269 lines
8.8 KiB
PHP
269 lines
8.8 KiB
PHP
<?php
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/**
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* Parses post markup in order to use specified spee.ch url for assets
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*
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* @package LBRYPress
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*/
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class LBRY_Speech_Parser
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{
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// COMBAK: May not need this, as replace_attachment_image_src may cover all use cases
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/**
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* Replace img srcset attributes with Spee.ch urls
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* Check https://developer.wordpress.org/reference/functions/wp_calculate_image_srcset/ hook for details
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*/
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public function replace_image_srcset($sources, $size_array, $image_src, $image_meta, $attachment_id)
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{
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// If we don't have a speech URL, bail
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if (!LBRY()->speech->is_published($image_meta)) {
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return;
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}
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$new_sources = $sources;
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foreach ($sources as $width => $source) {
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if ($cropped_url = $this->get_speech_crop_url($source['url'], $image_meta)) {
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$new_sources[$width]['url'] = $cropped_url;
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}
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}
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return $new_sources;
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}
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/**
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* Replaces the output of the 'wp_get_attachment_image_src' function
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* Check https://developer.wordpress.org/reference/functions/wp_get_attachment_image_src/ for details
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*/
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public function replace_attachment_image_src($image, $attachment_id, $size)
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{
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if (!$image) {
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return $image;
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}
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$image_meta = wp_get_attachment_metadata($attachment_id);
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// Die if we don't have a speech_asset_url
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if (!LBRY()->speech->is_published($image_meta)) {
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return $image;
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}
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$new_image = $image;
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$cropped_url = $this->get_speech_crop_url($image[0], $image_meta);
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$new_image[0] = $cropped_url;
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return $new_image;
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}
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/**
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* Scrape content for urls that have a speech equivalent and replace
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* @param string $content The content to scrape
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* @return string The content with Spee.ch urls replaced
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*/
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// COMBAK: Need to make this a bit faster. Sitting between 100 and 300ms currently
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public function replace_urls_with_speech($content)
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{
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$new_content = $content;
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$assets = array();
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// Get Images
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$images = $this->scrape_images($content);
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foreach ($images as $image) {
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if ($src = $this->get_src_from_image_tag($image)) {
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$assets[] = $src;
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}
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}
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// Get Videos
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$videos = $this->scrape_videos($content);
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foreach ($videos as $video) {
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if ($src = $this->get_src_from_video_tag($video)) {
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$assets[] = $src;
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}
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}
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// Replace with Speech Urls
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foreach ($assets as $asset) {
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$id = $this->rigid_attachment_url_to_postid($asset);
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$meta = wp_get_attachment_metadata($id);
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if ($meta && LBRY()->speech->is_published($meta)) {
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// If its a video, handle accordingly
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if (!key_exists('file', $meta) && key_exists('mime_type', $meta) && $meta['mime_type'] == 'video/mp4') {
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$speech_url = $meta[LBRY_SPEECH_ASSET_URL];
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} else {
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$speech_url = $this->get_speech_crop_url($asset, $meta);
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}
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if ($speech_url) {
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$new_content = str_replace($asset, $speech_url, $new_content);
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}
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}
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}
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return $new_content;
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}
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/**
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* Calculates the crop url for Spee.ch to deliver responsive images
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* @param string $image_src The src of the image that needs a spee.ch url
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* @param array $image_meta The meta for the attachment that needs a spee.ch url
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* @return string The proper Spee.ch URL, false if none found
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*/
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private function get_speech_crop_url($image_src, $image_meta)
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{
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$base_url = wp_get_upload_dir()['baseurl'];
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$image_file_info = pathinfo($image_meta['file']);
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// If this is the base image, just return it as is
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if ($image_file_info['basename'] == pathinfo($image_src)['basename']) {
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return $image_meta[LBRY_SPEECH_ASSET_URL];
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}
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// Otherwise, find the crop size
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$comparable_url = $base_url . '/' . $image_file_info['dirname'] . '/' . $image_file_info['filename'];
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$crop_size = str_replace($comparable_url, '', $image_src);
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if (preg_match('/-(\d+)x(\d+)\..+/', $crop_size, $matches)) {
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return $image_meta[LBRY_SPEECH_ASSET_URL] . '?w=' . $matches[1] . '&h=' . $matches[2] . '&t=crop';
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}
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return false;
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}
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/**
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* Scrapes all image tags from content
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* @param string $content The content to scrape
