wordpress-activitypub/includes/functions.php

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<?php
/**
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* Returns the ActivityPub default JSON-context
*
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* @return array the activitypub context
*/
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function get_activitypub_context() {
$context = array(
'https://www.w3.org/ns/activitystreams',
'https://w3id.org/security/v1',
array(
'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
'sensitive' => 'as:sensitive',
'movedTo' => array(
'@id' => 'as:movedTo',
'@type' => '@id',
),
'Hashtag' => 'as:Hashtag',
'ostatus' => 'http://ostatus.org#',
'atomUri' => 'ostatus:atomUri',
'inReplyToAtomUri' => 'ostatus:inReplyToAtomUri',
'conversation' => 'ostatus:conversation',
'toot' => 'http://joinmastodon.org/ns#',
'Emoji' => 'toot:Emoji',
'focalPoint' => array(
'@container' => '@list',
'@id' => 'toot:focalPoint',
),
'featured' => array(
'@id' => 'toot:featured',
'@type' => '@id',
),
'schema' => 'http://schema.org#',
'PropertyValue' => 'schema:PropertyValue',
'value' => 'schema:value',
),
);
return apply_filters( 'activitypub_json_context', $context );
}
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function activitypub_safe_remote_post( $url, $body, $user_id ) {
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$date = gmdate( 'D, d M Y H:i:s T' );
$signature = Activitypub_Signature::generate_signature( $user_id, $url, $date );
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$wp_version = get_bloginfo( 'version' );
$user_agent = apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ) );
$args = array(
'timeout' => 100,
'limit_response_size' => 1048576,
'redirection' => 3,
'user-agent' => "$user_agent; ActivityPub",
'headers' => array(
'Accept' => 'application/activity+json',
'Content-Type' => 'application/activity+json',
'Signature' => $signature,
'Date' => $date,
),
'body' => $body,
);
return wp_safe_remote_post( $url, $args );
}
/**
* Returns a users WebFinger "resource"
*
* @param int $user_id
*
* @return string The user-resource
*/
function activitypub_get_webfinger_resource( $user_id ) {
// use WebFinger plugin if installed
if ( function_exists( 'get_webfinger_resource' ) ) {
return get_webfinger_resource( $user_id, false );
}
$user = get_user_by( 'id', $user_id );
return $user->user_login . '@' . wp_parse_url( home_url(), PHP_URL_HOST );
}
/**
* [get_metadata_by_actor description]
*
* @param [type] $actor [description]
* @return [type] [description]
*/
function activitypub_get_remote_metadata_by_actor( $actor ) {
$metadata = get_transient( 'activitypub_' . $actor );
if ( $metadata ) {
return $metadata;
}
if ( ! wp_http_validate_url( $actor ) ) {
return new WP_Error( 'activitypub_no_valid_actor_url', __( 'The "actor" is no valid URL', 'activitypub' ), $actor );
}
$wp_version = get_bloginfo( 'version' );
$user_agent = apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ) );
$args = array(
'timeout' => 100,
'limit_response_size' => 1048576,
'redirection' => 3,
'user-agent' => "$user_agent; ActivityPub",
'headers' => array( 'accept' => 'application/activity+json' ),
);
$response = wp_safe_remote_get( $actor, $args );
if ( is_wp_error( $response ) ) {
return $response;
}
$metadata = wp_remote_retrieve_body( $response );
$metadata = json_decode( $metadata, true );
if ( ! $metadata ) {
return new WP_Error( 'activitypub_invalid_json', __( 'No valid JSON data', 'activitypub' ), $actor );
}
set_transient( 'activitypub_' . $actor, $metadata, WEEK_IN_SECONDS );
return $metadata;
}
/**
* [get_inbox_by_actor description]
* @param [type] $actor [description]
* @return [type] [description]
*/
function activitypub_get_inbox_by_actor( $actor ) {
$metadata = activitypub_get_remote_metadata_by_actor( $actor );
if ( is_wp_error( $metadata ) ) {
return $metadata;
}
if ( isset( $metadata['endpoints'] ) && isset( $metadata['endpoints']['sharedInbox'] ) ) {
return $metadata['endpoints']['sharedInbox'];
}
if ( array_key_exists( 'inbox', $metadata ) ) {
return $metadata['inbox'];
}
return new WP_Error( 'activitypub_no_inbox', __( 'No "Inbox" found', 'activitypub' ), $metadata );
}
/**
* [get_inbox_by_actor description]
* @param [type] $actor [description]
* @return [type] [description]
*/
function activitypub_get_publickey_by_actor( $actor, $key_id ) {
$metadata = activitypub_get_remote_metadata_by_actor( $actor );
if ( is_wp_error( $metadata ) ) {
return $metadata;
}
if (
isset( $metadata['publicKey'] ) &&
isset( $metadata['publicKey']['id'] ) &&
isset( $metadata['publicKey']['owner'] ) &&
isset( $metadata['publicKey']['publicKeyPem'] ) &&
$key_id === $metadata['publicKey']['id'] &&
$actor === $metadata['publicKey']['owner']
) {
return $metadata['publicKey']['publicKeyPem'];
}
return new WP_Error( 'activitypub_no_public_key', __( 'No "Public-Key" found', 'activitypub' ), $metadata );
}
function activitypub_get_follower_inboxes( $user_id, $followers ) {
$inboxes = array();
foreach ( $followers as $follower ) {
$inboxes[] = activitypub_get_inbox_by_actor( $follower );
}
return array_unique( $inboxes );
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}
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/**
* Get the excerpt for a post for use outside of the loop.
*
* @param int|WP_Post $post ID or WP_Post object.
* @param int Optional excerpt length.
*
* @return string The excerpt.
*/
function activitypub_get_the_excerpt( $post, $excerpt_length = 55 ) {
$excerpt = get_post_field( 'post_excerpt', $post );
if ( '' === $excerpt ) {
$content = get_post_field( 'post_content', $post );
// An empty string will make wp_trim_excerpt do stuff we do not want.
if ( '' !== $content ) {
$excerpt = strip_shortcodes( $content );
/** This filter is documented in wp-includes/post-template.php */
$excerpt = apply_filters( 'the_content', $excerpt );
$excerpt = str_replace( ']]>', ']]>', $excerpt );
$excerpt_length = apply_filters( 'excerpt_length', $excerpt_length );
/** This filter is documented in wp-includes/formatting.php */
$excerpt_more = apply_filters( 'excerpt_more', ' […]' );
$excerpt = wp_trim_words( $excerpt, $excerpt_length, $excerpt_more );
}
}
return apply_filters( 'the_excerpt', $excerpt );
}