add tracing and refactor some api pkgs

internal/api/grpc/server/middleware/auth_interceptor.go

@@ -0,0 +1,36 @@
+package middleware
+
+import (
+	"context"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+
+	"github.com/caos/zitadel/internal/api"
+	"github.com/caos/zitadel/internal/api/auth"
+	grpc_util "github.com/caos/zitadel/internal/api/grpc"
+)
+
+func AuthorizationInterceptor(verifier auth.TokenVerifier, authConfig *auth.Config, authMethods auth.MethodMapping) func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
+	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
+		authOpt, needsToken := authMethods[info.FullMethod]
+		if !needsToken {
+			return handler(ctx, req)
+		}
+
+		authToken := grpc_util.GetAuthorizationHeader(ctx)
+		if authToken == "" {
+			return nil, status.Error(codes.Unauthenticated, "auth header missing")
+		}
+
+		orgID := grpc_util.GetHeader(ctx, api.ZitadelOrgID)
+
+		ctx, err := auth.CheckUserAuthorization(ctx, req, authToken, orgID, verifier, authConfig, authOpt)
+		if err != nil {
+			return nil, err
+		}
+
+		return handler(ctx, req)
+	}
+}