implement preliminary MultiCertifyActivity (most heavy lifting is done)

10 files changed, 822 insertions, 9 deletions

diff --git a/OpenKeychain/src/main/AndroidManifest.xml b/OpenKeychain/src/main/AndroidManifest.xml
index 68153af34..959e1cf08 100644
--- a/OpenKeychain/src/main/AndroidManifest.xml
+++ b/OpenKeychain/src/main/AndroidManifest.xml
@@ -424,6 +424,10 @@
                 android:value=".ui.ViewKeyActivity" />
         </activity>
         <activity
+            android:name=".ui.MultiCertifyKeyActivity"
+            android:configChanges="orientation|screenSize|keyboardHidden|keyboard"
+            android:label="@string/title_certify_key" />
+        <activity
             android:name=".ui.ImportKeysActivity"
             android:configChanges="orientation|screenSize|keyboardHidden|keyboard"
             android:label="@string/title_import_keys"
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/KeychainContract.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/KeychainContract.java
index 33f51cbf9..6127002bb 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/KeychainContract.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/KeychainContract.java
@@ -89,7 +89,6 @@ public class KeychainContract {
             .parse("content://" + CONTENT_AUTHORITY);
 
     public static final String BASE_KEY_RINGS = "key_rings";
-    public static final String BASE_DATA = "data";
 
     public static final String PATH_UNIFIED = "unified";
 
@@ -243,6 +242,10 @@ public class KeychainContract {
         public static final String CONTENT_ITEM_TYPE
                 = "vnd.android.cursor.item/vnd.org.sufficientlysecure.keychain.provider.user_ids";
 
+        public static Uri buildUserIdsUri() {
+            return CONTENT_URI.buildUpon().appendPath(PATH_USER_IDS).build();
+        }
+
         public static Uri buildUserIdsUri(long masterKeyId) {
             return CONTENT_URI.buildUpon().appendPath(Long.toString(masterKeyId)).appendPath(PATH_USER_IDS).build();
         }
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/KeychainProvider.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/KeychainProvider.java
index 80f4610a4..d40287690 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/KeychainProvider.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/KeychainProvider.java
@@ -51,6 +51,7 @@ public class KeychainProvider extends ContentProvider {
     private static final int KEY_RINGS_UNIFIED = 101;
     private static final int KEY_RINGS_PUBLIC = 102;
     private static final int KEY_RINGS_SECRET = 103;
+    private static final int KEY_RINGS_USER_IDS = 104;
 
     private static final int KEY_RING_UNIFIED = 200;
     private static final int KEY_RING_KEYS = 201;
@@ -85,17 +86,22 @@ public class KeychainProvider extends ContentProvider {
          * <pre>
          * key_rings/unified
          * key_rings/public
+         * key_rings/secret
+         * key_rings/user_ids
          * </pre>
          */
         matcher.addURI(authority, KeychainContract.BASE_KEY_RINGS
-                + "/" + KeychainContract.PATH_UNIFIED,
+                        + "/" + KeychainContract.PATH_UNIFIED,
                 KEY_RINGS_UNIFIED);
         matcher.addURI(authority, KeychainContract.BASE_KEY_RINGS
-                + "/" + KeychainContract.PATH_PUBLIC,
+                        + "/" + KeychainContract.PATH_PUBLIC,
                 KEY_RINGS_PUBLIC);
         matcher.addURI(authority, KeychainContract.BASE_KEY_RINGS
-                + "/" + KeychainContract.PATH_SECRET,
+                        + "/" + KeychainContract.PATH_SECRET,
                 KEY_RINGS_SECRET);
+        matcher.addURI(authority, KeychainContract.BASE_KEY_RINGS
+                        + "/" + KeychainContract.PATH_USER_IDS,
