// Input validation utilities
/**
* Validates and parses YouTube URLs
*/
export class YouTubeURLValidator {
private static readonly VIDEO_PATTERNS = [
/^https?:\/\/(www\.|m\.)?youtube\.com\/watch\?v=([a-zA-Z0-9_-]{11})/,
/^https?:\/\/youtu\.be\/([a-zA-Z0-9_-]{11})/,
/^https?:\/\/(www\.|m\.)?youtube\.com\/embed\/([a-zA-Z0-9_-]{11})/,
/^https?:\/\/(www\.|m\.)?youtube\.com\/v\/([a-zA-Z0-9_-]{11})/,
];
private static readonly PLAYLIST_PATTERNS = [
/^https?:\/\/(www\.|m\.)?youtube\.com\/playlist\?list=([a-zA-Z0-9_-]+)/,
/^https?:\/\/(www\.|m\.)?youtube\.com\/watch\?v=[a-zA-Z0-9_-]{11}&list=([a-zA-Z0-9_-]+)/,
/[?&]list=([a-zA-Z0-9_-]+)/,
];
private static readonly CHANNEL_PATTERNS = [
/^https?:\/\/(www\.)?youtube\.com\/channel\/([a-zA-Z0-9_-]+)/,
/^https?:\/\/(www\.)?youtube\.com\/@([a-zA-Z0-9_-]+)/,
/^https?:\/\/(www\.)?youtube\.com\/c\/([a-zA-Z0-9_-]+)/,
/^https?:\/\/(www\.)?youtube\.com\/user\/([a-zA-Z0-9_-]+)/,
];
/**
* Validates if a string is a valid YouTube video URL
*/
static isValidVideoURL(url: string): boolean {
return this.VIDEO_PATTERNS.some((pattern) => pattern.test(url));
}
/**
* Extracts video ID from YouTube URL
*/
static extractVideoID(url: string): string | null {
for (const pattern of this.VIDEO_PATTERNS) {
const match = url.match(pattern);
if (match) {
return match[match.length - 1];
}
}
return null;
}
/**
* Validates if a string is a valid YouTube playlist URL
*/
static isValidPlaylistURL(url: string): boolean {
return this.PLAYLIST_PATTERNS.some((pattern) => pattern.test(url));
}
/**
* Extracts playlist ID from YouTube URL
*/
static extractPlaylistID(url: string): string | null {
for (const pattern of this.PLAYLIST_PATTERNS) {
const match = url.match(pattern);
if (match) {
return match[match.length - 1];
}
}
return null;
}
/**
* Validates if a string is a valid YouTube channel URL
*/
static isValidChannelURL(url: string): boolean {
return this.CHANNEL_PATTERNS.some((pattern) => pattern.test(url));
}
/**
* Extracts channel ID or handle from YouTube URL
*/
static extractChannelID(url: string): string | null {
for (const pattern of this.CHANNEL_PATTERNS) {
const match = url.match(pattern);
if (match) {
return match[match.length - 1];
}
}
return null;
}
}
