将带有NodeJS的AWS Lambda图像上载到s3会导致文件损坏

我有一个用NodeJS编写的无服务器(AWS)应用程序,带有公开的GraphQL端点,并将图像上传到S3 bucket。

GraphQL lambda的定义如下

graphql:
  handler: src/functions/graphql/graphql.handler
  name: ${self:provider.stackName}-graphql
  events:
    - http:
        method: POST
        path: /graphql

GraphQL lambda基本上就是这样

const server = new ApolloServer({
  typeDefs,
  resolvers,
});

export const handler = server.createHandler();

我有一个 upload 突变定义

type Mutation {
    uploadPhoto(file: Upload!, location: String): String!
}

分解器是这样的

public async uploadPhoto(
    parent: any,
    params: { file: any; location: string }
  ): Promise<string> {
    const file = await params.file;

    const { createReadStream, filename, mimetype } = file;
    const { ext } = parse(filename);
    const uploadParams: S3.Types.PutObjectRequest = {
      Bucket: process.env.PHOTO_BUCKET,
      Key: `${params.location}/${randomNumber}${ext}`,
      ContentType: mimetype,
      Body: createReadStream(),
      ContentEncoding: "base64",
      ACL: "public-read",
    };
    try {
      console.log("upload params", uploadParams);
      const sendData = await this.s3bucket.upload(uploadParams).promise();
      console.log(sendData);
      return sendData.Location;
    } catch (error) {
      console.log("error uploading file", error);
      return error.message;
    }
  }

还可以让API网关接受我安装的二进制数据

custom:
  apigwBinary:
    types: 
      - image/jpeg
      - image/jpg
      - image/png

plugins:
  - serverless-apigw-binary

尽管如此,在这一切之后,我可以上传 .txt 例如文件,但图像看起来像这样 https://cutt.ly/cg7zA6O 就像一个空文件。内容类型正常,文件大小也正常,但图像已损坏。

我猜API网关可能有问题,但我不是100%确定