+                KEY_RINGS_USER_IDS);
 
         /**
          * find by criteria other than master key id
@@ -450,6 +456,7 @@ public class KeychainProvider extends ContentProvider {
                 break;
             }
 
+            case KEY_RINGS_USER_IDS:
             case KEY_RING_USER_IDS: {
                 HashMap<String, String> projectionMap = new HashMap<String, String>();
                 projectionMap.put(UserIds._ID, Tables.USER_IDS + ".oid AS _id");
@@ -470,13 +477,18 @@ public class KeychainProvider extends ContentProvider {
                                 + Tables.CERTS + "." + Certs.RANK
                             + " AND " + Tables.CERTS + "." + Certs.VERIFIED + " > 0"
                         + ")");
-                groupBy = Tables.USER_IDS + "." + UserIds.RANK;
+                groupBy = Tables.USER_IDS + "." + UserIds.MASTER_KEY_ID
+                        + ", " + Tables.USER_IDS + "." + UserIds.RANK;
 
-                qb.appendWhere(Tables.USER_IDS + "." + UserIds.MASTER_KEY_ID + " = ");
-                qb.appendWhereEscapeString(uri.getPathSegments().get(1));
+                // If we are searching for a particular keyring's ids, add where
+                if (match == KEY_RING_USER_IDS) {
+                    qb.appendWhere(Tables.USER_IDS + "." + UserIds.MASTER_KEY_ID + " = ");
+                    qb.appendWhereEscapeString(uri.getPathSegments().get(1));
+                }
 
                 if (TextUtils.isEmpty(sortOrder)) {
-                    sortOrder = Tables.USER_IDS + "." + UserIds.RANK + " ASC";
+                    sortOrder = Tables.USER_IDS + "." + UserIds.MASTER_KEY_ID + " ASC"
+                            + "," + Tables.USER_IDS + "." + UserIds.RANK + " ASC";
                 }
 
                 break;
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/MultiCertifyKeyActivity.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/MultiCertifyKeyActivity.java
new file mode 100644
index 000000000..6b882f7ce
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/MultiCertifyKeyActivity.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 Vincent Breitmoser <v.breitmoser@mugenguild.com>
+ * Copyright (C) 2011 Senecaso
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.sufficientlysecure.keychain.ui;
+
+import android.os.Bundle;
+import android.support.v7.app.ActionBarActivity;
+
+import org.sufficientlysecure.keychain.R;
+
+/**
+ * Signs the specified public key with the specified secret master key
+ */
+public class MultiCertifyKeyActivity extends ActionBarActivity {
+
+    public static final String EXTRA_KEY_IDS = "extra_key_ids";
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        setContentView(R.layout.multi_certify_key_activity);
+    }
+
+}
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/MultiCertifyKeyFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/MultiCertifyKeyFragment.java
new file mode 100644
index 000000000..03cd6c431
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/MultiCertifyKeyFragment.java
@@ -0,0 +1,398 @@
+/*
+ * Copyright (C) 2013-2014 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 Vincent Breitmoser <v.breitmoser@mugenguild.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.ui;
+
+import android.app.Activity;
+import android.app.ProgressDialog;
+import android.content.Intent;
+import android.database.Cursor;
+import android.database.MatrixCursor;
+import android.graphics.PorterDuff;
+import android.net.Uri;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
+import android.os.Messenger;
+import android.os.Parcel;
+import android.support.v4.app.FragmentActivity;
+import android.support.v4.app.LoaderManager;
+import android.support.v4.app.NavUtils;
