wordpress-activitypub/includes/functions.php

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<?php
namespace Activitypub;
/**
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* Returns the ActivityPub default JSON-context
*
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* @return array the activitypub context
*/
function get_context() {
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$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 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 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 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 get_inbox_by_actor( $actor ) {
$metadata = 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 get_publickey_by_actor( $actor, $key_id ) {
$metadata = 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 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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}
function 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
}
function get_followers( $user_id ) {
$followers = \Activitypub\Db\Followers::get_followers( $user_id );
if ( ! $followers ) {
return array();
}
return $followers;
}
function count_followers( $user_id ) {
$followers = \Activitypub\get_followers( $user_id );
return count( $followers );
}