59 lines
1.9 KiB
Dart
59 lines
1.9 KiB
Dart
/// Defensive JSON helpers for the Subsonic protocol.
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///
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/// Subsonic servers are inconsistent (Ratune handles the same quirks in
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/// `ratune-subsonic/src/models.rs` via `OneOrMany` / `deserialize_flexible_id`):
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/// * a field that is sometimes a single object and sometimes an array
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/// * IDs that are sometimes strings and sometimes integers
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/// Every accessor below tolerates nulls and mixed types rather than throwing.
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library;
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/// Coerce a value that may be a single object, a list, or null into a list of
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/// `T`, applying [fromJson] to each map element.
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List<T> oneOrMany<T>(
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dynamic value,
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T Function(Map<String, dynamic>) fromJson,
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) {
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if (value == null) return const [];
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if (value is List) {
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return value
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.whereType<Map>()
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.map((e) => fromJson(e.cast<String, dynamic>()))
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.toList();
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}
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if (value is Map) {
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return [fromJson(value.cast<String, dynamic>())];
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}
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return const [];
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}
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/// Read a string that the server might encode as an int (e.g. IDs).
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String? asString(dynamic value) {
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if (value == null) return null;
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if (value is String) return value;
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return value.toString();
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}
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/// Read an int from a value that might be an int, num, or numeric string.
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int? asInt(dynamic value) {
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if (value == null) return null;
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if (value is int) return value;
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if (value is num) return value.toInt();
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if (value is String) return int.tryParse(value);
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return null;
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}
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/// Read a double from an int/num/numeric-string.
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double? asDouble(dynamic value) {
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if (value == null) return null;
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if (value is double) return value;
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if (value is num) return value.toDouble();
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if (value is String) return double.tryParse(value);
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return null;
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}
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/// Read a bool that might arrive as a bool or the string "true"/"false".
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bool asBool(dynamic value, {bool orElse = false}) {
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if (value is bool) return value;
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if (value is String) return value.toLowerCase() == 'true';
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return orElse;
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}
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