validate input onion address, save, enable connect button

app/src/main/java/im/ricochet/androidod/ConnectActivity.java

@@ -4,9 +4,12 @@ import android.content.SharedPreferences;
 import android.os.AsyncTask;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
+import android.text.Editable;
+import android.text.TextWatcher;
 import android.util.Log;
 import android.view.View;
 import android.widget.Button;
+import android.widget.EditText;
 import android.widget.ProgressBar;
 import android.widget.TextView;
 
@@ -14,9 +17,12 @@ import goRicochetMobile.GoRicochetMobile;
 
 public class ConnectActivity extends AppCompatActivity {
 
+    private static final int ONION_ADDRESS_LENGTH = 16;
     public static final String PREFERNCE_FILE = "im.ricochet.PREFERENCE_FILE";
     private static final String TAG = "InitActivity";
     private static final String PRIVATE_KEY_KEY = "privateKey";
+    private static final String CONNECT_TO_ADDRESS_KEY = "connectToAddress";
+    private static final String RICOCHET_ADDRESS_PREFIX = "ricochet:";
 
     Button regenButton;
     Button connectButton;
@@ -25,8 +31,9 @@ public class ConnectActivity extends AppCompatActivity {
     TextView connectStatusText;
     TextView regenIdentStatusText;
     TextView idetityText;
+    EditText addressText;
 
-
+    SharedPreferences prefs;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -43,6 +50,9 @@ public class ConnectActivity extends AppCompatActivity {
         connectButton = (Button)findViewById(R.id.connectButton);
         connectSpinner = (ProgressBar)findViewById(R.id.connectProgressBar);
         regenIdentSpinner = (ProgressBar)findViewById(R.id.regenIdentProgressBar);
+        addressText = (EditText)findViewById(R.id.addressText);
+
+        prefs = getSharedPreferences(PREFERNCE_FILE, MODE_PRIVATE);
 
         regenButton.setOnClickListener(new View.OnClickListener() {
             public void onClick(View v) {
@@ -51,7 +61,21 @@ public class ConnectActivity extends AppCompatActivity {
             }
         });
 
-        SharedPreferences prefs = getSharedPreferences(PREFERNCE_FILE, MODE_PRIVATE);
+        addressText.addTextChangedListener(new TextWatcher(){
+            @Override
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+                validateOnionAddress();
+            }
+
+            @Override
+            public void afterTextChanged(Editable s) {
+            }
+        });
+
         String privateKey = prefs.getString(PRIVATE_KEY_KEY, "");
         Log.i(TAG, "Private key loaded:\n"+privateKey);
         if (privateKey.equals("")) {
@@ -65,6 +89,10 @@ public class ConnectActivity extends AppCompatActivity {
             regenButton.setEnabled(true);
         }
 
+        String connectToAddress = prefs.getString(CONNECT_TO_ADDRESS_KEY, RICOCHET_ADDRESS_PREFIX);
+        addressText.setText(connectToAddress);
+        validateOnionAddress();
+
         /*Log.i(TAG, "Ready!");
         connectStatusText.setText("Ready!");
         ProgressBar progressBar = (ProgressBar)findViewById(im.ricochet.androidod.R.id.progressBar);
@@ -87,6 +115,18 @@ public class ConnectActivity extends AppCompatActivity {
         idetityText.setText("ricochet:" + addr);
     }
 
+    private void validateOnionAddress() {
+        String address = addressText.getText().toString();
+        if (address.startsWith(RICOCHET_ADDRESS_PREFIX) && address.length() == ONION_ADDRESS_LENGTH + RICOCHET_ADDRESS_PREFIX.length()) {
+            SharedPreferences.Editor prefsEditor = prefs.edit();
+            prefsEditor.putString(CONNECT_TO_ADDRESS_KEY, address);
+            prefsEditor.commit();
+            connectButton.setEnabled(true);
+        } else {
+            connectButton.setEnabled(false);
+        }
+    }
+
     private class RegenIdentTask extends AsyncTask<Void, Void, String> {
         @Override
         protected void onPreExecute() {
@@ -104,7 +144,6 @@ public class ConnectActivity extends AppCompatActivity {
             try {
                 privateKey = GoRicochetMobile.generatePrivateKey();
 
-                SharedPreferences prefs = getSharedPreferences(PREFERNCE_FILE, MODE_PRIVATE);
                 SharedPreferences.Editor prefsEditor = prefs.edit();
                 prefsEditor.putString(PRIVATE_KEY_KEY, privateKey);
                 prefsEditor.commit();
@@ -120,7 +159,7 @@ public class ConnectActivity extends AppCompatActivity {
             Log.i(TAG, "RegenIdentTask.onPostExecute(): " + privateKey);
             regenIdentSpinner.setVisibility(View.INVISIBLE);
             regenButton.setEnabled(true);
-            connectButton.setEnabled(true);
+            validateOnionAddress();
             if (privateKey == null) {
                 regenIdentStatusText.setText("ERROR: unable to generate new identity");
             } else {

app/src/main/res/layout/activity_connect.xml

@@ -20,20 +20,22 @@
 
     <EditText
         android:id="@+id/addressText"
-        android:layout_width="wrap_content"
+        android:layout_width="241dp"
-        android:layout_height="wrap_content"
+        android:layout_height="42dp"
+        android:layout_marginEnd="8dp"
         android:layout_marginLeft="8dp"
         android:layout_marginRight="8dp"
-        android:layout_marginTop="8dp"
+        android:layout_marginStart="8dp"
+        android:layout_marginTop="9dp"
         android:ems="10"
         android:inputType="text"
+        android:minEms="26"
         android:text="ricochet:"
-        app:layout_constraintHorizontal_bias="0.503"
+        app:layout_constraintHorizontal_bias="0.518"
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/textView"
-        android:layout_marginStart="8dp"
+        tools:layout_editor_absoluteX="50dp" />
-        android:layout_marginEnd="8dp" />
 
     <TextView
         android:id="@+id/textView"