MatrixConnection.php

@@ -1,12 +1,10 @@
 <?php
+require_once("functions.php");
 class MatrixConnection
 {
 	private $hs;
 	private $at;
 
-	function __construct($homeserver) {
-		$this->hs = $homeserver;
-	}
 	function __construct($homeserver, $access_token) {
 		$this->hs = $homeserver;
 		$this->at = $access_token;
@@ -24,7 +22,7 @@ class MatrixConnection
 		} elseif(is_array($message)) {
 			$send_message = $message;
 		} elseif ($message instanceof MatrixMessage) {
-			$sendmessage = $message->get_object();
+			$send_message = $message->get_object();
 		} else {
 			error_log("message is of not valid type\n");
 			return false;
@@ -36,7 +34,7 @@ class MatrixConnection
 		curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
 		curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 5);
 		curl_setopt($handle, CURLOPT_TIMEOUT, 60);
-		curl_setopt($handle, CURLOPT_POSTFIELDS, json_encode($message));
+		curl_setopt($handle, CURLOPT_POSTFIELDS, json_encode($send_message));
 		curl_setopt($handle, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
 
 		return exec_curl_request($handle);
@@ -50,9 +48,26 @@ class MatrixConnection
 				);
 	}
 
+	function hasUser($username) {
+		if (!$username) {
+			throw new Exception ("no user given to lookup");
+		}
+
+		$url = "https://".$this->hs."/_matrix/client/r0/profile/%40" . $username . "%3A" . $this->hs;
+		$handle = curl_init($url);
+		curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
+		curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 5);
+		curl_setopt($handle, CURLOPT_TIMEOUT, 60);
+		curl_setopt($handle, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
+		curl_setopt($handle, CURLOPT_POSTFIELDS, json_encode($data));
+
+		$res = exec_curl_request($handle);
+		return ($res ? true: false);
+	}
+
 	function register($username, $password, $shared_secret) {
 		if (!$username) {
-			error_log("no username provided")
+			error_log("no username provided");
 		}
 		if (!$password) {
 			error_log("no message to send");
@@ -64,8 +79,8 @@ class MatrixConnection
 			"username" => $user,
 			"password" => $password,
 			"mac" => $mac,
-		}
-		$url="https://".$this->hs."/_matrix/client/v2_alpha/register";
+		);
+		$url = "https://".$this->hs."/_matrix/client/v2_alpha/register";
 		$handle = curl_init($url);
 		curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
 		curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 5);
@@ -88,7 +103,7 @@ class MatrixMessage
 	}
 
 	function set_type($msgtype) {
-		$this->$message["msgtype"] = $msgtype;
+		$this->message["msgtype"] = $msgtype;
 	}
 
 	function set_format($format) {

config.sample.php

@@ -1,6 +1,9 @@
 <?php
 $homeserver = "example.com";
 $access_token = "To be used for sending the registration notification";
-$register_room = '"$registerRoomID:example.com';
+$register_room = '$registerRoomID:example.com';
 $registration_shared_secret = "To be used for actually register the user";
+
+$webroot="https://myregisterdomain.net/";
+$howToURL = "https://my-url-for-storing-howTos.net";
 ?>

database.php

@@ -1,28 +1,55 @@
 <?php  
 $db_file = dirname(__DIR__)."/db_file.sqlite";
 
+abstract class RegisterState
+{
+	// Sending an E-Mail failed in the first attempt. Will retry later
+	const PendingEmailSend = 0;
+	// User got a mail. We wait for it to verfiy
+	const PendingEmailVerify = 1;
+	// Sending a message to the register room failed on first attempt
+	const PendingAdminSend = 5;
+	// No admin has verified the registration yet
+	const PendingAdminVerify = 6;
+	// Registration failed on first attempt. Will retry
+	const PendingRegistration = 7;
+
+	// in this case we have to reset the password of the user (or should we store it for this case?)
+	const PendingSendRegistrationMail = 8;
+
+	// State to allow persisting in the database although an admin declined it.
+	// Will be removed regularly
+	const RegistrationAccepted = 12;
+	const RegistrationDeclined = 13;
+
+	// User got successfully registered. Will be cleaned up later
+	const AllDone = 100;
+}
+
 // create database file when not existent yet
 if (!file_exists($db_file)) {
- $db = new PDO('sqlite:' . $db_file);
- $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
- $db->exec("CREATE TABLE registrations(
-  id INTEGER PRIMARY KEY AUTOINCREMENT, 
-  first_name TEXT,
-  last_name TEXT,
-  username TEXT,
-  note TEXT,
-  email TEXT,
-  verify_token TEXT,
-  request_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP)"); 
+	$db = new PDO('sqlite:' . $db_file);
+	$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+	$db->exec("CREATE TABLE registrations(
+		id INTEGER PRIMARY KEY AUTOINCREMENT,
+		state INT DEFAULT 0,
+		first_name TEXT,
+		last_name TEXT,
+		username TEXT,
+		note TEXT,
+		email TEXT,
+		verify_token TEXT,
+		admin_token TEXT,
+		request_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP)");
 }
 else {
- // establish connection 
- $db = new PDO('sqlite:' . $db_file);
- $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+	// establish connection
+	$db = new PDO('sqlite:' . $db_file);
+	$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
 } 
 
