keyserver verification on addition

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

@@ -20,6 +20,9 @@ package org.sufficientlysecure.keychain.ui;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
+import android.os.Messenger;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnClickListener;
@@ -28,6 +31,8 @@ import android.widget.TextView;
 
 import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.ui.base.BaseActivity;
+import org.sufficientlysecure.keychain.ui.dialog.AddKeyserverDialogFragment;
+import org.sufficientlysecure.keychain.ui.util.Notify;
 import org.sufficientlysecure.keychain.ui.widget.Editor;
 import org.sufficientlysecure.keychain.ui.widget.Editor.EditorListener;
 import org.sufficientlysecure.keychain.ui.widget.KeyServerEditor;
@@ -95,7 +100,7 @@ public class SettingsKeyServerActivity extends BaseActivity implements OnClickLi
         Intent intent = getIntent();
         String servers[] = intent.getStringArrayExtra(EXTRA_KEY_SERVERS);
         makeServerList(servers);
-   }
+    }
 
     @Override
     protected void initLayout() {
@@ -124,10 +129,63 @@ public class SettingsKeyServerActivity extends BaseActivity implements OnClickLi
 
     }
 
+    // button to add keyserver clicked
     public void onClick(View v) {
+        Handler returnHandler = new Handler() {
+            @Override
+            public void handleMessage(Message message) {
+                Bundle data = message.getData();
+                switch (message.what) {
+                    case AddKeyserverDialogFragment.MESSAGE_OKAY: {
+                        boolean verified = data.getBoolean(AddKeyserverDialogFragment.MESSAGE_VERIFIED);
+                        if (verified) {
+                            Notify.create(SettingsKeyServerActivity.this,
+                                    R.string.add_keyserver_verified, Notify.Style.OK).show();
+                        } else {
+                            Notify.create(SettingsKeyServerActivity.this,
+                                    R.string.add_keyserver_without_verification,
+                                    Notify.Style.WARN).show();
+                        }
+                        String keyserver = data.getString(AddKeyserverDialogFragment.MESSAGE_KEYSERVER);
+                        addKeyserver(keyserver);
+                        break;
+                    }
+                    case AddKeyserverDialogFragment.MESSAGE_VERIFICATION_FAILED: {
+                        AddKeyserverDialogFragment.FailureReason failureReason =
+                                (AddKeyserverDialogFragment.FailureReason) data.getSerializable(
+                                        AddKeyserverDialogFragment.MESSAGE_FAILURE_REASON);
+                        switch (failureReason) {
+                            case CONNECTION_FAILED: {
+                                Notify.create(SettingsKeyServerActivity.this,
+                                        R.string.add_keyserver_connection_failed,
+                                        Notify.Style.ERROR).show();
+                                break;
+                            }
+                            case INVALID_URL: {
+                                Notify.create(SettingsKeyServerActivity.this,
+                                        R.string.add_keyserver_invalid_url,
+                                        Notify.Style.ERROR).show();
+                                break;
+                            }
+                        }
+                        break;
+                    }
+                }
+            }
+        };
+
+        // Create a new Messenger for the communication back
+        Messenger messenger = new Messenger(returnHandler);
+        AddKeyserverDialogFragment dialogFragment = AddKeyserverDialogFragment
+                .newInstance(messenger, R.string.add_keyserver_dialog_title);
+        dialogFragment.show(getSupportFragmentManager(), "addKeyserverDialog");
+    }
+
+    public void addKeyserver(String keyserverUrl) {
         KeyServerEditor view = (KeyServerEditor) mInflater.inflate(R.layout.key_server_editor,
                 mEditors, false);
         view.setEditorListener(this);
+        view.setValue(keyserverUrl);
         mEditors.addView(view);
     }
 

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddKeyserverDialogFragment.java

