338 lines
13 KiB
C#
338 lines
13 KiB
C#
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namespace System.Web.Mvc {
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using System;
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using System.Collections.Generic;
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using System.Diagnostics.CodeAnalysis;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Runtime.Caching;
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using System.Security.Cryptography;
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using System.Text;
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using System.Web;
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using System.Web.Mvc.Resources;
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using System.Web.UI;
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[SuppressMessage("Microsoft.Performance", "CA1813:AvoidUnsealedAttributes", Justification = "Unsealed so that subclassed types can set properties in the default constructor.")]
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[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = false)]
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public class OutputCacheAttribute : ActionFilterAttribute, IExceptionFilter {
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private OutputCacheParameters _cacheSettings = new OutputCacheParameters { VaryByParam = "*" };
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private const string _cacheKeyPrefix = "_MvcChildActionCache_";
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private static ObjectCache _childActionCache;
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private Func<ObjectCache> _childActionCacheThunk = () => ChildActionCache;
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private static object _childActionFilterFinishCallbackKey = new object();
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private bool _locationWasSet;
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private bool _noStoreWasSet;
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public OutputCacheAttribute() {
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}
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internal OutputCacheAttribute(ObjectCache childActionCache) {
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_childActionCacheThunk = () => childActionCache;
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}
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public string CacheProfile {
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get {
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return _cacheSettings.CacheProfile ?? String.Empty;
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}
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set {
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_cacheSettings.CacheProfile = value;
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}
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}
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internal OutputCacheParameters CacheSettings {
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get {
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return _cacheSettings;
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}
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}
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public static ObjectCache ChildActionCache {
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get {
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return _childActionCache ?? MemoryCache.Default;
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}
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set {
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_childActionCache = value;
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}
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}
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private ObjectCache ChildActionCacheInternal {
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get {
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return _childActionCacheThunk();
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}
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}
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public int Duration {
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get {
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return _cacheSettings.Duration;
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}
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set {
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_cacheSettings.Duration = value;
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}
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}
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public OutputCacheLocation Location {
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get {
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return _cacheSettings.Location;
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}
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set {
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_cacheSettings.Location = value;
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_locationWasSet = true;
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}
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}
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public bool NoStore {
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get {
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return _cacheSettings.NoStore;
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}
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set {
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_cacheSettings.NoStore = value;
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_noStoreWasSet = true;
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}
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}
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public string SqlDependency {
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get {
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return _cacheSettings.SqlDependency ?? String.Empty;
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}
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set {
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_cacheSettings.SqlDependency = value;
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}
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}
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public string VaryByContentEncoding {
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get {
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return _cacheSettings.VaryByContentEncoding ?? String.Empty;
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}
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set {
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_cacheSettings.VaryByContentEncoding = value;
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}
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}
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public string VaryByCustom {
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get {
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return _cacheSettings.VaryByCustom ?? String.Empty;
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}
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set {
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_cacheSettings.VaryByCustom = value;
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}
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}
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public string VaryByHeader {
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get {
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return _cacheSettings.VaryByHeader ?? String.Empty;
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}
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set {
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_cacheSettings.VaryByHeader = value;
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}
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}
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[SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "Param", Justification = "Matches the @ OutputCache page directive.")]
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public string VaryByParam {
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get {
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return _cacheSettings.VaryByParam ?? String.Empty;
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}
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set {
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_cacheSettings.VaryByParam = value;
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}
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}
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private static void ClearChildActionFilterFinishCallback(ControllerContext controllerContext) {
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controllerContext.HttpContext.Items.Remove(_childActionFilterFinishCallbackKey);
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}
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private static void CompleteChildAction(ControllerContext filterContext, bool wasException) {
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Action<bool> callback = GetChildActionFilterFinishCallback(filterContext);
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if (callback != null) {
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ClearChildActionFilterFinishCallback(filterContext);
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callback(wasException);
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}
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}
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private static Action<bool> GetChildActionFilterFinishCallback(ControllerContext controllerContext) {
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return controllerContext.HttpContext.Items[_childActionFilterFinishCallbackKey] as Action<bool>;
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}
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internal string GetChildActionUniqueId(ActionExecutingContext filterContext) {
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StringBuilder uniqueIdBuilder = new StringBuilder();
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// Start with a prefix, presuming that we share the cache with other users
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uniqueIdBuilder.Append(_cacheKeyPrefix);
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// Unique ID of the action description
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uniqueIdBuilder.Append(filterContext.ActionDescriptor.UniqueId);
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// Unique ID from the VaryByCustom settings, if any
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uniqueIdBuilder.Append(DescriptorUtil.CreateUniqueId(VaryByCustom));
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if (!String.IsNullOrEmpty(VaryByCustom)) {
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string varyByCustomResult = filterContext.HttpContext.ApplicationInstance.GetVaryByCustomString(HttpContext.Current, VaryByCustom);
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uniqueIdBuilder.Append(varyByCustomResult);
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}
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// Unique ID from the VaryByParam settings, if any
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uniqueIdBuilder.Append(GetUniqueIdFromActionParameters(filterContext, SplitVaryByParam(VaryByParam)));
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// The key is typically too long to be useful, so we use a cryptographic hash
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// as the actual key (better randomization and key distribution, so small vary
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// values will generate dramtically different keys).
