Custom readValidatedBody util to return more specific error #69 (#78)

* feat: add readDropValidatedBody w/ special handler for ArkErrors

* fix: lint

server/arktype.ts

@@ -1,4 +1,6 @@
+import { ArkErrors } from "arktype";
 import { configure } from "arktype/config";
+import type { H3Event } from "h3";
 
 export const throwingArktype = configure({
   onFail: (errors) => errors.throw(),
@@ -12,3 +14,24 @@ declare global {
     onFail: typeof throwingArktype.onFail;
   }
 }
+
+export async function readDropValidatedBody<T>(
+  event: H3Event,
+  validate: (data: object) => T,
+): Promise<T> {
+  const _body = await readBody(event);
+  try {
+    return validate(_body);
+  } catch (e) {
+    if (e instanceof ArkErrors) {
+      throw createError({
+        statusCode: 400,
+        statusMessage: `Invalid request body: ${e.summary}`,
+      });
+    }
+    throw createError({
+      statusCode: 400,
+      statusMessage: `Invalid request body: ${e}`,
+    });
+  }
+}