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1 | $Id$ |
2 | |
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3 | In addition to this document, please check out the SquirrelMail |
4 | development FAQ for more information. Also, help writing plugins |
5 | is easily obtained by posting to the squirrelmail-plugins mailing |
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6 | list. (See details about mailing lists on the website) |
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7 | |
8 | FAQ -> http://www.squirrelmail.org/wiki/wiki.php?DeveloperFAQ |
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9 | Plugin Development -> |
10 | http://www.squirrelmail.org/wiki/wiki.php?DevelopingPlugins |
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11 | |
12 | |
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13 | A FEW NOTES ON THE PLUGIN ARCHITECTURE |
14 | ====================================== |
15 | |
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16 | The plugin architecture of SquirrelMail is designed to make it possible |
17 | to add new features without having to patch SquirrelMail itself. |
18 | Functionality like password changing, displaying ads and calendars should |
19 | be possible to add as plugins. |
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20 | |
21 | |
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22 | The Idea |
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23 | -------- |
24 | |
25 | The idea is to be able to run random code at given places in the |
26 | SquirrelMail code. This random code should then be able to do whatever |
27 | needed to enhance the functionality of SquirrelMail. The places where |
28 | code can be executed are called "hooks". |
29 | |
30 | There are some limitations in what these hooks can do. It is difficult |
31 | to use them to change the layout and to change functionality that |
32 | already is in SquirrelMail. |
33 | |
34 | Some way for the plugins to interact with the help subsystem and |
35 | translations will be provided. |
36 | |
37 | |
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38 | The Implementation |
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39 | ------------------ |
40 | |
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41 | The plugin jumping off point in the main SquirrelMail code is in the |
42 | file functions/plugin.php. In places where hooks are made available, |
43 | they are executed by calling the function do_hook('hookname'). The |
44 | do_hook function then traverses the array |
45 | $squirrelmail_plugin_hooks['hookname'] and executes all the functions |
46 | that are named in that array. Those functions are placed there when |
47 | plugins register themselves with SquirrelMail as discussed below. A |
48 | plugin may add its own internal functions to this array under any |
49 | hook name provided by the SquirrelMail developers. |
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50 | |
51 | A plugin must reside in a subdirectory in the plugins/ directory. The |
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52 | name of the subdirectory is considered to be the name of the plugin. |
53 | (The plugin will not function correctly if this is not the case.) |
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54 | |
55 | To start using a plugin, its name must be added to the $plugins array |
56 | in config.php like this: |
57 | |
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58 | $plugins[0] = 'plugin_name'; |
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59 | |
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60 | When a plugin is registered, the file plugins/plugin_name/setup.php is |
61 | included and the function squirrelmail_plugin_init_plugin_name() is |
62 | called with no parameters. That function is where the plugin may |
63 | register itself against any hooks it wishes to take advantage of. |
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64 | |
65 | |
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66 | WRITING PLUGINS |
67 | =============== |
68 | |
69 | All plugins must contain a file called setup.php and must include a |
70 | function called squirrelmail_plugin_init_plugin_name() therein. Since |
71 | including numerous plugins can slow SquirrelMail performance |
72 | considerably, the setup.php file should contain little else. Any |
73 | functions that are registered against plugin hooks should do little |
74 | more than call another function in a different file. |
75 | |
76 | Any other files used by the plugin should also be placed in the |
77 | plugin directory (or subdirectory thereof) and should contain the |
78 | bulk of the plugin logic. |
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79 | |
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80 | The function squirrelmail_plugin_init_plugin_name() is called to |
81 | initalize a plugin. This function could look something like this (if |
82 | the plugin was named "demo" and resided in the directory plugins/demo/): |
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83 | |
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84 | function squirrelmail_plugin_init_demo () |
85 | { |
86 | global $squirrelmail_plugin_hooks; |
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87 | |
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88 | $squirrelmail_plugin_hooks['generic_header']['demo'] = 'plugin_demo_header'; |
89 | $squirrelmail_plugin_hooks['menuline']['demo'] = 'plugin_demo_menuline'; |
90 | } |
91 | |
92 | Please note that as of SquirrelMail 1.5.0, this function will no longer |
93 | be called at run time and will instead be called only once at configure- |
94 | time. Thus, the inclusion of any dynamic code (anything except hook |
95 | registration) here is strongly discouraged. |
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96 | |
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97 | In this example, the "demo" plugin should also have two other functions |
98 | in its setup.php file called plugin_demo_header() and plugin_demo_menuline(). |
99 | The first of these might look something like this: |
100 | |
101 | function plugin_demo_header() |
102 | { |
103 | include_once(SM_PATH . 'plugins/demo/functions.php'); |
104 | plugin_demo_header_do(); |
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105 | } |
106 | |
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107 | The function called plugin_demo_header_do() would be in the file called |
108 | functions.php in the demo plugin directory and would contain the plugin's |
109 | core logic for the "generic_header" hook. |
110 | |
111 | |
112 | Including Other Files |
113 | --------------------- |
114 | |
115 | A plugin may need to reference functionality provided in other |
116 | files, and therefore need to include those files. Most of the |
117 | core SquirrelMail functions are already available to your plugin |
118 | unless it has any files that are requested directly by the client |
119 | browser (custom options page, etc.). In this case, you'll need |
120 | to make sure you include the files you need (see below). |
121 | |
122 | Note that as of SquirrelMail 1.4.0, all files are accessed using a |
123 | constant called SM_PATH that always contains the relative path to |
124 | the main SquirrelMail directory. This constant is always available |
125 | for you to use when including other files from the SquirrelMail core, |
126 | your own plugin, or other plugins, should the need arise. If any of |
127 | your plugin files are requested directly from the client browser, |
128 | you will need to define this constant before you do anything else: |
129 | |
130 | define('SM_PATH', '../../'); |
131 | |
132 | Files are included like this: |
133 | |
134 | include_once(SM_PATH . 'include/validate.php'); |
135 | |
136 | When including files, please make sure to use the include_once() function |
137 | and NOT include(), require(), or require_once(), since these all are much |
138 | less efficient than include_once() and can have a cumulative effect on |
139 | SquirrelMail performance. |
140 | |
141 | The files that you may need to include in a plugin will vary greatly |
142 | depending upon what the plugin is designed to do. For files that are |
143 | requested directly by the client browser, we strongly recommend that |
144 | you include the file include/validate.php, since it will set up the |
145 | SquirrelMail environment automatically. It will ensure the the user |
146 | has been authenticated and is currently logged in, load all user |
147 | preferences, include internationalization support, call stripslashes() |
148 | on all incoming data (if magic_quotes_gpc is on), and initialize and |
149 | include all other basic SquirrelMail resources and functions. You may |
150 | see other plugins that directly include other SquirrelMail files, but |
151 | that is no longer necessary and is a hold-over from older SquirrelMail |
152 | versions. |
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153 | |
154 | |
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155 | Hook Types: Parameters and Return Values |
