Can I upload form-data files to S3 via AWS API-Gateway?

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In AWS environment I want to upload a file to S3 via API gateway. I can't use lambda, because the 6MB payload limit. (The API gateway's 10MB limit is fine.) I could manage to upload a file with POST request and binary body. My question is how can I upload a picture which is wrapped in a multipart/form-data and can I set a file size and format limitation without using lambda functions?

api-gateway amazon-web-services amazon-s3 file
1 Answers

You should use aws-sdk to create the API end point and get the url:

  • API Code (aws-sdk API Doc):

    • for upload, reference s3.getSignedUrl('putObject')
    • Don't use S3.putObject for upload document, it is a difference concept
    • Example: 
      return new Promise((resolve, reject) => {
  let url = this.S3.getSignedUrl("getObject", {
  Bucket: bucket,
  Key: key,
  Expires: expires_second
})
return resolve(url)

  • S3 Bucket Config (Reference Link):

    • Select your bucket
    • Permissions Tab > Cross-origin resource sharing (CORS) > Edit 
        [
    {
      "AllowedHeaders": [
        "*",
        "Authorization"
      ],
      "AllowedMethods": [
        "POST",
        "GET",
        "PUT",
        "DELETE",
        "HEAD"
      ],
      "AllowedOrigins": [
        "*"
      ],
      "ExposeHeaders": [],
      "MaxAgeSeconds": 3000
    }  
  ]
    • Confirm your AllowedMethods existing PUT method

  • Upload Document(Postman case)

    • Copy and paste the link which get from s3.getSignedUrl('putObject')
    • Body tab > binary > select you document
    • Headers > uncheck 'Content-Type', 'User-Agent'
    • [Optional] if u want to accept selected file type, edit { Accept: '*/*'}
      • Example: {Accept: 'image/png' }
    • Send with PUT method

  • now you may check the s3 bucket

other helpful reference: https://medium.com/@aidan.hallett/securing-aws-s3-uploads-using-presigned-urls-aa821c13ae8d

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