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Improve Addons documentation

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Hypolite Petovan 2018-07-14 13:50:57 -04:00
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doc/Addons.md
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@ -28,8 +28,7 @@ Addons should contain a comment block with the four following parameters:
Please also add a README or README.md file to the addon directory.
It will be displayed in the admin panel and should include some further information in addition to the header information.
PHP addon hooks
---
## PHP addon hooks
Register your addon hooks during installation.
@ -42,7 +41,7 @@ This *should* be 'addon/*addon_name*/*addon_name*.php' in most cases.
$function is a string and is the name of the function which will be executed when the hook is called.
#### Arguments
### Arguments
Your hook callback functions will be called with at least one and possibly two arguments
function myhook_function(App $a, &$b) {
@ -50,10 +49,10 @@ Your hook callback functions will be called with at least one and possibly two a
}
If you wish to make changes to the calling data, you must declare them as reference variables (with '&') during function declaration.
If you wish to make changes to the calling data, you must declare them as reference variables (with `&`) during function declaration.
##### $a
$a is the Friendica 'App' class.
#### $a
$a is the Friendica `App` class.
It contains a wealth of information about the current state of Friendica:
* which module has been called,
@ -61,54 +60,64 @@ It contains a wealth of information about the current state of Friendica:
* the page contents at the point the hook was invoked,
* profile and user information, etc.
It is recommeded you call this '$a' to match its usage elsewhere.
It is recommeded you call this `$a` to match its usage elsewhere.
##### $b
#### $b
$b can be called anything you like.
This is information specific to the hook currently being processed, and generally contains information that is being immediately processed or acted on that you can use, display, or alter.
Remember to declare it with '&' if you wish to alter it.
Remember to declare it with `&` if you wish to alter it.
JavaScript addon hooks
---
## JavaScript addon hooks
### PHP part
#### PHP part
Make sure your JavaScript addon file (addon/*addon_name*/*addon_name*.js) is listed in the document response.
In your addon install function, add:
Addon::registerHook('template_vars', 'addon/<addon_name>/<addon_name>.php', '<addon_name>_template_vars');
```php
Addon::registerHook('template_vars', __FILE__, '<addon_name>_template_vars');
```
In your addon uninstall function, add:
Addon::unregisterHook('template_vars', 'addon/<addon_name>/<addon_name>.php', '<addon_name>_template_vars');
```php
Addon::unregisterHook('template_vars', __FILE__, '<addon_name>_template_vars');
```
Then, add your addon name to the *addon_hooks* template variable array:
function <addon_name>_template_vars($a, &$arr)
{
if (!array_key_exists('addon_hooks',$arr['vars']))
{
$arr['vars']['addon_hooks'] = array();
}
$arr['vars']['addon_hooks'][] = "<addon_name>";
}
```php
function <addon_name>_template_vars($a, &$arr)
{
if (!array_key_exists('addon_hooks', $arr['vars']))
{
$arr['vars']['addon_hooks'] = array();
}
$arr['vars']['addon_hooks'][] = "<addon_name>";
}
```
#### JavaScript part
Register your addon hooks in file 'addon/*addon_name*/*addon_name*.js'.
### JavaScript part
Addon_registerHook(type,hookfnstr);
Register your addon hooks in file `addon/*addon_name*/*addon_name*.js`.
```js
Addon_registerHook(type, hookfnstr);
```
*type* is the name of the hook and corresponds to a known Friendica JavaScript hook.
*hookfnstr* is the name of your JavaScript function to execute.
No arguments are provided to your JavaScript callback function. Example:
function myhook_function() {
```javascript
function myhook_function() {
}
}
```
Modules
---
## Modules
Addons may also act as "modules" and intercept all page requests for a given URL path.
In order for a addon to act as a module it needs to define a function "addon_name_module()" which takes no arguments and needs not do anything.
@ -118,15 +127,16 @@ These are parsed into an array $a->argv, with a corresponding $a->argc indicatin
So http://my.web.site/addon/arg1/arg2 would look for a module named "addon" and pass its module functions the $a App structure (which is available to many components).
This will include:
$a->argc = 3
$a->argv = array(0 => 'addon', 1 => 'arg1', 2 => 'arg2');
```php
$a->argc = 3
$a->argv = array(0 => 'addon', 1 => 'arg1', 2 => 'arg2');
```
Your module functions will often contain the function addon_name_content(App $a), which defines and returns the page body content.
They may also contain addon_name_post(App $a) which is called before the _content function and typically handles the results of POST forms.
