dagsplug/plug_update_plugin.php

<?php

if (!class_exists("plug_update_plugin")) {
	class plug_update_plugin {
		function __construct($ns) {
			$this->title = __("Update plugin", "dagsopt");

			$this->pluginname = $ns->pluginname;
			$this->file = $ns->file;
			$this->ns = $ns;
			$this->status = "";
			$this->possible = false;
		}

		function start() {
			register_activation_hook(plugin_basename($this->file), array(&$this, 'activatePlugin'));
			register_deactivation_hook(plugin_basename($this->file), array(&$this, 'deactivatePlugin'));

			add_action($this->pluginname . 'UpdateCheck', array(&$this, 'check_update'));
			add_filter('http_request_args', array(&$this, 'updates_exclude'), 5, 2);
			if (isset($_REQUEST["checkforupdates"])) {
				$this->check_update();
			}
		}

		function activatePlugin() {
			wp_schedule_event(time(), 'hourly', $this->pluginname . 'UpdateCheck');
		}
		function deactivatePlugin() {
			wp_clear_scheduled_hook($this->pluginname . 'UpdateCheck');
		}

		/*SELF UPDATE*/
		function check_update() {
			global $wp_version;
			$plugin_folder = plugin_basename(dirname($this->file));
			$plugin_file = basename(($this->file));
			if (defined('WP_INSTALLING')) {
				return false;
			}

			$response = wp_remote_get($this->ns->update_check_url);
			list($version) = explode('|', $response['body']);
			$version = trim($version);
			$urlx = "https://git.tum.dk/tum.dk/dagsplug/archive/" . $version . ".zip";

			$this->status = 'Remote version: ' . $version . " URL: " . $urlx . ":::";

			$this->possible = false;
			if ($this->plugin_get("Version") == $version) {
				return false;
			}

			$this->possible = true;
			$plugin_transient = get_site_transient('update_plugins');
			$a = array(
				'slug' => $plugin_folder,
				'new_version' => $version,
				'url' => $this->plugin_get("AuthorURI"),
				'package' => $urlx,
			);
			$o = (object) $a;
			$plugin_transient->response[$plugin_folder . '/' . $plugin_file] = $o;
			set_site_transient('update_plugins', $plugin_transient);
		}
		function updates_exclude($r, $url) {
			if (0 !== strpos($url, 'http://api.wordpress.org/plugins/update-check')) {
				return $r;
			}
			// Not a plugin update request. Bail immediately.
			$plugins = unserialize($r['body']['plugins']);
			unset($plugins->plugins[plugin_basename($this->file)]);
			unset($plugins->active[array_search(plugin_basename($this->file), $plugins->active)]);
			$r['body']['plugins'] = serialize($plugins);
			return $r;
		}
		function plugin_get($i) {
			if (!function_exists('get_plugins')) {
				require_once ABSPATH . 'wp-admin/includes/plugin.php';
			}

			$plugin_folder = get_plugins('/' . plugin_basename(dirname($this->file)));
			$plugin_file = basename(($this->file));
			return $plugin_folder[$plugin_file][$i];
		}

		function admin_line() {
			?>
		  <a href="/wp-admin/admin.php?page=dagsopt-options&checkforupdates"><?php echo (__("Check for updates", "dagsopt")) ?></a>
		  <br>
		  <?php echo ($this->status); ?>

		  <?php

			if (current_user_can('update_plugins') && $this->possible) {
				$url = wp_nonce_url(self_admin_url('update.php?action=upgrade-plugin&plugin=' . $this->ns->filename), 'upgrade-plugin_' . $this->ns->filename);
				echo ('<a href="' . $url . '">' . __("Update", "dagsopt") . '</a>');
			}
			?>


		  <?php
}
	}

	global $plug_update_plugin;
	$plug_update_plugin = new plug_update_plugin($this);
	$this->dagsopt['plug_update_plugin'] = $plug_update_plugin;

}