Assert.php

<?php
require_once dirname(__FILE__) . "/modules/HttpException/HttpException.php";
class Assert
{
	public static function RequestMethod()
	{
		$request_method = strtoupper($_SERVER['REQUEST_METHOD']);
		$methods = func_get_args();
		$methods = array_map('strtoupper', $methods);

		if (!in_array($request_method, $methods)) {
			throw new HttpException(405, 'Unsupported request method: ' . $request_method, array("Allow" => implode(", ", $methods)));
		}
	}

	const REQUEST_METHOD_GET = 'GET';
	const REQUEST_METHOD_POST = 'POST';
	const REQUEST_METHOD_DELETE = 'DELETE';
	const REQUEST_METHOD_PUT = 'PUT';

	public static function GetParameters()
	{
		return self::parameters(func_get_args(), $_GET);
	}

	public static function PostParameters()
	{
		return self::parameters(func_get_args(), $_POST);
	}

	private static function parameters($sets, $arr)
	{
		$satisfied = true; # init here in case the foreach has 0 iterations
		foreach ($sets AS $set)
		{
			$satisfied = true; # reset on each iteration

			if (!is_array($set))
				$set = array($set);

			foreach ($set as $param)
			{
				if (empty($arr[$param]))
				{
					$satisfied = false;
					break;
				}
			}
			if ($satisfied)
				break;
		}
		if (!$satisfied)
			throw new HttpException(400);
	}

	public static function ContentType($mime) {
		if (!isset($_SERVER['CONTENT_TYPE']) || $_SERVER['CONTENT_TYPE'] != $mime) {
			throw new HttpException(415);
		}
	}

	public static function ContentLengthSpecified() {
		if (!isset($_SERVER['CONTENT_LENGTH'])) {
			throw new HttpException(411);
		}
	}

	public static function HTTPS() {
		if (empty($_SERVER['HTTPS']) && $_SERVER['SERVER_ADDR'] != '127.0.0.1') {
			throw new HttpException(403, 'Must use HTTPS for authenticated API!');
		}
	}

	public static function credentials($realm = '') {
		if (empty($_SERVER['PHP_AUTH_USER']) || empty($_SERVER['PHP_AUTH_PW'])) {
			throw new HttpException(401, NULL, array('WWW-Authenticate' => 'Basic realm="' . $realm . '"'));
		}
	}

	public static function dbMinRows($db, $msg = NULL, $code = 404, $count = 1) {
		if ((is_a($db, 'mysqli_result') ? $db->num_rows : $db->affected_rows) < $count) {
			throw new HttpException($code, $msg);
		}
	}
}
?>