CODEWITHSUNDEEP
javascriptamazon-web-servicesamazon-s3
Jeremy Thomas
Jeremy Thomas

Reputation: 6674

Generate a pre signed S3 URL using the Javascript AWS SDK

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?

Upvotes: 2

Views: 2420

Answers (1)

Jeremy Thomas
Jeremy Thomas

Reputation: 6674

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
});

Upvotes: 5

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