+import android.support.v4.content.CursorLoader;
+import android.support.v4.content.Loader;
+import android.view.LayoutInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
+import android.widget.CheckBox;
+import android.widget.CompoundButton;
+import android.widget.CompoundButton.OnCheckedChangeListener;
+import android.widget.ImageView;
+import android.widget.ListView;
+import android.widget.ScrollView;
+import android.widget.Spinner;
+import android.widget.TextView;
+
+import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.pgp.KeyRing;
+import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings;
+import org.sufficientlysecure.keychain.provider.KeychainContract.UserIds;
+import org.sufficientlysecure.keychain.provider.KeychainDatabase.Tables;
+import org.sufficientlysecure.keychain.service.CertifyActionsParcel;
+import org.sufficientlysecure.keychain.service.CertifyActionsParcel.CertifyAction;
+import org.sufficientlysecure.keychain.service.KeychainIntentService;
+import org.sufficientlysecure.keychain.service.KeychainIntentServiceHandler;
+import org.sufficientlysecure.keychain.service.PassphraseCacheService;
+import org.sufficientlysecure.keychain.service.results.CertifyResult;
+import org.sufficientlysecure.keychain.service.results.OperationResult.LogType;
+import org.sufficientlysecure.keychain.service.results.SingletonResult;
+import org.sufficientlysecure.keychain.ui.adapter.MultiUserIdsAdapter;
+import org.sufficientlysecure.keychain.ui.adapter.UserIdsAdapter;
+import org.sufficientlysecure.keychain.ui.dialog.PassphraseDialogFragment;
+import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
+import org.sufficientlysecure.keychain.ui.util.Notify;
+import org.sufficientlysecure.keychain.ui.widget.CertifyKeySpinner;
+import org.sufficientlysecure.keychain.ui.widget.KeySpinner;
+import org.sufficientlysecure.keychain.util.Log;
+import org.sufficientlysecure.keychain.util.Preferences;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+public class MultiCertifyKeyFragment extends LoaderFragment
+        implements LoaderManager.LoaderCallbacks<Cursor> {
+
+    private FragmentActivity mActivity;
+
+    private CheckBox mUploadKeyCheckbox;
+    private ScrollView mScrollView;
+    ListView mUserIds;
+
+    private CertifyKeySpinner mCertifyKeySpinner;
+
+    private long[] mPubMasterKeyIds;
+
+    private long mSignMasterKeyId = Constants.key.none;
+
+    public static final String[] USER_IDS_PROJECTION = new String[]{
+            UserIds._ID,
+            UserIds.MASTER_KEY_ID,
+            UserIds.USER_ID,
+            UserIds.IS_PRIMARY,
+            UserIds.IS_REVOKED
+    };
+    private static final int INDEX_MASTER_KEY_ID = 1;
+    private static final int INDEX_USER_ID = 2;
+    private static final int INDEX_IS_PRIMARY = 3;
+    private static final int INDEX_IS_REVOKED = 4;
+
+    private MultiUserIdsAdapter mUserIdsAdapter;
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+
+        // Start out with a progress indicator.
+        setContentShown(false);
+
+        mPubMasterKeyIds = mActivity.getIntent().getLongArrayExtra(MultiCertifyKeyActivity.EXTRA_KEY_IDS);
+        if (mPubMasterKeyIds == null) {
+            Log.e(Constants.TAG, "List of key ids to certify missing!");
+            mActivity.finish();
+            return;
+        }
+
+        mUserIdsAdapter = new MultiUserIdsAdapter(mActivity, null, 0);
+        mUserIds.setAdapter(mUserIdsAdapter);
+
+        getLoaderManager().initLoader(0, null, this);
+
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup superContainer, Bundle savedInstanceState) {
+        View root = super.onCreateView(inflater, superContainer, savedInstanceState);
+
+        // is this "the android way"?