156 | ----------------------------------------- |
157 | |
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158 | Hooks, when executed, are called with one parameter, an array of data |
159 | that is passed to the hook. The first element in the array is the name |
160 | of the hook that is being called. Any other elements in the array are |
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161 | dependant on the type of hook that is being called. Most hooks do not |
162 | pass any other data, but be sure to check the hook you are using for |
163 | any useful information it may provide. Generally speaking, in the case |
164 | that any extra data is available here, your plugin should NOT change |
165 | it unless you know what you are doing or it is documented otherwise. |
166 | See below for further discussion of special hook types and the values |
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167 | |
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168 | Most hooks, when executed, are called using the do_hook() function, |
169 | where no return value is used. There are a limited number of hooks, |
170 | however, that are called using the do_hook_function() and |
171 | concat_hook_function() function calls. Both of these hook types may |
172 | use the value returned by your plugin for its own purposes or to |
173 | display in the resultant HTML output (you need to research the specific |
174 | hook to determine its use). The do_hook_function() type hook will |
175 | only use the return value it retrieves from the LAST plugin in the |
176 | list of plugins registered against such a hook, whereas the |
177 | concat_hook_function() type hook will concatenate the return values |
178 | from all plugins that are registered against the hook and use that |
179 | value (usually as a string of HTML code to output to the client). |
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180 | |
181 | |
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182 | List of Hooks |
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183 | ------------- |
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184 | |
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185 | This is a list of all hooks currently available in SquirrelMail, ordered |
186 | by file. Note that this list is accurate as of June 17, 2003 (should be |
187 | close to what is contained in release 1.4.1, plus or minus a hook or two), |
188 | but may be out of date soon thereafter. You never know. ;-) |
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189 | |
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190 | Hook Name Found In Called With(#) |
191 | --------- -------- -------------- |
192 | loading_constants functions/constants.php do_hook |
193 | get_pref_override functions/file_prefs.php hook_func |
194 | get_pref functions/file_prefs.php hook_func |
195 | special_mailbox functions/imap_mailbox.php hook_func |
196 | % rename_or_delete_folder functions/imap_mailbox.php hook_func |
197 | msg_envelope functions/mailbox_display.php do_hook |
198 | mailbox_index_before functions/mailbox_display.php do_hook |
199 | mailbox_form_before functions/mailbox_display.php do_hook |
200 | mailbox_index_after functions/mailbox_display.php do_hook |
201 | check_handleAsSent_result functions/mailbox_display.php do_hook |
202 | subject_link functions/mailbox_display.php concat_hook |
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203 | mailbox_display_buttons functions/mailbox_display.php do_hook |
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204 | message_body functions/mime.php do_hook |
205 | ^ attachment $type0/$type1 functions/mime.php do_hook |
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206 | attachments_bottom functions/mime.php hook_func |
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207 | decode_body functions/mime.php hook_func |
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208 | generic_header functions/page_header.php do_hook |
209 | menuline functions/page_header.php do_hook |
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210 | internal_link functions/page_header.php hook_func |
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211 | loading_prefs include/load_prefs.php do_hook |
212 | addrbook_html_search_below src/addrbook_search_html.php do_hook |
213 | addressbook_bottom src/addressbook.php do_hook |
214 | compose_form src/compose.php do_hook |
215 | compose_bottom src/compose.php do_hook |
216 | compose_button_row src/compose.php do_hook |
217 | compose_send src/compose.php do_hook |
218 | folders_bottom src/folders.php do_hook |
219 | help_top src/help.php do_hook |
220 | help_chapter src/help.php do_hook |
221 | help_bottom src/help.php do_hook |
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222 | left_main_after_each_folder src/left_main.php concat_hook |
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223 | left_main_before src/left_main.php do_hook |
224 | left_main_after src/left_main.php do_hook |
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225 | create_collapse_link src/left_main.php hook_func |
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226 | login_cookie src/login.php do_hook |
227 | login_top src/login.php do_hook |
228 | login_form src/login.php do_hook |
229 | login_bottom src/login.php do_hook |
230 | move_before_move src/move_messages.php do_hook |
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231 | move_messages_button_action src/move_messages.php concat_hook |
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232 | * optpage_set_loadinfo src/options.php do_hook |
233 | * optpage_loadhook_personal src/options.php do_hook |
234 | * optpage_loadhook_display src/options.php do_hook |
235 | * optpage_loadhook_highlight src/options.php do_hook |
236 | * optpage_loadhook_folder src/options.php do_hook |
237 | * optpage_loadhook_order src/options.php do_hook |
238 | * options_personal_save src/options.php do_hook |
239 | * options_display_save src/options.php do_hook |
240 | * options_folder_save src/options.php do_hook |
241 | * options_save src/options.php do_hook |
242 | * optpage_register_block src/options.php do_hook |
243 | * options_link_and_description src/options.php do_hook |
244 | * options_personal_inside src/options.php do_hook |
245 | * options_display_inside src/options.php do_hook |
246 | * options_highlight_inside src/options.php do_hook |
247 | * options_folder_inside src/options.php do_hook |
248 | * options_order_inside src/options.php do_hook |
249 | * options_personal_bottom src/options.php do_hook |
250 | * options_display_bottom src/options.php do_hook |
251 | * options_highlight_bottom src/options.php do_hook |
252 | * options_folder_bottom src/options.php do_hook |
253 | * options_order_bottom src/options.php do_hook |
254 | * options_highlight_bottom src/options_highlight.php do_hook |
255 | & options_identities_process src/options_identities.php do_hook |
256 | & options_identities_top src/options_identities.php do_hook |
257 | &% options_identities_renumber src/options_identities.php do_hook |
258 | & options_identities_table src/options_identities.php concat_hook |
259 | & options_identities_buttons src/options_identities.php concat_hook |
260 | message_body src/printer_friendly_bottom.php do_hook |
261 | read_body_header src/read_body.php do_hook |
262 | read_body_menu_top src/read_body.php do_hook |
263 | read_body_menu_bottom src/read_body.php do_hook |
264 | read_body_header_right src/read_body.php do_hook |
265 | html_top src/read_body.php do_hook |
266 | read_body_top src/read_body.php do_hook |
267 | read_body_bottom src/read_body.php do_hook |
268 | html_bottom src/read_body.php do_hook |
269 | login_before src/redirect.php do_hook |
270 | login_verified src/redirect.php do_hook |
271 | generic_header src/right_main.php do_hook |
272 | right_main_after_header src/right_main.php do_hook |
273 | right_main_bottom src/right_main.php do_hook |
274 | search_before_form src/search.php do_hook |
275 | search_after_form src/search.php do_hook |
276 | search_bottom src/search.php do_hook |
277 | logout src/signout.php do_hook |
278 | webmail_top src/webmail.php do_hook |
279 | webmail_bottom src/webmail.php do_hook |
280 | logout_above_text src/signout.php concat_hook |
281 | |
282 | % = This hook is used in multiple places in the given file |
283 | # = Called with hook type (see below) |
284 | & = Special identity hooks (see below) |
285 | ^ = Special attachments hook (see below) |
286 | * = Special options hooks (see below) |
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287 | |
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288 | |
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289 | (#) Called With |
290 | --------------- |
291 | Each hook is called using the hook type specified in the list above: |
292 | do_hook do_hook() |
293 | hook_func do_hook_function() |
294 | concat_hook concat_hook_function() |
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295 | |
296 | |
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297 | (&) Identity Hooks |
