IdentityServer4原始碼決議_1_專案結構
IdentityServer4原始碼決議_2_元資料介面
IdentityServer4原始碼決議_3_認證介面
IdentityServer4原始碼決議_4_令牌發放介面
IdentityServer4原始碼決議_5_查詢用戶資訊介面
[IdentityServer4原始碼決議_6_結束會話介面]
[IdentityServer4原始碼決議_7_查詢令牌資訊介面]
[IdentityServer4原始碼決議_8_撤銷令牌介面]

協議

Token介面

oidc服務需要提供token介面，提供AccessToken,IdToken,以及RefreshToken（可選），在授權碼模式下，token介面必須使用https，

請求

必須使用POST方法，使用x-www-form-urlencoded序列化引數，clientId:clientSecret使用Basic加密放在Authorization頭中

POST /token HTTP/1.1
Host: server.example.com
Content-Type: application/x-www-form-urlencoded
Authorization: Basic czZCaGRSa3F0MzpnWDFmQmF0M2JW

grant_type=authorization_code&code=SplxlOBeZQQYbYS6WxSbIA
&redirect_uri=https%3A%2F%2Fclient.example.org%2Fcb

請求校驗

認證服務必須校驗下列內容：

驗證client是否頒發了秘鑰
驗證為該客戶端頒發了授權碼
驗證授權碼有效性
如果可能的話，驗證授權碼是否被使用過
驗證redirect_uri 與發起認證請求時的值一致

成功回應

在收到token請求，并校驗通過之后，認證服務回傳成功報文，報文包含了身份令牌和通行令牌，資料格式使用application/json，token_type必須回傳Bearer，其他型別token不在本協議范圍內，在OAuth2.0回應報文基礎上，oidc增加了id_tken，所有token包含了token或者其他敏感資訊的回應報文，必須包含以下回應頭，

Cache-Control no-store
Pragma no-cache

失敗回應

如果認證失敗回傳application/json格式錯誤訊息，狀態碼400

  HTTP/1.1 400 Bad Request
  Content-Type: application/json
  Cache-Control: no-store
  Pragma: no-cache

  {
   "error": "invalid_request"
  }

id token校驗

客戶端必須校驗回傳的id token, 校驗條件如下，對照這些條件，就可以更懂Microsoft.Authentication.OpenIdConnect里面的代碼了，要做的事情很多，

如果id token被加密，使用客戶端注冊時候約定的秘鑰和演算法解密，如果約定了加密方式，id token未被加密，客戶端應該拒絕，
簽發方標識必須與iss宣告一致
客戶端必須校驗aud宣告包含了它的客戶端id，如果id token未回傳正確的audience或者反悔了不被新人的audience，應該拒絕
如果id token包含多個audience，需要校驗是否有azp宣告，azp即Authorized party，標識被授權的client，
如果包含azp宣告，客戶端需要校驗其值是否為自己的客戶端id
如果id token由token介面直接頒發給客戶端（授權碼模式就是如此），客戶端必須根據alg引數值的演算法驗證簽名，客戶端必須使用簽發方提供的秘鑰，
alg值默認為RS256，客戶端可以在注冊的時候使用id_token_signed_response_alg引數指定配置，
如果jwt的alg頭使用了基于mac地址的加密演算法，如HS256, HS384,HS512，aud宣告中的位元組會用作驗簽，（意思是會把mac地址相關資訊寫在aud宣告上？）
The current time MUST be before the time represented by the exp Claim.
當前時間必須早于exp（token過期時間），
iat（簽發時間）可以用于拒絕過早、或者過于頻繁簽發的token，可以用于預防重放攻擊，可接受時間范圍由客戶端自行決定，
如果認證請求包含了nonce引數，客戶端必須交驗認證回應中回傳的nonce值是否一致，防止重放攻擊，
如果客戶端請求了acr宣告（Authentication Context Class Reference，認證會話背景關系，用于表示當前認證會話），必須交驗acr值是否合法，
如果客戶端請求了auth_time宣告，客戶端應該校驗認證時間是否已經超出，是否需要重新認證，

access token校驗

如果id_token中包含了at_hash宣告，需要做下面的校驗，at_hash標明了access_token和id_token之間的會話關聯關系，做這個校驗可以防跨站偽造，

用idtoken的alg頭標明的演算法加密access_token，比如alg位RS256，則是用HSA-256演算法加密，
取hash值左邊一般使用base64url加密
id token中的at_hash值必須跟上個步驟得到的值一致