+        mActivity = getActivity();
+
+        View view = inflater.inflate(R.layout.multi_certify_key_fragment, getContainer());
+
+        mCertifyKeySpinner = (CertifyKeySpinner) view.findViewById(R.id.certify_key_spinner);
+        mUploadKeyCheckbox = (CheckBox) view.findViewById(R.id.sign_key_upload_checkbox);
+        mScrollView = (ScrollView) view.findViewById(R.id.certify_scroll_view);
+        mUserIds = (ListView) view.findViewById(R.id.view_key_user_ids);
+
+        // make certify image gray, like action icons
+        ImageView vActionCertifyImage =
+                (ImageView) view.findViewById(R.id.certify_key_action_certify_image);
+        vActionCertifyImage.setColorFilter(getResources().getColor(R.color.tertiary_text_light),
+                PorterDuff.Mode.SRC_IN);
+
+        mCertifyKeySpinner.setOnKeyChangedListener(new KeySpinner.OnKeyChangedListener() {
+            @Override
+            public void onKeyChanged(long masterKeyId) {
+                mSignMasterKeyId = masterKeyId;
+            }
+        });
+
+        View vCertifyButton = view.findViewById(R.id.certify_key_certify_button);
+        vCertifyButton.setOnClickListener(new OnClickListener() {
+
+            @Override
+            public void onClick(View v) {
+                if (mSignMasterKeyId == Constants.key.none) {
+                    Notify.showNotify(mActivity, getString(R.string.select_key_to_certify),
+                            Notify.Style.ERROR);
+                    scrollUp();
+                } else {
+                    initiateCertifying();
+                }
+            }
+        });
+
+        return root;
+    }
+
+    private void scrollUp() {
+        mScrollView.post(new Runnable() {
+            public void run() {
+                mScrollView.fullScroll(ScrollView.FOCUS_UP);
+            }
+        });
+    }
+
+    @Override
+    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
+        Uri uri = UserIds.buildUserIdsUri();
+
+        String selection, ids[];
+        {
+            // generate placeholders and string selection args
+            ids = new String[mPubMasterKeyIds.length];
+            StringBuilder placeholders = new StringBuilder("?");
+            for (int i = 0; i < mPubMasterKeyIds.length; i++) {
+                ids[i] = Long.toString(mPubMasterKeyIds[i]);
+                if (i != 0) {
+                    placeholders.append(",?");
+                }
+            }
+            // put together selection string
+            selection = UserIds.IS_REVOKED + " = 0" + " AND "
+                    + Tables.USER_IDS + "." + UserIds.MASTER_KEY_ID
+                    + " IN (" + placeholders + ")";
+        }
+
+        return new CursorLoader(mActivity, uri,
+                USER_IDS_PROJECTION, selection, ids,
+                Tables.USER_IDS + "." + UserIds.MASTER_KEY_ID + " ASC"
+                        + "," + Tables.USER_IDS + "." + UserIds.USER_ID + " ASC");
+    }
+
+    @Override
+    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
+
+        MatrixCursor matrix = new MatrixCursor(new String[] {
+            "_id", "user_data", "grouped"
+        });
+        data.moveToFirst();
+
+        long lastMasterKeyId = 0;
+        String lastName = "";
+        ArrayList<String> uids = new ArrayList<String>();
+
+        boolean header = true;
+
+        // Iterate over all rows
+        while (!data.isAfterLast()) {
+            long masterKeyId = data.getLong(INDEX_MASTER_KEY_ID);
+            String userId = data.getString(INDEX_USER_ID);
+            String[] pieces = KeyRing.splitUserId(userId);
+
+            // Two cases:
+
+            boolean grouped = masterKeyId == lastMasterKeyId;
+            boolean subGrouped = data.isFirst() || grouped && lastName.equals(pieces[0]);
+            // Remember for next loop
+            lastName = pieces[0];
+
+            Log.d(Constants.TAG, Long.toString(masterKeyId, 16) + (grouped ? "grouped" : "not grouped"));
+
+            if (!subGrouped) {
+                // 1. This name should NOT be grouped with the previous, so we flush the buffer
+
+                /*/ Special case: only a single user id (first && last)
+                if (data.isFirst()) {
+                    lastMasterKeyId = masterKeyId;
+                    uids.add(userId);
+                }*/
+
+                Parcel p = Parcel.obtain();
+                p.writeStringList(uids);
+                byte[] d = p.marshall();
+                p.recycle();
+
+                matrix.addRow(new Object[] {
+                        lastMasterKeyId, d, header ? 1 : 0
