Add user sign up

lib/ui/setup_page.dart

@@ -13,14 +13,13 @@ class SetupPage extends StatefulWidget {
 }
 
 class _SetupPageState extends State<SetupPage> {
-  bool _hasFoundEndpoint = Configuration.instance.getEndpoint() != null;
   bool _errorFindingEndpoint = false;
   String _enteredEndpoint = "";
 
   @override
   Widget build(BuildContext context) {
-    _hasFoundEndpoint = Configuration.instance.getEndpoint() != null;
-    if (!_hasFoundEndpoint && !_errorFindingEndpoint) {
+    if (Configuration.instance.getEndpoint() == null &&
+        !_errorFindingEndpoint) {
       EndpointFinder.instance.findEndpoint().then((endpoint) {
         setState(() {
           Configuration.instance.setEndpoint(endpoint);
@@ -41,9 +40,11 @@ class _SetupPageState extends State<SetupPage> {
   }
 
   Widget _getBody() {
-    if (!_hasFoundEndpoint && !_errorFindingEndpoint) {
+    if (Configuration.instance.getEndpoint() == null &&
+        !_errorFindingEndpoint) {
       return _getSearchScreen();
-    } else if (!_hasFoundEndpoint && _errorFindingEndpoint) {
+    } else if (Configuration.instance.getEndpoint() == null &&
+        _errorFindingEndpoint) {
       return _getManualEndpointEntryScreen();
     } else {
       return SignInWidget(() {

lib/ui/sign_in_widget.dart

@@ -17,21 +17,31 @@ class SignInWidget extends StatefulWidget {
 }
 
 class _SignInWidgetState extends State<SignInWidget> {
-  String _username, _password;
+  String _username, _password, _repeatedPassword;
   @override
   void initState() {
-    _username = Configuration.instance.getUsername();
-    _password = Configuration.instance.getPassword();
     super.initState();
   }
 
   @override
   Widget build(BuildContext context) {
+    if (Configuration.instance.getToken() == null) {
+      // Has probably not signed up
+      return _getSignUpWidget(context);
+    } else {
+      return _getSignInWidget(context);
+    }
+  }
+
+  Widget _getSignUpWidget(BuildContext context) {
     return Container(
         child: Column(
       children: <Widget>[
+        Padding(
+          padding: const EdgeInsets.fromLTRB(0, 16, 0, 0),
+          child: Text("Create an account to get started"),
+        ),
         TextFormField(
-          initialValue: _username,
           decoration: InputDecoration(
             hintText: 'username',
             contentPadding: EdgeInsets.all(20),
@@ -45,7 +55,75 @@ class _SignInWidgetState extends State<SignInWidget> {
           },
         ),
         TextFormField(
-          initialValue: _password,
+          decoration: InputDecoration(
+            hintText: 'password',
+            contentPadding: EdgeInsets.all(20),
+          ),
+          autocorrect: false,
+          obscureText: true,
+          onChanged: (value) {
+            setState(() {
+              _password = value;
+            });
+          },
+        ),
+        TextFormField(
+          decoration: InputDecoration(
+            hintText: 'repeat password',
+            contentPadding: EdgeInsets.all(20),
+          ),
+          autocorrect: false,
+          obscureText: true,
+          onChanged: (value) {
+            setState(() {
+              _repeatedPassword = value;
+            });
+          },
+        ),
+        CupertinoButton(
+          child: Text("Sign Up"),
+          onPressed: () async {
+            if (_password != _repeatedPassword) {
+              _showPasswordMismatchDialog();
+            } else {
+              try {
+                final userCreated = await UserAuthenticator.instance
+                    .create(_username, _password);
+                if (userCreated) {
+                  Navigator.of(context).pop();
+                } else {
+                  _showGenericErrorDialog();
+                }
+              } catch (e) {
+                _showGenericErrorDialog(error: e);
+              }
+            }
+          },
+        ),
+      ],
+    ));
+  }
+
+  Widget _getSignInWidget(BuildContext context) {
+    return Container(
+        child: Column(
+      children: <Widget>[
+        TextFormField(
+          initialValue: Configuration.instance.getUsername(),
+          decoration: InputDecoration(
+            hintText: 'username',
+            contentPadding: EdgeInsets.all(20),
+          ),
+          autofocus: true,
+          autocorrect: false,
+          onChanged: (value) {
+            setState(() {
+              _username = value;
+            });
+          },
+        ),
+        TextFormField(
+          initialValue: Configuration.instance.getPassword(),
           decoration: InputDecoration(
             hintText: 'password',
             contentPadding: EdgeInsets.all(20),
@@ -66,7 +144,7 @@ class _SignInWidgetState extends State<SignInWidget> {
             if (loggedIn) {
               Navigator.of(context).pop();
             } else {
-              _showErrorDialog();
+              _showAuthenticationFailedErrorDialog();
             }
           },
         ),
@@ -74,7 +152,57 @@ class _SignInWidgetState extends State<SignInWidget> {
     ));
   }
 
