Add single user security mode (#3)

- Tweaks to SQL column definitions
- Implement class autoloading
- Split user config into its own file

src/lib/Security.php

@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * Security functions
+ */
+class Security {
+
+    /** @var int Run as a single user requiring no password */
+    public const int SINGLE_USER = 0;
+
+    /** @var int Run as a single user requiring a password */
+    public const int SINGLE_USER_WITH_PASSWORD = 1;
+
+    /** @var int Require users to provide e-mail address and password */
+    public const int MULTI_USER = 2;
+
+    /**
+     * Verify that user is logged on
+     * @param bool $redirectIfAnonymous Whether to redirect the request if there is no user logged on
+     */
+    public static function verifyUser(bool $redirectIfAnonymous = true): void {
+        switch (SECURITY_MODEL) {
+            case self::SINGLE_USER:
+                $user = self::retrieveSingleUser();
+                break;
+            case self::SINGLE_USER_WITH_PASSWORD:
+                die('Single User w/ Password has not yet been implemented');
+            case self::MULTI_USER:
+                die('Multi-User Mode has not yet been implemented');
+            default:
+                die('Unrecognized security model (' . SECURITY_MODEL . ')');
+        }
+        if (!$user && $redirectIfAnonymous) {
+            header('/logon?returnTo=' . $_SERVER["REQUEST_URI"], true, HTTP_REDIRECT_TEMP);
+            die();
+        }
+        $_REQUEST['FRC_USER_ID']    = $user['id'];
+        $_REQUEST['FRC_USER_EMAIL'] = $user['email'];
+    }
+
+    /**
+     * Retrieve the single user
+     * @return array The user information for the single user
+     */
+    private static function retrieveSingleUser(): array {
+        $user = Data::findUserByEmail('solouser@example.com');
+        if ($user) return $user;
+        Data::addUser('solouser@example.com', 'no-password-required');
+        return Data::findUserByEmail('solouser@example.com');
+    }
+}