7b086a80 |
1 | <?php |
2 | |
35586184 |
3 | /** |
4 | * plugin.php |
5 | * |
35586184 |
6 | * This file provides the framework for a plugin architecture. |
7 | * |
8 | * Documentation on how to write plugins might show up some time. |
9 | * |
47ccfad4 |
10 | * @copyright © 1999-2006 The SquirrelMail Project Team |
4b4abf93 |
11 | * @license http://opensource.org/licenses/gpl-license.php GNU Public License |
31841a9e |
12 | * @version $Id$ |
d6c32258 |
13 | * @package squirrelmail |
35586184 |
14 | */ |
15 | |
d6c32258 |
16 | /** |
17 | * This function adds a plugin. |
18 | * @param string $name Internal plugin name (ie. delete_move_next) |
19 | * @return void |
20 | */ |
0606ca1f |
21 | function use_plugin ($name) { |
bd9c880b |
22 | if (file_exists(SM_PATH . "plugins/$name/setup.php")) { |
23 | include_once(SM_PATH . "plugins/$name/setup.php"); |
0606ca1f |
24 | $function = "squirrelmail_plugin_init_$name"; |
25 | if (function_exists($function)) { |
26 | $function(); |
2d367c68 |
27 | } |
2d367c68 |
28 | } |
0606ca1f |
29 | } |
2d367c68 |
30 | |
d6c32258 |
31 | /** |
32 | * This function executes a hook. |
33 | * @param string $name Name of hook to fire |
34 | * @return mixed $data |
35 | */ |
31524bcd |
36 | function do_hook ($name) { |
eb1f02bc |
37 | global $squirrelmail_plugin_hooks, $currentHookName; |
0606ca1f |
38 | $data = func_get_args(); |
eb1f02bc |
39 | $currentHookName = $name; |
a3439b27 |
40 | |
0606ca1f |
41 | if (isset($squirrelmail_plugin_hooks[$name]) |
42 | && is_array($squirrelmail_plugin_hooks[$name])) { |
43 | foreach ($squirrelmail_plugin_hooks[$name] as $function) { |
44 | /* Add something to set correct gettext domain for plugin. */ |
45 | if (function_exists($function)) { |
31524bcd |
46 | $function($data); |
47 | } |
48 | } |
49 | } |
50 | |
eb1f02bc |
51 | $currentHookName = ''; |
52 | |
31524bcd |
53 | /* Variable-length argument lists have a slight problem when */ |
54 | /* passing values by reference. Pity. This is a workaround. */ |
55 | return $data; |
56 | } |
57 | |
e900d242 |
58 | /** |
59 | * This function executes a hook and allows for parameters to be |
60 | * passed, wherein each plugin can modify the parameters before |
61 | * they are passed to the next funciton. Whether or not the |
62 | * parameters are modified, plugins on this hook should always |
63 | * return the given parameters. |
64 | * |
65 | * @param string name the name of the hook |
66 | * @param mixed param the parameters to pass to the hook function |
67 | * @return mixed the possibly modified hook parameters |
68 | */ |
69 | function filter_hook_function($name,$parm=NULL) { |
70 | global $squirrelmail_plugin_hooks, $currentHookName; |
71 | $ret = ''; |
72 | $currentHookName = $name; |
73 | |
74 | if (isset($squirrelmail_plugin_hooks[$name]) |
75 | && is_array($squirrelmail_plugin_hooks[$name])) { |
76 | foreach ($squirrelmail_plugin_hooks[$name] as $function) { |
77 | /* Add something to set correct gettext domain for plugin. */ |
78 | if (function_exists($function)) { |
79 | $parm = $function($parm); |
80 | } |
81 | } |
82 | } |
83 | |
84 | $currentHookName = ''; |
85 | |
86 | /* Variable-length argument lists have a slight problem when */ |
87 | /* passing values by reference. Pity. This is a workaround. */ |
88 | return $parm; |
89 | } |
90 | |
8b096f0a |
91 | /** |
92 | * This function executes a hook and allows for parameters to be passed. |
93 | * |
94 | * @param string name the name of the hook |
95 | * @param mixed param the parameters to pass to the hook function |
