fix #3 enable to set SSLContext as an option

src/main/java/com/github/nkzawa/engineio/client/Socket.java

@@ -10,6 +10,7 @@ import com.github.nkzawa.parseqs.ParseQS;
 import com.github.nkzawa.thread.EventThread;
 import org.json.JSONException;
 
+import javax.net.ssl.SSLContext;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.*;
@@ -117,6 +118,7 @@ public class Socket extends Emitter {
     /*package*/ Transport transport;
     private Future pingTimeoutTimer;
     private Future pingIntervalTimer;
+    private SSLContext sslContext;
 
     private ReadyState readyState;
     private ScheduledExecutorService heartbeatScheduler = Executors.newSingleThreadScheduledExecutor();
@@ -165,6 +167,7 @@ public class Socket extends Emitter {
         }
 
         this.secure = opts.secure;
+        this.sslContext = opts.sslContext;
         this.hostname = opts.hostname != null ? opts.hostname : "localhost";
         this.port = opts.port != 0 ? opts.port : (this.secure ? 443 : 80);
         this.query = opts.query != null ?
@@ -211,6 +214,7 @@ public class Socket extends Emitter {
         }
 
         Transport.Options opts = new Transport.Options();
+        opts.sslContext = this.sslContext;
         opts.hostname = this.hostname;
         opts.port = this.port;
         opts.secure = this.secure;

src/main/java/com/github/nkzawa/engineio/client/Transport.java

@@ -6,6 +6,7 @@ import com.github.nkzawa.engineio.parser.Packet;
 import com.github.nkzawa.engineio.parser.Parser;
 import com.github.nkzawa.thread.EventThread;
 
+import javax.net.ssl.SSLContext;
 import java.util.Map;
 
 public abstract class Transport extends Emitter {
@@ -39,6 +40,7 @@ public abstract class Transport extends Emitter {
     protected String path;
     protected String hostname;
     protected String timestampParam;
+    protected SSLContext sslContext;
     protected Socket socket;
 
     protected ReadyState readyState;
@@ -51,6 +53,7 @@ public abstract class Transport extends Emitter {
         this.query = opts.query;
         this.timestampParam = opts.timestampParam;
         this.timestampRequests = opts.timestampRequests;
+        this.sslContext = opts.sslContext;
         this.socket = opts.socket;
     }
 
@@ -140,6 +143,7 @@ public abstract class Transport extends Emitter {
         public int port;
         public int policyPort;
         public Map<String, String> query;
+        public SSLContext sslContext;
         protected Socket socket;
     }
 }

src/main/java/com/github/nkzawa/engineio/client/transports/PollingXHR.java

@@ -4,6 +4,8 @@ package com.github.nkzawa.engineio.client.transports;
 import com.github.nkzawa.emitter.Emitter;
 import com.github.nkzawa.thread.EventThread;
 
+import javax.net.ssl.HttpsURLConnection;
+import javax.net.ssl.SSLContext;
 import java.io.*;
 import java.net.HttpURLConnection;
 import java.net.URL;
@@ -36,6 +38,7 @@ public class PollingXHR extends Polling {
             opts = new Request.Options();
         }
         opts.uri = this.uri();
+        opts.sslContext = this.sslContext;
 
         Request req = new Request(opts);
 
@@ -141,15 +144,17 @@ public class PollingXHR extends Polling {
 
         private static final ExecutorService xhrService = Executors.newCachedThreadPool();
 
-        String method;
-        String uri;
-        byte[] data;
-        HttpURLConnection xhr;
+        private String method;
+        private String uri;
+        private byte[] data;
+        private SSLContext sslContext;
+        private HttpURLConnection xhr;
 
         public Request(Options opts) {
             this.method = opts.method != null ? opts.method : "GET";
             this.uri = opts.uri;
             this.data = opts.data;
+            this.sslContext = opts.sslContext;
         }
 
         public void create() {
@@ -164,6 +169,10 @@ public class PollingXHR extends Polling {
                 return;
             }
 
+            if (xhr instanceof HttpsURLConnection && this.sslContext != null) {
+                ((HttpsURLConnection)xhr).setSSLSocketFactory(this.sslContext.getSocketFactory());
+            }
+
             Map<String, String> headers = new TreeMap<String, String>(String.CASE_INSENSITIVE_ORDER);
 
             if ("POST".equals(this.method)) {
@@ -293,6 +302,7 @@ public class PollingXHR extends Polling {
             public String uri;
             public String method;
             public byte[] data;
+            public SSLContext sslContext;
         }
     }
 }

src/main/java/com/github/nkzawa/engineio/client/transports/WebSocket.java

@@ -6,6 +6,7 @@ import com.github.nkzawa.engineio.parser.Packet;
 import com.github.nkzawa.engineio.parser.Parser;
 import com.github.nkzawa.parseqs.ParseQS;
 import com.github.nkzawa.thread.EventThread;
+import org.java_websocket.client.DefaultSSLWebSocketClientFactory;
 import org.java_websocket.client.WebSocketClient;
 import org.java_websocket.drafts.Draft_17;
 import org.java_websocket.handshake.ServerHandshake;
@@ -93,6 +94,9 @@ public class WebSocket extends Transport {
                     });
                 }
             };
+            if (this.sslContext != null) {
+                this.ws.setWebSocketFactory(new DefaultSSLWebSocketClientFactory(this.sslContext));
+            }
             this.ws.connect();
         } catch (URISyntaxException e) {
             throw new RuntimeException(e);