Add API class

- Secure token based on username/password

lib/api.dart

@@ -0,0 +1,72 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:path/path.dart' as path;
+import 'package:http/http.dart' as http;
+
+
+class InventreeAPI {
+
+  InventreeAPI(this._username, this._password) {
+    _secureToken();
+  }
+
+  // Base URL for InvenTree API
+  String _base_url = "http://10.0.0.7:8000/api/";
+
+  String _username = "";
+  String _password = "";
+
+  // Authentication token (initially empty, must be requested)
+  String _token = "";
+
+  // Construct an API URL
+  String _makeUrl(String url) {
+    return path.join(_base_url, url);
+  }
+
+  bool _hasToken() {
+    return _token.isNotEmpty;
+  }
+
+  // Request an API token from the server.
+  // A valid username/password combination must be provided
+  void _secureToken() async {
+    _token = "";
+
+    var _url = _makeUrl("user/token/");
+    final response = await http.post(_url,
+        body: {
+          "username": _username,
+          "password": _password
+      });
+
+    if (response.statusCode != 200) {
+      print("Invalid status code:" + String.fromCharCode(response.statusCode));
+    } else {
+      var _json = json.decode(response.body);
+
+      if (_json["token"] != null) {
+        _token = _json["token"];
+        print("Received token: " + _token);
+      }
+    }
+  }
+
+  Future<http.Response> get(String url) async {
+    var _url = _makeUrl(url);
+    final response = await http.get(_url,
+      headers: {
+          HttpHeaders.authorizationHeader: "Token: " + _token
+        }
+    );
+
+    print("Making request to " + _url);
+    print(response.statusCode);
+    print(response.body);
+
+    return response;
+  }
+
+}

lib/main.dart

@@ -1,5 +1,8 @@
 import 'package:flutter/material.dart';
 
+import 'settings.dart';
+import 'api.dart';
+
 void main() => runApp(MyApp());
 
 class MyApp extends StatelessWidget {
@@ -57,6 +60,10 @@ class _MyHomePageState extends State<MyHomePage> {
     });
   }
 
+  void _login() {
+    Navigator.push(context, MaterialPageRoute(builder: (context) => InvenTreeSettingsWidget()));
+  }
+
   @override
   Widget build(BuildContext context) {
     // This method is rerun every time setState is called, for instance as done
@@ -89,8 +96,9 @@ class _MyHomePageState extends State<MyHomePage> {
               ),
               new Divider(),
               new ListTile(
-                title: new Text("Log In"),
-                leading: new Icon(Icons.security),
+                title: new Text("Settings"),
+                leading: new Icon(Icons.settings),
+                onTap: _login,
               ),
             ],
           )

lib/settings.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/material.dart';
+
+class InvenTreeSettingsWidget extends StatefulWidget {
+  // InvenTree settings view
+
+  @override
+  _InvenTreeSettingsState createState() => _InvenTreeSettingsState();
+
+}
+
+
+class _InvenTreeSettingsState extends State<InvenTreeSettingsWidget> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("InvenTree Settings"),
+      ),
+      body: Center(
+        child: ListView(
+          children: <Widget>[
+            ListTile(
+                title: Text("Server Settings"),
+                subtitle: Text("Configure server and login settings"),
+                onTap: _editServerSettings,
+            ),
+          ],
+        )
+      )
+    );
+  }
+
+  void _editServerSettings() {
+
+  }
+}

pubspec.lock

@@ -81,6 +81,20 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  http:
+    dependency: "direct main"
+    description:
+      name: http
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.12.0+2"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.1.3"
   image:
     dependency: transitive
     description:

pubspec.yaml

@@ -23,6 +23,7 @@ dependencies:
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^0.1.2
+  http: ^0.12.0+2
 
 dev_dependencies:
   flutter_test: