Android WebSocket: include cookies with request

Summary:
This commit brings Android in line with iOS WebSockets by sending along cookies from the shared CookieManager. See: https://github.com/facebook/react-native/pull/5630
Closes https://github.com/facebook/react-native/pull/6067

Differential Revision: D3841122

Pulled By: mkonicek

fbshipit-source-id: 6607424feeb31c9da4e370ebe4b33dbbedc0a446

ReactAndroid/src/main/java/com/facebook/react/modules/websocket/WebSocketModule.java

@@ -9,7 +9,9 @@
 
 package com.facebook.react.modules.websocket;
 
+import android.net.Uri;
 import android.util.Base64;
+import android.webkit.CookieManager;
 
 import java.io.IOException;
 import java.lang.IllegalStateException;
@@ -87,6 +89,27 @@ public class WebSocketModule extends ReactContextBaseJavaModule {
         .tag(id)
         .url(url);
 
+    if (url != null) {
+      // Use the shared CookieManager to access the cookies
+      // set by WebViews inside the same app
+      CookieManager cookieManager = CookieManager.getInstance();
+
+      Uri parsedUrl = Uri.parse(url);
+      Uri.Builder builtUrl = parsedUrl.buildUpon();
+
+      // To get HTTPS-only cookies for wss URLs,
+      // replace wss with http in the URL.
+      if (parsedUrl.getScheme().equals("wss")) {
+        builtUrl.scheme("https");
+      }
+
+      String cookie = cookieManager.getCookie(builtUrl.build().toString());
+
+      if (cookie != null) {
+        builder.addHeader("Cookie", cookie);
+      }
+    }
+
     if (headers != null) {
       ReadableMapKeySetIterator iterator = headers.keySetIterator();