IdentityServer4 : apprendre comment authentifier l'utilisateur via notre propre service d'acc�s aux donn�es et comment d�finir les revendications de l'utilisateur,

Un billet d'Hinault Romaric

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public class CustomUser 
    { 
        public string SubjectId { get; set; } 
        public string UserName { get; set; } 
        public string Password { get; set; } 
        public string FirstName { get; set; } 
        public string Email { get; set; } 
    }

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public interface IUserRepository 
    { 
  
        CustomUser FindByUserName(string userName); 
  
        CustomUser FindBySubjectId(string subjectId); 
  
        bool ValidateCredentials(string userName, string password); 
    }

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public class UserRepository : IUserRepository 
    { 
  
        private List<CustomUser> _customUsers = new List<CustomUser> { 
            new CustomUser 
            { 
                SubjectId = "1111", 
                UserName = "alice", 
                FirstName = "Alice Smith", 
                Email = "AliceSmith@email.com", 
                Password = "alice" 
            }, 
            new CustomUser 
            { 
                 SubjectId = "2222", 
                 UserName = "bob", 
                FirstName = "Bob Smith", 
                Email = "BobSmith@email.com", 
                Password = "bob" 
            } 
        }; 
  
        public CustomUser FindBySubjectId(string subjectId) 
        { 
            return _customUsers.Find(x => x.SubjectId.Equals(subjectId)); 
        } 
  
        public CustomUser FindByUserName(string userName) 
        { 
            return _customUsers.Find(x=>x.UserName.Equals(userName)); 
        } 
  
        public bool ValidateCredentials(string userName, string password) 
        { 
            var customUser = FindByUserName(userName); 
            return customUser != null && customUser.Password.Equals(password); 
        } 
    }

services.AddTransient<IUserRepository, UserRepository>();

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private readonly IUserRepository _userRepository; 
  
        public AccountController( 
            IIdentityServerInteractionService interaction, 
            IClientStore clientStore, 
            IAuthenticationSchemeProvider schemeProvider, 
            IEventService events, 
           IUserRepository userRepository) 
        { 
  
            _interaction = interaction; 
            _clientStore = clientStore; 
            _schemeProvider = schemeProvider; 
            _events = events; 
            _userRepository = userRepository; 
        } 
  
        /// <summary> 
        /// Entry point into the login workflow 
        /// </summary> 
        [HttpGet] 
        public async Task<IActionResult> Login(string returnUrl) 
        { 
            // build a model so we know what to show on the login page 
            var vm = await BuildLoginViewModelAsync(returnUrl); 
  
            if (vm.IsExternalLoginOnly) 
            { 
                // we only have one option for logging in and it's an external provider 
                return RedirectToAction("Challenge", "External", new { provider = vm.ExternalLoginScheme, returnUrl }); 
            } 
  
            return View(vm); 
        } 
  
        /// <summary> 
        /// Handle postback from username/password login 
        /// </summary> 
        [HttpPost] 
        [ValidateAntiForgeryToken] 
        public async Task<IActionResult> Login(LoginInputModel model, string button) 
        { 
            // check if we are in the context of an authorization request 
            var context = await _interaction.GetAuthorizationContextAsync(model.ReturnUrl); 
  
            // the user clicked the "cancel" button 
            if (button != "login") 
            { 
                if (context != null) 
                { 
                    // if the user cancels, send a result back into IdentityServer as if they  
                    // denied the consent (even if this client does not require consent). 
                    // this will send back an access denied OIDC error response to the client. 
                    await _interaction.GrantConsentAsync(context, ConsentResponse.Denied); 
  
                    // we can trust model.ReturnUrl since GetAuthorizationContextAsync returned non-null 
                    if (await _clientStore.IsPkceClientAsync(context.ClientId)) 
                    { 
                        // if the client is PKCE then we assume it's native, so this change in how to 
                        // return the response is for better UX for the end user. 
                        return View("Redirect", new RedirectViewModel { RedirectUrl = model.ReturnUrl }); 
                    } 
  
                    return Redirect(model.ReturnUrl); 
                } 
                else 
                { 
                    // since we don't have a valid context, then we just go back to the home page 
                    return Redirect("~/"); 
                } 
            } 
  
            if (ModelState.IsValid) 
            { 
                // validate username/password against in-memory store 
  
                if (_userRepository.ValidateCredentials(model.Username, model.Password)) 
                { 
                    var user = _userRepository.FindByUserName(model.Username); 
                    await _events.RaiseAsync(new UserLoginSuccessEvent(user.UserName, user.SubjectId, user.UserName)); 
  
                    // only set explicit expiration here if user chooses "remember me".  
                    // otherwise we rely upon expiration configured in cookie middleware. 
                    AuthenticationProperties props = null; 
                    if (AccountOptions.AllowRememberLogin && model.RememberLogin) 
                    { 
                        props = new AuthenticationProperties 
                        { 
                            IsPersistent = true, 
                            ExpiresUtc = DateTimeOffset.UtcNow.Add(AccountOptions.RememberMeLoginDuration) 
                        }; 
                    }; 
  
