205 lines
6.3 KiB
PHP
205 lines
6.3 KiB
PHP
<?php
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/**
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* \page eande Events and Extensions
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*
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* An event is a little blob of data saying "something happened", possibly
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* "something happened, here's the specific data". Events are sent with the
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* send_event() function. Since events can store data, they can be used to
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* return data to the extension which sent them, for example:
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*
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* \code
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* $tfe = new TextFormattingEvent($original_text);
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* send_event($tfe);
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* $formatted_text = $tfe->formatted;
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* \endcode
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*
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* An extension is something which is capable of reacting to events. They
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* register themselves using the add_event_listener() function, after which
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* events will be sent to the object's recieve_event() function.
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*
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* SimpleExtension subclasses are slightly different -- they are registered
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* automatically, and events are sent to a named method, eg PageRequestEvent
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* will be sent to onPageRequest()
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*
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*
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* \page hello The Hello World Extension
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*
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* \code
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* // ext/hello/main.php
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* public class Hello extends SimpleExtension {
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* public void onPageRequest(PageRequestEvent $event) {
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* global $page, $user;
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* $this->theme->display_hello($page, $user);
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* }
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* }
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*
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* // ext/hello/theme.php
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* public class HelloTheme extends Themelet {
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* public void display_hello(Page $page, User $user) {
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* $page->add_block(new Block("Hello!", "Hello there ".html_escape($user->name));
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* }
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* }
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*
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* // ext/hello/test.php
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* public class HelloTest extends SCoreWebTestCase {
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* public void testHello() {
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* $this->get_page("post/list");
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* $this->assert_text("Hello there");
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* }
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* }
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*
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* // themes/mytheme/hello.theme.php
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* public class CustomHelloTheme extends HelloTheme {
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* public function display_hello(Page $page, User $user) {
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* $h_user = html_escape($user->name);
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* $page->add_block(new Block(
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* "Hello!",
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* "Hello there $h_user, look at my snazzy custom theme!"
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* );
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* }
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* }
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* \endcode
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*
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*/
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/**
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* A generic extension class, for subclassing
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*/
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interface Extension {
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public function receive_event(Event $event);
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}
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/**
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* send_event(BlahEvent()) -> onBlah($event)
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*
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* Also loads the theme object into $this->theme if available
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*
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* index.php will load all SimpleExtension subclasses,
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* so no need for register_extension(new Foo())
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*
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* Automatic registration is done with priority returned by get_priority()
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*
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* Hopefully this removes as much copy & paste code from the extension
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* files as possible~
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*
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* The original concept came from Artanis's SimpleExtension extension
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* --> http://github.com/Artanis/simple-extension/tree/master
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* Then re-implemented by Shish after he broke the forum and couldn't
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* find the thread where the original was posted >_<
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*/
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abstract class SimpleExtension implements Extension {
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var $theme;
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var $_child;
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public function i_am($child) {
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$this->_child = $child;
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if(is_null($this->theme)) $this->theme = get_theme_object($child, false);
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}
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public function receive_event(Event $event) {
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$name = get_class($event);
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// this is rather clever..
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$name = "on".str_replace("Event", "", $name);
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if(method_exists($this->_child, $name)) {
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$this->_child->$name($event);
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}
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}
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public function get_priority() {return 50;}
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}
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/**
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* Several extensions have this in common, make a common API
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*/
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abstract class FormatterExtension implements Extension {
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public function receive_event(Event $event) {
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if($event instanceof TextFormattingEvent) {
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$event->formatted = $this->format($event->formatted);
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$event->stripped = $this->strip($event->stripped);
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}
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}
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abstract public function format($text);
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abstract public function strip($text);
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}
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/**
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* This too is a common class of extension with many methods in common,
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* so we have a base class to extend from
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*/
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abstract class DataHandlerExtension implements Extension {
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var $theme;
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public function receive_event(Event $event) {
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if(is_null($this->theme)) $this->theme = get_theme_object($this);
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if(($event instanceof DataUploadEvent) && $this->supported_ext($event->type) && $this->check_contents($event->tmpname)) {
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if(!move_upload_to_archive($event)) return;
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send_event(new ThumbnailGenerationEvent($event->hash, $event->type));
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/* Check if we are replacing an image */
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if (array_key_exists('replace',$event->metadata) && isset($event->metadata['replace']))
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{
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/* hax: This seems like such a dirty way to do this.. */
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/* Validate things */
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$image_id = int_escape($event->metadata['replace']);
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/* Check to make sure the image exists. */
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$existing = Image::by_id($image_id);
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if(is_null($existing)) {
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throw new UploadException("Image to replace does not exist!");
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}
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if ($existing->hash === $event->metadata['hash']) {
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throw new UploadException("The uploaded image is the same as the one to replace.");
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}
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// even more hax..
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$event->metadata['tags'] = $existing->get_tag_list();
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$image = $this->create_image_from_data(warehouse_path("images", $event->metadata['hash']), $event->metadata);
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if(is_null($image)) {
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throw new UploadException("Data handler failed to create image object from data");
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}
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$ire = new ImageReplaceEvent($image_id, $image);
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send_event($ire);
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$event->image_id = $image_id;
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}
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else
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{
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$image = $this->create_image_from_data(warehouse_path("images", $event->hash), $event->metadata);
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if(is_null($image)) {
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throw new UploadException("Data handler failed to create image object from data");
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}
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$iae = new ImageAdditionEvent($event->user, $image);
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send_event($iae);
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$event->image_id = $iae->image->id;
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}
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}
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if(($event instanceof ThumbnailGenerationEvent) && $this->supported_ext($event->type)) {
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$this->create_thumb($event->hash);
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}
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if(($event instanceof DisplayingImageEvent) && $this->supported_ext($event->image->ext)) {
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global $page;
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$this->theme->display_image($page, $event->image);
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}
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if(($event instanceof SetupBuildingEvent)) {
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$sb = $this->setup();
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if($sb) $event->panel->add_block($sb);
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}
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}
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protected function setup() {}
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abstract protected function supported_ext($ext);
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abstract protected function check_contents($tmpname);
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abstract protected function create_image_from_data($filename, $metadata);
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abstract protected function create_thumb($hash);
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}
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?>
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