cleanup

apps/auth-service/internal/auth/neon.go

@@ -0,0 +1,79 @@
+package auth
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/MicahParks/keyfunc/v3"
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type NeonVerifier struct {
+	jwks           keyfunc.Keyfunc
+	expectedIssuer string
+	enabled        bool
+	cancel         context.CancelFunc
+}
+
+func NewNeonVerifier(neonAuthURL string) (*NeonVerifier, error) {
+	trimmed := strings.TrimRight(strings.TrimSpace(neonAuthURL), "/")
+	if trimmed == "" {
+		return &NeonVerifier{enabled: false}, nil
+	}
+	parsed, err := url.Parse(trimmed)
+	if err != nil {
+		return nil, fmt.Errorf("parse neon auth url: %w", err)
+	}
+	expectedIssuer := fmt.Sprintf("%s://%s", parsed.Scheme, parsed.Host)
+	jwksURL := fmt.Sprintf("%s/.well-known/jwks.json", trimmed)
+	ctx, cancel := context.WithCancel(context.Background())
+	jwks, err := keyfunc.NewDefaultCtx(ctx, []string{jwksURL})
+	if err != nil {
+		cancel()
+		return nil, fmt.Errorf("create neon jwks: %w", err)
+	}
+	return &NeonVerifier{jwks: jwks, expectedIssuer: expectedIssuer, enabled: true, cancel: cancel}, nil
+}
+
+func (v *NeonVerifier) Enabled() bool {
+	return v != nil && v.enabled
+}
+
+func (v *NeonVerifier) Close() {
+	if v != nil && v.cancel != nil {
+		v.cancel()
+	}
+}
+
+func (v *NeonVerifier) Verify(tokenString string) (*Claims, error) {
+	if !v.Enabled() {
+		return nil, errors.New("neon auth verifier is disabled")
+	}
+	token, err := jwt.Parse(tokenString, v.jwks.Keyfunc,
+		jwt.WithIssuer(v.expectedIssuer),
+		jwt.WithValidMethods([]string{"EdDSA"}),
+		jwt.WithAudience(v.expectedIssuer),
+		jwt.WithLeeway(15*time.Second),
+	)
+	if err != nil {
+		return nil, err
+	}
+	claims, ok := token.Claims.(jwt.MapClaims)
+	if !ok || !token.Valid {
+		return nil, errors.New("invalid neon claims")
+	}
+	subject, _ := claims["sub"].(string)
+	email, _ := claims["email"].(string)
+	name, _ := claims["name"].(string)
+	if name == "" {
+		name, _ = claims["display_name"].(string)
+	}
+	if strings.TrimSpace(subject) == "" {
+		return nil, errors.New("missing neon subject")
+	}
+	return &Claims{UserID: subject, Email: email, Name: name, Role: "authenticated", Type: "access"}, nil
+}