校驗規則很多，了解一下即可，絕大部分屬于客戶端需要做的部分，絕大部分跟安全有關，這一塊的實作可以參考Microsoft.Authentication.OpenIdConnect，這是客戶端的實作，我們現在看的IdentityServer是認證服務端的實作，

原始碼

五種授權模式

有下面幾種授權模式可以請求token介面

授權碼模式：最常用的code換token
混合模式：混合模式是授權碼模式+簡化模式混合使用的方式，在用授權碼code找token介面換通行/身份令牌的邏輯與授權碼模式的邏輯是一樣的，idsv4中，混合模式沒有自己的單獨實作，只是把授權碼+簡化模式的代碼同時呼叫，
客戶端密鑰模式：一般用于完全信任的內部系統，密鑰換取access_token，由于沒有用戶參與，scope包含open_id是非法的
用戶名密碼模式：一般用于第三方對接、無界面互動場景，即username+password換token/id_token，password不一定是密碼，也可以是驗證碼或其他的什么東西，這個完全取決于開發自己的實作
設備流模式（略）

注意：簡化模式所有的token都是由認證介面（authorize）一次性回傳的，不能使用token介面，

校驗請求方法

token介面僅允許POST方法，Content-Type必須為application/x-www-form-urlencoded，否則拋出InvalidRequest錯誤，

public async Task<IEndpointResult> ProcessAsync(HttpContext context)
    {
        _logger.LogTrace("Processing token request.");

        // validate HTTP
        if (!HttpMethods.IsPost(context.Request.Method) || !context.Request.HasFormContentType)
        {
            _logger.LogWarning("Invalid HTTP request for token endpoint");
            return Error(OidcConstants.TokenErrors.InvalidRequest);
        }

        return await ProcessTokenRequestAsync(context);
    }

處理流程

校驗客戶端
校驗請求引數
創建回傳值
回傳結果

private async Task<IEndpointResult> ProcessTokenRequestAsync(HttpContext context)
{
    _logger.LogDebug("Start token request.");

    // validate client
    var clientResult = await _clientValidator.ValidateAsync(context);

    if (clientResult.Client == null)
    {
        return Error(OidcConstants.TokenErrors.InvalidClient);
    }

    // validate request
    var form = (await context.Request.ReadFormAsync()).AsNameValueCollection();
    _logger.LogTrace("Calling into token request validator: {type}", _requestValidator.GetType().FullName);
    var requestResult = await _requestValidator.ValidateRequestAsync(form, clientResult);

    if (requestResult.IsError)
    {
        await _events.RaiseAsync(new TokenIssuedFailureEvent(requestResult));
        return Error(requestResult.Error, requestResult.ErrorDescription, requestResult.CustomResponse);
    }

    // create response
    _logger.LogTrace("Calling into token request response generator: {type}", _responseGenerator.GetType().FullName);
    var response = await _responseGenerator.ProcessAsync(requestResult);

    await _events.RaiseAsync(new TokenIssuedSuccessEvent(response, requestResult));
    LogTokens(response, requestResult);

    // return result
    _logger.LogDebug("Token request success.");
    return new TokenResult(response);
}

校驗客戶端

解碼客戶端秘鑰，對應的處理類是BasicAuthenticationSecretParser，客戶端id和秘鑰用base64url加密方法放在Authorzaition頭上，base64url基本是明文的，因為授權碼換token是后端進行的，所以安全性沒有問題
解碼得到客戶端id和秘鑰之后，跟store對比校驗客戶端是否存在，秘鑰是否一致，

public async Task<ClientSecretValidationResult> ValidateAsync(HttpContext context)
{
    _logger.LogDebug("Start client validation");

    var fail = new ClientSecretValidationResult
    {
        IsError = true
    };

    var parsedSecret = await _parser.ParseAsync(context);
    if (parsedSecret == null)
    {
        await RaiseFailureEventAsync("unknown", "No client id found");

        _logger.LogError("No client identifier found");
        return fail;
    }

    // load client
    var client = await _clients.FindEnabledClientByIdAsync(parsedSecret.Id);
    if (client == null)
    {
        await RaiseFailureEventAsync(parsedSecret.Id, "Unknown client");

        _logger.LogError("No client with id '{clientId}' found. aborting", parsedSecret.Id);
        return fail;
    }