-  void _showErrorDialog() {
+  void _showPasswordMismatchDialog() {
+    showDialog<void>(
+      context: context,
+      barrierDismissible: false, // user must tap button!
+      builder: (BuildContext context) {
+        return CupertinoAlertDialog(
+          title: Text("Passwords don't match"),
+          content: Padding(
+            padding: const EdgeInsets.fromLTRB(0, 16, 0, 0),
+            child: Text("Please make sure that the passwords you enter match."),
+          ),
+          actions: <Widget>[
+            CupertinoDialogAction(
+              child: Text('OK'),
+              onPressed: () {
+                Navigator.of(context).pop();
+              },
+            ),
+          ],
+        );
+      },
+    );
+  }
+
+  void _showGenericErrorDialog({Exception error}) {
+    showDialog<void>(
+      context: context,
+      barrierDismissible: false, // user must tap button!
+      builder: (BuildContext context) {
+        return CupertinoAlertDialog(
+          title: Text("Ooops."),
+          content: Padding(
+            padding: const EdgeInsets.fromLTRB(0, 16, 0, 0),
+            child: error == null
+                ? Text("Something went wrong.")
+                : Text(error.toString()),
+          ),
+          actions: <Widget>[
+            CupertinoDialogAction(
+              child: Text('OK'),
+              onPressed: () {
+                Navigator.of(context).pop();
+              },
+            ),
+          ],
+        );
+      },
+    );
+  }
+
+  void _showAuthenticationFailedErrorDialog() {
     showDialog<void>(
       context: context,
       barrierDismissible: false, // user must tap button!
@@ -82,7 +210,7 @@ class _SignInWidgetState extends State<SignInWidget> {
         return CupertinoAlertDialog(
           title: Text('Login failed'),
           content: Padding(
-            padding: const EdgeInsets.fromLTRB(0, 8, 0, 0),
+            padding: const EdgeInsets.fromLTRB(0, 16, 0, 0),
             child: Text(
                 'Please make sure that the credentials entered are correct.'),
           ),

lib/user_authenticator.dart

@@ -35,4 +35,30 @@ class UserAuthenticator {
       return false;
     });
   }
+
+  Future<bool> create(String username, String password) {
+    return _dio.post(
+        "http://" + Configuration.instance.getEndpoint() + ":8080/users/create",
+        queryParameters: {
+          "username": username,
+          "password": password
+        }).then((response) {
+      if (response.statusCode == 200 && response.data != null) {
+        Configuration.instance.setUsername(username);
+        Configuration.instance.setPassword(password);
+        Configuration.instance.setToken(response.data["token"]);
+        Bus.instance.fire(UserAuthenticatedEvent());
+        return true;
+      } else {
+        if (response.data != null && response.data["message"] != null) {
+          throw Exception(response.data["message"]);
+        } else {
+          throw Exception("Something went wrong");
+        }
+      }
+    }).catchError((e) {
+      _logger.e(e.toString());
+      throw e;
+    });
+  }
 }