!empty($errors)) {
149 $this->errors = array_merge($this->errors, $errors);
150 }
151 }
152
153 $this->loadedPlugins[] = $pluginName;
154 }
155
156 /**
157 * Construct normalize hook name for a specific plugin.
158 *
159 * Format:
160 * hook_<plugin_name>_<hook_name>
161 *
162 * @param string $hook hook name.
163 * @param string $pluginName plugin name.
164 *
165 * @return string - plugin's hook name.
166 */
167 public function buildHookName($hook, $pluginName)
168 {
169 return 'hook_' . $pluginName . '_' . $hook;
170 }
171
172 /**
173 * Retrieve plugins metadata from *.meta (INI) files into an array.
174 * Metadata contains:
175 * - plugin description [description]
176 * - parameters split with ';' [parameters]
177 *
178 * Respects plugins order from settings.
179 *
180 * @return array plugins metadata.
181 */
182 public function getPluginsMeta()
183 {
184 $metaData = array();
185 $dirs = glob(self::$PLUGINS_PATH . '/*', GLOB_ONLYDIR | GLOB_MARK);
186
187 // Browse all plugin directories.
188 foreach ($dirs as $pluginDir) {
189 $plugin = basename($pluginDir);
190 $metaFile = $pluginDir . $plugin . '.' . self::$META_EXT;
191 if (!is_file($metaFile) || !is_readable($metaFile)) {
192 continue;
193 }
194
195 $metaData[$plugin] = parse_ini_file($metaFile);
196 $metaData[$plugin]['order'] = array_search($plugin, $this->authorizedPlugins);
197
198 if (isset($metaData[$plugin]['description'])) {
199 $metaData[$plugin]['description'] = t($metaData[$plugin]['description']);
200 }
201 // Read parameters and format them into an array.
202 if (isset($metaData[$plugin]['parameters'])) {
203 $params = explode(';', $metaData[$plugin]['parameters']);
204 } else {
205 $params = array();
206 }
207 $metaData[$plugin]['parameters'] = array();
208 foreach ($params as $param) {
209 if (empty($param)) {
210 continue;
211 }
212
213 $metaData[$plugin]['parameters'][$param]['value'] = '';
214 // Optional parameter description in parameter.PARAM_NAME=
215 if (isset($metaData[$plugin]['parameter.' . $param])) {
216 $metaData[$plugin]['parameters'][$param]['desc'] = t($metaData[$plugin]['parameter.' . $param]);
217 }
218 }
219 }
220
221 return $metaData;
222 }
223
224 /**
225 * Return the list of encountered errors.
226 *
227 * @return array List of errors (empty array if none exists).
228 */
229 public function getErrors()
230 {
231 return $this->errors;
232 }
233}
diff --git a/application/plugin/exception/PluginFileNotFoundException.php b/application/plugin/exception/PluginFileNotFoundException.php
new file mode 100644
index 00000000..e5386f02
--- /dev/null
+++ b/application/plugin/exception/PluginFileNotFoundException.php
@@ -0,0 +1,23 @@
1<?php
2namespace Shaarli\Plugin\Exception;
3
4use Exception;
5
6/**
7 * Class PluginFileNotFoundException
8 *
9 * Raise when plugin files can't be found.
10 */
11class PluginFileNotFoundException extends Exception
12{
13 /**
14 * Construct exception with plugin name.
15 * Generate message.
16 *
17 * @param string $pluginName name of the plugin not found
18 */
19 public function __construct($pluginName)
20 {
21 $this->message = sprintf(t('Plugin "%s" files not found.'), $pluginName);
22 }
23}