    SecretValidationResult secretValidationResult = null;
    if (!client.RequireClientSecret || client.IsImplicitOnly())
    {
        _logger.LogDebug("Public Client - skipping secret validation success");
    }
    else
    {
        secretValidationResult = await _validator.ValidateAsync(parsedSecret, client.ClientSecrets);
        if (secretValidationResult.Success == false)
        {
            await RaiseFailureEventAsync(client.ClientId, "Invalid client secret");
            _logger.LogError("Client secret validation failed for client: {clientId}.", client.ClientId);

            return fail;
        }
    }

    _logger.LogDebug("Client validation success");

    var success = new ClientSecretValidationResult
    {
        IsError = false,
        Client = client,
        Secret = parsedSecret,
        Confirmation = secretValidationResult?.Confirmation
    };

    await RaiseSuccessEventAsync(client.ClientId, parsedSecret.Type);
    return success;
}

校驗請求引數

客戶端的PortocalType必須位oidc，否則報錯InvalidClient
校驗GrantType，必填，長度不能超過100，
GrantType默認支持以下幾種型別，還可以自定義GrantType
- authorization_code：授權碼換token
- client_credentials：客戶端秘鑰換token
- password：用戶名密碼換token
- refresn_token：重繪令牌換token
- urn:ietf:params:oauth:grant-type:device_code：deviceflow，略

public async Task<TokenRequestValidationResult> ValidateRequestAsync(NameValueCollection parameters, ClientSecretValidationResult clientValidationResult)
{
    _logger.LogDebug("Start token request validation");

    _validatedRequest = new ValidatedTokenRequest
    {
        Raw = parameters ?? throw new ArgumentNullException(nameof(parameters)),
        Options = _options
    };

    if (clientValidationResult == null) throw new ArgumentNullException(nameof(clientValidationResult));

    _validatedRequest.SetClient(clientValidationResult.Client, clientValidationResult.Secret, clientValidationResult.Confirmation);

    /////////////////////////////////////////////
    // check client protocol type
    /////////////////////////////////////////////
    if (_validatedRequest.Client.ProtocolType != IdentityServerConstants.ProtocolTypes.OpenIdConnect)
    {
        LogError("Invalid protocol type for client",
            new
            {
                clientId = _validatedRequest.Client.ClientId,
                expectedProtocolType = IdentityServerConstants.ProtocolTypes.OpenIdConnect,
                actualProtocolType = _validatedRequest.Client.ProtocolType
            });

        return Invalid(OidcConstants.TokenErrors.InvalidClient);
    }

    /////////////////////////////////////////////
    // check grant type
    /////////////////////////////////////////////
    var grantType = parameters.Get(OidcConstants.TokenRequest.GrantType);
    if (grantType.IsMissing())
    {
        LogError("Grant type is missing");
        return Invalid(OidcConstants.TokenErrors.UnsupportedGrantType);
    }

    if (grantType.Length > _options.InputLengthRestrictions.GrantType)
    {
        LogError("Grant type is too long");
        return Invalid(OidcConstants.TokenErrors.UnsupportedGrantType);
    }

    _validatedRequest.GrantType = grantType;

    switch (grantType)
    {
        case OidcConstants.GrantTypes.AuthorizationCode:
            return await RunValidationAsync(ValidateAuthorizationCodeRequestAsync, parameters);
        case OidcConstants.GrantTypes.ClientCredentials:
            return await RunValidationAsync(ValidateClientCredentialsRequestAsync, parameters);
        case OidcConstants.GrantTypes.Password:
            return await RunValidationAsync(ValidateResourceOwnerCredentialRequestAsync, parameters);
        case OidcConstants.GrantTypes.RefreshToken:
            return await RunValidationAsync(ValidateRefreshTokenRequestAsync, parameters);
        case OidcConstants.GrantTypes.DeviceCode:
            return await RunValidationAsync(ValidateDeviceCodeRequestAsync, parameters);
        default:
            return await RunValidationAsync(ValidateExtensionGrantRequestAsync, parameters);
    }
}

引數校驗 - 授權碼模式

客戶端AllowedGrantTypes必須包含authorization_code或者hybrid,否則報錯UnauthorizedClient，
code必填，code長度不能超過100
客戶端傳過來的code只是授權碼的id，從store中取出來授權碼物件，如果不存在回傳錯誤InvalidGrant
從store中移除授權碼，此處實作了code只是用一次
如果授權碼超出有效時長，回傳錯誤invalidGrant
校驗授權碼物件的客戶端id與當前客戶端是否一致
redirect_uri必填，且必須與授權碼物件保存的redirect_uri一致，否則回傳錯誤UnauthorizedClient
如果請求中沒有任何scope，回傳錯誤invalidRequest
判斷用戶是否啟用，這個判斷是由可插拔服務IProfileService的IsActive方法來實作的，開發可以注入自己的實作，如果用戶禁用將回傳錯誤InvalidGrant，

private async Task<TokenRequestValidationResult> ValidateAuthorizationCodeRequestAsync(NameValueCollection parameters)
    {
        _logger.LogDebug("Start validation of authorization code token request");

