fix: add map support to request struct

[Hawatz]

Here we have a check for number and binary values, but what if we have a need to use maps in functions inside matcher expression

Convert maps to strings before passing it to request and back inside a function looks a bit tricky
Or maybe you have some reason to filter maps from request values?

[casbin-bot]

@tangyang9464 @closetool @sagilio please review

[CLAassistant]

All committers have signed the CLA.

[hsluoyz]

@Hawatz plz fix:

[Hawatz]

@hsluoyz
Done

[hsluoyz]

@ngoclinhng plz review

[ngoclinhng]

• Please follow the original coding-style (indentation: two white spaces, max-length: 80, etc...)
• Can you give us a (real world) example where you need to use a map inside a request?

[Hawatz]

Can you give us a (real world) example where you need to use a map inside a request?

[matchers]
m = ... && custom_function(r, p)

1. Inside custom_function we want to evaluate p.rule which can be r.user.id == p.user_id
   In that case, we can pass user_id directly to rule, but user_id is not the only field we want to check, especially when the user struct is nested
2. We have a policy with the check that affects two maps from request, but we want this check to be stored in policy, not in the actual codebase

[kuzaxak]

Can you give us a (real world) example where you need to use a map inside a request?

[matchers]
m = ... && custom_function(r, p)

1. Inside custom_function we want to evaluate p.rule which can be r.user.id == p.user_id
   In that case, we can pass user_id directly to rule, but user_id is not the only field we want to check, especially when the user struct is nested
2. We have a policy with the check that affects two maps from request, but we want this check to be stored in policy, not in the actual codebase

We want to use Eval rule inside a policy against full obgect in request. It is available in original casbin, here is example

Eval rull will have access to the user record and resources object to run ABAC model.

[ngoclinhng]

@hsluoyz you can merge these commits into master.

[github-actions]

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