public void OnResultExecuted(ResultExecutedContext filterContext) {
var response = filterContext.HttpContext.Response;
if (!_cacheControlStrategy.IsCacheable(filterContext.Result, response)) {
_filter = null;
if (_previousFilter != null) {
response.Filter = _previousFilter;
}
return;
}
// ignore error results from cache
if (response.StatusCode != (int)HttpStatusCode.OK) {
// Never cache non-200 responses.
filterContext.HttpContext.Response.Cache.SetCacheability(HttpCacheability.NoCache);
filterContext.HttpContext.Response.Cache.SetNoStore();
filterContext.HttpContext.Response.Cache.SetMaxAge(new TimeSpan(0));
_filter = null;
if (_previousFilter != null) {
response.Filter = _previousFilter;
}
return;
}
// if the result of a POST is a Redirect, remove any Cache Item for this url
// so that the redirected client gets a fresh result
// also add a random token to the query string so that public cachers (IIS, proxies, ...) don't return cached content
// i.e., Comment creation
// ignore in admin
if (AdminFilter.IsApplied(new RequestContext(filterContext.HttpContext, new RouteData()))) {
_filter = null;
if (_previousFilter != null) {
response.Filter = _previousFilter;
}
return;
}
_workContext = _workContextAccessor.GetContext();
// ignore authenticated requests
if (_workContext.CurrentUser != null) {
_filter = null;
if (_previousFilter != null) {
response.Filter = _previousFilter;
}
return;
}
// save the result only if the content can be intercepted
if (_filter == null) return;
// flush here to force the Filter to get the rendered content
if (response.IsClientConnected)
response.Flush();
var output = _filter.GetContents(response.ContentEncoding);
if (String.IsNullOrWhiteSpace(output)) {
return;
}
response.Filter = null;
response.Write(output);
// check if there is a specific rule not to cache the whole route
var configurations = _cacheService.GetRouteConfigurations();
var route = filterContext.Controller.ControllerContext.RouteData.Route;
var key = _cacheService.GetRouteDescriptorKey(filterContext.HttpContext, route);
var configuration = configurations.FirstOrDefault(c => c.RouteKey == key);
// do not cache ?
if (configuration != null && configuration.Duration == 0) {
return;
}
// don't cache the result of a POST redirection as it could contain notifications
if (_transformRedirect) {
return;
}
// don't cache the result if there were some notifications
var messagesZone = _workContextAccessor.GetContext(filterContext).Layout.Zones["Messages"];
var hasNotifications = messagesZone != null && ((IEnumerable<dynamic>)messagesZone).Any();
if (hasNotifications) {
return;
}
// default duration of specific one ?
var cacheDuration = configuration != null && configuration.Duration.HasValue ? configuration.Duration.Value : _cacheDuration;
if (cacheDuration <= 0) {
return;
}
// include each of the content item ids as tags for the cache entry
var contentItemIds = _displayedContentItemHandler.GetDisplayed().Select(x => x.ToString(CultureInfo.InvariantCulture)).ToArray();
if (filterContext.HttpContext.Request.Url == null) {
return;
}
_cacheItem.ContentType = response.ContentType;
_cacheItem.StatusCode = response.StatusCode;
_cacheItem.CachedOnUtc = _now;
_cacheItem.ValidFor = cacheDuration;
_cacheItem.QueryString = filterContext.HttpContext.Request.Url.Query;
_cacheItem.Output = output;
_cacheItem.CacheKey = _cacheKey;
_cacheItem.InvariantCacheKey = _invariantCacheKey;
_cacheItem.Tenant = _shellSettings.Name;
_cacheItem.Url = filterContext.HttpContext.Request.Url.AbsolutePath;
_cacheItem.Tags = new[] { _invariantCacheKey }.Union(contentItemIds).ToArray();
Logger.Debug("Cache item added: " + _cacheItem.CacheKey);
// remove old cache data
_cacheService.RemoveByTag(_invariantCacheKey);
// add data to cache
_cacheStorageProvider.Set(_cacheKey, _cacheItem);
// add to the tags index
foreach (var tag in _cacheItem.Tags) {
_tagCache.Tag(tag, _cacheKey);
}
}
public void OnActionExecuting(ActionExecutingContext filterContext) {
// apply OutputCacheAttribute logic if defined
var actionAttributes = filterContext.ActionDescriptor.GetCustomAttributes(typeof(OutputCacheAttribute), true);
