Allow for logging in via email address

Accept both user names and email addresses in the login prompt.

Suggested-by: Johannes Löthberg <johannes@kyriasis.com>
Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

web/html/login.php

@@ -28,7 +28,7 @@ html_header('AUR ' . __("Login"));
 			<ul class="errorlist"><li><?= $login_error ?></li></ul>
 			<?php endif; ?>
 			<p>
-				<label for="id_username"><?= __('Username') . ':'; ?></label>
+				<label for="id_username"><?= __('User name or email address') . ':'; ?></label>
 				<input id="id_username" type="text" name="user" size="30" maxlength="<?= config_get_int('options', 'username_max_len'); ?>" value="<?php if (isset($_POST['user'])) { print htmlspecialchars($_POST['user'], ENT_QUOTES); } ?>" autofocus="autofocus" />
 			</p>
 			<p>

web/lib/acctfuncs.inc.php

@@ -479,7 +479,7 @@ function try_login() {
 	}
 
 	$dbh = DB::connect();
-	$userID = uid_from_username($_REQUEST['user']);
+	$userID = uid_from_loginname($_REQUEST['user']);
 
 	if (user_suspended($userID)) {
 		$login_error = __('Account suspended');

web/lib/aur.inc.php

@@ -466,6 +466,21 @@ function uid_from_username($username) {
 	return $row[0];
 }
 
+/**
+ * Determine the user's ID in the database using a username or email address
+ *
+ * @param string $username The username or email address of an account
+ *
+ * @return string Return user ID if exists, otherwise null
+ */
+function uid_from_loginname($loginname) {
+	$uid = uid_from_username($loginname);
+	if (!$uid) {
+		$uid = uid_from_email($loginname);
+	}
+	return $uid;
+}
+
 /**
  * Determine the user's ID in the database using an e-mail address
  *