/* Copyright (C) 2016-2024 Andreas Shimokawa, Carsten Pfeiffer, Daniele
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Gobbetti, José Rebelo, Taavi Eomäe
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This file is part of Gadgetbridge.
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Gadgetbridge is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Gadgetbridge is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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package nodomain.freeyourgadget.gadgetbridge.util;
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import android.app.Activity;
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import android.content.ComponentName;
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import android.content.Context;
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import android.content.Intent;
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import android.content.MutableContextWrapper;
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import android.content.ServiceConnection;
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import android.content.pm.PackageManager;
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import android.os.Build;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.IBinder;
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import android.os.Looper;
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import android.os.Message;
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import android.os.Messenger;
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import android.os.RemoteException;
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import android.webkit.WebResourceResponse;
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import android.webkit.WebSettings;
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import android.webkit.WebView;
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import androidx.annotation.NonNull;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.ByteArrayInputStream;
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import java.nio.charset.Charset;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.UUID;
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import java.util.concurrent.CountDownLatch;
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import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
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import nodomain.freeyourgadget.gadgetbridge.service.devices.pebble.webview.GBChromeClient;
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import nodomain.freeyourgadget.gadgetbridge.service.devices.pebble.webview.GBWebClient;
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import nodomain.freeyourgadget.gadgetbridge.service.devices.pebble.webview.JSInterface;
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public class WebViewSingleton {
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private static final Logger LOG = LoggerFactory.getLogger(WebViewSingleton.class);
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private static final WebViewSingleton instance = new WebViewSingleton();
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private WebView webView = null;
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private MutableContextWrapper contextWrapper;
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private Looper mainLooper;
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private UUID currentRunningUUID;
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private Messenger internetHelper = null;
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public boolean internetHelperBound;
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private boolean internetHelperInstalled;
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private CountDownLatch latch;
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private WebResourceResponse internetResponse;
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private Messenger internetHelperListener;
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private WebViewSingleton() {
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}
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//Internet helper outgoing connection
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private final ServiceConnection internetHelperConnection = new ServiceConnection() {
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public void onServiceConnected(ComponentName className, IBinder service) {
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LOG.info("internet helper service bound");
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internetHelperBound = true;
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internetHelper = new Messenger(service);
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}
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public void onServiceDisconnected(ComponentName className) {
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LOG.info("internet helper service unbound");
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internetHelper = null;
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internetHelperBound = false;
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}
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};
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public static synchronized void ensureCreated(Activity context) {
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if (instance.webView == null) {
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instance.contextWrapper = new MutableContextWrapper(context);
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instance.mainLooper = context.getMainLooper();
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instance.webView = new WebView(instance.contextWrapper);
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WebView.setWebContentsDebuggingEnabled(true);
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instance.webView.setWillNotDraw(true);
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instance.webView.clearCache(true);
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instance.webView.setWebViewClient(new GBWebClient());
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instance.webView.setWebChromeClient(new GBChromeClient());
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WebSettings webSettings = instance.webView.getSettings();
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//noinspection SetJavaScriptEnabled
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webSettings.setJavaScriptEnabled(true);
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//needed to access the DOM
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webSettings.setDomStorageEnabled(true);
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//needed for localstorage
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webSettings.setDatabaseEnabled(true);
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// #3373 #3424 - Fix configuration for pebble apps
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// TODO: this should use a WebViewAssetLoader
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webSettings.setAllowFileAccess(true);
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}
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}
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public static WebViewSingleton getInstance() {
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return instance;
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}
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public WebResourceResponse send(Message webRequest) throws RemoteException, InterruptedException {
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webRequest.replyTo = internetHelperListener;
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latch = new CountDownLatch(1); //the messenger should run on a single thread, hence we don't need to be worried about concurrency. This approach however is certainly not ideal.
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internetHelper.send(webRequest);
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latch.await();
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return internetResponse;
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}
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//Internet helper inbound (responses) handler
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private class IncomingHandler extends Handler {
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public IncomingHandler(Looper looper) {
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super(looper);
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}
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private String getCharsetFromHeaders(String contentType) {
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if (contentType != null && contentType.toLowerCase().trim().contains("charset=")) {
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String[] parts = contentType.toLowerCase().trim().split("=");
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if (parts.length > 0)
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return parts[1];
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}
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return null;
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}
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@Override
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public void handleMessage(Message msg) {
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Bundle data = msg.getData();
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LOG.debug("WEBVIEW: internet helper returned: " + data.getString("response"));
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Map<String, String> headers = new HashMap<>();
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headers.put("Access-Control-Allow-Origin", "*");
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internetResponse = new WebResourceResponse(data.getString("content-type"), data.getString("content-encoding"), 200, "OK",
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headers,
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new ByteArrayInputStream(data.getString("response").getBytes(Charset.forName(getCharsetFromHeaders(data.getString("content-type")))))
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);
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latch.countDown();
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}
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}
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@NonNull
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public WebView getWebView(Context context) {
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contextWrapper.setBaseContext(context);
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return webView;
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}
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/**
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* Checks that the webview is up and the given app is running.