var controllerAttributes = filterContext.ActionDescriptor.ControllerDescriptor.GetCustomAttributes(typeof(OutputCacheAttribute), true);
var outputCacheAttribute = actionAttributes.Concat(controllerAttributes).Cast<OutputCacheAttribute>().FirstOrDefault();
if (outputCacheAttribute != null) {
if (outputCacheAttribute.Duration <= 0 || outputCacheAttribute.NoStore) {
Logger.Debug("Request ignored based on OutputCache attribute");
return;
}
}
// saving the current datetime
_now = _clock.UtcNow;
// before executing an action, we check if a valid cached result is already
// existing for this context (url, theme, culture, tenant)
Logger.Debug("Request on: " + filterContext.RequestContext.HttpContext.Request.RawUrl);
// don't cache POST requests
if (filterContext.HttpContext.Request.HttpMethod.Equals("POST", StringComparison.OrdinalIgnoreCase)) {
Logger.Debug("Request ignored on POST");
return;
}
// don't cache the admin
if (AdminFilter.IsApplied(new RequestContext(filterContext.HttpContext, new RouteData()))) {
Logger.Debug("Request ignored on Admin section");
return;
}
// ignore child actions, e.g. HomeController is using RenderAction()
if (filterContext.IsChildAction) {
Logger.Debug("Request ignored on Child actions");
return;
}
_workContext = _workContextAccessor.GetContext();
// don't return any cached content, or cache any content, if the user is authenticated
if (_workContext.CurrentUser != null) {
Logger.Debug("Request ignored on Authenticated user");
return;
}
// caches the default cache duration to prevent a query to the settings
_cacheDuration = _cacheManager.Get("CacheSettingsPart.Duration",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return _workContext.CurrentSite.As<CacheSettingsPart>().DefaultCacheDuration;
}
);
// caches the default max age duration to prevent a query to the settings
_maxAge = _cacheManager.Get("CacheSettingsPart.MaxAge",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return _workContext.CurrentSite.As<CacheSettingsPart>().DefaultMaxAge;
}
);
_varyQueryStringParameters = _cacheManager.Get("CacheSettingsPart.VaryQueryStringParameters",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
var varyQueryStringParameters = _workContext.CurrentSite.As<CacheSettingsPart>().VaryQueryStringParameters;
return string.IsNullOrWhiteSpace(varyQueryStringParameters) ? null
: varyQueryStringParameters.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries).Select(s => s.Trim()).ToArray();
}
);
var varyRequestHeadersFromSettings = _cacheManager.Get("CacheSettingsPart.VaryRequestHeaders",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
var varyRequestHeaders = _workContext.CurrentSite.As<CacheSettingsPart>().VaryRequestHeaders;
return string.IsNullOrWhiteSpace(varyRequestHeaders) ? null
: varyRequestHeaders.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries).Select(s => s.Trim()).ToArray();
}
);
_varyRequestHeaders = (varyRequestHeadersFromSettings == null) ? new HashSet<string>() : new HashSet<string>(varyRequestHeadersFromSettings);
// different tenants with the same urls have different entries
_varyRequestHeaders.Add("HOST");
// Set the Vary: Accept-Encoding response header.
// This instructs the proxies to cache two versions of the resource: one compressed, and one uncompressed.
// The correct version of the resource is delivered based on the client request header.
// This is a good choice for applications that are singly homed and depend on public proxies for user locality.
_varyRequestHeaders.Add("Accept-Encoding");
// caches the ignored urls to prevent a query to the settings
_ignoredUrls = _cacheManager.Get("CacheSettingsPart.IgnoredUrls",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return _workContext.CurrentSite.As<CacheSettingsPart>().IgnoredUrls;
}
);
// caches the culture setting
_applyCulture = _cacheManager.Get("CacheSettingsPart.ApplyCulture",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return _workContext.CurrentSite.As<CacheSettingsPart>().ApplyCulture;
}
);
// caches the debug mode
_debugMode = _cacheManager.Get("CacheSettingsPart.DebugMode",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return _workContext.CurrentSite.As<CacheSettingsPart>().DebugMode;
}
);
// don't cache ignored url ?
