/
id_token.go
120 lines (106 loc) · 2.75 KB
/
id_token.go
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package id_token
import (
"crypto/sha256"
"crypto/sha512"
"encoding/base64"
"errors"
"fmt"
"strings"
"time"
jwt "github.com/golang-jwt/jwt"
)
func Hash(alg string, token string) (string, error) {
if strings.HasSuffix(alg, "256") {
data := sha256.Sum256([]byte(token))
return base64.StdEncoding.EncodeToString(data[:16]), nil
} else if strings.HasSuffix(alg, "384") {
data := sha512.Sum384([]byte(token))
return base64.StdEncoding.EncodeToString(data[:24]), nil
} else if strings.HasSuffix(alg, "512") {
data := sha512.Sum512([]byte(token))
return base64.StdEncoding.EncodeToString(data[:32]), nil
} else {
return "", errors.New("unsupported signature algorithm")
}
}
func Gen(alg string, key interface{}, keyId,
issuer, clientId, subject, nonce string,
expiresIn, authTime int64, now time.Time) (string, error) {
exp := now.Unix() + expiresIn
iat := now.Unix()
return rawGen(alg, key, keyId,
issuer, clientId, subject,
nonce, exp, authTime, iat,
"", "")
}
func GenForImplicit(alg string, key interface{}, keyId,
issuer, clientId, subject, nonce string,
expiresIn, authTime int64, accessToken string, now time.Time) (string, error) {
exp := now.Unix() + expiresIn
iat := now.Unix()
atHash := ""
var err error
if accessToken != "" {
atHash, err = Hash(alg, accessToken)
if err != nil {
return "", err
}
}
return rawGen(alg, key, keyId,
issuer, clientId, subject,
nonce, exp, authTime, iat, atHash, "")
}
func GenForHybrid(alg string, key interface{}, keyId,
issuer, clientId, subject, nonce string,
expiresIn, authTime int64, accessToken, code string, now time.Time) (string, error) {
exp := now.Unix() + expiresIn
iat := now.Unix()
atHash := ""
var err error
if accessToken != "" {
atHash, err = Hash(alg, accessToken)
if err != nil {
return "", err
}
}
cHash, err := Hash(alg, code)
if err != nil {
return "", err
}
return rawGen(alg, key, keyId,
issuer, clientId, subject,
nonce, exp, authTime, iat, atHash, cHash)
}
func rawGen(alg string, key interface{}, keyId,
issuer, clientId, subject, nonce string,
expiredAt, authTime, issuedAt int64, atHash, cHash string) (string, error) {
meth := jwt.GetSigningMethod(alg)
if meth == nil {
return "", fmt.Errorf("unknown jwt signing algorithm: %s", alg)
}
token := jwt.New(meth)
claims := token.Claims.(jwt.MapClaims)
claims["iss"] = issuer
claims["aud"] = clientId
claims["sub"] = subject
claims["exp"] = expiredAt
if nonce != "" {
claims["nonce"] = nonce
}
if issuedAt >= 0 {
claims["iat"] = issuedAt
}
if authTime >= 0 {
claims["auth_time"] = authTime
}
if atHash != "" {
claims["at_hash"] = atHash
}
if cHash != "" {
claims["c_hash"] = cHash
}
if keyId != "" {
token.Header["kid"] = keyId
}
return token.SignedString(key)
}