@@ -0,0 +1,320 @@
+/*
+ * Copyright (C) 2012-2014 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.dialog;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.app.ProgressDialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.net.Uri;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.os.Message;
+import android.os.Messenger;
+import android.os.RemoteException;
+import android.support.v4.app.DialogFragment;
+import android.test.suitebuilder.TestSuiteBuilder;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.inputmethod.EditorInfo;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.Button;
+import android.widget.CheckBox;
+import android.widget.EditText;
+import android.widget.TextView;
+import android.widget.TextView.OnEditorActionListener;
+
+import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.util.Log;
+import org.sufficientlysecure.keychain.util.TlsHelper;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+
+import javax.net.ssl.HttpsURLConnection;
+
+public class AddKeyserverDialogFragment extends DialogFragment implements OnEditorActionListener {
+    private static final String ARG_MESSENGER = "messenger";
+    private static final String ARG_TITLE = "title";
+
+    public static final int MESSAGE_OKAY = 1;
+    public static final int MESSAGE_VERIFICATION_FAILED = 2;
+
+    public static final String MESSAGE_KEYSERVER = "new_keyserver";
+    public static final String MESSAGE_VERIFIED = "verified";
+    public static final String MESSAGE_FAILURE_REASON = "failure_reason";
+
+    private Messenger mMessenger;
+    private EditText mKeyserverEditText;
+    private CheckBox mVerifyKeyserverCheckBox;
+
+    public static enum FailureReason {
+        INVALID_URL,
+        CONNECTION_FAILED
+    }
+
+    ;
+
+    /**
+     * Creates new instance of this dialog fragment
+     *
+     * @param title     title of dialog
+     * @param messenger to communicate back after setting the passphrase
+     * @return
+     */
+    public static AddKeyserverDialogFragment newInstance(Messenger messenger, int title) {
+        AddKeyserverDialogFragment frag = new AddKeyserverDialogFragment();
+        Bundle args = new Bundle();
+        args.putInt(ARG_TITLE, title);
+        args.putParcelable(ARG_MESSENGER, messenger);
+
+        frag.setArguments(args);
+
+        return frag;
+    }
+
+    /**
+     * Creates dialog
+     */
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        final Activity activity = getActivity();
+
+        int title = getArguments().getInt(ARG_TITLE);
+        mMessenger = getArguments().getParcelable(ARG_MESSENGER);
+
+        CustomAlertDialogBuilder alert = new CustomAlertDialogBuilder(activity);
+
+        alert.setTitle(title);
+
+        LayoutInflater inflater = activity.getLayoutInflater();
+        View view = inflater.inflate(R.layout.add_keyserver_dialog, null);
+        alert.setView(view);
+
+        mKeyserverEditText = (EditText) view.findViewById(R.id.keyserver_url_edit_text);
+        mVerifyKeyserverCheckBox = (CheckBox) view.findViewById(R.id.verify_keyserver_checkbox);
+
+        // we don't want dialog to be dismissed on click, thereby requiring the hack seen below
+        // and in onStart
+        alert.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int id) {
+                // we need to have an empty listener to prevent errors on some devices as mentioned
+                // at http://stackoverflow.com/q/13746412/3000919
+                // actual listener set in onStart
+            }
+        });
+
+        alert.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
+
+            @Override
+            public void onClick(DialogInterface dialog, int id) {
+                dismiss();
+            }
+        });
+
+        // Hack to open keyboard.
+        // This is the only method that I found to work across all Android versions
+        // http://turbomanage.wordpress.com/2012/05/02/show-soft-keyboard-automatically-when-edittext-receives-focus/
+        // Notes: * onCreateView can't be used because we want to add buttons to the dialog
+        //        * opening in onActivityCreated does not work on Android 4.4
+        mKeyserverEditText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
+            @Override
+            public void onFocusChange(View v, boolean hasFocus) {
+                mKeyserverEditText.post(new Runnable() {
+                    @Override
+                    public void run() {
+                        InputMethodManager imm = (InputMethodManager) getActivity()
+                                .getSystemService(Context.INPUT_METHOD_SERVICE);
+                        imm.showSoftInput(mKeyserverEditText, InputMethodManager.SHOW_IMPLICIT);
+                    }
+                });
+            }
+        });
+        mKeyserverEditText.requestFocus();
+
+        mKeyserverEditText.setImeActionLabel(getString(android.R.string.ok),
+                EditorInfo.IME_ACTION_DONE);
+        mKeyserverEditText.setOnEditorActionListener(this);
+
+        return alert.show();
+    }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+        AlertDialog addKeyserverDialog = (AlertDialog) getDialog();
+        if (addKeyserverDialog != null) {
+            Button positiveButton = addKeyserverDialog.getButton(Dialog.BUTTON_POSITIVE);
+            positiveButton.setOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    String keyserverUrl = mKeyserverEditText.getText().toString();
