mirror of
https://github.com/alibaba/higress.git
synced 2026-02-28 06:30:49 +08:00
77 lines
2.1 KiB
Go
77 lines
2.1 KiB
Go
// Copyright (c) 2022 Alibaba Group Holding Ltd.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package oc
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import (
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"crypto/hmac"
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"crypto/rand"
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"crypto/sha256"
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"encoding/base64"
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"fmt"
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"golang.org/x/oauth2"
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"strings"
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)
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func Nonce(length int) ([]byte, error) {
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b := make([]byte, length)
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_, err := rand.Read(b)
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return b, err
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}
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func HashNonce(nonce []byte) string {
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hasher := sha256.New()
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hasher.Write(nonce)
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return base64.RawURLEncoding.EncodeToString(hasher.Sum(nil))
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}
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func GenState(nonce []byte, key string, redirectUrl string) string {
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hashedNonce := HashNonce(nonce)
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encodedRedirectUrl := base64.RawURLEncoding.EncodeToString([]byte(redirectUrl))
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state := fmt.Sprintf("%s:%s", hashedNonce, encodedRedirectUrl)
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signature := SignState(state, key)
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return fmt.Sprintf("%s.%s", state, signature)
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}
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func SignState(state string, key string) string {
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mac := hmac.New(sha256.New, []byte(key))
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mac.Write([]byte(state))
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return base64.RawURLEncoding.EncodeToString(mac.Sum(nil))
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}
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func VerifyState(state, signature, key, redirect string) error {
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if !hmac.Equal([]byte(signature), []byte(SignState(state, key))) {
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return fmt.Errorf("signature mismatch")
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}
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parts := strings.Split(state, ":")
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if len(parts) != 2 {
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return fmt.Errorf("invalid state format")
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}
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redirectUrl, err := base64.RawURLEncoding.DecodeString(parts[1])
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if err != nil {
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return fmt.Errorf("failed to decode redirect URL: %v", err)
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}
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if string(redirectUrl) != redirect {
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return fmt.Errorf("redirect URL mismatch")
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}
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return nil
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}
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func SetNonce(nonce string) oauth2.AuthCodeOption {
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return oauth2.SetAuthURLParam("nonce", nonce)
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}
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