231 lines
7.4 KiB
PHP
231 lines
7.4 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 = $tfe->formatted;
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* \endcode
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*
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* An extension is something which is capable of reacting to events.
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*
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*
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* \page hello The Hello World Extension
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*
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* \code
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* // ext/hello/main.php
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* public class HelloEvent extends Event {
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* public function __construct($username) {
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* $this->username = $username;
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* }
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* }
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*
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* public class Hello extends Extension {
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* public function onPageRequest(PageRequestEvent $event) { // Every time a page request is sent
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* global $user; // Look at the global "currently logged in user" object
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* send_event(new HelloEvent($user->name)); // Broadcast a signal saying hello to that user
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* }
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* public function onHello(HelloEvent $event) { // When the "Hello" signal is recieved
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* $this->theme->display_hello($event->username); // Display a message on the web page
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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 function display_hello($username) {
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* global $page;
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* $h_user = html_escape($username); // Escape the data before adding it to the page
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* $block = new Block("Hello!", "Hello there $h_user"); // HTML-safe variables start with "h_"
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* $page->add_block($block); // Add the block to the page
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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 function testHello() {
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* $this->get_page("post/list"); // View a page, any page
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* $this->assert_text("Hello there"); // Check that the specified text is in that page
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* }
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* }
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*
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* // themes/mytheme/hello.theme.php
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* public class CustomHelloTheme extends HelloTheme { // CustomHelloTheme overrides HelloTheme
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* public function display_hello($username) { // the display_hello() function is customised
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* global $page;
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* $h_user = html_escape($username);
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* $page->add_block(new Block(
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* "Hello!",
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* "Hello there $h_user, look at my snazzy custom theme!"
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* );
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* }
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* }
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* \endcode
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*
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*/
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/**
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* send_event(BlahEvent()) -> onBlah($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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* The original concept came from Artanis's Extension 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 Extension {
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/** this theme's Themelet object */
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var $theme;
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/** @private */
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var $_child;
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// in PHP5.3, late static bindings can take care of this; __CLASS__
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// used here will refer to the subclass
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// http://php.net/manual/en/language.oop5.late-static-bindings.php
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/** @private */
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public function i_am(Extension $child) {
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$this->_child = $child;
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if(is_null($this->theme)) $this->theme = $this->get_theme_object($child, false);
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}
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/**
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* Find the theme object for a given extension
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*/
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private function get_theme_object(Extension $class, $fatal=true) {
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$base = get_class($class);
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if(class_exists('Custom'.$base.'Theme')) {
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$class = 'Custom'.$base.'Theme';
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return new $class();
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}
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elseif ($fatal || class_exists($base.'Theme')) {
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$class = $base.'Theme';
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return new $class();
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} else {
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return false;
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}
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}
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/**
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* Override this to change the priority of the extension,
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* lower numbered ones will recieve events first
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*/
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public function get_priority() {
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return 50;
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}
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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 extends Extension {
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public function onTextFormatting(TextFormattingEvent $event) {
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$event->formatted = $this->format($event->formatted);
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$event->stripped = $this->strip($event->stripped);
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}
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abstract public function format(/*string*/ $text);
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abstract public function strip(/*string*/ $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 extends Extension {
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public function onDataUpload(DataUploadEvent $event) {
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global $user;
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if($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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/* 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 = $image_id;
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}
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else {
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$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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$iae = new ImageAdditionEvent($image);
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send_event($iae);
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$event->image_id = $iae->image->id;
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// Rating Stuff.
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if(!empty($event->metadata['rating'])){
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$rating = $event->metadata['rating'];
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send_event(new RatingSetEvent($image, $rating));
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}
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// Locked Stuff.
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if(!empty($event->metadata['locked'])){
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$locked = $event->metadata['locked'];
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send_event(new LockSetEvent($image, !empty($locked)));
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}
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}
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}
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}
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public function onThumbnailGeneration(ThumbnailGenerationEvent $event) {
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if($this->supported_ext($event->type)) {
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if (method_exists($this, 'create_thumb_force') && $event->force == true) {
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$this->create_thumb_force($event->hash);
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}
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else {
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$this->create_thumb($event->hash);
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}
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}
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}
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public function onDisplayingImage(DisplayingImageEvent $event) {
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global $page;
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if($this->supported_ext($event->image->ext)) {
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$this->theme->display_image($page, $event->image);
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}
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}
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public function onSetupBuilding(SetupBuildingEvent $event) {
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$sb = $this->setup();
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if($sb) $event->panel->add_block($sb);
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}
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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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