if (IsIgnoredUrl(filterContext.RequestContext.HttpContext.Request.AppRelativeCurrentExecutionFilePath, _ignoredUrls)) {
return;
}
var queryString = filterContext.RequestContext.HttpContext.Request.QueryString;
var requestHeaders = filterContext.RequestContext.HttpContext.Request.Headers;
var parameters = new Dictionary<string, object>(filterContext.ActionParameters);
foreach (var key in queryString.AllKeys) {
if (key == null) continue;
parameters[key] = queryString[key];
}
foreach (var varyByRequestHeader in _varyRequestHeaders) {
if (requestHeaders.AllKeys.Contains(varyByRequestHeader)) {
parameters["HEADER:" + varyByRequestHeader] = requestHeaders[varyByRequestHeader];
}
}
// compute the cache key
_cacheKey = ComputeCacheKey(filterContext, parameters);
// create a tag which doesn't care about querystring
_invariantCacheKey = ComputeCacheKey(filterContext, null);
// don't retrieve cache content if refused
// in this case the result of the action will update the current cached version
if (filterContext.RequestContext.HttpContext.Request.Headers["Cache-Control"] != "no-cache") {
// fetch cached data
_cacheItem = _cacheStorageProvider.GetCacheItem(_cacheKey);
if (_cacheItem == null) {
Logger.Debug("Cached version not found");
}
}
else {
Logger.Debug("Cache-Control = no-cache requested");
}
var response = filterContext.HttpContext.Response;
// render cached content
if (_cacheItem != null) {
Logger.Debug("Cache item found, expires on " + _cacheItem.ValidUntilUtc);
var output = _cacheItem.Output;
// adds some caching information to the output if requested
if (_debugMode) {
response.AddHeader("X-Cached-On", _cacheItem.CachedOnUtc.ToString("r"));
response.AddHeader("X-Cached-Until", _cacheItem.ValidUntilUtc.ToString("r"));
}
// shorcut action execution
filterContext.Result = new ContentResult {
Content = output,
ContentType = _cacheItem.ContentType
};
response.StatusCode = _cacheItem.StatusCode;
ApplyCacheControl(_cacheItem, response);
return;
}
_cacheItem = new CacheItem();
// get contents
ApplyCacheControl(_cacheItem, response);
// no cache content available, intercept the execution results for caching
_previousFilter = response.Filter;
response.Filter = _filter = new CapturingResponseFilter();
}
public void OnActionExecuting(ActionExecutingContext filterContext)
{
// apply OutputCacheAttribute logic if defined
var actionAttributes = filterContext.ActionDescriptor.GetCustomAttributes(typeof(OutputCacheAttribute), true);
var controllerAttributes = filterContext.ActionDescriptor.ControllerDescriptor.GetCustomAttributes(typeof(OutputCacheAttribute), true);
var outputCacheAttribute = actionAttributes.Concat(controllerAttributes).Cast <OutputCacheAttribute>().FirstOrDefault();
if (outputCacheAttribute != null)
{
if (outputCacheAttribute.Duration <= 0 || outputCacheAttribute.NoStore)
{
Logger.Debug("Request ignored based on OutputCache attribute");
return;
}
}
// saving the current datetime
_now = _clock.UtcNow;
// before executing an action, we check if a valid cached result is already
// existing for this context (url, theme, culture, tenant)
Logger.Debug("Request on: " + filterContext.RequestContext.HttpContext.Request.RawUrl);
// don't cache POST requests
if (filterContext.HttpContext.Request.HttpMethod.Equals("POST", StringComparison.OrdinalIgnoreCase))
{
Logger.Debug("Request ignored on POST");
return;
}
// don't cache the admin
if (AdminFilter.IsApplied(new RequestContext(filterContext.HttpContext, new RouteData())))
{
Logger.Debug("Request ignored on Admin section");
return;
}
// ignore child actions, e.g. HomeController is using RenderAction()
if (filterContext.IsChildAction)
{
Logger.Debug("Request ignored on Child actions");
return;
}
_workContext = _workContextAccessor.GetContext();
// don't return any cached content, or cache any content, if the user is authenticated
if (_workContext.CurrentUser != null)
{
Logger.Debug("Request ignored on Authenticated user");
return;
}
// caches the default cache duration to prevent a query to the settings
_cacheDuration = _cacheManager.Get("CacheSettingsPart.Duration",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return(_workContext.CurrentSite.As <CacheSettingsPart>().DefaultCacheDuration);
}
);
// caches the default max age duration to prevent a query to the settings
_maxAge = _cacheManager.Get("CacheSettingsPart.MaxAge",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return(_workContext.CurrentSite.As <CacheSettingsPart>().DefaultMaxAge);
}
);
_varyQueryStringParameters = _cacheManager.Get("CacheSettingsPart.VaryQueryStringParameters",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