You may also have addon_name_init(App $a) which is called very early on and often does module initialisation.
Templates
---
## Templates
If your addon needs some template, you can use the Friendica template system.
Friendica uses [smarty3](http://www.smarty.net/) as a template engine.
@ -135,249 +145,253 @@ Put your tpl files in the *templates/* subfolder of your addon.
In your code, like in the function addon_name_content(), load the template file and execute it passing needed values:
# load template file. first argument is the template name,
# second is the addon path relative to friendica top folder
$tpl = get_markup_template('mytemplate.tpl', 'addon/addon_name/');
```php
# load template file. first argument is the template name,
# second is the addon path relative to friendica top folder
$tpl = get_markup_template('mytemplate.tpl', 'addon/addon_name/');
# apply template. first argument is the loaded template,
# second an array of 'name'=>'values' to pass to template
$output = replace_macros($tpl,array(
'title' => 'My beautiful addon',
));
# apply template. first argument is the loaded template,
# second an array of 'name' => 'values' to pass to template
$output = replace_macros($tpl, array(
'title' => 'My beautiful addon',
));
```
See also the wiki page [Quick Template Guide](https://github.com/friendica/friendica/wiki/Quick-Template-Guide).
Current PHP hooks
-------------
## Current PHP hooks
### 'authenticate'
'authenticate' is called when a user attempts to login.
$b is an array containing:
### authenticate
Called when a user attempts to login.
`$b` is an array containing:
'username' => the supplied username
'password' => the supplied password
'authenticated' => set this to non-zero to authenticate the user.
'user_record' => successful authentication must also return a valid user record from the database
- **username**: the supplied username
- **password**: the supplied password
- **authenticated**: set this to non-zero to authenticate the user.
- **user_record**: successful authentication must also return a valid user record from the database
### 'logged_in'
'logged_in' is called after a user has successfully logged in.
$b contains the $a->user array.
### logged_in
Called after a user has successfully logged in.
`$b` contains the `$a->user` array.
### 'display_item'
'display_item' is called when formatting a post for display.
### display_item
Called when formatting a post for display.
$b is an array:
'item' => The item (array) details pulled from the database
'output' => the (string) HTML representation of this item prior to adding it to the page
- **item**: The item (array) details pulled from the database
- **output**: the (string) HTML representation of this item prior to adding it to the page
### 'post_local'
* called when a status post or comment is entered on the local system
* $b is the item array of the information to be stored in the database
* Please note: body contents are bbcode - not HTML
### post_local
Called when a status post or comment is entered on the local system.
`$b` is the item array of the information to be stored in the database.
Please note: body contents are bbcode - not HTML.
### 'post_local_end'
* called when a local status post or comment has been stored on the local system
* $b is the item array of the information which has just been stored in the database
* Please note: body contents are bbcode - not HTML
### post_local_end
Called when a local status post or comment has been stored on the local system.
`$b` is the item array of the information which has just been stored in the database.
Please note: body contents are bbcode - not HTML
### 'post_remote'
* called when receiving a post from another source. This may also be used to post local activity or system generated messages.
* $b is the item array of information to be stored in the database and the item body is bbcode.
### post_remote
Called when receiving a post from another source. This may also be used to post local activity or system generated messages.
`$b` is the item array of information to be stored in the database and the item body is bbcode.
### 'settings_form'
* called when generating the HTML for the user Settings page
* $b is the (string) HTML of the settings page before the final '</form>' tag.
### settings_form
Called when generating the HTML for the user Settings page.
`$b` is the HTML string of the settings page before the final `</form>` tag.
### 'settings_post'
* called when the Settings pages are submitted
* $b is the $_POST array
### settings_post
Called when the Settings pages are submitted.
`$b` is the $_POST array.
### 'addon_settings'
* called when generating the HTML for the addon settings page
* $b is the (string) HTML of the addon settings page before the final '</form>' tag.
### addon_settings
Called when generating the HTML for the addon settings page.
`$b` is the (string) HTML of the addon settings page before the final `</form>` tag.
### 'addon_settings_post'
* called when the Addon Settings pages are submitted
* $b is the $_POST array
### addon_settings_post
Called when the Addon Settings pages are submitted.
`$b` is the $_POST array.
### 'profile_post'
* called when posting a profile page
* $b is the $_POST array
### profile_post
Called when posting a profile page.
`$b` is the $_POST array.
### 'profile_edit'
'profile_edit' is called prior to output of profile edit page.
