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August 9, 2016 18:21
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Google spreadsheet function for signing S3 URLs (very handy for CSV cost allocation reports when combined with the ImportData() function)
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| function sign_s3(access_key, private_key, bucket, object_name, validity, base_url) { | |
| if(!base_url) { | |
| base_url = "http://s3.amazonaws.com"; | |
| } | |
| if(!validity) { | |
| validity = 60; | |
| } | |
| expires = Math.floor((new Date()).getTime() / 1000) + validity; | |
| object_name = encodeURIComponent(object_name); | |
| stringToSign = "GET\n\n\n"+expires+"\n/"+bucket+"/"+object_name; | |
| signature = encodeURIComponent(Utilities.base64Encode(Utilities.computeHmacSignature(Utilities.MacAlgorithm.HMAC_SHA_1, stringToSign, private_key))); | |
| url = base_url+"/"+bucket+"/"+object_name+"?AWSAccessKeyId="+access_key+"&Expires="+expires+"&Signature="+signature; | |
| return url; | |
| } |
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