96 | * @return mixed the return value of the hook function |
97 | */ |
31524bcd |
98 | function do_hook_function($name,$parm=NULL) { |
eb1f02bc |
99 | global $squirrelmail_plugin_hooks, $currentHookName; |
31524bcd |
100 | $ret = ''; |
eb1f02bc |
101 | $currentHookName = $name; |
31524bcd |
102 | |
103 | if (isset($squirrelmail_plugin_hooks[$name]) |
104 | && is_array($squirrelmail_plugin_hooks[$name])) { |
105 | foreach ($squirrelmail_plugin_hooks[$name] as $function) { |
106 | /* Add something to set correct gettext domain for plugin. */ |
107 | if (function_exists($function)) { |
108 | $ret = $function($parm); |
dd389be5 |
109 | } |
2d367c68 |
110 | } |
2d367c68 |
111 | } |
7b086a80 |
112 | |
eb1f02bc |
113 | $currentHookName = ''; |
114 | |
0606ca1f |
115 | /* Variable-length argument lists have a slight problem when */ |
116 | /* passing values by reference. Pity. This is a workaround. */ |
2586d588 |
117 | return $ret; |
0606ca1f |
118 | } |
7b086a80 |
119 | |
8b096f0a |
120 | /** |
7edd8ad6 |
121 | * This function executes a hook, allows for parameters to be passed, |
122 | * and looks for an array returned from each plugin: each array is |
123 | * then merged into one and returned to the core hook location. |
124 | * |
125 | * Note that unlike PHP's array_merge function, matching array keys |
126 | * will not overwrite each other, instead, values under such keys |
127 | * will be concatenated if they are both strings, or merged if they |
128 | * are arrays (in the same (non-overwrite) manner recursively). |
129 | * |
130 | * Plugins returning non-arrays (strings, objects, etc) will have |
131 | * their output added to the end of the ultimate return array, |
132 | * unless ALL values returned are strings, in which case one string |
133 | * with all returned strings concatenated together is returned. |
8b096f0a |
134 | * |
135 | * @param string name the name of the hook |
7edd8ad6 |
136 | * @param mixed param the parameters to pass to the hook function |
137 | * |
138 | * @return mixed the merged return arrays or strings of each |
139 | * plugin on this hook |
140 | * |
8b096f0a |
141 | */ |
09ac2863 |
142 | function concat_hook_function($name,$parm=NULL) { |
eb1f02bc |
143 | global $squirrelmail_plugin_hooks, $currentHookName; |
bbac5629 |
144 | $ret = ''; |
eb1f02bc |
145 | $currentHookName = $name; |
31524bcd |
146 | |
09ac2863 |
147 | if (isset($squirrelmail_plugin_hooks[$name]) |
148 | && is_array($squirrelmail_plugin_hooks[$name])) { |
149 | foreach ($squirrelmail_plugin_hooks[$name] as $function) { |
7edd8ad6 |
150 | /* Add something to set correct gettext domain for plugin. */ |
09ac2863 |
151 | if (function_exists($function)) { |
5fba72db |
152 | $plugin_ret = $function($parm); |
153 | if (!empty($plugin_ret)) { |
154 | $ret = sqm_array_merge($ret, $plugin_ret); |
155 | } |
09ac2863 |
156 | } |
157 | } |
158 | } |
159 | |
eb1f02bc |
160 | $currentHookName = ''; |
161 | |
09ac2863 |
162 | /* Variable-length argument lists have a slight problem when */ |
163 | /* passing values by reference. Pity. This is a workaround. */ |
164 | return $ret; |
165 | } |
cd7fc9e6 |
166 | |
5576644b |
167 | /** |
168 | * This function is used for hooks which are to return true or |
169 | * false. If $priority is > 0, any one or more trues will override |
170 | * any falses. If $priority < 0, then one or more falses will |
171 | * override any trues. |
8b096f0a |
172 | * Priority 0 means majority rules. Ties will be broken with $tie |
173 | * |
