Misc fixes, fixes normal registrations

api/username.php

@@ -0,0 +1,54 @@
+<?php
+set_include_path("../includes/");
+require_once("../inside/credentials.php");
+require_once("../includes/DB.php");
+
+/* Functions */
+
+/* Set HTTP response code */
+function set_response_code($code) {
+    if(!is_int($code)) {
+        return false;
+    }
+    header('X-Ignore-This: something', true, $code);
+}
+
+header('Access-Control-Allow-Origin: *', true); // Come fetch!
+
+/* Connect to database */
+$options = array(
+    'debug'       => 2,
+    'portability' => DB_PORTABILITY_ALL,
+);
+
+$conn = DB::connect(getDSN(), $options);
+
+if(DB :: isError($conn)) {
+    echo $conn->toString();
+}
+$conn->setFetchMode(DB_FETCHMODE_ORDERED);
+
+/* Validate params */
+if(!isset($_GET['q'])) {
+    set_response_code(400);
+    echo json_encode(array('error' => "Missing param q"));
+    die();
+}
+
+$query = $_GET['q'];
+$query = $conn->quoteSmart($query);
+
+// Search query
+$sql = "SELECT id FROM din_user WHERE username=$query";
+$res = $conn->query($sql);
+
+if( DB::isError($res) ) {
+    set_response_code(500);
+    echo json_encode(array('error' => $res->message));
+    die();
+}
+$userExists = $res->numRows() > 0;
+
+echo json_encode(array('result' => $userExists));
+
+?>