/// <summary>设置缓存策略（使用context.Response.Cache来缓存输出）</summary>
/// <remarks>
/// ashx 的页面缓存不允许写语句：<%@ OutputCache Duration="60" VaryByParam="*" %>
/// 故可直接调用本方法实现缓存。
/// 参考：https://stackoverflow.com/questions/1109768/how-to-use-output-caching-on-ashx-handler
/// </remarks>
public static void SetCachePolicy(this HttpResponse response, int cacheSeconds, string varyByParam = "*", HttpCacheability cacheLocation = HttpCacheability.ServerAndPrivate)
{
HttpCachePolicy cachePolicy = response.Cache;
if (cacheSeconds > 0)
{
cachePolicy.SetCacheability(cacheLocation);
cachePolicy.SetExpires(DateTime.Now.AddSeconds((double)cacheSeconds));
cachePolicy.SetSlidingExpiration(false);
cachePolicy.SetValidUntilExpires(true);
if (varyByParam.IsNotEmpty())
{
cachePolicy.VaryByParams[varyByParam] = true;
}
else
{
cachePolicy.VaryByParams.IgnoreParams = true;
}
}
else
{
cachePolicy.SetCacheability(HttpCacheability.NoCache);
cachePolicy.SetMaxAge(TimeSpan.Zero);
}
}
public void ProcessRequest(HttpContext context)
{
HttpRequest request = context.Request;
string physicalPath = request.PhysicalPath;
if (File.Exists(physicalPath))
{
string subfix = Path.GetExtension(physicalPath);
bool isOutputCache = false;
HttpResponse response = context.Response;
if (".png".Equals(subfix, StringComparison.CurrentCultureIgnoreCase))
{
isOutputCache = true;
response.ContentType = "image/x-png";
}
else if (".jpg".Equals(subfix, StringComparison.CurrentCultureIgnoreCase))
{
isOutputCache = true;
response.ContentType = "image/pjpeg";
}
if (isOutputCache)
{
const int DAYS = 30;
string ifModifiedSince = request.Headers["If-Modified-Since"];
if (!string.IsNullOrEmpty(ifModifiedSince) &&
TimeSpan.FromTicks(DateTime.Now.Ticks - DateTime.Parse(ifModifiedSince).Ticks).Days < DAYS)
{
response.StatusCode = (int)System.Net.HttpStatusCode.NotModified;
response.StatusDescription = "Not Modified";
response.End();
return;
}
else
{
HttpCachePolicy cache = response.Cache;
cache.SetLastModifiedFromFileDependencies();
cache.SetETagFromFileDependencies();
cache.SetCacheability(HttpCacheability.Public);
cache.SetExpires(DateTime.Now.AddDays(DAYS));
TimeSpan timeSpan = TimeSpan.FromDays(DAYS);
cache.SetMaxAge(timeSpan);
cache.SetProxyMaxAge(timeSpan);
cache.SetLastModified(context.Timestamp);
cache.SetValidUntilExpires(true);
cache.SetSlidingExpiration(true);
}
}
response.WriteFile(physicalPath);
response.End();
}
}
private void OnPreSendRequestHeaders(object sender, EdgeCacheEventArgs e)
{
EdgeCacheRule rule = (EdgeCacheRule)sender;
HttpContext context = e.Context;
int minutes = rule.Duration;
HttpResponse response = context.Response;
HttpCachePolicy policy = response.Cache;
policy.SetMaxAge(TimeSpan.FromMinutes(minutes));
policy.SetCacheability(HttpCacheability.ServerAndPrivate);
policy.SetSlidingExpiration(true);
}
/// <summary>
/// Sets cache expiration to from absolute to sliding.
/// </summary>
/// <param name="slide">true or false. </param>
public void SetSlidingExpiration(bool slide)
{
policy.SetSlidingExpiration(slide);
}
public override void SetSlidingExpiration(bool slide)
{
_httpCachePolicy.SetSlidingExpiration(slide);
}
/// <summary>
/// Sets the output cache policy for the specified domain operation entry.
