lychee/docs/Plugins.md

About

The plugin-system of Lychee allows you to execute scripts, when a certain action fires. Plugins are hooks, which are injected directly into Lychee. They only affect the back-end and can't modify the front-end.

Use Cases

• Automatically watermark photos on upload
• Automatically set albums public
• Write metadata changes back to the original photo
• …

How to create a plugin

1. Create a folder in plugins/
2. Create an index.php within the new folder and with the following content:

<?php

###
# @name			ExamplePlugin
# @author		Tobias Reich
# @copyright	2014 by Tobias Reich
###

if (!defined('LYCHEE')) exit('Error: Direct access is not allowed!');

class ExamplePlugin implements SplObserver {

	private $database = null;
	private $settings = null;

	public function __construct($database, $settings) {

		# These params are passed to your plugin from Lychee
		# Save them to access the database and settings of Lychee
		$this->database = $database;
		$this->settings = $settings;
		
		# Add more code here if wanted
		# __construct() will be called every time Lychee gets called
		# Make sure this part is performant

		return true;

	}

	public function update(\SplSubject $subject) {

		# Check if the called hook is the hook you are waiting for
		# A list of all hooks is available online
		if ($subject->action!=='Photo::add:before') return false;

		# Do something when Photo::add:before gets called
		# $this->database => The database of Lychee
		# $this->settings => The settings of Lychee
		# $subject->args => Params passed to the original function
		
		return true;
		
	}

}

# Register your plugin
$plugins->attach(new ExamplePlugin($database, $settings));

3. Add the plugin-path to the database of Lychee

Select the table lychee_settings and edit the value of plugins to the path of your plugin. The path must be relative from the plugins/-folder: ExamplePlugin/index.php.

Divide multiple plugins with commas: Plugin01/index.php,Plugin02/index.php.

Available hooks

About :before and :after

Hooks named :before will be executed prior to the original function. Hooks named :after will be executed after the original function.

Album::add:before will be called when the user creates a new album in Lychee. The album doesn't exist at this moment. Album::add:after will be called after the album has been created.

Album

These hooks are called from php/modules/Album.php.

Name	Description
Album::add:before	User adds album
Album::add:after
Album::get:before	User opens album
Album::get:after
Album::getAll:before	User opens album overview
Album::getAll:after
Album::getArchive:before	User downloads album
Album::getArchive:after
Album::setTitle:before	User renames album
Album::setTitle:after
Album::setDescription:before	User sets description
Album::setDescription:after
Album::getPublic:before	User makes album public or private
Album::getPublic:after
Album::setPassword:before	User sets password
Album::setPassword:after
Album::checkPassword:before	Lychee checks if password is correct
Album::checkPassword:after
Album::delete:before	User deletes album
Album::delete:after

Photo

These hooks are called from php/modules/Photo.php.

Name	Description
Photo::add:before	User uploads photos
Photo::add:after
Photo::createThumb:before	Lychee creates thumbs
Photo::createThumb:after
Photo::adjustFile:before	Lychee adjusts files
Photo::adjustFile:after
Photo::get:before	User opens photo
Photo::get:after
Photo::getInfo:before	Lychee reads the metadata of an image
Photo::getInfo:after
Photo::getArchive:before	User downloads photo
Photo::getArchive:after
Photo::setTitle:before	User renames photo
Photo::setTitle:after
Photo::setDescription:before	User sets description
Photo::setDescription:after
Photo::setStar:before	User stars photo
Photo::setStar:after
Photo::getPublic:before	Lychee checks if photo is public
Photo::getPublic:after
Photo::setPublic:before	User shares photo
Photo::setPublic:after
Photo::setAlbum:before	User moves photo to album
Photo::setAlbum:after
Photo::setTags:before	User sets tags
Photo::setTags:after
Photo::delete:before	User deletes photo
Photo::delete:after

Session

These hooks are called from php/modules/Session.php.

Name	Description
Session::init:before	Someone opens Lychee
Session::init:after
Session::login:before	Someone logs in
Session::login:after
Session::logout:before	User logs out
Session::logout:after