174 | * @param string name the hook name |
175 | * @param mixed parm the parameters for the hook function |
176 | * @param int priority |
177 | * @param bool tie |
178 | * @return bool the result of the function |
179 | */ |
5576644b |
180 | function boolean_hook_function($name,$parm=NULL,$priority=0,$tie=false) { |
eb1f02bc |
181 | global $squirrelmail_plugin_hooks, $currentHookName; |
5576644b |
182 | $yea = 0; |
183 | $nay = 0; |
184 | $ret = $tie; |
185 | |
186 | if (isset($squirrelmail_plugin_hooks[$name]) && |
187 | is_array($squirrelmail_plugin_hooks[$name])) { |
188 | |
189 | /* Loop over the plugins that registered the hook */ |
eb1f02bc |
190 | $currentHookName = $name; |
5576644b |
191 | foreach ($squirrelmail_plugin_hooks[$name] as $function) { |
192 | if (function_exists($function)) { |
193 | $ret = $function($parm); |
194 | if ($ret) { |
195 | $yea++; |
196 | } else { |
197 | $nay++; |
198 | } |
199 | } |
200 | } |
eb1f02bc |
201 | $currentHookName = ''; |
5576644b |
202 | |
203 | /* Examine the aftermath and assign the return value appropriately */ |
204 | if (($priority > 0) && ($yea)) { |
205 | $ret = true; |
206 | } elseif (($priority < 0) && ($nay)) { |
207 | $ret = false; |
208 | } elseif ($yea > $nay) { |
209 | $ret = true; |
210 | } elseif ($nay > $yea) { |
211 | $ret = false; |
212 | } else { |
213 | // There's a tie, no action needed. |
214 | } |
215 | return $ret; |
216 | } |
217 | // If the code gets here, there was a problem - no hooks, etc. |
218 | return NULL; |
219 | } |
220 | |
cd7fc9e6 |
221 | /** |
222 | * This function checks whether the user's USER_AGENT is known to |
223 | * be broken. If so, returns true and the plugin is invisible to the |
224 | * offending browser. |
7349fa12 |
225 | * *** THIS IS A TEST FOR JAVASCRIPT SUPPORT *** |
94ba79ce |
226 | * FIXME: This function needs to have its name changed! |
8b096f0a |
227 | * |
228 | * @return bool whether this browser properly supports JavaScript |
ccacde36 |
229 | * @deprecated use checkForJavascript() since 1.5.1 |
cd7fc9e6 |
230 | */ |
231 | function soupNazi(){ |
7349fa12 |
232 | return !checkForJavascript(); |
cd7fc9e6 |
233 | } |
fe0aa536 |
234 | |
235 | /** |
236 | * Check if plugin is enabled |
237 | * @param string $plugin_name plugin name |
238 | * @since 1.5.1 |
239 | * @return boolean |
240 | */ |
241 | function is_plugin_enabled($plugin_name) { |
242 | global $plugins; |
243 | |
e83cfcef |
244 | /** |
202bcbcc |
245 | * check if variable is empty. if var is not set, php empty |
e495bd68 |
246 | * returns true without error notice. |
247 | * |
248 | * then check if it is an array |
e83cfcef |
249 | */ |
e495bd68 |
250 | if (empty($plugins) || ! is_array($plugins)) |
fe0aa536 |
251 | return false; |
252 | |
253 | if ( in_array($plugin_name,$plugins) ) { |
254 | return true; |
255 | } else { |
256 | return false; |
257 | } |
258 | } |
d99b6c56 |
259 | |
260 | /** |
261 | * Check a plugin's version. |
262 | * |
263 | * Returns TRUE if the given plugin is installed, |
264 | * activated and is at minimum version $a.$b.$c. |
265 | * If any one of those conditions fails, FALSE |
266 | * will be returned (careful of plugins that are |
267 | * sufficiently versioned but are not activated). |
268 | * |
269 | * By overriding the default value of $force_inclusion, |
270 | * this function will attempt to grab versioning |
271 | * information from the given plugin even if it |
272 | * is not activated (plugin still has to be |
273 | * unpackaged and set in place in the plugins |