/// </summary>
/// <param name="context">Current HttpContext</param>
/// <param name="domainOperationEntry">The domain operation entry we need to define the cache policy for.</param>
private static void SetOutputCachingPolicy(HttpContext context, DomainOperationEntry domainOperationEntry)
{
if (context == null)
{
return;
}
if (QueryOperationInvoker.SupportsCaching(context, domainOperationEntry))
{
OutputCacheAttribute outputCacheInfo = QueryOperationInvoker.GetOutputCacheInformation(domainOperationEntry);
if (outputCacheInfo != null)
{
HttpCachePolicy policy = context.Response.Cache;
if (outputCacheInfo.UseSlidingExpiration)
{
policy.SetSlidingExpiration(true);
policy.AddValidationCallback((HttpCacheValidateHandler) delegate(HttpContext c, object d, ref HttpValidationStatus status)
{
SlidingExpirationValidator validator = (SlidingExpirationValidator)d;
if (validator.IsValid())
{
status = HttpValidationStatus.Valid;
}
else
{
status = HttpValidationStatus.Invalid;
}
}, new SlidingExpirationValidator(outputCacheInfo.Duration));
}
if (outputCacheInfo.Duration > -1)
{
// When sliding expiration is set, ASP.NET will use the following to figure out the sliding expiration delta.
policy.SetExpires(DateTime.UtcNow.AddSeconds(outputCacheInfo.Duration));
policy.SetMaxAge(TimeSpan.FromSeconds(outputCacheInfo.Duration));
policy.SetValidUntilExpires(/* validUntilExpires */ true);
}
policy.SetCacheability(QueryOperationInvoker.GetCacheability(outputCacheInfo.Location));
if (!String.IsNullOrEmpty(outputCacheInfo.SqlCacheDependencies))
{
// Syntax is <databaseEntry>:<tableName>[;<databaseEntry>:<tableName>]*.
string[] dependencies = outputCacheInfo.SqlCacheDependencies.Split(QueryOperationInvoker.semiColonDelimiter, StringSplitOptions.RemoveEmptyEntries);
foreach (string dependency in dependencies)
{
string[] dependencyTokens = dependency.Split(QueryOperationInvoker.colonDelimiter, StringSplitOptions.RemoveEmptyEntries);
if (dependencyTokens.Length != 2)
{
throw new InvalidOperationException(Resource.DomainService_InvalidSqlDependencyFormat);
}
context.Response.AddCacheDependency(new SqlCacheDependency(dependencyTokens[0], dependencyTokens[1]));
}
}
if (!String.IsNullOrEmpty(outputCacheInfo.VaryByHeaders))
{
string[] headers = outputCacheInfo.VaryByHeaders.Split(QueryOperationInvoker.semiColonDelimiter, StringSplitOptions.RemoveEmptyEntries);
foreach (string header in headers)
{
policy.VaryByHeaders[header] = true;
}
}
// The cache is based on the values of the domain operation entry's parameters.
foreach (DomainOperationParameter pi in domainOperationEntry.Parameters)
{
policy.VaryByParams[pi.Name] = true;
}
// We don't cache when query parameters are used. We need to vary by query parameters
// though such that we can intercept requests with query parameters and by-pass the cache.
foreach (string queryParameter in supportedQueryParameters)
{
policy.VaryByParams[queryParameter] = true;
}
return;
}
}
// By default, don't let clients/proxies cache anything.
