Aws file download authorization

I will show you the method to download a single file, multiple files, or an entire bucket. I will first show you the S3 console method and then the CLI method. Unfortunately, you cannot download multiple files or the entire bucket at the same time using the AWS console. You can download one file at a time. You will have to use the CLI method to download multiple files. As you can see in the picture below, when I select multiple files the download button gets disabled. You can try the below steps and see if it works for you.

These steps did not work for me but I have seen these working for others. You can definitely try. Note - If you are wondering, let me tell you that you do not need to specify any region in the below commands. To download the files as per your requirements, you can use the following command -. To download the files one from the images folder in s3 and the other not in any folder from the bucket that I created, the following command can be used -.

And then we include the two files from the excluded files. Let us say we have three files in our bucket, file1, file2, and file3. And then with the help of include, we can include the files which we want to download. Example - --include "file1" will include the file1. To download the entire bucket, use the below command -.

The above command downloads all the files from the bucket you specified in the local folder. As you may have noticed, we have used sync or cp in the above commands. Just for your knowledge, the difference between the sync and cp is that the sync option syncs your bucket with the local folder whereas the cp command copies the objects you specified to the local folder. For our purpose to download files from s3 we can use either one of sync or cp.

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There are two different authentication methods currently in use for AWS S3, the now deprecated Signature Version 2 method and the current Signature Version 4 method. Getting Signature Version 2 working is a little easier, if you want an example of that contact us.

Basically the process involves computing HMAC and hash results from a very specific set of information and then setting the HTTP Authorization header based and a few others on the results.

This process is of course only needed if your buckets are private. Of course you can populate this any way you like. Which ever key and secret you provide should include IAM permissions to perform whatever operations you want to do on your bucket objects.

Before we can actually start computing the values needed to make this work, we also need some cryptographic functionality. Fortunately there is already a great JavaScript library called Forge which provides both of these in an easy to use way.

With a little cajoling it can be made to work in the RealityServer V8 environment. Download the latest release of Forge. Open the archive and extract the contents of the forge-x. It can go in any directory you have configured for V8 includes but should be in its own folder.

Now within your command you can include Forge like this. The window variable needs to be defined for the library to work correctly. The library normally detects whether it is running in Node. Other than that it works perfectly out of the box. What the documentation does not mention at least not in the same place is that each link in the chain expects the bytes from the last, not the hex string.

Forge is now ready to use in your command. You might be surprised how many other off the shelf JavaScript libraries can be run in RealityServer V8 with a few tricks. If you read the Amazon documentation you should recognise all of the elements here.

This code assumes there are variables called bucket and key which define the AWS S3 bucket you want to access and the [Object Key] which uniquely identifies a given object within a bucket not to be confused with the AWS access key.

This is what is needed for a simple GET request. However the most troublesome elements are all covered in the above code. So we want to download a binary scene file from S3.

Since this example is requesting a binary file, we set encoding to null.