Make it possible to have open tether network

Previously people could have open tether networks but a restrction
was placed on this sometime in the past. However there is no migration
plan in place for people with open tether networks which will cause
problems when the new requirements are enforced. This CL makes it
so tether networks can be open once more.

Test: robotests
Bug: 65784990
Change-Id: I6e350dd53b9b9f987dd5a4cc317ba18d7f50df79

src/com/android/settings/widget/ValidatedEditTextPreference.java

@@ -86,9 +86,14 @@ public class ValidatedEditTextPreference extends CustomEditTextPreference {
         super.onBindViewHolder(holder);
 
         final TextView textView = (TextView) holder.findViewById(android.R.id.summary);
-        if (textView != null && mIsSummaryPassword) {
+        if (textView == null) {
+            return;
+        }
+        if (mIsSummaryPassword) {
             textView.setInputType(
                     InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
+        } else {
+            textView.setInputType(InputType.TYPE_CLASS_TEXT);
         }
     }
 

src/com/android/settings/wifi/WifiUtils.java

@@ -50,10 +50,11 @@ public class WifiUtils {
         return ssid.length() < SSID_ASCII_MIN_LENGTH;
     }
 
-    public static boolean isPasswordValid(String password) {
+    public static boolean isHotspotPasswordValid(String password) {
         if (TextUtils.isEmpty(password)) {
-            return false;
+            return true;
         }
+
         final int length = password.length();
         return length >= PASSWORD_MIN_LENGTH && length <= PASSWORD_MAX_LENGTH;
     }

src/com/android/settings/wifi/tether/WifiTetherPasswordPreferenceController.java

@@ -20,11 +20,15 @@ import android.content.Context;
 import android.net.wifi.WifiConfiguration;
 import android.support.v7.preference.EditTextPreference;
 import android.support.v7.preference.Preference;
+import android.text.TextUtils;
 import android.util.Log;
 
+import com.android.settings.R;
 import com.android.settings.widget.ValidatedEditTextPreference;
 import com.android.settings.wifi.WifiUtils;
 
+import java.util.UUID;
+
 public class WifiTetherPasswordPreferenceController extends WifiTetherBasePreferenceController
         implements ValidatedEditTextPreference.Validator {
 
@@ -49,6 +53,8 @@ public class WifiTetherPasswordPreferenceController extends WifiTetherBasePrefer
         if (config != null) {
             mPassword = config.preSharedKey;
             Log.d(TAG, "Updating password in Preference, " + mPassword);
+        } else {
+            mPassword = generateRandomPassword();
         }
         ((ValidatedEditTextPreference) mPreference).setValidator(this);
         ((ValidatedEditTextPreference) mPreference).setIsSummaryPassword(true);
@@ -67,13 +73,35 @@ public class WifiTetherPasswordPreferenceController extends WifiTetherBasePrefer
         return mPassword;
     }
 
+    public int getSecuritySettingForPassword() {
+        // We should return NONE when no password is set
+        if (TextUtils.isEmpty(mPassword)) {
+            return WifiConfiguration.KeyMgmt.NONE;
+        }
+        // Only other currently supported type is WPA2 so we'll try that
+        return WifiConfiguration.KeyMgmt.WPA2_PSK;
+    }
+
     @Override
     public boolean isTextValid(String value) {
-        return WifiUtils.isPasswordValid(value);
+        return WifiUtils.isHotspotPasswordValid(value);
+    }
+
+    private static String generateRandomPassword() {
+        String randomUUID = UUID.randomUUID().toString();
+        //first 12 chars from xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
+        return randomUUID.substring(0, 8) + randomUUID.substring(9, 13);
     }
 
     private void updatePasswordDisplay(EditTextPreference preference) {
-        preference.setText(mPassword);
-        preference.setSummary(mPassword);
+        ValidatedEditTextPreference pref = (ValidatedEditTextPreference) preference;
+        pref.setText(mPassword);
+        if (!TextUtils.isEmpty(mPassword)) {
+            pref.setIsSummaryPassword(true);
+            pref.setSummary(mPassword);
+        } else {
+            pref.setIsSummaryPassword(false);
+            pref.setSummary(R.string.wifi_hotspot_no_password_subtext);
+        }
     }
 }

src/com/android/settings/wifi/tether/WifiTetherSettings.java

@@ -161,8 +161,8 @@ public class WifiTetherSettings extends RestrictedDashboardFragment
 
         config.SSID = mSSIDPreferenceController.getSSID();
         config.preSharedKey = mPasswordPreferenceController.getPassword();
-        ensureWifiConfigHasPassword(config);
-        config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA2_PSK);
+        config.allowedKeyManagement.set(
+                mPasswordPreferenceController.getSecuritySettingForPassword());
         config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
         config.apBand = mApBandPreferenceController.getBandIndex();
         return config;
@@ -182,15 +182,6 @@ public class WifiTetherSettings extends RestrictedDashboardFragment
                 .updateDisplay();
     }
 
-    @VisibleForTesting
-    static void ensureWifiConfigHasPassword(WifiConfiguration config) {
-        if (TextUtils.isEmpty(config.preSharedKey)) {
-            String randomUUID = UUID.randomUUID().toString();
-            //first 12 chars from xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
-            config.preSharedKey = randomUUID.substring(0, 8) + randomUUID.substring(9, 13);
-        }
-    }
-
     @VisibleForTesting
     class TetherChangeReceiver extends BroadcastReceiver {
         @Override