CredentialsProvider.cs

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using LibGit2Sharp;
using LibGit2Sharp.Handlers;
using Microsoft.Extensions.Logging;
using System;
using Tgstation.Server.Host.Core;

namespace Tgstation.Server.Host.Components.Repository
{
    sealed class CredentialsProvider : ICredentialsProvider
    {
        readonly ILogger<CredentialsProvider> logger;

        public CredentialsProvider(ILogger<CredentialsProvider> logger)
        {
            this.logger = logger ?? throw new ArgumentNullException(nameof(logger));
        }

        public CredentialsHandler GenerateHandler(string username, string password) => (a, b, supportedCredentialTypes) =>
        {
            var hasCreds = username != null;
            var supportsUserPass = supportedCredentialTypes.HasFlag(SupportedCredentialTypes.UsernamePassword);
            var supportsAnonymous = supportedCredentialTypes.HasFlag(SupportedCredentialTypes.Default);

            logger.LogTrace("Credentials requested. Present: {0}. Supports anonymous: {1}. Supports user/pass: {2}", hasCreds, supportsAnonymous, supportsUserPass);
            if (supportsUserPass)
            {
                if (hasCreds)
                    return new UsernamePasswordCredentials
                    {
                        Username = username,
                        Password = password
                    };
            }

            if (supportsAnonymous)
                return new DefaultCredentials();

            if (hasCreds)
                throw new JobException("Remote does not support anonymous authentication!");

            throw new JobException("Server does not support anonymous or username/password authentication!");
        };
    }
}