private bool ShouldServeThisFile(
IOwinContext context,
out StaticFileContext fileContext)
{
// Capture the configuration because it can change at any time
fileContext = new StaticFileContext
{
Configuration = _configuration,
RootFolder = _rootFolder,
RootUrl = _rootUrl
};
if (!string.Equals(context.Request.Method, "GET", StringComparison.OrdinalIgnoreCase))
{
_traceFilter.Trace(context, TraceLevel.Debug, () => GetType().Name + " only handles GET requests");
return(false);
}
var request = context.Request;
if (!_configuration.Enabled)
{
_traceFilter.Trace(context, TraceLevel.Error, () => GetType().Name + " is disabled and will not serve this request");
return(false);
}
if (!request.Path.HasValue)
{
_traceFilter.Trace(context, TraceLevel.Error, () => GetType().Name + " can not serve this request because the request path is empty");
return(false);
}
if (!fileContext.RootUrl.HasValue)
{
_traceFilter.Trace(context, TraceLevel.Error, () => GetType().Name + " will not handle this request because the configured root URL is empty");
return(false);
}
if (!(fileContext.RootUrl.Value == "/" || request.Path.StartsWithSegments(fileContext.RootUrl)))
{
_traceFilter.Trace(context, TraceLevel.Debug, () => GetType().Name + " will not handle this request because the file is not in a sub-directory of the configured root");
return(false);
}
// Extract the path relative to the root UI
var relativePath = request.Path.Value.Substring(fileContext.RootUrl.Value.Length);
var fileName = relativePath.Replace('/', '\\');
// No filename case can't be handled by this middleware
if (string.IsNullOrWhiteSpace(fileName) || fileName == "\\")
{
_traceFilter.Trace(context, TraceLevel.Error, () => GetType().Name + " will not handle this request because the file name is blank");
return(false);
}
if (fileName.StartsWith("\\"))
{
fileName = fileName.Substring(1);
}
if (!fileContext.Configuration.IncludeSubFolders && fileName.Contains("\\"))
{
_traceFilter.Trace(context, TraceLevel.Error, () => GetType().Name + " will not handle this request because it is configured to not serve files from sub-folders");
return(false);
}
// Parse out pieces of the file name
var lastPeriodIndex = fileName.LastIndexOf('.');
var extension = lastPeriodIndex < 0 ? "" : fileName.Substring(lastPeriodIndex);
// Get the configuration appropriate to this file extension
fileContext.ExtensionConfiguration = fileContext.Configuration.FileExtensions
.FirstOrDefault(c => string.Equals(c.Extension, extension, StringComparison.OrdinalIgnoreCase));
// Only serve files that have their extensions confgured
if (fileContext.ExtensionConfiguration == null)
{
_traceFilter.Trace(context, TraceLevel.Error, () => GetType().Name + " will not handle this request because " + extension + " file extensions are not configured");
return(false);
}
fileContext.PhysicalFile = new FileInfo(Path.Combine(fileContext.RootFolder, fileName));
var file = fileContext.PhysicalFile;
fileContext.FileExists = file.Exists;
if (fileContext.FileExists)
{
_traceFilter.Trace(context, TraceLevel.Information, () => GetType().Name + " this is a request for static file " + file);
}
else
{
_traceFilter.Trace(context, TraceLevel.Information, () => GetType().Name + " static file '" + file + "' does not exist on disk");
}
return(fileContext.FileExists);
}
