downkyi/DownKyi.Core/Storage/StorageCover.cs

using DownKyi.Core.Logging;
using DownKyi.Core.Storage.Database;
using DownKyi.Core.Utils.Encryptor;
using System;
using System.Drawing;
using System.IO;
using System.Windows.Media.Imaging;

namespace DownKyi.Core.Storage
{
    public class StorageCover
    {
        // 先判断本地有没有
        // 如果有
        // 则返回本地的图片路径
        // 如果没有
        // 则下载图片并返回本地的图片路径

        /// <summary>
        /// 获取封面缩略图
        /// </summary>
        /// <param name="avid"></param>
        /// <param name="bvid"></param>
        /// <param name="cid"></param>
        /// <param name="url"></param>
        /// <param name="width"></param>
        /// <param name="height"></param>
        /// <returns></returns>
        public BitmapImage GetCoverThumbnail(long avid, string bvid, long cid, string url, int width, int height)
        {
            string header = GetCover(avid, bvid, cid, url);

            return GetCoverThumbnail(header, width, height);
        }

        /// <summary>
        /// 获取封面缩略图
        /// </summary>
        /// <param name="cover"></param>
        /// <param name="width"></param>
        /// <param name="height"></param>
        /// <returns></returns>
        public BitmapImage GetCoverThumbnail(string cover, int width, int height)
        {
            if (cover == null) { return null; }

            Bitmap bitmap = new Bitmap(cover);
            Image thumbnail = bitmap.GetThumbnailImage(width, height, null, IntPtr.Zero);

            return StorageUtils.BitmapToBitmapImage(new Bitmap(thumbnail));
        }

        /// <summary>
        /// 获取封面
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public string GetCover(string url)
        {
            return GetCover(0, "", 0, url);
        }

        /// <summary>
        /// 获取封面
        /// </summary>
        /// <param name="aid"></param>
        /// <param name="bvid"></param>
        /// <param name="cid"></param>
        /// <param name="url"></param>
        /// <returns></returns>
        public string GetCover(long avid, string bvid, long cid, string url)
        {
            CoverDb coverDb = new CoverDb();
            Cover cover = coverDb.QueryByUrl(url);

            // 如果存在，直接返回
            // 如果不存在，则先下载
            if (cover != null)
            {
                string coverPath = $"{StorageManager.GetCover()}/{cover.Md5}";
                if (File.Exists(coverPath))
                {
                    Cover newCover = new Cover
                    {
                        Avid = avid,
                        Bvid = bvid,
                        Cid = cid,
                        Url = url,
                        Md5 = cover.Md5
                    };
                    coverDb.Update(newCover);

                    coverDb.Close();
                    return $"{StorageManager.GetCover()}/{cover.Md5}";
                }
                else
                {
                    string md5 = DownloadImage(url);
                    if (md5 != null)
                    {
                        Cover newCover = new Cover
                        {
                            Avid = avid,
                            Bvid = bvid,
                            Cid = cid,
                            Url = url,
                            Md5 = md5
                        };
                        coverDb.Update(newCover);

                        coverDb.Close();
                        return $"{StorageManager.GetCover()}/{md5}";
                    }
                    else
                    {
                        coverDb.Close();
                        return null;
                    }
                }
            }
            else
            {
                string md5 = DownloadImage(url);
                if (md5 != null)
                {
                    Cover newCover = new Cover
                    {
                        Avid = avid,
                        Bvid = bvid,
                        Cid = cid,
                        Url = url,
                        Md5 = md5
                    };
                    coverDb.Insert(newCover);

                    coverDb.Close();
                    return $"{StorageManager.GetCover()}/{md5}";
                }
                else
                {
                    coverDb.Close();
                    return null;
                }
            }
        }

        /// <summary>
        /// 下载图片
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        private string DownloadImage(string url)
        {
            string localFile = Path.GetTempPath() + Guid.NewGuid().ToString("N");

            // 下载
            bool isSuccessed = StorageUtils.DownloadImage(url, localFile);
            if (isSuccessed)
            {
                try
                {
                    string md5 = Hash.GetMD5HashFromFile(localFile);

                    if (File.Exists(localFile))
                    {
                        string destFile = $"{StorageManager.GetCover()}/{md5}";

                        try
                        {
                            File.Delete(destFile);
                        }
                        catch { }

                        // 移动到指定位置
                        File.Move(localFile, destFile);

                        return md5;
                    }
                    else
                    {
                        return null;
                    }
                }
                catch (Exception e)
                {
                    Utils.Debugging.Console.PrintLine("DownloadImage()发生异常: {0}", e);
                    LogManager.Error("StorageCover", e);
                    return null;
                }
            }

            return null;
        }

        /// <summary>
        /// 本地是否存在
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public bool IsLocal(CoverDb coverDb, string url)
        {
            Cover cover = coverDb.QueryByUrl(url);
            return cover != null;
        }

        /// <summary>
        /// 返回图片md5值
        /// </summary>
        /// <param name="coverDb"></param>
        /// <param name="url"></param>
        /// <returns></returns>
        public string LocalCover(CoverDb coverDb, string url)
        {
            Cover cover = coverDb.QueryByUrl(url);
            return cover.Md5;
        }

    }
}