downkyi/DownKyi.Core/BiliApi/BiliUtils/ParseEntrance.cs

using DownKyi.Core.Utils.Validator;
using System.Text.RegularExpressions;

namespace DownKyi.Core.BiliApi.BiliUtils
{
    /// <summary>
    /// 解析输入的字符串<para/>
    /// 支持的格式有：<para/>
    /// av号：av170001, AV170001, https://www.bilibili.com/video/av170001 <para/>
    /// BV号：BV17x411w7KC, https://www.bilibili.com/video/BV17x411w7KC <para/>
    /// 番剧（电影、电视剧）ss号：ss32982, SS32982, https://www.bilibili.com/bangumi/play/ss32982 <para/>
    /// 番剧（电影、电视剧）ep号：ep317925, EP317925, https://www.bilibili.com/bangumi/play/ep317925 <para/>
    /// 番剧（电影、电视剧）md号：md28228367, MD28228367, https://www.bilibili.com/bangumi/media/md28228367 <para/>
    /// 课程ss号：https://www.bilibili.com/cheese/play/ss205 <para/>
    /// 课程ep号：https://www.bilibili.com/cheese/play/ep3489 <para/>
    /// 收藏夹：ml1329019876, ML1329019876, https://www.bilibili.com/medialist/detail/ml1329019876 <para/>
    /// 用户空间：uid928123, UID928123, uid:928123, UID:928123, https://space.bilibili.com/928123
    /// </summary>
    public static class ParseEntrance
    {
        public static readonly string WwwUrl = "https://www.bilibili.com";
        public static readonly string ShareWwwUrl = "https://www.bilibili.com/s";
        public static readonly string ShortUrl = "https://b23.tv/";
        public static readonly string MobileUrl = "https://m.bilibili.com";

        public static readonly string SpaceUrl = "https://space.bilibili.com";

        public static readonly string VideoUrl = $"{WwwUrl}/video/";
        public static readonly string BangumiUrl = $"{WwwUrl}/bangumi/play/";
        public static readonly string BangumiMediaUrl = $"{WwwUrl}/bangumi/media/";
        public static readonly string CheeseUrl = $"{WwwUrl}/cheese/play/";
        public static readonly string FavoritesUrl = $"{WwwUrl}/medialist/detail/";

        #region 视频

        /// <summary>
        /// 是否为av id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsAvId(string input)
        {
            return IsIntId(input, "av");
        }

        /// <summary>
        /// 是否为av url
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsAvUrl(string input)
        {
            string id = GetVideoId(input);
            return IsAvId(id);
        }

        /// <summary>
        /// 获取av id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static long GetAvId(string input)
        {
            if (IsAvId(input))
            {
                return Number.GetInt(input.Remove(0, 2));
            }
            else if (IsAvUrl(input))
            {
                return Number.GetInt(GetVideoId(input).Remove(0, 2));
            }
            else
            {
                return -1;
            }
        }

        /// <summary>
        /// 是否为bv id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsBvId(string input)
        {
            return input.StartsWith("BV") && input.Length == 12;
        }

        /// <summary>
        /// 是否为bv url
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsBvUrl(string input)
        {
            string id = GetVideoId(input);
            return IsBvId(id);
        }

        /// <summary>
        /// 获取bv id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static string GetBvId(string input)
        {
            if (IsBvId(input))
            {
                return input;
            }
            else if (IsBvUrl(input))
            {
                return GetVideoId(input);
            }
            else
            {
                return "";
            }
        }

        #endregion

        #region 番剧（电影、电视剧）

        /// <summary>
        /// 是否为番剧season id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsBangumiSeasonId(string input)
        {
            return IsIntId(input, "ss");
        }

        /// <summary>
        /// 是否为番剧season url
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsBangumiSeasonUrl(string input)
        {
            string id = GetBangumiId(input);
            return IsBangumiSeasonId(id);
        }

        /// <summary>
        /// 获取番剧season id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static long GetBangumiSeasonId(string input)
        {
            if (IsBangumiSeasonId(input))
            {
                return Number.GetInt(input.Remove(0, 2));
            }
            else if (IsBangumiSeasonUrl(input))
            {
                return Number.GetInt(GetBangumiId(input).Remove(0, 2));
            }
            else
            {
                return -1;
            }
        }

        /// <summary>
        /// 是否为番剧episode id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsBangumiEpisodeId(string input)
        {
            return IsIntId(input, "ep");
        }

        /// <summary>
        /// 是否为番剧episode url
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsBangumiEpisodeUrl(string input)
        {
            string id = GetBangumiId(input);
            return IsBangumiEpisodeId(id);
        }

        /// <summary>
        /// 获取番剧episode id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static long GetBangumiEpisodeId(string input)
        {
            if (IsBangumiEpisodeId(input))
            {
                return Number.GetInt(input.Remove(0, 2));
            }
            else if (IsBangumiEpisodeUrl(input))
            {
                return Number.GetInt(GetBangumiId(input).Remove(0, 2));
            }
            else
            {
                return -1;
            }
        }

        /// <summary>
        /// 是否为番剧media id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsBangumiMediaId(string input)
        {
            return IsIntId(input, "md");
        }

        /// <summary>
        /// 是否为番剧media url
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsBangumiMediaUrl(string input)
        {
            string id = GetBangumiId(input);
            return IsBangumiMediaId(id);
        }

        /// <summary>
        /// 获取番剧media id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static long GetBangumiMediaId(string input)
        {
            if (IsBangumiMediaId(input))
            {
                return Number.GetInt(input.Remove(0, 2));
            }
            else if (IsBangumiMediaUrl(input))
            {
                return Number.GetInt(GetBangumiId(input).Remove(0, 2));
            }
            else
            {
                return -1;
            }
        }

