1 // Copyright 2018 Palantir Technologies, Inc. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package oauth2 16 17 import ( 18 "net/http" 19 ) 20 21 // StateStore generates and verifies the state parameter for OAuth2 flows. 22 type StateStore interface { 23 // GenerateState creates a new state value, storing it in a way that can be 24 // retrieved by VerifyState at a later point. 25 GenerateState(w http.ResponseWriter, r *http.Request) (string, error) 26 27 // VerifyState checks that the state associated with the request matches 28 // the given state. To avoid timing attacks, implementations should use 29 // constant-time comparisons if possible. 30 VerifyState(r *http.Request, state string) (bool, error) 31 } 32 33 const ( 34 insecureState = "insecure-for-testing-only" 35 ) 36 37 type insecureStateStore struct{} 38 39 func (ss insecureStateStore) GenerateState(w http.ResponseWriter, r *http.Request) (string, error) { 40 return insecureState, nil 41 } 42 43 func (ss insecureStateStore) VerifyState(r *http.Request, state string) (bool, error) { 44 return insecureState == state, nil 45 } 46