        /////////////////////////////////////////////
        // check if client is authorized for grant type
        /////////////////////////////////////////////
        if (!_validatedRequest.Client.AllowedGrantTypes.ToList().Contains(GrantType.AuthorizationCode) &&
            !_validatedRequest.Client.AllowedGrantTypes.ToList().Contains(GrantType.Hybrid))
        {
            LogError("Client not authorized for code flow");
            return Invalid(OidcConstants.TokenErrors.UnauthorizedClient);
        }

        /////////////////////////////////////////////
        // validate authorization code
        /////////////////////////////////////////////
        var code = parameters.Get(OidcConstants.TokenRequest.Code);
        if (code.IsMissing())
        {
            LogError("Authorization code is missing");
            return Invalid(OidcConstants.TokenErrors.InvalidGrant);
        }

        if (code.Length > _options.InputLengthRestrictions.AuthorizationCode)
        {
            LogError("Authorization code is too long");
            return Invalid(OidcConstants.TokenErrors.InvalidGrant);
        }

        _validatedRequest.AuthorizationCodeHandle = code;

        var authZcode = await _authorizationCodeStore.GetAuthorizationCodeAsync(code);
        if (authZcode == null)
        {
            LogError("Invalid authorization code", new { code });
            return Invalid(OidcConstants.TokenErrors.InvalidGrant);
        }

        await _authorizationCodeStore.RemoveAuthorizationCodeAsync(code);

        if (authZcode.CreationTime.HasExceeded(authZcode.Lifetime, _clock.UtcNow.UtcDateTime))
        {
            LogError("Authorization code expired", new { code });
            return Invalid(OidcConstants.TokenErrors.InvalidGrant);
        }

        /////////////////////////////////////////////
        // populate session id
        /////////////////////////////////////////////
        if (authZcode.SessionId.IsPresent())
        {
            _validatedRequest.SessionId = authZcode.SessionId;
        }

        /////////////////////////////////////////////
        // validate client binding
        /////////////////////////////////////////////
        if (authZcode.ClientId != _validatedRequest.Client.ClientId)
        {
            LogError("Client is trying to use a code from a different client", new { clientId = _validatedRequest.Client.ClientId, codeClient = authZcode.ClientId });
            return Invalid(OidcConstants.TokenErrors.InvalidGrant);
        }

        /////////////////////////////////////////////
        // validate code expiration
        /////////////////////////////////////////////
        if (authZcode.CreationTime.HasExceeded(_validatedRequest.Client.AuthorizationCodeLifetime, _clock.UtcNow.UtcDateTime))
        {
            LogError("Authorization code is expired");
            return Invalid(OidcConstants.TokenErrors.InvalidGrant);
        }

        _validatedRequest.AuthorizationCode = authZcode;
        _validatedRequest.Subject = authZcode.Subject;

        /////////////////////////////////////////////
        // validate redirect_uri
        /////////////////////////////////////////////
        var redirectUri = parameters.Get(OidcConstants.TokenRequest.RedirectUri);
        if (redirectUri.IsMissing())
        {
            LogError("Redirect URI is missing");
            return Invalid(OidcConstants.TokenErrors.UnauthorizedClient);
        }

        if (redirectUri.Equals(_validatedRequest.AuthorizationCode.RedirectUri, StringComparison.Ordinal) == false)
        {
            LogError("Invalid redirect_uri", new { redirectUri, expectedRedirectUri = _validatedRequest.AuthorizationCode.RedirectUri });
            return Invalid(OidcConstants.TokenErrors.UnauthorizedClient);
        }

        /////////////////////////////////////////////
        // validate scopes are present
        /////////////////////////////////////////////
        if (_validatedRequest.AuthorizationCode.RequestedScopes == null ||
            !_validatedRequest.AuthorizationCode.RequestedScopes.Any())
        {
            LogError("Authorization code has no associated scopes");
            return Invalid(OidcConstants.TokenErrors.InvalidRequest);
        }

        /////////////////////////////////////////////
        // validate PKCE parameters
        /////////////////////////////////////////////
        var codeVerifier = parameters.Get(OidcConstants.TokenRequest.CodeVerifier);
        if (_validatedRequest.Client.RequirePkce || _validatedRequest.AuthorizationCode.CodeChallenge.IsPresent())
        {
            _logger.LogDebug("Client required a proof key for code exchange. Starting PKCE validation");

            var proofKeyResult = ValidateAuthorizationCodeWithProofKeyParameters(codeVerifier, _validatedRequest.AuthorizationCode);
            if (proofKeyResult.IsError)
            {
                return proofKeyResult;
            }