274 | * directory). Use with care - some plugins |
275 | * might break SquirrelMail when this is used. |
276 | * |
277 | * Note that this function assumes plugin |
278 | * versioning is consistently applied in the same |
279 | * fashion that SquirrelMail versions are, with the |
280 | * exception that an applicable SquirrelMail |
281 | * version may be appended to the version number |
282 | * (which will be ignored herein). That is, plugin |
283 | * version number schemes are expected in the following |
284 | * format: 1.2.3, or 1.2.3-1.4.0. |
285 | * |
286 | * Any characters after the third number are discarded, |
287 | * so formats such as the following will also work, |
288 | * although extra information about beta versions can |
289 | * possibly confuse the desired results of the version |
290 | * check: 1.2.3-beta4, 1.2.3.RC2, and so forth. |
291 | * |
b2a6a14c |
292 | * @since 1.5.2 |
d99b6c56 |
293 | * |
294 | * @param string plugin_name name of the plugin to |
295 | * check; must precisely |
296 | * match the plugin |
297 | * directory name |
298 | * @param int a major version number |
299 | * @param int b minor version number |
300 | * @param int c release number |
301 | * @param bool force_inclusion try to get version info |
302 | * for plugins not activated? |
303 | * (default FALSE) |
304 | * |
305 | * @return bool |
306 | * |
307 | */ |
308 | function check_plugin_version($plugin_name, |
309 | $a = 0, $b = 0, $c = 0, |
310 | $force_inclusion = FALSE) |
311 | { |
312 | |
6b6bcf00 |
313 | $info_function = $plugin_name . '_info'; |
d99b6c56 |
314 | $version_function = $plugin_name . '_version'; |
6b6bcf00 |
315 | $plugin_info = array(); |
d99b6c56 |
316 | $plugin_version = FALSE; |
317 | |
318 | |
6b6bcf00 |
319 | // first attempt to find the plugin info function, wherein |
320 | // the plugin version should be available |
d99b6c56 |
321 | // |
6b6bcf00 |
322 | if (function_exists($info_function)) |
323 | $plugin_info = $info_function(); |
d99b6c56 |
324 | else if ($force_inclusion |
325 | && file_exists(SM_PATH . 'plugins/' . $plugin_name . '/setup.php')) |
326 | { |
327 | include_once(SM_PATH . 'plugins/' . $plugin_name . '/setup.php'); |
6b6bcf00 |
328 | if (function_exists($info_function)) |
329 | $plugin_info = $info_function(); |
d99b6c56 |
330 | } |
6b6bcf00 |
331 | if (!empty($plugin_info['version'])) |
332 | $plugin_version = $plugin_info['version']; |
333 | |
334 | |
335 | // otherwise, look for older version function |
336 | // |
337 | if (!$plugin_version && function_exists($version_function)) |
338 | $plugin_version = $version_function(); |
339 | |
d99b6c56 |
340 | |
341 | if (!$plugin_version) return FALSE; |
342 | |
343 | |
344 | // now massage version number into something we understand |
345 | // |
346 | $plugin_version = trim(preg_replace(array('/[^0-9.]+.*$/', '/[^0-9.]/'), |
347 | '', $plugin_version), |
348 | '.'); |
349 | $plugin_version = explode('.', $plugin_version); |
350 | if (!isset($plugin_version[0])) $plugin_version[0] = 0; |
351 | if (!isset($plugin_version[1])) $plugin_version[1] = 0; |
352 | if (!isset($plugin_version[2])) $plugin_version[2] = 0; |
353 | // sm_print_r($plugin_version); |
354 | |
355 | |
356 | // now test the version number |
357 | // |
358 | if ($plugin_version[0] < $a || |
359 | ($plugin_version[0] == $a && $plugin_version[1] < $b) || |
360 | ($plugin_version[0] == $a && $plugin_version[1] == $b && $plugin_version[2] < $c)) |
361 | return FALSE; |
362 | |
363 | |
364 | return TRUE; |
365 | |
366 | } |
367 | |