getIP.php can now estimate distance between client and server (default enabled, km)

doc.md

@@ -1,7 +1,7 @@
 # HTML5 Speedtest
 
 > by Federico Dossena  
-> Version 4.5.2, February 9, 2018
+> Version 4.5.3, February 23, 2018
 > [https://github.com/adolfintel/speedtest/](https://github.com/adolfintel/speedtest/)
 
 
@@ -217,6 +217,11 @@ w.postMessage('start '+JSON.stringify(params))
     * __Important:__ On Firefox, it is better to run the upload test last
 * __getIp_ispInfo__: if true, the server will try to get ISP info and pass it along with the IP address. This will add `isp=true` to the request to `url_getIp`. getIP.php accomplishes this using ipinfo.io
     * Default: `true`
+* __getIp_ispInfo_distance__: if true, the server will try to get an estimate of the distance from the client to the speedtest server. This will add a `distance` argument to the request to `url_getIp`. `__getIp_ispInfo__` must be enabled in order for this to work. getIP.php accomplishes this using ipinfo.io
+    * `km`: estimate distance in kilometers
+    * `mi`: estimate distance in miles
+    * not set: do not measure distance
+    * Default: `km`
 * __enable_quirks__: enables browser-specific optimizations. These optimizations override some of the default settings. They do not override settings that are explicitly set.
     * Default: `true`
 * __garbagePhp_chunkSize__: size of chunks sent by garbage.php in megabytes

getIP.php

@@ -11,12 +11,58 @@
         $ip=$_SERVER['REMOTE_ADDR'];
     }
     $ip=preg_replace("/^::ffff:/", "", $ip);
-    $isp="";
+	/**
+	 * Optimized algorithm from http://www.codexworld.com
+	 *
+	 * @param float $latitudeFrom
+	 * @param float $longitudeFrom
+	 * @param float $latitudeTo
+	 * @param float $longitudeTo
+	 *
+	 * @return float [km]
+	 */
+	function distance($latitudeFrom, $longitudeFrom, $latitudeTo, $longitudeTo){
+		$rad = M_PI / 180;
+		$theta = $longitudeFrom - $longitudeTo;
+		$dist = sin($latitudeFrom * $rad) * sin($latitudeTo * $rad) +  cos($latitudeFrom * $rad) * cos($latitudeTo * $rad) * cos($theta * $rad);
+		return acos($dist) / $rad * 60 *  1.853;
+	}
     if(isset($_GET["isp"])){
-        $json = file_get_contents("https://ipinfo.io/".$ip."/json");
-        $details = json_decode($json,true);
-        if(array_key_exists("org",$details)) $isp.=$details["org"]; else $isp.="Unknown ISP";
-        if(array_key_exists("country",$details)) $isp.=" (".$details["country"].")";
+		$isp="";
+        try{
+            $json = file_get_contents("https://ipinfo.io/".$ip."/json");
+            $details = json_decode($json,true);
+            if(array_key_exists("org",$details)) $isp.=$details["org"]; else $isp.="Unknown ISP";
+            if(array_key_exists("country",$details)) $isp.=", ".$details["country"];
+            $clientLoc=NULL; $serverLoc=NULL;
+            if(array_key_exists("loc",$details)) $clientLoc=$details["loc"];
+            if(isset($_GET["distance"])){
+                if($clientLoc){
+                    $json = file_get_contents("https://ipinfo.io/json");
+                    $details = json_decode($json,true);
+                    if(array_key_exists("loc",$details)) $serverLoc=$details["loc"];
+                    if($serverLoc){
+                        try{
+                            $clientLoc=explode(",",$clientLoc);
+                            $serverLoc=explode(",",$serverLoc);
+                            $dist=distance($clientLoc[0],$clientLoc[1],$serverLoc[0],$serverLoc[1]);
+                            if($_GET["distance"]=="mi"){
+                                $dist/=1.609344;
+                                $dist=round($dist,-1);
+                                if($dist<15) $dist="<15";
+                                $isp.=" (".$dist." mi)";
+                            }else if($_GET["distance"]=="km"){
+                                $dist=round($dist,-1);
+                                if($dist<20) $dist="<20";
+                                $isp.=" (".$dist." km)";
+                            }
+                        }catch(Exception $e){}
+                    }
+                }
+            }
+        }catch(Exception $ex){
+            $isp="Unknown ISP";
+        }
         echo $ip." - ".$isp;
     } else echo $ip;
 ?>

speedtest_worker.js

@@ -1,5 +1,5 @@
 /*
-	HTML5 Speedtest v4.5.2
+	HTML5 Speedtest v4.5.3
 	by Federico Dossena
 	https://github.com/adolfintel/speedtest/
 	GNU LGPLv3 License
@@ -33,6 +33,7 @@ var settings = {
   url_ping: 'empty.php', // path to an empty file, used for ping test. must be relative to this js file
   url_getIp: 'getIP.php', // path to getIP.php relative to this js file, or a similar thing that outputs the client's ip
   getIp_ispInfo: true, //if set to true, the server will include ISP info with the IP address
+  getIp_ispInfo_distance: 'km', //km or mi=estimate distance from server in km/mi; set to false to disable distance estimation. getIp_ispInfo must be enabled in order for this to work
   xhr_dlMultistream: 10, // number of download streams to use (can be different if enable_quirks is active)
   xhr_ulMultistream: 3, // number of upload streams to use (can be different if enable_quirks is active)
   xhr_multistreamDelay: 300, //how much concurrent requests should be delayed
@@ -168,7 +169,7 @@ function getIp (done) {
 	tlog('getIp failed')
     done()
   }
-  xhr.open('GET', settings.url_getIp + url_sep(settings.url_getIp) + (settings.getIp_ispInfo?"isp=true":"") + 'r=' + Math.random(), true)
+  xhr.open('GET', settings.url_getIp + url_sep(settings.url_getIp) + (settings.getIp_ispInfo?("isp=true"+(settings.getIp_ispInfo_distance?("&distance="+settings.getIp_ispInfo_distance+"&"):"&")):"&") + 'r=' + Math.random(), true)
   xhr.send()
 }
 // download test, calls done function when it's over