            _validatedRequest.CodeVerifier = codeVerifier;
        }
        else
        {
            if (codeVerifier.IsPresent())
            {
                LogError("Unexpected code_verifier: {codeVerifier}. This happens when the client is trying to use PKCE, but it is not enabled. Set RequirePkce to true.", codeVerifier);
                return Invalid(OidcConstants.TokenErrors.InvalidGrant);
            }
        }

        /////////////////////////////////////////////
        // make sure user is enabled
        /////////////////////////////////////////////
        var isActiveCtx = new IsActiveContext(_validatedRequest.AuthorizationCode.Subject, _validatedRequest.Client, IdentityServerConstants.ProfileIsActiveCallers.AuthorizationCodeValidation);
        await _profile.IsActiveAsync(isActiveCtx);

        if (isActiveCtx.IsActive == false)
        {
            LogError("User has been disabled", new { subjectId = _validatedRequest.AuthorizationCode.Subject.GetSubjectId() });
            return Invalid(OidcConstants.TokenErrors.InvalidGrant);
        }

        _logger.LogDebug("Validation of authorization code token request success");

        return Valid();
    }

引數校驗 - 客戶端秘鑰模式

校驗Client是否允許使用客戶端秘鑰認證模式
校驗客戶端是否允許訪問請求的授權范圍scope
scope中包含openid的話回傳錯誤invlidScope，因為本模式沒有涉及用戶資訊
cope中包含offline_access則回傳錯誤InvalidScope，本模式不允許使用refresh_token

private async Task<TokenRequestValidationResult> ValidateClientCredentialsRequestAsync(NameValueCollection parameters)
    {
        _logger.LogDebug("Start client credentials token request validation");

        /////////////////////////////////////////////
        // check if client is authorized for grant type
        /////////////////////////////////////////////
        if (!_validatedRequest.Client.AllowedGrantTypes.ToList().Contains(GrantType.ClientCredentials))
        {
            LogError("Client not authorized for client credentials flow, check the AllowedGrantTypes setting", new { clientId = _validatedRequest.Client.ClientId });
            return Invalid(OidcConstants.TokenErrors.UnauthorizedClient);
        }

        /////////////////////////////////////////////
        // check if client is allowed to request scopes
        /////////////////////////////////////////////
        if (!await ValidateRequestedScopesAsync(parameters, ignoreImplicitIdentityScopes: true, ignoreImplicitOfflineAccess: true))
        {
            return Invalid(OidcConstants.TokenErrors.InvalidScope);
        }

        if (_validatedRequest.ValidatedScopes.ContainsOpenIdScopes)
        {
            LogError("Client cannot request OpenID scopes in client credentials flow", new { clientId = _validatedRequest.Client.ClientId });
            return Invalid(OidcConstants.TokenErrors.InvalidScope);
        }

        if (_validatedRequest.ValidatedScopes.ContainsOfflineAccessScope)
        {
            LogError("Client cannot request a refresh token in client credentials flow", new { clientId = _validatedRequest.Client.ClientId });
            return Invalid(OidcConstants.TokenErrors.InvalidScope);
        }

        _logger.LogDebug("{clientId} credentials token request validation success", _validatedRequest.Client.ClientId);
        return Valid();
    }

引數校驗 - 用戶名密碼模式

校驗客戶端是否允許使用用戶名密碼模式，校驗失敗回傳UnauthoriedClient錯誤
校驗客戶端是否有權訪問所請求的所有scope，校驗失敗回傳InvalidScope錯誤
從請求中獲取username和password引數，未提供username回傳InvalidGrant錯誤，未提供password則設定password位空值
username和password長度不能超過100，否則回傳InvalidGrant錯誤
使用IResourceOwnerPasswordValidator校驗username和password，此介面需要開發實作后注入，否則會拋出例外
GrantValidationResult的Subject不能為null，因此開發的IResourceOwnerPasswordValidator實作，校驗成功后必須給GrantValidationResult賦值
校驗用戶是否禁用，根據可插拔服務IProfileService的IsAcrtive方法判斷，如果禁用回傳IvalidGrant錯誤，

private async Task<TokenRequestValidationResult> ValidateResourceOwnerCredentialRequestAsync(NameValueCollection parameters)
{
    _logger.LogDebug("Start resource owner password token request validation");

