From 0bc4cf1b5ac15fb89b7bb9bdcf3924791bfc09c0 Mon Sep 17 00:00:00 2001
From: Alan Livio <alan@telemidia.puc-rio.br>
Date: Mon, 8 Mar 2021 17:40:34 -0300
Subject: [PATCH] update dart examples

---
 discover-client.dart                    | 26 ++++++++++++-------
 discover_client_flutter/lib/client.dart | 14 +++++++---
 discover_client_flutter/lib/main.dart   | 34 ++++++++++++++++---------
 3 files changed, 49 insertions(+), 25 deletions(-)

diff --git a/discover-client.dart b/discover-client.dart
index 6b53e8f..c122d0d 100644
--- a/discover-client.dart
+++ b/discover-client.dart
@@ -1,17 +1,25 @@
 import './discover_client_flutter/lib/client.dart';
+import 'dart:io';
 
 void main() {
   Client client = new Client();
   var query = "urn:schemas-sbtvd-org:service:GingaCCWebServices:1";
+  var found = false;
   client.search(query, (data) async {
-    print("-- main(): received headers ... ");
-    print(data);
-    RegExp regExp = new RegExp(r"GingaCC-Server-BaseURL: *(.*)\s", caseSensitive: false);
-    String url;
-    var match = regExp.firstMatch(data);
-    if (match != null) {
-      url = match[1];
-    }
-    print("-- main(): GingaCC-Server-BaseURL ="  + url);
+    if (found) return;
+    found = true;
+    print("-- m-search response headers ... " + data);
+    String locationUrl = new RegExp(r"LOCATION: *(.*)\s", caseSensitive: false)
+        .firstMatch(data)[1];
+    HttpClient client = new HttpClient();
+    client.getUrl(Uri.parse(locationUrl)).then((HttpClientRequest request) {
+      return request.close();
+    }).then((HttpClientResponse response) {
+      print("-- response from " + locationUrl);
+      print("-- GingaCC-Server-BaseURL = " +
+          response.headers["GingaCC-Server-BaseURL"][0]);
+      print("-- GingaCC-Server-SecureBaseURL = " +
+          response.headers["GingaCC-Server-SecureBaseURL"][0]);
+    });
   });
 }
diff --git a/discover_client_flutter/lib/client.dart b/discover_client_flutter/lib/client.dart
index 7415d61..46f7aaf 100644
--- a/discover_client_flutter/lib/client.dart
+++ b/discover_client_flutter/lib/client.dart
@@ -3,6 +3,12 @@ import 'dart:async';
 import 'dart:convert';
 
 class Client {
+  bool _log;
+
+  Client([bool enableLog = false]) {
+    _log = enableLog;
+  }
+
   final InternetAddress _ipv4Multicast = new InternetAddress("239.255.255.250");
   final InternetAddress _ipv6Multicast = new InternetAddress("FF05::C");
   List<RawDatagramSocket> _sockets = <RawDatagramSocket>[];
@@ -18,7 +24,7 @@ class Client {
     _socket.readEventsEnabled = true;
 
     _socket.listen((event) {
-      print("-- createSocket(): received event " + event.toString());
+      if (_log) print("-- createSocket(): received event " + event.toString());
       switch (event) {
         case RawSocketEvent.read:
           var packet = _socket.receive();
@@ -30,7 +36,7 @@ class Client {
           }
 
           var data = utf8.decode(packet.data);
-          print("-- createSocket(): data received");
+          if (_log) print("-- createSocket(): data received");
           fn(data);
           break;
       }
@@ -73,7 +79,7 @@ class Client {
     for (var socket in _sockets) {
       try {
         var res = socket.send(data, _ipv4Multicast, 1900);
-        print("-- request(): sended bytes $res");
+        if (_log) print("-- request(): sended bytes $res");
       } on SocketException {}
     }
   }
@@ -89,4 +95,4 @@ class Client {
       request(query);
     });
   }
-}
\ No newline at end of file
+}
diff --git a/discover_client_flutter/lib/main.dart b/discover_client_flutter/lib/main.dart
index 9c6e2b1..9fd7874 100644
--- a/discover_client_flutter/lib/main.dart
+++ b/discover_client_flutter/lib/main.dart
@@ -10,6 +10,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_spinkit/flutter_spinkit.dart';
 import 'client.dart';
+import 'dart:io';
 
 void main() => runApp(MyApp());
 
@@ -38,7 +39,7 @@ class MyStatefulWidget extends StatefulWidget {
 class _MyStatefulWidgetState extends State<MyStatefulWidget> {
   bool _scanning = false;
   String url = "";
-  Client client = new Client();
+  Client client = new Client(true);
 
   void _stopScan() {
     setState(() {
@@ -53,16 +54,22 @@ class _MyStatefulWidgetState extends State<MyStatefulWidget> {
     });
     var query = "urn:schemas-sbtvd-org:service:GingaCCWebServices:1";
     client.search(query, (data) async {
-      print("-- main(): received headers => ");
-      print(data);
-      RegExp regExp =
-          new RegExp(r"GingaCC-Server-BaseURL: *(.*)\s", caseSensitive: false);
-      var match = regExp.firstMatch(data);
-      if (match != null) {
-        url = match[1];
-      }
-      print("-- main(): GingaCC-Server-BaseURL = " + url);
-      _stopScan();
+      print("-- m-search response headers ... " + data);
+      String locationUrl =
+          new RegExp(r"LOCATION: *(.*)\s", caseSensitive: false)
+              .firstMatch(data)[1];
+      HttpClient client = new HttpClient();
+      client.getUrl(Uri.parse(locationUrl)).then((HttpClientRequest request) {
+        return request.close();
+      }).then((HttpClientResponse response) {
+        print("-- response from " + locationUrl);
+        print("-- GingaCC-Server-BaseURL = " +
+            response.headers["GingaCC-Server-BaseURL"][0]);
+        print("-- GingaCC-Server-SecureBaseURL = " +
+            response.headers["GingaCC-Server-SecureBaseURL"][0]);
+        url = response.headers["GingaCC-Server-BaseURL"][0];
+        _stopScan();
+      });
     });
   }
 
@@ -89,7 +96,10 @@ class _MyStatefulWidgetState extends State<MyStatefulWidget> {
           title: Text('GingaCC-WS Discover'),
         ),
         body: Center(
-          child: Text((url == "" ? "GingaCC-WS not found": "GingaCC-WS found at " + url),
+          child: Text(
+              (url == ""
+                  ? "GingaCC-WS not found"
+                  : "GingaCC-WS found at " + url),
               style:
                   new TextStyle(fontSize: 18.0, fontWeight: FontWeight.bold)),
         ),