+                });
+                // indicate that we have a header for this masterKeyId
+                header = false;
+
+                // Now clear the buffer, and add the new user id, for the next round
+                uids.clear();
+
+            }
+
+            // 2. This name should be grouped with the previous, just add to buffer
+            uids.add(userId);
+            lastMasterKeyId = masterKeyId;
+
+            // If this one wasn't grouped, the next one's gotta be a header
+            if (!grouped) {
+                header = true;
+            }
+
+            // Regardless of the outcome, move to next entry
+            data.moveToNext();
+
+        }
+
+        // If there is anything left in the buffer, flush it one last time
+        if (!uids.isEmpty()) {
+
+            Parcel p = Parcel.obtain();
+            p.writeStringList(uids);
+            byte[] d = p.marshall();
+            p.recycle();
+
+            matrix.addRow(new Object[]{
+                    lastMasterKeyId, d, header ? 1 : 0
+            });
+
+        }
+
+        mUserIdsAdapter.swapCursor(matrix);
+        setContentShown(true, isResumed());
+    }
+
+    @Override
+    public void onLoaderReset(Loader<Cursor> loader) {
+        mUserIdsAdapter.swapCursor(null);
+    }
+
+    /**
+     * handles the UI bits of the signing process on the UI thread
+     */
+    private void initiateCertifying() {
+        // get the user's passphrase for this key (if required)
+        String passphrase;
+        try {
+            passphrase = PassphraseCacheService.getCachedPassphrase(mActivity, mSignMasterKeyId, mSignMasterKeyId);
+        } catch (PassphraseCacheService.KeyNotFoundException e) {
+            Log.e(Constants.TAG, "Key not found!", e);
+            mActivity.finish();
+            return;
+        }
+        if (passphrase == null) {
+            PassphraseDialogFragment.show(mActivity, mSignMasterKeyId,
+                    new Handler() {
+                        @Override
+                        public void handleMessage(Message message) {
+                            if (message.what == PassphraseDialogFragment.MESSAGE_OKAY) {
+                                startCertifying();
+                            }
+                        }
+                    }
+            );
+            // bail out; need to wait until the user has entered the passphrase before trying again
+        } else {
+            startCertifying();
+        }
+    }
+
+    /**
+     * kicks off the actual signing process on a background thread
+     */
+    private void startCertifying() {
+        // Bail out if there is not at least one user id selected
+        ArrayList<String> userIds = mUserIdsAdapter.getSelectedUserIds();
+        if (userIds.isEmpty()) {
+            Notify.showNotify(mActivity, "No identities selected!",
+                    Notify.Style.ERROR);
+            return;
+        }
+
+        // Send all information needed to service to sign key in other thread
+        Intent intent = new Intent(mActivity, KeychainIntentService.class);
+
+        intent.setAction(KeychainIntentService.ACTION_CERTIFY_KEYRING);
+
+        // fill values for this action
+        CertifyActionsParcel parcel = new CertifyActionsParcel(mSignMasterKeyId);
+
+        for (long keyId : mPubMasterKeyIds) {
+            parcel.add(new CertifyAction(keyId, null));
+        }
+
+        Bundle data = new Bundle();
+        data.putParcelable(KeychainIntentService.CERTIFY_PARCEL, parcel);
+        intent.putExtra(KeychainIntentService.EXTRA_DATA, data);
+
+        // Message is received after signing is done in KeychainIntentService
+        KeychainIntentServiceHandler saveHandler = new KeychainIntentServiceHandler(mActivity,
+                getString(R.string.progress_certifying), ProgressDialog.STYLE_SPINNER, true) {
+            public void handleMessage(Message message) {
+                // handle messages by standard KeychainIntentServiceHandler first
+                super.handleMessage(message);
+
+                if (message.arg1 == KeychainIntentServiceHandler.MESSAGE_OKAY) {
+
+                    Bundle data = message.getData();
+                    CertifyResult result = data.getParcelable(CertifyResult.EXTRA_RESULT);
+
+                    Intent intent = new Intent();
+                    intent.putExtra(CertifyResult.EXTRA_RESULT, result);
+                    mActivity.setResult(CertifyKeyActivity.RESULT_OK, intent);
+
+                    // check if we need to send the key to the server or not
+                    if (mUploadKeyCheckbox.isChecked()) {
