void IHttpHandler.ProcessRequest(HttpContext context)
{
var url = EwfApp.GetRequestAppRelativeUrl(context.Request);
var queryIndex = url.IndexOf("?", StringComparison.Ordinal);
if (queryIndex >= 0)
{
url = url.Remove(queryIndex);
}
var extensionIndex = url.LastIndexOf(".", StringComparison.Ordinal);
var versionStringOrFileExtensionIndex = extensionIndex;
var urlVersionString = "";
if (url.StartsWith(VersionedFilesFolderName + "/") || url.StartsWith(EwfFolderName + "/" + VersionedFilesFolderName + "/"))
{
urlVersionString = "invariant";
}
else
{
// We assume that all URL version strings will have the same length as the format string.
var prefixedVersionStringIndex = extensionIndex - (urlVersionStringPrefix.Length + EwfSafeResponseWriter.UrlVersionStringFormat.Length);
if (prefixedVersionStringIndex >= 0)
{
DateTimeOffset dateAndTime;
var versionString = url.Substring(prefixedVersionStringIndex + urlVersionStringPrefix.Length, EwfSafeResponseWriter.UrlVersionStringFormat.Length);
if (DateTimeOffset.TryParseExact(
versionString,
EwfSafeResponseWriter.UrlVersionStringFormat,
DateTimeFormatInfo.InvariantInfo,
DateTimeStyles.None,
out dateAndTime))
{
versionStringOrFileExtensionIndex = prefixedVersionStringIndex;
urlVersionString = versionString;
}
}
}
if (versionStringOrFileExtensionIndex < 0)
{
throw new ResourceNotAvailableException("Failed to find the extension in the URL.", null);
}
var extension = url.Substring(extensionIndex);
var staticFileInfo =
EwfApp.GlobalType.Assembly.CreateInstance(
CombineNamespacesAndProcessEwfIfNecessary(
EwfApp.GlobalType.Namespace,
(url.Remove(versionStringOrFileExtensionIndex) + extension.CapitalizeString()).Separate("/", false)
.Select(StandardLibraryMethods.GetCSharpIdentifier)
.Aggregate((a, b) => a + "." + b) + "+Info")) as StaticFileInfo;
if (staticFileInfo == null)
{
throw new ResourceNotAvailableException("Failed to create an Info object for the request.", null);
}
var mediaTypeOverride = EwfApp.Instance.GetMediaTypeOverrides().SingleOrDefault(i => i.FileExtension == extension);
var contentType = mediaTypeOverride != null ? mediaTypeOverride.MediaType : MimeTypeMap.MimeTypeMap.GetMimeType(extension);
Func <string> cacheKeyGetter = () => staticFileInfo.GetUrl(false, false, false);
EwfSafeResponseWriter responseWriter;
if (contentType == ContentTypes.Css)
{
Func <string> cssGetter = () => File.ReadAllText(staticFileInfo.FilePath);
responseWriter = urlVersionString.Any()
? new EwfSafeResponseWriter(
cssGetter,
urlVersionString,
() => new ResponseMemoryCachingSetup(cacheKeyGetter(), staticFileInfo.GetResourceLastModificationDateAndTime()))
: new EwfSafeResponseWriter(
() => new EwfResponse(ContentTypes.Css, new EwfResponseBodyCreator(() => CssPreprocessor.TransformCssFile(cssGetter()))),
staticFileInfo.GetResourceLastModificationDateAndTime(),
memoryCacheKeyGetter: cacheKeyGetter);
}
else
{
Func <EwfResponse> responseCreator = () => new EwfResponse(
contentType,
new EwfResponseBodyCreator(
responseStream => {
using (var fileStream = File.OpenRead(staticFileInfo.FilePath))
IoMethods.CopyStream(fileStream, responseStream);
}));
responseWriter = urlVersionString.Any()
? new EwfSafeResponseWriter(
responseCreator,
urlVersionString,
memoryCachingSetupGetter:
() => new ResponseMemoryCachingSetup(cacheKeyGetter(), staticFileInfo.GetResourceLastModificationDateAndTime()))
: new EwfSafeResponseWriter(
responseCreator,
staticFileInfo.GetResourceLastModificationDateAndTime(),
memoryCacheKeyGetter: cacheKeyGetter);
}
responseWriter.WriteResponse();
}
/// <summary>
/// Creates a response writer with CSS text.
/// </summary>
/// <param name="cssGetter">A function that gets the CSS that will be preprocessed and used as the response. Do not pass or return null.</param>
/// <param name="urlVersionString">The resource-version string from the request URL. Do not pass null or the empty string; this parameter is required
/// because it greatly improves cacheability, which is important for CSS. You must change the URL when the CSS changes, and you must not vary the response
/// based on non-URL elements of the request, such as the authenticated user.</param>
/// <param name="memoryCachingSetupGetter">A function that gets the memory-caching setup object for the response. Do not pass or return null; memory caching
/// is important for CSS and is therefore required.</param>
public EwfSafeResponseWriter(Func <string> cssGetter, string urlVersionString, Func <ResponseMemoryCachingSetup> memoryCachingSetupGetter)
{
var memoryCachingSetup = new Lazy <ResponseMemoryCachingSetup>(memoryCachingSetupGetter);
writer = createWriter(
() => new EwfResponse(ContentTypes.Css, new EwfResponseBodyCreator(() => CssPreprocessor.TransformCssFile(cssGetter()))),
urlVersionString,
"",
() => memoryCachingSetup.Value.LastModificationDateAndTime,
() => memoryCachingSetup.Value.CacheKey);
}
