Implement Orbot proxy support. Fixes https://redmine.stoutner.com/issues/26.

[PrivacyBrowserAndroid.git] / app / src / main / java / com / stoutner / privacybrowser / OrbotProxyHelper.java

diff --git a/app/src/main/java/com/stoutner/privacybrowser/OrbotProxyHelper.java b/app/src/main/java/com/stoutner/privacybrowser/OrbotProxyHelper.java
new file mode 100644 (file)
index 0000000..ec9ad58
--- /dev/null
+++ b/app/src/main/java/com/stoutner/privacybrowser/OrbotProxyHelper.java
@@ -0,0 +1,101 @@
+/**
+ * Copyright 2016 Soren Stoutner <soren@stoutner.com>.
+ *
+ * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
+ *
+ * Privacy Browser is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Privacy Browser is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Privacy Browser.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.stoutner.privacybrowser;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.net.Proxy;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.app.AlertDialog;
+import android.util.ArrayMap;
+import android.util.Log;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+public class OrbotProxyHelper {
+    public static void setProxy(Context privacyBrowserContext, Activity parentActivity, String proxyHost, String proxyPort) {
+        // Set the proxy values
+        System.setProperty("http.proxyHost", proxyHost);
+        System.setProperty("http.proxyPort", proxyPort);
+        System.setProperty("https.proxyHost", proxyHost);
+        System.setProperty("https.proxyPort", proxyPort);
+
+        // Use reflection to apply the new proxy values.
+        try {
+            Class applicationClass = Class.forName("android.app.Application");
+            Field mLoadedApkField = applicationClass.getDeclaredField("mLoadedApk");
+            // `setAccessible(true)` allows us to change the value of `mLoadedApkField`.
+            mLoadedApkField.setAccessible(true);
+            Object mLoadedApkObject = mLoadedApkField.get(privacyBrowserContext);
+
+            Class loadedApkClass = Class.forName("android.app.LoadedApk");
+            Field mReceiversField = loadedApkClass.getDeclaredField("mReceivers");
+            // `setAccessible(true)` allows us to change the value of `mReceiversField`.
+            mReceiversField.setAccessible(true);
+
+            ArrayMap receivers = (ArrayMap) mReceiversField.get(mLoadedApkObject);
+
+            for (Object receiverMap : receivers.values()) {
+                for (Object receiver : ((ArrayMap) receiverMap).keySet()) {
+                    // We have to use `Class<?>`, which is an `unbounded wildcard parameterized type`, instead of `Class`, which is a `raw type`, or `receiveClass.getDeclaredMethod` below will produce an error.
+                    Class<?> receiverClass = receiver.getClass();
+                    if (receiverClass.getName().contains("ProxyChangeListener")) {
+                        Method onReceiveMethod = receiverClass.getDeclaredMethod("onReceive", Context.class, Intent.class);
+                        Intent intent = new Intent(Proxy.PROXY_CHANGE_ACTION);
+                        onReceiveMethod.invoke(receiver, privacyBrowserContext, intent);
+                    }
+                }
+            }
+        } catch (ClassNotFoundException | NoSuchFieldException | IllegalAccessException | NoSuchMethodException | InvocationTargetException exception) {
+            Log.d("enableProxyThroughOrbot", "Exception: " + exception);
+        }
+
+        if (proxyPort.equals("8118")) {  // Orbot proxy was turned on.
+            // Set the `appBar` background to be light blue if Orbot proxy support is enabled.
+            MainWebViewActivity.appBar.setBackgroundDrawable(ContextCompat.getDrawable(privacyBrowserContext, R.color.blue_50));
+
+            try {  // Check to see if Orbot is installed.
+                PackageManager packageManager = privacyBrowserContext.getPackageManager();
+                packageManager.getPackageInfo("org.torproject.android", PackageManager.GET_ACTIVITIES);
+            } catch (PackageManager.NameNotFoundException exception){  // If an exception is thrown, Orbot is not installed.
+                // Build an `AlertDialog`.  `R.style.LightAlertDialog` formats the color of the button text.
+                AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(parentActivity, R.style.LightAlertDialog);
+                dialogBuilder.setMessage(R.string.orbot_proxy_not_installed);
+                dialogBuilder.setPositiveButton(R.string.close, new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        // Do nothing.  The `AlertDialog` will close automatically.
+                    }
+                });
+
+                // Convert `dialogBuilder` to `alertDialog` and display it on the screen.
+                AlertDialog alertDialog = dialogBuilder.create();
+                alertDialog.show();
+            }
+        } else {  // Otherwise set the default grey `appBar` background.
+            MainWebViewActivity.appBar.setBackgroundDrawable(ContextCompat.getDrawable(privacyBrowserContext, R.color.grey_100));
+        }
+    }
+}