Validation for prices and objection

src/common/interceptors/unicode-digits-normalize.interceptor.ts

@@ -0,0 +1,31 @@
+import {
+  CallHandler,
+  ExecutionContext,
+  Injectable,
+  NestInterceptor,
+} from "@nestjs/common";
+import { Observable } from "rxjs";
+import { normalizeUnicodeDigitsDeep } from "src/utils/unicode-digits";
+
+/**
+ * Normalizes Unicode decimal digits in JSON request bodies to ASCII before
+ * validation and handlers run (Persian/Arabic-Indic → 0-9).
+ */
+@Injectable()
+export class UnicodeDigitsNormalizeInterceptor implements NestInterceptor {
+  intercept(context: ExecutionContext, next: CallHandler): Observable<unknown> {
+    const req = context.switchToHttp().getRequest();
+    const contentType = String(req.headers?.["content-type"] ?? "");
+
+    if (
+      req.body &&
+      typeof req.body === "object" &&
+      !Buffer.isBuffer(req.body) &&
+      !contentType.includes("multipart/form-data")
+    ) {
+      req.body = normalizeUnicodeDigitsDeep(req.body);
+    }
+
+    return next.handle();
+  }
+}