AWS Lambda：“参数验证失败”

Question

AWS Lambda：“参数验证失败”

Pro*_*ova 1 python amazon-web-services boto3 aws-lambda

我有一个 lambda 函数，我在其中发送电子邮件，并且邮件模板作为对象从 S3 存储桶中获取。我已经在我的计算机本地运行了代码并且工作正常。当我将其粘贴到 lambda 函数中时，它显示以下错误。

Response:
{
  "errorMessage": "Parameter validation failed:\nInvalid type for parameter Message.Body.Html.Data, value: b\"<html>\\n<head></head>\\n<body>\\n  <h1>Amazon SES Test (SDK for Python)</h1>\\n  <p>This email was sent with\\n    <a href='https://aws.amazon.com/ses/'>Amazon SES</a> using the\\n    <a href='https://aws.amazon.com/sdk-for-python/'>\\n      AWS SDK for Python (Boto)</a>.</p>\\n</body>\\n</html>\", type: <class 'bytes'>, valid types: <class 'str'>",
  "errorType": "ParamValidationError",
  "stackTrace": [
    [
      "/var/task/lambda_function.py",
      65,
      "lambda_handler",
      "Source=SENDER,"
    ],
    [
      "/var/runtime/botocore/client.py",
      314,
      "_api_call",
      "return self._make_api_call(operation_name, kwargs)"
    ],
    [
      "/var/runtime/botocore/client.py",
      586,
      "_make_api_call",
      "api_params, operation_model, context=request_context)"
    ],
    [
      "/var/runtime/botocore/client.py",
      621,
      "_convert_to_request_dict",
      "api_params, operation_model)"
    ],
    [
      "/var/runtime/botocore/validate.py",
      291,
      "serialize_to_request",
      "raise ParamValidationError(report=report.generate_report())"
    ]
  ]
}

Request ID:
"7b13a612-97f6-4278-9825-724abeaa3b51"

Function Logs:
START RequestId: 7b13a612-97f6-4278-9825-724abeaa3b51 Version: $LATEST
Parameter validation failed:
Invalid type for parameter Message.Body.Html.Data, value: b"<html>\n<head></head>\n<body>\n  <h1>Amazon SES Test (SDK for Python)</h1>\n  <p>This email was sent with\n    <a href='https://aws.amazon.com/ses/'>Amazon SES</a> using the\n    <a href='https://aws.amazon.com/sdk-for-python/'>\n      AWS SDK for Python (Boto)</a>.</p>\n</body>\n</html>", type: <class 'bytes'>, valid types: <class 'str'>: ParamValidationError
Traceback (most recent call last):
  File "/var/task/lambda_function.py", line 65, in lambda_handler
    Source=SENDER,
  File "/var/runtime/botocore/client.py", line 314, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/var/runtime/botocore/client.py", line 586, in _make_api_call
    api_params, operation_model, context=request_context)
  File "/var/runtime/botocore/client.py", line 621, in _convert_to_request_dict
    api_params, operation_model)
  File "/var/runtime/botocore/validate.py", line 291, in serialize_to_request
    raise ParamValidationError(report=report.generate_report())
botocore.exceptions.ParamValidationError: Parameter validation failed:
Invalid type for parameter Message.Body.Html.Data, value: b"<html>\n<head></head>\n<body>\n  <h1>Amazon SES Test (SDK for Python)</h1>\n  <p>This email was sent with\n    <a href='https://aws.amazon.com/ses/'>Amazon SES</a> using the\n    <a href='https://aws.amazon.com/sdk-for-python/'>\n      AWS SDK for Python (Boto)</a>.</p>\n</body>\n</html>", type: <class 'bytes'>, valid types: <class 'str'>

END RequestId: 7b13a612-97f6-4278-9825-724abeaa3b51
REPORT RequestId: 7b13a612-97f6-4278-9825-724abeaa3b51  Duration: 1608.47 ms    Billed Duration: 1700 ms    Memory Size: 128 MB Max Memory Used: 71 MB

Run Code Online (Sandbox Code Playgroud)

我检查过，当我从 S3 存储桶加载模板时，它在 lambda 中显示以下错误。当我在代码中声明 BODY_HTML 并且不从 Lambda 中的 S3 获取它时，它工作正常。现在这是我的代码：

import json
import os
import boto3
from botocore.exceptions import ClientError

SENDER = "***********"
RECIPIENT = "************"
AWS_REGION = "us-east-1"
def lambda_handler(event, context):            
    CHARSET = "UTF-8"
    client = boto3.client('ses',aws_access_key_id=******,
                              aws_secret_access_key=*****,region_name='us-east-1')
    s3_client = boto3.client('s3',aws_access_key_id=*********,
                                  aws_secret_access_key=***********,region_name='us-east-1')
    s3_response_object = s3_client.get_object(Bucket='my s3 bucket', Key='template.html')
    object_content = s3_response_object['Body'].read()
    BODY_HTML = object_content
    SUBJECT = "sqs-poc-lambda test email"
    BODY_TEXT = ("This is a test email for sqs-poc-lambda"
                )

    try:
        #Provide the contents of the email.
        response = client.send_email(
            Destination={
                'ToAddresses': [
                    RECIPIENT,
                ],
            },
            Message={
                'Body': {
                    'Html': {
                        'Charset': CHARSET,
                        'Data': BODY_HTML,
                    },
                    'Text': {
                        'Charset': CHARSET,
                        'Data': BODY_TEXT,
                    },
                },
                'Subject': {
                    'Charset': CHARSET,
                    'Data': SUBJECT,
                },
            },
            Source=SENDER,
        )

    except ClientError as e:
        print(e.response['Error']['Message'])
    else:
        print("Email sent! Message ID:"),
        print(response['MessageId'])

Run Code Online (Sandbox Code Playgroud)

）

它应该在Function Logs. 对此有什么帮助吗？我看不出这背后有任何逻辑。

Answer 1

Mat*_*ava 5

很难相信第二个代码可以工作，因为它包含第一个错误日志中报告的相同错误。我已经复制了代码，但它以同样的方式失败。

通过从错误日志中读取此消息可以发现问题。

参数 Message.Body.Html.Data 的类型无效，值：b"..."，类型：类字节，有效类型：类“str”：ParamValidationError。

主体应该是字符串类型，但是object_content

object_content = s3_response['Body'].read()

Run Code Online (Sandbox Code Playgroud)

是字节类型。您需要将其转换为字符串。例如BODY_HTML = str(object_content)

重要的

不要在 lambda 代码中存储永久凭据。

client = boto3.client('ses',aws_access_key_id=******,
                          aws_secret_access_key=*****,region_name='us-east-1')
s3_client = boto3.client('s3',aws_access_key_id=*********,
                          aws_secret_access_key=***********,region_name='us-east-1')

Run Code Online (Sandbox Code Playgroud)

通过 Lambda 执行角色向您的 lambda 函数授予权限。

如果您需要提供对 lambda 函数的跨帐户访问，请sts:AssumeRole在该角色中包含权限，然后使用通过调用获得的临时凭据sts:AssumeRole

client = boto3.client(
    'ses',
    aws_access_key_id=...,
    aws_secret_access_key=...,
    aws_session_token=... // !!!
)

Run Code Online (Sandbox Code Playgroud)

但同样，永远不要在函数代码中存储永久凭据。您确定下次将代码放入某个公共存储库时不会忘记将这些值替换为吗******？每一次？

归档时间：	6 年，3 月前
查看次数：	20789 次
最近记录：	6 年，3 月前