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* @return array Array of image tags, empty if none found
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*/
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public function scrape_images($content)
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{
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// Return empty array if no images
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if (!$content) {
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return array();
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}
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// Find all images
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preg_match_all('/<img [^>]+>/', $content, $images);
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// Check to make sure we have results
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$images = empty($images[0]) ? array() : $images[0];
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return array_unique($images);
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}
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/**
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* Scrapes all video shortcodes from content
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* @param string $content The content to scrape
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* @return array Array of video tags, empty if none found
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*/
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public function scrape_videos($content)
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{
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// Return empty array if no videos
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if (!$content) {
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return array();
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}
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// Only MP4 videos for now
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preg_match_all('/\[video.*mp4=".*".*\]/', $content, $videos);
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$videos = empty($videos[0]) ? array() : $videos[0];
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return array_unique($videos);
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}
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/**
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* Retrives an attachment ID via an html tag
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* @param string $type Can be 'image' or 'mp4'
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* @param string $tag The Tag / shortcode to scrub for an ID
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* @return int|bool An ID if one is found, false otherwise
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*/
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public function get_attachment_id_from_tag($type, $tag)
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{
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$attachment_id = false;
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switch ($type) {
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case 'image':
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// Looks for wp image class first, if not, pull id from source
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if (preg_match('/wp-image-([0-9]+)/i', $tag, $class_id)) {
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$attachment_id = absint($class_id[1]);
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} elseif ($src = $this->get_src_from_image_tag($tag)) {
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$attachment_id = $this->rigid_attachment_url_to_postid($src);
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}
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break;
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case 'mp4':
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if ($src = $this->get_src_from_video_tag($tag)) {
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$attachment_id = $this->rigid_attachment_url_to_postid($src);
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}
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break;
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}
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return $attachment_id;
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}
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/**
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* Pulls src from image tag
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* @param string $image HTML Image tag
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* @return string The source if found and is a local source, otherwise false
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*/
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private function get_src_from_image_tag($image)
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{
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if (preg_match('/src="((?:https?:)?\/\/[^"]+)"/', $image, $src) && $src[1]) {
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if ($this->is_local($src[1])) {
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return $src[1];
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}
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}
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return false;
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}
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/**
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* Pulls src from video tag
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* @param string $video The video shortcode
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* @return string The source if found and is a local source, otherwise false
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*/
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private function get_src_from_video_tag($video)
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{
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if (preg_match('/mp4="((?:https?:)?\/\/[^"]+)"/', $video, $src) && $src[1]) {
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if ($this->is_local($src[1])) {
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return $src[1];
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}
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}
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return false;
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}
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/**
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* Checks to see if a url is local to this installation
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* @param string $url
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* @return boolean
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*/
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private function is_local($url)
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{
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if (strpos($url, home_url()) !== false) {
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return true;
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}
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}
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/**
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* Checks for image crop sizes and filters out query params
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* Courtesy of this post: http://bordoni.me/get-attachment-id-by-image-url/
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* @param string $url The url of the attachment you want an ID for
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* @return int The found post_id
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*/
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private function rigid_attachment_url_to_postid($url)
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{
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$scrubbed_url = strtok($url, '?'); // Clean up query params first
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$post_id = attachment_url_to_postid($scrubbed_url);
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if (! $post_id) {
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$dir = wp_upload_dir();
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$path = $scrubbed_url;
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if (0 === strpos($path, $dir['baseurl'] . '/')) {
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$path = substr($path, strlen($dir['baseurl'] . '/'));
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}
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if (preg_match('/^(.*)(\-\d*x\d*)(\.\w{1,})/i', $path, $matches)) {
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$url = $dir['baseurl'] . '/' . $matches[1] . $matches[3];
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$post_id = attachment_url_to_postid($url);
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}
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}
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return (int) $post_id;
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}
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}
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