TweetDuck/lib/TweetLib.Core/Features/Twitter/TwitterUrls.cs

using System;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.Text.RegularExpressions;
using TweetLib.Utils.Static;

namespace TweetLib.Core.Features.Twitter {
	[SuppressMessage("ReSharper", "MemberCanBeInternal")]
	public static class TwitterUrls {
		public const string TweetDeck = "https://tweetdeck.twitter.com";
		private const string TwitterTrackingUrl = "t.co";

		public static Regex RegexAccount { get; } = new (@"^https?://twitter\.com/(?!signup$|tos$|privacy$|search$|search-)([^/?]+)/?$");

		public static bool IsTweetDeck(string url) {
			return url.Contains("://tweetdeck.twitter.com/");
		}

		public static bool IsTwitter(string url) {
			return url.Contains("://twitter.com/") || url.Contains("://mobile.twitter.com/");
		}

		public static bool IsTwitterLogin2Factor(string url) {
			return url.Contains("://twitter.com/account/login_verification") || url.Contains("://mobile.twitter.com/account/login_verification");
		}

		public static bool IsAllowedPopupUrl(string url) {
			return url.StartsWithOrdinal("https://twitter.com/teams/authorize?") ||
			       url.StartsWithOrdinal("https://accounts.google.com/") ||
			       url.StartsWithOrdinal("https://appleid.apple.com/");
		}

		public static string? GetFileNameFromUrl(string url) {
			return StringUtils.NullIfEmpty(Path.GetFileName(new Uri(url).AbsolutePath));
		}

		public static string GetMediaLink(string url, ImageQuality quality) {
			return ImageUrl.TryParse(url, out var obj) ? obj.WithQuality(quality) : url;
		}

		public static string? GetImageFileName(string url) {
			return GetFileNameFromUrl(ImageUrl.TryParse(url, out var obj) ? obj.WithNoQuality : url);
		}

		public enum UrlType {
			Invalid,
			Tracking,
			Fine
		}

		public static UrlType Check(string url) {
			if (url.Contains('"')) {
				return UrlType.Invalid;
			}

			if (Uri.TryCreate(url, UriKind.Absolute, out var uri)) {
				string scheme = uri.Scheme;

				if (scheme == Uri.UriSchemeHttps || scheme == Uri.UriSchemeHttp || scheme == Uri.UriSchemeFtp || scheme == Uri.UriSchemeMailto) {
					return uri.Host == TwitterTrackingUrl ? UrlType.Tracking : UrlType.Fine;
				}
			}

			return UrlType.Invalid;
		}
	}
}