Slide 23 - Sending Email § Session 13

Sending Email

Mail service -- e.g. Mailgun, Sendgrid, etc.

submit.php Example (uses Mailgun)

<?php require_once 'vendor/autoload.php';

     $loader = new \Twig\Loader\FilesystemLoader('./templates');
     $twig = new \Twig\Environment($loader, [
         'cache' => './compilation_cache',
         'debug' => true,
         'auto_reload' => true
     ]);
     $requestTime = new DateTime();
     $requestTime->setTimestamp($_SERVER['REQUEST_TIME']);
     $requestTimeHuman = $requestTime->format('Y-m-d\TH:i:s');

     $echocontent = $twig->render('form-response-template.html',
          [
          'getparams' => $_GET,
          'postparams' => $_POST,
          'httpheaders' => getallheaders(),
          'httpmethod' => $_SERVER['REQUEST_METHOD'],
          'serverinfo' => $_SERVER,
          'requesttime' => $requestTimeHuman,
          'httpreferer' => $_SERVER['HTTP_REFERER']
          ]);
     ?>


     <?php

     require 'vendor/autoload.php';
     use Mailgun\Mailgun;

     $mailto = filter_var($_POST['__mailto'], FILTER_VALIDATE_EMAIL);
     $mailkey = '';
     if (preg_match('/^csci(e|s)12\-(spring|summer|fall)-\d{4}-[a-z]+[0-9]+$/',$_POST['__mailkey'])) {
        $mailkey = $_POST['__mailkey'];
     }

     // only send if POST and if __mailto and if __mailkey exist

     if (strcmp($_SERVER['REQUEST_METHOD'],'POST') == 0 && $mailto && $mailkey ) {
       error_log("FormSubmit | MAILGUN | $mailkey | $mailto |");
       // First, instantiate the SDK with your API credentials
       $MG_API_KEY = getenv('MG_API_KEY');
       $MG_DOMAIN = getenv('MG_DOMAIN');
       $MG_ = getenv('MG_');

       $mg = Mailgun::create($MG_API_KEY); // For US servers
       $domain = $MG_DOMAIN;

       // Now, compose and send your message.
       // $mg->messages()->send($domain, $params);
       $mg->messages()->send($domain, [
         ''    => $MG_,
         'to'      => $mailto,
         'subject' => 'Form Submission',
         'html'    => $echocontent
       ]);
     }

     echo($echocontent);
     ?>

form_response_template.html

This is a PHP "Twig" template.

<DOCTYPE html>
     <html lang="en">
       <head>
        <title>Form Submission</title>
        <style><!-- inline styles removed for clarity --></style>
       </head>

       <body>
         <h1>Form Submission</h1>
         {% if getparams %}
         <h2>GET Parameters</h2>
         <table>
           <thead>
             <tr><th>Name</th><th>Value</th></tr>
           </thead>
           <tbody>
           {% for key, value in getparams %}
           <tr>
             <th>{{ key }}</th>
             <td>
               {% if value is iterable %}
               {% for v in value %}
                 {{ v }}{% if not(loop.last) %},<br/>{% endif %}
               {% endfor %}
               {% else %}
                 {{ value }}
               {% endif %}
             </td>
           </tr>
           {% endfor %}
           </tbody>
         </table>
         {% endif %}

         {% if postparams %}
         <h2>POST Parameters</h2>
         <table>
           <thead>
             <tr><th>Name</th><th>Value</th></tr>
           </thead>
           <tbody>
           {% for key, value in postparams %}
           <tr>
             <th>{{ key }}</th>
             <td>
               {% if value is iterable %}
               {% for v in value %}
                 {{ v }}{% if not(loop.last) %},<br/>{% endif %}
               {% endfor %}
               {% else %}
                 {{ value }}
               {% endif %}
             </td>
           </tr>
           {% endfor %}
           </tbody>
         </table>
         {% endif %}

         {% if serverinfo %}
         <h2>Request Information</h2>
         <table>
           <thead>
             <tr><th>Name</th><th>Value</th></tr>
           </thead>
           <tbody>
             <tr><th>Request Time</th><td>{{ requesttime }}</td></tr>
             <tr><th>Remote Address</th><td>{{ serverinfo['REMOTE_ADDR'] }}</td></tr>
             <tr><th>HTTP Referrer</th><td><a href="{{ httpreferer }}">{{ httpreferer }}</a></td></tr>
             <tr><th>HTTP Method</th><td>{{ httpmethod }}</td></tr>
           </tbody>
         </table>
         {% endif %}

         <footer>
           <p>This form submission tool is only for use by current students in <a href="https://cscie12.dce.harvard.edu/">CSCI E-12</a> and <a href="https://cscis12.dce.harvard.edu/">CSCI S-12</a> courses.</p><p>David Heitmeyer | <a href="https://extension.harvard.edu/">Harvard Extension School</a> | <a href="https://summer.harvard.edu/">Harvard Summer School</a></footer>
       </body>
      </html>