Avoid requesting ipinfo.io and generating a php error when the connection is from localhost (#135)

getIP.php

@@ -1,68 +1,94 @@
 <?php
-    $ip="";
-    header('Content-Type: text/plain; charset=utf-8');
-    if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
-        $ip=$_SERVER['HTTP_CLIENT_IP'];
-    } elseif (!empty($_SERVER['X-Real-IP'])) {
-        $ip=$_SERVER['X-Real-IP'];
-    } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
-        $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
-    } else {
-        $ip=$_SERVER['REMOTE_ADDR'];
-    }
-    $ip=preg_replace("/^::ffff:/", "", $ip);
-	/**
-	 * 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"])){
-		$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 $e){}
+
+$ip = "";
+header('Content-Type: text/plain; charset=utf-8');
+if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
+    $ip = $_SERVER['HTTP_CLIENT_IP'];
+} elseif (!empty($_SERVER['X-Real-IP'])) {
+    $ip = $_SERVER['X-Real-IP'];
+} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
+    $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
+} else {
+    $ip = $_SERVER['REMOTE_ADDR'];
+}
+
+$ip = preg_replace("/^::ffff:/", "", $ip);
+
+if (strpos($ip, '::1') !== false) {
+    echo $ip . " - localhost ipv6 access";
+    die();
+}
+if (strpos($ip, '127.0.0') !== false) {
+    echo $ip . " - localhost ipv4 access";
+    die();
+}
+
+/**
+ * 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"])) {
+    $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;
+    } catch (Exception $ex) {
+        $isp = "Unknown ISP";
+    }
+    echo $ip . " - " . $isp;
+} else {
+    echo $ip;
+}
 ?>