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<?php |
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/** |
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* |
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* Topic Image Preview. An extension for the phpBB Forum Software package. |
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* |
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* @copyright (c) 2017, Matt Friedman |
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* @license GNU General Public License, version 2 (GPL-2.0) |
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* |
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*/ |
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namespace vse\TopicImagePreview\event; |
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use phpbb\config\config; |
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use phpbb\db\driver\driver_interface; |
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use phpbb\user; |
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use Symfony\Component\EventDispatcher\EventSubscriberInterface; |
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/** |
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* Topic Image Preview Event listener. |
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*/ |
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class preview implements EventSubscriberInterface |
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{ |
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/** @var config */ |
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protected $config; |
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/** @var driver_interface */ |
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protected $db; |
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/** @var user */ |
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protected $user; |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function getSubscribedEvents() |
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{ |
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return [ |
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// Viewforum events |
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'core.viewforum_modify_topics_data' => 'update_row_data', |
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'core.viewforum_modify_topicrow' => 'update_tpl_data', |
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// Search events |
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'core.search_modify_rowset' => 'update_row_data', |
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'core.search_modify_tpl_ary' => 'update_tpl_data', |
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// Precise Similar Topics events |
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'vse.similartopics.modify_rowset' => 'update_row_data', |
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'vse.similartopics.modify_topicrow' => 'update_tpl_data', |
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]; |
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} |
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/** |
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* Constructor |
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* |
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* @param config $config |
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* @param driver_interface $db |
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* @param user $user |
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*/ |
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public function __construct(config $config, driver_interface $db, user $user) |
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{ |
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$this->config = $config; |
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$this->db = $db; |
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$this->user = $user; |
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} |
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/** |
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* Add post text containing images to topic row data. |
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* |
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* @param \phpbb\event\data $event The event object |
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* |
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* @return void |
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*/ |
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public function update_row_data($event) |
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{ |
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if (empty($this->user->data['user_vse_tip'])) |
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{ |
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return; |
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} |
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// Use topic_list from event, otherwise create one based on the rowset |
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$topic_list = $event->offsetExists('topic_list') ? $event['topic_list'] : array_keys($event['rowset']); |
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if (count($topic_list)) |
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{ |
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$event['rowset'] = $this->query_images($topic_list, $event['rowset']); |
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} |
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} |
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/** |
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* Add image previews to the template data. |
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* |
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* @param \phpbb\event\data $event The event object |
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* |
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* @return void |
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*/ |
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public function update_tpl_data($event) |
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{ |
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// Check if we have any post text or images |
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if (empty($this->user->data['user_vse_tip']) || empty($event['row']['post_text']) || !preg_match('/^<[r][ >]/', $event['row']['post_text']) || strpos($event['row']['post_text'], '<IMG ') === false) |
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{ |
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return; |
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} |
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// Send the image string to the template |
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$block = $event->offsetExists('topic_row') ? 'topic_row' : 'tpl_ary'; |
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$event[$block] = array_merge($event[$block], ['TOPIC_IMAGES' => $this->extract_images($event['row']['post_text'])]); |
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} |
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/** |
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* Run an SQL query on a group of topics, and find the newest (or oldest) |
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* post with [IMG] images. Then update the topic's row set array to include |
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* the post's text in the cases where images were found. |
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* |
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* @param array $topic_list An array of topic ids |
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* @param array $rowset The row set of topic data |
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* |
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* @return array The updated row set of topic data which now includes |
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* the post_text of a post containing images. |
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*/ |
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protected function query_images(array $topic_list, array $rowset) |
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{ |
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$sql_array = []; |
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foreach ($topic_list as $topic_id) |
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{ |
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$stmt = '(SELECT topic_id, post_text |
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FROM ' . POSTS_TABLE . ' |
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WHERE topic_id = ' . (int) $topic_id . ' |
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AND post_visibility = ' . ITEM_APPROVED . ' |
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AND post_text ' . $this->db->sql_like_expression('<r>' . $this->db->get_any_char() . '<IMG ' . $this->db->get_any_char()) . ' |
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ORDER BY post_time ' . ($this->config->offsetGet('vse_tip_new') ? 'DESC' : 'ASC') . ' |
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LIMIT 1)'; |
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// SQLite3 doesn't like ORDER BY with UNION ALL, so treat $stmt as derived table |
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if ($this->db->get_sql_layer() === 'sqlite3') |
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{ |
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$stmt = "SELECT * FROM $stmt AS d"; |
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} |
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$sql_array[] = $stmt; |
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} |
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$sql = implode(' UNION ALL ', $sql_array); |
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$result = $this->db->sql_query($sql); |
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while ($row = $this->db->sql_fetchrow($result)) |
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{ |
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$rowset[$row['topic_id']]['post_text'] = $row['post_text']; |
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} |
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$this->db->sql_freeresult($result); |
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return $rowset; |
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} |
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/** |
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* Extract images from a post and return them as HTML image tags. |
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* |
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* @param string $post Post text from the database. |
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* |
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* @return string An string of HTML IMG tags. |
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*/ |
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protected function extract_images($post) |
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{ |
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// Extract the images |
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$images = []; |
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$dom = new \DOMDocument; |
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$dom->loadXML($post); |
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$xpath = new \DOMXPath($dom); |
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foreach ($xpath->query('//IMG[not(ancestor::IMG)]/@src') as $image) |
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{ |
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$images[] = $image->textContent; |
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} |
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// Create a string of images |
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return implode(' ', array_map(function ($image) { |
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return "<img src='{$image}' alt='' style='max-width:{$this->config['vse_tip_dim']}px; max-height:{$this->config['vse_tip_dim']}px;' />"; |
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}, array_slice($images, 0, (int) $this->config['vse_tip_num'], true))); |
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} |
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} |
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iMattPro /
TopicImagePreview
