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',
'PropertyValue' => 'schema:PropertyValue',
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'schema' => 'http://schema.org#',
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'value' => 'schema:value',
),
);
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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/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );
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$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' => $body,
);
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$response = \wp_safe_remote_post( $url, $args );
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\do_action( 'activitypub_safe_remote_post_response', $response, $url, $body, $user_id );
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return $response;
}
/**
* 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
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if ( \function_exists( '\get_webfinger_resource' ) ) {
return \get_webfinger_resource( $user_id, false );
}
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$user = \get_user_by( 'id', $user_id );
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return $user->user_login . '@' . \wp_parse_url( \home_url(), PHP_URL_HOST );
}
/**
* [get_metadata_by_actor description]
*
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* @param sting $actor
*
* @return array
*/
function get_remote_metadata_by_actor( $actor ) {
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$metadata = \get_transient( 'activitypub_' . $actor );
if ( $metadata ) {
return $metadata;
}
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if ( ! \wp_http_validate_url( $actor ) ) {
return new \WP_Error( 'activitypub_no_valid_actor_url', \__( 'The "actor" is no valid URL', 'activitypub' ), $actor );
}
// we just need any user to generate a request signature
$user_id = \reset( \get_users( array (
'number' => 1,
'who' => 'authors',
'fields' => 'ID'
) ) );
$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' );
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$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",
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'headers' => array(
'accept' => 'application/activity+json, application/ld+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
'Signature' => $signature,
'Date' => $date,
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),
);
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$response = \wp_safe_remote_get( $actor, $args );
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if ( \is_wp_error( $response ) ) {
return $response;
}
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$metadata = \wp_remote_retrieve_body( $response );
$metadata = \json_decode( $metadata, true );
if ( ! $metadata ) {
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return new \WP_Error( 'activitypub_invalid_json', \__( 'No valid JSON data', 'activitypub' ), $actor );
}
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\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( $actor ) {
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$metadata = \Activitypub\get_remote_metadata_by_actor( $actor );
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if ( \is_wp_error( $metadata ) ) {
return $metadata;
}
if ( isset( $metadata['endpoints'] ) && isset( $metadata['endpoints']['sharedInbox'] ) ) {
return $metadata['endpoints']['sharedInbox'];
}
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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, $key_id ) {
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$metadata = \Activitypub\get_remote_metadata_by_actor( $actor );
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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'];
}
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return new \WP_Error( 'activitypub_no_public_key', \__( 'No "Public-Key" found', 'activitypub' ), $metadata );
}
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function get_follower_inboxes( $user_id ) {
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$followers = \Activitypub\Peer\Followers::get_followers( $user_id );
$inboxes = array();
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foreach ( $followers as $follower ) {
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$inbox = \Activitypub\get_inbox_by_actor( $follower );
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if ( ! $inbox || \is_wp_error( $inbox ) ) {
continue;
}
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// init array if empty
if ( ! isset( $inboxes[ $inbox ] ) ) {
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$inboxes[ $inbox ] = array();
}
$inboxes[ $inbox ][] = $follower;
}
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return $inboxes;
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}
function get_identifier_settings( $user_id ) {
?>
<table class="form-table">
<tbody>
<tr>
<th scope="row">
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<label><?php \esc_html_e( 'Profile identifier', 'activitypub' ); ?></label>
</th>
<td>
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<p><code><?php echo \esc_html( \Activitypub\get_webfinger_resource( $user_id ) ); ?></code> or <code><?php echo \esc_url( \get_author_posts_url( $user_id ) ); ?></code></p>
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<?php // translators: the webfinger resource ?>
<p class="description"><?php \printf( \esc_html__( 'Try to follow "@%s" in the Mastodon/Friendica search field.', 'activitypub' ), \esc_html( \Activitypub\get_webfinger_resource( $user_id ) ) ); ?></p>
</td>
</tr>
</tbody>
</table>
<?php
}
function get_followers( $user_id ) {
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$followers = \Activitypub\Peer\Followers::get_followers( $user_id );
if ( ! $followers ) {
return array();
}
return $followers;
}
function count_followers( $user_id ) {
$followers = \Activitypub\get_followers( $user_id );
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return \count( $followers );
}
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/**
* Examine a url and try to determine the author ID it represents.
*
* Checks are supposedly from the hosted site blog.
*
* @param string $url Permalink to check.
*
* @return int User ID, or 0 on failure.
*/
function url_to_authorid( $url ) {
global $wp_rewrite;
// check if url hase the same host
if ( wp_parse_url( site_url(), PHP_URL_HOST ) !== wp_parse_url( $url, PHP_URL_HOST ) ) {
return 0;
}
// first, check to see if there is a 'author=N' to match against
if ( \preg_match( '/[?&]author=(\d+)/i', $url, $values ) ) {
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$id = absint( $values[1] );
if ( $id ) {
return $id;
}
}
// check to see if we are using rewrite rules
$rewrite = $wp_rewrite->wp_rewrite_rules();
// not using rewrite rules, and 'author=N' method failed, so we're out of options
if ( empty( $rewrite ) ) {
return 0;
}
// generate rewrite rule for the author url
$author_rewrite = $wp_rewrite->get_author_permastruct();
$author_regexp = \str_replace( '%author%', '', $author_rewrite );
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// match the rewrite rule with the passed url
if ( \preg_match( '/https?:\/\/(.+)' . \preg_quote( $author_regexp, '/' ) . '([^\/]+)/i', $url, $match ) ) {
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$user = get_user_by( 'slug', $match[2] );
if ( $user ) {
return $user->ID;
}
}
return 0;
}