context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
}
public void Deny_Unrestricted()
{
HttpCachePolicy cache = response.Cache;
Assert.IsNotNull(cache.VaryByHeaders, "VaryByHeaders");
Assert.IsNotNull(cache.VaryByParams, "VaryByParams");
cache.AddValidationCallback(new HttpCacheValidateHandler(Validate), null);
cache.AppendCacheExtension("mono");
cache.SetCacheability(HttpCacheability.NoCache);
cache.SetCacheability(HttpCacheability.NoCache, "mono");
cache.SetETag("etag");
try
{
cache.SetETagFromFileDependencies();
}
catch (TypeInitializationException)
{
// 1.1 tries to initialize HttpRuntime
}
catch (InvalidOperationException)
{
// expected
}
cache.SetExpires(DateTime.MinValue);
cache.SetLastModified(DateTime.Now);
try
{
cache.SetLastModifiedFromFileDependencies();
}
catch (InvalidOperationException)
{
// expected
}
catch (NotImplementedException)
{
// mono
}
cache.SetMaxAge(TimeSpan.FromTicks(1000));
try
{
cache.SetNoServerCaching();
}
catch (NotImplementedException)
{
// mono
}
try
{
cache.SetNoStore();
}
catch (NotImplementedException)
{
// mono
}
try
{
cache.SetNoTransforms();
}
catch (NotImplementedException)
{
// mono
}
cache.SetProxyMaxAge(TimeSpan.FromTicks(2000));
cache.SetRevalidation(HttpCacheRevalidation.None);
cache.SetSlidingExpiration(true);
try
{
cache.SetValidUntilExpires(true);
}
catch (NotImplementedException)
{
// mono
}
cache.SetVaryByCustom("custom");
cache.SetAllowResponseInBrowserHistory(true);
#if NET_2_0
try
{
cache.SetOmitVaryStar(false);
}
catch (NotImplementedException)
{
// mono
}
#endif
}
/// <summary>
/// Configures ASP.Net's Cache policy based on properties set
/// </summary>
/// <param name="policy">cache policy to set</param>
void ICachePolicyConfigurer.Configure(HttpCachePolicy policy)
{
policy.SetAllowResponseInBrowserHistory(allowInHistory);
policy.SetCacheability(cacheability);
policy.SetOmitVaryStar(omitVaryStar);
policy.SetRevalidation(revalidation);
policy.SetSlidingExpiration(slidingExpiration);
policy.SetValidUntilExpires(validUntilExpires);
if (duration != 0)
{
policy.SetExpires(DateTime.Now.AddSeconds(duration));
}
if (varyByContentEncodings != null)
{
foreach (var header in varyByContentEncodings.Split(','))
{
policy.VaryByContentEncodings[header.Trim()] = true;
}
}
if (varyByCustom != null)
{
policy.SetVaryByCustom(varyByCustom);
}
if (varyByHeaders != null)
{
foreach (var header in varyByHeaders.Split(','))
{
policy.VaryByHeaders[header.Trim()] = true;
}
}
if (varyByParams != null)
{
foreach (var param in varyByParams.Split(','))
{
policy.VaryByParams[param.Trim()] = true;
}
}
if (cacheExtension != null)
{
policy.AppendCacheExtension(cacheExtension);
}
if (setEtagFromFileDependencies)
{
policy.SetETagFromFileDependencies();
}
if (setLastModifiedFromFileDependencies)
{
policy.SetLastModifiedFromFileDependencies();
}
if (setNoServerCaching)
{
policy.SetNoServerCaching();
}
if (setNoStore)
{
policy.SetNoStore();
}
if (setNoTransforms)
{
policy.SetNoTransforms();
}
if (etag != null)
{
policy.SetETag(etag);
}
if (isLastModifiedSet)
{
policy.SetLastModified(lastModified);
}
if (isMaxAgeSet)
{
policy.SetMaxAge(TimeSpan.FromSeconds(maxAge));
}
if (isProxyMaxAgeSet)
{
policy.SetProxyMaxAge(TimeSpan.FromSeconds(proxyMaxAge));
}
}