    /////////////////////////////////////////////
    // check if client is authorized for grant type
    /////////////////////////////////////////////
    if (!_validatedRequest.Client.AllowedGrantTypes.Contains(GrantType.ResourceOwnerPassword))
    {
        LogError("Client not authorized for resource owner flow, check the AllowedGrantTypes setting", new { client_id = _validatedRequest.Client.ClientId });
        return Invalid(OidcConstants.TokenErrors.UnauthorizedClient);
    }

    /////////////////////////////////////////////
    // check if client is allowed to request scopes
    /////////////////////////////////////////////
    if (!(await ValidateRequestedScopesAsync(parameters)))
    {
        return Invalid(OidcConstants.TokenErrors.InvalidScope);
    }

    /////////////////////////////////////////////
    // check resource owner credentials
    /////////////////////////////////////////////
    var userName = parameters.Get(OidcConstants.TokenRequest.UserName);
    var password = parameters.Get(OidcConstants.TokenRequest.Password);

    if (userName.IsMissing())
    {
        LogError("Username is missing");
        return Invalid(OidcConstants.TokenErrors.InvalidGrant);
    }

    if (password.IsMissing())
    {
        password = "";
    }

    if (userName.Length > _options.InputLengthRestrictions.UserName ||
        password.Length > _options.InputLengthRestrictions.Password)
    {
        LogError("Username or password too long");
        return Invalid(OidcConstants.TokenErrors.InvalidGrant);
    }

    _validatedRequest.UserName = userName;


    /////////////////////////////////////////////
    // authenticate user
    /////////////////////////////////////////////
    var resourceOwnerContext = new ResourceOwnerPasswordValidationContext
    {
        UserName = userName,
        Password = password,
        Request = _validatedRequest
    };
    await _resourceOwnerValidator.ValidateAsync(resourceOwnerContext);

    if (resourceOwnerContext.Result.IsError)
    {
        // protect against bad validator implementations
        resourceOwnerContext.Result.Error = resourceOwnerContext.Result.Error ?? OidcConstants.TokenErrors.InvalidGrant;

        if (resourceOwnerContext.Result.Error == OidcConstants.TokenErrors.UnsupportedGrantType)
        {
            LogError("Resource owner password credential grant type not supported");
            await RaiseFailedResourceOwnerAuthenticationEventAsync(userName, "password grant type not supported", resourceOwnerContext.Request.Client.ClientId);

            return Invalid(OidcConstants.TokenErrors.UnsupportedGrantType, customResponse: resourceOwnerContext.Result.CustomResponse);
        }

        var errorDescription = "invalid_username_or_password";

        if (resourceOwnerContext.Result.ErrorDescription.IsPresent())
        {
            errorDescription = resourceOwnerContext.Result.ErrorDescription;
        }

        LogInformation("User authentication failed: ", errorDescription ?? resourceOwnerContext.Result.Error);
        await RaiseFailedResourceOwnerAuthenticationEventAsync(userName, errorDescription, resourceOwnerContext.Request.Client.ClientId);

        return Invalid(resourceOwnerContext.Result.Error, errorDescription, resourceOwnerContext.Result.CustomResponse);
    }

    if (resourceOwnerContext.Result.Subject == null)
    {
        var error = "User authentication failed: no principal returned";
        LogError(error);
        await RaiseFailedResourceOwnerAuthenticationEventAsync(userName, error, resourceOwnerContext.Request.Client.ClientId);

        return Invalid(OidcConstants.TokenErrors.InvalidGrant);
    }

    /////////////////////////////////////////////
    // make sure user is enabled
    /////////////////////////////////////////////
    var isActiveCtx = new IsActiveContext(resourceOwnerContext.Result.Subject, _validatedRequest.Client, IdentityServerConstants.ProfileIsActiveCallers.ResourceOwnerValidation);
    await _profile.IsActiveAsync(isActiveCtx);

    if (isActiveCtx.IsActive == false)
    {
        LogError("User has been disabled", new { subjectId = resourceOwnerContext.Result.Subject.GetSubjectId() });
        await RaiseFailedResourceOwnerAuthenticationEventAsync(userName, "user is inactive", resourceOwnerContext.Request.Client.ClientId);

        return Invalid(OidcConstants.TokenErrors.InvalidGrant);
    }

    _validatedRequest.UserName = userName;
    _validatedRequest.Subject = resourceOwnerContext.Result.Subject;

    await RaiseSuccessfulResourceOwnerAuthenticationEventAsync(userName, resourceOwnerContext.Result.Subject.GetSubjectId(), resourceOwnerContext.Request.Client.ClientId);
    _logger.LogDebug("Resource owner password token request validation success.");
    return Valid(resourceOwnerContext.Result.CustomResponse);
}

