Redirecting off-origin navigations in PWAs to CCT.

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappInterceptNavigationDelegate.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappInterceptNavigationDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappInterceptNavigationDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappInterceptNavigationDelegate.java
new file mode 100644
index 0000000000000000000000000000000000000000..9e16699cf98ae00845736c86bb90b01384ff2465
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappInterceptNavigationDelegate.java
@@ -0,0 +1,89 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.webapps;
+
+import android.content.ComponentName;
+import android.net.Uri;
+import android.os.Bundle;
+import android.support.customtabs.CustomTabsCallback;
+import android.support.customtabs.CustomTabsClient;
+import android.support.customtabs.CustomTabsIntent;
+import android.support.customtabs.CustomTabsServiceConnection;
+import android.support.customtabs.CustomTabsSession;
+
+import org.chromium.chrome.browser.UrlConstants;
+import org.chromium.chrome.browser.tab.InterceptNavigationDelegateImpl;
+import org.chromium.chrome.browser.tab.Tab;
+import org.chromium.chrome.browser.util.UrlUtilities;
+import org.chromium.components.navigation_interception.NavigationParams;
+
+import javax.annotation.Nullable;
+
+/**
+ * Intercepts navigations made by the Web App and sends off-origin http(s) ones to a Custom Tab.
+ */
+public class WebappInterceptNavigationDelegate extends InterceptNavigationDelegateImpl {
+    private final WebappActivity mActivity;
+    private CustomTabsClient mClient;
+
+    public WebappInterceptNavigationDelegate(WebappActivity activity, Tab tab) {
+        super(tab);
+        this.mActivity = activity;
+
+        CustomTabsServiceConnection connection = new CustomTabsServiceConnection() {
+            @Override
+            public void onCustomTabsServiceConnected(
+                    ComponentName componentName, CustomTabsClient customTabsClient) {
+                mClient = customTabsClient;
+            }
+
+            @Override
+            public void onServiceDisconnected(ComponentName componentName) {
+                mClient = null;
+            }
+        };
+
+        CustomTabsClient.bindCustomTabsService(mActivity, mActivity.getPackageName(), connection);
+    }
+
+    @Nullable
+    private CustomTabsSession getSession() {
+        if (mClient == null) {
+            return null;
+        }
+        return mClient.newSession(new CustomTabsCallback() {
+            @Override
+            public void onNavigationEvent(int navigationEvent, Bundle extras) {
+                super.onNavigationEvent(navigationEvent, extras);
+            }
+        });
+    }
+
+    @Override
+    public boolean shouldIgnoreNavigation(NavigationParams navigationParams) {
+        if (super.shouldIgnoreNavigation(navigationParams)) {
+            return true;
+        }
+
+        if (isHttpOrHttps(navigationParams.url)
+                && !UrlUtilities.sameDomainOrHost(
+                           mActivity.mWebappInfo.uri().toString(), navigationParams.url, true)) {
+            CustomTabsIntent.Builder intentBuilder = new CustomTabsIntent.Builder(getSession());
+            if (mActivity.mWebappInfo.hasValidThemeColor()) {
+                // Need to cast as themeColor is a long to contain possible error results.
+                intentBuilder.setToolbarColor((int) mActivity.mWebappInfo.themeColor());
+            }
+            intentBuilder.build().launchUrl(mActivity, Uri.parse(navigationParams.url));
+            return true;
+        }
+
+        return false;
+    }
+
+    private static boolean isHttpOrHttps(String url) {
+        return url.startsWith(UrlConstants.HTTP_URL_PREFIX)
+                || url.startsWith(UrlConstants.HTTPS_URL_PREFIX);
+    }
+}