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using (SHA256 sha = SHA256.Create()) {
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return Convert.ToBase64String(sha.ComputeHash(Encoding.UTF8.GetBytes(uniqueIdBuilder.ToString())));
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}
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}
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private static string GetUniqueIdFromActionParameters(ActionExecutingContext filterContext, IEnumerable<string> keys) {
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// Generate a unique ID of normalized key names + key values
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var keyValues = new Dictionary<string, object>(filterContext.ActionParameters, StringComparer.OrdinalIgnoreCase);
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keys = (keys ?? keyValues.Keys).Select(key => key.ToUpperInvariant())
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.OrderBy(key => key, StringComparer.Ordinal);
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return DescriptorUtil.CreateUniqueId(keys.Concat(keys.Select(key => keyValues.ContainsKey(key) ? keyValues[key] : null)));
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}
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public static bool IsChildActionCacheActive(ControllerContext controllerContext) {
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return GetChildActionFilterFinishCallback(controllerContext) != null;
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}
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public override void OnActionExecuted(ActionExecutedContext filterContext) {
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if (filterContext == null) {
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throw new ArgumentNullException("filterContext");
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}
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// Complete the request if the child action threw an exception
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if (filterContext.IsChildAction && filterContext.Exception != null) {
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CompleteChildAction(filterContext, wasException: true);
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}
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}
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public override void OnActionExecuting(ActionExecutingContext filterContext) {
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if (filterContext == null) {
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throw new ArgumentNullException("filterContext");
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}
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if (filterContext.IsChildAction) {
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ValidateChildActionConfiguration();
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// Already actively being captured? (i.e., cached child action inside of cached child action)
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// Realistically, this needs write substitution to do properly (including things like authentication)
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if (GetChildActionFilterFinishCallback(filterContext) != null) {
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throw new InvalidOperationException(MvcResources.OutputCacheAttribute_CannotNestChildCache);
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}
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// Already cached?
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string uniqueId = GetChildActionUniqueId(filterContext);
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string cachedValue = ChildActionCacheInternal.Get(uniqueId) as string;
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if (cachedValue != null) {
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filterContext.Result = new ContentResult() { Content = cachedValue };
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return;
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}
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// Swap in a new TextWriter so we can capture the output
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StringWriter cachingWriter = new StringWriter(CultureInfo.InvariantCulture);
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TextWriter originalWriter = filterContext.HttpContext.Response.Output;
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filterContext.HttpContext.Response.Output = cachingWriter;
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// Set a finish callback to clean up
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SetChildActionFilterFinishCallback(filterContext, wasException => {
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// Restore original writer
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filterContext.HttpContext.Response.Output = originalWriter;
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// Grab output and write it
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string capturedText = cachingWriter.ToString();
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filterContext.HttpContext.Response.Write(capturedText);
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// Only cache output if this wasn't an error
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if (!wasException) {
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ChildActionCacheInternal.Add(uniqueId, capturedText, DateTimeOffset.UtcNow.AddSeconds(Duration));
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}
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});
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}
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}
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public void OnException(ExceptionContext filterContext) {
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if (filterContext == null) {
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throw new ArgumentNullException("filterContext");
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}
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if (filterContext.IsChildAction) {
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CompleteChildAction(filterContext, wasException: true);
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}
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}
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public override void OnResultExecuting(ResultExecutingContext filterContext) {
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if (filterContext == null) {
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throw new ArgumentNullException("filterContext");
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}
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if (!filterContext.IsChildAction) {
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// we need to call ProcessRequest() since there's no other way to set the Page.Response intrinsic
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using (OutputCachedPage page = new OutputCachedPage(_cacheSettings)) {
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page.ProcessRequest(HttpContext.Current);
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}
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}
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}
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public override void OnResultExecuted(ResultExecutedContext filterContext) {
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if (filterContext == null) {
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throw new ArgumentNullException("filterContext");
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}
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if (filterContext.IsChildAction) {
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CompleteChildAction(filterContext, wasException: filterContext.Exception != null);
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}
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}
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private static void SetChildActionFilterFinishCallback(ControllerContext controllerContext, Action<bool> callback) {
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controllerContext.HttpContext.Items[_childActionFilterFinishCallbackKey] = callback;
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}
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private static IEnumerable<string> SplitVaryByParam(string varyByParam) {
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if (String.Equals(varyByParam, "none", StringComparison.OrdinalIgnoreCase)) { // Vary by nothing
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return Enumerable.Empty<string>();
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}
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if (String.Equals(varyByParam, "*", StringComparison.OrdinalIgnoreCase)) { // Vary by everything
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return null;
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}
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return from part in varyByParam.Split(';') // Vary by specific parameters
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let trimmed = part.Trim()
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where !String.IsNullOrEmpty(trimmed)
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select trimmed;
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}
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private void ValidateChildActionConfiguration() {
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if (Duration <= 0) {
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throw new InvalidOperationException(MvcResources.OutputCacheAttribute_InvalidDuration);
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}
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if (String.IsNullOrWhiteSpace(VaryByParam)) {
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throw new InvalidOperationException(MvcResources.OutputCacheAttribute_InvalidVaryByParam);
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}
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if (!String.IsNullOrWhiteSpace(CacheProfile) ||
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!String.IsNullOrWhiteSpace(SqlDependency) ||
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!String.IsNullOrWhiteSpace(VaryByContentEncoding) ||
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!String.IsNullOrWhiteSpace(VaryByHeader) ||
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_locationWasSet || _noStoreWasSet) {
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throw new InvalidOperationException(MvcResources.OutputCacheAttribute_ChildAction_UnsupportedSetting);
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}
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}
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private sealed class OutputCachedPage : Page {
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private OutputCacheParameters _cacheSettings;
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public OutputCachedPage(OutputCacheParameters cacheSettings) {
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// Tracing requires Page IDs to be unique.
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ID = Guid.NewGuid().ToString();
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_cacheSettings = cacheSettings;
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}
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protected override void FrameworkInitialize() {
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// when you put the <%@ OutputCache %> directive on a page, the generated code calls InitOutputCache() from here
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base.FrameworkInitialize();
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InitOutputCache(_cacheSettings);
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}
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}
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}
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}
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