mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-01 14:47:38 +00:00
68 lines
2.3 KiB
Go
68 lines
2.3 KiB
Go
// Copyright 2023 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
package oauth2
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"crypto/sha256"
|
|
"encoding/base64"
|
|
"net/url"
|
|
)
|
|
|
|
const (
|
|
codeChallengeKey = "code_challenge"
|
|
codeChallengeMethodKey = "code_challenge_method"
|
|
codeVerifierKey = "code_verifier"
|
|
)
|
|
|
|
// GenerateVerifier generates a PKCE code verifier with 32 octets of randomness.
|
|
// This follows recommendations in RFC 7636.
|
|
//
|
|
// A fresh verifier should be generated for each authorization.
|
|
// S256ChallengeOption(verifier) should then be passed to Config.AuthCodeURL
|
|
// (or Config.DeviceAccess) and VerifierOption(verifier) to Config.Exchange
|
|
// (or Config.DeviceAccessToken).
|
|
func GenerateVerifier() string {
|
|
// "RECOMMENDED that the output of a suitable random number generator be
|
|
// used to create a 32-octet sequence. The octet sequence is then
|
|
// base64url-encoded to produce a 43-octet URL-safe string to use as the
|
|
// code verifier."
|
|
// https://datatracker.ietf.org/doc/html/rfc7636#section-4.1
|
|
data := make([]byte, 32)
|
|
if _, err := rand.Read(data); err != nil {
|
|
panic(err)
|
|
}
|
|
return base64.RawURLEncoding.EncodeToString(data)
|
|
}
|
|
|
|
// VerifierOption returns a PKCE code verifier AuthCodeOption. It should be
|
|
// passed to Config.Exchange or Config.DeviceAccessToken only.
|
|
func VerifierOption(verifier string) AuthCodeOption {
|
|
return setParam{k: codeVerifierKey, v: verifier}
|
|
}
|
|
|
|
// S256ChallengeFromVerifier returns a PKCE code challenge derived from verifier with method S256.
|
|
//
|
|
// Prefer to use S256ChallengeOption where possible.
|
|
func S256ChallengeFromVerifier(verifier string) string {
|
|
sha := sha256.Sum256([]byte(verifier))
|
|
return base64.RawURLEncoding.EncodeToString(sha[:])
|
|
}
|
|
|
|
// S256ChallengeOption derives a PKCE code challenge derived from verifier with
|
|
// method S256. It should be passed to Config.AuthCodeURL or Config.DeviceAccess
|
|
// only.
|
|
func S256ChallengeOption(verifier string) AuthCodeOption {
|
|
return challengeOption{
|
|
challenge_method: "S256",
|
|
challenge: S256ChallengeFromVerifier(verifier),
|
|
}
|
|
}
|
|
|
|
type challengeOption struct{ challenge_method, challenge string }
|
|
|
|
func (p challengeOption) setValue(m url.Values) {
|
|
m.Set(codeChallengeMethodKey, p.challenge_method)
|
|
m.Set(codeChallengeKey, p.challenge)
|
|
}
|