added support for validating HS512 JWT tokens

[tejash-jl]

Added support for validating HS512 JWT tokens

Description

added a hs512 case to handle the tokens

Motivation and Context

We have JWT tokens signed by HS512 method. Its was throwing invalid signature. So had to add this extension

How Has This Been Tested?

I have added tests with valid HS512 signed tokens

[zhouzhuojie]

Thanks! Can you also update https://github.com/checkr/flagr/blob/master/pkg/config/env.go#L166?

[codecov-io]

Codecov Report

Merging #282 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #282      +/-   ##
=========================================
+ Coverage   81.76%   81.8%   +0.03%     
=========================================
  Files          26      26              
  Lines        1530    1533       +3     
=========================================
+ Hits         1251    1254       +3     
  Misses        210     210              
  Partials       69      69

Impacted Files	Coverage Δ
pkg/config/middleware.go	64.17% <100%> (+0.82%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0d7481b...646d893. Read the comment docs.

[tejash-jl]

Thanks! Can you also update https://github.com/checkr/flagr/blob/master/pkg/config/env.go#L166?

Updated

[zhouzhuojie]

btw, I don't think you need to set Config.JWTAuthDebug = true here, if so, please also unset it in the defer function.

[tejash-jl]

I have removed it.

[zhouzhuojie]

🎉

[tejash-jl]

@zhouzhuojie Can you deploy the latest changes to docker hub?

[zhouzhuojie]

@zhouzhuojie Can you deploy the latest changes to docker hub?

Done. Also opened an issue about auto release. #292