1 **Friendica Addon/Plugin development**
3 Please see the sample addon 'randplace' for a working example of using some of these features. The facebook addon provides an example of integrating both "addon" and "module" functionality. Addons work by intercepting event hooks - which must be registered. Modules work by intercepting specific page requests (by URL path).
6 Plugin names cannot contain spaces or other punctuation and are used as filenames and function names. You may supply a "friendly" name within the comment block. Each addon must contain both an install and an uninstall function based on the addon/plugin name. For instance "plugin1name_install()". These two functions take no arguments and are usually responsible for registering (and unregistering) event hooks that your plugin will require. The install and uninstall functions will also be called (i.e. re-installed) if the plugin changes after installation - therefore your uninstall should not destroy data and install should consider that data may already exist. Future extensions may provide for "setup" amd "remove".
8 Plugins should contain a comment block with the four following parameters:
11 * Name: My Great Plugin
12 * Description: This is what my plugin does. It's really cool
14 * Author: John Q. Public <john@myfriendicasite.com>
20 Register your plugin hooks during installation.
22 register_hook($hookname, $file, $function);
24 $hookname is a string and corresponds to a known Friendica hook.
26 $file is a pathname relative to the top-level Friendica directory. This *should* be 'addon/plugin_name/plugin_name.php' in most cases.
28 $function is a string and is the name of the function which will be executed when the hook is called.
31 Your hook callback functions will be called with at least one and possibly two arguments
34 function myhook_function(&$a, &$b) {
40 If you wish to make changes to the calling data, you must declare them as
41 reference variables (with '&') during function declaration.
43 $a is the Friendica 'App' class - which contains a wealth of information
44 about the current state of Friendica, such as which module has been called,
45 configuration info, the page contents at the point the hook was invoked, profile
46 and user information, etc. It is recommeded you call this '$a' to match its usage
49 $b can be called anything you like. This is information which is specific to the hook
50 currently being processed, and generally contains information that is being immediately
51 processed or acted on that you can use, display, or alter. Remember to declare it with
52 '&' if you wish to alter it.
56 Plugins/addons may also act as "modules" and intercept all page requests for a given URL path. In order for a plugin to act as a module it needs to define a function "plugin_name_module()" which takes no arguments and need not do anything.
58 If this function exists, you will now receive all page requests for "http://my.web.site/plugin_name" - with any number of URL components as additional arguments. These are parsed into an array $a->argv, with a corresponding $a->argc indicating the number of URL components. So http://my.web.site/plugin/arg1/arg2 would look for a module named "plugin" and pass its module functions the $a App structure (which is available to many components). This will include:
60 $a->argv = array(0 => 'plugin', 1 => 'arg1', 2 => 'arg2');
62 Your module functions will often contain the function plugin_name_content(&$a), which defines and returns the page body content. They may also contain plugin_name_post(&$a) which is called before the _content function and typically handles the results of POST forms. You may also have plugin_name_init(&$a) which is called very early on and often does module initialisation.
68 **'authenticate'** - called when a user attempts to login.
70 'username' => the supplied username
71 'password' => the supplied password
72 'authenticated' => set this to non-zero to authenticate the user.
73 'user_record' => successful authentication must also return a valid user record from the database
75 **'logged_in'** - called after a user has successfully logged in.
76 $b contains the $a->user array
79 **'display_item'** - called when formatting a post for display.
81 'item' => The item (array) details pulled from the database
82 'output' => the (string) HTML representation of this item prior to adding it to the page
84 **'post_local'** - called when a status post or comment is entered on the local system
85 $b is the item array of the information to be stored in the database
86 {Please note: body contents are bbcode - not HTML)
88 **'post_local_end'** - called when a local status post or comment has been stored on the local system
89 $b is the item array of the information which has just been stored in the database
90 {Please note: body contents are bbcode - not HTML)
92 **'post_remote'** - called when receiving a post from another source. This may also be used to post local activity or system generated messages.
93 $b is the item array of information to be stored in the database and the item
96 **'settings_form'** - called when generating the HTML for the user Settings page
97 $b is the (string) HTML of the settings page before the final '</form>' tag.
99 **'settings_post'** - called when the Settings pages are submitted.
100 $b is the $_POST array
102 **'plugin_settings'** - called when generating the HTML for the addon settings page
103 $b is the (string) HTML of the addon settings page before the final '</form>' tag.