引數校驗 - RefreshToken

RefreshToken-重繪令牌，顧名思義，用于重繪通行令牌的憑證，擁有offline_access權限的客戶端可以使用重繪令牌，只有授權碼、混合流程等由后端參與的授權模式才允許使用重繪令牌，

從請求中獲取refresh_token引數值，如果為空則回傳InvalidRequest錯誤
如果重繪令牌長度超過100，回傳InvalidGrant錯誤
判斷重繪令牌是否存在且有效
- 是否能從store中查詢到重繪令牌物件
- 校驗重繪令牌是否過期
- 校驗重繪令牌是否屬于當前客戶端
- 校驗客戶端是否仍然有offline_access權限
- 校驗用戶是否被禁用

private async Task<TokenRequestValidationResult> ValidateRefreshTokenRequestAsync(NameValueCollection parameters)
{
    _logger.LogDebug("Start validation of refresh token request");

    var refreshTokenHandle = parameters.Get(OidcConstants.TokenRequest.RefreshToken);
    if (refreshTokenHandle.IsMissing())
    {
        LogError("Refresh token is missing");
        return Invalid(OidcConstants.TokenErrors.InvalidRequest);
    }

    if (refreshTokenHandle.Length > _options.InputLengthRestrictions.RefreshToken)
    {
        LogError("Refresh token too long");
        return Invalid(OidcConstants.TokenErrors.InvalidGrant);
    }

    var result = await _tokenValidator.ValidateRefreshTokenAsync(refreshTokenHandle, _validatedRequest.Client);

    if (result.IsError)
    {
        LogWarning("Refresh token validation failed. aborting");
        return Invalid(OidcConstants.TokenErrors.InvalidGrant);
    }

    _validatedRequest.RefreshToken = result.RefreshToken;
    _validatedRequest.RefreshTokenHandle = refreshTokenHandle;
    _validatedRequest.Subject = result.RefreshToken.Subject;

    _logger.LogDebug("Validation of refresh token request success");
    return Valid();
}

生成回應報文 - 授權碼模式

生成accessToken和refreshToken
- 通行令牌由ITokenService介面，默認實作DefaultTokenService的CreateAccessTokenAsync方法生成
- 如果請求了offline_access才生成refresh_token
- 如果code是oidc授權碼，生成id_token，DefaultTokenService的CreateIdentityTokenAsync方法生成Token物件，CreateSecurityTokenAsync方法將Token物件加密為jwt，

protected virtual async Task<TokenResponse> ProcessAuthorizationCodeRequestAsync(TokenRequestValidationResult request)
    {
        Logger.LogTrace("Creating response for authorization code request");

        //////////////////////////
        // access token
        /////////////////////////
        (var accessToken, var refreshToken) = await CreateAccessTokenAsync(request.ValidatedRequest);
        var response = new TokenResponse
        {
            AccessToken = accessToken,
            AccessTokenLifetime = request.ValidatedRequest.AccessTokenLifetime,
            Custom = request.CustomResponse,
            Scope = request.ValidatedRequest.AuthorizationCode.RequestedScopes.ToSpaceSeparatedString(),
        };

        //////////////////////////
        // refresh token
        /////////////////////////
        if (refreshToken.IsPresent())
        {
            response.RefreshToken = refreshToken;
        }

        //////////////////////////
        // id token
        /////////////////////////
        if (request.ValidatedRequest.AuthorizationCode.IsOpenId)
        {
            // load the client that belongs to the authorization code
            Client client = null;
            if (request.ValidatedRequest.AuthorizationCode.ClientId != null)
            {
                client = await Clients.FindEnabledClientByIdAsync(request.ValidatedRequest.AuthorizationCode.ClientId);
            }
            if (client == null)
            {
                throw new InvalidOperationException("Client does not exist anymore.");
            }

            var resources = await Resources.FindEnabledResourcesByScopeAsync(request.ValidatedRequest.AuthorizationCode.RequestedScopes);

            var tokenRequest = new TokenCreationRequest
            {
                Subject = request.ValidatedRequest.AuthorizationCode.Subject,
                Resources = resources,
                Nonce = request.ValidatedRequest.AuthorizationCode.Nonce,
                AccessTokenToHash = response.AccessToken,
                StateHash = request.ValidatedRequest.AuthorizationCode.StateHash,
                ValidatedRequest = request.ValidatedRequest
            };

