[erlang-questions] Amazon API -- Lookup by ISBN -- amended

lloyd <>
Wed Apr 8 23:50:53 CEST 2015


Hello again,

OK, I've found erlcloud. Looks like it has what I need. But user documentation is far to skimpy for my feeble brain:

https://github.com/gleber/erlcloud

Can some kind soul help me translate this example...

http://docs.aws.amazon.com/AWSECommerceService/latest/DG/EX_LookupbyISBN.html

...into the appropriate erlcloud request function?

Thanks,

LRP 

-----Original Message-----
From: 
Sent: Wednesday, April 8, 2015 4:47pm
To: "Erlang Questions" <>
Subject: [erlang-questions] Amazon API -- Lookup by ISBN

Hello,

I'm striving to look up books in Amazon's db by ISBN. At first blush it looks easy enough:

http://docs.aws.amazon.com/AWSECommerceService/latest/DG/EX_LookupbyISBN.html

But the last item, Signature, baffles me. Procedure here:

http://docs.aws.amazon.com/AWSECommerceService/latest/DG/rest-signature.html

I'm fine with this until I hit step 4: 

-- Sort parameter/value pairs by byte value --- I can see how to do this manually, but don't know how put Erlang to the task

And I'm really stumped when I hit step 8:

-- Calculate an RFC 2104-compliant HMAC with the SHA256 hash algorithm

Any help? Better yet, does anyone have actual code to make such requests they're willing to share?

NOTE: Dave Thomas solved this problem way back in 2007. But looks like Amazon has changed their request format:

http://pragdave.me/blog/2007/04/15/a-first-erlang-program/

Many thanks,

LRP




 



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