chore: initial project scaffold: backend/src/common/normalize-dates.interceptor.ts

backend/src/common/normalize-dates.interceptor.ts

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+import {
+  CallHandler,
+  ExecutionContext,
+  Injectable,
+  NestInterceptor,
+} from '@nestjs/common';
+import { Observable } from 'rxjs';
+
+const DATE_ONLY = /^\d{4}-\d{2}-\d{2}$/;
+const DATETIME_NO_TZ = /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}(:\d{2}(\.\d+)?)?$/;
+
+const normalize = (value: unknown): unknown => {
+  if (value === null || value === undefined) return value;
+  if (typeof value === 'string') {
+    if (DATE_ONLY.test(value)) return `${value}T00:00:00.000Z`;
+    if (DATETIME_NO_TZ.test(value)) return `${value}Z`;
+    return value;
+  }
+  if (Array.isArray(value)) return value.map(normalize);
+  if (typeof value === 'object') {
+    const out: Record<string, unknown> = {};
+    for (const [k, v] of Object.entries(value as Record<string, unknown>)) {
+      out[k] = normalize(v);
+    }
+    return out;
+  }
+  return value;
+};
+
+@Injectable()
+export class NormalizeDatesInterceptor implements NestInterceptor {
+  intercept(ctx: ExecutionContext, next: CallHandler): Observable<unknown> {
+    const req = ctx.switchToHttp().getRequest<{ body?: unknown }>();
+    if (req.body && typeof req.body === 'object') {
+      req.body = normalize(req.body);
+    }
+    return next.handle();
+  }
+}