feat: user login/logout with UserModel

Signed-off-by: Kingtous <kingtous@qq.com>

flutter/lib/models/user_model.dart

@@ -0,0 +1,83 @@
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+import 'package:http/http.dart' as http;
+
+import 'model.dart';
+
+class UserModel extends ChangeNotifier {
+  var userName = "".obs;
+  WeakReference<FFI> parent;
+
+  UserModel(this.parent);
+
+  Future<String> getUserName() async {
+    if (userName.isNotEmpty) {
+      return userName.value;
+    }
+    final userInfo =
+        await parent.target?.bind.mainGetLocalOption(key: 'user_info') ?? "{}";
+    if (userInfo.trim().isEmpty) {
+      return "";
+    }
+    final m = jsonDecode(userInfo);
+    userName.value = m['name'] ?? '';
+    return userName.value;
+  }
+
+  Future<void> logOut() async {
+    debugPrint("start logout");
+    final bind = parent.target?.bind;
+    if (bind == null) {
+      return;
+    }
+    final url = await bind.mainGetApiServer();
+    final _ = await http.post(Uri.parse("$url/api/logout"),
+        body: {
+          "id": await bind.mainGetMyId(),
+          "uuid": await bind.mainGetUuid(),
+        },
+        headers: await _getHeaders());
+    await Future.wait([
+      bind.mainSetLocalOption(key: 'access_token', value: ''),
+      bind.mainSetLocalOption(key: 'user_info', value: ''),
+      bind.mainSetLocalOption(key: 'selected-tags', value: ''),
+    ]);
+    parent.target?.abModel.clear();
+    userName.value = "";
+    notifyListeners();
+  }
+
+  Future<Map<String, String>>? _getHeaders() {
+    return parent.target?.getHttpHeaders();
+  }
+
+  Future<Map<String, dynamic>> login(String userName, String pass) async {
+    final bind = parent.target?.bind;
+    if (bind == null) {
+      return {"error": "no context"};
+    }
+    final url = await bind.mainGetApiServer();
+    try {
+      final resp = await http.post(Uri.parse("$url/api/login"),
+          headers: {"Content-Type": "application/json"},
+          body: jsonEncode({
+            "username": userName,
+            "password": pass,
+            "id": await bind.mainGetMyId(),
+            "uuid": await bind.mainGetUuid()
+          }));
+      final body = jsonDecode(resp.body);
+      bind.mainSetLocalOption(
+          key: "access_token", value: body['access_token'] ?? "");
+      bind.mainSetLocalOption(
+          key: "user_info", value: jsonEncode(body['user']));
+      this.userName.value = body['user']?['name'] ?? "";
+      return body;
+    } catch (err) {
+      return {"error": "$err"};
+    }
+  }
+}