public ActionResult DeleteAssignmentFile(int courseID, int assignmentID, string fileName)
{
//Get the filename from the path
fileName = System.IO.Path.GetFileName(fileName);
// Get the attributable file storage
OSBLEDirectory attrFiles =
OSBLE.Models.FileSystem.Directories.GetAssignment(courseID, assignmentID).AttributableFiles;
//If no files exist return to the assignment details page.
if (null == attrFiles)
{
return(Index(assignmentID));
}
if (fileName != null)
{
int slashIndex = fileName.LastIndexOf('\\');
if (-1 == slashIndex)
{
slashIndex = fileName.LastIndexOf('/');
}
if (-1 != slashIndex)
{
// If the file exists in some nested folders then get the
// correct directory object first.
attrFiles = (OSBLEDirectory)attrFiles.GetDir(fileName.Substring(0, slashIndex));
// Also remove the path from the beginning of the file name
fileName = fileName.Substring(slashIndex + 1);
}
}
// Perform the actual deletion
attrFiles.DeleteFile(fileName);
//Return to the assignment details page
return(Index(assignmentID));
}
public ActionResult CourseDocument(int courseId, string filePath)
{
var course = (from c in db.CourseUsers
where c.UserProfileID == CurrentUser.ID && c.AbstractCourseID == courseId
select c).FirstOrDefault();
if (course != null)
{
//build the file path
string[] pathPieces = filePath.Split('/');
OSBLEDirectory fsPath = Models.FileSystem.Directories.GetCourseDocs(courseId);
for (int i = 0; i < pathPieces.Length - 1; i++)
{
fsPath = fsPath.GetDir(pathPieces[i]);
}
string fullPath = fsPath.File(pathPieces[pathPieces.Length - 1]).FirstOrDefault();
string fileName = Path.GetFileName(fullPath);
//if the file ends in a ".link", then we need to treat it as a web link
if (Path.GetExtension(fileName).ToLower().CompareTo(".link") == 0)
{
string url = "";
//open the file to get at the link stored inside
using (TextReader tr = new StreamReader(fullPath))
{
url = tr.ReadLine();
}
Response.Redirect(url);
//this will never be reached, but the function requires an actionresult to be returned
return(new EmptyResult());
}
else
{
Stream fileStream = null;
try
{
fileStream = fsPath.File(pathPieces[pathPieces.Length - 1]).ToStreams().FirstOrDefault().Value;
}
catch (Exception)
{
//file not found
}
if (fileStream == null)
{
return(RedirectToAction("Index", "Home"));
}
//else just return the file
if (Path.GetExtension(filePath).ToLower() == ".pdf")
{
Response.AppendHeader("content-disposition", "inline; filename=" + fileName);
return(new FileStreamResult(fileStream, "application/pdf"));
}
else
{
return(new FileStreamResult(fileStream, "application/octet-stream")
{
FileDownloadName = fileName
});
}
}
}
return(RedirectToAction("Index", "Home"));
}
private void HandleFileDeletionRequest(HttpContext context,
Models.Users.UserProfile up, int courseID)
{
// Make sure they have access to this course. Right now we only let
// people who can modify the course have access to this service function.
if (!VerifyModifyPermissions(context, up, courseID))
{
return;
}
// The permission-oriented attributes depend on the course user
OSBLEContext db = new OSBLEContext();
CourseUser courseUser =
(from cu in db.CourseUsers
where cu.UserProfileID == up.ID &&
cu.AbstractCourse is AbstractCourse &&
cu.AbstractCourseID == courseID
select cu).FirstOrDefault();
if (null == courseUser)
{
WriteErrorResponse(context,
"User does not have permission to view or modify files in this course.");
return;
}
// Make sure the file name parameter is present
string fileName = string.Empty;
if (!VerifyStringParam(context, "file_name", ref fileName))
{
return;
}
if (string.IsNullOrEmpty(fileName))
{
WriteErrorResponse(context,
"The following parameter cannot be an empty string: file_name");
return;
}
// Make sure the file path name is OK (doesn't go up a level with ../ or
// other things like that)
if (!VerifyPath(context, ref fileName))
{
return;
}
// Get the attributable file storage
OSBLEDirectory courseFiles =
Models.FileSystem.Directories.GetCourseDocs(courseID);
OSBLEDirectory attrFiles = courseFiles;
if (null == attrFiles)
{
WriteErrorResponse(context,
"Internal error: could not get attributable files manager for course files.");
return;
}
int slashIndex = fileName.LastIndexOf('\\');
if (-1 == slashIndex)
{
slashIndex = fileName.LastIndexOf('/');
}
if (-1 != slashIndex)
{
// If the file exists in some nested folders then get the
// correct directory object first.
