private Dir422 TraverseToDirectory(Dir422 currentLocation, string[] uriPieces, WebRequest req)
{
File422 fileAtRoot = null;
//Iterate over all path parts until we get to the file or directory wanted
for (int item = 0; item < uriPieces.Length - 1; item++)
{
fileAtRoot = currentLocation.GetFile(uriPieces[item]);
if (fileAtRoot == null)
{
currentLocation = currentLocation.GetDir(uriPieces[item]);
if (currentLocation == null)
{
req.WriteNotFoundResponse("<html>404 File Not Found<br>" + "</html>");
}
}
else
{
break;
}
}
return(currentLocation);
}
private string BuildPath(Dir422 dir, File422 file)
{
Dir422 tempDir;
//Check if we are building a path for a file or a directory
if (file != null)
{
tempDir = file.Parent;
}
else
{
tempDir = dir;
}
List <string> pathItems = new List <string>();
if (tempDir.Parent != null)
{
//Work our way up the tree
while (tempDir.Parent.Parent != null)
{
pathItems.Add(tempDir.Name);
tempDir = tempDir.Parent;
}
}
string path = "";
//Are they accessing an item in the root directory?
if (pathItems.Count > 0)
{
path = "/files/" + pathItems[pathItems.Count - 1];
for (int i = pathItems.Count - 2; i > -1; i--)
{
path += "/" + pathItems[i];
}
}
else
{
if (file != null)
{
path = "/files/" + file.Name;
}
else
{
path = "/files/" + dir.Name;
}
}
return(path);
}
public override File422 CreateFile(string fileName)
{
if (!CheckValidName(fileName))
{
return(null);
}
File422 newFile = GetFile(fileName);
if (newFile == null)
{
newFile = new MemFSFile(fileName, this);
_files.Add(newFile);
}
return(newFile);
}
//Create a new file. If the file exists, set the length to 0.
public override File422 CreateFile(string fileName)
{
if (!CheckValidName(fileName))
{
return(null);
}
File422 newFile = null;
FileStream newFileStream = null;
if (File.Exists(fileName))
{
try
{
newFile = GetFile(fileName);
newFileStream = (FileStream)newFile.OpenReadWrite();
//Remove all existing contents
newFileStream.SetLength(0);
newFileStream.Close();
}
catch (Exception e)
{
newFile = null;
}
}
else
{
try
{
newFileStream = File.Create(_path + "/" + fileName);
newFile = new StdFSFile(_path + "/" + fileName);
newFileStream.Close();
}
catch (Exception e)
{
newFile = null;
}
}
return(newFile);
}
public virtual bool Contains(File422 file)
{
return(Contains(file.Parent));
}
public override void Handler(WebRequest req)
{
//If the request URI doesn't start with the proper service URI
if (!req.GetUri().StartsWith(this.ServiceURI, StringComparison.CurrentCulture))
{
throw new InvalidOperationException();
}
//Get Uri pieces
string[] uriPieces = GetUriPeices(req);
//Decode path
uriPieces = DecodePath(uriPieces);
//Get the root directory
Dir422 currentLocation = FileSystem.GetRoot();
//Handle PUT requests
if (req.GetHTTPType() == "PUT")
{
FileStream newFileStream = null;
try
{
currentLocation = TraverseToDirectory(currentLocation, uriPieces, req);
if (currentLocation.ContainsFile(uriPieces[uriPieces.Length - 1], false) == true)
{
req.WriteNotFoundResponse("<html>File Already Exists!</html>");
}
else
{
File422 newFile = currentLocation.CreateFile(uriPieces[uriPieces.Length - 1]);
newFileStream = (FileStream)newFile.OpenReadWrite();
CopyBytes(req.GetBody(), newFileStream, req.GetBody().Length);
newFileStream.Close();
string response = "<html>File Uploaded!</html>";
string header = string.Format(putHeaderTemplate, req.GetHTTPVersion(), "text/html", response.Length);
req.WriteHTMLResponse(header + response);
}
}
catch (Exception e)
{
if (newFileStream != null)
{
newFileStream.Close();
}
}
}
//Handle GET requests
else
{
//If we're at the root directory, respond with a list
if (uriPieces.Length == 0)
{
string response = BuildDirHTML(FileSystem.GetRoot());
string header = string.Format(dirHeaderTemplate, req.GetHTTPVersion(), "text/html", response.Length);
req.WriteHTMLResponse(header + response);
}
else
{
currentLocation = TraverseToDirectory(currentLocation, uriPieces, req);
//If the wanted item is a file, respond with a file
if (currentLocation.GetFile(uriPieces[uriPieces.Length - 1]) != null)
{
//If we have a range header, we need to use a partial response header
if (req.GetHeaders().ContainsKey("range"))
{
string header = GetRangeHeader(req, currentLocation, uriPieces);
req.WriteHTMLResponse(header);
}
//Write repsonse for displaying file contents
else
{
Stream selectedFile = currentLocation.GetFile(uriPieces[uriPieces.Length - 1]).OpenReadOnly();
string header = string.Format(fileHeaderTemplate, req.GetHTTPVersion(), GetContentType(currentLocation.GetFile(uriPieces[uriPieces.Length - 1]).Name), selectedFile.Length);
selectedFile.Close();
req.WriteHTMLResponse(header);
}
BuildFileHTML(currentLocation.GetFile(uriPieces[uriPieces.Length - 1]), req);
}
//If the wanted item is a directory, respond with a directory listing
else
{
//Write response for displaying directory
if (currentLocation.GetDir(uriPieces[uriPieces.Length - 1]) != null)
{
string response = BuildDirHTML(currentLocation.GetDir(uriPieces[uriPieces.Length - 1]));
string header = string.Format(dirHeaderTemplate, req.GetHTTPVersion(), "text/html", response.ToString().Length);
req.WriteHTMLResponse(header + response);
}
//Request item could not be found
else
{
req.WriteNotFoundResponse("<html>404 File Not Found<br>" + "</html>");
}
}
}
}
}
private void BuildFileHTML(File422 File, WebRequest req)
{
long start = 0,
end = -1;
Stream fileStream = File.OpenReadOnly();
//Do we have a range header? Set the bounds
if (req.GetHeaders().ContainsKey("range"))
{
string value = "";
req.GetHeaders().TryGetValue("range", out value);
if (value != "")
{
value = value.Substring(6);
string[] nums = value.Split('-');
long.TryParse(nums[0], out start);
long.TryParse(nums[1], out end);
for (int i = 0; i < nums.Length; i++)
{
if (nums[i].Contains("\r\n"))
{
nums[i] = nums[i].Substring(0, nums[i].LastIndexOf("\r\n"));
}
}
if (end == 0 && nums[1] == string.Empty)
{
end = fileStream.Length;
nums[1] = end.ToString();
}
fileStream.Seek(start, SeekOrigin.Begin);
if (end > fileStream.Length)
{
end = (int)fileStream.Length;
}
if (end < 0)
{
start = 0;
end = 0;
}
if (start > fileStream.Length)
{
start = 0;
end = 0;
}
if (start < 0)
{
start = 0;
}
}
}
//No range header? Set the bounds to 0 an length
else
{
start = 0;
end = (int)fileStream.Length;
}
CopyBytes(fileStream, req.GetBody(), end - start);
fileStream.Close();
}