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* @param uuid the uuid of the application expected to be running
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* @throws IllegalStateException when the webview is not active or the app is not running
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*/
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public void checkAppRunning(@NonNull UUID uuid) {
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if (webView == null) {
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throw new IllegalStateException("instance.webView is null!");
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}
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if (!uuid.equals(currentRunningUUID)) {
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throw new IllegalStateException("Expected app " + uuid + " is not running, but " + currentRunningUUID + " is.");
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}
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}
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public void runJavascriptInterface(@NonNull Activity context, @NonNull GBDevice device, @NonNull UUID uuid) {
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ensureCreated(context);
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runJavascriptInterface(device, uuid);
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}
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public void runJavascriptInterface(@NonNull GBDevice device, @NonNull UUID uuid) {
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if (uuid.equals(currentRunningUUID)) {
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LOG.debug("WEBVIEW uuid not changed keeping the old context");
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} else {
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final JSInterface jsInterface = new JSInterface(device, uuid);
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LOG.debug("WEBVIEW uuid changed, restarting");
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currentRunningUUID = uuid;
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invokeWebview(new WebViewRunnable() {
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@Override
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public void invoke(WebView webView) {
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webView.onResume();
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webView.removeJavascriptInterface("GBjs");
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webView.addJavascriptInterface(jsInterface, "GBjs");
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webView.loadUrl("file:///android_asset/app_config/configure.html?rand=" + Math.random() * 500);
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}
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});
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if (contextWrapper != null && !internetHelperBound && !internetHelperInstalled) {
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String internetHelperPkg = "nodomain.freeyourgadget.internethelper";
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String internetHelperCls = internetHelperPkg + ".MyService";
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try {
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contextWrapper.getPackageManager().getApplicationInfo(internetHelperPkg, 0);
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Intent intent = new Intent();
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intent.setComponent(new ComponentName(internetHelperPkg, internetHelperCls));
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contextWrapper.getApplicationContext().bindService(intent, internetHelperConnection, Context.BIND_AUTO_CREATE);
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Thread thread = new Thread(new Runnable() {
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@Override
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public void run() {
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Looper.prepare();
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internetHelperListener = new Messenger(new IncomingHandler(Looper.myLooper()));
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Looper.loop();
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}
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});
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thread.start();
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internetHelperInstalled = true;
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}
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catch (PackageManager.NameNotFoundException e) {
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internetHelperInstalled = false;
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LOG.info("WEBVIEW: Internet helper not installed, only mimicked HTTP requests will work.");
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}
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}
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}
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}
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public void stopJavascriptInterface() {
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invokeWebview(new WebViewRunnable() {
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@Override
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public void invoke(WebView webView) {
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webView.removeJavascriptInterface("GBjs");
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webView.loadUrl("about:blank");
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}
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});
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}
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public void disposeWebView() {
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if (internetHelperBound) {
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LOG.debug("WEBVIEW: will unbind the internet helper");
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contextWrapper.getApplicationContext().unbindService(internetHelperConnection);
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internetHelperBound = false;
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}
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currentRunningUUID = null;
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invokeWebview(new WebViewRunnable() {
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@Override
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public void invoke(WebView webView) {
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webView.removeJavascriptInterface("GBjs");
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// webView.setWebChromeClient(null);
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// webView.setWebViewClient(null);
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webView.clearHistory();
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webView.clearCache(true);
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webView.loadUrl("about:blank");
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// webView.freeMemory();
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webView.pauseTimers();
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// webView.destroy();
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// webView = null;
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// contextWrapper = null;
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// jsInterface = null;
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}
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});
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}
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public void invokeWebview(final WebViewRunnable runnable) {
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if (webView == null || mainLooper == null) {
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LOG.warn("Webview already disposed, ignoring runnable");
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return;
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}
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new Handler(mainLooper).post(new Runnable() {
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@Override
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public void run() {
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if (webView == null) {
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LOG.warn("Webview already disposed, cannot invoke runnable");
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return;
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}
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runnable.invoke(webView);
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}
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});
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}
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public interface WebViewRunnable {
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/**
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* Called in the main thread with a non-null webView webView
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* @param webView the webview, never null
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*/
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void invoke(WebView webView);
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}
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}
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