298 | ------------------ |
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299 | This set of hooks is passed special information in the array of arguments: |
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300 | |
301 | options_identities_process |
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302 | |
303 | This hook is called at the top of the Identities page, which is |
304 | most useful when the user has changed any identity settings - this |
305 | is where you'll want to save any custom information you are keeping |
306 | for each identity or catch any custom submit buttons that you may |
307 | have added to the identities page. The arguments to this hook are: |
308 | |
309 | [0] = hook name (always "options_identities_process") |
310 | [1] = should I run the SaveUpdateFunction() (alterable) |
311 | |
312 | Obviously, set the second array element to 1/true if you want to |
313 | trigger SaveUpdateFunction() after the hook is finished - by default, |
314 | it will not be called. |
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315 | |
316 | options_identities_renumber |
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317 | |
318 | This hook is called when one of the identities is being renumbered, |
319 | such as if the user had three identities and deletes the second - |
320 | this hook would be called with an array that looks like this: |
321 | ('options_identities_renumber', 2, 1). The arguments to this hook |
322 | are: |
323 | |
324 | [0] = hook name (always "options_identities_renumber") |
325 | [1] = being renumbered from ('default' or 1 through (# idents) - 1) |
326 | [2] = being renumbered to ('default' or 1 through (# idents) - 1) |
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327 | |
328 | options_identities_table |
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329 | |
330 | This hook allows you to insert additional rows into the table that |
331 | holds each identity. The arguments to this hook are: |
332 | |
333 | [0] = color of table (use it like this in your plugin: |
334 | <tr bgcolor="<?PHP echo $info[1]?>"> |
335 | [1] = is this an empty section (the one at the end of the list)? |
336 | [2] = what is the 'post' value? (ident # or empty string if default) |
337 | |
338 | You need to return any HTML you would like to add to the table. |
339 | You could add a table row with code similar to this: |
340 | |
341 | function demo_identities_table(&$args) |
342 | { |
343 | return '<tr bgcolor="' . $args[0] . '"><td> </td><td>' |
344 | . 'YOUR CODE HERE' . '</td></tr>' . "\n"; |
345 | } |
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346 | |
347 | options_identities_buttons |
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348 | |
349 | This hook allows you to add a button (or other HTML) to the row of |
350 | buttons under each identity. The arguments to this hook are: |
351 | |
352 | [0] = is this an empty section (the one at the end of the list)? |
353 | [1] = what is the 'post' value? (ident # or empty string if default) |
354 | |
355 | You need to return any HTML you would like to add here. You could add |
356 | a button with code similar to this: |
357 | |
358 | function demo_identities_button(&$args) |
359 | { |
360 | return '<input type="submit" name="demo_button_' . $args[1] |
361 | . '" value="Press Me">'; |
362 | } |
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363 | |
364 | |
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365 | (^) Attachment Hooks |
366 | -------------------- |
367 | When a message has attachments, this hook is called with the MIME types. For |
368 | instance, a .zip file hook is "attachment application/x-zip". The hook should |
369 | probably show a link to do a specific action, such as "Verify" or "View" for a |
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370 | .zip file. Thus, to register your plugin for .zip attachments, you'd do this |
371 | in setup.php (assuming your plugin is called "demo"): |
372 | |
373 | $squirrelmail_plugin_hooks['attachment application/x-zip']['demo'] |
374 | = 'demo_handle_zip_attachment'; |
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375 | |
376 | This is a breakdown of the data passed in the array to the hook that is called: |
377 | |
378 | [0] = Hook's name ('attachment text/plain') |
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379 | [1] = Array of links of actions (see below) (alterable) |
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380 | [2] = Used for returning to mail message (startMessage) |
381 | [3] = Used for finding message to display (id) |
382 | [4] = Mailbox name, urlencode()'d (urlMailbox) |
383 | [5] = Entity ID inside mail message (ent) |
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384 | [6] = Default URL to go to when filename is clicked on (alterable) |
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385 | [7] = Filename that is displayed for the attachment |
386 | [8] = Sent if message was found from a search (where) |
387 | [9] = Sent if message was found from a search (what) |
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388 | |
389 | To set up links for actions, you assign them like this: |
390 | |
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391 | $Args[1]['<plugin_name>']['href'] = 'URL to link to'; |
392 | $Args[1]['<plugin_name>']['text'] = 'What to display'; |
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393 | |
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394 | It's also possible to specify a hook as "attachment type0/*", |
395 | for example "attachment text/*". This hook will be executed whenever there's |
396 | no more specific rule available for that type. |
397 | |
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398 | Putting all this together, the demo_handle_zip_attachment() function should |
399 | look like this (note the argument being passed): |
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400 | |
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401 | function demo_handle_zip_attachment(&$Args) |
402 | { |
403 | include_once(SM_PATH . 'plugins/demo/functions.php'); |
404 | demo_handle_zip_attachment_do($Args); |
405 | } |
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406 | |
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407 | And the demo_handle_zip_attachment_do() function in the |
408 | plugins/demo/functions.php file would typically (but not necessarily) |
409 | display a custom link: |
410 | |
411 | function demo_handle_zip_attachment_do(&$Args) |
412 | { |
413 | $Args[1]['demo']['href'] = SM_PATH . 'plugins/demo/zip_handler.php?' |
414 | . 'passed_id=' . $Args[3] . '&mailbox=' . $Args[4] |
415 | . '&passed_ent_id=' . $Args[5]; |
416 | $Args[1]['demo']['text'] = 'show zip contents'; |
417 | } |
418 | |
419 | The file plugins/demo/zip_handler.php can now do whatever it needs with the |
420 | attachment (note that this will hand information about how to retrieve the |
421 | source message from the IMAP server as GET varibles). |
422 | |
423 | |
424 | (*) Options |
425 | ----------- |
426 | Before you start adding user preferences to your plugin, please take a moment |
427 | to think about it: in some cases, more options may not be a good thing. |
428 | Having too many options can be confusing. Thinking from the user's |
429 | perspective, will the proposed options actually be used? Will users |
430 | understand what these options are for? |
431 | |
432 | There are two ways to add options for your plugin. When you only have a few |
433 | options that don't merit an entirely new preferences page, you can incorporate |
434 | them into an existing section of SquirrelMail preferences (Personal |
435 | Information, Display Preferences, Message Highlighting, Folder Preferences or |
436 | Index Order). Or, if you have an extensive number of settings or for some |
437 | reason need a separate page for the user to interact with, you can create your |
438 | own preferences page. |
439 | |
440 | |
441 | Integrating Your Options Into Existing SquirrelMail Preferences Pages |
442 | --------------------------------------------------------------------- |
443 | |
444 | There are two ways to accomplish the integration of your plugin's settings |
445 | into another preferences page. The first method is to add the HTML code |
446 | for your options directly to the preferences page of your choice. Although |
447 | currently very popular, this method will soon be deprecated, so avoid it |
448 | if you can. That said, here is how it works. :) Look for any of the hooks |
449 | named as "options_<pref page>_inside", where <pref page> is "display", |
450 | "personal", etc. For this example, we'll use "options_display_inside" and, |
451 | as above, "demo" as our plugin name: |
452 | |
453 | 1. In setup.php in the squirrelmail_plugin_init_demo() function: |
454 | |
455 | $squirrelmail_plugin_hooks['options_display_inside']['demo'] |
456 | = 'demo_show_options'; |
457 | |
458 | Note that there are also hooks such as "options_display_bottom", |
459 | however, they place your options at the bottom of the preferences |
