418 lines
12 KiB
PHP
418 lines
12 KiB
PHP
<?php
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namespace Activitypub\Model;
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/**
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* ActivityPub Post Class
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*
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* @author Matthias Pfefferle
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*/
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class Post {
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private $post;
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private $post_author;
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private $id;
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private $summary;
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private $content;
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private $attachments;
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private $tags;
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private $object_type;
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public function __construct( $post = null ) {
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$this->post = \get_post( $post );
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$this->post_author = $this->post->post_author;
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$this->id = $this->generate_id();
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$this->summary = $this->generate_the_title();
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$this->content = $this->generate_the_content();
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$this->attachments = $this->generate_attachments();
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$this->tags = $this->generate_tags();
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$this->object_type = $this->generate_object_type();
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}
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public function __call( $method, $params ) {
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$var = \strtolower( \substr( $method, 4 ) );
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if ( \strncasecmp( $method, 'get', 3 ) === 0 ) {
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return $this->$var;
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}
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if ( \strncasecmp( $method, 'set', 3 ) === 0 ) {
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$this->$var = $params[0];
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}
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}
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public function to_array() {
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$post = $this->post;
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$array = array(
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'id' => $this->id,
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'type' => $this->object_type,
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'published' => \gmdate( 'Y-m-d\TH:i:s\Z', \strtotime( $post->post_date_gmt ) ),
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'attributedTo' => \get_author_posts_url( $post->post_author ),
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'summary' => $this->summary,
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'inReplyTo' => null,
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'content' => $this->content,
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'contentMap' => array(
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\strstr( \get_locale(), '_', true ) => $this->content,
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),
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'to' => array( 'https://www.w3.org/ns/activitystreams#Public' ),
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'cc' => array( 'https://www.w3.org/ns/activitystreams#Public' ),
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'attachment' => $this->attachments,
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'tag' => $this->tags,
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);
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return \apply_filters( 'activitypub_post', $array );
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}
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public function to_json() {
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return \wp_json_encode( $this->to_array(), \JSON_HEX_TAG | \JSON_HEX_AMP | \JSON_HEX_QUOT );
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}
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public function generate_id() {
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$post = $this->post;
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if ( 'trash' === get_post_status( $post ) ) {
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$permalink = \get_post_meta( $post->ID, 'activitypub_canonical_url', true );
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} else {
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$permalink = \get_permalink( $post );
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}
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return $permalink;
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}
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public function generate_attachments() {
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$max_images = intval( \apply_filters( 'activitypub_max_image_attachments', \get_option( 'activitypub_max_image_attachments', ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS ) ) );
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$images = array();
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// max images can't be negative or zero
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if ( $max_images <= 0 ) {
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return $images;
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}
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$id = $this->post->ID;
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$image_ids = array();
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// list post thumbnail first if this post has one
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if ( \function_exists( 'has_post_thumbnail' ) && \has_post_thumbnail( $id ) ) {
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$image_ids[] = \get_post_thumbnail_id( $id );
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$max_images--;
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}
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if ( $max_images > 0 ) {
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// then list any image attachments
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$query = new \WP_Query(
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array(
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'post_parent' => $id,
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'post_status' => 'inherit',
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'post_type' => 'attachment',
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'post_mime_type' => 'image',
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'order' => 'ASC',
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'orderby' => 'menu_order ID',
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'posts_per_page' => $max_images,
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)
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);
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foreach ( $query->get_posts() as $attachment ) {
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if ( ! \in_array( $attachment->ID, $image_ids, true ) ) {
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$image_ids[] = $attachment->ID;
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}
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}
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}
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$image_ids = \array_unique( $image_ids );
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// get URLs for each image
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foreach ( $image_ids as $id ) {
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$alt = \get_post_meta( $id, '_wp_attachment_image_alt', true );
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$thumbnail = \wp_get_attachment_image_src( $id, 'full' );
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$mimetype = \get_post_mime_type( $id );
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if ( $thumbnail ) {
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$image = array(
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'type' => 'Image',
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'url' => $thumbnail[0],
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'mediaType' => $mimetype,
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);
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if ( $alt ) {
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$image['name'] = $alt;
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}
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$images[] = $image;
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}
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}
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return $images;
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}
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public function generate_tags() {
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$tags = array();
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$post_tags = \get_the_tags( $this->post->ID );