 // set writeable when not set already
 if (!is_writable($db_file)) {
- chmod($db_file, 0777); 
+	chmod($db_file, 0777);
 }
 ?>

functions.php

@@ -47,6 +47,5 @@ function exec_curl_request($handle)
 	}
 
 	return $response;
-
 }
 ?>

lang/lang.de.php

@@ -3,12 +3,22 @@ $language = array(
     "NO_CONFIGURATION" => "Es konnte keine Konfiguration gefunden werden.",
     "UNKNOWN_SESSION" => "Sitzungstoken nicht vorhanden oder ungültig.",
     "UNKNOWN_USERNAME" => "Nutzername fehlt",
+    "UNKNOWN_TOKEN" => "Token ist unbekannt",
     "USERNAME_LENGTH_INVALID" => "Entweder mehr als 20 oder weniger als 3 Zeichen für den Nutzernamen verwendet",
     "USERNAME_NOT_ALNUM" => "Nutzername ist nicht alphanumerisch",
+    "USERNAME_PENDING_REGISTRATION" => "Dieser Nutzername wurde bereits zur Registrierung vorgemerkt. Versuche es später noch einmal oder wähle einen anderen Nutzernamen",
+    "USERNAME_REGISTERED" => "Dieser Nutzername wurde bereits registriert. Bitte wähle einen anderen Nutzernamen",
     "PASSWORD_NOT_MATCH" => "Passwörter stimmen nicht überein",
     "NOTE_LENGTH_EXEEDED" => "Notiz ist länger als die erlaubten 50 Zeichen",
     "EMAIL_INVALID_FORMAT" => "Keine valide E-Mail-Adresse angegeben",
     "FIRSTNAME_INVALID_FORMAT" => "Vorname hat ungültiges Format",
     "SIRNAME_INVALID_FORMAT" => "Nachname hat ungültiges Format",
+    "SEND_MAIL_FAIL" => "Senden der E-Mail fehlgeschlagen",
+    "SEND_MATRIX_FAIL" => "Senden einer Nachricht an die Administratoren fehlgeschlagen",
+    "REGISTRATION_REQUEST_FAILED" => "Registrierungsanfrage ist fehlgeschlagen",
+    "VERIFICATION_SUCCEEDED" => "Verifizierung erfolgreich",
+    "VERIFICATION_FAILED" => "Verifizierung fehlgeschlagen",
+    "VERIFICATION_SUCCESS_BODY" => "Vielen Dank. Die Administratoren wurden informiert",
+    "ADMIN_VERIFY_SITE_TITLE" => "Registrierungsanfrage bearbeiten",
 );
 ?>

public/register.php

@@ -7,6 +7,7 @@ if (!file_exists("../config.php")) {
 	exit();
 }
 require_once "../config.php";
+require_once "../mail_templates.php";
 
 // enforce admin via https
 if (!isset($_SERVER['HTTPS'])) {
@@ -16,67 +17,95 @@ if (!isset($_SERVER['HTTPS'])) {
 
 session_start();
 
