feat(mobile): Auto switching server URLs (#14437)

mobile/lib/models/auth/auxilary_endpoint.model.dart

@@ -0,0 +1,105 @@
+// ignore_for_file: public_member_api_docs, sort_constructors_first
+import 'dart:convert';
+
+class AuxilaryEndpoint {
+  final String url;
+  final AuxCheckStatus status;
+
+  AuxilaryEndpoint({
+    required this.url,
+    required this.status,
+  });
+
+  AuxilaryEndpoint copyWith({
+    String? url,
+    AuxCheckStatus? status,
+  }) {
+    return AuxilaryEndpoint(
+      url: url ?? this.url,
+      status: status ?? this.status,
+    );
+  }
+
+  @override
+  String toString() => 'AuxilaryEndpoint(url: $url, status: $status)';
+
+  @override
+  bool operator ==(covariant AuxilaryEndpoint other) {
+    if (identical(this, other)) return true;
+
+    return other.url == url && other.status == status;
+  }
+
+  @override
+  int get hashCode => url.hashCode ^ status.hashCode;
+
+  Map<String, dynamic> toMap() {
+    return <String, dynamic>{
+      'url': url,
+      'status': status.toMap(),
+    };
+  }
+
+  factory AuxilaryEndpoint.fromMap(Map<String, dynamic> map) {
+    return AuxilaryEndpoint(
+      url: map['url'] as String,
+      status: AuxCheckStatus.fromMap(map['status'] as Map<String, dynamic>),
+    );
+  }
+
+  String toJson() => json.encode(toMap());
+
+  factory AuxilaryEndpoint.fromJson(String source) =>
+      AuxilaryEndpoint.fromMap(json.decode(source) as Map<String, dynamic>);
+}
+
+class AuxCheckStatus {
+  final String name;
+  AuxCheckStatus({
+    required this.name,
+  });
+  const AuxCheckStatus._(this.name);
+
+  static const loading = AuxCheckStatus._('loading');
+  static const valid = AuxCheckStatus._('valid');
+  static const error = AuxCheckStatus._('error');
+  static const unknown = AuxCheckStatus._('unknown');
+
+  @override
+  bool operator ==(covariant AuxCheckStatus other) {
+    if (identical(this, other)) return true;
+
+    return other.name == name;
+  }
+
+  @override
+  int get hashCode => name.hashCode;
+
+  AuxCheckStatus copyWith({
+    String? name,
+  }) {
+    return AuxCheckStatus(
+      name: name ?? this.name,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return <String, dynamic>{
+      'name': name,
+    };
+  }
+
+  factory AuxCheckStatus.fromMap(Map<String, dynamic> map) {
+    return AuxCheckStatus(
+      name: map['name'] as String,
+    );
+  }
+
+  String toJson() => json.encode(toMap());
+
+  factory AuxCheckStatus.fromJson(String source) =>
+      AuxCheckStatus.fromMap(json.decode(source) as Map<String, dynamic>);
+
+  @override
+  String toString() => 'AuxCheckStatus(name: $name)';
+}