96 lines
2.7 KiB
Dart
96 lines
2.7 KiB
Dart
import 'package:freezed_annotation/freezed_annotation.dart';
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import '../extensions/helpers_extension.dart';
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part 'video_id.freezed.dart';
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/// Encapsulates a valid YouTube video ID.
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@freezed
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class VideoId with _$VideoId {
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static final _regMatchExp = RegExp(r'youtube\..+?/watch.*?v=(.*?)(?:&|/|$)');
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static final _shortMatchExp = RegExp(r'youtu\.be/(.*?)(?:\?|&|/|$)');
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static final _embedMatchExp = RegExp(r'youtube\..+?/embed/(.*?)(?:\?|&|/|$)');
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static final _shortsMatchExp =
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RegExp(r'youtube\..+/shorts/([A-Za-z0-9-_]+$)');
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/// Initializes an instance of [VideoId] with a url or video id.
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factory VideoId(String idOrUrl) {
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final id = parseVideoId(idOrUrl);
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if (id == null) {
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throw ArgumentError.value(
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idOrUrl, 'urlOrUrl', 'Invalid YouTube video ID or URL');
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}
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return VideoId._internal(id);
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}
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const VideoId._();
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const factory VideoId._internal(
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/// ID as string.
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String value) = _VideoId;
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/// Converts [obj] to a [VideoId] by calling .toString on that object.
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/// If it is already a [VideoId], [obj] is returned
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factory VideoId.fromString(dynamic obj) {
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if (obj is VideoId) {
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return obj;
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}
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return VideoId(obj.toString());
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}
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@override
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String toString() => value;
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/// Returns true if the given [videoId] is valid.
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static bool validateVideoId(String videoId) {
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if (videoId.isNullOrWhiteSpace) {
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return false;
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}
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if (videoId.length != 11) {
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return false;
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}
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return !RegExp(r'[^0-9a-zA-Z_\-]').hasMatch(videoId);
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}
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/// Parses a video id from url or if given a valid id as url returns itself.
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/// Returns null if the id couldn't be extracted.
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static String? parseVideoId(String url) {
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if (url.isNullOrWhiteSpace) {
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return null;
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}
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if (validateVideoId(url)) {
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return url;
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}
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// http://127.0.0.1:8080/www.youtube.com:443/watch?v=yIVRs6YSbOM
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var regMatch = _regMatchExp.firstMatch(url)?.group(1);
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if (!regMatch.isNullOrWhiteSpace && validateVideoId(regMatch!)) {
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return regMatch;
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}
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// https://youtu.be/yIVRs6YSbOM
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var shortMatch = _shortMatchExp.firstMatch(url)?.group(1);
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if (!shortMatch.isNullOrWhiteSpace && validateVideoId(shortMatch!)) {
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return shortMatch;
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}
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// http://127.0.0.1:8080/www.youtube.com:443/embed/yIVRs6YSbOM
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var embedMatch = _embedMatchExp.firstMatch(url)?.group(1);
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if (!embedMatch.isNullOrWhiteSpace && validateVideoId(embedMatch!)) {
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return embedMatch;
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}
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// http://127.0.0.1:8080/www.youtube.com:443/shorts/yIVRs6YSbOM
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var shortsMatch = _shortsMatchExp.firstMatch(url)?.group(1);
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if (!shortsMatch.isNullOrWhiteSpace && validateVideoId(shortsMatch!)) {
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return shortsMatch;
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}
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return null;
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}
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}
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