How to avoid SlingRepository.loginAdministrative

mailform.jsp

<%@page import="org.apache.sling.api.request.RequestParameterMap, org.apache.sling.jcr.api.SlingRepository, javax.jcr.Node, org.apache.jackrabbit.commons.JcrUtils"%>
<%@include file="/libs/foundation/global.jsp"%>
<%
    // if we have a "to" parameter...
    if (slingRequest.getRequestParameter("to") != null) {
        String TEMP_PATH = "/tmp/mails/";
        SlingRepository repository = sling.getService(SlingRepository.class);
        Session adminSession = repository.loginAdministrative(null);
        RequestParameterMap params = slingRequest.getRequestParameterMap();
        // create a node at TEMP_PATH+"to"...
        Node mailNode = JcrUtils.getOrCreateByPath(
                                   TEMP_PATH + params.getValue("to").getString(),
                                   true,
                                   "nt:unstructured",
                                   "nt:unstructured",
                                   adminSession,
                                   true);
        // and store message properties for later delivery..
    	for (String key : params.keySet()) {
            mailNode.setProperty(key, params.getValue(key).getString());
        }
        adminSession.save();
		// logout admin session for security reasons!
		adminSession.logout();
        %>Thank you for the nice email! :)<%
    } 
	else {
    %>   
    <form method=GET action=/content/geometrixx-consulting/mailform.html>
        Subject: <br><input type=text name=subject><br>
        To: <br><input type=text name=to><br>
        Message: <br>
        <textarea name=message cols=80 rows=25>
        </textarea><br>
        <input type=submit>
    </form>
<% } %>

mailformnew.jsp

<%@page%>
<%@include file="/libs/foundation/global.jsp"%>
<form method=POST action=/content/geometrixx-consulting/mailform.mailpost.html>
    Subject: <br><input type=text name=subject><br>
    To: <br><input type=text name=to><br>
    Message: <br>
    <textarea name=message cols=80 rows=25>
    </textarea><br>
    <input type=submit>
</form>

MailFormProcessor.java

package com.geometrixx.consulting.website.components.mailform;


public interface MailFormProcessor {

    void processMailRequest(String to, String subject, String message) throws Exception;
}

MailFormProcessorImpl.java

package com.geometrixx.consulting.website.components.mailform.impl;

import java.util.HashMap;
import java.util.Map;

import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.api.resource.ResourceResolverFactory;

import com.geometrixx.consulting.website.components.mailform.MailFormProcessor;

@Component
@Service
public class MailFormProcessorImpl implements MailFormProcessor {

    private static final String TEMP_PATH = "/tmp/mails";
    
    @Reference
    private ResourceResolverFactory resolverFactory;
    
    @Override
    public void processMailRequest(String path, String subject, String message) throws Exception {
        Map<String, Object> authenticationInfo = new HashMap<String, Object>();
        ResourceResolver resolver = resolverFactory.getServiceResourceResolver(authenticationInfo);
        try {
            Resource parent = resolver.getResource(TEMP_PATH);
            if (parent == null) {
                throw new RuntimeException("Can't access " + TEMP_PATH);
            }
            Map<String, Object> props = new HashMap<String, Object>();
            props.put("jcr:title", subject);
            props.put("message", message);
            props.put("jcr:primaryType", "nt:unstructured");
            resolver.create(parent, path, props);
            resolver.commit();
        } finally {
            resolver.close();
        }
    }

}

MailFormServlet.java

package com.geometrixx.consulting.website.components.mailform;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;

import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.sling.SlingServlet;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.SlingAllMethodsServlet;

@SlingServlet(resourceTypes = "sling/servlet/default",
              selectors = "mailpost",
              extensions = "html",
              methods = { "POST" })
public class MailFormServlet extends SlingAllMethodsServlet {

    
    @Reference
    private MailFormProcessor mailFormProcessor;
    
    @Override
    protected void doPost(SlingHttpServletRequest request,
            SlingHttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        try {
            // We should verify that this is a valid email address
            String to = request.getParameter("to");
            String subject = request.getParameter("subject");
            String message = request.getParameter("message");
            mailFormProcessor.processMailRequest(to, subject, message);
            out.println("<html><body><p>OK</p></body></html>");
        } catch (Exception e) {
            throw new ServletException(e.getMessage(), e);
        }
    }

}