I'm trying to create a signature to use as access for an API call but can't figure out the syntax for the PythonCaller (if that is indeed the right transformer to be using). I need to use an input (a concatenated string comprised of Date, Accesskey, HTTP method, path) and a secret key to "calculate the HmacSHA1 value for the signature, and Base64 encode it". This tool helps but I'm trying to replicate this process in FME: https://hash.online-convert.com/sha1-generator
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