Implement token-based login method and update localization for token prompts

lib/api.dart

@@ -2,32 +2,31 @@ import "dart:async";
 import "dart:convert";
 import "dart:io";
 
+import "package:cached_network_image/cached_network_image.dart";
 import "package:flutter/foundation.dart";
+import "package:flutter/material.dart";
+import "package:flutter_cache_manager/flutter_cache_manager.dart";
+import "package:flutter_tabler_icons/flutter_tabler_icons.dart";
 import "package:http/http.dart" as http;
 import "package:http/io_client.dart";
 import "package:intl/intl.dart";
-import "package:inventree/main.dart";
-import "package:inventree/widget/progress.dart";
-import "package:one_context/one_context.dart";
-import "package:open_filex/open_filex.dart";
-import "package:cached_network_image/cached_network_image.dart";
-import "package:flutter/material.dart";
-import "package:flutter_tabler_icons/flutter_tabler_icons.dart";
-import "package:flutter_cache_manager/flutter_cache_manager.dart";
-import "package:path_provider/path_provider.dart";
-
 import "package:inventree/api_form.dart";
 import "package:inventree/app_colors.dart";
-import "package:inventree/preferences.dart";
-import "package:inventree/l10.dart";
 import "package:inventree/helpers.dart";
 import "package:inventree/inventree/model.dart";
 import "package:inventree/inventree/notification.dart";
-import "package:inventree/inventree/status_codes.dart";
 import "package:inventree/inventree/sentry.dart";
+import "package:inventree/inventree/status_codes.dart";
+import "package:inventree/l10.dart";
+import "package:inventree/main.dart";
+import "package:inventree/preferences.dart";
 import "package:inventree/user_profile.dart";
 import "package:inventree/widget/dialogs.dart";
+import "package:inventree/widget/progress.dart";
 import "package:inventree/widget/snacks.dart";
+import "package:one_context/one_context.dart";
+import "package:open_filex/open_filex.dart";
+import "package:path_provider/path_provider.dart";
 
 /*
  * Class representing an API response from the server
@@ -163,6 +162,7 @@ class InvenTreeFileService extends FileService {
  *
  * InvenTree implements token-based authentication, which is
  * initialised using a username:password combination.
+ * Alternatively, an existing token provided by the user can be used for authentication.
  */
 
 /*
@@ -540,6 +540,35 @@ class InvenTreeAPI {
     }
   }
 
+  Future<APIResponse> checkToken(UserProfile userProfile, String token) async {
+    debug("Checking token @ ${_URL_ME}");
+
+    userProfile.token = token;
+    profile = userProfile;
+
+    await UserProfileDBManager().updateProfile(userProfile);
+
+    final response = await get(_URL_ME);
+
+    if (!response.successful()) {
+      switch (response.statusCode) {
+        case 401:
+        case 403:
+          showServerError(
+            apiUrl,
+            L10().serverAuthenticationError,
+            L10().invalidToken,
+          );
+        default:
+          showStatusCodeError(apiUrl, response.statusCode);
+      }
+
+      debug("Request failed: STATUS ${response.statusCode}");
+    }
+
+    return response;
+  }
+
   /*
    * Fetch a token from the server,
    * with a temporary authentication header

lib/l10n/app_en.arb

@@ -418,6 +418,9 @@
   "enterPassword": "Enter password",
   "@enterPassword": {},
   
+  "enterToken": "Enter API token",
+  "@enterToken": {},
+
   "enterUsername": "Enter username",
   "@enterUsername": {},
 
@@ -665,6 +668,9 @@
   "invalidSupplierPart": "Invalid Supplier Part",
   "@invalidSupplierPart": {},
   
+  "invalidToken": "Invalid Token",
+  "@invalidToken": {},
+
   "invalidUsernamePassword": "Invalid username / password combination",
   "@invalidUsernamePassword": {},
 
@@ -770,6 +776,9 @@
   "login": "Login",
   "@login": {},
   
+  "loginMethod": "Login method",
+  "@loginMethod": {},
+
   "loginEnter": "Enter login details",
   "@loginEnter": {},
 
@@ -1644,6 +1653,12 @@
   "toggleTorch": "Toggle Torch",
   "@toggleTorch": {},
   
+  "token": "Token",
+  "@token": {},
+  
+  "tokenEmpty": "Token cannot be empty",
+  "@tokenEmpty": {},
+
   "tokenError": "Token Error",
   "@tokenError": {},
 