var varyQueryStringParameters = _workContext.CurrentSite.As <CacheSettingsPart>().VaryQueryStringParameters;
return(string.IsNullOrWhiteSpace(varyQueryStringParameters) ? null
: varyQueryStringParameters.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries).Select(s => s.Trim()).ToArray());
}
);
var varyRequestHeadersFromSettings = _cacheManager.Get("CacheSettingsPart.VaryRequestHeaders",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
var varyRequestHeaders = _workContext.CurrentSite.As <CacheSettingsPart>().VaryRequestHeaders;
return(string.IsNullOrWhiteSpace(varyRequestHeaders) ? null
: varyRequestHeaders.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries).Select(s => s.Trim()).ToArray());
}
);
_varyRequestHeaders = (varyRequestHeadersFromSettings == null) ? new HashSet <string>() : new HashSet <string>(varyRequestHeadersFromSettings);
// different tenants with the same urls have different entries
_varyRequestHeaders.Add("HOST");
// Set the Vary: Accept-Encoding response header.
// This instructs the proxies to cache two versions of the resource: one compressed, and one uncompressed.
// The correct version of the resource is delivered based on the client request header.
// This is a good choice for applications that are singly homed and depend on public proxies for user locality.
_varyRequestHeaders.Add("Accept-Encoding");
// caches the ignored urls to prevent a query to the settings
_ignoredUrls = _cacheManager.Get("CacheSettingsPart.IgnoredUrls",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return(_workContext.CurrentSite.As <CacheSettingsPart>().IgnoredUrls);
}
);
// caches the culture setting
_applyCulture = _cacheManager.Get("CacheSettingsPart.ApplyCulture",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return(_workContext.CurrentSite.As <CacheSettingsPart>().ApplyCulture);
}
);
// caches the debug mode
_debugMode = _cacheManager.Get("CacheSettingsPart.DebugMode",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return(_workContext.CurrentSite.As <CacheSettingsPart>().DebugMode);
}
);
// don't cache ignored url ?
if (IsIgnoredUrl(filterContext.RequestContext.HttpContext.Request.AppRelativeCurrentExecutionFilePath, _ignoredUrls))
{
return;
}
var queryString = filterContext.RequestContext.HttpContext.Request.QueryString;
var requestHeaders = filterContext.RequestContext.HttpContext.Request.Headers;
var parameters = new Dictionary <string, object>(filterContext.ActionParameters);
foreach (var key in queryString.AllKeys)
{
if (key == null)
{
continue;
}
parameters[key] = queryString[key];
}
foreach (var varyByRequestHeader in _varyRequestHeaders)
{
if (requestHeaders.AllKeys.Contains(varyByRequestHeader))
{
parameters["HEADER:" + varyByRequestHeader] = requestHeaders[varyByRequestHeader];
}
}
// compute the cache key
_cacheKey = ComputeCacheKey(filterContext, parameters);
// create a tag which doesn't care about querystring
_invariantCacheKey = ComputeCacheKey(filterContext, null);
// don't retrieve cache content if refused
// in this case the result of the action will update the current cached version
if (filterContext.RequestContext.HttpContext.Request.Headers["Cache-Control"] != "no-cache")
{
// fetch cached data
_cacheItem = _cacheStorageProvider.GetCacheItem(_cacheKey);
if (_cacheItem == null)
{
Logger.Debug("Cached version not found");
}
}
else
{
Logger.Debug("Cache-Control = no-cache requested");
}
var response = filterContext.HttpContext.Response;
// render cached content
if (_cacheItem != null)
{
Logger.Debug("Cache item found, expires on " + _cacheItem.ValidUntilUtc);
var output = _cacheItem.Output;
// adds some caching information to the output if requested
if (_debugMode)
{
response.AddHeader("X-Cached-On", _cacheItem.CachedOnUtc.ToString("r"));
response.AddHeader("X-Cached-Until", _cacheItem.ValidUntilUtc.ToString("r"));
}
// shorcut action execution
filterContext.Result = new ContentResult {
Content = output,
ContentType = _cacheItem.ContentType
};
response.StatusCode = _cacheItem.StatusCode;
ApplyCacheControl(_cacheItem, response);
return;
}
_cacheItem = new CacheItem();
// get contents
ApplyCacheControl(_cacheItem, response);
// no cache content available, intercept the execution results for caching
_previousFilter = response.Filter;
response.Filter = _filter = new CapturingResponseFilter();
}
public void OnResultExecuted(ResultExecutedContext filterContext)
{
var response = filterContext.HttpContext.Response;
if (!_cacheControlStrategy.IsCacheable(filterContext.Result, response))
{
_filter = null;
if (_previousFilter != null)
{
response.Filter = _previousFilter;
}
}
// ignore error results from cache
if (response.StatusCode != (int)HttpStatusCode.OK)
{
// Never cache non-200 responses.
filterContext.HttpContext.Response.Cache.SetCacheability(HttpCacheability.NoCache);
filterContext.HttpContext.Response.Cache.SetNoStore();
filterContext.HttpContext.Response.Cache.SetMaxAge(new TimeSpan(0));
_filter = null;
if (_previousFilter != null)
{
response.Filter = _previousFilter;
}
return;
}
// if the result of a POST is a Redirect, remove any Cache Item for this url
// so that the redirected client gets a fresh result
// also add a random token to the query string so that public cachers (IIS, proxies, ...) don't return cached content
// i.e., Comment creation
// ignore in admin
if (AdminFilter.IsApplied(new RequestContext(filterContext.HttpContext, new RouteData())))
{
_filter = null;
if (_previousFilter != null)
{
response.Filter = _previousFilter;
}
return;
}
_workContext = _workContextAccessor.GetContext();
// ignore authenticated requests
if (_workContext.CurrentUser != null)
{
_filter = null;
if (_previousFilter != null)
{
response.Filter = _previousFilter;
}
return;
}
// save the result only if the content can be intercepted
if (_filter == null)
{
return;
}
// flush here to force the Filter to get the rendered content
if (response.IsClientConnected)
{
response.Flush();
}
var output = _filter.GetContents(response.ContentEncoding);
if (String.IsNullOrWhiteSpace(output))
{
return;
}
response.Filter = null;
response.Write(output);
// check if there is a specific rule not to cache the whole route
var configurations = _cacheService.GetRouteConfigurations();
var route = filterContext.Controller.ControllerContext.RouteData.Route;
var key = _cacheService.GetRouteDescriptorKey(filterContext.HttpContext, route);
var configuration = configurations.FirstOrDefault(c => c.RouteKey == key);
// do not cache ?
if (configuration != null && configuration.Duration == 0)
{
return;
}
// don't cache the result of a POST redirection as it could contain notifications
if (_transformRedirect)
{
return;
}
// don't cache the result if there were some notifications
var messagesZone = _workContextAccessor.GetContext(filterContext).Layout.Zones["Messages"];
var hasNotifications = messagesZone != null && ((IEnumerable <dynamic>)messagesZone).Any();
if (hasNotifications)
{
return;
}
// default duration of specific one ?
var cacheDuration = configuration != null && configuration.Duration.HasValue ? configuration.Duration.Value : _cacheDuration;
if (cacheDuration <= 0)
{
return;
}
// include each of the content item ids as tags for the cache entry
var contentItemIds = _displayedContentItemHandler.GetDisplayed().Select(x => x.ToString(CultureInfo.InvariantCulture)).ToArray();
if (filterContext.HttpContext.Request.Url == null)
{
return;
}
_cacheItem.ContentType = response.ContentType;
_cacheItem.StatusCode = response.StatusCode;
_cacheItem.CachedOnUtc = _now;
_cacheItem.ValidFor = cacheDuration;
_cacheItem.QueryString = filterContext.HttpContext.Request.Url.Query;
_cacheItem.Output = output;
_cacheItem.CacheKey = _cacheKey;
_cacheItem.InvariantCacheKey = _invariantCacheKey;
_cacheItem.Tenant = _shellSettings.Name;
_cacheItem.Url = filterContext.HttpContext.Request.Url.AbsolutePath;
_cacheItem.Tags = new[] { _invariantCacheKey }.Union(contentItemIds).ToArray();
Logger.Debug("Cache item added: " + _cacheItem.CacheKey);
// remove old cache data
_cacheService.RemoveByTag(_invariantCacheKey);
// add data to cache
_cacheStorageProvider.Set(_cacheKey, _cacheItem);
// add to the tags index
foreach (var tag in _cacheItem.Tags)
{
_tagCache.Tag(tag, _cacheKey);
}
}
public void OnActionExecuted(ActionExecutedContext filterContext) {
// only cache view results, but don't return already as we still need to process redirections
if (!(filterContext.Result is ViewResultBase) && !( AuthorizedContentTypes.Contains(filterContext.HttpContext.Response.ContentType))) {
_filter = null;
}
// ignore error results from cache
if (filterContext.HttpContext.Response.StatusCode != (int)HttpStatusCode.OK) {
// Never cache non-200 responses.
