using System;
using System.Configuration;
using System.Drawing;
using System.Drawing.Imaging;
using System.Globalization;
using System.IO;
using System.Text.RegularExpressions;
using System.Web;
using EW.EWorkpal.Core.Common.MongoProvider.MongoGridFSRepository.Models;
using EW.EWorkpal.Core.System;
using EW.EWorkpal.Services.FileManagerService.ImageProvider;
namespace EW.EWorkpal.Modules.Picture
{
public class PictureWebHandler : ServiceBase, IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
HttpResponse response =
context.Response;
HttpRequest request =
context.Request;
#region 客户端缓存
int clientCacheTime;
//客户端缓存时间（秒）
string clientCacheSecond = GetAppSetting(
"ClientCacheSecond",
true);
if (!
int.TryParse(clientCacheSecond,
out clientCacheTime))
clientCacheTime =
3600;
string clearHeadImage = request.Headers[
"Clear-HeadImage"];
if (!
string.IsNullOrEmpty(clearHeadImage))
{
ClearClientCaching(context.Response);
return;
}
string headerModified = request.Headers[
"If-Modified-Since"];
if (headerModified !=
null)
{
long nowTicks =
DateTime.Now.Ticks;
long modifiedTick = DateTime.Parse(request.Headers[
"If-Modified-Since"]).Ticks;
long ticks = nowTicks -
modifiedTick;
if (TimeSpan.FromTicks(ticks).Seconds <
clientCacheTime)
{
response.StatusCode =
304;
// 这种方式会产生“此操作要求使用 IIS 集成管线模式。 ”的异常
//Response.Headers.Add("Content-Encoding", "gzip");
// Response.Headers.Add 和 Response.AddHeader 但是在MSDN中明确写出，这些都是为了兼容ASP，在.NET 3.5要求使用下面这种方式。
//这种方式不会出现异常
response.AppendHeader(
"Content-Encoding",
"gzip");
response.StatusDescription =
"Not Madified";
response.End();
return;
}
}
#endregion
string regex = GetAppSetting(
"UrlRegex");
string sourceRegex = GetAppSetting(
"SourceUrlRegex");
string headRegex = GetAppSetting(
"HeadImageUrlRegex");
string comLogoRegex = GetAppSetting(
"ComLogoUrlRegex");
string url =
request.Url.AbsoluteUri;
int regexIndex;
if (Regex.IsMatch(url, headRegex, RegexOptions.IgnoreCase))
regexIndex =
3;
else if (Regex.IsMatch(url, comLogoRegex, RegexOptions.IgnoreCase))
regexIndex =
4;
else if (Regex.IsMatch(url, regex, RegexOptions.IgnoreCase))
regexIndex =
1;
else if (Regex.IsMatch(url, sourceRegex, RegexOptions.IgnoreCase))
regexIndex =
2;
else
regexIndex =
0;
if (regexIndex ==
0)
{
Error404(response);
return;
}
#region 用户头像
if (regexIndex ==
3)
{
var regResult = Regex.Match(url,
@"\d+/\d+").Value;
var str = regResult.Split(
'/');
if (str.Length <
2)
{
Error404(response);
return;
}
int id, size;
if (!
int.TryParse(str[
0],
out id))
{
Error404(response);
return;
}
if (!
