我是一名新手，对于nodejs和aws不太熟悉。请问有人能指出以下代码在调整s3存储桶中的图像大小方面出了什么问题吗？
代码如下：
'use strict';
const AWS = require('aws-sdk');
const S3 = new AWS.S3({
accessKeyId: "xxxxxxxxxxxx",
secretAccessKey: "yyyyyyyyyyy",
region: "us-east-1",
signatureVersion: 'v4',
});
const Sharp = require('sharp');
const BUCKET = "patientimg";
const URL = "https://s3.ap-south-1.amazonaws.com";
exports.handler = function(event, context, callback) {
const key = event.queryStringParameters.key;
const match = key.match(/(\d+)x(\d+)\/(.*)/);
const width = parseInt(match[1], 10);
const height = parseInt(match[2], 10);
const originalKey = match[3];
S3.getObject({Bucket: BUCKET, Key: originalKey}).promise()
.then(data => Sharp(data.Body)
.resize(width, height)
.toFormat('png')
.toBuffer()
)
.then(buffer => S3.putObject({
Body: buffer,
Bucket: BUCKET,
ContentType: "image/png",
Key: key,
}).promise()
)
.then(() => callback(null, {
statusCode: '301',
headers: {'location': "${URL}/${key}"},
body: "",
})
)
.catch(err => callback(err))
}
这是我正在使用的确切代码，使用"S3 put"请求进行测试时Lambda的输出
{
"errorMessage": "RequestId: edaddaf7-4c5e-11e7-bed8-13f72aaa5d38 Process exited before completing request"
}
感谢您的提前帮助。