                    // issue authentication cookie with subject ID and username 
                    await HttpContext.SignInAsync(user.SubjectId, user.UserName, props); 
  
                    if (context != null) 
                    { 
                        if (await _clientStore.IsPkceClientAsync(context.ClientId)) 
                        { 
                            // if the client is PKCE then we assume it's native, so this change in how to 
                            // return the response is for better UX for the end user. 
                            return View("Redirect", new RedirectViewModel { RedirectUrl = model.ReturnUrl }); 
                        } 
  
                        // we can trust model.ReturnUrl since GetAuthorizationContextAsync returned non-null 
                        return Redirect(model.ReturnUrl); 
                    } 
  
                    // request for a local page 
                    if (Url.IsLocalUrl(model.ReturnUrl)) 
                    { 
                        return Redirect(model.ReturnUrl); 
                    } 
                    else if (string.IsNullOrEmpty(model.ReturnUrl)) 
                    { 
                        return Redirect("~/"); 
                    } 
                    else 
                    { 
                        // user might have clicked on a malicious link - should be logged 
                        throw new Exception("invalid return URL"); 
                    } 
                } 
  
                await _events.RaiseAsync(new UserLoginFailureEvent(model.Username, "invalid credentials")); 
                ModelState.AddModelError("", AccountOptions.InvalidCredentialsErrorMessage); 
            }

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 public class ProfileService : IProfileService 
    { 
        private IUserRepository _userRepository { get; set; } 
        public ProfileService(IUserRepository userRepository) 
        { 
            _userRepository = userRepository; 
        } 
  
        public Task GetProfileDataAsync(ProfileDataRequestContext context) 
        { 
            var custormUser = _userRepository.FindBySubjectId(context.Subject.FindFirst(x => x.Type == "sub").Value); 
            if (custormUser != null) 
            { 
                context.IssuedClaims = GetClaims(custormUser); 
            } 
                return Task.FromResult(0); 
        } 
  
        public Task IsActiveAsync(IsActiveContext context) 
        { 
            return Task.FromResult(0); 
        } 
  
        private List<Claim> GetClaims(CustomUser customUser) => new List<Claim> { 
                new Claim(JwtClaimTypes.Name, customUser.UserName), 
                new Claim(JwtClaimTypes.FamilyName, customUser.FirstName), 
                new Claim(JwtClaimTypes.Email, customUser.Email) 
            }; 
    }

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  new Client 
                { 
                    ClientId = "consoleappclient", 
                    AllowedGrantTypes = GrantTypes.ResourceOwnerPassword, 
  
                    ClientSecrets = 
                    { 
                        new Secret("secret".Sha256()) 
                    }, 
                    AllowedScopes = { "testapi" } 
                },

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public class ResourceOwnerPasswordValidator : IResourceOwnerPasswordValidator 
    { 
        private IUserRepository _userRepository { get; set; } 
        public ResourceOwnerPasswordValidator(IUserRepository userRepository) 
        { 
            _userRepository = userRepository; 
        } 
  
        public Task ValidateAsync(ResourceOwnerPasswordValidationContext context) 
        { 
            var customUser = _userRepository.FindByUserName(context.UserName); 
            if (customUser != null && customUser.Password.Equals(context.Password)) 
            { 
                context.Result = new GrantValidationResult( 
                 subject: customUser.SubjectId, 
                 authenticationMethod: OidcConstants.AuthenticationMethods.Password); 
                  } 
            else 
            { 
                context.Result = new GrantValidationResult( 
                    TokenRequestErrors.InvalidGrant, 
                    "invalid credential"); 
  
            } 
            return Task.FromResult(0); 
        } 
  
  
    }

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      services.AddIdentityServer() 
                   .AddDeveloperSigningCredential() 
                   .AddInMemoryIdentityResources(Config.GetIdentityResources()) 
                    .AddInMemoryApiResources(Config.GetApiResources()) 
                      .AddResourceOwnerValidator<ResourceOwnerPasswordValidator>() 
                  .AddProfileService<ProfileService>();

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static async Task CallWebApiR() 
        { 
            // discover endpoints from metadata 
            var disco = await DiscoveryClient.GetAsync("https://localhost:5001"); 
            if (disco.IsError) 
            { 
                Console.WriteLine(disco.Error); 
                return; 
            } 
  
            // request token 
            var tokenClient = new TokenClient(disco.TokenEndpoint, "consoleappclient", "secret"); 
            var tokenResponse = await tokenClient.RequestResourceOwnerPasswordAsync("alice", "alice", "testapi"); 
  
            if (tokenResponse.IsError) 
            { 
                Console.WriteLine(tokenResponse.Error); 
                return; 
            } 
  
            Console.WriteLine(tokenResponse.Json); 
  
            // call api 
            var client = new HttpClient(); 
            client.SetBearerToken(tokenResponse.AccessToken); 
  
            var response = await client.GetAsync("https://localhost:5003/api/secure"); 
            if (!response.IsSuccessStatusCode) 
            { 
                Console.WriteLine(response.StatusCode); 
            } 
            else 
            { 
                var content = await response.Content.ReadAsStringAsync(); 
                Console.WriteLine(JArray.Parse(content)); 
            } 
        }