| /* |
| Copyright 2017 The Kubernetes Authors. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| package union |
| |
| import ( |
| "context" |
| |
| utilerrors "k8s.io/apimachinery/pkg/util/errors" |
| "k8s.io/apiserver/pkg/authentication/authenticator" |
| ) |
| |
| // unionAuthTokenHandler authenticates tokens using a chain of authenticator.Token objects |
| type unionAuthTokenHandler struct { |
| // Handlers is a chain of request authenticators to delegate to |
| Handlers []authenticator.Token |
| // FailOnError determines whether an error returns short-circuits the chain |
| FailOnError bool |
| } |
| |
| // New returns a token authenticator that validates credentials using a chain of authenticator.Token objects. |
| // The entire chain is tried until one succeeds. If all fail, an aggregate error is returned. |
| func New(authTokenHandlers ...authenticator.Token) authenticator.Token { |
| if len(authTokenHandlers) == 1 { |
| return authTokenHandlers[0] |
| } |
| return &unionAuthTokenHandler{Handlers: authTokenHandlers, FailOnError: false} |
| } |
| |
| // NewFailOnError returns a token authenticator that validates credentials using a chain of authenticator.Token objects. |
| // The first error short-circuits the chain. |
| func NewFailOnError(authTokenHandlers ...authenticator.Token) authenticator.Token { |
| if len(authTokenHandlers) == 1 { |
| return authTokenHandlers[0] |
| } |
| return &unionAuthTokenHandler{Handlers: authTokenHandlers, FailOnError: true} |
| } |
| |
| // AuthenticateToken authenticates the token using a chain of authenticator.Token objects. |
| func (authHandler *unionAuthTokenHandler) AuthenticateToken(ctx context.Context, token string) (*authenticator.Response, bool, error) { |
| var errlist []error |
| for _, currAuthRequestHandler := range authHandler.Handlers { |
| info, ok, err := currAuthRequestHandler.AuthenticateToken(ctx, token) |
| if err != nil { |
| if authHandler.FailOnError { |
| return info, ok, err |
| } |
| errlist = append(errlist, err) |
| continue |
| } |
| |
| if ok { |
| return info, ok, err |
| } |
| } |
| |
| return nil, false, utilerrors.NewAggregate(errlist) |
| } |