login: Restore saved url and email if available

lib/home_page.dart

@@ -30,7 +30,7 @@ class _MyHomePageState extends State<MyHomePage> {
   Future<List<Sheet>> acquireSheets() async {
     final url = await _storageHelper.readSecure(SecureStorageKey.url);
     final jwt = await _storageHelper.readSecure(SecureStorageKey.jwt);
-    apiClient = ApiClient(baseUrl: url!, token: jwt);
+    apiClient = ApiClient(baseUrl: "${url!}/api", token: jwt);
     // TODO: check if really logged in
     final sheets = await apiClient!.fetchSheets();
     log.info("${sheets.length} sheets fetched");

lib/login_page.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:jwt_decoder/jwt_decoder.dart';
+import 'package:logging/logging.dart';
 import 'package:sheetless/api.dart';
 import 'package:sheetless/home_page.dart';
 import 'package:sheetless/storage_helper.dart';
@@ -12,6 +13,8 @@ class LoginPage extends StatefulWidget {
 }
 
 class _LoginPageState extends State<LoginPage> {
+  final log = Logger("_LoginPageState");
+
   final TextEditingController _urlController = TextEditingController(
     text: "https://sheetable.julian-mutter.de",
   );
@@ -27,30 +30,26 @@ class _LoginPageState extends State<LoginPage> {
   @override
   void initState() {
     super.initState();
-    _checkJwtValidity();
+    _restoreStoredValues();
   }
 
-  Future<void> _checkJwtValidity() async {
+  Future<void> _restoreStoredValues() async {
     final jwt = await _storageHelper.readSecure(SecureStorageKey.jwt);
-    if (jwt != null) {
-      final isValid = await _validateJwt(jwt);
-      if (isValid) {
-        _navigateToMainPage();
+    if (jwt != null && await _isJwtValid(jwt)) {
+      await _navigateToMainPage();
       return;
-      } else {
+    }
     final url = await _storageHelper.readSecure(SecureStorageKey.url);
     final email = await _storageHelper.readSecure(SecureStorageKey.email);
-        final password = await _storageHelper.readSecure(
-          SecureStorageKey.password,
-        );
-        if (url != null && email != null && password != null) {
-          _login(url, email, password);
-        }
+    if (url != null) {
+      _urlController.text = url;
     }
+    if (email != null) {
+      _emailController.text = email;
     }
   }
 
-  Future<bool> _validateJwt(String jwt) async {
+  Future<bool> _isJwtValid(String jwt) async {
     try {
       bool expired = JwtDecoder.isExpired(jwt);
       return !expired;
@@ -63,15 +62,13 @@ class _LoginPageState extends State<LoginPage> {
     setState(() {
       _error = null;
     });
-    serverUrl = "$serverUrl/api";
-    final apiClient = ApiClient(baseUrl: serverUrl);
+    final apiClient = ApiClient(baseUrl: "$serverUrl/api");
     final loginResult = await apiClient.login(email, password);
     if (loginResult.isOk()) {
       await _storageHelper.writeSecure(SecureStorageKey.url, serverUrl);
       await _storageHelper.writeSecure(SecureStorageKey.jwt, apiClient.token!);
       await _storageHelper.writeSecure(SecureStorageKey.email, email);
-      await _storageHelper.writeSecure(SecureStorageKey.password, password);
-      _navigateToMainPage();
+      await _navigateToMainPage();
     } else {
       setState(() {
         _error = "Login failed.\n${loginResult.error()}";
@@ -127,7 +124,6 @@ class _LoginPageState extends State<LoginPage> {
               TextFormField(
                 controller: _emailController,
                 validator: validateNotEmpty,
-                autofocus: true,
                 decoration: InputDecoration(labelText: 'Email'),
                 textInputAction: TextInputAction.next,
               ),

lib/storage_helper.dart

@@ -1,7 +1,7 @@
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:hive/hive.dart';
 
-enum SecureStorageKey { url, jwt, email, password }
+enum SecureStorageKey { url, jwt, email }
 
 enum ConfigKey { twoPageMode }