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package com.zeapo.pwdstore;
import android.annotation.SuppressLint;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Typeface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.InputType;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.AppCompatTextView;
import androidx.fragment.app.DialogFragment;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.preference.PreferenceManager;
import com.google.android.material.dialog.MaterialAlertDialogBuilder;
import com.google.android.material.textfield.TextInputEditText;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.KeyPair;
import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.FileOutputStream;
import java.lang.ref.WeakReference;
import java.nio.charset.StandardCharsets;
public class SshKeyGen extends AppCompatActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getSupportActionBar() != null)
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
setTitle("Generate SSH Key");
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.replace(android.R.id.content, new SshKeyGenFragment()).commit();
}
}
// Invoked when 'Generate' button of SshKeyGenFragment clicked. Generates a
// private and public key, then replaces the SshKeyGenFragment with a
// ShowSshKeyFragment which displays the public key.
public void generate(View view) {
String length = Integer.toString((Integer) ((Spinner) findViewById(R.id.length)).getSelectedItem());
String passphrase = ((EditText) findViewById(R.id.passphrase)).getText().toString();
String comment = ((EditText) findViewById(R.id.comment)).getText().toString();
new KeyGenerateTask(this).execute(length, passphrase, comment);
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
}
// SSH key generation UI
public static class SshKeyGenFragment extends Fragment {
public SshKeyGenFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View v = inflater.inflate(R.layout.fragment_ssh_keygen, container, false);
Typeface monoTypeface = Typeface.createFromAsset(requireContext().getAssets(), "fonts/sourcecodepro.ttf");
Spinner spinner = v.findViewById(R.id.length);
Integer[] lengths = new Integer[]{2048, 4096};
ArrayAdapter<Integer> adapter = new ArrayAdapter<>(requireContext(),
android.R.layout.simple_spinner_dropdown_item, lengths);
spinner.setAdapter(adapter);
((TextInputEditText) v.findViewById(R.id.passphrase)).setTypeface(monoTypeface);
final CheckBox checkbox = v.findViewById(R.id.show_passphrase);
checkbox.setOnCheckedChangeListener((buttonView, isChecked) -> {
final TextInputEditText editText = v.findViewById(R.id.passphrase);
final int selection = editText.getSelectionEnd();
if (isChecked) {
editText.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
} else {
editText.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
}
editText.setSelection(selection);
});
return v;
}
}
// Displays the generated public key .ssh_key.pub
public static class ShowSshKeyFragment extends DialogFragment {
public ShowSshKeyFragment() {
}
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final FragmentActivity activity = requireActivity();
final MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(requireContext());
LayoutInflater inflater = activity.getLayoutInflater();
@SuppressLint("InflateParams") final View v = inflater.inflate(R.layout.fragment_show_ssh_key, null);
builder.setView(v);
AppCompatTextView textView = v.findViewById(R.id.public_key);
File file = new File(activity.getFilesDir() + "/.ssh_key.pub");
try {
textView.setText(FileUtils.readFileToString(file, StandardCharsets.UTF_8));
} catch (Exception e) {
System.out.println("Exception caught :(");
e.printStackTrace();
}
builder.setPositiveButton(getResources().getString(R.string.dialog_ok), (dialog, which) -> {
if (activity instanceof SshKeyGen)
activity.finish();
});
builder.setNegativeButton(getResources().getString(R.string.dialog_cancel), (dialog, which) -> {
});
builder.setNeutralButton(getResources().getString(R.string.ssh_keygen_copy), null);
final AlertDialog ad = builder.setTitle("Your public key").create();
ad.setOnShowListener(dialog -> {
Button b = ad.getButton(AlertDialog.BUTTON_NEUTRAL);
b.setOnClickListener(v1 -> {
AppCompatTextView textView1 = getDialog().findViewById(R.id.public_key);
ClipboardManager clipboard = (ClipboardManager) activity.getSystemService(Context.CLIPBOARD_SERVICE);
ClipData clip = ClipData.newPlainText("public key", textView1.getText().toString());
clipboard.setPrimaryClip(clip);
});
});
return ad;
}
}
private static class KeyGenerateTask extends AsyncTask<String, Void, Exception> {
private ProgressDialog pd;
private WeakReference<SshKeyGen> weakReference;
private KeyGenerateTask(final SshKeyGen activity) {
weakReference = new WeakReference<>(activity);
}
@Override
protected void onPreExecute() {
super.onPreExecute();
pd = ProgressDialog.show(weakReference.get(), "", "Generating keys");
}
protected Exception doInBackground(String... strings) {
int length = Integer.parseInt(strings[0]);
String passphrase = strings[1];
String comment = strings[2];
JSch jsch = new JSch();
try {
KeyPair kp = KeyPair.genKeyPair(jsch, KeyPair.RSA, length);
File file = new File(weakReference.get().getFilesDir() + "/.ssh_key");
FileOutputStream out = new FileOutputStream(file, false);
if (passphrase.length() > 0) {
kp.writePrivateKey(out, passphrase.getBytes());
} else {
kp.writePrivateKey(out);
}
file = new File(weakReference.get().getFilesDir() + "/.ssh_key.pub");
out = new FileOutputStream(file, false);
kp.writePublicKey(out, comment);
return null;
} catch (Exception e) {
System.out.println("Exception caught :(");
e.printStackTrace();
return e;
}
}
@Override
protected void onPostExecute(Exception e) {
super.onPostExecute(e);
pd.dismiss();
if (e == null) {
Toast.makeText(weakReference.get(), "SSH-key generated", Toast.LENGTH_LONG).show();
DialogFragment df = new ShowSshKeyFragment();
df.show(weakReference.get().getSupportFragmentManager(), "public_key");
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(weakReference.get());
SharedPreferences.Editor editor = prefs.edit();
editor.putBoolean("use_generated_key", true);
editor.apply();
} else {
new MaterialAlertDialogBuilder(weakReference.get())
.setTitle("Error while trying to generate the ssh-key")
.setMessage(weakReference.get().getResources().getString(R.string.ssh_key_error_dialog_text) + e.getMessage())
.setPositiveButton(weakReference.get().getResources().getString(R.string.dialog_ok), (dialogInterface, i) -> {
// pass
}).show();
}
}
}
}
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