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/method.ts | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 lib/server/filter/method.ts

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

diff --git a/lib/server/filter/method.ts b/lib/server/filter/method.ts
new file mode 100644
index 0000000..7d6aa76
--- /dev/null
+++ b/lib/server/filter/method.ts
@@ -0,0 +1,30 @@
+import {
+    Either,
+    HttpMethod,
+    IEither,
+    type ITraceable,
+    LogLevel,
+    PenguenoError,
+    type PenguenoRequest,
+    type RequestFilter,
+    type ServerTrace,
+    TraceUtil,
+} from '@emprespresso/pengueno';
+
+export const requireMethod =
+    (methods: Array<HttpMethod>): RequestFilter<HttpMethod> =>
+    (req: ITraceable<PenguenoRequest, ServerTrace>) =>
+        req
+            .flatMap(TraceUtil.withFunctionTrace(requireMethod))
+            .map((t): IEither<PenguenoError, HttpMethod> => {
+                const {
+                    req: { method },
+                } = t.get();
+                if (!methods.includes(method)) {
+                    const msg = "that's not how you pet me (⋟﹏⋞)~";
+                    t.trace.traceScope(LogLevel.WARN).trace(msg);
+                    return Either.left(new PenguenoError(msg, 405));
+                }
+                return Either.right(method);
+            })
+            .get();
-- 
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