+                    if (mVerifyKeyserverCheckBox.isChecked()) {
+                        verifyConnection(keyserverUrl);
+                    } else {
+                        dismiss();
+                        // return unverified keyserver back to activity
+                        addKeyserver(keyserverUrl, false);
+                    }
+                }
+            });
+        }
+    }
+
+    public void addKeyserver(String keyserver, boolean verified) {
+        dismiss();
+        Bundle data = new Bundle();
+        data.putString(MESSAGE_KEYSERVER, keyserver);
+        data.putBoolean(MESSAGE_VERIFIED, verified);
+
+        sendMessageToHandler(MESSAGE_OKAY, data);
+    }
+
+    public void verificationFailed(FailureReason reason) {
+        Bundle data = new Bundle();
+        data.putSerializable(MESSAGE_FAILURE_REASON, reason);
+
+        sendMessageToHandler(MESSAGE_VERIFICATION_FAILED, data);
+    }
+
+    public void verifyConnection(String keyserver) {
+
+        new AsyncTask<String, Void, FailureReason>() {
+            ProgressDialog mProgressDialog;
+            String mKeyserver;
+
+            @Override
+            protected void onPreExecute() {
+                mProgressDialog = new ProgressDialog(getActivity());
+                mProgressDialog.setMessage(getString(R.string.progress_verifying_keyserver_url));
+                mProgressDialog.setCancelable(false);
+                mProgressDialog.show();
+            }
+
+            @Override
+            protected FailureReason doInBackground(String... keyservers) {
+                mKeyserver = keyservers[0];
+                FailureReason reason = null;
+                try {
+                    // replace hkps/hkp scheme and reconstruct Uri
+                    Uri keyserverUri = Uri.parse(mKeyserver);
+                    String scheme = keyserverUri.getScheme();
+                    String schemeSpecificPart = keyserverUri.getSchemeSpecificPart();
+                    String fragment = keyserverUri.getFragment();
+                    if (scheme == null) throw new MalformedURLException();
+                    if (scheme.equalsIgnoreCase("hkps")) scheme = "https";
+                    else if (scheme.equalsIgnoreCase("hkp")) scheme = "http";
+                    URI newKeyserver = new URI(scheme, schemeSpecificPart, fragment);
+
+                    Log.d("Converted URL", newKeyserver.toString());
+                    TlsHelper.openConnection(newKeyserver.toURL()).getInputStream();
+                } catch (TlsHelper.TlsHelperException e) {
+                    reason = FailureReason.CONNECTION_FAILED;
+                } catch (MalformedURLException e) {
+                    Log.w(Constants.TAG, "Invalid keyserver URL entered by user.");
+                    reason = FailureReason.INVALID_URL;
+                } catch (URISyntaxException e) {
+                    Log.w(Constants.TAG, "Invalid keyserver URL entered by user.");
+                    reason = FailureReason.INVALID_URL;
+                } catch (IOException e) {
+                    Log.w(Constants.TAG, "Could not connect to entered keyserver url");
+                    reason = FailureReason.CONNECTION_FAILED;
+                }
+                return reason;
+            }
+
+            @Override
+            protected void onPostExecute(FailureReason failureReason) {
+                mProgressDialog.dismiss();
+                if (failureReason == null) {
+                    addKeyserver(mKeyserver, true);
+                } else {
+                    verificationFailed(failureReason);
+                }
+            }
+        }.execute(keyserver);
+    }
+
+    @Override
+    public void onDismiss(DialogInterface dialog) {
+        super.onDismiss(dialog);
+
+        // hide keyboard on dismiss
+        hideKeyboard();
+    }
+
+    private void hideKeyboard() {
+        if (getActivity() == null) {
+            return;
+        }
+        InputMethodManager inputManager = (InputMethodManager) getActivity()
+                .getSystemService(Context.INPUT_METHOD_SERVICE);
+
+        //check if no view has focus:
+        View v = getActivity().getCurrentFocus();
+        if (v == null)
+            return;
+
+        inputManager.hideSoftInputFromWindow(v.getWindowToken(), 0);
+    }
+
+    /**
+     * Associate the "done" button on the soft keyboard with the okay button in the view
+     */
+    @Override
+    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
+        if (EditorInfo.IME_ACTION_DONE == actionId) {
+            AlertDialog dialog = ((AlertDialog) getDialog());
+            Button bt = dialog.getButton(AlertDialog.BUTTON_POSITIVE);
+
+            bt.performClick();
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Send message back to handler which is initialized in a activity
+     *
+     * @param what Message integer you want to send
+     */
+    private void sendMessageToHandler(Integer what, Bundle data) {
+        Message msg = Message.obtain();
+        msg.what = what;
+        if (data != null) {
+            msg.setData(data);
+        }
+
+        try {
+            mMessenger.send(msg);
+        } catch (RemoteException e) {
+            Log.w(Constants.TAG, "Exception sending message, Is handler present?", e);
+        } catch (NullPointerException e) {
+            Log.w(Constants.TAG, "Messenger is null!", e);
+        }
+    }
+}

