Logic for the Data Saver InfoBar Promo

chrome/android/java/src/org/chromium/chrome/browser/infobar/DataReductionPromoInfoBar.java

Index: chrome/android/java/src/org/chromium/chrome/browser/infobar/DataReductionPromoInfoBar.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/infobar/DataReductionPromoInfoBar.java b/chrome/android/java/src/org/chromium/chrome/browser/infobar/DataReductionPromoInfoBar.java
new file mode 100644
index 0000000000000000000000000000000000000000..b31781f5093e4d98bd7acdd4cddd13073566c844
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/infobar/DataReductionPromoInfoBar.java
@@ -0,0 +1,143 @@
+// Copyright 2016 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.infobar;
+
+import android.content.Context;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager.NameNotFoundException;
+
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.UrlConstants;
+import org.chromium.chrome.browser.omaha.VersionNumberGetter;
+import org.chromium.chrome.browser.preferences.PrefServiceBridge;
+import org.chromium.chrome.browser.preferences.datareduction.DataReductionPromoUtils;
+import org.chromium.content_public.browser.WebContents;
+import org.chromium.net.GURLUtils;
+
+import java.net.HttpURLConnection;
+import java.sql.Date;
+import java.util.Calendar;
+import java.util.TimeZone;
+
+/**
+ * Generates an infobar to promote the data reduction proxy. The infobar contains a message and a
+ * button to enable the proxy.
+ */
+public class DataReductionPromoInfoBar {
+    private static final String M48_STABLE_RELEASE_DATE = "2016-01-26";
+    private static final int NO_INSTALL_TIME = 0;
+
+    private static String sTitle;
+    private static String sText;
+    private static String sPrimaryButtonText;
+    private static String sSecondaryButtonText;
+
+    /**
+     * Launch the data reduction infobar Promo, if it needs to be displayed.
+     *
+     * @param context An Android context.
+     * @param webContents The WebContents of the tab on which the infobar should show.
+     * @param url The URL of the page on which the infobar should show.
+     * @param isFragmentNavigation Whether the main frame navigation did not cause changes to the
+     *            document (for example scrolling to a named anchor PopState).
+     * @param statusCode The HTTP status code of the navigation.
+     */
+    public static boolean maybeLaunchPromoInfoBar(Context context,
+            WebContents webContents, String url, boolean isFragmentNavigation,
+            int statusCode) {
+        if (isFragmentNavigation) return false;
+        if (webContents.isIncognito()) return false;
+        if (statusCode != HttpURLConnection.HTTP_OK) return false;
+        if (!DataReductionPromoUtils.canShowPromos()) return false;
+
+        // Don't show the infobar promo if neither the first run experience or second run promo has
+        // been shown.
+        if (!DataReductionPromoUtils.getDisplayedFreOrSecondRunPromo()) return false;
+
+        // Don't show the promo if the user opted out on the first run experience promo.
+        if (DataReductionPromoUtils.getOptedOutOnFrePromo()) return false;
+
+        // Don't show the promo if the user has seen this infobar promo before.
+        if (DataReductionPromoUtils.getDisplayedInfoBarPromo()) return false;
+
+        // Only show the promo on HTTP pages.
+        if (!GURLUtils.getScheme(url).concat("://").equals(UrlConstants.HTTP_SCHEME)) return false;
+
+        int currentMilestone = VersionNumberGetter.getMilestoneFromVersionNumber(
+                PrefServiceBridge.getInstance().getAboutVersionStrings().getApplicationVersion());
+        String freOrSecondRunVersion =
+                DataReductionPromoUtils.getDisplayedFreOrSecondRunPromoVersion();
+
+        Calendar releaseDateOfM48Stable = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
+        releaseDateOfM48Stable.setTime(Date.valueOf(M48_STABLE_RELEASE_DATE));
+        long packageInstallTime = getPackageInstallTime(context);
+
+        // The boolean pref that stores whether user opted out on the first run experience was
+        // added in M51. If the last promo was shown before M51, then |freOrSecondRunVersion| will
+        // be empty. If Chrome was installed after the FRE promo was added in M48 and before M51,
+        // assume the user opted out from the FRE and don't show the infobar.
+        if (freOrSecondRunVersion.isEmpty()
+                && packageInstallTime > releaseDateOfM48Stable.getTimeInMillis()) {
+            return false;
+        }
+
+        // Only show the promo if the current version is at least two milestones after the last
+        // promo was displayed. If the last promo was shown before M51 then |freOrSecondRunVersion|
+        // will be empty and it is safe to show the infobar promo.
+        if (!freOrSecondRunVersion.isEmpty()
+                && currentMilestone < VersionNumberGetter.getMilestoneFromVersionNumber(
+                        freOrSecondRunVersion) + 2) {
+            return false;
+        }
+
+        DataReductionPromoInfoBar.launch(webContents,
+                context.getString(R.string.data_reduction_promo_infobar_title),
+                context.getString(R.string.data_reduction_promo_infobar_text),
+                context.getString(R.string.data_reduction_promo_infobar_button),
+                context.getString(R.string.no_thanks));
+
+        return true;
+    }
+
+    /**
+     * Gets the time at which this app was first installed in milliseconds since January 1, 1970
+     * 00:00:00.0 UTC.
+     *
+     * @param context An Android context.
+     * @return The time at which this app was first installed in milliseconds since the epoch or
+     *         zero if the time cannot be retrieved.
+     */
+    private static long getPackageInstallTime(Context context) {
+        PackageInfo packageInfo;
+        try {
+            packageInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
+        } catch (NameNotFoundException e) {
+            packageInfo = null;
+        }
+        return packageInfo == null ? NO_INSTALL_TIME : packageInfo.firstInstallTime;
+    }
+
+    /**
+     * Launch a data reduction proxy {@link InfoBar} with the specified title and link
+     * text. Clicking the link will open the specified settings page.
+     *
+     * @param webContents The {@link WebContents} in which to open the {@link InfoBar}.
+     * @param title The text to display in the {@link InfoBar}.
+     * @param primaryButtonText The text to display on the primary button.
+     * @param secondaryButtonText The text to display on the secondary button.
+     */
+    private static void launch(WebContents webContents,
+            String title,
+            String text,
+            String primaryButtonText,
+            String secondaryButtonText) {
+        sTitle = title;
+        sText = text;
+        sPrimaryButtonText = primaryButtonText;
+        sSecondaryButtonText = secondaryButtonText;
+        // TODO(megjablon): Show infobar.
+        DataReductionPromoUtils.saveInfoBarPromoDisplayed();
+    }
+}