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< ? php
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/**
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* Returns the ActivityPub default JSON - context
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*
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* @ return array the activitypub context
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*/
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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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}
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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' );
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$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 ,
);
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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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function activitypub_get_identifier_settings ( $user_id ) {
?>
< table class = " form-table " >
< tbody >
< tr >
< th scope = " row " >
< label >< ? php esc_html_e ( 'Profile identifier' , 'activitypub' ); ?> </label>
</ th >
< td >
< p >< code >< ? php echo activitypub_get_webfinger_resource ( $user_id ); ?> </code> or <code><?php echo get_author_posts_url( $user_id ); ?></code></p>
< p class = " description " >< ? php printf ( __ ( 'Try to follow "@%s" in the mastodon/friendi.ca search field.' , 'activitypub' ), activitypub_get_webfinger_resource ( $user_id ) ); ?> </p>
</ td >
</ tr >
</ tbody >
</ table >
< ? php
}
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function activitypub_get_followers ( $user_id ) {
$followers = Db_Activitypub_Followers :: get_followers ( $user_id );
if ( ! $followers ) {
return array ();
}
return $followers ;
}
function activitypub_count_followers ( $user_id ) {
$followers = activitypub_get_followers ( $user_id );
return count ( $followers );
}