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if ( $post_tags ) {
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foreach ( $post_tags as $post_tag ) {
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$tag = array(
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'type' => 'Hashtag',
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'href' => \get_tag_link( $post_tag->term_id ),
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'name' => '#' . $post_tag->slug,
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);
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$tags[] = $tag;
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}
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}
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return $tags;
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}
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/**
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* Returns the as2 object-type for a given post
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*
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* @param string $type the object-type
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* @param Object $post the post-object
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*
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* @return string the object-type
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*/
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public function generate_object_type() {
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if ( 'wordpress-post-format' !== \get_option( 'activitypub_object_type', 'note' ) ) {
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return \ucfirst( \get_option( 'activitypub_object_type', 'note' ) );
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}
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$post_type = \get_post_type( $this->post );
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switch ( $post_type ) {
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case 'post':
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$post_format = \get_post_format( $this->post );
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switch ( $post_format ) {
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case 'aside':
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case 'status':
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case 'quote':
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case 'note':
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$object_type = 'Note';
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break;
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case 'gallery':
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case 'image':
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$object_type = 'Image';
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break;
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case 'video':
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$object_type = 'Video';
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break;
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case 'audio':
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$object_type = 'Audio';
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break;
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default:
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$object_type = 'Article';
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break;
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}
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break;
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case 'page':
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$object_type = 'Page';
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break;
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case 'attachment':
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$mime_type = \get_post_mime_type();
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$media_type = \preg_replace( '/(\/[a-zA-Z]+)/i', '', $mime_type );
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switch ( $media_type ) {
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case 'audio':
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$object_type = 'Audio';
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break;
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case 'video':
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$object_type = 'Video';
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break;
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case 'image':
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$object_type = 'Image';
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break;
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}
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break;
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default:
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$object_type = 'Article';
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break;
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}
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return $object_type;
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}
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public function generate_the_content() {
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$post = $this->post;
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$content = $this->get_post_content_template();
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$content = \str_replace( '%title%', \get_the_title( $post->ID ), $content );
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$content = \str_replace( '%excerpt%', $this->get_the_post_excerpt(), $content );
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$content = \str_replace( '%content%', $this->get_the_post_content(), $content );
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$content = \str_replace( '%permalink%', $this->get_the_post_link( 'permalink' ), $content );
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$content = \str_replace( '%shortlink%', $this->get_the_post_link( 'shortlink' ), $content );
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$content = \str_replace( '%hashtags%', $this->get_the_post_hashtags(), $content );
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// backwards compatibility
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$content = \str_replace( '%tags%', $this->get_the_post_hashtags(), $content );
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$content = \trim( \preg_replace( '/[\r\n]{2,}/', '', $content ) );
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$filtered_content = \apply_filters( 'activitypub_the_content', $content, $this->post );
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$decoded_content = \html_entity_decode( $filtered_content, \ENT_QUOTES, 'UTF-8' );
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$allowed_html = \apply_filters( 'activitypub_allowed_html', \get_option( 'activitypub_allowed_html', ACTIVITYPUB_ALLOWED_HTML ) );
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if ( $allowed_html ) {
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return \strip_tags( $decoded_content, $allowed_html );
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}
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return $decoded_content;
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}
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public function get_post_content_template() {
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if ( 'excerpt' === \get_option( 'activitypub_post_content_type', 'content' ) ) {
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return "%excerpt%\n\n<p>%permalink%</p>";
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}
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if ( 'title' === \get_option( 'activitypub_post_content_type', 'content' ) ) {
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return "<p><strong>%title%</strong></p>\n\n<p>%permalink%</p>";
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}
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if ( 'content' === \get_option( 'activitypub_post_content_type', 'content' ) ) {
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return "%content%\n\n<p>%hashtags%</p>\n\n<p>%permalink%</p>";
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}
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return \get_option( 'activitypub_custom_post_content', ACTIVITYPUB_CUSTOM_POST_CONTENT );
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}
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/**
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* Get the excerpt for a post for use outside of the loop.
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*
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* @param int Optional excerpt length.
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*
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* @return string The excerpt.
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*/
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public function get_the_post_excerpt( $excerpt_length = 400 ) {
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$post = $this->post;
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$excerpt = \get_post_field( 'post_excerpt', $post );
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if ( '' === $excerpt ) {
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$content = \get_post_field( 'post_content', $post );
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// An empty string will make wp_trim_excerpt do stuff we do not want.
