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);
}
//Create a new directory. If the directory exists then just return
//an instance of it.
public override Dir422 CreateDir(string dirName)
{
if (!CheckValidName(dirName))
{
return(null);
}
Dir422 newDir = null;
if (Directory.Exists(_path + "/" + dirName))
{
newDir = GetDir(dirName);
}
else
{
try
{
Directory.CreateDirectory(_path + "/" + dirName);
newDir = new StdFSDir(_path + "/" + dirName);
}
catch (Exception e)
{
newDir = null;
}
}
return(newDir);
}
private string BuildDirHTML(Dir422 Dir)
{
var html = new System.Text.StringBuilder("<html>");
html.AppendLine(@"<script>
function selectedFileChanged(fileInput, urlPrefix) {
document.getElementById('uploadHdr').innerText = 'Uploading ' + fileInput.files[0].name + '...';
// Need XMLHttpRequest to do the upload
if (!window.XMLHttpRequest)
{
alert('Your browser does not support XMLHttpRequest. Please update your browser.');
return;
}
// Hide the file selection controls while we upload
var uploadControl = document.getElementById('uploader');
if (uploadControl)
{
uploadControl.style.visibility = 'hidden';
}
// Build a URL for the request
if (urlPrefix.lastIndexOf('/') != urlPrefix.length - 1)
{
urlPrefix += '/';
}
var uploadURL = urlPrefix + fileInput.files[0].name;
// Create the service request object
var req = new XMLHttpRequest();
req.open('PUT', uploadURL);
req.onreadystatechange = function() {
document.getElementById('uploadHdr').innerText = 'Upload (request status == ' + req.status + ')';
location.reload();
document.getElementById('responseMessage').innerHTML= req.responseText;
};
req.send(fileInput.files[0]);
}
</script> " );
//Add all filenames and links
html.AppendLine("<h1>Files</h1>");
foreach (File422 file in Dir.GetFiles())
{
string encodedName = file.Name.Replace("#", "%23");
html.AppendFormat("<a href=\"{0}\">{1}</a><br>", BuildPath(null, file) + "/" + encodedName, file.Name);
}
//Add all directories and links
html.AppendLine("<br><h1>Directories</h1>");
foreach (Dir422 dir in Dir.GetDirs())
{
html.AppendFormat("<a href=\"{0}\">{1}</a><br>", BuildPath(dir, null), dir.Name);
}
html.AppendFormat("<hr><h3 id='uploadHdr'>Upload</h3><br>" +
"<input id=\"uploader\" type='file' " + "onchange='selectedFileChanged(this,\"{0}\")' /><h2 id='responseMessage'></h2><hr>", BuildPath(Dir, null));
//Close page tags
html.AppendLine("</html>");
return(html.ToString());
}
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 virtual bool Contains(Dir422 dir)
{
Dir422 parent = dir.Parent;
while (parent.Parent != null)
{
parent = parent.Parent;
}
if (parent == GetRoot())
{
return(true);
}
return(false);
}
public override Dir422 CreateDir(string dirName)
{
if (!CheckValidName(dirName))
{
return(null);
}
Dir422 newDir = GetDir(dirName);
if (newDir == null)
{
newDir = new MemFSDir(dirName, this);
_directories.Add(newDir);
}
return(newDir);
}
private string GetRangeHeader(WebRequest req, Dir422 currentLocation, string[] uriPieces)
{
string header = "";
string value = "";
req.GetHeaders().TryGetValue("range", out value);
value = value.Substring(6);
string[] nums = value.Split('-');
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"));
}
}
Stream selectedFile = currentLocation.GetFile(uriPieces[uriPieces.Length - 1]).OpenReadOnly();
long a, b;
long.TryParse(nums[0], out a);
long.TryParse(nums[1], out b);
if (b == 0 && nums[1] == string.Empty)
{
b = (int)selectedFile.Length;
nums[1] = b.ToString();
}
long length = b - a;
if (b == selectedFile.Length)
{
b = b - 1;
}
header = string.Format(partialFileHeaderTemplate, req.GetHTTPVersion(), GetContentType(currentLocation.GetFile(uriPieces[uriPieces.Length - 1]).Name), a, b, selectedFile.Length, length);
selectedFile.Close();
return(header);
}
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>");
}
}
}
}
}