int.TryParse(str[
1],
out size))
{
Error404(response);
return;
}
if (size ==
0)
{
size =
50;
}
else if (size ==
1)
{
size =
80;
}
else
{
size =
150;
}
var srcPicBytes = GetService<IImageService>
().GetHeadImage(id);
if (srcPicBytes !=
null)
{
Stream stream =
GetHighHeadImage(srcPicBytes, size);
long dataToRead =
stream.Length;
byte[] bytes =
((MemoryStream)stream).GetBuffer();
response.Buffer =
true;
response.ContentType =
"image/jpeg";
while (dataToRead >
0)
{
if (response.IsClientConnected)
{
int length =
bytes.Length;
byte[] buffer =
bytes;
response.OutputStream.Write(buffer, 0, length);
response.Flush();
dataToRead = dataToRead -
length;
}
else
{
dataToRead = -
1;
}
}
SetClientCaching(response, DateTime.Now, clientCacheTime);
}
else
{
//if (requesthost != picturehost)//盗链，返回提示图片
////{
//// context.Response.WriteFile("/Img/linknotice/ImageForbiden.jpg");
////}
context.Response.ClearContent();
context.Response.WriteFile("/img/headimg/noavatar_" + size +
"_" + size +
".jpg");
context.Response.ContentType =
"image/jpeg";
context.Response.End();
return;
}
// context.Response.ClearContent();
// context.Response.ContentType = "image/jpeg";
context.Response.End();
return;
}
#endregion
#region 企业Logo
if (regexIndex ==
4)
{
var regResult = Regex.Match(url,
@"ent/\d+").Value;
var str = regResult.Split(
'/');
if (str.Length <
2)
{
Error404(response);
return;
}
int size;
if (!
int.TryParse(str[
1],
out size))
{
Error404(response);
return;
}
if (size ==
0)
{
size =
50;
}
else if (size ==
1)
{
size =
100;
}
else
{
size =
150;
}
string fileName = regexIndex ==
1 ? Regex.Match(url, regex, RegexOptions.IgnoreCase).Groups[
1].Value : Regex.Match(url, sourceRegex, RegexOptions.IgnoreCase).Groups[
1].Value;
MongoFileInfo options;
var srcPicBytes = GetService<IImageService>().Get(fileName,
out options);
if (srcPicBytes !=
null)
{
Stream stream =
GetHighHeadImage(srcPicBytes, size);
long dataToRead =
stream.Length;
byte[] bytes =
((MemoryStream)stream).GetBuffer();
response.Buffer =
true;
response.ContentType =
"image/jpeg";
while (dataToRead >
0)
{
if (response.IsClientConnected)
{
int length =
bytes.Length;
byte[] buffer =
bytes;
response.OutputStream.Write(buffer, 0, length);
response.Flush();
dataToRead = dataToRead -
length;
}
else
{
dataToRead = -
1;
}
}
SetClientCaching(response, DateTime.Now, clientCacheTime);
}
else
{
context.Response.ClearContent();
context.Response.WriteFile(string.Format(
"/img/comlogo/{0}x{0}.jpg",size));
context.Response.ContentType =
"image/jpeg";
context.Response.End();
return;
}
// context.Response.ClearContent();
// context.Response.ContentType = "image/jpeg";
context.Response.End();
return;
}
#endregion
#region 读取原图
if (regexIndex ==
1 || regexIndex ==
2)
{
string fileName = regexIndex ==
1 ? Regex.Match(url, regex, RegexOptions.IgnoreCase).Groups[
1].Value : Regex.Match(url, sourceRegex, RegexOptions.IgnoreCase).Groups[
1].Value;
MongoFileInfo options;
var srcPicBytes = GetService<IImageService>().Get(fileName,
out options);
if (srcPicBytes ==
null || srcPicBytes.Length <=
0)
{
Error404(response);
return;
}
var srcPicStream =
new MemoryStream(srcPicBytes);
Image srcImage =
Image.FromStream(srcPicStream);
Image destImage =
null;
if (regexIndex ==
1)
{
int destWidth =
int.Parse(Regex.Match(url, regex, RegexOptions.IgnoreCase).Groups[
2].Value);
int destHeight =
int.Parse(Regex.Match(url, regex, RegexOptions.IgnoreCase).Groups[
3].Value);
string zoomType = Regex.Match(url, regex, RegexOptions.IgnoreCase).Groups[
4].Value;
bool zoomCut = zoomType.ToUpper() ==
"-C";
bool zoomFit = zoomType.ToUpper() ==
"-F";
//缩略
destImage =
ZoomPic.Zoom(srcImage,
new ZoomParam
{
Width =
destWidth,
Height =
destHeight,
Type =
zoomCut
?