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if ( '' !== $content ) {
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$excerpt = \strip_shortcodes( $content );
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/** This filter is documented in wp-includes/post-template.php */
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$excerpt = \apply_filters( 'the_content', $excerpt );
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$excerpt = \str_replace( ']]>', ']]>', $excerpt );
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}
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}
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// Strip out any remaining tags.
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$excerpt = \wp_strip_all_tags( $excerpt );
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/** This filter is documented in wp-includes/formatting.php */
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$excerpt_more = \apply_filters( 'excerpt_more', ' [...]' );
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$excerpt_more_len = strlen( $excerpt_more );
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// We now have a excerpt, but we need to check it's length, it may be longer than we want for two reasons:
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//
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// * The user has entered a manual excerpt which is longer that what we want.
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// * No manual excerpt exists so we've used the content which might be longer than we want.
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//
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// Either way, let's trim it up if we need too. Also, don't forget to take into account the more indicator
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// as part of the total length.
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//
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// Setup a variable to hold the current excerpts length.
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$current_excerpt_length = strlen( $excerpt );
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// Setup a variable to keep track of our target length.
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$target_excerpt_length = $excerpt_length - $excerpt_more_len;
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// Setup a variable to keep track of the current max length.
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$current_excerpt_max = $target_excerpt_length;
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// This is a loop since we can't calculate word break the string after 'the_excpert' filter has run (we would break
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// all kinds of html tags), so we have to cut the excerpt down a bit at a time until we hit our target length.
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while( $current_excerpt_length > $target_excerpt_length && $current_excerpt_max > 0 ) {
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// Trim the excerpt based on wordwrap() positioning.
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// Note: we're using <br> as the linebreak just in case there are any newlines existing in the excerpt from the user.
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// There won't be any <br> left after we've run wp_strip_all_tags() in the code above, so they're
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// safe to use here. It won't be included in the final excerpt as the substr() will trim it off.
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$excerpt = substr( $excerpt, 0, strpos( wordwrap( $excerpt, $current_excerpt_max, '<br>' ), '<br>' ) );
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// If something went wrong, or we're in a language that wordwrap() doesn't understand,
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// just chop it off and don't worry about breaking in the middle of a word.
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if( strlen( $excerpt ) > $excerpt_length - $excerpt_more_len ) {
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$excerpt = substr( $excerpt, 0, $current_excerpt_max );
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}
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// Add in the more indicator.
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$excerpt = $excerpt . $excerpt_more;
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// Run it through the excerpt filter which will add some html tags back in.
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$excerpt_filtered = apply_filters( 'the_excerpt', $excerpt );
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// Now set the current excerpt length to this new filtered length.
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$current_excerpt_length = strlen( $excerpt_filtered );
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// Check to see if we're over the target length.
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if( $current_excerpt_length > $target_excerpt_length ) {
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// If so, remove 20 characters from the current max and run the loop again.
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$current_excerpt_max = $current_excerpt_max - 20;
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}
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}
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return \apply_filters( 'the_excerpt', $excerpt );
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}
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/**
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* Get the content for a post for use outside of the loop.
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*
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* @return string The content.
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*/
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public function get_the_post_content() {
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$post = $this->post;
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$content = \get_post_field( 'post_content', $post );
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return \apply_filters( 'the_content', $content );
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}
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/**
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* Adds a backlink to the post/summary content
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*
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* @param string $content
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* @param WP_Post $post
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*
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* @return string
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*/
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public function get_the_post_link( $type = 'permalink' ) {
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$post = $this->post;
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if ( 'shortlink' === $type ) {
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$link = \esc_url( \wp_get_shortlink( $post->ID ) );
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} elseif ( 'permalink' === $type ) {
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$link = \esc_url( \get_permalink( $post->ID ) );
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} else {
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return '';
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}
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return \sprintf( '<a href="%1$s">%1$s</a>', $link );
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}
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/**
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* Adds all tags as hashtags to the post/summary content
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*
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* @param string $content
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* @param WP_Post $post
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*
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* @return string
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*/
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public function get_the_post_hashtags() {
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$post = $this->post;
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$tags = \get_the_tags( $post->ID );
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if ( ! $tags ) {
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return '';
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}
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$hash_tags = array();
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foreach ( $tags as $tag ) {
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$hash_tags[] = \sprintf( '<a rel="tag" class="u-tag u-category" href="%s">#%s</a>', \get_tag_link( $tag ), $tag->slug );
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}
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return \implode( ' ', $hash_tags );
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}
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}
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