$b is an array containing:
### profile_edit
Called prior to output of profile edit page.
`$b` is an array containing:
'profile' => profile (array) record from the database
'entry' => the (string) HTML of the generated entry
- **profile**: profile (array) record from the database
- **entry**: the (string) HTML of the generated entry
### 'profile_advanced'
* called when the HTML is generated for the 'Advanced profile', corresponding to the 'Profile' tab within a person's profile page
* $b is the (string) HTML representation of the generated profile
* The profile array details are in $a->profile.
### profile_advanced
Called when the HTML is generated for the Advanced profile, corresponding to the Profile tab within a person's profile page.
`$b` is the HTML string representation of the generated profile.
The profile array details are in `$a->profile`.
### 'directory_item'
'directory_item' is called from the Directory page when formatting an item for display.
### directory_item
Called from the Directory page when formatting an item for display.
`$b` is an array:
- **contact**: contact record array for the person from the database
- **entry**: the HTML string of the generated entry
### profile_sidebar_enter
Called prior to generating the sidebar "short" profile for a page.
`$b` is the person's profile array
### profile_sidebar
Called when generating the sidebar "short" profile for a page.
`$b` is an array:
- **profile**: profile record array for the person from the database
- **entry**: the HTML string of the generated entry
### contact_block_end
Called when formatting the block of contacts/friends on a profile sidebar has completed.
`$b` is an array:
- **contacts**: array of contacts
- **output**: the generated HTML string of the contact block
### bbcode
Called after conversion of bbcode to HTML.
`$b` is an HTML string converted text.
### html2bbcode
Called after tag conversion of HTML to bbcode (e.g. remote message posting)
`$b` is a string converted text
### page_header
Called after building the page navigation section.
`$b` is a string HTML of nav region.
### personal_xrd
Called prior to output of personal XRD file.
`$b` is an array:
- **user**: the user record array for the person
- **xml**: the complete XML string to be output
### home_content
Called prior to output home page content, shown to unlogged users.
`$b` is the HTML sring of section region.
### contact_edit
Called when editing contact details on an individual from the Contacts page.
$b is an array:
'contact' => contact (array) record for the person from the database
'entry' => the (string) HTML of the generated entry
- **contact**: contact record (array) of target contact
- **output**: the (string) generated HTML of the contact edit page
### 'profile_sidebar_enter'
* called prior to generating the sidebar "short" profile for a page
* $b is the person's profile array
### contact_edit_post
Called when posting the contact edit page.
`$b` is the `$_POST` array
### 'profile_sidebar'
'profile_sidebar is called when generating the sidebar "short" profile for a page.
$b is an array:
### init_1
Called just after DB has been opened and before session start.
No hook data.
'profile' => profile (array) record for the person from the database
'entry' => the (string) HTML of the generated entry
### page_end
Called after HTML content functions have completed.
`$b` is (string) HTML of content div.
### 'contact_block_end'
is called when formatting the block of contacts/friends on a profile sidebar has completed.
$b is an array:
### avatar_lookup
Called when looking up the avatar. `$b` is an array:
'contacts' => array of contacts
'output' => the (string) generated HTML of the contact block
- **size**: the size of the avatar that will be looked up
- **email**: email to look up the avatar for
- **url**: the (string) generated URL of the avatar
### 'bbcode'
* called during conversion of bbcode to html
* $b is a string converted text
### emailer_send_prepare
Called from `Emailer::send()` before building the mime message.
`$b` is an array of params to `Emailer::send()`.
### 'html2bbcode'
* called during conversion of html to bbcode (e.g. remote message posting)
* $b is a string converted text
- **fromName**: name of the sender
- **fromEmail**: email fo the sender
- **replyTo**: replyTo address to direct responses
- **toEmail**: destination email address
- **messageSubject**: subject of the message
- **htmlVersion**: html version of the message
- **textVersion**: text only version of the message
- **additionalMailHeader**: additions to the smtp mail header
### 'page_header'
* called after building the page navigation section
* $b is a string HTML of nav region
### emailer_send
Called before calling PHP's `mail()`.
`$b` is an array of params to `mail()`.
### 'personal_xrd'
'personal_xrd' is called prior to output of personal XRD file.
$b is an array:
- **to**
- **subject**
- **body**
- **headers**
'user' => the user record for the person
'xml' => the complete XML to be output
### nav_info
Called after the navigational menu is build in `include/nav.php`.
`$b` is an array containing `$nav` from `include/nav.php`.
