warn user before build expires

Closes #4322
// FREEBIE

res/values/strings.xml

@@ -1118,8 +1118,14 @@
     <string name="text_secure_normal__help">Help</string>
 
     <!-- reminder_header -->
-    <string name="reminder_header_expired_build">Your build of Signal has expired!</string>
-    <string name="reminder_header_expired_build_details">Messages will no longer send successfully, please update to the most recent version.</string>
+    <string name="reminder_header_outdated_build">Your version of Signal is outdated</string>
+    <plurals name="reminder_header_outdated_build_details">
+        <item quantity="one">Your version of Signal will expire in 1 day. Tap to update to the most recent version.</item>
+        <item quantity="other">Your version of Signal will expire in %d days. Tap to update to the most recent version.</item>
+    </plurals>
+    <string name="reminder_header_outdated_build_details_today">Your version of Signal will expire today. Tap to update to the most recent version.</string>
+    <string name="reminder_header_expired_build">Your version of Signal has expired!</string>
+    <string name="reminder_header_expired_build_details">Messages will no longer send successfully. Tap to update to the most recent version.</string>
     <string name="reminder_header_expired_build_button">UPDATE</string>
     <string name="reminder_header_sms_default_title">Use as default SMS app</string>
     <string name="reminder_header_sms_default_text">Tap to make Signal your default SMS app.</string>

src/org/thoughtcrime/securesms/ConversationListFragment.java

@@ -54,6 +54,7 @@ import android.view.ViewGroup;
 import org.thoughtcrime.securesms.ConversationListAdapter.ItemClickListener;
 import org.thoughtcrime.securesms.components.reminder.DefaultSmsReminder;
 import org.thoughtcrime.securesms.components.reminder.ExpiredBuildReminder;
+import org.thoughtcrime.securesms.components.reminder.OutdatedBuildReminder;
 import org.thoughtcrime.securesms.components.reminder.PushRegistrationReminder;
 import org.thoughtcrime.securesms.components.reminder.Reminder;
 import org.thoughtcrime.securesms.components.reminder.ReminderView;
@@ -166,8 +167,10 @@ public class ConversationListFragment extends Fragment
     new AsyncTask<Context, Void, Optional<? extends Reminder>>() {
       @Override protected Optional<? extends Reminder> doInBackground(Context... params) {
         final Context context = params[0];
-        if (ExpiredBuildReminder.isEligible(context)) {
+        if (ExpiredBuildReminder.isEligible()) {
           return Optional.of(new ExpiredBuildReminder(context));
+        } else if (OutdatedBuildReminder.isEligible()) {
+          return Optional.of(new OutdatedBuildReminder(context));
         } else if (DefaultSmsReminder.isEligible(context)) {
           return Optional.of(new DefaultSmsReminder(context));
         } else if (Util.isDefaultSmsProvider(context) && SystemSmsImportReminder.isEligible(context)) {

src/org/thoughtcrime/securesms/components/reminder/ExpiredBuildReminder.java

@@ -31,8 +31,8 @@ public class ExpiredBuildReminder extends Reminder {
     return false;
   }
 
-  public static boolean isEligible(Context context) {
-    return !Util.isBuildFresh();
+  public static boolean isEligible() {
+    return Util.getDaysTillBuildExpiry() <= 0;
   }
 
 }

src/org/thoughtcrime/securesms/components/reminder/OutdatedBuildReminder.java

@@ -0,0 +1,45 @@
+package org.thoughtcrime.securesms.components.reminder;
+
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.view.View;
+
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.util.Util;
+
+public class OutdatedBuildReminder extends Reminder {
+
+  public OutdatedBuildReminder(final Context context) {
+    super(context.getString(R.string.reminder_header_outdated_build),
+          getPluralsText(context));
+    setOkListener(new View.OnClickListener() {
+      @Override
+      public void onClick(View v) {
+        try {
+          context.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=" + context.getPackageName())));
+        } catch (android.content.ActivityNotFoundException anfe) {
+          context.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=" + context.getPackageName())));
+        }
+      }
+    });
+  }
+
+  private static CharSequence getPluralsText(final Context context) {
+    int days = Util.getDaysTillBuildExpiry() - 1;
+    if (days == 0) {
+      return context.getString(R.string.reminder_header_outdated_build_details_today);
+    }
+    return context.getResources().getQuantityString(R.plurals.reminder_header_outdated_build_details, days, days);
+  }
+
+  @Override
+  public boolean isDismissable() {
+    return false;
+  }
+
+  public static boolean isEligible() {
+    return Util.getDaysTillBuildExpiry() <= 10;
+  }
+
+}

src/org/thoughtcrime/securesms/jobs/SendJob.java

@@ -34,7 +34,7 @@ public abstract class SendJob extends MasterSecretJob {
 
   @Override
   public final void onRun(MasterSecret masterSecret) throws Exception {
-    if (!Util.isBuildFresh()) {
+    if (Util.getDaysTillBuildExpiry() <= 0) {
       throw new TextSecureExpiredException(String.format("TextSecure expired (build %d, now %d)",
                                                          BuildConfig.BUILD_TIMESTAMP,
                                                          System.currentTimeMillis()));

src/org/thoughtcrime/securesms/util/Util.java

@@ -327,8 +327,9 @@ public class Util {
     }
   }
 
-  public static boolean isBuildFresh() {
-    return BuildConfig.BUILD_TIMESTAMP + TimeUnit.DAYS.toMillis(90) > System.currentTimeMillis();
+  public static int getDaysTillBuildExpiry() {
+    int age = (int)TimeUnit.MILLISECONDS.toDays(System.currentTimeMillis() - BuildConfig.BUILD_TIMESTAMP);
+    return 90 - age;
   }
 
   @TargetApi(VERSION_CODES.LOLLIPOP)