TehNrd

<apex:page controller="IPLocation" showHeader="true" cache="false">
    <apex:includeScript value="http://maps.google.com/maps/api/js?sensor=true"/>
    <script type="text/javascript">
        window.onload = function(){
            loadMap();
        }
 
        //Javascript function that loads the map. Notice I can simply use the normal Visualforce merge fields for lat and long.
        function loadMap() {
            var latlng = new google.maps.LatLng({!latitude}, {!longitude});
            var myOptions = {
                zoom: 11,
                center: latlng,
                mapTypeId: google.maps.MapTypeId.ROADMAP
            };
            var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
 
            var marker = new google.maps.Marker({
              position: latlng,
              title:"IP Location"
            });
 
            // To add the marker to the map, call setMap();
            marker.setMap(map);  
        }
    </script>
    <span style="font-size: 1.4em">
    <strong>Related Blog Post:</strong> <a href="http://www.tehnrd.com/ip-address-geolocation-with-force-com/">IP Address Geolocation with Force.com</a><br/><br/>
    </span>
 
    <div id="map_canvas" style="height:500px"></div><br/>
 
    <strong>Values returned from web service:</strong>
    <apex:dataTable value="{!dataList}" var="d" width="300px">
        <apex:column headerValue="Name" value="{!d.Name}"/>
        <apex:column headerValue="Value" value="{!d.Site}"/>
    </apex:dataTable><br/>
 
    If there are no values listed above the location was retrieved from the 
    cookie and the web service was never called. To see web service values 
    clear your cookies and reload this page. Make sure to click the refresh button,
    not place cursor in URL and hit enter.<br/><br/>
 
    <strong>XML respons:</strong> <br/><br/>
    {!xmlResponse}
</apex:page>

public class IPLocation {
 
    String IP_LOOKUP_URL = 'http://ipinfodb.com/ip_query.php?&timezone=true&ip=';
    public String latitude {get; set;}
    public String longitude {get; set;}
    public List<Account> dataList {get; set;}
    public String xmlResponse {get; set;}
 
    public IPLocation(){
        findLocation();
    }
 
    public void findLocation(){
        //Get the users IP address
        String ipAddress = ApexPages.currentPage().getHeaders().get('X-Salesforce-SIP');
        Boolean lookupLocation = true;
 
        /*First check to see if user has existing cookie with current IP address. Rather than 
        create 3 seperate cookies for IP, lat, and long I put these all in one cookie comma
        seperated: "245.547.54.45,45.4575,-124.4575" There is probably no advantage, it may 
        even make this more complicated but it at least demos a different way to use cookies*/
 
        //First check to see if cookie exists
        Map<String,Cookie> cookies = ApexPages.currentPage().getCookies();
        if(cookies.size() > 0){
            if(cookies.get('ipLocation') != null){ 
                List<String> cookieValues = cookies.get('ipLocation').getValue().split(',');
                //List will contain [IP Address, Latitude, Longitude]
 
                /*Check to see if user has the same IP address as the cookie. If same there
                is no need to look up the location again*/
                if(ipAddress == cookieValues[0]){
                    latitude = cookieValues[1];
                    longitude = cookieValues[2];
                    lookupLocation = false;
                }
            }
        }
 
        /*If there were no cookies found or the current user's IP address did not match 
        that of the cookie we need to look up location of users IP address */
        if(lookupLocation == true){
            //Build HTTP request
            //Instantiate a new http object
            Http h = new Http();
 
            //Instantiate a new HTTP request, specify the method (GET) as well as the endpoint
            HttpRequest req = new HttpRequest();
            req.setEndpoint(IP_LOOKUP_URL + ipAddress);
            req.setMethod('GET');
 
            /*We are also setting a timeout, if we are doing this callout on page load we don't want 
            this to prevent page from loading if IP server is down*/
            req.setTimeout(3000);
 
            //Send the request / call webservice
            HttpResponse res;
            Boolean calloutSuccess = true;
            try{
                res = h.send(req);
            }catch(Exception e){
                //Ghetto error handling but better than nothing
                calloutSuccess = false;
            }
 
            if(calloutSuccess == true){
                //Inspect the response, use the XmlStreamReader so we don't have to parse response
                xmlResponse = res.getBody();
                XmlStreamReader reader = res.getXmlStreamReader();
                Map<String,String> responseValues = new Map<String,String>();
 
                try{
                    while(reader.hasNext()) {
                        System.debug('Event Type:' + reader.getEventType());
                        if(reader.getEventType() == XmlTag.START_ELEMENT) {
                            String key = reader.getLocalName();
                            reader.next();
                            if(reader.getEventType() == XmlTag.CHARACTERS){
                                responseValues.put(key,reader.getText());
                            }
                        }
                        reader.next();
                    }
                }catch(exception e){
                    system.debug(e.getMessage());
                }
 
                //Set the latitude and longitude   
                latitude = responseValues.get('Latitude');// '47.482877';
                longitude = responseValues.get('Longitude');// '-122.217066';
 
                /*Next we want to create a cookies so we dont have to make unecessary callouts
                in the future*/
 
                List<Cookie> newCookies = new List<Cookie>();
                newCookies.add(new Cookie('ipLocation',ipAddress+','+latitude+','+longitude,null,15552000,false));
                ApexPages.currentPage().setCookies(newCookies);
 
                //Populate dataList, simply to output webservice values on the page
                dataList = new List<Account>();
                for(String s : responseValues.keySet()){
                    Account a = new Account();
                    a.Name = s;
                    a.Site = responseValues.get(s);
                    dataList.add(a);
                }
            }
        }
    }
}