freezer/lib/ui/login_screen.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:freezer/api/deezer.dart';
import 'package:freezer/api/player.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';
import 'package:freezer/translations.i18n.dart';

import '../settings.dart';
import '../api/definitions.dart';
import 'home_screen.dart';

class LoginWidget extends StatefulWidget {
  final Function callback;
  LoginWidget({this.callback, Key key}) : super(key: key);

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

class _LoginWidgetState extends State<LoginWidget> {
  String _arl;
  String _error;

  //Initialize deezer etc
  Future _init() async {
    deezerAPI.arl = settings.arl;
    await playerHelper.start();

    //Pre-cache homepage
    if (!await HomePage().exists()) {
      await deezerAPI.authorize();
      settings.offlineMode = false;
      HomePage hp = await deezerAPI.homePage();
      await hp.save();
    }
  }

  //Call _init()
  void _start() async {
    if (settings.arl != null) {
      _init().then((_) {
        if (widget.callback != null) widget.callback();
      });
    }
  }

  //Check if deezer available in current country
  void _checkAvailability() async {
    bool available = await DeezerAPI.chceckAvailability();
    if (!(available ?? true)) {
      showDialog(
          context: context,
          builder: (context) => AlertDialog(
                title: Text("Deezer is unavailable".i18n),
                content: Text(
                    "Deezer is unavailable in your country, Freezer might not work properly. Please use a VPN"
                        .i18n),
                actions: [
                  TextButton(
                    child: Text('Continue'.i18n),
                    onPressed: () => Navigator.of(context).pop(),
                  )
                ],
              ));
    }
  }

  @override
  void didUpdateWidget(LoginWidget oldWidget) {
    _start();
    super.didUpdateWidget(oldWidget);
  }

  @override
  void initState() {
    _start();
    _checkAvailability();
    super.initState();
  }

  void errorDialog() {
    showDialog(
        context: context,
        builder: (context) {
          return AlertDialog(
            title: Text('Error'.i18n),
            content: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                Text(
                    'Error logging in! Please check your token and internet connection and try again.'
                        .i18n),
                if (_error != null) Text('\n\n$_error')
              ],
            ),
            actions: <Widget>[
              TextButton(
                child: Text('Dismiss'.i18n),
                onPressed: () {
                  Navigator.of(context).pop();
                },
              )
            ],
          );
        });
  }

  void _update() async {
    setState(() => {});

    //Try logging in
    try {
      deezerAPI.arl = settings.arl;
      bool resp = await deezerAPI.rawAuthorize(
          onError: (e) => setState(() => _error = e.toString()));
      if (resp == false) {
        //false, not null
        if (settings.arl.length != 192) {
          if (_error == null) _error = '';
          _error += 'Invalid ARL length!';
        }
        setState(() => settings.arl = null);
        errorDialog();
      }
      //On error show dialog and reset to null
    } catch (e) {
      _error = e.toString();
      print('Login error: ' + e.toString());
      setState(() => settings.arl = null);
      errorDialog();
    }

    await settings.save();
    _start();
  }

  // ARL auth: called on "Save" click, Enter and DPAD_Center press
  void goARL(FocusNode node, TextEditingController _controller) {
    if (node != null) {
      node.unfocus();
    }
    _controller.clear();
    settings.arl = _arl.trim();
    Navigator.of(context).pop();
    _update();
  }

