GitHub Apps Proof-of-Concept

[kfcampbell]

This PR is the .NET side of https://github.com/octokit/go-sdk/pull/69. It's a work in progress.

It's pending some discussion and decisions:

• How should the examples be structured?
• Are we comfortable using the GitHubJwt library?

[github-actions[bot]]

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[MatisseHack]

FWIW, it's pretty easy to generate JWTs with Microsoft.IdentityModel.JsonWebTokens if you'd prefer to take a dependency on a more "official" library:

using System.Security.Cryptography;
using Microsoft.IdentityModel.JsonWebTokens;
using Microsoft.IdentityModel.Tokens;

string CreateJsonWebToken(string clientId, string privateKey)
{
    var rsa = RSA.Create();
    rsa.ImportFromPem(privateKey);

    var now = DateTimeOffset.Now;
    var tokenDescriptor = new SecurityTokenDescriptor
    {
        Issuer = clientId,
        IssuedAt = now.UtcDateTime,
        NotBefore = now.UtcDateTime,
        Expires = now.AddMinutes(10).UtcDateTime,
        SigningCredentials = new(new RsaSecurityKey(rsa), SecurityAlgorithms.RsaSha256)
    };
    
    return new JsonWebTokenHandler().CreateToken(tokenDescriptor);
}

var token = CreateJsonWebToken("foo", "bar");

[kfcampbell]

@MatisseHack Ooh, I should probably swap over. I used the library I did because I was going off of the Octokit docs :grimacing:; perhaps we should change those as well?

[MatisseHack]

Good point! I've got nothing against GitHubJwt, but using Microsoft's library is easy enough that it might be wroth switching the recommendation in the docs.

[nickfloyd]

Closing in favor of: https://github.com/octokit/dotnet-sdk/pull/70