filterContext.HttpContext.Response.Cache.SetCacheability(HttpCacheability.NoCache);
filterContext.HttpContext.Response.Cache.SetNoStore();
filterContext.HttpContext.Response.Cache.SetMaxAge(new TimeSpan(0));
_filter = null;
return;
}
// if the result of a POST is a Redirect, remove any Cache Item for this url
// so that the redirected client gets a fresh result
// also add a random token to the query string so that public cachers (IIS, proxies, ...) don't return cached content
// i.e., Comment creation
// ignore in admin
if (AdminFilter.IsApplied(new RequestContext(filterContext.HttpContext, new RouteData()))) {
return;
}
_workContext = _workContextAccessor.GetContext();
// ignore authenticated requests
if (_workContext.CurrentUser != null) {
return;
}
// todo: look for RedirectToRoute to, or intercept 302s
if (filterContext.HttpContext.Request.HttpMethod.Equals("POST", StringComparison.OrdinalIgnoreCase)
&& filterContext.Result is RedirectResult) {
Logger.Debug("Redirect on POST");
var redirectUrl = ((RedirectResult)filterContext.Result).Url;
if (!VirtualPathUtility.IsAbsolute(redirectUrl)) {
var applicationRoot = filterContext.HttpContext.Request.ToRootUrlString();
if (redirectUrl.StartsWith(applicationRoot, StringComparison.OrdinalIgnoreCase)) {
redirectUrl = redirectUrl.Substring(applicationRoot.Length);
}
}
// querystring invariant key
var invariantCacheKey = ComputeCacheKey(
_shellSettings.Name,
redirectUrl,
() => _workContext.CurrentCulture,
_themeManager.GetRequestTheme(filterContext.RequestContext).Id,
null
);
_cacheService.RemoveByTag(invariantCacheKey);
// adding a refresh key so that the next request will not be cached
var epIndex = redirectUrl.IndexOf('?');
var qs = new NameValueCollection();
if (epIndex > 0) {
qs = HttpUtility.ParseQueryString(redirectUrl.Substring(epIndex));
}
var refresh = _now.Ticks;
qs.Remove(RefreshKey);
qs.Add(RefreshKey, refresh.ToString("x"));
var querystring = "?" + string.Join("&", Array.ConvertAll(qs.AllKeys, k => string.Format("{0}={1}", HttpUtility.UrlEncode(k), HttpUtility.UrlEncode(qs[k]))));
if (epIndex > 0) {
redirectUrl = redirectUrl.Substring(0, epIndex) + querystring;
}
else {
redirectUrl = redirectUrl + querystring;
}
filterContext.Result = new RedirectResult(redirectUrl, ((RedirectResult)filterContext.Result).Permanent);
filterContext.HttpContext.Response.Cache.SetCacheability(HttpCacheability.NoCache);
}
}
public void OnActionExecuted(ActionExecutedContext filterContext)
{
// only cache view results, but don't return already as we still need to process redirections
if (!(filterContext.Result is ViewResultBase) && !(AuthorizedContentTypes.Contains(filterContext.HttpContext.Response.ContentType)))
{
_filter = null;
}
// ignore error results from cache
if (filterContext.HttpContext.Response.StatusCode != (int)HttpStatusCode.OK)
{
// Never cache non-200 responses.
