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UploadVerifyHelper.cs
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125 lines (115 loc) · 3.74 KB
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/*
* 作用：验证上传文件格式。
* */
using System;
using System.Collections.Generic;
using System.IO;
using System.Web;
namespace Helper.Core.Library
{
#region 逻辑辅助枚举类
internal class VerifyFormat
{
public const string Jpg = ".jpg";
public const string Png = ".png";
public const string Gif = ".gif";
public const string Bmp = ".bmp";
private static List<string> formatList;
public static List<string> FormatList
{
get
{
if (formatList == null || formatList.Count == 0)
{
formatList = new List<string>()
{
Png,
Jpg,
Gif,
Bmp
};
}
return formatList;
}
}
}
#endregion
public class UploadVerifyHelper
{
#region 对外公开方法
/// <summary>
/// 验证上传文件是否合法
/// </summary>
/// <param name="httpPostedFile">HttpPostedFileBase</param>
/// <param name="suffixList">合法后缀列表，例：.rar</param>
/// <param name="serialEnumList">VerifyFormatSerialEnum</param>
/// <returns></returns>
public static bool Verify(HttpPostedFileBase httpPostedFile, List<string> suffixList, params VerifyFormatSerialEnum[] serialEnumList)
{
MemoryStream memoryStream = null;
BinaryReader binaryReader = null;
try
{
Stream stream = httpPostedFile.InputStream;
string suffix = FileHelper.GetSuffix(httpPostedFile.FileName);
if (suffixList.IndexOf(suffix) < 0) return false;
Byte[] bytesContent = new Byte[2];
stream.Read(bytesContent, 0, 2);
stream.Seek(0, SeekOrigin.Begin);
memoryStream = new MemoryStream(bytesContent);
binaryReader = new BinaryReader(memoryStream);
string bufferText = string.Empty;
byte buffer = byte.MinValue;
buffer = binaryReader.ReadByte();
bufferText = buffer.ToString();
buffer = binaryReader.ReadByte();
bufferText += buffer.ToString();
foreach (VerifyFormatSerialEnum formatSerialEnum in serialEnumList)
{
if (int.Parse(bufferText) == (int)formatSerialEnum) return true;
}
return false;
}
catch
{
throw;
}
finally
{
if (memoryStream != null) memoryStream.Dispose();
if (binaryReader != null) binaryReader.Dispose();
}
}
/// <summary>
/// 验证上传图片类型是否合法
/// </summary>
/// <param name="httpPostedFile">HttpPostedFileBase</param>
/// <returns></returns>
public static bool Verify(HttpPostedFileBase httpPostedFile)
{
return Verify(httpPostedFile, VerifyFormat.FormatList, VerifyFormatSerialEnum.Jpg, VerifyFormatSerialEnum.Gif, VerifyFormatSerialEnum.Png, VerifyFormatSerialEnum.Bmp);
}
#endregion
}
#region 逻辑处理辅助类
public enum VerifyFormatSerialEnum
{
None = 0,
Jpg = 255216,
Gif = 7173,
Bmp = 6677,
Png = 13780,
Swf = 6787,
Rar = 8297,
Zip = 8075,
Xml = 6063,
Doc = 208207,
Docx = 8075,
Aspx = 239187,
Cs = 117115,
Sql = 255254,
Html = 6063,
Exe = 7790
}
#endregion
}