54 lines
1.2 KiB
Dart
54 lines
1.2 KiB
Dart
import 'package:equatable/equatable.dart';
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import '../extensions/helpers_extension.dart';
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/// Encapsulates a valid YouTube channel ID.
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class ChannelId extends Equatable {
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/// ID as a string.
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final String value;
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/// Initializes an instance of [ChannelId]
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ChannelId(String value)
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: value = parseChannelId(value) ??
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ArgumentError.value(value, 'value', 'Invalid 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('[^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.isNullOrWhiteSpace) {
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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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List<Object> get props => [value];
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}
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