filterContext.HttpContext.Response.Cache.SetCacheability(HttpCacheability.NoCache);
filterContext.HttpContext.Response.Cache.SetNoStore();
filterContext.HttpContext.Response.Cache.SetMaxAge(new TimeSpan(0));
_filter = null;
return;
}
// if the result of a POST is a Redirect, remove any Cache Item for this url
// so that the redirected client gets a fresh result
// also add a random token to the query string so that public cachers (IIS, proxies, ...) don't return cached content
// i.e., Comment creation
// ignore in admin
if (AdminFilter.IsApplied(new RequestContext(filterContext.HttpContext, new RouteData())))
{
return;
}
_workContext = _workContextAccessor.GetContext();
// ignore authenticated requests
if (_workContext.CurrentUser != null)
{
return;
}
// todo: look for RedirectToRoute to, or intercept 302s
if (filterContext.HttpContext.Request.HttpMethod.Equals("POST", StringComparison.OrdinalIgnoreCase) &&
filterContext.Result is RedirectResult)
{
Logger.Debug("Redirect on POST");
var redirectUrl = ((RedirectResult)filterContext.Result).Url;
if (!VirtualPathUtility.IsAbsolute(redirectUrl))
{
var applicationRoot = filterContext.HttpContext.Request.ToRootUrlString();
if (redirectUrl.StartsWith(applicationRoot, StringComparison.OrdinalIgnoreCase))
{
redirectUrl = redirectUrl.Substring(applicationRoot.Length);
}
}
// querystring invariant key
var invariantCacheKey = ComputeCacheKey(
_shellSettings.Name,
redirectUrl,
() => _workContext.CurrentCulture,
_themeManager.GetRequestTheme(filterContext.RequestContext).Id,
null
);
_cacheService.RemoveByTag(invariantCacheKey);
// adding a refresh key so that the next request will not be cached
var epIndex = redirectUrl.IndexOf('?');
var qs = new NameValueCollection();
if (epIndex > 0)
{
qs = HttpUtility.ParseQueryString(redirectUrl.Substring(epIndex));
}
var refresh = _now.Ticks;
qs.Remove(RefreshKey);
qs.Add(RefreshKey, refresh.ToString("x"));
var querystring = "?" + string.Join("&", Array.ConvertAll(qs.AllKeys, k => string.Format("{0}={1}", HttpUtility.UrlEncode(k), HttpUtility.UrlEncode(qs[k]))));
if (epIndex > 0)
{
redirectUrl = redirectUrl.Substring(0, epIndex) + querystring;
}
else
{
redirectUrl = redirectUrl + querystring;
}
filterContext.Result = new RedirectResult(redirectUrl, ((RedirectResult)filterContext.Result).Permanent);
filterContext.HttpContext.Response.Cache.SetCacheability(HttpCacheability.NoCache);
}
}
public void OnActionExecuting(ActionExecutingContext filterContext)
{
// use the action in the cacheKey so that the same route can't return cache for different actions
_actionName = filterContext.ActionDescriptor.ActionName;
// apply OutputCacheAttribute logic if defined
var outputCacheAttribute = filterContext.ActionDescriptor.GetCustomAttributes(typeof (OutputCacheAttribute), true).Cast<OutputCacheAttribute>().FirstOrDefault() ;
if(outputCacheAttribute != null) {
if (outputCacheAttribute.Duration <= 0 || outputCacheAttribute.NoStore) {
Logger.Debug("Request ignored based on OutputCache attribute");
return;
}
}
// saving the current datetime
_now = _clock.UtcNow;
// before executing an action, we check if a valid cached result is already
// existing for this context (url, theme, culture, tenant)
Logger.Debug("Request on: " + filterContext.RequestContext.HttpContext.Request.RawUrl);
// don't cache POST requests
if(filterContext.HttpContext.Request.HttpMethod.Equals("POST", StringComparison.OrdinalIgnoreCase) ) {
Logger.Debug("Request ignored on POST");
return;
}
// don't cache the admin
if (AdminFilter.IsApplied(new RequestContext(filterContext.HttpContext, new RouteData()))) {
Logger.Debug("Request ignored on Admin section");
return;
}
// ignore child actions, e.g. HomeController is using RenderAction()
if (filterContext.IsChildAction){
Logger.Debug("Request ignored on Child actions");
return;
}
_workContext = _workContextAccessor.GetContext();
// don't return any cached content, or cache any content, if the user is authenticated
if (_workContext.CurrentUser != null) {
Logger.Debug("Request ignored on Authenticated user");
return;
}
// caches the default cache duration to prevent a query to the settings