+require_once("../database.php");
+
 if ($_SERVER["REQUEST_METHOD"] == "POST") {
-	$success = false;
-	if (!isset($_SESSION["token"]) || !isset($_POST["token"]) || $_SESSION["token"] != $_POST["token"]) {
-		// token not present or invalid
-		$message = $language["UNKNOWN_SESSION"];
-	}
-	elseif (!isset($_POST["username"])) {
-		$message = $language["UNKNOWN_USERNAME"];
-	}
-	elseif (strlen($_POST["username"] > 20 || strlen($_POST["username"]) < 3)) {
-		$message = $language["USERNAME_LENGTH_INVALID"];
-	}
-	elseif (ctype_alnum($_POST['username']) != true) {
-		$message = $language["USERNAME_NOT_ALNUM"];
-	}
-	elseif (isset($_POST["note"]) && strlen($_POST["note"]) > 50) {
-		$message = $language["NOTE_LENGTH_EXEEDED"];
-	}
-	elseif (!isset($_POST["email"]) || !filter_var($_POST["email"], FILTER_VALIDATE_EMAIL)) {
-		$message = $language["EMAIL_INVALID_FORMAT"];
-	}
-	elseif (isset($_POST["first_name"]) && ! preg_match("/[A-Z][a-z]+/", $_POST["first_name"])) {
-		$message = $language["FIRSTNAME_INVALID_FORMAT"];
-	}
-	elseif (isset($_POST["last_name"]) && ! preg_match("/[A-Z][a-z]+/", $_POST["last_name"])) {
-		$message = $language["SIRNAME_INVALID_FORMAT"];
-	}
-	else {
+	try {
+		if (!isset($_SESSION["token"]) || !isset($_POST["token"]) || $_SESSION["token"] != $_POST["token"]) {
+			// token not present or invalid
+			throw new Exception($language["UNKNOWN_SESSION"]);
+		}
+		if (!isset($_POST["username"])) {
+			throw new Exception($language["UNKNOWN_USERNAME"]);
+		}
+		if (strlen($_POST["username"] > 20 || strlen($_POST["username"]) < 3)) {
+			throw new Exception($language["USERNAME_LENGTH_INVALID"]);
+		}
+		if (ctype_alnum($_POST['username']) != true) {
+			throw new Exception($language["USERNAME_NOT_ALNUM"]);
+		}
+		if (isset($_POST["note"]) && strlen($_POST["note"]) > 50) {
+			throw new Exception($language["NOTE_LENGTH_EXEEDED"]);
+		}
+		if (!isset($_POST["email"]) || !filter_var($_POST["email"], FILTER_VALIDATE_EMAIL)) {
+			throw new Exception($language["EMAIL_INVALID_FORMAT"]);
+		}
+		if (isset($_POST["first_name"]) && ! preg_match("/[A-Z][a-z]+/", $_POST["first_name"])) {
+			throw new Exception($language["FIRSTNAME_INVALID_FORMAT"]);
+		}
+		if (isset($_POST["last_name"]) && ! preg_match("/[A-Z][a-z]+/", $_POST["last_name"])) {
+			throw new Exception($language["SIRNAME_INVALID_FORMAT"]);
+		}
+
 		// check valid password
-		require_once("../database.php");
-		$ins_stmt = $db->prepare("INSERT INTO registrations
-			(first_name, last_name, note, email, username, verify_token)
-			VALUES (:first, :last, :note, :email, :username, :token )");
-		$ins_stmt->bindParam(':first', $first);
-		$ins_stmt->bindParam(':last', $last);
-		$ins_stmt->bindParam(':note', $note);
-		$ins_stmt->bindParam(':email', $email);
-		$ins_stmt->bindParam(':username', $user);
-		$ins_stmt->bindParam(':token ', $vToken);
+		$first_name = filter_var($_POST["first_name"], FILTER_SANITIZE_STRING);
+		$last_name = filter_var($_POST["last_name"], FILTER_SANITIZE_STRING);
+		$username = filter_var($_POST["username"], FILTER_SANITIZE_STRING);
+		$note   = filter_var($_POST["note"], FILTER_SANITIZE_STRING);
+		$email  = filter_var($_POST["email"], FILTER_VALIDATE_EMAIL);
+		$verify_token = bin2hex(random_bytes(16));
+		$admin_token = bin2hex(random_bytes(16));
 