EnumZoomType.Cut
: zoomFit ?
EnumZoomType.Fit : EnumZoomType.Cut
});
}
else
{
//返回原图
destImage =
srcImage;
}
#region 输出
Stream stream =
new MemoryStream();
try
{
if (destImage !=
null) destImage.Save(stream, ImageFormat.Jpeg);
long dataToRead =
stream.Length;
byte[] bytes =
((MemoryStream)stream).GetBuffer();
SetClientCaching(response, DateTime.Now, clientCacheTime);
response.Buffer =
true;
response.ContentType =
"image/jpeg";
while (dataToRead >
0)
{
if (response.IsClientConnected)
{
int length =
bytes.Length;
byte[] buffer =
bytes;
response.OutputStream.Write(buffer, 0, length);
response.Flush();
dataToRead = dataToRead -
length;
}
else
{
dataToRead = -
1;
}
}
}
catch (Exception e)
{
ClearClientCaching(response);
throw new Exception(e.Message);
}
finally
{
srcImage.Dispose();
srcPicStream.Dispose();
if (destImage !=
null) destImage.Dispose();
stream.Dispose();
}
#endregion
}
#endregion
}
#region private methods
private static string GetAppSetting(
string key,
bool allowNull =
false)
{
if (ConfigurationManager.AppSettings[key] ==
null)
{
if (allowNull)
return "";
throw new ConfigurationErrorsException(
string.Format(
"找不到appSettings配置，配置项{0}", key));
}
return ConfigurationManager.AppSettings[key];
}
private void SetClientCaching(HttpResponse response, DateTime lastModified,
int clientCacheTime)
{
response.ContentType =
"image/jpeg";
//将ETag Http标头设置为制定字符串
response.Cache.SetETag(lastModified.Ticks.ToString(CultureInfo.InvariantCulture));
//将Last_Modified Http标头设置为提供的System.DateTime值
response.Cache.SetLastModified(lastModified);
//将Cache-Control 标头设置为System.Web.HttpCacheability值之一
response.Cache.SetCacheability(HttpCacheability.Public);
//基于制定的时间跨度设置Cache-Control: max-age HTTP标头
response.Cache.SetMaxAge(
new TimeSpan(
0,
0,
0, clientCacheTime));
//将缓存过期从绝对时间设置为可调时间
response.Cache.SetSlidingExpiration(
true);
}
private void ClearClientCaching(HttpResponse response)
{
response.Cache.SetExpires(DateTime.Now);
}
private MemoryStream GetHeadImage(Byte[] file,
int size)
{
size = size >
150 ?
150 : size;
MemoryStream stream =
new MemoryStream(file);
Bitmap bmp =
new Bitmap(Image.FromStream(stream));
Image image = bmp.GetThumbnailImage(size, size,
null, IntPtr.Zero);
MemoryStream ms =
new MemoryStream();
image.Save(ms, ImageFormat.Jpeg);
return ms;
}
private MemoryStream GetHighHeadImage(Byte[] file,
int size)
{
MemoryStream ms =
new MemoryStream();
Image originalImage = Image.FromStream(
new MemoryStream(file));
//新建一个bmp图片
Image bitmap =
new Bitmap(size, size);
//新建一个画板
Graphics g =
Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode =
System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode =
System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空画布并以透明背景色填充
g.Clear(Color.Transparent);
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(originalImage,
new Rectangle(
0,
0, size, size),
new Rectangle(
0,
0, originalImage.Width, originalImage.Height), GraphicsUnit.Pixel);
try
{
//以jpg格式保存缩略图
bitmap.Save(ms, ImageFormat.Png);
}
catch (Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
return ms;
}
#endregion
/// <summary>
/// 返回404
/// </summary>
private static void Error404(HttpResponse response)
{
response.StatusCode =
404;
response.Flush();
response.End();
}
public bool IsReusable {
get {
return false; } }
}
}
转载于:https://www.cnblogs.com/kingCpp/p/4649144.html
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