Custom Plugin Autoupdate code example

Once the variables / constants are defined, as described on Custom Plugin integration with API calls a new variable constant is required, which is the current plugin code version. This will be compared with the version exists on the server, if there is a newer one, a data set is returned accordingly, otherwise a FALSE response will be output.

define('APTO_VERSION', '1.4.2');

A plugin auto-update code can be inserted within the plugin, here is an example:

class My_CodeAutoUpdate
    {
# URL to check for updates, this is where the index.php script goes
public $api_url;

# Type of package to be updated
public $package_type;

public $code_slug;
public $plugin_file;
public $current_version;

public function My_CodeAutoUpdate($api_url, $slug) 
    {
        $this->api_url          = $api_url;
        $this->package_type     = 'stable';
        $this->code_slug        = $slug;
        $this->plugin_file      = $slug .'/'. $slug . '.php';
        $this->current_version  = APTO_VERSION;
    }


public function check_for_plugin_update($checked_data) 
    {
        if (empty($checked_data->checked))
            return $checked_data;
        
        $request_args = array(
                                    'slug'          => $this->code_slug,
                                    'version'       => $checked_data->checked[$this->plugin_file],
                                    'package_type'  => $this->package_type,
                                );

        $request_string = $this->prepare_request('basic_check', $request_args);
        if($request_string === FALSE)
            return $checked_data; 
            
        // Start checking for an update
        $request_uri    = $this->api_url . '?' . http_build_query( $request_string ); 
        $data           = wp_remote_get( $request_uri );
    
        if(is_wp_error( $data ) || $data['response']['code'] != 200)
            return $checked_data;   
            
        $response = unserialize($data['body']);

        if (is_object($response) && !empty($response)) // Feed the update data into WP updater
            $checked_data->response[$this->plugin_file] = $response;
            
        return $checked_data;
    }

    
public function plugins_api_call($def, $action, $args) 
    {
        if (!is_object($args)  || !isset($args->slug) || $args->slug != $this->code_slug)
            return false;

        $args->version = $this->current_version;
        $args->package_type = $this->package_type;
        
        $request_string = $this->prepare_request($action, $args);
        if($request_string === FALSE)
            return new WP_Error('plugins_api_failed', __('An error occour when try to identify the pluguin.</p> <p><a href="?" onclick="document.location.reload(); return false;">Try again</a>'), $request->get_error_message());;
            
        $request_uri    = $this->api_url . '?' . http_build_query( $request_string ); 
        $data           = wp_remote_get( $request_uri );
    
        if(is_wp_error( $data ) || $data['response']['code'] != 200)
            $res = new WP_Error('plugins_api_failed', __('An Unexpected HTTP Error occurred during the API request.</p> <p><a href="?" onclick="document.location.reload(); return false;">Try again</a>'), $request->get_error_message());   
            
        $res = unserialize($data['body']);

         if ($res === false)
            $res = new WP_Error('plugins_api_failed', __('An unknown error occurred'), $request['body']);

        return $res;
    }

public function prepare_request($action, $args) 
    {

        global $wp_version;

        $wp_info = array(
                            'site-url'  => site_url(),
                            'version'   => $wp_version,
                        );

        $slug       = (is_object($args) && isset($args->slug)) ? $args->slug : $args['slug'];
        $version    = (is_object($args) && isset($args->version)) ? $args->version : $args['version'];
                        
        $license_data = get_site_option('apto_license');
            
        return array(
                        'sl_action'         =>  $action, 
                        'slug'              =>  $slug,
                        'version'           =>  APTO_VERSION,
                        'request'           =>  serialize($args),   
                        'product_id'        =>  APTO_PRODUCT_ID,
                        'licence_key'       =>  LICENSE_KEY,
                        'secret_key'        =>  APTO_SECRET_KEY,
                        'wp-version'        =>  $wp_version,
                        'domain'       =>  APTO_INSTANCE
        );
    }
    }

function My_run_updater()
    {
        $wp_plugin_auto_update = new My_CodeAutoUpdate(APTO_APP_API_URL, APTO_SLUG);
                        
        // Take over the update check
        add_filter('pre_set_site_transient_update_plugins', array($wp_plugin_auto_update, 'check_for_plugin_update'));

        // Take over the Plugin info screen
        add_filter('plugins_api', array($wp_plugin_auto_update, 'plugins_api_call'), 10, 3);
    }
add_action( 'after_setup_theme', 'My_run_updater' );