Use Named Credential to Upload File in S3

We mostly have requirements to upload files in file storage servers like AWS S3 Server, Dropbox, Google Drive, etc. This post will help in uploading files to S3 Server. We will use named credential to upload file in S3 server.

Steps for uploading file in S3 Server using named credential

1. Create a named credential for AWS Credential
2. Create an apex class to upload file
3. Test functionality

1. Create a named credential for AWS Credential

Create a named credential with Authentication Protocol as AWS Signature Version 4.

AWS Signature Version 4 (SigV4) is the process to add authentication information to AWS API requests sent by HTTP.  No need to set any header in this case. All information is shared using this named credential itself.

Named Credential Detail

2 Create an apex class to upload file

Let us create an apex class that will upload files to the AWS S3 server. For this post, I have created one function which will take LinkedEntityId which is a record where the file is attached.

We need blob data of attachment to store in S3 Server. So we have used file content VersionData which is in blob format.

Apart from callout, we need not be required to put any header information for API requests. Named credential will take care of auth headers.

3. Test functionality

Let us test uploading of files. For testing, the below code can be executed in the developer console’s anonymous window to upload a document that is attached to the record id. This recordid can be of case, account, contact or any custom object.

AWSFileService service=new AWSFileService();
service.UploadDocuments('5002v00002qbQxWAAU');

The above code can also be written in one method to make requests dynamic and used by many processes.

@AuraEnabled
public static void UploadDocToS3Server(string recordId)
{
AWSFileService service=new AWSFileService();
service.UploadDocuments(recordId);
}

We can call method UploadDocToS3Server from lightning components.

References:

Signature Version 4 signing process

Checkout previous posts for similar requirements.

Uploading Files to S3 Server using Apex

Download Files From S3 Server using Apex

View S3 File in Lightning Web Component