client frontend added

y-trash/management_frontend copy/src/app/api/utils/requestHandlers.ts

@@ -0,0 +1,70 @@
+import { NextRequest } from "next/server";
+import { errorResponse } from "./responseHandlers";
+import { ValidationResult, ApiHandler, ApiHandlerBodyOnly, ApiHandlerWithRequest } from "./types";
+
+/**
+ * Safely parse JSON request body with error handling
+ * @param request NextRequest object
+ * @returns Parsed request body or null if parsing fails
+ */
+export async function parseRequestBody(request: NextRequest) {
+  try {
+    return await request.json();
+  } catch (error) {
+    return null;
+  }
+}
+
+/**
+ * Wrapper for API route handlers with built-in error handling
+ * @param handler The handler function to wrap
+ */
+export function withErrorHandling(
+  handler: ApiHandler
+) {
+  return async (request: NextRequest) => {
+    try {
+      const body = await parseRequestBody(request);
+      
+      if (body === null) {
+        return errorResponse("Invalid request body", 400);
+      }
+      
+      // Check handler parameter count to determine if it needs request object
+      // If handler has only 1 parameter, it's likely a create operation that only needs body
+      if (handler.length === 1) {
+        // Cast to the appropriate handler type
+        return await (handler as ApiHandlerBodyOnly)(body);
+      } else {
+        // Otherwise pass both request and body (for list, update, delete operations)
+        return await (handler as ApiHandlerWithRequest)(request, body);
+      }
+    } catch (error: any) {
+      return errorResponse(
+        error.message || "Internal Server Error", 
+        error.status || 500
+      );
+    }
+  };
+}
+
+/**
+ * Validate that required fields are present in the request body
+ * @param body Request body
+ * @param requiredFields Array of required field names
+ * @returns Object with validation result and error message if validation fails
+ */
+export function validateRequiredFields(body: any, requiredFields: string[]): ValidationResult {
+  const missingFields = requiredFields.filter(field => 
+    body[field] === undefined || body[field] === null || body[field] === ''
+  );
+  
+  if (missingFields.length > 0) {
+    return {
+      valid: false,
+      error: `Missing required fields: ${missingFields.join(', ')}`
+    };
+  }
+  
+  return { valid: true };
+}