Generate a pre signed S3 URL using the Javascript AWS SDK

Question

I am trying to allow access to assets from a presigned URL but I am unsure of how to do this. From this page I can see I need the following:

Authorization = "AWS" + " " + AWSAccessKeyId + ":" + Signature;

Signature = Base64( HMAC-SHA1( YourSecretAccessKeyID, UTF-8-Encoding-Of( StringToSign ) ) );

StringToSign = HTTP-Verb + "\n" +
  Content-MD5 + "\n" +
  Content-Type + "\n" +
  Date + "\n" +
  CanonicalizedAmzHeaders +
  CanonicalizedResource;

CanonicalizedResource = [ "/" + Bucket ] +
  <HTTP-Request-URI, from the protocol name up to the query string> +
  [ subresource, if present. For example "?acl", "?location", "?logging", or "?torrent"];

CanonicalizedAmzHeaders = <described below>

I know how to find the AWSAccessKeyId and the YourSecretAccessKeyID but how do I encode it using HMAC-SHA1 to form the final signature?

This pseudocode is unrelated to generating signed URLs with the Javascript SDK. Is that what you want to do? — Michael - sqlbot
– Michael - sqlbot, Commented Jun 14, 2017 at 2:02
It seems you can generate it like so: s3.getSignedUrl('getObject', params, function (err, url) { console.log("The URL is", url); }); but that is to download the file, I just need to be able to display it in a browser — Jeremy Thomas
– Jeremy Thomas, Commented Jun 14, 2017 at 12:47
That will also work for displaying the file, if you uploaded it to S3 with the correct content type. Check that in the metadata of the object, in the S3 console. — Michael - sqlbot
– Michael - sqlbot, Commented Jun 14, 2017 at 12:52
What would I be looking for? Mine says "content/type application/octet-stream" and thats it — Jeremy Thomas
– Jeremy Thomas, Commented Jun 14, 2017 at 13:19

Jeremy Thomas · Accepted Answer · 2017-06-14 15:19:12Z

5

I was able to generate a presigned URL for fetching files like according to this Amazon S3 node example page:

declare var AWS:any;

AWS.config.accessKeyId = "key_goes_here";
AWS.config.secretAccessKey = "secret_key_goes_here";
AWS.config.region = "region_goes_here";

params = {
    Bucket: 'bucket_name_goes_here',
    Key:  'path_to_file_goes_here'
}

s3.getSignedUrl('getObject', params, function (err, url) { 
    // Do some sort of processing with url
});

answered Jun 14, 2017 at 15:19

Jeremy Thomas

6,81411 gold badges57 silver badges106 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Generate a pre signed S3 URL using the Javascript AWS SDK

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related