ente/lib/ui/password_entry_page.dart

import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_markdown/flutter_markdown.dart';
import 'package:flutter_password_strength/flutter_password_strength.dart';
import 'package:photos/core/network.dart';
import 'package:photos/services/user_service.dart';
import 'package:photos/ui/common_elements.dart';
import 'package:photos/ui/loading_widget.dart';
import 'package:photos/ui/subscription_page.dart';
import 'package:photos/ui/web_page.dart';
import 'package:photos/utils/dialog_util.dart';

class PasswordEntryPage extends StatefulWidget {
  final bool isUpdatePassword;

  PasswordEntryPage({this.isUpdatePassword = false, Key key}) : super(key: key);

  @override
  _PasswordEntryPageState createState() => _PasswordEntryPageState();
}

class _PasswordEntryPageState extends State<PasswordEntryPage> {
  static const kPasswordStrengthThreshold = 0.4;

  final _passwordController1 = TextEditingController(),
      _passwordController2 = TextEditingController();
  double _passwordStrength = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.isUpdatePassword
            ? "change password"
            : "encryption password"),
      ),
      body: _getBody(),
    );
  }

  Widget _getBody() {
    return Column(
      children: [
        FlutterPasswordStrength(
          password: _passwordController1.text,
          backgroundColor: Colors.grey[850],
          strengthCallback: (strength) {
            _passwordStrength = strength;
          },
        ),
        SingleChildScrollView(
          child: Container(
            padding: EdgeInsets.fromLTRB(16, 36, 16, 16),
            child: Column(
              children: [
                // Image.asset(
                //   "assets/vault.png",
                //   width: 196,
                //   height: 196,
                // ),
                Padding(padding: EdgeInsets.all(12)),
                Text(
                  "enter a password we can use to encrypt your data",
                  textAlign: TextAlign.center,
                  style: TextStyle(
                    height: 1.3,
                  ),
                ),
                Padding(padding: EdgeInsets.all(8)),
                Text("we don't store this password, so if you forget, "),
                Text.rich(
                  TextSpan(
                      text: "we cannot decrypt your data",
                      style: TextStyle(
                        decoration: TextDecoration.underline,
                        fontWeight: FontWeight.bold,
                      )),
                  style: TextStyle(
                    height: 1.3,
                  ),
                  textAlign: TextAlign.center,
                ),
                Padding(padding: EdgeInsets.all(12)),
                Padding(
                  padding: const EdgeInsets.fromLTRB(32, 0, 32, 0),
                  child: TextFormField(
                    decoration: InputDecoration(
                      hintText: "password",
                      contentPadding: EdgeInsets.all(20),
                    ),
                    controller: _passwordController1,
                    autofocus: false,
                    autocorrect: false,
                    keyboardType: TextInputType.visiblePassword,
                    onChanged: (_) {
                      setState(() {});
                    },
                  ),
                ),
                Padding(padding: EdgeInsets.all(8)),
                Padding(
                  padding: const EdgeInsets.fromLTRB(32, 0, 32, 0),
                  child: TextFormField(
                    decoration: InputDecoration(
                      hintText: "password again",
                      contentPadding: EdgeInsets.all(20),
                    ),
                    controller: _passwordController2,
                    autofocus: false,
                    autocorrect: false,
                    obscureText: true,
                    keyboardType: TextInputType.visiblePassword,
                    onChanged: (_) {
                      setState(() {});
                    },
                  ),
                ),
                Padding(padding: EdgeInsets.all(20)),
                Container(
                  width: double.infinity,
                  height: 64,
                  padding: EdgeInsets.fromLTRB(40, 0, 40, 0),
                  child: button(
                    widget.isUpdatePassword
                        ? "change password"
                        : "set password",
                    fontSize: 18,
                    onPressed: _passwordController1.text.isNotEmpty &&
                            _passwordController2.text.isNotEmpty
                        ? () {
                            if (_passwordController1.text !=
                                _passwordController2.text) {
                              showErrorDialog(context, "uhm...",
                                  "the passwords you entered don't match");
                            } else if (_passwordStrength <
                                kPasswordStrengthThreshold) {
                              showErrorDialog(context, "weak password",
                                  "the password you have chosen is too simple, please choose another one");
                            } else {
                              _showPasswordConfirmationDialog();
                            }
                          }
                        : null,
                  ),
                ),
              ],
            ),
          ),
        ),
        Expanded(child: Container()),
        GestureDetector(
          behavior: HitTestBehavior.translucent,
          onTap: () {
            Navigator.of(context).push(
              MaterialPageRoute(
                builder: (BuildContext context) {
                  return WebPage("how it works", "https://ente.io/encryption");
                },
              ),
            );
          },
          child: Container(
            padding: EdgeInsets.all(40),
            child: RichText(
              text: TextSpan(
                text: "how it works",
                style: TextStyle(
                  color: Colors.blue,
                  fontFamily: 'Ubuntu',
                ),
              ),
            ),
          ),
        ),
      ],
    );
  }

  void _showPasswordConfirmationDialog() {
    AlertDialog alert = AlertDialog(
      title: Text("confirmation"),
      content: SingleChildScrollView(
        child: Column(children: [
          Text("the password you are promising to never forget is"),
          Padding(padding: EdgeInsets.all(8)),
          Text(_passwordController1.text,
              style: TextStyle(
                fontWeight: FontWeight.bold,
                fontSize: 28,
              )),
        ]),
      ),
      actions: [
        FlatButton(
          child: Text("change"),
          onPressed: () {
            Navigator.of(context, rootNavigator: true).pop();
          },
        ),
        FlatButton(
          child: Text("confirm"),
          onPressed: () {
            Navigator.of(context, rootNavigator: true).pop();
            if (widget.isUpdatePassword) {
              UserService.instance
                  .updateKeyAttributes(context, _passwordController1.text);
            } else {
              UserService.instance
                  .setupAttributes(context, _passwordController1.text);
            }
          },
        ),
      ],
    );

    showDialog(
      context: context,
      builder: (BuildContext context) {
        return alert;
      },
    );
  }
}