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package com.zeapo.pwdstore;
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.Fragment;
import android.app.ProgressDialog;
import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
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.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.KeyPair;
import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.FileOutputStream;
public class SshKeyGen extends AppCompatActivity {
// SSH key generation UI
public static class SshKeyGenFragment extends Fragment {
public SshKeyGenFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_ssh_keygen, container, false);
Spinner spinner = (Spinner) v.findViewById(R.id.length);
Integer[] lengths = new Integer[]{2048, 4096};
ArrayAdapter<Integer> adapter = new ArrayAdapter<>(getActivity(),
android.R.layout.simple_spinner_dropdown_item, lengths);
spinner.setAdapter(adapter);
return v;
}
}
// Displays the generated public key .ssh_key.pub
public static class ShowSshKeyFragment extends DialogFragment {
public ShowSshKeyFragment() {
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
final View v = inflater.inflate(R.layout.fragment_show_ssh_key, null);
builder.setView(v);
TextView textView = (TextView) v.findViewById(R.id.public_key);
File file = new File(getActivity().getFilesDir() + "/.ssh_key.pub");
try {
textView.setText(FileUtils.readFileToString(file));
} catch (Exception e) {
System.out.println("Exception caught :(");
e.printStackTrace();
}
builder.setPositiveButton(getResources().getString(R.string.dialog_ok), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (getActivity() instanceof SshKeyGen)
getActivity().finish();
}
});
builder.setNegativeButton(getResources().getString(R.string.dialog_cancel), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
builder.setNeutralButton(getResources().getString(R.string.ssh_keygen_copy), null);
final AlertDialog ad = builder.setTitle("Your public key").create();
ad.setOnShowListener(new DialogInterface.OnShowListener() {
@Override
public void onShow(DialogInterface dialog) {
Button b = ad.getButton(AlertDialog.BUTTON_NEUTRAL);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
TextView textView = (TextView) getDialog().findViewById(R.id.public_key);
ClipboardManager clipboard = (ClipboardManager) getActivity().getSystemService(Context.CLIPBOARD_SERVICE);
ClipData clip = ClipData.newPlainText("public key", textView.getText().toString());
clipboard.setPrimaryClip(clip);
}
});
}
});
return ad;
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getSupportActionBar() != null)
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
setTitle("Generate SSH Key");
setContentView(R.layout.activity_ssh_keygen);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.replace(android.R.id.content, new SshKeyGenFragment()).commit();
}
}
private class generateTask extends AsyncTask<View, Void, Exception> {
private ProgressDialog pd;
protected Exception doInBackground(View... views) {
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(views[0].getWindowToken(), 0);
Spinner spinner = (Spinner) findViewById(R.id.length);
int length = (Integer) spinner.getSelectedItem();
TextView textView = (TextView) findViewById(R.id.passphrase);
String passphrase = textView.getText().toString();
textView = (TextView) findViewById(R.id.comment);
String comment = textView.getText().toString();
JSch jsch = new JSch();
try {
KeyPair kp = KeyPair.genKeyPair(jsch, KeyPair.RSA, length);
File file = new File(getFilesDir() + "/.ssh_key");
FileOutputStream out = new FileOutputStream(file, false);
kp.writePrivateKey(out, passphrase.getBytes());
file = new File(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 onPreExecute() {
super.onPreExecute();
pd = ProgressDialog.show(SshKeyGen.this, "", "Generating keys");
}
@Override
protected void onPostExecute(Exception e) {
super.onPostExecute(e);
pd.dismiss();
if (e == null) {
Toast.makeText(SshKeyGen.this, "SSH-key generated", Toast.LENGTH_LONG).show();
DialogFragment df = new ShowSshKeyFragment();
df.show(getFragmentManager(), "public_key");
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
SharedPreferences.Editor editor = prefs.edit();
editor.putBoolean("use_generated_key", true);
editor.apply();
} else {
new AlertDialog.Builder(SshKeyGen.this)
.setTitle("Error while trying to generate the ssh-key")
.setMessage(getResources().getString(R.string.ssh_key_error_dialog_text) + e.getMessage())
.setPositiveButton(getResources().getString(R.string.dialog_ok), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
// pass
}
}).show();
}
}
}
// 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) {
new generateTask().execute(view);
}
}
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