-		$first = filter_var($_POST["first_name"], FILTER_SANITIZE_STRING);
-		$last  = filter_var($_POST["last_name"], FILTER_SANITIZE_STRING);
-		$user  = filter_var($_POST["username"], FILTER_SANITIZE_STRING);
-		$note  = filter_var($_POST["note"], FILTER_SANITIZE_STRING);
-		$email = filter_var($_POST["email"], FILTER_VALIDATE_EMAIL);
-		$vToken= bin2hex(random_bytes(16));
+		#	$first="test"; $last="test2"; $user="test3"; $note="empty"; $email="mail+test1@matthias-kesler.de";
+
+		$sql = "SELECT COUNT(*) FROM registrations WHERE username = '" . $username . "' LIMIT 1;";
+		$res = $db->query($sql);
+		if ($res->fetchColumn() > 0) {
+			throw new Exception($language["USERNAME_PENDING_REGISTRATION"]);
+		}
+		require_once("MatrixConnection.php");
+		$mxConn = new MatrixConnection($homeserver, $access_token);
+		if ($mxConn->hasUser($username)) {
+			throw new Exception($language["USERNAME_REGISTERED"]);
+		}
+
+		$db->exec('INSERT INTO registrations
+			(first_name, last_name, username, note, email, verify_token, admin_token)
+			VALUES ("' . $first_name.'","' . $last_name . '","' . $username . '","'	. $note . '","'
+			. $email.'","'	.$verify_token.'","'	.$admin_token.'")');
+		#		$ins_stmt->bindValue(':first_name', $first);
+		#		$ins_stmt->bindValue(':last_lame', $last);
+		#		$ins_stmt->bindValue(':username', $user);
+		#		$ins_stmt->bindValue(':note', $note);
+		#		$ins_stmt->bindValue(':email', $email);
+		#		$ins_stmt->bindValue(':verify_token', $vToken);
+		#		$ins_stmt->bindValue(':admin_token', $adminToken);
+		#		$ins_stmt->bindValue(':now', date('Y-m-d H:i:s'));
+		#
+		#		$ins_stmt->execute();
+
+		$verify_url = $webroot . "/verify.php?t=" . $verify_token;
+		$success = send_mail_pending_verification(
+			$homeserver,
+			$first_name . " " . $last_name,
+			$email,
+			$verify_url);
+
+		$db->exec("UPDATE registrations SET state = " .
+			($success ? RegisterState::PendingEmailVerify : RegisterState::PendingEmailSend)
+			. " WHERE verify_token = \"" . $verify_token. "\";");
 
