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rainbowhatto.go
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rainbowhatto.go
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package rainbowhatto
import (
"errors"
"fmt"
"github.com/Rayato159/rainbowhatto/src"
"github.com/golang-jwt/jwt/v4"
)
// Sign algorithm
func HMAC() src.SignAlgorithm {
return src.HMAC
}
func RSA() src.SignAlgorithm {
return src.RSA
}
type Config struct {
// The secret that means a file of .pem key or key in dicectly
ExpiresAt int64 // Required
HMAC *HMACConfig
RSA *RSAConfig
Claims any // Optional
}
type RSAConfig struct {
PrivateKey string // Required
PublicKey string // Required
}
type HMACConfig struct {
Secret string // Required
}
type rainbow struct {
// The secret that means a file of .pem key or key in dicectly
src.Token
}
// RSAToken Concrete
type rsaToken struct {
src.Token
}
func newRSAToken(rw rainbow) src.IToken {
return &rsaToken{
Token: src.Token{
SignAlgorithm: rw.Token.GetSignAlgorithm(),
ExpiresAt: rw.Token.GetExpiresAt(),
Key: &src.Key{
PrivateKey: rw.Token.Key.GetPrivateKey(),
},
Claims: rw.Token.GetClaims(),
},
}
}
type hmacToken struct {
src.Token
}
// HMAC Concrete
func newHMACToken(rw rainbow) src.IToken {
return &hmacToken{
Token: src.Token{
SignAlgorithm: rw.Token.GetSignAlgorithm(),
ExpiresAt: rw.Token.GetExpiresAt(),
Key: &src.Key{
CommonKey: rw.Token.Key.GetCommonKey(),
},
Claims: rw.Token.GetClaims(),
},
}
}
type parseToken struct {
src.Token
}
// Factory
func BuildToken(alg src.SignAlgorithm, cfg Config) (src.IToken, error) {
rw := rainbow{
src.Token{
SignAlgorithm: alg,
ExpiresAt: &jwt.NumericDate{},
Claims: &src.NewClaims{},
Key: &src.Key{},
},
}
rw.Token.SetExpiresAt(cfg.ExpiresAt)
rw.Token.SetClaims(cfg.Claims)
switch alg {
case src.HMAC:
// Error catcher
if cfg.HMAC == nil {
return nil, fmt.Errorf("hmac key is nil")
}
if cfg.HMAC.Secret == "" {
return nil, fmt.Errorf("hmac key is missing")
}
// Sign
rw.Token.SetSecret(cfg.HMAC.Secret)
return newHMACToken(rw), nil
case src.RSA:
// Error catcher
if cfg.RSA == nil {
return nil, fmt.Errorf("rsa key is nil")
}
if cfg.RSA.PrivateKey == "" {
return nil, fmt.Errorf("private key is missing")
}
// Sign
rw.Token.SetSecret(cfg.RSA.PrivateKey)
return newRSAToken(rw), nil
default:
return nil, fmt.Errorf("sign token error: unknown sign algorithm")
}
}
func RefreshToken(alg src.SignAlgorithm, token string, cfg Config) (src.IToken, error) {
rw := rainbow{
src.Token{
SignAlgorithm: alg,
ExpiresAt: &jwt.NumericDate{},
Claims: &src.NewClaims{},
Key: &src.Key{},
},
}
switch alg {
case src.HMAC:
// Error catcher
if cfg.HMAC == nil {
return nil, fmt.Errorf("hmac key is nil")
}
if cfg.HMAC.Secret == "" {
return nil, fmt.Errorf("hmac key is missing")
}
// Parse token
claims, err := ReverseHMACToken(token, cfg.HMAC.Secret)
if err != nil {
return nil, err
}
// Set expires
rw.Token.SetRepeatExpiresAt(claims.ExpiresAt.Unix())
// Set secret
rw.Token.SetSecret(cfg.HMAC.Secret)
rw.Token.SetClaims(cfg.Claims)
// Sign a new token
return newHMACToken(rw), nil
case src.RSA:
// Error catcher
if cfg.RSA == nil {
return nil, fmt.Errorf("rsa key is nil")
}
if cfg.RSA.PrivateKey == "" {
return nil, fmt.Errorf("private key is missing")
}
if cfg.RSA.PublicKey == "" {
return nil, fmt.Errorf("public key is missing")
}
// Parse token
claims, err := ReverseRSAToken(token, cfg.RSA.PublicKey)
if err != nil {
return nil, err
}
// Set expires
rw.Token.SetRepeatExpiresAt(claims.ExpiresAt.Unix())
// Set secret
rw.Token.SetSecret(cfg.RSA.PrivateKey)
rw.Token.SetClaims(cfg.Claims)
// Sign a new token
return newRSAToken(rw), nil
default:
return nil, fmt.Errorf("refresh token error: unknown sign algorithm")
}
}
type Claims struct {
*src.NewClaims `json:"claims"`
}
func ReverseHMACToken(token string, secret string) (*Claims, error) {
parsedToken, err := jwt.ParseWithClaims(token, &src.NewClaims{}, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("error, unexpected signing method: %v", token.Header["alg"])
}
return []byte(secret), nil
})
if err != nil {
if errors.Is(err, jwt.ErrTokenMalformed) {
return nil, fmt.Errorf("token format is invalid")
} else if errors.Is(err, jwt.ErrTokenExpired) {
return nil, fmt.Errorf("token had expired")
} else {
return nil, fmt.Errorf("parse token error: %v", err)
}
}
if claims, ok := parsedToken.Claims.(*src.NewClaims); ok && parsedToken.Valid {
return &Claims{claims}, nil
}
return nil, fmt.Errorf("claims type error")
}
func ReverseRSAToken(token string, path string) (*Claims, error) {
type tempKey struct {
src.Key
}
key := new(tempKey)
key.Key.SetPublicKey(path)
parsedToken, err := jwt.ParseWithClaims(token, &src.NewClaims{}, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodRSA); !ok {
return nil, fmt.Errorf("error, unexpected signing method: %v", token.Header["alg"])
}
return key.Key.GetPublicKey(), nil
})
if err != nil {
if errors.Is(err, jwt.ErrTokenMalformed) {
return nil, fmt.Errorf("token format is invalid")
} else if errors.Is(err, jwt.ErrTokenExpired) {
return nil, fmt.Errorf("token had expired")
} else {
return nil, fmt.Errorf("parse token error: %v", err)
}
}
if claims, ok := parsedToken.Claims.(*src.NewClaims); ok && parsedToken.Valid {
return &Claims{claims}, nil
}
return nil, fmt.Errorf("claims type error")
}