Self hosted Auto update Custom WP Plugin or Theme - AKA Personal Wordpress Update Repository code example

Example: Self hosted Auto update Custom WP Plugin or Theme - AKA Personal Wordpress Update Repository

define( 'PREFIX_PLUGIN_VERSION', '1.7' );

###################
# Automatic updates
###################
/**
 * Pop-up with details about plugin update visible when there is a new release
 */

function prefix_plugin_info( $res, $action, $args ) {

    // do nothing if this is not about getting plugin information
    if ($action !== 'plugin_information') {
        return false;
    }

    // do nothing if it is not our plugin
    if ('pluginslug' !== $args->slug) {
        return $res;
    }

    // trying to get from cache first, to disable cache comment 23,33,34,35,36
    if (false == $remote = get_transient( 'prefix_upgrade_pluginslug' )) {

        // info.json is the file with the actual information about plug-in on your server
        $remote = wp_remote_get( 'https://www.example.com/foldername/get-info.php?slug=pluginslug&action=info', array(
            'timeout' => 10,
            'headers' => array(
                'Accept' => 'application/json'
            ))
        );

        if (!is_wp_error( $remote ) && isset( $remote[ 'response' ][ 'code' ] ) && $remote[ 'response' ][ 'code' ] == 200 && !empty( $remote[ 'body' ] )) {
            set_transient( 'prefix_upgrade_pluginslug', $remote, 21600 ); // 6 hours cache
        }
    }

    if (!is_wp_error( $remote )) {

        $remote = json_decode( $remote[ 'body' ] );

        $res = new stdClass();
        $res->name = $remote->name;
        $res->slug = $remote->slug;
        $res->version = $remote->version;
        $res->tested = $remote->tested;
        $res->requires = $remote->requires;
        $res->author = $remote->author;
        $res->author_profile = $remote->author_homepage;
        $res->download_link = $remote->download_link;
        $res->trunk = $remote->download_link;
        $res->last_updated = $remote->last_updated;
        $res->sections = array(
            'description' => $remote->sections->description, // description tab
            'installation' => $remote->sections->installation, // installation tab
                // you can add your custom sections (tabs) here like 'changelog'
        );
        $res->banners = array(
            'low' => $remote->banners->low,
            'high' => $remote->banners->high,
        );

        return $res;
    }

    return false;

}

add_filter( 'plugins_api', 'prefix_plugin_info', 20, 3 );