/**
 * Copyright (c) Microsoft Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import bytes from 'bytes';
import type { IncomingMessage } from 'node:http';

export default function getRawBody(req: IncomingMessage, { limit, encoding }: { limit: string, encoding: BufferEncoding }) {
  const limitNumber = bytes.parse(limit) as number;
  return new Promise<string>((resolve, reject) => {
    let received = 0;

    const chunks: Buffer[] = [];
    req.on('data', (chunk: Buffer) => {
      received += chunk.length;
      if (received > limitNumber)
        return reject(new Error(`Message size exceeds limit of ${limit} bytes`));
      chunks.push(chunk);
    });
    req.on('end', () => {
      try {
        resolve(Buffer.concat(chunks).toString(encoding));
      } catch (error) {
        reject(error);
      }
    });
    req.on('error', error => {
      reject(error);
    });
  });
}