move micro cli and protoc-gen-micro to cmd/

cmd/micro/server/util_jwt.go

@@ -0,0 +1,91 @@
+package server
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/pem"
+	"errors"
+	"os"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+var (
+	jwtPrivateKey *rsa.PrivateKey
+	jwtPublicKey  *rsa.PublicKey
+)
+
+// Load or generate RSA keys for JWT
+func InitJWTKeys(privPath, pubPath string) error {
+	var err error
+	if _, err = os.Stat(privPath); os.IsNotExist(err) {
+		priv, _ := rsa.GenerateKey(rand.Reader, 2048)
+		privBytes := x509.MarshalPKCS1PrivateKey(priv)
+		privPem := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: privBytes})
+		os.WriteFile(privPath, privPem, 0600)
+		pubBytes, _ := x509.MarshalPKIXPublicKey(&priv.PublicKey)
+		pubPem := pem.EncodeToMemory(&pem.Block{Type: "PUBLIC KEY", Bytes: pubBytes})
+		os.WriteFile(pubPath, pubPem, 0644)
+	}
+	privPem, err := os.ReadFile(privPath)
+	if err != nil {
+		return err
+	}
+	block, _ := pem.Decode(privPem)
+	if block == nil {
+		return errors.New("invalid private key PEM")
+	}
+	jwtPrivateKey, err = x509.ParsePKCS1PrivateKey(block.Bytes)
+	if err != nil {
+		return err
+	}
+	pubPem, err := os.ReadFile(pubPath)
+	if err != nil {
+		return err
+	}
+	block, _ = pem.Decode(pubPem)
+	if block == nil {
+		return errors.New("invalid public key PEM")
+	}
+	pub, err := x509.ParsePKIXPublicKey(block.Bytes)
+	if err != nil {
+		return err
+	}
+	var ok bool
+	jwtPublicKey, ok = pub.(*rsa.PublicKey)
+	if !ok {
+		return errors.New("not RSA public key")
+	}
+	return nil
+}
+
+// Generate a JWT for a user
+func GenerateJWT(userID, userType string, scopes []string, expiry time.Duration) (string, error) {
+	claims := jwt.MapClaims{
+		"sub":    userID,
+		"type":   userType,
+		"scopes": scopes,
+		"exp":    time.Now().Add(expiry).Unix(),
+	}
+	token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
+	return token.SignedString(jwtPrivateKey)
+}
+
+// Parse and validate a JWT, returns claims if valid
+func ParseJWT(tokenStr string) (jwt.MapClaims, error) {
+	token, err := jwt.Parse(tokenStr, func(token *jwt.Token) (interface{}, error) {
+		if _, ok := token.Method.(*jwt.SigningMethodRSA); !ok {
+			return nil, errors.New("unexpected signing method")
+		}
+		return jwtPublicKey, nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
+		return claims, nil
+	}
+	return nil, errors.New("invalid token")
+}