public override void SetSlidingExpiration(bool slide)
{
_policy.SetSlidingExpiration(slide);
}
public void ProcessRequest(HttpContext context)
{
HttpRequest request = context.Request;
string phyFilePath = request.PhysicalPath;
if (!File.Exists(phyFilePath))
{
string phyDirPath = Path.GetDirectoryName(phyFilePath);
if (!string.IsNullOrWhiteSpace(phyDirPath))
{
string fileName = Path.GetFileNameWithoutExtension(phyFilePath);
if (!string.IsNullOrWhiteSpace(fileName))
{
string fileExtension = Path.GetExtension(phyFilePath);
if (!string.IsNullOrWhiteSpace(fileExtension))
{
string[] fileNames = fileName.Split(new char[] { '_' }, StringSplitOptions.RemoveEmptyEntries);
if (fileNames != null)
{
int length = fileNames.Length;
if (length > 1)
{
fileName = string.Join("_", fileNames, 0, length - 1);
phyFilePath = Path.Combine(phyDirPath, string.Concat(fileName, fileExtension));
}
Array.Clear(fileNames, 0, length);
fileNames = null;
}
fileExtension = null;
}
fileName = null;
}
phyDirPath = null;
}
}
if (File.Exists(phyFilePath))
{
HttpResponse response = context.Response;
ECacheType cacheType = ECacheType.None;
string subfix = Path.GetExtension(phyFilePath);
if (".css".Equals(subfix, StringComparison.CurrentCultureIgnoreCase))
{
cacheType = ECacheType.Css;
response.ContentType = "text/css";
}
else if (".js".Equals(subfix, StringComparison.CurrentCultureIgnoreCase))
{
cacheType = ECacheType.Js;
response.ContentType = "application/x-javascript";
}
#if !DEBUG
if (cacheType != ECacheType.None)
{
//http://www.cnblogs.com/shanyou/archive/2012/05/01/2477500.html
const int DAYS = 30;
string ifModifiedSince = request.Headers["If-Modified-Since"];
if (!string.IsNullOrEmpty(ifModifiedSince) &&
TimeSpan.FromTicks(DateTime.Now.Ticks - DateTime.Parse(ifModifiedSince).Ticks).Days < DAYS)
{
response.StatusCode = (int)System.Net.HttpStatusCode.NotModified;
response.StatusDescription = "Not Modified";
response.End();
return;
}
else
{
string fileContent = null;
string ifNoneMatch = request.Headers["If-None-Match"];
string eTag = string.Format("\"{0}\"", this.GetFileMd5(string.Concat(phyFilePath, fileContent = this.GetFileContent(phyFilePath))));
if (!string.IsNullOrEmpty(ifNoneMatch) && ifNoneMatch.Equals(eTag))
{
response.StatusCode = (int)System.Net.HttpStatusCode.NotModified;
response.StatusDescription = "Not Modified";
response.End();
return;
}
else
{
HttpCachePolicy cache = response.Cache;
//cache.SetLastModifiedFromFileDependencies();//程序自动读取文件的LastModified
cache.SetLastModified(context.Timestamp); //因为静态文件的URL是特殊处理过，所以程序自动读取文件是在磁盘上找不到的，故改成手工代码设置文件的LastModified的方式。wangyunpeng，2016-4-12
//cache.SetETagFromFileDependencies();//程序自动读取文件的ETag
cache.SetETag(eTag); //因为静态文件的URL是特殊处理过，所以程序自动读取文件是在磁盘上找不到的，故改成手工代码设置文件的ETag的方式。wangyunpeng，2016-4-12
cache.SetCacheability(HttpCacheability.Public);
cache.SetExpires(DateTime.Now.AddDays(DAYS));
TimeSpan timeSpan = TimeSpan.FromDays(DAYS);
cache.SetMaxAge(timeSpan);
cache.SetProxyMaxAge(timeSpan);
cache.SetValidUntilExpires(true);
cache.SetSlidingExpiration(true);
#region 压缩js和css文件
if (!string.IsNullOrWhiteSpace(fileContent))
{
if (cacheType == ECacheType.Js)
{
string fileName = Path.GetFileName(phyFilePath);
if (_MiniJsFiles.Contains(fileName, new StringComparer()))
{
