void Pipeline_Rewrite(IHttpModule sender, HttpContext context, Configuration.IUrlEventArgs e)
{
//Remove 'iefix' immediately if it's not relevant so we don't slow down static requests or do needless re-encoding.
if (!NeedsPngFix(context))
{
e.QueryString.Remove("iefix");
}
}
void Pipeline_RewriteDefaults(IHttpModule sender, HttpContext context, Configuration.IUrlEventArgs e)
{
//If this is IE 6 or earlier, and catchall is enabled, add iefix=true to all requests, regardless of (current) file type.
//Rewriting rules may change the format or add it later, we'll filter to just PNG requests in PostRewrite.
if (NeedsPngFix(context) && CatchAll)
{
e.QueryString["iefix"] = "true"; //If CatchAll is enabled, it's a png, and we set the default value here.
}
}
/// <summary>
/// In case there is no querystring attached to the file (thus no operations on the fly) we can
/// redirect directly to the blob. This let us take advantage of the CDN (if configured).
/// </summary>
/// <param name="sender"></param>
/// <param name="context"></param>
/// <param name="e"></param>
void Pipeline_PostRewrite(IHttpModule sender, HttpContext context, Configuration.IUrlEventArgs e)
{
string prefix = vpp.VirtualFilesystemPrefix;
// Check if prefix is within virtual file system and if there is no querystring
if (e.VirtualPath.StartsWith(prefix, StringComparison.OrdinalIgnoreCase) && e.QueryString.Count == 0)
{
// Strip prefix from virtual path; keep container and blob
string relativeBlobURL = e.VirtualPath.Substring(prefix.Length).TrimStart('/', '\\');
// Redirect to blob
context.Response.Redirect(blobStorageEndpoint + relativeBlobURL);
}
}
/// <summary>
/// In case there is no querystring attached to the file (thus no operations on the fly) we can
/// redirect directly to the blob. This let us offload traffic to blob storage
/// </summary>
/// <param name="sender"></param>
/// <param name="context"></param>
/// <param name="e"></param>
void Pipeline_PostRewrite(IHttpModule sender, HttpContext context, Configuration.IUrlEventArgs e)
{
string prefix = VirtualFilesystemPrefix;
// Check if prefix is within virtual file system and if there is no querystring
if (RedirectToBlobIfUnmodified && Belongs(e.VirtualPath) && !c.Pipeline.HasPipelineDirective(e.QueryString))
{
// Strip prefix from virtual path; keep container and blob
string relativeBlobURL = e.VirtualPath.Substring(prefix.Length).TrimStart('/', '\\');
// Redirect to blob
//TODO: Add shared access signature if enabled
context.Response.Redirect(blobStorageEndpoint + relativeBlobURL);
}
}
void Pipeline_PostRewrite(IHttpModule sender, HttpContext context, Configuration.IUrlEventArgs e)
{
if (e.QueryString.Get("iefix", false) && NeedsPngFix(context) && DestFormatPng(e))
{
if (Redirect)
{
//Get the original request URL, and change the 'format' setting to 'gif'.
NameValueCollection newValues = new NameValueCollection();
newValues["format"] = "gif";
context.Response.Redirect(PathUtils.MergeOverwriteQueryString(context.Request.RawUrl, newValues), true);
}
else
{
e.QueryString["format"] = "gif";
}
}
e.QueryString.Remove("iefix");
}
void Pipeline_RewriteDefaults(System.Web.IHttpModule sender, System.Web.HttpContext context, Configuration.IUrlEventArgs e)
{
//Handles /resize(width,height,format)/ and /resize(width,height)/ syntaxes.
e.VirtualPath = parseResizeFolderSyntax(e.VirtualPath, e.QueryString);
}
void Pipeline_ImageMissing(System.Web.IHttpModule sender, System.Web.HttpContext context, Configuration.IUrlEventArgs e)
{
if (!string.IsNullOrEmpty(e.QueryString["404"]))
{
//Resolve the path to virtual or app-relative for
string path = resolve404Path(e.QueryString["404"]);
//Resolve to virtual path
path = Util.PathUtils.ResolveAppRelative(path);
// Merge commands from the 404 querystring with ones from the
// original image. We start by sanitizing the querystring from
// the image.
ResizeSettings imageQuery = new ResizeSettings(e.QueryString);
imageQuery.Normalize();
// Use the configured settings by default.
var filterMode = this.filterMode;
var except = this.except;
// To support querystring-specifiable filter mode and exceptions,
// uncomment the if block below.
////// If the imageQuery includes specific 404 command-filtering,
////// (*either* of the values), use those instead of the
////// configured defaults.
////if (!string.IsNullOrEmpty(e.QueryString["404.filterMode"]) ||
//// !string.IsNullOrEmpty(e.QueryString["404.except"]))
////{
//// filterMode = NameValueCollectionExtensions.Get(e.QueryString, "404.filterMode", FilterMode.ExcludeUnknownCommands);
//// except = MatcherCollection.Parse(e.QueryString["404.except"]);
////}
// remove all of the commands we're supposed to remove... we
// clone the list of keys so that we're not modifying the collection
// while we enumerate it.
var shouldRemove = CreateRemovalMatcher(filterMode, except);
var names = new List <string>(imageQuery.AllKeys);
foreach (var name in names)
{
if (shouldRemove(name, imageQuery[name]))
{
imageQuery.Remove(name);
}
}
// Always remove the '404', '404.filterMode', and '404.except' settings.
imageQuery.Remove("404");
imageQuery.Remove("404.filterMode");
imageQuery.Remove("404.except");
ResizeSettings i404Query = new ResizeSettings(Util.PathUtils.ParseQueryString(path));
i404Query.Normalize();
//Overwrite new with old
foreach (string key in i404Query.Keys)
{
if (key != null)
{
imageQuery[key] = i404Query[key];
}
}
path = PathUtils.AddQueryString(PathUtils.RemoveQueryString(path), PathUtils.BuildQueryString(imageQuery));
//Redirect
context.Response.Redirect(path, true);
}
}
void Pipeline_RewriteDefaults(System.Web.IHttpModule sender, System.Web.HttpContext context, Configuration.IUrlEventArgs e)
{
//Only works with blob provided files
//Non-images will be served as-is
//Cache all file types, whether they are processed or not.
if (CacheUnmodifiedFiles && Belongs(e.VirtualPath))
{
e.QueryString["cache"] = ServerCacheMode.Always.ToString();
}
}
void Pipeline_PostRewrite(System.Web.IHttpModule sender, System.Web.HttpContext context, Configuration.IUrlEventArgs e)
{
//Only work with database images
//If the data is untrusted, always re-encode each file.
if (UntrustedData && Belongs(e.VirtualPath))
{
e.QueryString["process"] = ImageResizer.ProcessWhen.Always.ToString();
}
}
void Pipeline_Rewrite(System.Web.IHttpModule sender, System.Web.HttpContext context, Configuration.IUrlEventArgs e)
{
string file = Path.GetFileName(e.VirtualPath);
if (activeFilenames.Contains(file))
{
string filePhysicalPath = PathUtils.MapPathIfAppRelative("~" + e.VirtualPath);
if (!File.Exists(filePhysicalPath))
{
string physicalDirPath = Path.GetDirectoryName(filePhysicalPath);
string[] files = Directory.GetFiles(physicalDirPath, "*.jpg", SearchOption.TopDirectoryOnly);
if (files.Length > 0)
{
Random r = new Random();
int index = r.Next(0, files.Length);
file = files[index];
string newVirtualPath = Path.GetDirectoryName(e.VirtualPath).Replace("\\", "/") + "/" + Path.GetFileName(file);
e.VirtualPath = newVirtualPath;
}
else
{
string fallback = c.get("folderThumb.default", "");
e.VirtualPath = "/images/" + fallback;
}
if (e.QueryString.Count == 0)
{
var col = new NameValueCollection();
col.Add("fthumb", "true");
e.QueryString.Add(col);
}
}
}
}
void Pipeline_ImageMissing(System.Web.IHttpModule sender, System.Web.HttpContext context, Configuration.IUrlEventArgs e)
{
if (!string.IsNullOrEmpty(e.QueryString["404"]))
{
//Resolve the path to virtual or app-relative for
string path = resolve404Path(e.QueryString["404"]);
//Resolve to virtual path
path = Util.PathUtils.ResolveAppRelative(path);
//Merge commands from the 404 querystring with ones from the original image.
ResizeSettings imageQuery = new ResizeSettings(e.QueryString);
imageQuery.Normalize();
imageQuery.Remove("404"); //Remove the 404 ref
ResizeSettings i404Query = new ResizeSettings(Util.PathUtils.ParseQueryString(path));
i404Query.Normalize();
//Overwrite new with old
foreach (string key in i404Query.Keys)
{
if (key != null)
{
imageQuery[key] = i404Query[key];
}
}
path = PathUtils.AddQueryString(PathUtils.RemoveQueryString(path), PathUtils.BuildQueryString(imageQuery));
//Redirect
context.Response.Redirect(path, true);
}
}
