delete linked contacts on turning off contact sync

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/KeychainApplication.java

@@ -118,8 +118,8 @@ public class KeychainApplication extends Application {
     }
 
     /**
-     * @return the OpenKeychain contact/sync account if it exists or was successfully created, null
-     * otherwise
+     * @return the OpenKeychain contact/keyserver sync account if it exists or was successfully
+     * created, null otherwise
      */
     public static @Nullable Account createAccountIfNecessary(Context context) {
         try {

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/ContactSyncAdapterService.java

@@ -18,7 +18,6 @@
 package org.sufficientlysecure.keychain.service;
 
 import android.accounts.Account;
-import android.accounts.AccountManager;
 import android.app.PendingIntent;
 import android.app.Service;
 import android.content.AbstractThreadedSyncAdapter;
@@ -35,6 +34,7 @@ import android.support.v4.app.NotificationCompat;
 import android.support.v4.app.NotificationManagerCompat;
 
 import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.KeychainApplication;
 import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.ui.SettingsActivity;
 import org.sufficientlysecure.keychain.util.ContactHelper;
@@ -151,10 +151,25 @@ public class ContactSyncAdapterService extends Service {
     }
 
     public static void enableContactsSync(Context context) {
-        AccountManager manager = AccountManager.get(context);
-        Account account = manager.getAccountsByType(Constants.ACCOUNT_TYPE)[0];
+        Account account = KeychainApplication.createAccountIfNecessary(context);
+
+        if (account == null) {
+            // nothing we can do
+            return;
+        }
 
         ContentResolver.setIsSyncable(account, ContactsContract.AUTHORITY, 1);
         ContentResolver.setSyncAutomatically(account, ContactsContract.AUTHORITY, true);
     }
+
+    public static void deleteIfSyncDisabled(Context context) {
+        Account account = KeychainApplication.createAccountIfNecessary(context);
+        if (account == null) {
+            return;
+        }
+        // if user has disabled automatic sync, delete linked OpenKeychain contacts
+        if(!ContentResolver.getSyncAutomatically(account, ContactsContract.AUTHORITY)) {
+            new ContactHelper(context).deleteAllContacts();
+        }
+    }
 }

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/SettingsActivity.java

@@ -51,6 +51,8 @@ import android.widget.LinearLayout;
 import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.compatibility.AppCompatPreferenceActivity;
+import org.sufficientlysecure.keychain.service.ContactSyncAdapterService;
+import org.sufficientlysecure.keychain.ui.base.BaseActivity;
 import org.sufficientlysecure.keychain.ui.util.Notify;
 import org.sufficientlysecure.keychain.ui.util.ThemeChanger;
 import org.sufficientlysecure.keychain.util.Log;
@@ -79,6 +81,7 @@ public class SettingsActivity extends AppCompatPreferenceActivity {
     @Override
     protected void onResume() {
         super.onResume();
+        BaseActivity.onResumeChecks(this);
 
         if (mThemeChanger.changeTheme()) {
             Intent intent = getIntent();
@@ -463,6 +466,8 @@ public class SettingsActivity extends AppCompatPreferenceActivity {
                     } else {
                         // disable syncs
                         ContentResolver.setSyncAutomatically(account, authority, false);
+                        // immediately delete any linked contacts
+                        ContactSyncAdapterService.deleteIfSyncDisabled(getActivity());
                         // cancel any ongoing/pending syncs
                         ContentResolver.cancelSync(account, authority);
                         setSummary(syncCheckBox, authority, false);

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/base/BaseActivity.java

@@ -18,6 +18,7 @@
 package org.sufficientlysecure.keychain.ui.base;
 
 import android.app.Activity;
+import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.v7.app.ActionBar;
@@ -30,6 +31,7 @@ import android.view.ViewGroup;
 import android.widget.TextView;
 
 import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.service.ContactSyncAdapterService;
 import org.sufficientlysecure.keychain.service.KeyserverSyncAdapterService;
 import org.sufficientlysecure.keychain.ui.util.ThemeChanger;
 
@@ -52,7 +54,7 @@ public abstract class BaseActivity extends AppCompatActivity {
     @Override
     protected void onResume() {
         super.onResume();
-        KeyserverSyncAdapterService.cancelUpdates(this);
+        onResumeChecks(this);
 
         if (mThemeChanger.changeTheme()) {
             Intent intent = getIntent();
@@ -63,6 +65,12 @@ public abstract class BaseActivity extends AppCompatActivity {
         }
     }
 
+    public static void onResumeChecks(Context context) {
+        KeyserverSyncAdapterService.cancelUpdates(context);
+        // in case user has disabled sync from settings
+        ContactSyncAdapterService.deleteIfSyncDisabled(context);
+    }
+
     protected void initLayout() {
 
     }

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/ContactHelper.java

@@ -465,7 +465,7 @@ public class ContactHelper {
      */
     public void writeKeysToContacts() {
         if (Constants.DEBUG_SYNC_REMOVE_CONTACTS) {
-            debugDeleteRawContacts();
+            deleteAllContacts();
         }
 
         writeKeysToMainProfileContact();
@@ -671,7 +671,7 @@ public class ContactHelper {
      *
      * @return number of rows deleted
      */
-    private int debugDeleteRawContacts() {
+    public int deleteAllContacts() {
         // CALLER_IS_SYNCADAPTER allows us to actually wipe the RawContact from the device, otherwise
         // would be just flagged for deletion
         Uri deleteUri = ContactsContract.RawContacts.CONTENT_URI.buildUpon().