118 lines
3.8 KiB
PHP
118 lines
3.8 KiB
PHP
<?php
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/**
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* Name: Image Scores (Numeric)
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* Author: Shish <webmaster@shishnet.org>
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* License: GPLv2
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* Description: Allow users to score images
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* Documentation:
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* Each registered user may vote an image +1 or -1, the
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* image's score is the sum of all votes.
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*/
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class NumericScoreSetEvent extends Event {
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var $image_id, $user, $score;
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public function NumericScoreSetEvent($image_id, $user, $score) {
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$this->image_id = $image_id;
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$this->user = $user;
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$this->score = $score;
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}
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}
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class NumericScore implements Extension {
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var $theme;
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public function receive_event(Event $event) {
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global $config, $database, $page, $user;
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if(is_null($this->theme)) $this->theme = get_theme_object($this);
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if($event instanceof InitExtEvent) {
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if($config->get_int("ext_numeric_score_version", 0) < 1) {
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$this->install();
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}
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}
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if($event instanceof DisplayingImageEvent) {
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if(!$user->is_anonymous()) {
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$html = $this->theme->get_voter_html($event->image);
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$page->add_block(new Block("Image Score", $html, "left", 20));
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}
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}
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if(($event instanceof PageRequestEvent) && $event->page_matches("numeric_score_vote")) {
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if(!$user->is_anonymous()) {
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$image_id = int_escape($_POST['image_id']);
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$char = $_POST['vote'];
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$score = 0;
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if($char == "up") $score = 1;
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else if($char == "down") $score = -1;
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if($score != 0) send_event(new NumericScoreSetEvent($image_id, $user, $score));
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$page->set_mode("redirect");
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$page->set_redirect(make_link("post/view/$image_id"));
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}
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}
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if($event instanceof NumericScoreSetEvent) {
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$this->add_vote($event->image_id, $user->id, $event->score);
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}
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if($event instanceof ImageDeletionEvent) {
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$database->execute("DELETE FROM numeric_score_votes WHERE image_id=?", array($event->image->id));
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}
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if($event instanceof ParseLinkTemplateEvent) {
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$event->replace('$score', $event->image->numeric_score);
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}
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if($event instanceof SearchTermParseEvent) {
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$matches = array();
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if(preg_match("/^score(<|<=|=|>=|>)(\d+)$/", $event->term, $matches)) {
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$cmp = $matches[1];
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$score = $matches[2];
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$event->set_querylet(new Querylet("numeric_score $cmp $score"));
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}
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if(preg_match("/^favou?rite$/", $event->term, $matches)) {
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$event->set_querylet(new Querylet("images.id in (SELECT image_id FROM numeric_score_votes WHERE user_id=? AND score=1)", array($user->id)));
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}
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}
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}
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private function install() {
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global $database;
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global $config;
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if($config->get_int("ext_numeric_score_version") < 1) {
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$database->Execute("ALTER TABLE images ADD COLUMN numeric_score INTEGER NOT NULL DEFAULT 0");
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$database->Execute("CREATE INDEX images__numeric_score ON images(numeric_score)");
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$database->create_table("numeric_score_votes", "
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image_id INTEGER NOT NULL,
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user_id INTEGER NOT NULL,
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score INTEGER NOT NULL,
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UNIQUE(image_id, user_id),
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INDEX(image_id),
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FOREIGN KEY (image_id) REFERENCES images(id) ON DELETE CASCADE,
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FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
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");
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$config->set_int("ext_numeric_score_version", 1);
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}
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if($config->get_int("ext_numeric_score_version") < 2) {
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$database->Execute("CREATE INDEX numeric_score_votes__user_votes ON numeric_score_votes(user_id, score)");
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$config->set_int("ext_numeric_score_version", 2);
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}
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}
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private function add_vote($image_id, $user_id, $score) {
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global $database;
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$database->Execute(
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"DELETE FROM numeric_score_votes WHERE image_id=? AND user_id=?",
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array($image_id, $user_id));
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$database->Execute(
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"INSERT INTO numeric_score_votes(image_id, user_id, score) VALUES(?, ?, ?)",
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array($image_id, $user_id, $score));
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$database->Execute(
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"UPDATE images SET numeric_score=(SELECT SUM(score) FROM numeric_score_votes WHERE image_id=?) WHERE id=?",
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array($image_id, $image_id));
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}
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}
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add_event_listener(new NumericScore());
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?>
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