460 | page, which is usually not desirable (mostly because they also |
461 | come AFTER the HTML FORM tag is already closed). It is possible |
462 | to use these hooks if you want to create your own FORM with custom |
463 | submission logic. |
464 | |
465 | 2. Assuming the function demo_show_options() calls another function |
466 | elsewhere called demo_show_options_do(), that function should have |
467 | output similar to this (note that you will be inserting code into |
468 | a table that is already defined with two columns, so please be sure |
469 | to keep this framework in your plugin): |
470 | |
471 | ------cut here------- |
472 | <tr> |
473 | <td> |
474 | OPTION_NAME |
475 | </td> |
476 | <td> |
477 | OPTION_INPUT |
478 | </td> |
479 | </tr> |
480 | ------cut here------- |
481 | |
482 | Of course, you can place any text where OPTION_NAME is and any input |
483 | tags where OPTION_INPUT is. |
484 | |
485 | 3. You will want to use the "options_<pref page>_save" hook (in this case, |
486 | "options_display_save") to save the user's settings after they have |
487 | pressed the "Submit" button. Again, back in setup.php in the |
488 | squirrelmail_plugin_init_demo() function: |
57945c53 |
489 | |
9cd2ae7d |
490 | $squirrelmail_plugin_hooks['options_display_save']['demo'] |
491 | = 'demo_save_options'; |
57945c53 |
492 | |
9cd2ae7d |
493 | 4. Assuming the function demo_save_options() calls another function |
494 | elsewhere called demo_save_options_do(), that function should put |
495 | the user's settings into permanent storage (see the preferences |
496 | section below for more information). This example assumes that |
497 | in the preferences page, the INPUT tag's NAME attribute was set |
498 | to "demo_option": |
499 | |
500 | global $data_dir, $username; |
501 | sqgetGlobalVar('demo_option', $demo_option); |
502 | setPref($data_dir, $username, 'demo_option', $demo_option); |
503 | |
504 | |
505 | The second way to add options to one of the SquirrelMail preferences page is |
506 | to use one of the "optpage_loadhook_<pref page>" hooks. The sent_subfolders |
507 | plugin is an excellent example of this method. Briefly, this way of adding |
508 | options consists of adding some plugin-specific information to a predefined |
509 | data structure which SquirrelMail then uses to build the HTML input forms |
510 | for you. This is the preferred method of building options lists going forward. |
511 | |
512 | 1. We'll use the "optpage_loadhook_display" hook to add a new group of |
513 | options to the display preferences page. In setup.php in the |
514 | squirrelmail_plugin_init_demo() function: |
515 | |
516 | $squirrelmail_plugin_hooks['optpage_loadhook_display']['demo'] |
517 | = 'demo_options'; |
518 | |
519 | 2. Assuming the function demo_options() calls another function elsewhere |
520 | called demo_options_do(), that function needs to add a new key to two |
521 | arrays, $optpage_data['grps'] and $optpage_data['vals']. The value |
522 | associated with that key should simply be a section heading for your |
523 | plugin on the preferences page for the $optpage_data['grps'] array, |
524 | and yet another array with all of your plugin's options for the |
525 | $optpage_data['vals'] array. The options are built as arrays (yes, |
526 | that's four levels of nested arrays) that specify attributes that are |
527 | used by SquirrelMail to build your HTML input tags automatically. |
528 | This example includes just one input element, a SELECT (drop-down) |
529 | list: |
530 | |
531 | global $optpage_data; |
532 | $optpage_data['grps']['DEMO_PLUGIN'] = 'Demo Options'; |
533 | $optionValues = array(); |
534 | $optionValues[] = array( |
535 | 'name' => 'plugin_demo_favorite_color', |
536 | 'caption' => 'Please Choose Your Favorite Color', |
537 | 'type' => SMOPT_TYPE_STRLIST, |
538 | 'refresh' => SMOPT_REFRESH_ALL, |
539 | 'posvals' => array(0 => 'red', |
540 | 1 => 'blue', |
541 | 2 => 'green', |
542 | 3 => 'orange'), |
543 | 'save' => 'save_plugin_demo_favorite_color' |
544 | ); |
545 | $optpage_data['vals']['DEMO_PLUGIN'] = $optionValues; |
546 | |
547 | The array that you use to specify each plugin option has the following |
548 | possible attributes: |
549 | |
6976aad7 |
550 | name The name of this setting, which is used not only for |
551 | the INPUT tag name, but also for the name of this |
552 | setting in the user's preferences |
553 | caption The text that prefaces this setting on the preferences |
554 | page |
555 | type The type of INPUT element, which should be one of: |
556 | SMOPT_TYPE_STRING String/text input |
557 | SMOPT_TYPE_STRLIST Select list input |
558 | SMOPT_TYPE_TEXTAREA Text area input |
559 | SMOPT_TYPE_INTEGER Integer input |
560 | SMOPT_TYPE_FLOAT Floating point number input |
561 | SMOPT_TYPE_BOOLEAN Boolean (yes/no radio buttons) |
562 | input |
563 | SMOPT_TYPE_HIDDEN Hidden input (not actually |
564 | shown on preferences page) |
565 | SMOPT_TYPE_COMMENT Text is shown (specified by the |
566 | 'comment' attribute), but no |
567 | user input is needed |
568 | SMOPT_TYPE_FLDRLIST Select list of IMAP folders |
569 | refresh Indicates if a link should be shown to refresh part or |
570 | all of the window (optional). Possible values are: |
571 | SMOPT_REFRESH_NONE No refresh link is shown |
572 | SMOPT_REFRESH_FOLDERLIST Link is shown to refresh |
573 | only the folder list |
574 | SMOPT_REFRESH_ALL Link is shown to refresh |
575 | the entire window |
576 | initial_value The value that should initially be placed in this |
577 | INPUT element |
578 | posvals For select lists, this should be an associative array, |
579 | where each key is an actual input value and the |
580 | corresponding value is what is displayed to the user |
581 | for that list item in the drop-down list |
582 | value Specify the default/preselected value for this option |
583 | input |
584 | save You may indicate that special functionality needs to be |
585 | used instead of just saving this setting by giving the |
586 | name of a function to call when this value would |
587 | otherwise just be saved in the user's preferences |
588 | size Specifies the size of certain input items (typically |
589 | textual inputs). Possible values are: |
590 | SMOPT_SIZE_TINY |
591 | SMOPT_SIZE_SMALL |
592 | SMOPT_SIZE_MEDIUM |
593 | SMOPT_SIZE_LARGE |
594 | SMOPT_SIZE_HUGE |
595 | SMOPT_SIZE_NORMAL |
596 | comment For SMOPT_TYPE_COMMENT type options, this is the text |
597 | displayed to the user |
598 | script This is where you may add any additional javascript |
599 | or other code to the user input |
600 | post_script You may specify some script (usually Javascript) that |
601 | will be placed after (outside of) the INPUT tag. |
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602 | |
603 | 3. If you indicated a 'save' attribute for any of your options, you must |
604 | create that function (you'll only need to do this if you need to do |
605 | some special processing for one of your settings). The function gets |
606 | one parameter, which is an object with mostly the same attributes you |
607 | defined when you made the option above... the 'new_value' (and possibly |
608 | 'value', which is the current value for this setting) is the most useful |
609 | attribute in this context: |
610 | |
611 | function save_plugin_demo_favorite_color($option) |
612 | { |
613 | // if user chose orange, make note that they are really dumb |
614 | if ($option->new_value == 3) |
615 | { |
616 | // more code here as needed |
617 | } |
618 | |
619 | // don't even save this setting if user chose green (old |
620 | // setting will remain) |
621 | if ($option->new_value == 2) |
622 | return; |
623 | |
624 | // for all other colors, save as normal |
625 | save_option($option); |
626 | } |
627 | |
628 | |
629 | Creating Your Own Preferences Page |
630 | ---------------------------------- |
631 | |
632 | It is also possible to create your own preferences page for a plugin. This |
633 | is particularly useful when your plugin has numerous options or needs to |
634 | offer special interaction with the user (for things such as changing password, |
635 | etc.). Here is an outline of how to do so (again, using the "demo" plugin |
636 | name): |
637 | |
638 | 1. Add a new listing to the main Options page. Older versions of |
639 | SquirrelMail offered a hook called "options_link_and_description" |
640 | although its use is deprecated (and it is harder to use in that |
641 | it requires you to write your own HTML to add the option). Instead, |
642 | you should always use the "optpage_register_block" hook where you |
643 | create a simple array that lets SquirrelMail build the HTML |
644 | to add the plugin options entry automatically. In setup.php in the |
645 | squirrelmail_plugin_init_demo() function: |
646 | |
647 | $squirrelmail_plugin_hooks['optpage_register_block']['demo'] |
648 | = 'demo_options_block'; |
649 | |
650 | 2. Assuming the function demo_options_block() calls another function |
651 | elsewhere called demo_options_block_do(), that function only needs |
652 | to create a simple array and add it to the $optpage_blocks array: |
653 | |
654 | global $optpage_blocks; |
