Refactor mobile to use OpenApi generated SDK (#336)

mobile/openapi/lib/api_helper.dart

@@ -0,0 +1,110 @@
+//
+// AUTO-GENERATED FILE, DO NOT MODIFY!
+//
+// @dart=2.12
+
+// ignore_for_file: unused_element, unused_import
+// ignore_for_file: always_put_required_named_parameters_first
+// ignore_for_file: constant_identifier_names
+// ignore_for_file: lines_longer_than_80_chars
+
+part of openapi.api;
+
+class QueryParam {
+  const QueryParam(this.name, this.value);
+
+  final String name;
+  final String value;
+
+  @override
+  String toString() => '${Uri.encodeQueryComponent(name)}=${Uri.encodeQueryComponent(value)}';
+}
+
+// Ported from the Java version.
+Iterable<QueryParam> _queryParams(String collectionFormat, String name, dynamic value,) {
+  // Assertions to run in debug mode only.
+  assert(name.isNotEmpty, 'Parameter cannot be an empty string.');
+
+  final params = <QueryParam>[];
+
+  if (value is List) {
+    if (collectionFormat == 'multi') {
+      return value.map((dynamic v) => QueryParam(name, parameterToString(v)),);
+    }
+
+    // Default collection format is 'csv'.
+    if (collectionFormat.isEmpty) {
+      collectionFormat = 'csv'; // ignore: parameter_assignments
+    }
+
+    final delimiter = _delimiters[collectionFormat] ?? ',';
+
+    params.add(QueryParam(name, value.map<dynamic>(parameterToString).join(delimiter),));
+  } else if (value != null) {
+    params.add(QueryParam(name, parameterToString(value)));
+  }
+
+  return params;
+}
+
+/// Format the given parameter object into a [String].
+String parameterToString(dynamic value) {
+  if (value == null) {
+    return '';
+  }
+  if (value is DateTime) {
+    return value.toUtc().toIso8601String();
+  }
+  if (value is AssetTypeEnum) {
+    return AssetTypeEnumTypeTransformer().encode(value).toString();
+  }
+  if (value is DeleteAssetStatus) {
+    return DeleteAssetStatusTypeTransformer().encode(value).toString();
+  }
+  if (value is DeviceTypeEnum) {
+    return DeviceTypeEnumTypeTransformer().encode(value).toString();
+  }
+  return value.toString();
+}
+
+/// Returns the decoded body as UTF-8 if the given headers indicate an 'application/json'
+/// content type. Otherwise, returns the decoded body as decoded by dart:http package.
+Future<String> _decodeBodyBytes(Response response) async {
+  final contentType = response.headers['content-type'];
+  return contentType != null && contentType.toLowerCase().startsWith('application/json')
+    ? response.bodyBytes.isEmpty ? '' : utf8.decode(response.bodyBytes)
+    : response.body;
+}
+
+/// Returns a valid [T] value found at the specified Map [key], null otherwise.
+T? mapValueOfType<T>(dynamic map, String key) {
+  final dynamic value = map is Map ? map[key] : null;
+  return value is T ? value : null;
+}
+
+/// Returns a valid Map<K, V> found at the specified Map [key], null otherwise.
+Map<K, V>? mapCastOfType<K, V>(dynamic map, String key) {
+  final dynamic value = map is Map ? map[key] : null;
+  return value is Map ? value.cast<K, V>() : null;
+}
+
+/// Returns a valid [DateTime] found at the specified Map [key], null otherwise.
+DateTime? mapDateTime(dynamic map, String key, [String? pattern]) {
+  final dynamic value = map is Map ? map[key] : null;
+  if (value != null) {
+    int? millis;
+    if (value is int) {
+      millis = value;
+    } else if (value is String) {
+      if (pattern == _dateEpochMarker) {
+        millis = int.tryParse(value);
+      } else {
+        return DateTime.tryParse(value);
+      }
+    }
+    if (millis != null) {
+      return DateTime.fromMillisecondsSinceEpoch(millis, isUtc: true);
+    }
+  }
+  return null;
+}