            var idToken = await TokenService.CreateIdentityTokenAsync(tokenRequest);
            var jwt = await TokenService.CreateSecurityTokenAsync(idToken);
            response.IdentityToken = jwt;
        }

        return response;
    }

生成回應報文 - 客戶端密鑰模式

僅生成accessToken

protected virtual Task<TokenResponse> ProcessClientCredentialsRequestAsync(TokenRequestValidationResult request)
{
    Logger.LogTrace("Creating response for client credentials request");

    return ProcessTokenRequestAsync(request);
}

protected virtual async Task<TokenResponse> ProcessTokenRequestAsync(TokenRequestValidationResult validationResult)
    {
        (var accessToken, var refreshToken) = await CreateAccessTokenAsync(validationResult.ValidatedRequest);
        var response = new TokenResponse
        {
            AccessToken = accessToken,
            AccessTokenLifetime = validationResult.ValidatedRequest.AccessTokenLifetime,
            Custom = validationResult.CustomResponse,
            Scope = validationResult.ValidatedRequest.Scopes.ToSpaceSeparatedString()
        };

        if (refreshToken.IsPresent())
        {
            response.RefreshToken = refreshToken;
        }

        return response;
    }

生成回應報文 - 用戶名密碼模式

生成accessToken
如果申請了offline_access且有權限，同時回傳refresh_token
不會回傳id_token，我理解的是授權碼等模式是有限授權，需要code換id_token，才能拿到用戶id以及其他的基本資訊，而密碼模式是完全信任授權，賬號密碼都給你了，還整id_token干嘛，你要啥資訊，自己實作IResourceOwnerPasswordValidator，自己去庫里取就完事了，還要啥自行車，

protected virtual Task<TokenResponse> ProcessPasswordRequestAsync(TokenRequestValidationResult request)
    {
        Logger.LogTrace("Creating response for password request");

        return ProcessTokenRequestAsync(request);
    }

生成回應報文 - 重繪令牌

從請求中取出舊通行令牌
判斷客戶端配置UpdateAccessTokenClaimsOnRefresh-是否在重繪令牌的時候更新通行令牌的claims，默認false，如果為true，則創建新的token物件，否則使用舊的token，只是重繪token的創建時間和有效時間，
判斷客戶端配置RefreshTokenUsage - 重繪令牌用法，0：ReUse可重復使用 1：OnTimeOnly一次性，默認1，如果是一次性的話，從store中洗掉舊的重繪令牌，創建新的重繪令牌，
判斷客戶端配置RefreshTokenExpiration - 重繪令牌過期型別，0：Sliding，1：Absolute，默認1，如果是0，需要重新計算相對時間，
如果重繪令牌請求包含了任意身份資源，創建新的身份令牌，

protected virtual async Task<TokenResponse> ProcessRefreshTokenRequestAsync(TokenRequestValidationResult request)
    {
        Logger.LogTrace("Creating response for refresh token request");

        var oldAccessToken = request.ValidatedRequest.RefreshToken.AccessToken;
        string accessTokenString;

        if (request.ValidatedRequest.Client.UpdateAccessTokenClaimsOnRefresh)
        {
            var subject = request.ValidatedRequest.RefreshToken.Subject;

            var creationRequest = new TokenCreationRequest
            {
                Subject = subject,
                ValidatedRequest = request.ValidatedRequest,
                Resources = await Resources.FindEnabledResourcesByScopeAsync(oldAccessToken.Scopes)
            };

            var newAccessToken = await TokenService.CreateAccessTokenAsync(creationRequest);
            accessTokenString = await TokenService.CreateSecurityTokenAsync(newAccessToken);
        }
        else
        {
            oldAccessToken.CreationTime = Clock.UtcNow.UtcDateTime;
            oldAccessToken.Lifetime = request.ValidatedRequest.AccessTokenLifetime;

            accessTokenString = await TokenService.CreateSecurityTokenAsync(oldAccessToken);
        }

        var handle = await RefreshTokenService.UpdateRefreshTokenAsync(request.ValidatedRequest.RefreshTokenHandle, request.ValidatedRequest.RefreshToken, request.ValidatedRequest.Client);

        return new TokenResponse
        {
            IdentityToken = await CreateIdTokenFromRefreshTokenRequestAsync(request.ValidatedRequest, accessTokenString),
            AccessToken = accessTokenString,
            AccessTokenLifetime = request.ValidatedRequest.AccessTokenLifetime,
            RefreshToken = handle,
            Custom = request.CustomResponse,
            Scope = request.ValidatedRequest.RefreshToken.Scopes.ToSpaceSeparatedString()
        };
    }

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