  @override
  Widget build(BuildContext context) {
    //If arl non null, show loading
    if (settings.arl != null)
      return Scaffold(
        body: Center(
          child: CircularProgressIndicator(),
        ),
      );
    TextEditingController _controller = new TextEditingController();
    // For "DPAD center" key handling on remote controls
    FocusNode focusNode = FocusNode(
        skipTraversal: true,
        descendantsAreFocusable: false,
        onKey: (node, event) {
          if (event.logicalKey == LogicalKeyboardKey.select) {
            goARL(node, _controller);
          }
          return true;
        });
    if (settings.arl == null)
      return Scaffold(
          body: Padding(
        padding: EdgeInsets.symmetric(vertical: 16.0, horizontal: 8.0),
        child: Theme(
          data: Theme.of(context).copyWith(
              outlinedButtonTheme: OutlinedButtonThemeData(
                  style: ButtonStyle(
                      foregroundColor:
                          MaterialStateProperty.all(Colors.white)))),
          //data: ThemeData(
          //    outlinedButtonTheme: OutlinedButtonThemeData(
          //        style: ButtonStyle(
          //            foregroundColor:
          //                MaterialStateProperty.all(Colors.white)))),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: <Widget>[
              Expanded(
                  child: Padding(
                      padding: EdgeInsets.symmetric(horizontal: 32.0),
                      child: Column(
                          mainAxisAlignment: MainAxisAlignment.center,
                          crossAxisAlignment: CrossAxisAlignment.stretch,
                          children: [
                            FreezerTitle(),
                            Container(height: 16.0),
                            Text(
                              "Please login using your Deezer account.".i18n,
                              textAlign: TextAlign.center,
                              style: TextStyle(fontSize: 16.0),
                            ),
                            Container(
                              height: 16.0,
                            ),
                            //Email login dialog
                            OutlinedButton(
                              child: Text(
                                'Login using email'.i18n,
                              ),
                              onPressed: () {
                                showDialog(
                                    context: context,
                                    builder: (context) => EmailLogin(_update));
                              },
                            ),
                            OutlinedButton(
                              child: Text('Login using browser'.i18n),
                              onPressed: () {
                                Navigator.of(context).push(MaterialPageRoute(
                                    builder: (context) =>
                                        LoginBrowser(_update)));
                              },
                            ),
                            OutlinedButton(
                              child: Text('Login using token'.i18n),
                              onPressed: () {
                                showDialog(
                                    context: context,
                                    builder: (context) {
                                      Future.delayed(
                                          Duration(seconds: 1),
                                          () => {
                                                focusNode.requestFocus()
                                              }); // autofocus doesn't work - it's replacement
                                      return AlertDialog(
                                        title: Text('Enter ARL'.i18n),
                                        content: Container(
                                          child: TextField(
                                            onChanged: (String s) => _arl = s,
                                            decoration: InputDecoration(
                                                labelText: 'Token (ARL)'.i18n),
                                            focusNode: focusNode,
                                            controller: _controller,
                                            onSubmitted: (String s) {
                                              goARL(focusNode, _controller);
                                            },
                                          ),
                                        ),
                                        actions: <Widget>[
                                          TextButton(
                                            child: Text('Save'.i18n),
                                            onPressed: () =>
                                                goARL(null, _controller),
                                          )
                                        ],
                                      );
                                    });
                              },
                            ),
                          ]))),
              Container(height: 16.0),
              Text(
                "If you don't have account, you can register on deezer.com for free."
                    .i18n,
                textAlign: TextAlign.center,
                style: TextStyle(fontSize: 16.0),
              ),
              Container(height: 8.0),
              Padding(
                padding: EdgeInsets.symmetric(horizontal: 32.0),
                child: OutlinedButton(
                  child: Text('Open in browser'.i18n),
                  onPressed: () {
                    InAppBrowser.openWithSystemBrowser(
                        url: 'https://deezer.com/register');
                  },
                ),
              ),
              Container(
                height: 8.0,
              ),
              Divider(),
              Container(
                height: 8.0,
              ),
              Text(
                "By using this app, you don't agree with the Deezer ToS".i18n,
                textAlign: TextAlign.center,
                style: TextStyle(fontSize: 14.0),
              )
            ],
          ),
        ),
      ));
    return null;
  }
}

class LoginBrowser extends StatelessWidget {
  final Function updateParent;
  LoginBrowser(this.updateParent);

  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        Expanded(
          child: Container(
            child: InAppWebView(
              initialUrl: 'https://deezer.com/login',
              onLoadStart:
                  (InAppWebViewController controller, String url) async {
                //Offers URL
                if (!url.contains('/login') && !url.contains('/register')) {
                  controller.evaluateJavascript(
                      source: 'window.location.href = "/open_app"');
                }

                //Parse arl from url
                if (url.startsWith('intent://deezer.page.link')) {
                  try {
                    //Parse url
                    Uri uri = Uri.parse(url);
                    //Actual url is in `link` query parameter
                    Uri linkUri = Uri.parse(uri.queryParameters['link']);
                    String arl = linkUri.queryParameters['arl'];
                    if (arl != null) {
                      settings.arl = arl;
                      Navigator.of(context).pop();
                      updateParent();
                    }
                  } catch (e) {}
                }
              },
            ),
          ),
        ),
      ],
    );
  }
}

class EmailLogin extends StatefulWidget {
  final Function callback;
  EmailLogin(this.callback, {Key key}) : super(key: key);

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

class _EmailLoginState extends State<EmailLogin> {
  String _email;
  String _password;
  bool _loading = false;

  Future _login() async {
    setState(() => _loading = true);
    //Try logging in
    String arl;
    String exception;
    try {
      arl = await DeezerAPI.getArlByEmail(_email, _password);
    } catch (e, st) {
      exception = e.toString();
      print(e);
      print(st);
    }
    setState(() => _loading = false);

    //Success
    if (arl != null) {
      settings.arl = arl;
      Navigator.of(context).pop();
      widget.callback();
      return;
    }

    //Error
    showDialog(
        context: context,
        builder: (context) => AlertDialog(
              title: Text("Error logging in!".i18n),
              content: Text(
                  "Error logging in using email, please check your credentials.\nError: " +
                      exception),
              actions: [
                TextButton(
                  child: Text('Dismiss'.i18n),
                  onPressed: () {
                    Navigator.of(context).pop();
                  },
                )
              ],
            ));
  }

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text('Email Login'.i18n),
      content: Column(
        mainAxisSize: MainAxisSize.min,
        children: _loading
            ? [CircularProgressIndicator()]
            : [
                TextField(
                  decoration: InputDecoration(labelText: 'Email'.i18n),
                  onChanged: (s) => _email = s,
                ),
                Container(
                  height: 8.0,
                ),
                TextField(
                  obscureText: true,
                  decoration: InputDecoration(labelText: "Password".i18n),
                  onChanged: (s) => _password = s,
                )
              ],
      ),
      actions: [
        if (!_loading)
          TextButton(
            child: Text('Login'),
            onPressed: () async {
              if (_email != null && _password != null)
                await _login();
              else
                Fluttertoast.showToast(
                    msg: "Missing email or password!".i18n,
                    gravity: ToastGravity.BOTTOM,
                    toastLength: Toast.LENGTH_SHORT);
            },
          )
      ],
    );
  }
}