### 'home_content'
* called prior to output home page content, shown to unlogged users
* $b is (string) HTML of section region
### 'contact_edit'
is called when editing contact details on an individual from the Contacts page.
$b is an array:
'contact' => contact record (array) of target contact
'output' => the (string) generated HTML of the contact edit page
### 'contact_edit_post'
* called when posting the contact edit page.
* $b is the $_POST array
### 'init_1'
* called just after DB has been opened and before session start
* $b is not used or passed
### 'page_end'
* called after HTML content functions have completed
* $b is (string) HTML of content div
### 'avatar_lookup'
'avatar_lookup' is called when looking up the avatar.
$b is an array:
'size' => the size of the avatar that will be looked up
'email' => email to look up the avatar for
'url' => the (string) generated URL of the avatar
### 'emailer_send_prepare'
'emailer_send_prepare' called from Emailer::send() before building the mime message.
$b is an array, params to Emailer::send()
'fromName' => name of the sender
'fromEmail' => email fo the sender
'replyTo' => replyTo address to direct responses
'toEmail' => destination email address
'messageSubject' => subject of the message
'htmlVersion' => html version of the message
'textVersion' => text only version of the message
'additionalMailHeader' => additions to the smtp mail header
### 'emailer_send'
is called before calling PHP's mail().
$b is an array, params to mail()
'to'
'subject'
'body'
'headers'
### 'nav_info'
is called after the navigational menu is build in include/nav.php.
$b is an array containing $nav from nav.php.
### 'template_vars'
is called before vars are passed to the template engine to render the page.
### template_vars
Called before vars are passed to the template engine to render the page.
The registered function can add,change or remove variables passed to template.
$b is an array with:
`$b` is an array with:
'template' => filename of template
'vars' => array of vars passed to template
- **template**: filename of template
- **vars**: array of vars passed to the template
### 'acl_lookup_end'
is called after the other queries have passed.
The registered function can add, change or remove the acl_lookup() variables.
### acl_lookup_end
Called after the other queries have passed.
The registered function can add, change or remove the `acl_lookup()` variables.
'results' => array of the acl_lookup() vars
- **results**: array of the acl_lookup() vars
### 'prepare_body_init'
### prepare_body_init
Called at the start of prepare_body
Hook data:
'item' => item array (input/output)
### 'prepare_body_content_filter'
- **item** (input/output): item array
### prepare_body_content_filter
Called before the HTML conversion in prepare_body. If the item matches a content filter rule set by an addon, it should
just add the reason to the filter_reasons element of the hook data.
Hook data:
'item' => item array (input)
'filter_reasons' => reasons array (input/output)
### 'prepare_body'
Called after the HTML conversion in prepare_body.
- **item**: item array (input)
- **filter_reasons** (input/output): reasons array
### prepare_body
Called after the HTML conversion in `prepare_body()`.
Hook data:
'item' => item array (input)
'html' => converted item body (input/output)
'is_preview' => post preview flag (input)
'filter_reasons' => reasons array (input)
### 'prepare_body_final'
Called at the end of prepare_body.
- **item** (input): item array
- **html** (input/output): converted item body
- **is_preview** (input): post preview flag
- **filter_reasons** (input): reasons array
### prepare_body_final
Called at the end of `prepare_body()`.
Hook data:
'item' => item array (input)
'html' => converted item body (input/output)
### 'put_item_in_cache'
Called after prepare_text in put_item_in_cache().
- **item**: item array (input)
- **html**: converted item body (input/output)
### put_item_in_cache
Called after `prepare_text()` in `put_item_in_cache()`.
Hook data:
'item' => item array (input)
'rendered-html' => final item body HTML (input/output)
'rendered-hash' => original item body hash (input/output)
### 'magic_auth_success'
- **item** (input): item array
- **rendered-html** (input/output): final item body HTML
- **rendered-hash** (input/output): original item body hash
### magic_auth_success
Called when a magic-auth was successful.
Hook data:
'visitor' => array with the contact record of the visitor
'url' => the query string
Current JavaScript hooks
-------------
visitor => array with the contact record of the visitor
url => the query string
### 'postprocess_liveupdate'
## Current JavaScript hooks
### postprocess_liveupdate
Called at the end of the live update process (XmlHttpRequest)
Complete list of hook callbacks
---
## Complete list of hook callbacks
Here is a complete list of all hook callbacks with file locations (as of 01-Apr-2018). Please see the source for details of any hooks not documented above.