Can sign in user

lib/models/api_request.dart

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+import 'package:meta/meta.dart';
+
+/// API Request model
+///
+/// Contains all the information associated to an API request
+///
+/// @author Pierre HUBERT
+
+class APIRequest {
+  final String uri;
+  final bool needLogin;
+  Map<String, String> args;
+
+  APIRequest({
+    @required this.uri,
+    this.needLogin = false,
+  })  : assert(uri != null),
+        assert(needLogin != null),
+        args = Map();
+
+  void addString(String name, String value) => args[name] = value;
+
+  void addInt(String name, int value) => args[name] = value.toString();
+
+  void addBool(String name, bool value) =>
+      args[name] = value ? "true" : "false";
+}

lib/models/api_response.dart

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+import 'dart:convert';
+
+/// API response
+///
+/// @author Pierre HUBERT
+
+class APIResponse {
+  final int code;
+  final String content;
+
+  const APIResponse(this.code, this.content) : assert(code != null);
+
+  List<dynamic> getArray() => jsonDecode(this.content);
+
+  Map<String, dynamic> getObject() => jsonDecode(this.content);
+}

lib/models/authentication_details.dart

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+import 'package:meta/meta.dart';
+
+/// Authentication details
+///
+/// @author Pierre HUBERT
+
+class AuthenticationDetails {
+  final String email;
+  final String password;
+
+  const AuthenticationDetails({@required this.email, @required this.password})
+      : assert(email != null),
+        assert(password != null);
+}

lib/models/config.dart

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+import 'package:meta/meta.dart';
+
+/// Application configuration model
+///
+/// @author Pierre HUBERT
+
+/// Configuration class
+class Config {
+  final String apiServerName;
+  final String apiServerUri;
+  final bool apiServerSecure;
+  final String serviceName;
+  final String serviceToken;
+
+  const Config(
+      {@required this.apiServerName,
+      @required this.apiServerUri,
+      @required this.apiServerSecure,
+      @required this.serviceName,
+      @required this.serviceToken})
+      : assert(apiServerName != null),
+        assert(apiServerUri != null),
+        assert(apiServerSecure != null),
+        assert(serviceName != null),
+        assert(serviceToken != null);
+
+  /// Get and set static configuration
+  static Config _config;
+
+  static Config get() {
+    return _config;
+  }
+
+  static void set(Config conf) {
+    _config = conf;
+  }
+}
+
+/// Get the current configuration of the application
+Config config() {
+  return Config.get();
+}

lib/models/login_tokens.dart

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+import 'dart:convert';
+
+/// Login tokens model
+///
+/// @author Pierre HUBERT
+
+class LoginTokens {
+  final String tokenOne;
+  final String tokenTwo;
+
+  const LoginTokens(this.tokenOne, this.tokenTwo)
+      : assert(tokenOne != null),
+        assert(tokenTwo != null);
+
+  LoginTokens.fromJSON(Map<String, dynamic> json)
+      : tokenOne = json["token_one"],
+        tokenTwo = json["token_two"];
+
+  @override
+  String toString() {
+    return jsonEncode({"token_one": tokenOne, "token_two": tokenTwo});
+  }
+}