_cacheDuration = _cacheManager.Get("CacheSettingsPart.Duration",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return _workContext.CurrentSite.As<CacheSettingsPart>().DefaultCacheDuration;
}
);
// caches the default max age duration to prevent a query to the settings
_maxAge = _cacheManager.Get("CacheSettingsPart.MaxAge",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return _workContext.CurrentSite.As<CacheSettingsPart>().DefaultMaxAge;
}
);
_varyQueryStringParameters = _cacheManager.Get("CacheSettingsPart.VaryQueryStringParameters",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
var varyQueryStringParameters = _workContext.CurrentSite.As<CacheSettingsPart>().VaryQueryStringParameters;
return string.IsNullOrWhiteSpace(varyQueryStringParameters) ? null
: varyQueryStringParameters.Split(new[]{","}, StringSplitOptions.RemoveEmptyEntries).Select(s => s.Trim()).ToArray();
}
);
// caches the ignored urls to prevent a query to the settings
_ignoredUrls = _cacheManager.Get("CacheSettingsPart.IgnoredUrls",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return _workContext.CurrentSite.As<CacheSettingsPart>().IgnoredUrls;
}
);
// caches the culture setting
_applyCulture = _cacheManager.Get("CacheSettingsPart.ApplyCulture",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return _workContext.CurrentSite.As<CacheSettingsPart>().ApplyCulture;
}
);
// caches the ignored urls to prevent a query to the settings
_debugMode = _cacheManager.Get("CacheSettingsPart.DebugMode",
context => {
context.Monitor(_signals.When(CacheSettingsPart.CacheKey));
return _workContext.CurrentSite.As<CacheSettingsPart>().DebugMode;
}
);
var queryString = filterContext.RequestContext.HttpContext.Request.QueryString;
var parameters = new Dictionary<string, object>(filterContext.ActionParameters);
foreach(var key in queryString.AllKeys) {
if (key == null) continue;
parameters[key] = queryString[key];
}
// compute the cache key
_cacheKey = ComputeCacheKey(filterContext, parameters);
// create a tag which doesn't care about querystring
_invariantCacheKey = ComputeCacheKey(filterContext, null);
// don't retrieve cache content if refused
// in this case the result of the action will update the current cached version
if (filterContext.RequestContext.HttpContext.Request.Headers["Cache-Control"] != "no-cache") {
// fetch cached data
_cacheItem = _cacheStorageProvider.GetCacheItem(_cacheKey);
if (_cacheItem == null) {
Logger.Debug("Cached version not found");
}
}
else {
Logger.Debug("Cache-Control = no-cache requested");
}
var response = filterContext.HttpContext.Response;
// render cached content
if (_cacheItem != null)
{
Logger.Debug("Cache item found, expires on " + _cacheItem.ValidUntilUtc);
var output = _cacheItem.Output;
/*
*
* There is no need to replace the AntiForgeryToken as it is not used for unauthenticated requests
* and at this point, the request can't be authenticated
*
*
// replace any anti forgery token with a fresh value
if (output.Contains(AntiforgeryBeacon))
{
var viewContext = new ViewContext
{
HttpContext = filterContext.HttpContext,
Controller = filterContext.Controller
};
var htmlHelper = new HtmlHelper(viewContext, new ViewDataContainer());
var siteSalt = _workContext.CurrentSite.SiteSalt;
var token = htmlHelper.AntiForgeryToken(siteSalt);
output = output.Replace(AntiforgeryBeacon, token.ToString());
}
*/
// adds some caching information to the output if requested
if (_debugMode)
{
output += "\r\n<!-- Cached on " + _cacheItem.CachedOnUtc + " (UTC) until " + _cacheItem.ValidUntilUtc + " (UTC) -->";
response.AddHeader("X-Cached-On", _cacheItem.CachedOnUtc.ToString("r"));
response.AddHeader("X-Cached-Until", _cacheItem.ValidUntilUtc.ToString("r"));
}
filterContext.Result = new ContentResult
{
Content = output,
ContentType = _cacheItem.ContentType
};
response.StatusCode = _cacheItem.StatusCode;
ApplyCacheControl(_cacheItem, response);
return;
}
_cacheItem = new CacheItem();
// get contents
ApplyCacheControl(_cacheItem, response);
// no cache content available, intercept the execution results for caching
response.Filter = _filter = new CapturingResponseFilter(response.Filter);
}