80 lines
1.8 KiB
Dart
80 lines
1.8 KiB
Dart
import 'package:freezed_annotation/freezed_annotation.dart';
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import '../extensions/helpers_extension.dart';
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part 'channel_id.freezed.dart';
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/// Encapsulates a valid YouTube channel ID.
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@freezed
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class ChannelId with _$ChannelId {
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/// Initializes an instance of [ChannelId]
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factory ChannelId(String value) {
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final id = parseChannelId(value);
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if (id == null) {
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throw ArgumentError.value(value, 'value', 'Invalid channel id');
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}
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return ChannelId._internal(id);
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}
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const factory ChannelId._internal(
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/// ID as a string.
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String value) = _ChannelId;
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const ChannelId._();
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/// Converts [obj] to a [ChannelId] by calling .toString on that object.
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/// If it is already a [ChannelId], [obj] is returned
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factory ChannelId.fromString(dynamic obj) {
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if (obj is ChannelId) {
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return obj;
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}
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return ChannelId(obj.toString());
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}
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/* ChannelId(String value) : value = parseChannelId(value) ?? '' {
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if (this.value.isEmpty) {
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throw ArgumentError.value(value);
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}*/
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/// Returns true if the given id is a valid channel id.
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static bool validateChannelId(String id) {
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if (id.isNullOrWhiteSpace) {
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return false;
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}
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if (!id.startsWith('UC')) {
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return false;
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}
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if (id.length != 24) {
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return false;
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}
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return !RegExp(r'[^0-9a-zA-Z_\-]').hasMatch(id);
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}
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/// Parses a channel id from an url.
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/// Returns null if the username is not found.
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static String? parseChannelId(String url) {
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if (url.isEmpty) {
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return null;
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}
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if (validateChannelId(url)) {
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return url;
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}
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var regMatch = RegExp(r'youtube\..+?/channel/(.*?)(?:\?|&|/|$)')
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.firstMatch(url)
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?.group(1);
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if (!regMatch.isNullOrWhiteSpace && validateChannelId(regMatch!)) {
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return regMatch;
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}
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return null;
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}
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@override
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String toString() => value;
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}
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