OpenKeychain/src/main/res/layout/add_keyserver_dialog.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:custom="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:paddingBottom="16dp"
+    android:paddingLeft="24dp"
+    android:paddingRight="24dp"
+    android:paddingTop="16dp">
+
+    <EditText
+        android:id="@+id/keyserver_url_edit_text"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_horizontal"
+        android:layout_marginBottom="8dp"
+        android:ems="10"
+        android:hint="@string/label_enter_keyserver_url"
+        android:imeOptions="actionDone" />
+
+    <CheckBox
+        android:id="@+id/verify_keyserver_checkbox"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/label_verify_keyserver"
+        android:checked="true"/>
+
+</LinearLayout>

OpenKeychain/src/main/res/values/strings.xml

@@ -86,6 +86,7 @@
     <string name="btn_encrypt_text">"Encrypt text"</string>
     <string name="btn_add_email">"Add additional email address"</string>
     <string name="btn_unlock">"Unlock"</string>
+    <string name="btn_add_keyserver">"Add"</string>
 
     <!-- menu -->
     <string name="menu_preferences">"Settings"</string>
@@ -152,6 +153,8 @@
     <string name="label_enable_compression">"Enable compression"</string>
     <string name="label_encrypt_filenames">"Encrypt filenames"</string>
     <string name="label_hidden_recipients">"Hide recipients"</string>
+    <string name="label_verify_keyserver">"Verify Keyserver"</string>
+    <string name="label_enter_keyserver_url">"Enter Keyserver URL"</string>
 
     <string name="pref_keyserver">"Search Keyserver"</string>
     <string name="pref_keyserver_summary">"Search HKP keyserver"</string>
@@ -353,6 +356,8 @@
     <string name="progress_con_saving">"consolidate: saving to cache…"</string>
     <string name="progress_con_reimport">"consolidate: reimporting…"</string>
 
+    <string name="progress_verifying_keyserver_url">"verifying keyserver…"</string>
+
     <!-- action strings -->
     <string name="hint_cloud_search_hint">"Search via Name, Email…"</string>
 
@@ -645,6 +650,13 @@
 
     <string name="view_key_fragment_no_system_contact">"&lt;none&gt;"</string>
 
+    <!-- Add keyserver -->
+    <string name="add_keyserver_dialog_title">"Add Keyserver"</string>
+    <string name="add_keyserver_verified">"Keyserver verified!"</string>
+    <string name="add_keyserver_without_verification">"Keyserver added without verification."</string>
+    <string name="add_keyserver_invalid_url">"Invalid URL!"</string>
+    <string name="add_keyserver_connection_failed">"Failed to connect to keyserver. Please check the URL and your internet connection."</string>
+
     <!-- Navigation Drawer -->
     <string name="nav_keys">"Keys"</string>
     <string name="nav_encrypt_decrypt">"Encrypt/Decrypt"</string>