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