개요

실행 내용

import json
import boto3

def lambda_handler(event, context):

    s3 = boto3.resource('s3')
    bucket = s3.Bucket('my-hoge-hoge-bucket')
    bucket.download_file('test.txt', 'fuga.txt')

Lambda에 표시되는 오류

{
  "errorMessage": "An error occurred (AccessDenied) when calling the GetObject operation: Access Denied",
  "errorType": "ClientError",
  "stackTrace": [
    "  File \"/var/task/lambda_function.py\", line 11, in lambda_handler\n    bucket.download_file('test.txt', 'fuga.txt')\n",
    "  File \"/var/runtime/boto3/s3/inject.py\", line 244, in bucket_download_file\n    return self.meta.client.download_file(\n",
    "  File \"/var/runtime/boto3/s3/inject.py\", line 170, in download_file\n    return transfer.download_file(\n",
    "  File \"/var/runtime/boto3/s3/transfer.py\", line 307, in download_file\n    future.result()\n",
    "  File \"/var/runtime/s3transfer/futures.py\", line 106, in result\n    return self._coordinator.result()\n",
    "  File \"/var/runtime/s3transfer/futures.py\", line 265, in result\n    raise self._exception\n",
    "  File \"/var/runtime/s3transfer/tasks.py\", line 126, in __call__\n    return self._execute_main(kwargs)\n",
    "  File \"/var/runtime/s3transfer/tasks.py\", line 150, in _execute_main\n    return_value = self._main(**kwargs)\n",
    "  File \"/var/runtime/s3transfer/download.py\", line 511, in _main\n    response = client.get_object(\n",
    "  File \"/var/runtime/botocore/client.py\", line 357, in _api_call\n    return self._make_api_call(operation_name, kwargs)\n",
    "  File \"/var/runtime/botocore/client.py\", line 676, in _make_api_call\n    raise error_class(parsed_response, operation_name)\n"
  ]
}

원인

해결책