655 | $optpage_blocks[] = array( |
656 | 'name' => 'Favorite Color Settings', |
657 | 'url' => SM_PATH . 'plugins/demo/options.php', |
658 | 'desc' => 'Change your favorite color & find new exciting colors', |
659 | 'js' => FALSE |
660 | ); |
661 | |
662 | The array should have four elements: |
663 | name The title of the plugin's options as it will be displayed on |
664 | the Options page |
665 | url The URI that points to your plugin's custom preferences page |
666 | desc A description of what the preferences page offers the user, |
667 | displayed on the Options page below the title |
668 | js Indicates if this option page requires the client browser |
669 | to be Javascript-capable. Should be TRUE or FALSE. |
670 | |
671 | 3. There are two different ways to create the actual preferences page |
672 | itself. One is to simply write all of your own HTML and other |
673 | interactive functionality, while the other is to define some data |
674 | structures that allow SquirrelMail to build your user inputs and save |
675 | your data automatically. |
676 | |
677 | Building your own page is wide open, and for ideas, you should look at |
678 | any of the plugins that currently have their own preferences pages. If |
679 | you do this, make sure to read step number 4 below for information on |
680 | saving settings. In order to maintain security, consistant look and |
681 | feel, internationalization support and overall integrity, there are just |
682 | a few things you should always do in this case: define the SM_PATH |
683 | constant, include the file include/validate.php (see the section about |
684 | including other files above) and make a call to place the standard page |
685 | heading at the top of your preferences page. The top of your PHP file |
686 | might look something like this: |
687 | |
688 | define('SM_PATH', '../../'); |
689 | include_once(SM_PATH . 'include/validate.php'); |
690 | global $color; |
691 | displayPageHeader($color, 'None'); |
692 | |
693 | From here you are on your own, although you are encouraged to do things |
694 | such as use the $color array to keep your HTML correctly themed, etc. |
695 | |
696 | If you want SquirrelMail to build your preferences page for you, |
697 | creating input forms and automatically saving users' settings, then |
698 | you should change the 'url' attribute in the options block you created |
699 | in step number 2 above to read as follows: |
700 | |
701 | 'url' => SM_PATH . 'src/options.php?optpage=plugin_demo', |
702 | |
703 | Now, you will need to use the "optpage_set_loadinfo" hook to tell |
704 | SquirrelMail about your new preferences page. In setup.php in the |
705 | squirrelmail_plugin_init_demo() function: |
57945c53 |
706 | |
9cd2ae7d |
707 | $squirrelmail_plugin_hooks['optpage_set_loadinfo']['demo'] |
708 | = 'demo_optpage_loadinfo'; |
709 | |
710 | Assuming the function demo_optpage_loadinfo() calls another function |
711 | elsewhere called demo_optpage_loadinfo_do(), that function needs to |
712 | define values for four variables (make sure you test to see that it |
713 | is your plugin that is being called by checking the GET variable you |
714 | added to the url just above): |
715 | |
716 | global $optpage, $optpage_name, $optpage_file, |
717 | $optpage_loader, $optpage_loadhook; |
718 | if ($optpage == 'plugin_demo') |
719 | { |
720 | $optpage_name = "Favorite Color Preferences"; |
721 | $optpage_file = SM_PATH . 'plugins/demo/options.php'; |
722 | $optpage_loader = 'load_optpage_data_demo'; |
723 | $optpage_loadhook = 'optpage_loadhook_demo'; |
724 | } |
725 | |
726 | Now you are ready to build all of your options. In the file you |
727 | indicated for the variable $optpage_file above, you'll need to create |
728 | a function named the same as the value you used for $optpage_loader |
729 | above. In this example, the file plugins/demo/options.php should |
730 | have at least this function in it: |
731 | |
732 | function load_optpage_data_demo() |
733 | { |
734 | $optpage_data = array(); |
735 | $optpage_data['grps']['DEMO_PLUGIN'] = 'Demo Options'; |
736 | $optionValues = array(); |
737 | $optionValues[] = array( |
738 | 'name' => 'plugin_demo_favorite_color', |
739 | 'caption' => 'Please Choose Your Favorite Color', |
740 | 'type' => SMOPT_TYPE_STRLIST, |
741 | 'refresh' => SMOPT_REFRESH_ALL, |
742 | 'posvals' => array(0 => 'red', |
743 | 1 => 'blue', |
744 | 2 => 'green', |
745 | 3 => 'orange'), |
746 | 'save' => 'save_plugin_demo_favorite_color' |
747 | ); |
748 | $optpage_data['vals']['DEMO_PLUGIN'] = $optionValues; |
749 | return $optpage_data; |
750 | } |
751 | |
752 | For a detailed description of how you build these options, please read |
753 | step number 2 for the second method of adding options to an existing |
754 | preferences page above. Notice that the only difference here is in the |
755 | very first and last lines of this function where you are actually |
756 | creating and returning the options array instead of just adding onto it. |
757 | |
758 | That's all there is to it - SquirrelMail will create a preferences page |
759 | titled as you indicated for $optpage_name above, and other plugins |
760 | can even add extra options to this new preferences page. To do so, |
761 | they should use the hook name you specified for $optpage_loadhook above |
762 | and use the second method for adding option settings to existing |
763 | preferences pages described above. |
764 | |
765 | 4. Saving your options settings: if you used the second method in step |
766 | number 3 above, your settings will be saved automatically (or you can |
767 | define special functions to save special settings such as the |
768 | save_plugin_demo_favorite_color() function in the example described |
769 | above) and there is probably no need to follow this step. If you |
770 | created your own preferences page from scratch, you'll need to follow |
771 | this step. First, you need to register your plugin against the |
772 | "options_save" hook. In setup.php in the squirrelmail_plugin_init_demo() |
773 | function: |
774 | |
775 | $squirrelmail_plugin_hooks['options_save']['demo'] |
776 | = 'demo_save_options'; |
777 | |
778 | Assuming the function demo_save_options() calls another function |
779 | elsewhere called demo_save_options_do(), that function needs to grab |
780 | all of your POST and/or GET settings values and save them in the user's |
781 | preferences (for more about preferences, see that section below). Since |
782 | this is a generic hook called for all custom preferences pages, you |
783 | should always set "optpage" as a POST or GET variable with a string that |
784 | uniquely identifies your plugin: |
785 | |
786 | <input type="hidden" name="optpage" value="plugin_demo"> |
787 | |
788 | Now in your demo_save_options_do() function, do something like this: |
789 | |
790 | global $username, $data_dir, $optpage, $favorite_color; |
791 | if ($optpage == 'plugin_demo') |
792 | { |
793 | sqgetGlobalVar('favorite_color', $favorite_color, SQ_FORM); |
794 | setPref($data_dir, $username, 'favorite_color', $favorite_color); |
795 | } |
796 | |
797 | Note that $favorite_color may not need to be globalized, although |
798 | experience has shown that some versions of PHP don't behave as expected |
799 | unless you do so. Even when you use SquirrelMail's built-in preferences |
800 | page generation functionality, you may still use this hook, although |
801 | there should be no need to do so. If you need to do some complex |
802 | validation routines, note that it might be better to do so in the file |
803 | you specified as the "$optpage_file" (in our example, that was the |
804 | plugins/demo/options.php file), since at this point, you can still |
805 | redisplay your preferences page. You could put code similar to this |
806 | in the plugins/demp/options.php file (note that there is no function; |
807 | this code needs to be executed at include time): |
808 | |
809 | global $optmode; |
810 | if ($optmode == 'submit') |
811 | { |
812 | // do something here such as validation, etc |
813 | if (you want to redisplay your preferences page) |
814 | $optmode = ''; |
815 | } |
816 | |
817 | |
818 | Preferences |
819 | ----------- |
820 | |
821 | Saving and retrieving user preferences is very easy in SquirrelMail. |
822 | SquirrelMail supports preference storage in files or in a database |
823 | backend, however, the code you need to write to manipulate preferences |
824 | is the same in both cases. |
825 | |
826 | Setting preferences: |
827 | |
828 | Setting preferences is done for you if you use the built-in facilities |
829 | for automatic options construction and presentation (see above). If |
830 | you need to manually set preferences, however, all you need to do is: |
831 | |
832 | global $data_dir, $username; |
833 | setPref($data_dir, $username, 'pref_name', $pref_value); |
834 | |
835 | Where "pref_name" is the key under which the value will be stored |
836 | and "pref_value" is a variable that should contain the actual |
837 | preference value to be stored. |
838 | |
839 | Loading preferences: |
840 | |
841 | There are two approaches to retrieving plugin (or any other) preferences. |
