Redirecting off-origin navigations in PWAs to CCT.

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

+// 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.net.Uri;
+import android.support.customtabs.CustomTabsIntent;
+
+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;
+
+/**
+ * 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;
+
+    public WebappInterceptNavigationDelegate(WebappActivity activity, Tab tab) {
+        super(tab);
+        this.mActivity = activity;
+    }
+
+    @Override
+    public boolean shouldIgnoreNavigation(NavigationParams navigationParams) {
+        if (super.shouldIgnoreNavigation(navigationParams)) {
+            return true;
+        }
+
+        if (UrlUtilities.isValidForIntentFallbackNavigation(navigationParams.url)
+                && isUrlOutsideWebappScope(mActivity.mWebappInfo, navigationParams.url)) {
+            CustomTabsIntent.Builder intentBuilder = new CustomTabsIntent.Builder();
+            intentBuilder.setShowTitle(true);
+            if (mActivity.mWebappInfo.hasValidThemeColor()) {
+                // Need to cast as themeColor is a long to contain possible error results.
+                intentBuilder.setToolbarColor((int) mActivity.mWebappInfo.themeColor());
+            }
+            CustomTabsIntent customTabIntent = intentBuilder.build();
+            customTabIntent.intent.setPackage(mActivity.getPackageName());
+            customTabIntent.launchUrl(mActivity, Uri.parse(navigationParams.url));
+            return true;
+        }
+
+        return false;
+    }
+
+    // Note that WebApks override this with a rule based on web manifest scope.
+    protected boolean isUrlOutsideWebappScope(WebappInfo info, String url) {
+        return !UrlUtilities.sameDomainOrHost(info.uri().toString(), url, true);
+    }
+}