Add SSLSocket ssl_version property like MRI has

Author: driskell

src/main/java/org/jruby/ext/openssl/SSLSocket.java

@@ -858,6 +858,12 @@ public IRubyObject set_session(IRubyObject session) {
         return getRuntime().getNil(); // throw new UnsupportedOperationException();
     }
 
+    @JRubyMethod
+    public IRubyObject ssl_version() {
+        if ( engine == null ) return getRuntime().getNil();
+        return getRuntime().newString( engine.getSession().getProtocol() );
+    }
+
     private SocketChannel getSocketChannel() {
         return (SocketChannel) io.getChannel();
     }

src/test/ruby/ssl/test_ssl.rb

@@ -82,4 +82,30 @@ def test_post_connection_check
     end
   end
 
-end
+  def test_ssl_version_sslv3
+    ctx_proc = Proc.new do |ctx|
+      ctx.ssl_version = "SSLv3"
+    end
+    start_server(PORT, OpenSSL::SSL::VERIFY_NONE, true, :ctx_proc => ctx_proc) do |server, port|
+      sock = TCPSocket.new("127.0.0.1", port)
+      ssl = OpenSSL::SSL::SSLSocket.new(sock)
+      ssl.connect
+      assert_equal("SSLv3", ssl.ssl_version)
+      ssl.close
+    end
+  end
+
+  def test_ssl_version_tlsv1
+    ctx_proc = Proc.new do |ctx|
+      ctx.ssl_version = "TLSv1"
+    end
+    start_server(PORT, OpenSSL::SSL::VERIFY_NONE, true, :ctx_proc => ctx_proc) do |server, port|
+      sock = TCPSocket.new("127.0.0.1", port)
+      ssl = OpenSSL::SSL::SSLSocket.new(sock)
+      ssl.connect
+      assert_equal("TLSv1", ssl.ssl_version)
+      ssl.close
+    end
+  end
+
+end