com.stackframe.sarariman.telephony.twilio.IncomingTwilioSMSHandler.java Source code

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Here is the source code for com.stackframe.sarariman.telephony.twilio.IncomingTwilioSMSHandler.java

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/*
 * Copyright (C) 2013-2014 StackFrame, LLC
 * This code is licensed under GPLv2.
 */
package com.stackframe.sarariman.telephony.twilio;

import com.google.common.collect.Maps;
import com.google.i18n.phonenumbers.NumberParseException;
import com.google.i18n.phonenumbers.PhoneNumberUtil;
import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber;
import com.stackframe.sarariman.Sarariman;
import com.stackframe.sarariman.telephony.SMSEvent;
import com.twilio.sdk.TwilioRestClient;
import com.twilio.sdk.TwilioUtils;
import java.io.IOException;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author mcculley
 */
public class IncomingTwilioSMSHandler extends HttpServlet {

    private TwilioSMSGatewayImpl gateway;

    @Override
    public void init() throws ServletException {
        super.init();
        Sarariman sarariman = (Sarariman) getServletContext().getAttribute("sarariman");
        gateway = (TwilioSMSGatewayImpl) sarariman.getSMSGateway();
    }

    private static Map<String, String> flatten(Map<String, String[]> m) {
        return Maps.asMap(m.keySet(), (k) -> m.get(k)[0]);
    }

    private static Map<String, String> parameters(HttpServletRequest request) {
        return flatten(request.getParameterMap());
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String url = request.getRequestURL().toString();
        String accountSid = request.getParameter("AccountSid");
        TwilioRestClient client = gateway.getRestClient();
        String expectedAccountSid = client.getAccountSid();
        if (!expectedAccountSid.equals(accountSid)) {
            throw new ServletException("account ID does not match");
        }

        TwilioUtils twilioUtils = new TwilioUtils(client.getAccount().getAuthToken(), expectedAccountSid);
        boolean valid = twilioUtils.validateRequest(request.getHeader("x-twilio-signature"), url,
                parameters(request));
        if (!valid) {
            throw new ServletException("signature does not match");
        }

        PhoneNumberUtil phoneNumberUtil = PhoneNumberUtil.getInstance();
        String body = request.getParameter("Body");
        String status = request.getParameter("SmsStatus");
        long now = System.currentTimeMillis();
        try {
            PhoneNumber from = phoneNumberUtil.parse(request.getParameter("From"), "US");
            PhoneNumber to = phoneNumberUtil.parse(request.getParameter("To"), "US");
            SMSEvent e = new SMSEvent(from, to, body, now, status);
            gateway.distribute(e);
        } catch (NumberParseException npe) {
            throw new ServletException(npe);
        }
    }

}