105 **'plugin_settings_post'** - called when the Addon Settings pages are submitted.
106 $b is the $_POST array
108 **'profile_post'** - called when posting a profile page.
109 $b is the $_POST array
111 **'profile_edit'** - called prior to output of profile edit page
113 'profile' => profile (array) record from the database
114 'entry' => the (string) HTML of the generated entry
117 **'profile_advanced'** - called when the HTML is generated for the 'Advanced profile', corresponding to the 'Profile' tab within a person's profile page.
118 $b is the (string) HTML representation of the generated profile
119 (The profile array details are in $a->profile)
121 **'directory_item'** - called from the Directory page when formatting an item for display
123 'contact' => contact (array) record for the person from the database
124 'entry' => the (string) HTML of the generated entry
126 **'profile_sidebar_enter'** - called prior to generating the sidebar "short" profile for a page
127 $b is (array) the person's profile array
129 **'profile_sidebar'** - called when generating the sidebar "short" profile for a page
131 'profile' => profile (array) record for the person from the database
132 'entry' => the (string) HTML of the generated entry
134 **'contact_block_end'** - called when formatting the block of contacts/friends on a profile sidebar has completed
136 'contacts' => array of contacts
137 'output' => the (string) generated HTML of the contact block
139 **'bbcode'** - called during conversion of bbcode to html
140 $b is (string) converted text
142 **'html2bbcode'** - called during conversion of html to bbcode (e.g. remote message posting)
143 $b is (string) converted text
145 **'page_header'** - called after building the page navigation section
146 $b is (string) HTML of nav region
148 **'personal_xrd'** - called prior to output of personal XRD file.
150 'user' => the user record for the person
151 'xml' => the complete XML to be output
153 **'home_content'** - called prior to output home page content, shown to unlogged users
154 $b is (string) HTML of section region
156 **'contact_edit'** - called when editing contact details on an individual from the Contacts page
158 'contact' => contact record (array) of target contact
159 'output' => the (string) generated HTML of the contact edit page
161 **'contact_edit_post'** - called when posting the contact edit page
162 $b is the $_POST array
164 **'init_1'** - called just after DB has been opened and before session start
165 $b is not used or passed
167 **'page_end'** - called after HTML content functions have completed
168 $b is (string) HTML of content div
170 **'avatar_lookup'** - called when looking up the avatar
172 'size' => the size of the avatar that will be looked up
173 'email' => email to look up the avatar for
174 'url' => the (string) generated URL of the avatar
177 A complete list of all hook callbacks with file locations (generated 14-Feb-2012): Please see the source for details of any hooks not documented above.
180 boot.php: call_hooks('login_hook',$o);
182 boot.php: call_hooks('profile_sidebar_enter', $profile);
184 boot.php: call_hooks('profile_sidebar', $arr);
186 boot.php: call_hooks("proc_run", $arr);
188 include/contact_selectors.php: call_hooks('network_to_name', $nets);
190 include/api.php: call_hooks('logged_in', $a->user);
192 include/api.php: call_hooks('logged_in', $a->user);
194 include/queue.php: call_hooks('queue_predeliver', $a, $r);
196 include/queue.php: call_hooks('queue_deliver', $a, $params);
198 include/text.php: call_hooks('contact_block_end', $arr);
200 include/text.php: call_hooks('smilie', $s);
202 include/text.php: call_hooks('prepare_body_init', $item);
204 include/text.php: call_hooks('prepare_body', $prep_arr);
206 include/text.php: call_hooks('prepare_body_final', $prep_arr);
208 include/nav.php: call_hooks('page_header', $a->page['nav']);
210 include/auth.php: call_hooks('authenticate', $addon_auth);
212 include/bbcode.php: call_hooks('bbcode',$Text);
214 include/oauth.php: call_hooks('logged_in', $a->user);
216 include/acl_selectors.php: call_hooks($a->module . '_pre_' . $selname, $arr);
