File corrupted after upload to S3 using Lambda and API Gateway

Question

Hi people,   
  
I am trying upload the file using Lambda to S3 way API GateWay, i am using the code below, the file is sent to S3 such as show the images 'test_using_postman.png' and 's3_file.png', however when I try open, the show message the file corrupted such as show the 'open_file_with_problem.png'. The images are below.  
  
Somone know the happened ?  
  
Thank you!  
  
_Images:_  
Test Using Postman: https://drive.google.com/open?id=1eenEnvuMQU28iI_Ltqzpw9OlCvIcY5Fg  
S3 File: https://drive.google.com/open?id=1b1_CmIhzfc8mQj_rwCK6Xy30gzoP6HcK  
Open File with problem: https://drive.google.com/open?id=1o54rLB9wWF1KxdUOkq3xAGVET7UWoqgf  
  
_Code NodeJS:_

```
 
const crypto = require('crypto');

var AWS = require('aws-sdk');

AWS.config.update({region: 'us-east-1'});

module.exports.arquivo_upload =  (event, context, callback) => {
  
  let BUCKET_NAME = 'XXXXX';

  let fileContent = event.body;
  let filePath = 'upload/';
  let fileName = crypto.createHash('md5').update('niby_'+Date.now()).digest("hex");

  s3 = new AWS.S3({apiVersion: '2006-03-01'});

  var uploadParams = {
      Bucket: BUCKET_NAME, 
      Key: filePath+fileName+'.png', 
      Body: fileContent,
      ContentType: "image/png"
    };

  s3.upload(uploadParams, function (err, data) {
    if (err) {

      console.error(err);

      callback(null,{
        statusCode:400,
        body: JSON.stringify(err),
      });

    } if (data) {

      console.info(data.Location);

      callback(null,{
        statusCode:200,
        body: JSON.stringify(data.Location),
      });
    }
  });
}
```

Edited by: LeandroBR on Apr 8, 2020 3:49 PM

LeandroBR · Answer

I resolved this problem! I sending file using base64 to API Gateway and lambda functions setup parameter "ContentEncoding: 'base64'".

```
...
buf = new Buffer(obj.content,'base64')

  let fileName = crypto.createHash('md5').update(config.application_name+'_'+Date.now()).digest("hex");

  s3 = new AWS.S3({apiVersion: config.s3.version});

  var uploadParams = {
      Bucket: config.s3.bucket_name, 
      Key: config.s3.file_path+fileName+obj.extension, 
      Body: buf,
      ContentEncoding: 'base64',
      *ContentType: obj.content_type,*
      ACL: "public-read"
    };

  s3.upload(uploadParams, function (err, data)
...
```

Edited by: LeandroBR on Apr 12, 2020 11:47 AM

File corrupted after upload to S3 using Lambda and API Gateway

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