fileContent = this.PackJavascript(fileContent);//ECMAScript压缩
}
}
//输出内容
response.ContentEncoding = _GlobalizationSection == null ? Encoding.UTF8 : _GlobalizationSection.ResponseEncoding;
response.Write(fileContent);
}
#endregion
}
}
}
else
{//直接输出文件
response.WriteFile(phyFilePath);
}
#else
//直接输出文件
response.WriteFile(phyFilePath);
#endif
//取消GZIP压缩，IE7,IE8,Safari支持GZIP压缩显示css和js有问题。wangyunpeng
if (this.IsAcceptEncoding(request, GZIP))
{
response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);
this.SetResponseEncoding(response, GZIP);
}
else if (this.IsAcceptEncoding(request, DEFLATE))
{
response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);
this.SetResponseEncoding(response, DEFLATE);
}
response.End();
}
}
/// <summary>
/// 将文件内容输出到客户端客户端浏览器，支持http头操作。
/// </summary>
/// <param name="request"></param>
/// <param name="response"></param>
/// <param name="fileContent">要往客户端浏览器输出的文本内容</param>
/// <param name="isHttpHead">True表示使用http头操作，False表示不使用http头操作</param>
internal static void Output(HttpRequest request, HttpResponse response, string fileContent, string absoluteFilePath, bool isHttpHead)
{
if (string.IsNullOrWhiteSpace(fileContent))
{
return;
}
//wangyunpeng 增加http头，把生成的路径输出出来，方便修改页面使用。
if (absoluteFilePath != null)
{
response.AddHeader("X-Page-Hash", absoluteFilePath);
}
HttpCachePolicy cache = response.Cache;
cache.SetOmitVaryStar(true);//http://www.cnblogs.com/dudu/archive/2011/11/03/outputcache_Bug_vary.html
//#if DEBUG
//本地调试不使用浏览器缓存
//cache.SetCacheability(HttpCacheability.NoCache);
//cache.SetExpires(DateTime.UtcNow.AddYears(-1));
//cache.SetMaxAge(TimeSpan.Zero);
//cache.SetProxyMaxAge(TimeSpan.Zero);
//cache.SetNoServerCaching();
//cache.SetNoStore();
//cache.SetNoTransforms();
//#else
string ifModifiedSince = request.Headers["If-Modified-Since"];
if (isHttpHead)
{
if (
!string.IsNullOrWhiteSpace(ifModifiedSince) &&
TimeSpan.FromTicks(DateTime.Now.Ticks - TypeParseHelper.StrToDateTime(ifModifiedSince).Ticks).Minutes < CACHE_DATETIME)
{
response.StatusCode = (int)System.Net.HttpStatusCode.NotModified;
response.StatusDescription = "Not Modified";
response.End();
return;
}
else
{
cache.SetLastModifiedFromFileDependencies();
cache.SetETagFromFileDependencies();
cache.SetCacheability(HttpCacheability.Public);
cache.SetExpires(DateTime.UtcNow.AddMinutes(CACHE_DATETIME));
TimeSpan timeSpan = TimeSpan.FromMinutes(CACHE_DATETIME);
cache.SetMaxAge(timeSpan);
cache.SetProxyMaxAge(timeSpan);
cache.SetLastModified(DateTime.Now);
cache.SetValidUntilExpires(true);
cache.SetSlidingExpiration(true);
}
}
//#endif
System.Text.Encoding encoding = IOHelper.GetHtmEncoding(fileContent) ?? NVelocityBus._GlobalizationSection.ResponseEncoding;
response.ContentEncoding = encoding;
response.ContentType = response.ContentType;
response.Write(fileContent);
//压缩页面
if (request.ServerVariables["HTTP_X_MICROSOFTAJAX"] == null)
{
if (NVelocityBus.IsAcceptEncoding(request, GZIP))
{
response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);
NVelocityBus.SetResponseEncoding(response, GZIP);
}
else if (NVelocityBus.IsAcceptEncoding(request, DEFLATE))
{
response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);
NVelocityBus.SetResponseEncoding(response, DEFLATE);
}
}
//强制结束输出
response.End();
}