Create arrays of claims using user-jwts

[jontycg]

Summary

Support creating custom claims as an array type using the user-jwts tool.

Motivation and goals

• It is a common use case for JWTs to contain custom claims that are an array type. For example:

{
   "fooIds": [
         "427ba6fa-7e92-49ff-b180-944cf0c9e4b8",
         "708f0c8b-c982-47ce-8cfb-c31bc5bc7d73"
   ]
}

• While the user-jwts tool supports creating roles as an array, it does not currently support creating custom claims as an array.
• By adding this capability to the user-jwts tool, it will make it a convenient option for testing applications that do expect custom claims with array types.

In scope

Support for creating custom claims as an array.

Examples

dotnet user-jwts create --claim companies=company1 --claim companies=company2

This could result in a token with the claim:

{
   "companies": ["company1", "company2"]
}

By specifying each entry in the array as another --claim flag, it would function similar to how the --role flag currently works. If there is only one instance of the key, it would be a single value, and if there are multiple instances of the key, it would become an array.

Multiple Keys

dotnet user-jwts create --claim companies=company1 --claim companies=company2

Becomes:

{
   "companies": ["company1", "company2"]
}

Single Key

dotnet user-jwts create --claim company=company1

Becomes:

{
   "company": "company1"
}

Mixed Keys

dotnet user-jwts create --claim companies=company1 --claim companies=company2 --claim department=engineering

Becomes:

{
   "companies": ["company1", "company2"],
   "department": "engineering"
}

Existing Issues

#59671