Tapestry 5 service/filter to automatically trim all form inputs of leading/trailing whitespace and replace smart quotes with normal quotes.

FormPreProcessorFilter

In your AppModule:

    public static void bind(ServiceBinder binder)
    {
        ...
        binder.bind(FormPreProcessorFilter.class, FormPreProcessorFilterImplementation.class);
        ...
    }

    /**
     * Contributes custom request handlers to the pipeline.
     *
     * @param configuration The ordered request handler configuration.
     * @param formInputTrimmerFilter A custom filter/service to trim leading/trailing whitespace from form inputs.
     */
    public void contributeHttpServletRequestHandler(OrderedConfiguration<HttpServletRequestFilter> configuration,
                                                    @InjectService("FormPreProcessorFilter") HttpServletRequestFilter formPreProcessorFilter)
    {
        configuration.add("FormPreProcessorFilter", formPreProcessorFilter);
    }

FormPreProcessorFilter.java

Put this in your src/main/java/.../services folder:

import org.apache.tapestry5.services.HttpServletRequestFilter;

/**
 * Tapestry HttpServletRequestFilter service designed to be used inside a
 * contributeHttpServletRequestHandler startup contribution:
 *
 * public void contributeHttpServletRequestHandler(OrderedConfiguration<HttpServletRequestFilter> configuration,
 *                                                 @InjectService("FormPreProcessorFilter") HttpServletRequestFilter formPreProcessorFilter)
 * {
 *     configuration.add("FormPreProcessorFilter", formPreProcessorFilter);
 * }
 *
 * This service will then filter all form inputs by trimming leading/trailing
 * spaces and replacing smart quotes.
 */
public interface FormPreProcessorFilter extends HttpServletRequestFilter
{
}

FormPreProcessorFilterImplementation.java

Put this in your src/main/java/.../services folder (or subfolder):

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;

import ....services.FormPreProcessorFilter;

import org.apache.tapestry5.services.HttpServletRequestHandler;

/**
 * Tapestry service to trim leading and trailing spaces from form inputs and
 * also replace smart quotes with normal quotes.
 *
 * See the interface for how to contribute the service as a
 * HttpServletRequestFilter.
 */
public class FormPreProcessorFilterImplementation implements FormPreProcessorFilter
{
    /*
     * Service the HTTP request by passing it through our custom request wrapper.
     *
     * @see org.apache.tapestry5.services.HttpServletRequestFilter#service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, org.apache.tapestry5.services.HttpServletRequestHandler)
     */
    public boolean service(HttpServletRequest request, HttpServletResponse response, HttpServletRequestHandler handler) throws IOException
    {
        return handler.service(new FormPreProcessorRequestWrapper(request), response);
    }

    /**
     * Custom request wrapper which trims all calls to get the parameter value.
     * Java Servlets do not allow you to set the parameter values, so this is
     * the best that can be done.
     */
    static class FormPreProcessorRequestWrapper extends HttpServletRequestWrapper
    {
        public FormPreProcessorRequestWrapper(HttpServletRequest request)
        {
            super(request);
        }

        @Override
        public String getParameter(String parameterName)
        {
            String parameter = super.getParameter(parameterName);

            // Trim the input parameter and then replace smart quotes with
            // normal quotes, per:
            //   http://stackoverflow.com/questions/2826191/converting-ms-word-quotes-and-apostrophes
            if (parameter != null)
            {
                parameter = parameter.trim();
                parameter = parameter.replaceAll("[\\u2018\\u2019]", "'");
                parameter = parameter.replaceAll("[\\u201C\\u201D]", "\"");
            }

            return parameter;
        }

        // TODO: For completeness, add getParameterValues and getParameterMap.
    }
}