Download latest version of a WordPress plugin

wp_download_plugin_latest.php

<?php

/**
 * Script to download latest version of a WordPress plugin .
 * This script must be in the folder where WordPress is installed.
 *
 * @param slug (name) of the plugin. See http://plugins.svn.wordpress.org/
 * @return exit code 0 if downloaded, 1 if already exists, 2 if error
 *
 * @author enekogb
 * 
 * TODO Improve
 */

if (! function_exists('plugins_api')) {
	require_once(dirname(__FILE__).'/wp-load.php');
	require_once(dirname(__FILE__).'/wp-admin/includes/plugin-install.php');
	require_once(dirname(__FILE__).'/wp-includes/http.php');
}

// Search plugin using WordPress api
// see http://code.tutsplus.com/tutorials/communicating-with-the-wordpressorg-plugin-api--wp-33069
$call_api = plugins_api('plugin_information', array('slug' => $argv[1]));

if (is_wp_error($call_api)) {
	echo 'Error getting '.$argv[1].' plugin info: '.print_r($call_api->get_error_message(), true);
	exit(2);
} else {
	// Get download link
	$url = $call_api -> download_link;

	// Extract filename
	$url_parts = parse_url($url);
	$file_name = dirname(__FILE__)."/wp-content/plugins/".basename($url_parts['path']);

	// Check file before download
	if (file_exists($file_name)) {
		echo "El plugin ya esta descargado en su ultima version: ".$file_name;
		exit(1);
	} else {
		// Get file from url
		$param = array( 'timeout' => 500000); // TODO Timeout as a parameter, more here: http://codex.wordpress.org/Function_Reference/wp_remote_get
		$response = wp_remote_get($url, $param);

		// Check error before saving to disk
		if (is_wp_error($response)) {
			echo 'Error downloading '.$url.' : '.print_r($response->get_error_message(), true);
			print_r($response, true);
			exit (2);
		} else {
			// Save file to disk and exit
			$zip =$response['body'];
			$fp = fopen($file_name, "w");
			fwrite($fp, $zip);
			fclose($fp);
			exit (0);
		}
	}
}
?>