+                        // upload the newly signed key to the keyserver
+                        // TODO implement
+                        // uploadKey();
+                    } else {
+                        mActivity.finish();
+                    }
+                }
+            }
+        };
+
+        // Create a new Messenger for the communication back
+        Messenger messenger = new Messenger(saveHandler);
+        intent.putExtra(KeychainIntentService.EXTRA_MESSENGER, messenger);
+
+        // show progress dialog
+        saveHandler.showProgressDialog(mActivity);
+
+        // start service with intent
+        mActivity.startService(intent);
+    }
+
+}
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/adapter/MultiUserIdsAdapter.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/adapter/MultiUserIdsAdapter.java
new file mode 100644
index 000000000..2e1752dce
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/adapter/MultiUserIdsAdapter.java
@@ -0,0 +1,161 @@
+/*
+ * Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.ui.adapter;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.os.Parcel;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.CheckBox;
+import android.widget.CompoundButton;
+import android.support.v4.widget.CursorAdapter;
+import android.widget.TextView;
+
+import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.pgp.KeyRing;
+import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
+import org.sufficientlysecure.keychain.util.Log;
+
+import java.util.ArrayList;
+
+public class MultiUserIdsAdapter extends CursorAdapter {
+    private LayoutInflater mInflater;
+    private final ArrayList<Boolean> mCheckStates;
+
+    public MultiUserIdsAdapter(Context context, Cursor c, int flags) {
+        super(context, c, flags);
+        mInflater = LayoutInflater.from(context);
+        mCheckStates = new ArrayList<Boolean>();
+    }
+
+    @Override
+    public Cursor swapCursor(Cursor newCursor) {
+        mCheckStates.clear();
+        if (newCursor != null) {
+            int count = newCursor.getCount();
+            mCheckStates.ensureCapacity(count);
+            // initialize to true (use case knowledge: we usually want to sign all uids)
+            for (int i = 0; i < count; i++) {
+                mCheckStates.add(true);
+            }
+        }
+
+        return super.swapCursor(newCursor);
+    }
+
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        return mInflater.inflate(R.layout.certify_key_item, null);
+    }
+
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {
+        View vHeader = view.findViewById(R.id.user_id_header);
+        TextView vHeaderId = (TextView) view.findViewById(R.id.user_id_header_id);
+        TextView vName = (TextView) view.findViewById(R.id.user_id_item_name);
+        TextView vAddresses = (TextView) view.findViewById(R.id.user_id_item_addresses);
+
+        byte[] data = cursor.getBlob(1);
+        int isHeader = cursor.getInt(2);
+        Parcel p = Parcel.obtain();
+        p.unmarshall(data, 0, data.length);
+        p.setDataPosition(0);
+        ArrayList<String> uids = p.createStringArrayList();
+        p.recycle();
+
+        if (isHeader == 1) {
+            long masterKeyId = cursor.getLong(0);
+            vHeader.setVisibility(View.VISIBLE);
+            vHeaderId.setText(KeyFormattingUtils.beautifyKeyId(masterKeyId));
+        } else {
+            vHeader.setVisibility(View.GONE);
+        }
+
+        { // first one
+            String userId = uids.get(0);
+            String[] splitUserId = KeyRing.splitUserId(userId);
+            if (splitUserId[0] != null) {
+                vName.setText(splitUserId[0]);
+            } else {
+                vName.setText(R.string.user_id_no_name);
+            }
+        }
+
+        StringBuilder lines = new StringBuilder();
+        for (String uid : uids) {
+            String[] splitUserId = KeyRing.splitUserId(uid);
+            if (splitUserId[1] == null) {
+                continue;
+            }
+            lines.append(splitUserId[1]);
+            if (splitUserId[2] != null) {
+                lines.append(" (").append(splitUserId[2]).append(")");
+            }
+            lines.append('\n');
+        }
+
+        // If we have any data here, show it
+        if (lines.length() > 0) {
+            // delete last newline
+            lines.setLength(lines.length() - 1);
+            vAddresses.setVisibility(View.VISIBLE);
+            vAddresses.setText(lines);
+        } else {
+            vAddresses.setVisibility(View.GONE);
