wehub-resource-sync
e071084ebe
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92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
package server
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"errors"
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"os"
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"time"
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"github.com/golang-jwt/jwt/v5"
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)
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var (
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jwtPrivateKey *rsa.PrivateKey
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jwtPublicKey *rsa.PublicKey
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)
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// Load or generate RSA keys for JWT
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func InitJWTKeys(privPath, pubPath string) error {
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var err error
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if _, err = os.Stat(privPath); os.IsNotExist(err) {
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priv, _ := rsa.GenerateKey(rand.Reader, 2048)
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privBytes := x509.MarshalPKCS1PrivateKey(priv)
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privPem := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: privBytes})
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_ = os.WriteFile(privPath, privPem, 0600)
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pubBytes, _ := x509.MarshalPKIXPublicKey(&priv.PublicKey)
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pubPem := pem.EncodeToMemory(&pem.Block{Type: "PUBLIC KEY", Bytes: pubBytes})
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_ = os.WriteFile(pubPath, pubPem, 0644)
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}
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privPem, err := os.ReadFile(privPath)
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if err != nil {
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return err
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}
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block, _ := pem.Decode(privPem)
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if block == nil {
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return errors.New("invalid private key PEM")
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}
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jwtPrivateKey, err = x509.ParsePKCS1PrivateKey(block.Bytes)
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if err != nil {
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return err
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}
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pubPem, err := os.ReadFile(pubPath)
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if err != nil {
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return err
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}
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block, _ = pem.Decode(pubPem)
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if block == nil {
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return errors.New("invalid public key PEM")
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}
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pub, err := x509.ParsePKIXPublicKey(block.Bytes)
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if err != nil {
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return err
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}
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var ok bool
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jwtPublicKey, ok = pub.(*rsa.PublicKey)
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if !ok {
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return errors.New("not RSA public key")
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}
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return nil
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}
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// Generate a JWT for a user
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func GenerateJWT(userID, userType string, scopes []string, expiry time.Duration) (string, error) {
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claims := jwt.MapClaims{
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"sub": userID,
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"type": userType,
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"scopes": scopes,
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"exp": time.Now().Add(expiry).Unix(),
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}
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token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
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return token.SignedString(jwtPrivateKey)
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}
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// Parse and validate a JWT, returns claims if valid
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func ParseJWT(tokenStr string) (jwt.MapClaims, error) {
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token, err := jwt.Parse(tokenStr, func(token *jwt.Token) (interface{}, error) {
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if _, ok := token.Method.(*jwt.SigningMethodRSA); !ok {
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return nil, errors.New("unexpected signing method")
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}
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return jwtPublicKey, nil
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})
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if err != nil {
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return nil, err
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}
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if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
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return claims, nil
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}
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return nil, errors.New("invalid token")
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}
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