From 9970036d203ba2d0a46b35ba6fad21d49441cdd4 Mon Sep 17 00:00:00 2001
From: Elizabeth Hunt <me@liz.coffee>
Date: Sun, 27 Jul 2025 17:03:10 -0700
Subject: hai

---
 lib/server/filter/index.ts | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 lib/server/filter/index.ts

(limited to 'lib/server/filter/index.ts')

diff --git a/lib/server/filter/index.ts b/lib/server/filter/index.ts
new file mode 100644
index 0000000..509deb3
--- /dev/null
+++ b/lib/server/filter/index.ts
@@ -0,0 +1,34 @@
+import {
+    type IEither,
+    type ITraceable,
+    LogLevel,
+    type PenguenoRequest,
+    type ServerTrace,
+} from '@emprespresso/pengueno';
+
+export enum ErrorSource {
+    USER = LogLevel.WARN,
+    SYSTEM = LogLevel.ERROR,
+}
+
+export class PenguenoError extends Error {
+    public readonly source: ErrorSource;
+    constructor(
+        override readonly message: string,
+        public readonly status: number,
+    ) {
+        super(message);
+        this.source = Math.floor(status / 100) === 4 ? ErrorSource.USER : ErrorSource.SYSTEM;
+    }
+}
+
+export interface RequestFilter<
+    T,
+    Err extends PenguenoError = PenguenoError,
+    RIn = ITraceable<PenguenoRequest, ServerTrace>,
+> {
+    (req: RIn): IEither<Err, T> | Promise<IEither<Err, T>>;
+}
+
+export * from './method';
+export * from './json';
-- 
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