+        }
+
+        final CheckBox vCheckBox = (CheckBox) view.findViewById(R.id.user_id_item_check_box);
+        final int position = cursor.getPosition();
+        vCheckBox.setOnCheckedChangeListener(null);
+        vCheckBox.setChecked(mCheckStates.get(position));
+        vCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
+                mCheckStates.set(position, b);
+            }
+        });
+        vCheckBox.setClickable(false);
+
+        View vUidBody = view.findViewById(R.id.user_id_body);
+        vUidBody.setClickable(true);
+        vUidBody.setOnClickListener(new OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                vCheckBox.toggle();
+            }
+        });
+
+    }
+
+    public ArrayList<String> getSelectedUserIds() {
+        ArrayList<String> result = new ArrayList<String>();
+        for (int i = 0; i < mCheckStates.size(); i++) {
+            if (mCheckStates.get(i)) {
+                mCursor.moveToPosition(i);
+                result.add(mCursor.getString(0));
+            }
+        }
+        return result;
+    }
+
+}
diff --git a/OpenKeychain/src/main/res/layout/certify_key_item.xml b/OpenKeychain/src/main/res/layout/certify_key_item.xml
new file mode 100644
index 000000000..297e0944b
--- /dev/null
+++ b/OpenKeychain/src/main/res/layout/certify_key_item.xml
@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:minHeight="?android:attr/listPreferredItemHeight"
+    android:orientation="vertical"
+    android:singleLine="true">
+
+    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                  android:id="@+id/user_id_header"
+                  android:layout_width="match_parent"
+                  android:layout_height="wrap_content"
+                  android:orientation="horizontal"
+                  android:singleLine="true"
+                  android:clickable="true">
+
+        <TextView
+            android:id="@+id/user_id_header_id"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="0123 4567 890a bcde"
+            android:textAppearance="?android:attr/textAppearanceMedium" />
+
+    </LinearLayout>
+
+    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                  android:id="@+id/user_id_body"
+                  android:layout_width="match_parent"
+                  android:layout_height="wrap_content"
+                  android:minHeight="?android:attr/listPreferredItemHeight"
+                  android:orientation="horizontal"
+                  android:singleLine="true"
+                  android:layout_marginLeft="15dip">
+
+        <CheckBox
+            android:id="@+id/user_id_item_check_box"
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:clickable="false"
+            android:focusable="false" />
+
+        <LinearLayout
+            android:orientation="vertical"
+            android:layout_gravity="center_vertical"
+            android:layout_width="0dip"
+            android:layout_marginLeft="8dp"
+            android:layout_marginTop="4dp"
+            android:layout_marginBottom="4dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1">
+
+            <TextView
+                android:id="@+id/user_id_item_name"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="alice@example.com"
+                android:textAppearance="?android:attr/textAppearanceMedium" />
+
+            <TextView
+                android:id="@+id/user_id_item_addresses"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="alice@example.com\na-lyc@example.com"
+                android:textAppearance="?android:attr/textAppearanceSmall"
+                android:layout_marginLeft="20dip"
+                />
+
+        </LinearLayout>
+    </LinearLayout>
+
+</LinearLayout>
diff --git a/OpenKeychain/src/main/res/layout/multi_certify_key_activity.xml b/OpenKeychain/src/main/res/layout/multi_certify_key_activity.xml
new file mode 100644
index 000000000..c3eaed9a8
--- /dev/null
+++ b/OpenKeychain/src/main/res/layout/multi_certify_key_activity.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:orientation="vertical"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent">
+
+    <include layout="@layout/notify_area" />
+
+    <FrameLayout
+        android:id="@+id/content_frame"
+        android:layout_marginLeft="@dimen/drawer_content_padding"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <fragment
+            android:id="@+id/multi_certify_key_fragment"
+            android:name="org.sufficientlysecure.keychain.ui.MultiCertifyKeyFragment"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent" />
+    </FrameLayout>
+
+</LinearLayout>