218 include/acl_selectors.php: call_hooks($a->module . '_post_' . $selname, $o);
220 include/acl_selectors.php: call_hooks('contact_select_options', $x);
222 include/acl_selectors.php: call_hooks($a->module . '_pre_' . $selname, $arr);
224 include/acl_selectors.php: call_hooks($a->module . '_post_' . $selname, $o);
226 include/acl_selectors.php: call_hooks($a->module . '_pre_' . $selname, $arr);
228 include/acl_selectors.php: call_hooks($a->module . '_post_' . $selname, $o);
230 include/notifier.php: call_hooks('notifier_normal',$target_item);
232 include/notifier.php: call_hooks('notifier_end',$target_item);
234 include/items.php: call_hooks('atom_feed', $atom);
236 include/items.php: call_hooks('atom_feed_end', $atom);
238 include/items.php: call_hooks('atom_feed_end', $atom);
240 include/items.php: call_hooks('parse_atom', $arr);
242 include/items.php: call_hooks('post_remote',$arr);
244 include/items.php: call_hooks('atom_author', $o);
246 include/items.php: call_hooks('atom_entry', $o);
248 include/bb2diaspora.php: call_hooks('bb2diaspora',$Text);
250 include/cronhooks.php: call_hooks('cron', $d);
252 include/security.php: call_hooks('logged_in', $a->user);
254 include/html2bbcode.php: call_hooks('html2bbcode', $text);
256 include/Contact.php: call_hooks('remove_user',$r[0]);
258 include/Contact.php: call_hooks('contact_photo_menu', $args);
260 include/conversation.php: call_hooks('conversation_start',$cb);
262 include/conversation.php: call_hooks('render_location',$locate);
264 include/conversation.php: call_hooks('display_item', $arr);
266 include/conversation.php: call_hooks('render_location',$locate);
268 include/conversation.php: call_hooks('display_item', $arr);
270 include/conversation.php: call_hooks('item_photo_menu', $args);
272 include/conversation.php: call_hooks('jot_tool', $jotplugins);
274 include/conversation.php: call_hooks('jot_networks', $jotnets);
276 include/plugin.php:if(! function_exists('call_hooks')) {
278 include/plugin.php:function call_hooks($name, &$data = null) {
280 index.php: call_hooks('init_1');
282 index.php:call_hooks('app_menu', $arr);
284 index.php:call_hooks('page_end', $a->page['content']);
286 mod/photos.php: call_hooks('photo_post_init', $_POST);
288 mod/photos.php: call_hooks('photo_post_file',$ret);
290 mod/photos.php: call_hooks('photo_post_end',$foo);
292 mod/photos.php: call_hooks('photo_post_end',$foo);
294 mod/photos.php: call_hooks('photo_post_end',$foo);
296 mod/photos.php: call_hooks('photo_post_end',intval($item_id));
298 mod/photos.php: call_hooks('photo_upload_form',$ret);
300 mod/friendica.php: call_hooks('about_hook', $o);
302 mod/editpost.php: call_hooks('jot_tool', $jotplugins);
304 mod/editpost.php: call_hooks('jot_networks', $jotnets);
306 mod/parse_url.php: call_hooks('parse_link', $arr);
308 mod/home.php: call_hooks('home_init',$ret);
310 mod/home.php: call_hooks("home_content",$o);
312 mod/contacts.php: call_hooks('contact_edit_post', $_POST);
314 mod/contacts.php: call_hooks('contact_edit', $arr);
316 mod/settings.php: call_hooks('plugin_settings_post', $_POST);
318 mod/settings.php: call_hooks('connector_settings_post', $_POST);
320 mod/settings.php: call_hooks('settings_post', $_POST);
322 mod/settings.php: call_hooks('plugin_settings', $settings_addons);
324 mod/settings.php: call_hooks('connector_settings', $settings_connectors);
326 mod/settings.php: call_hooks('settings_form',$o);
328 mod/register.php: call_hooks('register_account', $newuid);
330 mod/like.php: call_hooks('post_local_end', $arr);
332 mod/xrd.php: call_hooks('personal_xrd', $arr);
334 mod/item.php: call_hooks('post_local_start', $_REQUEST);
336 mod/item.php: call_hooks('post_local',$datarray);
338 mod/item.php: call_hooks('post_local_end', $datarray);
340 mod/profile.php: call_hooks('profile_advanced',$o);
342 mod/profiles.php: call_hooks('profile_post', $_POST);
344 mod/profiles.php: call_hooks('profile_edit', $arr);
346 mod/tagger.php: call_hooks('post_local_end', $arr);
348 mod/cb.php: call_hooks('cb_init');
350 mod/cb.php: call_hooks('cb_post', $_POST);
352 mod/cb.php: call_hooks('cb_afterpost');
354 mod/cb.php: call_hooks('cb_content', $o);
356 mod/directory.php: call_hooks('directory_item', $arr);