Installation

$ nimph clone disruptek/sigv4

$ git clone https://github.com/disruptek/sigv4$ echo '--path="$config/sigv4/"' >> nim.cfg

$ nimble install https://github.com/disruptek/sigv4

Usage

import jsonimport httpcoreimport sigv4let# the URL of the request  url="https://iam.amazonaws.com/?Action=ListUsers&Version=2010-05-08"# an AWS Secret Key  secret="wJalrXUtnFEMI/K7MDENG+bPxRfiCYEXAMPLEKEY"# the body of the request; eg. POST content  payload=""# the AWS region against which you are querying  region="us-east-1"# the short name of the service as you might find in, say, an ARN  service="iam"# an enum representing the signing algorithm, eg. SHA256 or SHA512  digest= SHA256# an ISO8601 date string attached to the request  date= makeDateTime()# a JsonNode holding the query string key/value pairs, as provided by the stdlib  query=%* {"Action":"ListUsers","Version":"2010-05-08",  }# http headers as provided by the stdlib  headers= newHttpHeaders(@[    ("Host","iam.amazonaws.com"),    ("Content-Type","application/x-www-form-urlencoded; charset=utf-8"),    ("X-Amz-Date", date),  ])# compose a credential scope  scope= credentialScope(region=region, service=service, date=date)# compose the canonical request  request= canonicalRequest(HttpGet, url, query, headers, payload, digest=digest)# use the request and scope to compose a string-to-sign  sts= stringToSign(request.hash(digest), scope, date=date, digest=digest)# calculate the signature for the request using a secret key  signature= calculateSignature(secret=secret, date=date, region=region,                                 service=service, tosign=sts, digest=digest)assert signature=="5d672d79c15b13162d9279b0855cfba6789a8edb4c82c400e06b5924a6f2b5d7"

Pre-signed S3 Url

let  host="my-bucket.s3-eu-west-1.amazonaws.com"  url="https://"& host&"/2021/my-image.jpg"  region="eu-west-1"  service="s3"  secretKey="wJalrXUtnFEMI/K7MDENG+bPxRfiCYEXAMPLEKEY"  accessKey="AKIAQ0BPAG50Q8KFTR7F"#token    = ""  payload=""  digest= SHA256  expireSec="60"  datetime="20210330T032054Z"#makeDateTime()  scope= credentialScope(region=region, service=service, date=datetime)  query=%* {"Action":"GetObject","X-Amz-Algorithm":$SHA256,"X-Amz-Credential": accessKey&"/"& scope,"X-Amz-Date": datetime,"X-Amz-Expires": expireSec,# "X-Amz-Security-Token": token,"X-Amz-SignedHeaders":"host"  }  headers= newHttpHeaders(@[    ("Host", host)  ])  request= canonicalRequest(HttpGet, url, query, headers, payload, digest=UnsignedPayload)  sts= stringToSign(request.hash(digest), scope, date=datetime, digest=digest)  signature= calculateSignature(secret=secretKey, date=datetime, region=region,                                service=service, tosign=sts, digest=digest)  finalUrl= url&"?"& request.split("\n")[2]&"&X-Amz-Signature="& signatureassert finalUrl=="https://my-bucket.s3-eu-west-1.amazonaws.com/2021/my-image.jpg?Action=GetObject&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAQ0BPAG50Q8KFTR7F%2F20210330%2Feu-west-1%2Fs3%2Faws4_request&X-Amz-Date=20210330T032054Z&X-Amz-Expires=60&X-Amz-SignedHeaders=host&X-Amz-Signature=e4506eac1665d53c658a3229118067a3f01bc00ee8ab3c8f9708b789ca5c9673"

Documentation

Tests

$ nimble test

License