        #endregion

        #region 课程

        /// <summary>
        /// 是否为课程season url
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsCheeseSeasonUrl(string input)
        {
            string id = GetCheeseId(input);
            return IsIntId(id, "ss");
        }

        /// <summary>
        /// 获取课程season id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static long GetCheeseSeasonId(string input)
        {
            return IsCheeseSeasonUrl(input) ? Number.GetInt(GetCheeseId(input).Remove(0, 2)) : -1;
        }

        /// <summary>
        /// 是否为课程episode url
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsCheeseEpisodeUrl(string input)
        {
            string id = GetCheeseId(input);
            return IsIntId(id, "ep");
        }

        /// <summary>
        /// 获取课程episode id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static long GetCheeseEpisodeId(string input)
        {
            return IsCheeseEpisodeUrl(input) ? Number.GetInt(GetCheeseId(input).Remove(0, 2)) : -1;
        }

        #endregion

        #region 收藏夹

        /// <summary>
        /// 是否为收藏夹id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsFavoritesId(string input)
        {
            return IsIntId(input, "ml");
        }

        /// <summary>
        /// 是否为收藏夹url
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsFavoritesUrl(string input)
        {
            string favoritesId = GetId(input, FavoritesUrl);
            return IsFavoritesId(favoritesId);
        }

        /// <summary>
        /// 获取收藏夹id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static long GetFavoritesId(string input)
        {
            if (IsFavoritesId(input))
            {
                return Number.GetInt(input.Remove(0, 2));
            }
            else if (IsFavoritesUrl(input))
            {
                return Number.GetInt(GetId(input, FavoritesUrl).Remove(0, 2));
            }
            else
            {
                return -1;
            }
        }

        #endregion

        #region 用户空间

        /// <summary>
        /// 是否为用户id
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsUserId(string input)
        {
            if (input.ToLower().StartsWith("uid:"))
            {
                return Regex.IsMatch(input.Remove(0, 4), @"^\d+$");
            }
            else if (input.ToLower().StartsWith("uid"))
            {
                return Regex.IsMatch(input.Remove(0, 3), @"^\d+$");
            }
            else { return false; }
        }

        /// <summary>
        /// 是否为用户空间url
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsUserUrl(string input)
        {
            string baseUrl = $"{SpaceUrl}/";
            string id = GetId(input, baseUrl);
            return Number.IsInt(id);
        }

        /// <summary>
        /// 获取用户mid
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static long GetUserId(string input)
        {
            if (input.ToLower().StartsWith("uid:"))
            {
                return Number.GetInt(input.Remove(0, 4));
            }
            else if (input.ToLower().StartsWith("uid"))
            {
                return Number.GetInt(input.Remove(0, 3));
            }
            else if (IsUserUrl(input))
            {
                string baseUrl = $"{SpaceUrl}/";
                string id = GetId(input, baseUrl);
                return Number.GetInt(id);
            }
            else
            {
                return -1;
            }
        }

        #endregion

        /// <summary>
        /// 是否为网址
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        private static bool IsUrl(string input)
        {
            return input.StartsWith("http://") || input.StartsWith("https://");
        }

        /// <summary>
        /// 将http转为https
        /// </summary>
        /// <returns></returns>
        private static string EnableHttps(string url)
        {
            if (!IsUrl(url)) { return null; }

            return url.Replace("http://", "https://");
        }

        /// <summary>
        /// 去除url中的参数
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        private static string DeleteUrlParam(string url)
        {
            string[] strList = url.Split('?');

            return strList[0].EndsWith("/") ? strList[0].TrimEnd('/') : strList[0];
        }

        /// <summary>
        /// 从url中获取视频id（avid/bvid）
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        private static string GetVideoId(string input)
        {
            return GetId(input, VideoUrl);
        }

        /// <summary>
        /// 从url中获取番剧id（ss/ep/md）
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        private static string GetBangumiId(string input)
        {
            string id = GetId(input, BangumiUrl);
            if (id != "") { return id; }
            return GetId(input, BangumiMediaUrl);
        }

        /// <summary>
        /// 从url中获取课程id（ss/ep）
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        private static string GetCheeseId(string input)
        {
            return GetId(input, CheeseUrl);
        }

        /// <summary>
        /// 是否为数字型id
        /// </summary>
        /// <param name="input"></param>
        /// <param name="prefix"></param>
        /// <returns></returns>
        private static bool IsIntId(string input, string prefix)
        {
            if (input.ToLower().StartsWith(prefix))
            {
                return Regex.IsMatch(input.Remove(0, 2), @"^\d+$");
            }
            return false;
        }

        /// <summary>
        /// 从url中获取id
        /// </summary>
        /// <param name="input"></param>
        /// <param name="baseUrl"></param>
        /// <returns></returns>
        private static string GetId(string input, string baseUrl)
        {
            if (!IsUrl(input)) { return ""; }

            string url = EnableHttps(input);
            url = DeleteUrlParam(url);

            url = url.Replace(ShareWwwUrl, WwwUrl);
            url = url.Replace(MobileUrl, WwwUrl);

            if (url.Contains("b23.tv/ss") || url.Contains("b23.tv/ep"))
            {
                url = url.Replace(ShortUrl, BangumiUrl);
            }
            else
            {
                url = url.Replace(ShortUrl, VideoUrl);
            }

            if (!url.StartsWith(baseUrl)) { return ""; }

            return url.Replace(baseUrl, "");
        }

    }
}