How do I upload a file into a protected s3 bucket from Swift using the s3 bucket created by AWS mobile hub?

Question

I have an AWS mobile hub project and am attempting to upload a file into the protected folder of the autogenerated bucket.

S3 Bucket

private
protected
public
uploads

I am using the AWSS3TransferUtility to upload files currently after my user has authenticated. I looked at the docs and the website left inside the folders upon creation. They have setup the permissions to protect the data in different ways in different folders. I was able to upload files to the uploads folder with no problem. I then tried to upload to the private and protected folder and received an authorized 403 from the API call. I checked into the permissions on the bucket through IAM.

Example from IAM

BucketName | string like | appname-userfiles-mobilehub-1213213213, ObjectPath | string like | private/${cognito-identity.amazonaws.com:sub}/*

So I have deduced the key for upload must include the cognito-identity in the key. How do I get the current user's cognito-identity such that it will match and allow me to upload my files to S3 while ensuring their data protection integrity?

This might be a repeat of stackoverflow.com/questions/42605419/… — Victor 'Chris' Cabral
– Victor 'Chris' Cabral, Commented Jun 2, 2018 at 22:26

Victor 'Chris' Cabral · Accepted Answer · 2018-06-02 22:37:48Z

1

I had the AWSIdentifyManager to pull the user id.

// start of upload code
let transferUtility = AWSS3TransferUtility.default()
let user = AWSIdentityManager.default().identityId
let newKey = "protected/"+user!+"/"+fileURL.lastPathComponent

 transferUtility.uploadData(
     data,
     bucket: "appbucket-name",
     key: newKey,
      contentType: "text/plain",
 ...
 //rest of code from the docs

answered Jun 2, 2018 at 22:37

Victor 'Chris' Cabral

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