Simple PHP REST mailer.

rest_mailer.php

<?php 
/**
 * Simple PHP form handler.
 *
 * LICENSE: 
 *
 * The MIT License (MIT)
 * 
 * Copyright (c) 2013 Nicholas Cloward
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @author     Nicholas Cloward <ncloward@gmail.com>
 * @copyright  2013 Nicholas Cloward
 * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
 * @version    1.0
 *
 */

// Fill these out...
$site_name = "";
$to = "";
$from = "";

// Check honey pot field.
if(!empty($_POST["honey"]))
{
	// If its not empty the request is invalid.  Probably a bot.
	header("HTTP/1.1 403 Forbidden");
	echo "Unauthorized access. You do not have sufficient rights to do this action.";
	exit();
}

// Setup form fields based on form type.
$fields = array();
$form_type = ucfirst(strtolower($_POST["type"]));

// Add form types and fields here.
switch ($form_type)
{
	case "Contact":
		$fields = array("Name", "Phone", "Email", "Message");
		break;
	case "Quote":
		$fields = array("Name", "Phone", "Zip", "Email");
		break;
	default:
		header("HTTP/1.1 400 Bad Request");
		echo "Invalid form type.";
		exit();
}

// Setup Variables
$errors = array();
$email = "";
$subject = "$site_name Website -- $form_type form submission";
$body = "You have received a new message from the $site_name website $form_type form. Here are the details:" . PHP_EOL . PHP_EOL;

// Validate fields
foreach ($fields as &$field) 
{
	// Get value of field.
	$value = stripslashes(strip_tags($_POST[strtolower($field)]));

	// Check if its empty.
    if(empty($value))
    {
		array_push($errors, array(strtolower($field), $field . "$field is required."));
    }

    // Check if its an email field.
    if(strtolower($field) == "email")
    {
    	// Validate email address
		if(!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i", $value))
	    {
	    	array_push($errors, array(strtolower($field), "$field is invalid."));
	    }
	    else
	    {
	    	$email = $value;
	    }
    }

    // Append form data to email body.
    $body .= "$field: $value" . PHP_EOL;
}

// Check if there were any errors.
if(!empty($errors))
{
	// Return bad request with json of error fields.
	header("HTTP/1.1 400 Bad Request");
	echo json_encode(array("fields" => $errors));
	exit();
}

// Setup Email headers.
$headers = "From: $from" . PHP_EOL;
$headers .= "Reply-To: $email" . PHP_EOL;
$headers .= "X-Mailer: PHP/" . phpversion();
	
// Send email and check if it was successful.
if(!mail($to,$subject,$body,$headers))
{
	// Sending email faild return 500.
	header("HTTP/1.1 500 Internal Server Error");
	echo json_encode(array("error" => "An error occurred while sending the email."));
	exit();
}

// Email was successful return success.
echo json_encode(array("success" => true));

?>