2 files changed, 95 insertions, 4 deletions
diff --git a/src/application/mystic/forum/utils/RequestUtils.php b/src/application/mystic/forum/utils/RequestUtils.php
index 2f40013..f6ce3a3 100644
--- a/src/application/mystic/forum/utils/RequestUtils.php
+++ b/src/application/mystic/forum/utils/RequestUtils.php
@@ -3,17 +3,86 @@ declare(strict_types=1);
 
 namespace mystic\forum\utils;
 
+use mystic\forum\Database;
 use mystic\forum\Messaging;
+use mystic\forum\orm\User;
 
 final class RequestUtils {
     use StaticClass;
 
+    public static function getRequestMethod(): string {
+        return strtoupper($_SERVER["REQUEST_METHOD"] ?? "GET");
+    }
+
+    public static function isRequestMethod(string $method): bool {
+        $rMethod = self::getRequestMethod();
+        return strcasecmp($rMethod, $method) === 0;
+    }
+
     public static function ensureRequestMethod(string $method): void {
-        $rMethod = $_SERVER["REQUEST_METHOD"];
-        if (strcasecmp($rMethod, $method) !== 0) {
-            http_response_code(500);
-            Messaging::error("Invalid request method $rMethod");
+        if (!self::isRequestMethod($method)) {
+            http_response_code(415);
+            Messaging::error("Invalid request method " . self::getRequestMethod());
+            exit;
+        }
+    }
+
+    public static function getRequiredField(string $field): string {
+        $fieldValue = $_POST[$field] ?? null;
+        if ($fieldValue === null) {
+            http_response_code(400);
+            Messaging::error("Missing required field $field");
             exit;
         }
+        return $fieldValue;
+    }
+
+    public static function storeForm(): void {
+        $_SESSION["lastForm"] = $_POST ?? [];
+        $_SESSION["lastForm_uri"] = $_SERVER["REQUEST_URI"];
+    }
+
+    public static function triggerFormError(string $message, ?string $next = null): never {
+        $next ??= $_SERVER["REQUEST_URI"];
+        $_SESSION["formError"] = $message;
+        // store last form submission
+        self::storeForm();
+        header("Location: $next");
+        exit;
+    }
+
+    public static function getAndClearFormError(): ?string {
+        $err = $_SESSION["formError"] ?? null;
+        unset($_SESSION["formError"]);
+        return $err;
+    }
+
+    public static function getLastForm(string &$lastFormUri): ?array {
+        $lastFormUri = $_SESSION["lastForm_uri"] ?? "";
+        return $_SESSION["lastForm"] ?? null;
+    }
+
+    public static function clearLastForm(): void {
+        unset($_SESSION["lastForm"]);
+        unset($_SESSION["lastForm_uri"]);
+    }
+
+    public static function getAuthorizedUser(Database &$db): ?User {
+        $userId = $_SESSION["authedUser"] ?? null;
+        if ($userId === null)
+            return null;
+        $user = new User();
+        $user->id = $userId;
+        if (!$db->fetch($user))
+            return null;
+        return $user;
+    }
+
+    public static function setAuthorizedUser(User &$user): void {
+        $_SESSION["authedUser"] = $user->id;
+    }
+
+    public static function unsetAuthorizedUser(): void {
+        unset($_SESSION["authedUser"]);
     }
 }
diff --git a/src/application/mystic/forum/utils/ValidationUtils.php b/src/application/mystic/forum/utils/ValidationUtils.php
new file mode 100644
index 0000000..df97914
--- /dev/null
+++ b/src/application/mystic/forum/utils/ValidationUtils.php
@@ -0,0 +1,22 @@
+<?php
+declare(strict_types=1);
+
+namespace mystic\forum\utils;
+
+use mystic\forum\Database;
+use mystic\forum\orm\User;
+
+final class ValidationUtils {
+    use StaticClass;
+
+    public static function isUsernameValid(string $name): bool {
+        return !!preg_match('/^[a-z0-9]([._](?![._])|[a-z0-9]){2,30}[a-z0-9]$/', $name);
+    }
+
+    public static function isUsernameAvailable(Database &$db, string $name): bool {
+        $user = new User();
+        $user->name = $name;
+        return !$db->fetchWhere($user, "name");
+    }
+}
+