-		$ins_stmt->execute();
-		$success = true;
-	}
-	if ($success) {
 		print("<title>Erfolgreich</title>");
 		print("</head><body>");
 		print("<h1>Erfolgreich</h1>");
 		print("<p>Bitte überprüfe deine E-Mails um deine E-Mail-Adresse zu bestätigen.</p>");
 		print("<a href=\"" . "/register.php" . "\">Zur Registrierungsseite</a>");
-	} else {
-		print("<title>".$message."</title>");
+	} catch (Exception $e) {
+		print("<title>" . $language["REGISTRATION_REQUEST_FAILED"] . "</title>");
 		print("</head><body>");
-		print("<h1>" . $message . "</h1>");
-		print("<a href=\"" . "/register.php" . "\">Zur Registrierungsseite</a>");
+		print("<h1>" . $language["REGISTRATION_REQUEST_FAILED"] . "</h1>");
+		print("<p>" . $e->getMessage() . "</p>");
+		print("<a href=\"" . $webroot . "/register.php" . "\">Zur Registrierungsseite</a>");
 	}
 } else {
 	$_SESSION["token"] = bin2hex(random_bytes(16));
@@ -139,18 +168,18 @@ body{
   required>
 								</div>
 <?php /**
-								<div class="row">
-									<div class="col-xs-6 col-sm-6 col-md-6">
-										<div class="form-group">
-											<input type="password" name="password" id="password" class="form-control input-sm" placeholder="Passwort" required>
-										</div>
-									</div>
-									<div class="col-xs-6 col-sm-6 col-md-6">
-										<div class="form-group">
-											<input type="password" name="password_confirm" id="password_confirm" class="form-control input-sm" placeholder="Passwort bestätigen" required>
-										</div>
-									</div>
-								</div>
+<div class="row">
+<div class="col-xs-6 col-sm-6 col-md-6">
+<div class="form-group">
+<input type="password" name="password" id="password" class="form-control input-sm" placeholder="Passwort" required>
+</div>
+</div>
+<div class="col-xs-6 col-sm-6 col-md-6">
+<div class="form-group">
+<input type="password" name="password_confirm" id="password_confirm" class="form-control input-sm" placeholder="Passwort bestätigen" required>
+</div>
+</div>
+</div>
  */ ?>
 								<input type="hidden" name="token" id="token" value="<?php echo $_SESSION["token"]; ?>">
 								<input type="submit" value="Registrieren" class="btn btn-info btn-block">
@@ -167,29 +196,29 @@ body{
 				</div>
 			</div>
 		</div>
-		<script type="text/javascript">
-			var first_name = document.getElementById("first_name");
-			first_name.oninvalid = function(event) {
-				event.target.setCustomValidity("Vorname muss das Format <Großbuchstabe><Kleinbuchstaben> haben");
-			}
-			first_name.onkeyup = function(event) {
-				event.target.setCustomValidity("");
-			}
-			var last_name = document.getElementById("last_name");
-			last_name.oninvalid = function(event) {
-				event.target.setCustomValidity("Nachname muss das Format <Großbuchstabe><Kleinbuchstaben> haben");
-			}
-			last_name.onkeyup = function(event) {
-				event.target.setCustomValidity("");
-			}
-			var user_name = document.getElementById("username");
-			user_name.oninvalid = function(event) {
-				event.target.setCustomValidity("Nutzername darf zwischen 3 und 20 kleine Buchstaben und Zahlen enthalten");
-			}
-			user_name.onkeyup = function (event) {
-				event.target.setCustomValidity("");
-			}
-		</script>
+ <script type="text/javascript">
+ var first_name = document.getElementById("first_name");
+	first_name.oninvalid = function(event) {
+		event.target.setCustomValidity("Vorname muss das Format <Großbuchstabe><Kleinbuchstaben> haben");
+	}
+	first_name.onkeyup = function(event) {
+		event.target.setCustomValidity("");
+	}
+	var last_name = document.getElementById("last_name");
+	last_name.oninvalid = function(event) {
+		event.target.setCustomValidity("Nachname muss das Format <Großbuchstabe><Kleinbuchstaben> haben");
+	}
+	last_name.onkeyup = function(event) {
+		event.target.setCustomValidity("");
+	}
+	var user_name = document.getElementById("username");
+	user_name.oninvalid = function(event) {
+		event.target.setCustomValidity("Nutzername darf zwischen 3 und 20 kleine Buchstaben und Zahlen enthalten");
+	}
+	user_name.onkeyup = function (event) {
+		event.target.setCustomValidity("");
+	}
+	</script>
+		<?php } ?>
 	</body>
 </html>
-		<?php } ?>

