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package grpctool
import (
"context"
"github.com/golang-jwt/jwt/v5"
grpc_auth "github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/auth"
"gitlab.com/gitlab-org/cluster-integration/gitlab-agent/v16/internal/tool/logz"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type JWTAuther struct {
jwtIssuer string // may be empty to disable validation
jwtAudience string // may be empty to disable validation
secret []byte
loggerFromContext func(context.Context) *zap.Logger
}
func NewJWTAuther(secret []byte, jwtIssuer, jwtAudience string, loggerFromContext func(context.Context) *zap.Logger) *JWTAuther {
return &JWTAuther{
jwtIssuer: jwtIssuer,
jwtAudience: jwtAudience,
secret: secret,
loggerFromContext: loggerFromContext,
}
}
// UnaryServerInterceptor returns a new unary server interceptors that performs per-request JWT auth.
func (a *JWTAuther) UnaryServerInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
if err := a.doAuth(ctx); err != nil {
return nil, err
}
return handler(ctx, req)
}
// StreamServerInterceptor returns a new stream server interceptors that performs per-request JWT auth.
func (a *JWTAuther) StreamServerInterceptor(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
if err := a.doAuth(stream.Context()); err != nil {
return err
}
return handler(srv, stream)
}
func (a *JWTAuther) doAuth(ctx context.Context) error {
token, err := grpc_auth.AuthFromMD(ctx, "bearer")
if err != nil {
return err // returns gRPC status error
}
_, err = jwt.Parse(token, func(token *jwt.Token) (interface{}, error) {
return a.secret, nil
}, jwt.WithAudience(a.jwtAudience), jwt.WithIssuer(a.jwtIssuer), jwt.WithValidMethods([]string{"HS256", "HS384", "HS512"}))
if err != nil {
a.loggerFromContext(ctx).Debug("JWT validation failed", logz.Error(err))
return status.Error(codes.Unauthenticated, "JWT validation failed")
}
return nil
}
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