added token date checks & signature is now forced to lowercase hex before validation.

[mhassman]

For some reason, i couldn't get token verification to work as-is..
signature = basexx.from_url64(str:sub(dotSecond+1)) was returning binary, but
['HS256'] = function(data, signature, key) return signature == tohex(hmac.new (key, 'sha256'):final (data)) end, was returning lowercase hex.
So, forced extracted message signature to lowercase hex.

Also, added token date (nbf, and exp) checks if they are defined within the token.

Hope this helps..

[DorianGray]

Would you mind adding some tests that describe the behavior and fail with the old code and then pass with the new?

[mhassman]

Hi Robert,

Apologies on delayed response - crazy week.

I'm happy to help, but not quite understanding what you're asking. Are you
asking to enhance the code for robustness? or something else?

fyi.. i committed a minor change that permits errors in json decode to flow
upward so they can be handled by the calling lua code. otherwise, nginx
fails with 500 error. I don't know if i should do another pull request? or
if you will see the second commit? Please advise..

Thnx!
:-)

-Mark

---

From: Robert Andrew Ditthardt [mailto:notifications@github.com]
Sent: Monday, June 13, 2016 8:06 PM
To: Olivine-Labs/lua-jwt
Cc: mhassman; Author
Subject: Re: [Olivine-Labs/lua-jwt] added token date checks & signature is
now forced to lowercase hex before validation. (#9)

Would you mind adding some tests that describe the behavior and fail with
the old code and then pass with the new?

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[DorianGray]

Specifically I'm asking for tests to be written in the spec folder so that running busted confirms that this code works. There are existing tests over all of the functionality in this library.

[moteus]

This PR add nginx as dependency.
I think better use os module for that.

[moteus]

I have idea to add options.checks table which will allows provide some arbitrary values (and may be functions). E.g. it can provide current timestamp to checks nbf and exp. Also e.g. server name to check iss.