public/verify.php

@@ -0,0 +1,86 @@
+<html>
+	<head>
+<?php
+require_once "../language.php";
+if (!file_exists("../config.php")) {
+	print($language["NO_CONFIGURATION"]);
+	exit();
+}
+require_once "../config.php";
+require_once "../mail_templates.php";
+
+// enforce admin via https
+if (!isset($_SERVER['HTTPS'])) {
+	header('Location: https://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'], true, 301);
+	exit();
+}
+
+session_start();
+
+try {
+	if ($_SERVER["REQUEST_METHOD"] != "GET") {
+		throw new Exception("Method not allowed");
+	}
+	if (!isset($_GET["t"])) {
+		throw new Exception($language["UNKNOWN_TOKEN"]);
+	}
+	$token = filter_var($_GET["t"], FILTER_SANITIZE_STRING);
+
+	require_once("../database.php");
+
+	$sql = "SELECT COUNT(*) FROM registrations WHERE verify_token = '" . $token . "' LIMIT 1;";
+	$res = $db->query($sql);
+
+	$first_name = NULL; $last_name = NULL; $note = NULL; $email = NULL; $admin_token = NULL;
+
+	if ($res->fetchColumn() > 0) {
+		$sql = "SELECT first_name, last_name, note, email, admin_token FROM registrations WHERE verify_token = '" . $token . "' LIMIT 1;";
+		foreach ($db->query($sql) as $row) {
+			// will only be executed once
+			$first_name = $row["first_name"];
+			$last_name = $row["last_name"];
+			$note = $row["note"];
+			$email = $row["email"];
+			$admin_token = $row["admin_token"];
+		}
+	} else {
+		throw new Exception($language["UNKNOWN_TOKEN"]);
+	}
+
+	require_once("../MatrixConnection.php");
+	$adminUrl = $webroot . "/admin_verify.php?t=" . $admin_token;
+	$mxConn = new MatrixConnection($homeserver, $access_token);
+	$mxMsg = new MatrixMessage();
+	$mxMsg->set_body($first_name . ' ' . $last_name . "möchte sich registrieren und hat folgende Notiz hinterlassen:\r\n"
+		. $note . "\r\n"
+		. "Zum Bearbeiten hier klicken:\r\n" . $adminUrl);
+	$mxMsg->set_formatted_body($first_name . ' ' . $last_name . " möchte sich registrieren und hat folgende Notiz hinterlassen:<br />"
+		. $note . "<br />"
+		. "Zum Bearbeiten <a href=\"". $adminUrl . "\">hier</a> klicken");
+	$mxMsg->set_type("m.text");
+	$response = $mxConn->send($register_room, $mxMsg);
+
+	if ($response) {
+		$message = $language["SEND_MATRIX_FAIL"];
+	}
+	$db->exec("UPDATE registrations SET state = " .
+		($response ? RegisterState::PendingAdminVerify : RegisterState::PendingAdminSend)
+		. " WHERE verify_token = \"" . $verify_token. "\";");
+
+	send_mail_pending_approval($homeserver, $first_name . " " . $last_name, $email);
+
+	print("<title>" . $language["VERIFICATION_SUCEEDED"] . "</title>");
+	print("</head><body>");
+	print("<h1>" . $language["VERIFICATION_SUCEEDED"] . "</h1>");
+	print("<p>" . $language["VERIFICATION_SUCCESS_BODY"] . "</p>");
+	print("<a href=\"" . $webroot . "/register.php" . "\">Zur Registrierungsseite</a>");
+} catch (Exception $e) {
+	print("<title>" . $language["VERIFICATION_FAILED"] . "</title>");
+	print("</head><body>");
+	print("<h1>" . $language["VERIFICATION_FAILED"] . "</h1>");
+	print("<p>" . $e->getMessage() . "</p>");
+	print("<a href=\"" . $webroot . "/register.php" . "\">Zur Registrierungsseite</a>");
+}
+?>
+	</body>
+</html>

