❔ Identity Framework Users with OAuth clients.

    [HttpPost("exchange-token/github", Name = "ExchangeGithubToken")]
    public async Task<ActionResult<ExchangeTokenResponse>> ExchangeGithubToken([FromBody] ExchangeTokenRequest request)
    {
        var result = await _authenticationService.ExchangeGithubToken(request);

        return Ok(result);
    }

    public async Task<ExchangeTokenResponse> ExchangeGithubToken(ExchangeTokenRequest request)
    {
        var httpClient = _httpClientFactory.CreateClient("Github");
        
        httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", request.Token);

        var response = await httpClient.GetAsync("/user");

        if (!response.IsSuccessStatusCode) throw new NotImplementedException();
        
        var content = await response.Content.ReadAsStringAsync();

        var user = JsonSerializer.Deserialize<GithubUser>(content);
            
        var token = _jwtTokenGenerator.GenerateToken(user.Id.ToString(), user.Login);
            
        return new ExchangeTokenResponse(token);
    }