@@ -1720,6 +1735,9 @@
   "username": "Username",
   "@username": {},
   
+  "usernameAndPassword": "Username & Password",
+  "@usernameAndPassword": {},
+
   "usernameEmpty": "Username cannot be empty",
   "@usernameEmpty": {},
 

lib/settings/login.dart

@@ -1,13 +1,14 @@
 import "package:flutter/material.dart";
 import "package:flutter_tabler_icons/flutter_tabler_icons.dart";
-
-import "package:inventree/app_colors.dart";
-import "package:inventree/user_profile.dart";
-import "package:inventree/l10.dart";
 import "package:inventree/api.dart";
+import "package:inventree/app_colors.dart";
+import "package:inventree/l10.dart";
+import "package:inventree/user_profile.dart";
 import "package:inventree/widget/dialogs.dart";
 import "package:inventree/widget/progress.dart";
 
+enum LoginMethod { credentials, token }
+
 class InvenTreeLoginWidget extends StatefulWidget {
   const InvenTreeLoginWidget(this.profile) : super();
 
@@ -22,9 +23,12 @@ class _InvenTreeLoginState extends State<InvenTreeLoginWidget> {
 
   String username = "";
   String password = "";
+  String token = "";
 
   bool _obscured = true;
 
+  LoginMethod _method = LoginMethod.credentials;
+
   String error = "";
 
   // Attempt login
@@ -44,12 +48,19 @@ class _InvenTreeLoginState extends State<InvenTreeLoginWidget> {
 
       showLoadingOverlay();
 
+      final APIResponse response;
+
+      if (_method == LoginMethod.credentials) {
         // Attempt login
-      final response = await InvenTreeAPI().fetchToken(
+        response = await InvenTreeAPI().fetchToken(
           widget.profile,
           username,
           password,
         );
+      } else {
+        // Check token validity
+        response = await InvenTreeAPI().checkToken(widget.profile, token);
+      }
 
       hideLoadingOverlay();
 
@@ -123,6 +134,35 @@ class _InvenTreeLoginState extends State<InvenTreeLoginWidget> {
             crossAxisAlignment: CrossAxisAlignment.start,
             children: [
               ...before,
+              // Dropdown to select login method
+              Padding(
+                padding: EdgeInsets.symmetric(vertical: 8),
+                child: DropdownButtonFormField<LoginMethod>(
+                  value: _method,
+                  decoration: InputDecoration(
+                    labelText: L10().loginMethod,
+                    labelStyle: TextStyle(fontWeight: FontWeight.bold),
+                  ),
+                  items: [
+                    DropdownMenuItem(
+                      child: Text(L10().usernameAndPassword),
+                      value: LoginMethod.credentials,
+                    ),
+                    DropdownMenuItem(
+                      child: Text(L10().token),
+                      value: LoginMethod.token,
+                    ),
+                  ],
+                  onChanged: (val) {
+                    setState(() {
+                      _method = val ?? LoginMethod.credentials;
+                    });
+                  },
+                ),
+              ),
+
+              // Show fields depending on selected login method
+              if (_method == LoginMethod.credentials) ...[
                 TextFormField(
                   decoration: InputDecoration(
                     labelText: L10().username,
@@ -172,6 +212,38 @@ class _InvenTreeLoginState extends State<InvenTreeLoginWidget> {
                     return null;
                   },
                 ),
+              ] else ...[
+                TextFormField(
+                  decoration: InputDecoration(
+                    labelText: L10().token,
+                    labelStyle: TextStyle(fontWeight: FontWeight.bold),
+                    hintText: L10().enterToken,
+                    suffixIcon: IconButton(
+                      icon: _obscured
+                          ? Icon(TablerIcons.eye)
+                          : Icon(TablerIcons.eye_off),
+                      onPressed: () {
+                        setState(() {
+                          _obscured = !_obscured;
+                        });
+                      },
+                    ),
+                  ),
+                  initialValue: "",
+                  keyboardType: TextInputType.visiblePassword,
+                  obscureText: _obscured,
+                  onSaved: (value) {
+                    token = value?.trim() ?? "";
+                  },
+                  validator: (value) {
+                    if (value == null || value.trim().isEmpty) {
+                      return L10().tokenEmpty;
+                    }
+
+                    return null;
+                  },
+                ),
+              ],
               ...after,
             ],
           ),