public/verify_admin.php

@@ -0,0 +1,164 @@
+<html>
+	<head>
+<?php
+require_once "../language.php";
+if (!file_exists("../config.php")) {
+	print($language["NO_CONFIGURATION"]);
+	exit();
+}
+require_once "../config.php";
+require_once "../mail_templates.php";
+
+// enforce admin via https
+if (!isset($_SERVER['HTTPS'])) {
+	header('Location: https://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'], true, 301);
+	exit();
+}
+
+session_start();
+
+try {
+	if ($_SERVER["REQUEST_METHOD"] == "GET") {
+		throw new Exception("Method not allowed");
+	}
+	if (!isset($_GET["t"])) {
+		throw new Exception($language["UNKNOWN_TOKEN"]);
+	}
+	$token = filter_var($_GET["t"], FILTER_SANITIZE_STRING);
+
+	$action = NULL;
+	if (isset($_GET("allow")) {
+		$action = RegisterState::RegistrationAccepted;
+	}
+	if (isset($_GET("deny")) {
+		$action = RegisterState::RegistrationDeclined;
+	}
+
+	require_once("../database.php");
+
+	$sql = "SELECT COUNT(*) FROM registrations WHERE admin_token = '" . $token . "' LIMIT 1;";
+	$res = $db->query($sql);
+
+	$first_name = NULL; $last_name = NULL; $username = NULL; $note = NULL; $email = NULL;
+
+	if ($res->fetchColumn() > 0) {
+		$sql = "SELECT first_name, last_name, username, note, email FROM registrations WHERE admin_token = '" . $token . "' LIMIT 1;";
+		foreach ($db->query($sql) as $row) {
+			// will only be executed once
+			$first_name = $row["first_name"];
+			$last_name = $row["last_name"];
+			$username = $row["username"];
+			$note = $row["note"];
+			$email = $row["email"];
+		}
+	} else {
+		throw new Exception($language["UNKNOWN_TOKEN"]);
+	}
+
+	if ($action == RegisterState::RegistrationAccepted) {
+		$db->exec("UPDATE registrations SET state = " . RegisterState::RegistrationAccepted)
+			. " WHERE admin_token = \"" . $token. "\";");
+
+		// register user
+		require_once("MatrixConnection.php");
+		$mxConn = new MatrixConnection($homeserver, $access_token);
+
+		// generate a password with 8 characters
+		$password = bin2hex(openssl_random_pseudo_bytes(4));
+
+		$res = $mxConn->register($username, $password, $shared_secret);
+
+		// send registration_success
+		send_mail_registration_success($homeserver, $first_name . " " . $last_name, $email, $username, $password, $howToURL)
+	} elseif ($action == RegisterState::RegistrationDeclined) {
+		$db->exec("UPDATE registrations SET state = " . RegisterState::RegistrationAccepted)
+			. " WHERE admin_token = \"" . $token. "\";");
+	}
+
+	$adminUrl = $webroot . "/admin_verify.php?t=" . $admin_token;
+	print("<title>" . $language["ADMIN_VERIFY_SITE_TITLE"] . "</title>");
+?>
+		<link href="//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet">
+		<style>
+body{
+	background-color: #525252;
+}
+.centered-form{
+	margin-top: 60px;
+}
+
+.centered-form .panel{
+	background: rgba(255, 255, 255, 0.8);
+	box-shadow: rgba(0, 0, 0, 0.3) 20px 20px 20px;
+}
+		</style>
+		<script type="text/javascript" src="//code.jquery.com/jquery-1.11.1.min.js"></script>
+		<script type="text/javascript" src="//netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script>
+	</head>
+	<body>
+		<div class="container">
+			<div class="row centered-form">
+				<div class="col-xs-12 col-sm-8 col-md-4 col-sm-offset-2 col-md-offset-4">
+					<div class="panel panel-default">
+						<div class="panel-heading">
+							<h3 class="panel-title"><?php echo $language["ADMIN_VERIFY_SITE_TITLE"] ; ?></h3>
+						</div>
+						<div class="panel-body">
+							<form name="appForm" role="form" action="verify_admin.php" method="GET">
+								<div class="row">
+									<div class="col-xs-6 col-sm-6 col-md-6">
+										<div class="form-group">
+											<input type="text" id="first_name" class="form-control input-sm"
+											value="<?php echo $first_name; ?>" disabled=true>
+										</div>
+									</div>
+									<div class="col-xs-6 col-sm-6 col-md-6">
+										<div class="form-group">
+											<input type="text" id="last_name" class="form-control input-sm"
+											value="<?php echo $last_name; ?>" disabled=true>
+										</div>
+									</div>
+								</div>
+
+								<div class="form-group">
+								<input type="text" id="note" class="form-control input-sm" value="<?php echo $note; ?>" disabled=true>
+								</div>
+
+								<div class="form-group">
+									<input type="text" id="username" class="form-control input-sm"
+									value="<?php echo $username; ?>" disabled=true>
+								</div>
+								<input type="hidden" name="t" id="token" value="<?php echo $token; ?>">
+								<input type="submit" name="allow" value="Bestätigen" class="btn btn-info btn-block">
+								<input type="submit" name="deny" value="Ablehnen" class="btn btn-info btn-block">
+
+							</form>
+						</div>
+					</div>
+				</div>
+			</div>
+		</div>
+ <script type="text/javascript">
+
+	if ($response) {
+		$message = $language["SEND_MATRIX_FAIL"];
+	}
+	$db->exec("UPDATE registrations SET state = " .
+		($response ? RegisterState::PendingAdminVerify : RegisterState::PendingAdminSend)
+		. " WHERE verify_token = \"" . $verify_token. "\";");
+
+	print("<title>" . $language["VERIFICATION_SUCEEDED"] . "</title>");
+	print("</head><body>");
+	print("<h1>" . $language["VERIFICATION_SUCEEDED"] . "</h1>");
+	print("<p>" . $language["VERIFICATION_SUCCESS_BODY"] . "</p>");
+	print("<a href=\"" . $webroot . "/register.php" . "\">Zur Registrierungsseite</a>");
+} catch (Exception $e) {
+	print("<title>" . $language["VERIFICATION_FAILED"] . "</title>");
+	print("</head><body>");
+	print("<h1>" . $language["VERIFICATION_FAILED"] . "</h1>");
+	print("<p>" . $e->getMessage() . "</p>");
+	print("<a href=\"" . $webroot . "/register.php" . "\">Zur Registrierungsseite</a>");
+}
+?>
+	</body>
+</html>