\ No newline at end of file
diff --git a/OpenKeychain/src/main/res/layout/multi_certify_key_fragment.xml b/OpenKeychain/src/main/res/layout/multi_certify_key_fragment.xml
new file mode 100644
index 000000000..c55be78fb
--- /dev/null
+++ b/OpenKeychain/src/main/res/layout/multi_certify_key_fragment.xml
@@ -0,0 +1,102 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <ScrollView
+        android:id="@+id/certify_scroll_view"
+        android:layout_width="wrap_content"
+        android:layout_height="match_parent">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingLeft="16dp"
+            android:paddingRight="16dp"
+            android:orientation="vertical">
+
+            <TextView
+                style="@style/SectionHeader"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginBottom="4dp"
+                android:layout_marginTop="14dp"
+                android:text="@string/section_certification_key" />
+
+            <org.sufficientlysecure.keychain.ui.widget.CertifyKeySpinner
+                android:id="@+id/certify_key_spinner"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content" />
+
+            <TextView
+                style="@style/SectionHeader"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="14dp"
+                android:text="@string/section_uids_to_certify" />
+
+            <org.sufficientlysecure.keychain.ui.widget.FixedListView
+                android:id="@+id/view_key_user_ids"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content" />
+
+            <TextView
+                style="@style/SectionHeader"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginBottom="4dp"
+                android:layout_marginTop="14dp"
+                android:text="@string/section_upload_key" />
+
+            <CheckBox
+                android:id="@+id/sign_key_upload_checkbox"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginBottom="4dp"
+                android:layout_marginTop="4dp"
+                android:checked="false"
+                android:text="@string/label_send_key" />
+
+            <TextView
+                style="@style/SectionHeader"
+                android:layout_width="wrap_content"
+                android:layout_height="0dp"
+                android:layout_marginTop="14dp"
+                android:text="@string/section_actions"
+                android:layout_weight="1" />
+
+            <LinearLayout
+                android:id="@+id/certify_key_certify_button"
+                android:layout_width="match_parent"
+                android:layout_height="?android:attr/listPreferredItemHeight"
+                android:clickable="true"
+                android:paddingRight="4dp"
+                android:layout_marginBottom="8dp"
+                style="@style/SelectableItem"
+                android:orientation="horizontal">
+
+                <TextView
+                    android:paddingLeft="8dp"
+                    android:textAppearance="?android:attr/textAppearanceMedium"
+                    android:layout_width="0dip"
+                    android:layout_height="match_parent"
+                    android:text="@string/key_view_action_certify"
+                    android:layout_weight="1"
+                    android:gravity="center_vertical" />
+
+                <ImageView
+                    android:id="@+id/certify_key_action_certify_image"
+                    android:layout_width="wrap_content"
+                    android:layout_height="match_parent"
+                    android:padding="8dp"
+                    android:src="@drawable/status_signature_verified_cutout"
+                    android:layout_gravity="center_vertical" />
+
+            </LinearLayout>
+
+        </LinearLayout>
+
+    </ScrollView>
+
+</LinearLayout>
diff --git a/OpenKeychain/src/main/res/values/strings.xml b/OpenKeychain/src/main/res/values/strings.xml
index 93a6d0da1..438f976e3 100644
--- a/OpenKeychain/src/main/res/values/strings.xml
+++ b/OpenKeychain/src/main/res/values/strings.xml
@@ -134,7 +134,7 @@
     <string name="label_name">"Name"</string>
     <string name="label_comment">"Comment"</string>
     <string name="label_email">"Email"</string>
-    <string name="label_send_key">"Upload key to selected keyserver after certification"</string>
+    <string name="label_send_key">"Synchronize key with public keyservers"</string>
     <string name="label_fingerprint">"Fingerprint"</string>
     <string name="expiry_date_dialog_title">"Set expiry date"</string>
     <string name="label_first_keyserver_is_used">"(First keyserver listed is preferred)"</string>