attrFiles = (OSBLEDirectory)attrFiles.GetDir(fileName.Substring(0, slashIndex));
// Also remove the path from the beginning of the file name
fileName = fileName.Substring(slashIndex + 1);
}
// Perform the actual deletion
attrFiles.DeleteFile(fileName);
// Return success message with new file listing
context.Response.Write(
"<CourseFilesOpsResponse success=\"true\">" +
courseFiles.GetXMLListing(courseUser, true) +
"</CourseFilesOpsResponse>");
}
private void HandleFileRenameRequest(HttpContext context, Models.Users.UserProfile up,
int courseID, CourseUser courseUser)
{
// Make sure they have access to this course. Right now we only let
// people who can modify the course have access to this service function.
if (!VerifyModifyPermissions(context, up, courseID))
{
return;
}
// Make sure the file name parameter is present
string fileName = string.Empty;
if (!VerifyStringParam(context, "file_name", ref fileName))
{
return;
}
if (string.IsNullOrEmpty(fileName))
{
WriteErrorResponse(context,
"The following parameter cannot be an empty string: file_name");
return;
}
// Make sure the path name is OK
if (!VerifyPath(context, ref fileName))
{
return;
}
// Get the attributable file storage
OSBLEDirectory courseFiles =
Models.FileSystem.Directories.GetCourseDocs(courseID);
OSBLEDirectory attrFiles = courseFiles;
if (null == attrFiles)
{
WriteErrorResponse(context,
"Internal error: could not get attributable files manager for course files.");
return;
}
int slashIndex = fileName.LastIndexOf('\\');
if (-1 == slashIndex)
{
slashIndex = fileName.LastIndexOf('/');
}
if (-1 != slashIndex)
{
// If the file exists in some nested folders then get the
// correct directory object first.
attrFiles = (OSBLEDirectory)attrFiles.GetDir(fileName.Substring(0, slashIndex));
// Also remove the path from the beginning of the file name
fileName = fileName.Substring(slashIndex + 1);
}
// Now make sure we have the new_name parameter
string newName = string.Empty;
if (!VerifyStringParam(context, "new_name", ref newName))
{
return;
}
// Verify that it's OK
if (!VerifyPath(context, ref newName))
{
return;
}
// Also it must be just the new file name and not have / or \
if (newName.Contains('/') || newName.Contains('\\'))
{
WriteErrorResponse(context,
"New file name must not contain a path, just the new file name.");
return;
}
// Lastly, it must not be empty
if (string.IsNullOrEmpty(newName))
{
WriteErrorResponse(context,
"New file name cannot be empty.");
return;
}
// Tell the file storage to do the rename
if (attrFiles.RenameFile(fileName, newName))
{
// Return success message with new file listing
context.Response.Write(
"<CourseFilesOpsResponse success=\"true\">" +
courseFiles.GetXMLListing(courseUser, true) +
"</CourseFilesOpsResponse>");
}
else
{
WriteErrorResponse(context, "Failed to rename file.");
}
}
public void ProcessRequest(HttpContext context)
{
HttpFileCollection coll;
//yc: set the max upload size
try
{
coll = context.Request.Files;
context.Response.ContentType = "text/xml";
if (0 == coll.Count)
{
WriteErrorResponse(context,
"Course file upload service requires one or more files in the request. " +
"It's possible that your browser did not correctly send the file data " +
"and you may need to update your browser if the problem persists.");
return;
}
// We're expecting the course ID to be in a parameter (required)
string courseIDParam = context.Request.Params["courseID"];
if (string.IsNullOrEmpty(courseIDParam))
{
WriteErrorResponse(context,
"Course file upload service requires a \"courseID\" parameter.");
return;
}
// Make sure the course ID is an integer and a valid course ID at that
int courseID;
if (!int.TryParse(courseIDParam, out courseID))
{
WriteErrorResponse(context,
"The course ID must be a valid integer value.");
return;
}
// There might be an optional "target_folder" parameter
string targetFolderParam = context.Request.Params["target_folder"];
// Try to get the current OSBLE user
Models.Users.UserProfile up = OSBLE.Utility.OsbleAuthentication.CurrentUser;
if (null == up)
{
// In the future what I'd like to do here is look for a user name and
// password in the request headers. This would allow this web service to
// be used by other sources, but for now it requires a logged in OSBLE user.
