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using System;
using System.Threading.Tasks;
using SimpleStack.Interfaces;
using SimpleStack.Logging;
using System.IO;
using SimpleStack.Extensions;
using System.Collections.Generic;
using SimpleStack.Tools;
namespace SimpleStack.Handlers
{
class StaticFileHandler : ISimpleStackHttpHandler
{
private static readonly ILog log = Logger.CreateLog();
// public void ProcessRequest(HttpContext context)
// {
// ProcessRequest(
// new HttpRequestWrapper(null, context.Request),
// new HttpResponseWrapper(context.Response),
// null);
// }
private DateTime DefaultFileModified { get; set; }
private string DefaultFilePath { get; set; }
private byte[] DefaultFileContents { get; set; }
/// <summary>
/// Keep default file contents in-memory
/// </summary>
/// <param name="defaultFilePath"></param>
public void SetDefaultFile(string defaultFilePath)
{
try
{
this.DefaultFileContents = File.ReadAllBytes(defaultFilePath);
this.DefaultFilePath = defaultFilePath;
this.DefaultFileModified = File.GetLastWriteTime(defaultFilePath);
}
catch (Exception ex)
{
log.Error(ex.Message, ex);
}
}
public void ProcessRequest(IHttpRequest request, IHttpResponse response, string operationName)
{
response.EndHttpRequest(skipClose: true, afterBody: r => {
var fileName = request.GetPhysicalPath();
var fi = new FileInfo(fileName);
if (!fi.Exists)
{
if ((fi.Attributes & FileAttributes.Directory) != 0)
{
foreach (var defaultDoc in EndpointHost.Config.DefaultDocuments)
{
var defaultFileName = Path.Combine(fi.FullName, defaultDoc);
if (!File.Exists(defaultFileName)) continue;
r.Redirect(request.GetPathUrl() + '/' + defaultDoc);
return;
}
}
if (!fi.Exists)
{
var originalFileName = fileName;
if (Env.IsMono)
{
//Create a case-insensitive file index of all host files
if (allFiles == null)
allFiles = CreateFileIndex(request.ApplicationFilePath);
if (allDirs == null)
allDirs = CreateDirIndex(request.ApplicationFilePath);
if (allFiles.TryGetValue(fileName.ToLower(), out fileName))
{
fi = new FileInfo(fileName);
}
}
if (!fi.Exists)
{
var msg = "Static File '" + request.PathInfo + "' not found.";
log.WarnFormat("{0} in path: {1}", msg, originalFileName);
throw new HttpError(404, msg);
}
}
}
TimeSpan maxAge;
if (r.ContentType != null && EndpointHost.Config.AddMaxAgeForStaticMimeTypes.TryGetValue(r.ContentType, out maxAge))
{
r.AddHeader(HttpHeaders.CacheControl, "max-age=" + maxAge.TotalSeconds);
}
if (request.HasNotModifiedSince(fi.LastWriteTime))
{
r.ContentType = MimeTypes.GetMimeType(fileName);
r.StatusCode = 304;
return;
}
try
{
r.AddHeaderLastModified(fi.LastWriteTime);
r.ContentType = MimeTypes.GetMimeType(fileName);
if (fileName.EqualsIgnoreCase(this.DefaultFilePath))
{
if (fi.LastWriteTime > this.DefaultFileModified)
SetDefaultFile(this.DefaultFilePath); //reload
r.OutputStream.Write(this.DefaultFileContents, 0, this.DefaultFileContents.Length);
r.Close();
return;
}
if (EndpointHost.Config.AllowPartialResponses)
r.AddHeader(HttpHeaders.AcceptRanges, "bytes");
long contentLength = fi.Length;
long rangeStart, rangeEnd;
var rangeHeader = request.Headers[HttpHeaders.Range];
if (EndpointHost.Config.AllowPartialResponses && rangeHeader != null)
{
rangeHeader.ExtractHttpRanges(contentLength, out rangeStart, out rangeEnd);
r.AddHttpRangeResponseHeaders(rangeStart: rangeStart, rangeEnd: rangeEnd, contentLength: contentLength);
}
else
{
rangeStart = 0;
rangeEnd = contentLength - 1;
r.SetContentLength(contentLength); //throws with ASP.NET webdev server non-IIS pipelined mode
}
var outputStream = r.OutputStream;
using (var fs = fi.OpenRead())
{
if (rangeStart != 0 || rangeEnd != fi.Length - 1)
{
fs.WritePartialTo(outputStream, rangeStart, rangeEnd);
}
else
{
fs.WriteTo(outputStream);
outputStream.Flush();
}
}
}
catch (System.Net.HttpListenerException ex)
{
if (ex.ErrorCode == 1229)
return;
//Error: 1229 is "An operation was attempted on a nonexistent network connection"
//This exception occures when http stream is terminated by web browser because user
//seek video forward and new http request will be sent by browser
//with attribute in header "Range: bytes=newSeekPosition-"
throw;
}
catch (Exception ex)
{
log.ErrorFormat("Static file {0} forbidden: {1}", request.PathInfo, ex.Message);
throw new HttpError(403, "Forbidden.");
}
});
}
static Dictionary<string, string> CreateFileIndex(string appFilePath)
{
log.Debug("Building case-insensitive fileIndex for Mono at: "
+ appFilePath);
var caseInsensitiveLookup = new Dictionary<string, string>();
foreach (var file in GetFiles(appFilePath))
{
caseInsensitiveLookup[file.ToLower()] = file;
}
return caseInsensitiveLookup;
}
static Dictionary<string, string> CreateDirIndex(string appFilePath)
{
var indexDirs = new Dictionary<string, string>();
foreach (var dir in GetDirs(appFilePath))
{
indexDirs[dir.ToLower()] = dir;
}
return indexDirs;
}
public bool IsReusable
{
get { return true; }
}
public static bool DirectoryExists(string dirPath, string appFilePath)
{
if (dirPath == null) return false;
try
{
if (!Env.IsMono)
return Directory.Exists(dirPath);
}
catch
{
return false;
}
if (allDirs == null)
allDirs = CreateDirIndex(appFilePath);
var foundDir = allDirs.ContainsKey(dirPath.ToLower());
//log.DebugFormat("Found dirPath {0} in Mono: ", dirPath, foundDir);
return foundDir;
}
private static Dictionary<string, string> allDirs; //populated by GetFiles()
private static Dictionary<string, string> allFiles;
static IEnumerable<string> GetFiles(string path)
{
var queue = new Queue<string>();
queue.Enqueue(path);
while (queue.Count > 0)
{
path = queue.Dequeue();
try
{
foreach (string subDir in Directory.GetDirectories(path))
{
queue.Enqueue(subDir);
}
}
catch (Exception ex)
{
Console.Error.WriteLine(ex);
}
string[] files = null;
try
{
files = Directory.GetFiles(path);
}
catch (Exception ex)
{
Console.Error.WriteLine(ex);
}
if (files != null)
{
for (int i = 0; i < files.Length; i++)
{
yield return files[i];
}
}
}
}
static List<string> GetDirs(string path)
{
var queue = new Queue<string>();
queue.Enqueue(path);
var results = new List<string>();
while (queue.Count > 0)
{
path = queue.Dequeue();
try
{
foreach (string subDir in Directory.GetDirectories(path))
{
queue.Enqueue(subDir);
results.Add(subDir);
}
}
catch (Exception ex)
{
Console.Error.WriteLine(ex);
}
}
return results;
}
}
}