842 | You can grab individual preferences one at a time or you can add your |
843 | plugin's preferences to the routine that loads up user preferences at |
844 | the beginning of each page request. If you do the latter, making sure |
845 | to place your preference variables into the global scope, they will be |
846 | immediately available in all other plugin code. To retrieve a single |
847 | preference value at any time, do this: |
848 | |
849 | global $data_dir, $username; |
850 | $pref_value = getPref($data_dir, $username, 'pref_name', 'default value'); |
851 | |
852 | Where "pref_name" is the preference you are retrieving, "default_value" |
853 | is what will be returned if the preference is not found for this user, |
854 | and, of course, "pref_value" is the variable that will get the actual |
855 | preference value. |
856 | |
857 | To have all your preferences loaded at once when each page request is |
858 | made, you'll need to register a function against the "loading_prefs" hook. |
859 | For our "demo" plugin, in setup.php in the squirrelmail_plugin_init_demo() |
860 | function: |
861 | |
862 | $squirrelmail_plugin_hooks['loading_prefs']['demo'] |
863 | = 'demo_load_prefs'; |
864 | |
865 | Assuming the function demo_load_prefs() calls another function |
866 | elsewhere called demo_load_prefs_do(), that function just needs to |
867 | pull out any all all preferences you'll be needing elsewhere: |
868 | |
869 | global $data_dir, $username, $pref_value; |
870 | $pref_value = getPref($data_dir, $username, 'pref_name', 'default value'); |
871 | |
872 | Remember to globalize each preference, or this code is useless. |
873 | |
874 | |
875 | Internationalization |
876 | -------------------- |
877 | |
878 | Although this document may only be available in English, we sure hope that you |
879 | are thinking about making your plugin useful to the thousands of non-English |
880 | speaking SquirrelMail users out there! It is almost rude not to do so, and |
881 | it isn't much trouble, either. This document will only describe how you can |
882 | accomplish the internationalization of a plugin. For more general information |
883 | about PHP and SquirrelMail translation facilities, see: |
884 | |
885 | http://www.squirrelmail.org/wiki/wiki.php?LanguageTranslation |
886 | |
887 | The unofficial way to internationalize a plugin is to put all plugin output |
888 | into the proper format but to rely on the SquirrelMail translation facilities |
889 | for all the rest. If the plugin were really to get translated, you'd need |
890 | to make sure that all output strings for your plugin are either added to or |
891 | already exist in the main SquirrelMail locale files. |
892 | |
893 | The better way to make sure your plugin is translated is to create your own |
894 | locale files and what is called a "gettext domain" (see the link above for |
895 | more information). |
896 | |
897 | There are three basic steps to getting your plugins internationalized: put |
898 | all output into the proper format, switch gettext domains and create locale |
899 | files. |
900 | |
901 | 1. Putting plugin output into the correct format is quite easy. The hard |
902 | part is making sure you catch every last echo statement. You need to |
903 | echo text like this: |
904 | |
905 | echo _("Hello"); |
906 | |
907 | So, even in the HTML segments of your plugin files, you need to do this: |
908 | |
909 | <input type="submit" value="<?php echo _("Submit") ?>"> |
910 | |
911 | You can put any text you want inside of the quotes (you MUST use double |
912 | quotes!), including HTML tags, etc. What you should think carefully |
913 | about is that some languages may use different word ordering, so this |
914 | might be problematic: |
915 | |
916 | echo _("I want to eat a ") . $fruitName . _(" before noon"); |
917 | |
918 | Because some languages (Japanese, for instance) would need to translate |
919 | such a sentence to "Before noon " . $fruitName . " I want to eat", but |
920 | with the format above, they are stuck having to translate each piece |
921 | separately. You might want to reword your original sentence: |
922 | |
923 | echo _("This is what I want to eat before noon: ") . $fruitName; |
924 | |
925 | 2. By default, the SquirrelMail gettext domain is always in use. That |
926 | means that any text in the format described above will be translated |
927 | using the locale files found in the main SquirrelMail locale directory. |
928 | Unless your plugin produces no output or only output that is in fact |
929 | translated under the default SquirrelMail domain, you need to create |
930 | your own gettext domain. The PHP for doing so is very simple. At |
931 | the top of any file that produces any output, place the following code |
932 | (again, using "demo" as the plugin name): |
933 | |
934 | bindtextdomain('demo', SM_PATH . 'plugins/demo/locale'); |
935 | textdomain('demo'); |
936 | |
937 | Now all output will be translated using your own custom locale files. |
938 | Please be sure to switch back to the SquirrelMail domain at the end |
939 | of the file, or many of the other SquirrelMail files may misbehave: |
940 | |
941 | bindtextdomain('squirrelmail', SM_PATH . 'locale'); |
942 | textdomain('squirrelmail'); |
943 | |
944 | Note that if, in the middle of your plugin file, you use any |
945 | SquirrelMail functions that send output to the browser, you'll need |
946 | to temporarily switch back to the SquirrelMail domain: |
947 | |
948 | bindtextdomain('squirrelmail', SM_PATH . 'locale'); |
949 | textdomain('squirrelmail'); |
950 | displayPageHeader($color, 'None'); |
951 | bindtextdomain('demo', SM_PATH . 'plugins/demo/locale'); |
952 | textdomain('demo'); |
953 | |
954 | Note that technically speaking, you only need to have one bindtextdomain |
955 | call per file, you should always use it before every textdomain call, |
956 | since PHP installations without gettext compiled into them will not |
957 | function properly if you do not. |
958 | |
959 | 3. Finally, you just need to create your own locale. You should create |
960 | a directory structure like this in the plugin directory: |
961 | |
962 | demo |
963 | | |
964 | ------locale |
965 | | |
966 | ------de_DE |
967 | | | |
968 | | ------LC_MESSAGES |
969 | | |
970 | ------ja_JP |
971 | | |
972 | ------LC_MESSAGES |
973 | |
974 | Create a directories such as de_DE for each language (de_DE is German, |
975 | ja_JP is Japanese, etc. - check the SquirrelMail locale directory for |
976 | a fairly comprehensive listing). Inside of each LC_MESSAGES directory |
977 | you should place two files, one with your translations in it, called |
978 | <plugin name>.po (in this case, "demo.po"), and one that is a compiled |
979 | version of the ".po" file, called <plugin name>.mo (in this case, |
980 | "demo.mo"). On most linux systems, there is a tool you can use to pull |
981 | out most of the strings that you need to have translated from your PHP |
982 | files into a sample .po file: |
983 | |
984 | xgettext --keyword=_ -d <plugin name> -s -C *.php |
985 | |
986 | --keyword option tells xgettext what your strings are enclosed in |
987 | -d is the domain of your plugin which should be the plugin's name |
988 | -s tells xgettext to sort the results and remove duplicate strings |
989 | -C means you are translating a file with C/C++ type syntax (ie. PHP) |
990 | *.php is all the files you want translations for |
991 | |
992 | Note, however, that this will not always pick up all strings, so you |
993 | should double-check manually. Of course, it's easiest if you just keep |
994 | track of all your strings as you are coding your plugin. Your .po file |
995 | will now look something like: |
996 | |
997 | # SOME DESCRIPTIVE TITLE. |
998 | # Copyright (C) YEAR Free Software Foundation, Inc. |
999 | # FIRST AUTHOR <EMAIL@ADDRESS>, YEAR. |
1000 | # |
1001 | #, fuzzy |
1002 | msgid "" |
1003 | msgstr "" |
1004 | "Project-Id-Version: PACKAGE VERSION\n" |
1005 | "POT-Creation-Date: 2003-06-18 11:22-0600\n" |
1006 | "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n" |
1007 | "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n" |
1008 | "Language-Team: LANGUAGE <LL@li.org>\n" |
1009 | "MIME-Version: 1.0\n" |
1010 | "Content-Type: text/plain; charset=CHARSET\n" |
1011 | "Content-Transfer-Encoding: ENCODING\n" |
1012 | |
1013 | #: functions.php:45 |
1014 | msgid "Hello" |
1015 | msgstr "" |
1016 | |
1017 | #: functions.php:87 |
1018 | msgid "Favorite Color" |
1019 | msgstr "" |
1020 | |
1021 | You should change the header to look something more like: |
1022 | |
1023 | # Copyright (c) 1999-2003 The Squirrelmail Development Team |
1024 | # Roland Bauerschmidt <rb@debian.org>, 1999. |
1025 | msgid "" |
1026 | msgstr "" |
1027 | "Project-Id-Version: $Id: squirrelmail.po,v 1.10 2003/06/04 15:01:59 |
1028 | philippe_mingo Exp $\n" |
1029 | "POT-Creation-Date: 2003-01-21 19:21+0100\n" |
1030 | "PO-Revision-Date: 2003-01-21 21:01+0100\n" |
1031 | "Last-Translator: Juergen Edner <juergen.edner@epost.de>\n" |
1032 | "Language-Team: German <squirrelmail-i18n@lists.squirrelmail.net>\n" |
