Method applyCallbackToRouter

packages/core/router/router-explorer.ts:155–273

(
    router: T,
    routeDefinition: RouteDefinition,
    instanceWrapper: InstanceWrapper,
    moduleKey: string,
    routePathMetadata: RoutePathMetadata,
    host: string | RegExp | Array<string | RegExp>,
  )

  }

  private applyCallbackToRouter<T extends HttpServer>(
    router: T,
    routeDefinition: RouteDefinition,
    instanceWrapper: InstanceWrapper,
    moduleKey: string,
    routePathMetadata: RoutePathMetadata,
    host: string | RegExp | Array<string | RegExp>,
  ) {
    const {
      path: paths,
      requestMethod,
      targetCallback,
      methodName,
    } = routeDefinition;

    const { instance } = instanceWrapper;
    const routerMethodRef = this.routerMethodFactory
      .get(router, requestMethod)
      .bind(router);

    const isRequestScoped = !instanceWrapper.isDependencyTreeStatic();
    const proxy = isRequestScoped
      ? this.createRequestScopedHandler(
          instanceWrapper,
          requestMethod,
          this.container.getModuleByKey(moduleKey)!,
          moduleKey,
          methodName,
        )
      : this.createCallbackProxy(
          instance,
          targetCallback,
          methodName,
          moduleKey,
          requestMethod,
        );

    const isVersioned =
      (routePathMetadata.methodVersion ||
        routePathMetadata.controllerVersion) &&
      routePathMetadata.versioningOptions;
    let routeHandler = this.applyHostFilter(host, proxy);

    paths.forEach(path => {
      if (
        isVersioned &&
        routePathMetadata.versioningOptions!.type !== VersioningType.URI
      ) {
        // All versioning (except for URI Versioning) is done via the "Version Filter"
        routeHandler = this.applyVersionFilter(
          router,
          routePathMetadata,
          routeHandler,
        );
      }

      routePathMetadata.methodPath = path;
      const pathsToRegister = this.routePathFactory.create(