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?

CodePudding user response：

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