1033 | "MIME-Version: 1.0\n" |
1034 | "Content-Type: text/plain; charset=ISO-8859-1\n" |
1035 | "Content-Transfer-Encoding: 8bit\n" |
1036 | |
1037 | The most important thing to change here is the charset on the next to |
1038 | last line. You'll want to keep a master copy of the .po file and make |
1039 | a copy for each language you have a translation for. You'll need to |
1040 | translate each string in the .po file: |
1041 | |
1042 | msgid "Hello" |
1043 | msgstr "Guten Tag" |
1044 | |
1045 | After you're done translating, you can create the .mo file very simply |
1046 | by running the following command (available on most linux systems): |
1047 | |
d2b351d7 |
1048 | msgfmt -o <plugin name>.mo <plugin name>.po |
9cd2ae7d |
1049 | |
1050 | In the case of the "demo" plugin: |
1051 | |
d2b351d7 |
1052 | msgfmt -o demo.mo demo.po |
9cd2ae7d |
1053 | |
1054 | Please be sure that the .po and .mo files both are named exactly the |
1055 | same as the domain you bound in step 2 above and everything else works |
1056 | automatically. In SquirrelMail, go to Options -> Display Preferences |
1057 | and change your Language setting to see the translations in action! |
1058 | |
1059 | |
1060 | PLUGIN STANDARDS AND REQUIREMENTS |
1061 | ================================= |
1062 | |
1063 | The SquirrelMail project has some important goals, such as avoiding the |
1064 | use of JavaScript, avoiding non-standard HTML tags, keeping file sizes |
1065 | small and providing the fastest webmail client on the Internet. As such, |
1066 | we'd like it if plugin authors coded with the same goals in mind that the |
1067 | core developers do. Common sense is always a good tool to have in your |
1068 | programming repertoire, but below is an outline of some standards that we |
1069 | ask you as a plugin developer to meet. Depending upon how far you bend |
1070 | these rules, we may not want to post your plugin on the SquirrelMail |
1071 | website... and of course, no one really wants your efforts to go to waste |
1072 | and for the SquirrelMail community to miss out on a potentially useful |
1073 | plugin, so please try to follow these guidelines as closely as possible. |
1074 | |
1075 | |
1076 | Small setup.php |
1077 | --------------- |
1078 | |
1079 | In order for SquirrelMail to remain fast and lean, we are now asking |
1080 | that all plugin authors remove all unnecessary functionality from setup.php |
d2b351d7 |
1081 | and refactor it into another file. There are a few ways to accomplish |
9cd2ae7d |
1082 | this, none of which are difficult. At a minimum, you'll want to have the |
1083 | squirrelmail_plugin_init_<plugin name>() function in setup.php, and naturally, |
1084 | you'll need functions that are merely stubs for each hook that you are using. |
1085 | One (but not the only) way to do it is: |
1086 | |
1087 | function squirrelmail_plugin_init_demo() |
1088 | { |
1089 | global $squirrelmail_plugin_hooks; |
1090 | $squirrelmail_plugin_hooks['generic_header']['demo'] = 'plugin_demo_header'; |
1091 | } |
1092 | function plugin_demo_header() |
1093 | { |
1094 | include_once(SM_PATH . 'plugins/demo/functions.php'); |
1095 | plugin_demo_header_do(); |
1096 | } |
1097 | |
1098 | |
1099 | Internationalization |
1100 | -------------------- |
1101 | |
1102 | Q: What is more disappointing to users in France who would make good |
1103 | use of your plugin than learning that it is written entirely in English? |
1104 | A: Learning that they cannot send you a French translation file for your |
1105 | plugin. |
1106 | |
1107 | There are thousands of users out there whose native tongue is not English, |
1108 | and when you develop your plugin without going through the three simple steps |
1109 | needed to internationalize it, you are effectively writing them all off. |
1110 | PLEASE consider internationalizing your plugin! |
1111 | |
1112 | |
1113 | Developing with E_ALL |
1114 | --------------------- |
1115 | |
1116 | When you are developing your plugin, you should always have error reporting |
1117 | turned all the way up. You can do this by changing two settings in your |
1118 | php.ini and restarting your web server: |
1119 | |
799c2046 |
1120 | display_errors = On |
9cd2ae7d |
1121 | error_reporting = E_ALL |
1122 | |
1123 | This way, you'll be sure to see all Notices, Warnings and Errors that your |
1124 | code generates (it's OK, really, it happens to the best of us... except me!). |
1125 | Please make sure to fix them all before you release the plugin. |
1126 | |
1127 | |
1b6b1526 |
1128 | Compatibility with register_globals=Off |
1129 | --------------------------------------- |
1130 | |
1131 | Most sensible systems administrators now run their PHP systems with the |
1132 | setting "register_globals" as OFF. This is a prudent security setting, |
1133 | and as the SquirrelMail core code has long since been upgraded to work |
1134 | in such an environment, we are now requiring that all plugins do the same. |
1135 | Compatibility with this setting amounts to little more than explicitly |
1136 | gathering any and all variables you sent from a <form> tag as GET or POST |
1137 | values instead of just assuming that they will be placed in the global |
1138 | scope automatically. There is nothing more to do than this: |
1139 | |
1140 | global $favorite_color; |
1141 | sqgetGlobalVar('favorite_color', $favorite_color, SQ_FORM); |
1142 | |
1143 | |
9cd2ae7d |
1144 | Extra Blank Lines |
1145 | ----------------- |
1146 | |
1147 | It may seem innocuous, but if you have any blank lines either before the |
1148 | first <?php tag or after the last ?> tag in any of your plugin files, you |
1149 | you will break SquirrelMail in ways that may seem entirely unrelated. For |
1150 | instance, this will often cause a line feed character to be included with |
1151 | email attachments when they are viewed or downloaded, rendering them useless! |
1152 | |
1153 | |
1154 | include_once |
1155 | ------------ |
1156 | |
1157 | When including files, please make sure to use the include_once() function |
1158 | and NOT include(), require(), or require_once(), since these all are much |
1159 | less efficient than include_once() and can have a cumulative effect on |
1160 | SquirrelMail performance. |
1161 | |
1162 | |
1163 | Version Reporting |
1164 | ----------------- |
1165 | |
1166 | In order for systems administrators to keep better track of your plugin and |
1167 | get upgrades more efficiently, you are requested to make version information |
1168 | available to SquirrelMail in a format that it understands. There are two |
1169 | ways to do this. Presently, we are asking that you do both, since we are |
1170 | still in a transition period between the two. This is painless, so please |
1171 | be sure to include it: |
1172 | |
1173 | 1. Create a file called "version" in the plugin directory. That file |
1174 | should have only two lines: the first line should have the name of |
1175 | the plugin as named on the SquirrelMail web site (this is often a |
1176 | prettified version of the plugin directory name), the second line |
1177 | must have the version and nothing more. So for our "demo" plugin, |
1178 | whose name on the web site might be something like "Demo Favorite |
1179 | Colors", the file plugins/demo/version should have these two lines: |
1180 | |
1181 | Demo Favorite Colors |
1182 | 1.0 |
1183 | |
1184 | 2. In setup.php, you should have a function called <plugin name>_version(). |
1185 | That function should return the version of your plugin. For the "demo" |
1186 | plugin, that should look like this: |
1187 | |
1188 | function demo_version() |
1189 | { |
1190 | return '1.0'; |
1191 | } |
1192 | |
1193 | |
1194 | Configuration Files |
1195 | ------------------- |
1196 | |
1197 | It is common to need a configuration file that holds some variables that |
1198 | are set up at install time. For ease of installation and maintenance, you |
1199 | should place all behavioral settings in a config file, isolated from the |
1200 | rest of your plugin code. A typical file name to use is "config.php". If |
1201 | you are using such a file, you should NOT include a file called "config.php" |
1202 | in your plugin distribution, but instead a copy of that file called |
1203 | "config.php.sample". This helps systems administrators avoid overwriting |
1204 | the "config.php" files and losing all of their setup information when they |
1205 | upgrade your plugin. |
1206 | |
1207 | |
1208 | Session Variables |
1209 | ----------------- |
1210 | |
1211 | In the past, there have been some rather serious issues with PHP sessions |
1212 | and SquirrelMail, and certain people have worked long and hard to ensure |
1213 | that these problems no longer occur in an extremely wide variety of OS/PHP/ |
1214 | web server environments. Thus, if you need to place any values into the |
1215 | user's session, there are some built-in SquirrelMail functions that you are |
1216 | strongly encouraged to make use of. Using them also makes your job easier. |
1217 | |
1218 | 1. To place a variable into the session: |
1219 | |
1220 | global $favorite_color; |
1221 | $favoriteColor = 'green'; |
