Request and response filters

Demis Bellot edited this page Mar 22, 2016 · 19 revisions

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A recent addition to ServiceStack is the ability to register custom Request and Response filters. These should be registered in your AppHost.Configure() onload script:

Global Request Filters

The Request Filters are applied before the service gets called and accepts: (IRequest, IResponse, RequestDto) e.g:

//Add a request filter to check if the user has a session initialized
this.GlobalRequestFilters.Add((req, res, requestDto) => {
    var sessionId = req.GetCookieValue("user-session");
    if (sessionId == null)
    {
        res.ReturnAuthRequired();
    }
});

Global Response Filters

The Response Filters are applied after your service is called and accepts: (IRequest, IResponse, ResponseDto) e.g:

//Add a response filter to add a 'Content-Disposition' header so browsers treat it as a native .csv file
this.GlobalResponseFilters.Add((req, res, responseDto) => {
    if (req.ResponseContentType == ContentType.Csv)
    {
        res.AddHeader(HttpHeaders.ContentDisposition,
        string.Format("attachment;filename={0}.csv", req.OperationName));
    }
});

Tip: If you're writing your own response to the response stream inside the response filter, add res.EndRequest(); to signal to ServiceStack not to do anymore processing for this request.

Typed Request Filters

A more typed API to register Global Request and Response filters per Request DTO Type are available under the RegisterTyped* API's in AppHost where you can register both typed Request and Response Filters for HTTP and MQ Services independently:

void RegisterTypedRequestFilter<T>(Action<IRequest, IResponse, T> filterFn);
void RegisterTypedResponseFilter<T>(Action<IRequest, IResponse, T> filterFn);
void RegisterTypedMessageRequestFilter<T>(Action<IRequest, IResponse, T> filterFn);
void RegisterTypedMessageResponseFilter<T>(Action<IRequest, IResponse, T> filterFn);

Here's an example usage that enables more flexibility in multi-tenant solutions by attaching custom data on incoming requests, e.g:

public override void Configure(Container container)
{
    RegisterTypedRequestFilter<Resource>((req, res, dto) =>
    {
        var route = req.GetRoute();
        if (route != null && route.Path == "/tenant/{TenantName}/resource")
        {
            dto.SubResourceName = "CustomResource";
        }
    });
}

Apply custom behavior to multiple DTO's with Interfaces

Typed Filters can also be used to apply custom behavior on Request DTO's sharing a common interface, e.g:

public override void Configure(Container container)
{
    RegisterTypedRequestFilter<IHasSharedProperty>((req, res, dtoInterface) => {
        dtoInterface.SharedProperty = "Is Shared";    
    });
}

Message Queue Endpoints

Non-HTTP requests like Redis MQ are treated as Internal Requests which only execute the alternate GlobalMessageRequestFilters and GlobalMessageResponseFilters and Action Filter attributes.