/
jwt.go
86 lines (72 loc) · 1.87 KB
/
jwt.go
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package utils
import (
"crypto/x509"
"encoding/pem"
"errors"
jwtware "github.com/gofiber/contrib/jwt"
"github.com/golang-jwt/jwt/v5"
"os"
)
// LoadECDSAKeyFromFile loads an ECDSA private or public key from a file
func LoadECDSAKeyFromFile(filename string, isPrivate bool) (any, error) {
// Read file
pemBytes, err := os.ReadFile(filename)
if err != nil {
return nil, err
}
// Decode PEM
block, _ := pem.Decode(pemBytes)
if block == nil {
return nil, errors.New("error when decoding .pem file")
}
// Parse key
var key any
if isPrivate {
key, err = x509.ParsePKCS8PrivateKey(block.Bytes)
} else {
key, err = x509.ParsePKIXPublicKey(block.Bytes)
}
if err != nil {
return nil, err
}
return key, nil
}
// GetTokenAndKeyFromAlgo returns a token and a key from an algorithm and a secret
func GetTokenAndKeyFromAlgo(algo, secret, keyPath string) (*jwt.Token, interface{}, error) {
// Create token
var token *jwt.Token
var key interface{}
var err error
if algo == "HS512" {
if len(secret) < 8 {
return nil, nil, errors.New("secret must have at least 8 characters")
}
token = jwt.New(jwt.SigningMethodHS512)
key = []byte(secret)
} else if algo == "ES384" {
token = jwt.New(jwt.SigningMethodES384)
key, err = LoadECDSAKeyFromFile(keyPath, true)
if err != nil {
return nil, nil, err
}
} else {
return nil, nil, errors.New("unsupported JWT algo: must be HS512 or ES384")
}
return token, key, nil
}
// GetKeyFromAlgo returns a key from an algorithm and a secret
func GetKeyFromAlgo(algo, secret, keyPath string) (interface{}, error) {
var key interface{}
var err error
if algo == jwtware.HS512 {
key = []byte(secret)
} else if algo == jwtware.ES384 {
key, err = LoadECDSAKeyFromFile(keyPath, false)
if err != nil {
return nil, err
}
} else {
return nil, errors.New("unsupported JWT algo: must be HS512 or ES384")
}
return key, nil
}