Load server configuration

moneymgr_mobile/lib/services/api/server_api.dart

@@ -0,0 +1,72 @@
+// ignore_for_file: non_constant_identifier_names
+
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:logging/logging.dart';
+import 'package:moneymgr_mobile/services/storage/prefs.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+import 'api_client.dart';
+
+part 'server_api.freezed.dart';
+part 'server_api.g.dart';
+
+@freezed
+abstract class ServerConstraint with _$ServerConstraint {
+  const factory ServerConstraint({required int min, required int max}) =
+      _ServerConstraint;
+
+  factory ServerConstraint.fromJson(Map<String, dynamic> json) =>
+      _$ServerConstraintFromJson(json);
+}
+
+@freezed
+abstract class ServerConstraints with _$ServerConstraints {
+  const factory ServerConstraints({required ServerConstraint inbox_entry_label}) =
+  _ServerConstraints;
+
+  factory ServerConstraints.fromJson(Map<String, dynamic> json) =>
+      _$ServerConstraintsFromJson(json);
+}
+
+@freezed
+abstract class ServerConfig with _$ServerConfig {
+  const factory ServerConfig({required ServerConstraints constraints}) =
+      _ServerConfig;
+
+  factory ServerConfig.fromJson(Map<String, dynamic> json) =>
+      _$ServerConfigFromJson(json);
+}
+
+/// Auth API
+extension ServerApi on ApiClient {
+  /// Get authentication information from server
+  Future<ServerConfig> serverConfig() async {
+    final response = await execute("/server/config", method: "GET");
+    return ServerConfig.fromJson(response.data);
+  }
+
+
+}
+
+/// Get authentication information from server, or retrieve cached information (if available, in
+/// case of failure)
+@riverpod
+Future<ServerConfig> serverConfigOrCache(Ref ref) async {
+  final client = ref.watch(apiServiceProvider)!;
+  try {
+    final config = await client.serverConfig();
+    client.prefs.setServerConfig(config);
+    return config;
+  } catch (e, s) {
+    Logger.root.warning("Failed to fetch server configuration! $e $s");
+  }
+
+  final cached = client.prefs.serverConfig();
+  if (cached == null) {
+    throw Exception(
+      "Could not fetch server configuration, cached version is unavailable!",
+    );
+  }
+  return cached;
+}