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auth_session.go
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auth_session.go
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package bertyauth
import (
"crypto/sha256"
"encoding/base64"
"berty.tech/berty/v2/go/internal/cryptoutil"
)
type AuthSession struct {
State string
CodeVerifier string // CodeVerifier base64 encoded random value
BaseURL string
}
func AuthSessionCodeChallenge(codeVerifier string) string {
codeChallengeArr := sha256.Sum256([]byte(codeVerifier))
codeChallenge := make([]byte, sha256.Size)
for i, c := range codeChallengeArr {
codeChallenge[i] = c
}
return base64.RawURLEncoding.EncodeToString(codeChallenge)
}
func AuthSessionCodeVerifierAndChallenge() (string, string, error) {
verifierArr, err := cryptoutil.GenerateNonce()
if err != nil {
return "", "", err
}
codeVerifierBytes := make([]byte, cryptoutil.NonceSize)
for i, c := range verifierArr {
codeVerifierBytes[i] = c
}
verifier := base64.RawURLEncoding.EncodeToString(codeVerifierBytes)
return verifier, AuthSessionCodeChallenge(verifier), nil
}
func NewAuthSession(baseURL string) (*AuthSession, string, error) {
state, err := cryptoutil.GenerateNonce()
if err != nil {
return nil, "", err
}
verifier, challenge, err := AuthSessionCodeVerifierAndChallenge()
if err != nil {
return nil, "", err
}
stateBytes := make([]byte, cryptoutil.NonceSize)
for i, c := range state {
stateBytes[i] = c
}
auth := &AuthSession{
BaseURL: baseURL,
State: base64.RawURLEncoding.EncodeToString(stateBytes),
CodeVerifier: verifier,
}
return auth, challenge, nil
}