lib/server.dart

@@ -4,7 +4,8 @@ enum ServerStatus {
   notOk,
   timeout,
   dnsError,
-  clientConnectivityIssues
+  clientConnectivityIssues,
+  certificateError
 }
 
 class Server {

lib/serverlist.dart

@@ -262,6 +262,26 @@ class _ServerListState extends State<ServerList> {
                   ),
                 ),
               ),
+              IconButton(
+                alignment: Alignment.center,
+                icon: Icon(
+                  Icons.keyboard_arrow_up,
+                  color: Colors.blueGrey,
+                ),
+                onPressed: () {
+                  _moveServerUp(index);
+                },
+              ),
+              IconButton(
+                alignment: Alignment.center,
+                icon: Icon(
+                  Icons.keyboard_arrow_down,
+                  color: Colors.blueGrey,
+                ),
+                onPressed: () {
+                  _moveServerDown(index);
+                },
+              ),
               IconButton(
                 alignment: Alignment.center,
                 icon: Icon(
@@ -375,38 +395,59 @@ class _ServerListState extends State<ServerList> {
   }
 
   static Future<ServerStatus> _checkStatus(String uri) async {
-    Uri parsedUri;
-
     try {
-      parsedUri = Uri.parse(uri);
+      Uri parsedUri;
-    } catch (FormatException) {
-      return ServerStatus.dnsError;
-    }
 
-    try {
-      await HttpUtils.getForFullResponse('https://dns.google.com');
-    } catch (SocketException) {
-      return ServerStatus.clientConnectivityIssues;
-    }
-
-    try {
-      // Check if host is IP address
-      InternetAddress(parsedUri.host);
-    } catch (ArgumentError) /* Host is a DNS name */ {
-      var v4recs, v6recs;
       try {
-        v4recs = await DnsUtils.lookupRecord(parsedUri.host, RRecordType.A);
+        parsedUri = Uri.parse(uri);
-        v6recs = await DnsUtils.lookupRecord(parsedUri.host, RRecordType.AAAA);
+      } on FormatException {
-      } catch (SocketException) {
-        return ServerStatus.clientConnectivityIssues;
-      }
-      var v4 = await _resolveHostname(v4recs, RRecordType.A);
-      var v6 = await _resolveHostname(v6recs, RRecordType.AAAA);
-      if (v4 == null && v6 == null) {
         return ServerStatus.dnsError;
       }
+
+      try {
+        // Check if host is IP address
+        var ip = InternetAddress(parsedUri.host);
+        InternetAddress reversedIp = await ip.reverse();
+        if (ip.host != reversedIp.host) {
+          parsedUri = parsedUri.replace(host: reversedIp.host);
+          throw ArgumentError("Valid IP, but trying with reverse hostname...");
+        }
+        if (parsedUri.scheme == "https") return ServerStatus.certificateError;
+      } on ArgumentError /* Host is a DNS name */ {
+        List<RRecord> v4recs, v6recs;
+        try {
+          try {
+            v4recs = await DnsUtils.lookupRecord(parsedUri.host, RRecordType.A);
+          } on HttpResponseException {
+            v4recs = [];
+          }
+          try {
+            v6recs =
+                await DnsUtils.lookupRecord(parsedUri.host, RRecordType.AAAA);
+          } on HttpResponseException {
+            v6recs = [];
+          }
+        } on SocketException catch (e) {
+          return ServerStatus.clientConnectivityIssues;
+        }
+        var v4 = await _resolveHostname(v4recs, RRecordType.A);
+        var v6 = await _resolveHostname(v6recs, RRecordType.AAAA);
+        if (v4 == null && v6 == null) {
+          return ServerStatus.dnsError;
+        }
+      }
+      try {
+        return await _checkResponse(parsedUri);
+      } on TlsException {
+        return ServerStatus.certificateError;
+      }
+    } on SocketException catch (e) {
+      // Network unreachable
+      if (e.osError.errorCode == 101)
+        return ServerStatus.clientConnectivityIssues;
+
+      throw e;
     }
-    return await _checkResponse(parsedUri);
   }
 
   Icon _generateIcon(Server server) {
@@ -436,6 +477,10 @@ class _ServerListState extends State<ServerList> {
         icon = Icons.signal_wifi_off;
         color = Colors.red.shade400;
         break;
+      case ServerStatus.certificateError:
+        icon = Icons.security;
+        color = Colors.yellow.shade400;
+        break;
       default:
         icon = Icons.device_unknown;
         color = Colors.blueGrey.shade400;
@@ -465,7 +510,7 @@ class _ServerListState extends State<ServerList> {
     try {
       response = await HttpUtils.getForFullResponse(uri.toString())
           .timeout(new Duration(seconds: 3));
-    } catch (TimeoutException) {
+    } on TimeoutException {
       return ServerStatus.timeout;
     }
 
@@ -526,17 +571,48 @@ class _ServerListState extends State<ServerList> {
       case ServerStatus.unknown:
         return 'Loading...';
       case ServerStatus.ok:
-        return 'Reachable';
+        return 'Reachable.';
       case ServerStatus.notOk:
-        return 'Unexpected response';
+        return 'Unexpected response received.';
       case ServerStatus.timeout:
-        return 'Timeout';
+        return 'Server took more than 3 seconds to respond.';
       case ServerStatus.dnsError:
-        return 'DNS issues';
+        return 'DNS issues.';
       case ServerStatus.clientConnectivityIssues:
-        return 'Connectivity issues on your device';
+        return 'Connectivity issues on your device.';
+      case ServerStatus.certificateError:
+        return 'A secure connection could not be established.';
       default:
         return '';
     }
   }
+
+  void _moveServer(int index, AxisDirection direction) {
+    int newIndex;
+    switch (direction) {
+      case AxisDirection.up:
+        if (index == 0) return;
+        newIndex = index - 1;
+        break;
+      case AxisDirection.down:
+        if (index == servers.length - 1) return;
+        newIndex = index + 1;
+        break;
+      default:
+        return;
+        break;
+    }
+
+    Server server = servers[index];
+    servers.removeAt(index);
+    setState(() {
+      servers.insert(newIndex, server);
+      selectedServer = newIndex;
+    });
+    _saveServersToPreferences();
+  }
+
+  void _moveServerUp(int index) => _moveServer(index, AxisDirection.up);
+
+  void _moveServerDown(int index) => _moveServer(index, AxisDirection.down);
 }