Fix display username decryption when using output()

router.php

@@ -90,6 +90,20 @@ function startSession() {
 if (isset($_COOKIE[SESSION_COOKIE_NAME]))
 	startSession(); // Resume session
 
+if (isset($_SESSION['id'])) {
+	if (!isset($_COOKIE['display-username-decryption-key']))
+		output(403, 'The display username decryption key has not been sent.');
+	$decryption_result = htmlspecialchars(sodium_crypto_aead_xchacha20poly1305_ietf_decrypt(
+		$_SESSION['display-username-cyphertext'],
+		NULL,
+		$_SESSION['display-username-nonce'],
+		base64_decode($_COOKIE['display-username-decryption-key'])
+	));
+	if ($decryption_result === false)
+		output(403, 'Unable to decrypt display username.');
+	define('DISPLAY_USERNAME', $decryption_result);
+}
+
 if (in_array(SERVICE, ['reg', 'ns', 'ht']) AND CONF[SERVICE]['enabled'] !== true)
 	output(403, 'Ce service est désactivé.');
 
@@ -125,20 +139,6 @@ if ($_POST !== []) {
 		require 'pg-act/' . PAGE_ADDRESS . '.php';
 }
 
-if (isset($_SESSION['id'])) {
-	if (!isset($_COOKIE['display-username-decryption-key']))
-		output(403, 'The display username decryption key has not been sent.');
-	$decryption_result = htmlspecialchars(sodium_crypto_aead_xchacha20poly1305_ietf_decrypt(
-		$_SESSION['display-username-cyphertext'],
-		NULL,
-		$_SESSION['display-username-nonce'],
-		base64_decode($_COOKIE['display-username-decryption-key'])
-	));
-	if ($decryption_result === false)
-		output(403, 'Unable to decrypt display username.');
-	define('DISPLAY_USERNAME', $decryption_result);
-}
-
 function displayPage($data) {
 
 	require 'view.php';