finance/src/pages/api/transactions/index.ts

/**
 * TODO: Security Improvements
 * - Add input validation and sanitization
 * - Implement rate limiting for API endpoints
 * - Add request authentication
 * - Implement CSRF protection
 * - Add request logging and monitoring
 * - Implement secure session management
 * - Add API versioning
 * - Set up proper CORS configuration
 */

import type { APIRoute } from 'astro';
import { accounts, transactions } from '../../../data/store';
import type { Transaction } from '../../../types';

/**
 * TODO: API Improvements
 * - Add request rate limiting
 * - Implement proper API authentication
 * - Add input sanitization
 * - Implement request validation middleware
 * - Add API versioning
 * - Consider implementing GraphQL for more flexible queries
 * - Add proper logging and monitoring
 */

export const POST: APIRoute = async ({ request }) => {
  try {
    const transaction = (await request.json()) as Omit<Transaction, 'id'>;

    // Validate required fields
    if (
      !transaction.accountId ||
      !transaction.date ||
      !transaction.description ||
      transaction.amount === undefined
    ) {
      return new Response(JSON.stringify({ error: 'Missing required fields' }), {
        status: 400,
        headers: { 'Content-Type': 'application/json' },
      });
    }

    // Validate account exists
    const account = accounts.find((a) => a.id === transaction.accountId);
    if (!account) {
      return new Response(JSON.stringify({ error: 'Account not found' }), {
        status: 404,
        headers: { 'Content-Type': 'application/json' },
      });
    }

    // Create new transaction with generated ID
    const newTransaction: Transaction = {
      ...transaction,
      id: (transactions.length + 1).toString(), // Simple ID generation for demo
    };

    // Update account balance
    account.balance += transaction.amount;

    // Add to transactions array
    transactions.push(newTransaction);

    return new Response(JSON.stringify(newTransaction), {
      status: 201,
      headers: { 'Content-Type': 'application/json' },
    });
  } catch (error) {
    return new Response(JSON.stringify({ error: 'Invalid request body' }), {
      status: 400,
      headers: { 'Content-Type': 'application/json' },
    });
  }
};