Can ask user his password

lib/helpers/api_helper.dart

@@ -80,7 +80,7 @@ class APIHelper {
         EventsHelper.emit(InvalidLoginTokensEvent());
 
       if (response.statusCode != HttpStatus.ok)
-        return APIResponse(response.statusCode, null);
+        return APIResponse(response.statusCode, response.data);
 
       return APIResponse(response.statusCode, response.data);
     } catch (e, stack) {

lib/helpers/settings_helper.dart

@@ -143,4 +143,12 @@ class SettingsHelper {
               .addInt("emojiID", emojiID)
               .exec())
           .assertOk();
+
+  /// Check current user password
+  ///
+  /// Throws in case of failure
+  static Future<void> checkUserPassword(String password) async =>
+      await APIRequest(uri: "settings/check_password", needLogin: true)
+          .addString("password", password)
+          .execWithThrow();
 }

lib/models/api_request.dart

@@ -66,6 +66,9 @@ class APIRequest {
   /// Execute the request
   Future<APIResponse> exec() async => APIHelper().exec(this);
 
+  /// Execute the request, throws an exception in case of failure
+  Future<APIResponse> execWithThrow() async => (await exec()).assertOk();
+
   /// Execute the request with files
   Future<APIResponse> execWithFiles() async => APIHelper().execWithFiles(this);
 }

lib/models/api_response.dart

@@ -21,7 +21,7 @@ class APIResponse {
   APIResponse assertOk() {
 
     if(!this.isOK)
-      throw Exception("Request failed with status $code");
+      throw Exception("Request failed with status $code -> $content");
 
     return this;
   }

lib/ui/dialogs/input_user_password_dialog.dart

@@ -0,0 +1,85 @@
+import 'package:comunic/helpers/settings_helper.dart';
+import 'package:comunic/ui/widgets/safe_state.dart';
+import 'package:comunic/utils/input_utils.dart';
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:comunic/utils/ui_utils.dart';
+import 'package:flutter/material.dart';
+
+/// Ask the user to enter his password
+///
+/// @author Pierre Hubert
+
+enum _Status { NONE, CHECKING, ERROR }
+
+Future<String> showUserPasswordDialog(BuildContext context) async {
+  return await showDialog(
+      context: context, builder: (c) => _InputUserPasswordDialog());
+}
+
+class _InputUserPasswordDialog extends StatefulWidget {
+  @override
+  __InputUserPasswordDialogState createState() =>
+      __InputUserPasswordDialogState();
+}
+
+class __InputUserPasswordDialogState
+    extends SafeState<_InputUserPasswordDialog> {
+  final _controller = TextEditingController();
+  var _status = _Status.NONE;
+
+  String get _currPass => _controller.text;
+
+  bool get _canSubmit =>
+      validatePassword(_controller.text) && _status != _Status.CHECKING;
+
+  void _setStatus(_Status s) => setState(() => _status = s);
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: Text(tr("Password required")),
+      content: _buildContent(),
+      actions: <Widget>[
+        MaterialButton(
+          onPressed: () => Navigator.of(context).pop(),
+          child: Text(tr("Cancel").toUpperCase()),
+        ),
+        MaterialButton(
+          onPressed: _canSubmit ? _checkPassword : null,
+          child: Text(tr("Submit").toUpperCase()),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildContent() {
+    if (_status == _Status.CHECKING)
+      return IntrinsicHeight(
+        child: buildCenteredProgressBar(),
+      );
+
+    return TextField(
+      controller: _controller,
+      obscureText: true,
+      onChanged: (s) => _setStatus(_Status.NONE),
+      decoration: InputDecoration(
+        alignLabelWithHint: true,
+        labelText: tr("Your current password"),
+        errorText: _status == _Status.ERROR ? tr("Invalid password!") : null,
+      ),
+    );
+  }
+
+  void _checkPassword() async {
+    try {
+      _setStatus(_Status.CHECKING);
+
+      await SettingsHelper.checkUserPassword(_currPass);
+
+      Navigator.of(context).pop(_currPass);
+    } catch (e, stack) {
+      print("Could not validate user pasword! $e\n$stack");
+      _setStatus(_Status.ERROR);
+    }
+  }
+}

lib/ui/routes/account_settings/account_security_settings.dart

@@ -1,5 +1,7 @@
+import 'package:comunic/ui/dialogs/input_user_password_dialog.dart';
 import 'package:comunic/utils/intl_utils.dart';
 import 'package:flutter/material.dart';
+import 'package:settings_ui/settings_ui.dart';
 
 /// Account security settings
 ///
@@ -12,6 +14,38 @@ class AccountSecuritySettingsScreen extends StatelessWidget {
       appBar: AppBar(
         title: Text(tr("Security settings")),
       ),
+      body: _AccountSecuritySettingsScreenBody(),
     );
   }
 }
+
+class _AccountSecuritySettingsScreenBody extends StatefulWidget {
+  @override
+  __AccountSecuritySettingsScreenBodyState createState() =>
+      __AccountSecuritySettingsScreenBodyState();
+}
+
+class __AccountSecuritySettingsScreenBodyState
+    extends State<_AccountSecuritySettingsScreenBody> {
+  @override
+  Widget build(BuildContext context) {
+    return SettingsList(
+      sections: [
+        SettingsSection(
+          title: tr("Password"),
+          tiles: [
+            SettingsTile(
+              title: tr("Change password"),
+              onTap: _changePassword,
+            ),
+          ],
+        )
+      ],
+    );
+  }
+
+  /// Change current user password
+  void _changePassword() async {
+    final currPassword = await showUserPasswordDialog(context);
+  }
+}

lib/utils/input_utils.dart

@@ -2,6 +2,10 @@
 ///
 /// @author Pierre HUBERT
 
+/// Check out whether a password is valid or not
+bool validatePassword(String s) => s.length > 3;
+
+
 /// Check out whether a given email address is valid or not
 ///
 /// Taken from https://medium.com/@nitishk72/form-validation-in-flutter-d762fbc9212c