install zod for input validation

api/src/errors/http-error.ts

@@ -24,8 +24,12 @@ export class MissingParameter extends HTTPException{
 }
 
 export class InvalidParameter extends HTTPException{
-    constructor(paramName: string){
-        super(400, { message: `Provided parameter '${paramName}' is invalid.` })
+    constructor(paramName?: string){
+        super(400, { message:
+            paramName
+            ? `Provided parameter '${paramName}' is invalid.`
+            : 'Provided invalid parameter.'
+        })
     }
 }
 

api/src/lib/http-z-validator.ts

@@ -0,0 +1,15 @@
+import * as z from 'zod'
+import { zValidator } from '@hono/zod-validator'
+import { InvalidParameter } from '../errors'
+
+/**
+ * Custom Zod Validator Middleware with support for HTTP Exceptions
+ * @param type Part of HonoRequest object to get data from
+ * @param schema Zod Validation scheme (docs: https://zod.dev/api)
+ * @returns zValidator for running the validation
+ */
+export default function httpZValidator<T extends z.ZodTypeAny>(type: 'query' | 'json' | 'param' = 'query', schema: T){
+    return zValidator(type, schema, (result, c) => {
+        if(!result.success) throw new InvalidParameter();
+    })
+}