1222 | sqsession_register($favorite_color, 'favorite_color'); |
1223 | |
1224 | Strictly speaking, globalizing the variable shouldn't be necessary, |
1225 | but certain versions of PHP seem to behave more predictably if you do. |
1226 | |
1227 | 2. To retrieve a variable from the session: |
1228 | |
1229 | global $favorite_color; |
1230 | sqgetGlobalVar('favorite_color', $favorite_color, SQ_SESSION); |
1231 | |
1232 | 3. You can also check for the presence of a variable in the session: |
1233 | |
1234 | if (sqsession_is_registered('favorite_color')) |
1235 | // do something important |
1236 | |
1237 | 4. To remove a variable from the session: |
1238 | |
ea26c996 |
1239 | global $favorite_color; |
9cd2ae7d |
1240 | sqsession_unregister('favorite_color'); |
1241 | |
ea26c996 |
1242 | Strictly speaking, globalizing the variable shouldn't be necessary, |
1243 | but certain versions of PHP seem to behave more predictably if you do. |
1244 | |
9cd2ae7d |
1245 | |
1246 | Form Variables |
1247 | -------------- |
1248 | |
1249 | You are also encouraged to use SquirrelMail's built-in facilities to |
1250 | retrieve variables from POST and GET submissions. This is also much |
1251 | easier on you and makes sure that all PHP installations are accounted |
1252 | for (such as those that don't make the $_POST array automatically |
1253 | global, etc.): |
1254 | |
1255 | global $favorite_color; |
1256 | sqgetGlobalVar('favorite_color', $favorite_color, SQ_FORM); |
1257 | |
1258 | |
1259 | Files In Plugin Directory |
1260 | ------------------------- |
1261 | |
1262 | There are a few files that you should make sure to include when you build |
1263 | your final plugin distribution: |
1264 | |
1265 | 1. A copy of the file index.php from the main plugins directory. When |
1266 | working in your plugin directory, just copy it in like this: |
1267 | |
1268 | $ cp ../index.php . |
1269 | |
1270 | This will redirect anyone who tries to browse to your plugin directory |
1271 | to somewhere more appropriate. If you create other directories under |
1272 | your plugin directory, you may copy the file there as well to be extra |
1273 | safe. If you are storing sensitive configuration files or other data |
1274 | in such a directory, you could even include a .htaccess file with the |
1275 | contents "Deny From All" that will disallow access to that directory |
1276 | entirely (when the target system is running the Apache web server). |
1277 | Keep in mind that not all web servers will honor an .htaccess file, so |
1278 | don't depend on it for security. Make sure not to put such a file in |
1279 | your main plugin directory! |
1280 | |
1281 | 2. A file that describes your plugin and offers detailed instructions for |
1282 | configuration or help with troubleshooting, etc. This file is usually |
1283 | entitled "README". Some useful sections to include might be: |
1284 | |
1285 | Plugin Name and Author |
1286 | Current Version |
1287 | Plugin Features |
1288 | Detailed Plugin Description |
1289 | How-to for Plugin Configuration |
1290 | Change Log |
1291 | Future Ideas/Enhancements/To Do List |
1292 | |
1293 | 3. A file that explains how to install your plugin. This file is typically |
1294 | called "INSTALL". If you do not require any special installation |
1295 | actions, you can probably copy one from another plugin or use this as |
1296 | a template: |
1297 | |
1298 | Installing the Demo Plugin |
1299 | ========================== |
1300 | |
1301 | 1) Start with untaring the file into the plugins directory. |
1302 | Here is a example for the 1.0 version of the Demo plugin. |
1303 | |
1304 | $ cd plugins |
1305 | $ tar -zxvf demo-1.0-1.4.0.tar.gz |
1306 | |
1307 | 2) Change into the demo directory, copy config.php.sample |
1308 | to config.php and edit config.php, making adjustments as |
1309 | you deem necessary. For more detailed explanations about |
1310 | each of these parameters, consult the README file. |
1311 | |
1312 | $ cd demo |
1313 | $ cp config.php.sample config.php |
1314 | $ vi config.php |
1315 | |
1316 | |
1317 | 3) Then go to your config directory and run conf.pl. Choose |
1318 | option 8 and move the plugin from the "Available Plugins" |
1319 | category to the "Installed Plugins" category. Save and exit. |
1320 | |
1321 | $ cd ../../config/ |
1322 | $ ./conf.pl |
1323 | |
1324 | |
1325 | Upgrading the Demo Plugin |
1326 | ========================= |
1327 | |
1328 | 1) Start with untaring the file into the plugins directory. |
1329 | Here is a example for the 3.1 version of the demo plugin. |
1330 | |
1331 | $ cd plugins |
1332 | $ tar -zxvf demo-3.1-1.4.0.tar.gz |
1333 | |
1334 | |
1335 | 2) Change into the demo directory, check your config.php |
1336 | file against the new version, to see if there are any new |
1337 | settings that you must add to your config.php file. |
1338 | |
1339 | $ diff -Nau config.php config.php.sample |
1340 | |
1341 | Or simply replace your config.php file with the provided sample |
1342 | and reconfigure the plugin from scratch (see step 2 under the |
1343 | installation procedure above). |
1344 | |
1345 | |
1346 | COMPATIBILITY WITH OLDER VERSIONS OF SQUIRRELMAIL |
1347 | ================================================= |
1348 | |
1349 | Whenever new versions of SquirrelMail are released, there is always a |
1350 | considerable lag time before it is widely adopted. During that transitional |
1351 | time, especially when the new SquirrelMail version contains any architectural |
1352 | and/or functional changes, plugin developers are put in a unique and very |
1353 | difficult position. That is, there will be people running both the old and |
1354 | new versions of SquirrelMail who want to use your plugin, and you will |
1355 | probably want to accomodate them both. |
1356 | |
1357 | The easiest way to keep both sides happy is to keep two different versions |
1358 | of your pluign up to date, one that runs under the older SquirrelMail, and |
1359 | one that requires the newest SquirrelMail. This is inconvenient, however, |
1360 | especially if you are continuing to develop the plugin. Depending on the |
1361 | changes the SquirrelMail has implemented in the new version, you may be able |
1362 | to include code that can auto-sense SquirrelMail version and make adjustments |
1363 | on the fly. There is a function available to you for determining the |
1364 | SquirrelMail version called check_sm_version() and it can be used as such: |
1365 | |
1366 | check_sm_version(1, 4, 0) |
1367 | |
1368 | This will return TRUE if the SquirrelMail being used is at least 1.4.0, and |
1369 | FALSE otherwise. |
1370 | |
1371 | As this document is written, we are in a transition period between versions |
1372 | 1.2.11 and 1.4.0. There is a plugin called "Compatibilty" that is intended |
1373 | for use by plugin authors so they can develop one version of their plugin |
1374 | and seamlessly support both 1.2.x and 1.4.x SquirrelMail installations. For |
1375 | more information about how to use the "Compatibility" plugin, download it and |
1376 | read its README file or see: |
1377 | |
1378 | http://www.squirrelmail.org/wiki/wiki.php?PluginUpgrading |
1379 | |
1380 | |
1381 | REQUESTING NEW HOOKS |
1382 | ==================== |
1383 | |
1384 | It's impossible to foresee all of the places where hooks might be useful |
1385 | (it's also impossible to put in hooks everywhere!), so you might need to |
1386 | negotiate the insertion of a new hook to make your plugin work. In order |
1387 | to do so, you should post such a request to the squirrelmail-devel mailing |
1388 | list. |
1389 | |
1390 | |
1391 | HOW TO RELEASE YOUR PLUGIN |
1392 | ========================== |
1393 | |
1394 | As long as you've consulted the list of plugin standards and done your |
1395 | best to follow them, there's little standing in the way of great fame as an |
1396 | official SquirrelMail plugin developer. |
1397 | |
1398 | 1. Make a distribution file. There is a convenient Perl script in |
1399 | the plugins directory that will help you do this: |
1400 | |
1401 | make_archive.pl -v demo 1.0 1.4.0 |
1402 | |
1403 | -v is optional and indicates that the script should run in verbose mode |
1404 | demo is the name of your plugin |
1405 | 1.0 is the version of your plugin |
1406 | 1.4.0 is the version of SquirrelMail that is required to run your plugin |
1407 | |
1408 | You can also create the distribution file manually in most *nix |
1409 | environments by running this command from the plugins directory (NOT |
1410 | your plugin directory): |
1411 | |
1412 | $ tar czvf demo-1.0-1.4.0.tar.gz demo |
1413 | |
1414 | Where "demo" is the name of your plugin, "1.0" is the version of |
1415 | your plugin, and "1.4.0" is the version of SquirrelMail required |
1416 | to use your plugin. |
1417 | |
1418 | 2. Consult the SquirrelMail web site for contact information for the |
1419 | Plugins Team Leaders, to whom you should make your request. If they |
1420 | do not respond, you should feel free to ask for help contacting them |
1421 | on the squirrelmail-plugins mailing list. |
1422 | |
1423 | http://www.squirrelmail.org/wiki/wiki.php?SquirrelMailLeadership |
1424 | |