git-updater.php

<?php
/**
 * Github Updater Class
 */
class Github_Updater {

	private $file;

	private $plugin;

	private $basename;

	private $active;

	private $username;

	private $repository;

	private $authorize_token;

	private $github_response;

	public function __construct( $file ) {

		$this->file = $file;

		add_action( 'admin_init', array( $this, 'set_plugin_properties' ) );

		return $this;
	}

	public function set_plugin_properties() {
		$this->plugin	= get_plugin_data( $this->file );
		$this->basename = plugin_basename( $this->file );
		$this->active	= is_plugin_active( $this->basename );
	}

	public function set_username( $username ) {
		$this->username = $username;
	}

	public function set_repository( $repository ) {
		$this->repository = $repository;
	}

	public function authorize( $token ) {
		$this->authorize_token = $token;
	}

	private function get_repository_info() {
	    if ( is_null( $this->github_response ) ) { // Do we have a response?
	        $request_uri = sprintf( 'https://api.github.com/repos/%s/%s/releases', $this->username, $this->repository ); // Build URI

	        if( $this->authorize_token ) { // Is there an access token?
	            $request_uri = add_query_arg( 'access_token', $this->authorize_token, $request_uri ); // Append it
	        }

	        $git_response = json_decode( wp_remote_retrieve_body( wp_remote_get( $request_uri ) ), true ); // Get JSON and parse it

	        if( is_array( $git_response ) ) { // If it is an array
	            $git_response = current( $git_response ); // Get the first item
	        }

	        if( $this->authorize_token ) { // Is there an access token?
	            $git_response['zipball_url'] = add_query_arg( 'access_token', $this->authorize_token, $git_response['zipball_url'] ); // Update our zip url with token
	        }

	        $this->github_response = $git_response; // Set it to our property
	    }
	}

	public function initialize() {
		add_filter( 'pre_set_site_transient_update_plugins', array( $this, 'modify_transient' ), 10, 1 );
		add_filter( 'plugins_api', array( $this, 'plugin_popup' ), 10, 3);
		add_filter( 'upgrader_post_install', array( $this, 'after_install' ), 10, 3 );
	}

	public function modify_transient( $transient ) {

		if( property_exists( $transient, 'checked') ) { // Check if transient has a checked property

			if( $checked = $transient->checked ) { // Did Wordpress check for updates?

				$this->get_repository_info(); // Get the repo info

				$out_of_date = version_compare( $this->github_response['tag_name'], $checked[ $this->basename ], 'gt' ); // Check if we're out of date

				if( $out_of_date ) {

					$new_files = $this->github_response['zipball_url']; // Get the ZIP

					$slug = current( explode('/', $this->basename ) ); // Create valid slug

					// Setup plugin icons
					$plugin['icons'] = array();

					$plugin_icons = array(
						'svg' => plugin_dir_url( __FILE__ ) . 'assets/'.$slug.'-icon.svg', 
						'1x'  => plugin_dir_url( __FILE__ ) . 'assets/'.$slug.'-icon-128x128.png', 
						'2x'  => plugin_dir_url( __FILE__ ) . 'assets/'.$slug.'-icon-256x256.png',
					);

					// Setup our plugin info
					$plugin = array(
						'url' => $this->plugin['PluginURI'],
						'slug' => $slug,
      				    'icons' => $plugin_icons,
						'package' => $new_files,
						'new_version' => $this->github_response['tag_name']
					);

					$transient->response[$this->basename] = (object) $plugin; // Return it in response
				}
			}
		}

		return $transient; // Return filtered transient
	}

	public function plugin_popup( $result, $action, $args ) {

		if( ! empty( $args->slug ) ) { // If there is a slug
			
			if( $args->slug == current( explode( '/' , $this->basename ) ) ) { // And it's our slug

				$this->get_repository_info(); // Get our repo info

				// Set it to an array
				$plugin = array(
					'name'				=> $this->plugin['Name'],
					'slug'				=> $this->basename,
					'requires'			=> "3.8.0",
					'tested'			=> "4.9.2",
					'rating'			=> "100",
					'num_ratings'		=> "226",
					'downloaded'		=> $this->github_response['download_count'],
					'added'				=> $this->github_response['created_at'], //'2017-12-15',
					'version'			=> $this->github_response['tag_name'],
					'author'			=> $this->plugin['AuthorName'],
					'author_profile'	=> $this->plugin['AuthorURI'],
					'last_updated'		=> $this->github_response['published_at'],
					'homepage'			=> $this->plugin['PluginURI'],
					'short_description' => $this->plugin['Description'],
					'sections'			=> array(
						'description'	=> class_exists( 'Parsedown' ) ? Parsedown::instance()->parse( plugin_dir_url( __FILE__ ) . 'readme.txt' ) : $this->github_response['body'], 
						'changelog'		=> class_exists( 'Parsedown' ) ? Parsedown::instance()->parse( '<h3>' . $this->github_response['name'] . '</h3>' . '<br>' . $this->github_response['body'] ),
					),
					'banners'			=> array(
                  		'low'			=> plugin_dir_url( __FILE__ ) . 'assets/'.$slug.'-banner-772x250.png',
                  		'high'			=> plugin_dir_url( __FILE__ ) . 'assets/'.$slug.'-banner-1544x500.png',
      				),
					'download_link'		=> $this->github_response['zipball_url']
				);

				return (object) $plugin; // Return the data
			}

		}
		return $result; // Otherwise return default
	}


	public function after_install( $git_response, $hook_extra, $result ) {
		global $wp_filesystem; // Get global FS object

		$install_directory = plugin_dir_path( $this->file ); // Our plugin directory
		$wp_filesystem->move( $result['destination'], $install_directory ); // Move files to the plugin dir
		$result['destination'] = $install_directory; // Set the destination for the rest of the stack

		if ( $this->active ) { // If it was active
			activate_plugin( $this->basename ); // Reactivate
		}

		return $result;
	}
}