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如何使用Boto3在Cloudformation中获取API网关的预签名URL?

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我想调用在Cloudformation中维护的API网关 . 我有Cloudformation堆栈名称( CF_STACK_NAME ),API网关资源名称( API_GATEWAY_NAME )和我需要假设的IAM角色的Cloudformation名称( API_ROLE_NAME ) .

我可以通过以下方式访问我的Cloudformation堆栈

cf_client = boto3.client('cloudformation')
api_role_resource = cf_client.describe_stack_resource(
       StackName=CF_STACK_NAME,
       LogicalResourceId=API_ROLE_NAME
)
api_resource = cf_client.describe_stack_resource(
       StackName=CF_STACK_NAME,
       LogicalResourceId=API_GATEWAY_NAME
)

从阅读Switching to an IAM Role,我看到如何获取我的角色,

sts_client = boto3.client('sts')
credentials = sts_client.assume_role(
    RoleArn='arn:aws:iam::{account_id}:role/{role_name}'.format(
        account_id=sts_client.get_caller_identity().get('Account'),
        role_name=api_role_resource['PhysicalResourceId']
    ),
    RoleSessionName="AssumeRoleSession1"
)['Credentials']

但是当我想调用API网址时,

apigateway_client     = boto3.client('apigateway')
restapi_id = apigateway_client.get_rest_api(restApiId=api_logical_id)['id']
url = f'https://{restapi_id}.execute-api.{region}.amazonaws.com/{stage}/{api_query}

api_output = requests.get(url).json()

我明白了

An error occurred (AccessDeniedException) when calling the GetRestApi operation: User: arn:aws:iam::0123456789:user/my-user is not authorized to perform: apigateway:GET on resource: arn:aws:apigateway:us-west-2::/restapis/ServerlessRestApi

如何使用此CloudFormation信息进行API调用?

1 回答

  • 1

    我的猜测是你没有使用STS的新证书 .

    您需要使用以下代码使用新凭据创建apigateway客户端:

    client = boto3.client(
           'apigateway',
            aws_access_key_id=credentials['Credentials']['AccessKeyId'],
            aws_secret_access_key=credentials['Credentials']['SecretAccessKey'],
            aws_session_token=credentials['Credentials']['SessionToken'])
    

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