WriteErrorResponse(context,
"Could not get active OSBLE user for request. Please login.");
return;
}
// Make sure this user has permission to upload to this course
OSBLEContext _db = new OSBLEContext();
CourseUser courseUser = (
from cu in _db.CourseUsers
where cu.UserProfileID == up.ID
&&
cu.AbstractCourse is AbstractCourse
&&
cu.AbstractCourseID == courseID
select cu
).FirstOrDefault();
if (null == courseUser || !courseUser.AbstractRole.CanUploadFiles)
{
// User cannot upload files for this course
context.Response.Write(
"<CourseFilesUploaderResponse success=\"false\">" +
" <Message>The specified user does not have access to course with ID=" +
courseID.ToString() + ". User must be " +
"a course owner to access this service.</Message>" +
"</CourseFilesUploaderResponse>");
return;
}
// We will look for an optional "fileusage" parameter that tells us where
// the file(s) will go. By default we use "generic" if the parameter is
// absent.
string fileUsage = context.Request.Params["fileusage"];
if (string.IsNullOrEmpty(fileUsage))
{
// Default to "generic", which puts files in the CourseDocs folder.
fileUsage = "generic";
}
else
{
fileUsage = fileUsage.ToLower();
}
// Save based on the usage
if ("generic" == fileUsage)
{
OSBLEDirectory location = Models.FileSystem.Directories.GetCourseDocs(courseID);
// For now the target folder parameter is only allowed for generic files
if (!string.IsNullOrEmpty(targetFolderParam) &&
"\\" != targetFolderParam &&
"/" != targetFolderParam)
{
// We can't let it start with / or \
while (targetFolderParam.StartsWith("\\"))
{
targetFolderParam = targetFolderParam.Substring(1);
}
while (targetFolderParam.StartsWith("/"))
{
targetFolderParam = targetFolderParam.Substring(1);
}
location = location.GetDir(targetFolderParam);
if (null == location)
{
WriteErrorResponse(context,
"Could not upload to target folder: " + targetFolderParam);
return;
}
}
// Save each file to the target directory
for (int i = 0; i < coll.Count; i++)
{
HttpPostedFile postedFile = coll[i];
//yc: check the file size in MB
int size = postedFile.ContentLength / 1024 / 1024; //contentLenght(BYTES)/ 1024 (gets KB) / 1024 (GETS MB)
if (size < 30)
{
}
else
{
//too large
}
string fileName = Path.GetFileName(postedFile.FileName);
location.AddFile(fileName, postedFile.InputStream);
}
context.Response.Write(string.Format(
"<CourseFilesUploaderResponse success=\"true\">" +
" <Message>Successfully uploaded {0} files</Message>" +
"</CourseFilesUploaderResponse>", coll.Count));
return;
}
else if ("assignment_description" == fileUsage ||
"assignment_solution" == fileUsage)
{
// In this case we also need an assignment ID parameter
string aIDString = context.Request.Params["assignmentID"];
if (string.IsNullOrEmpty(aIDString))
{
WriteErrorResponse(context,
"An \"assignmentID\" parameter is required when uploading a " +
"file for an assignment " +
(("assignment_description" == fileUsage) ? "description." : "solution."));
return;
}
int aID;
if (!int.TryParse(aIDString, out aID))
{
WriteErrorResponse(context,
"The \"assignmentID\" parameter must be an integer value.");
return;
}
// Assignment must exist
Models.FileSystem.AssignmentFilePath afs =
Models.FileSystem.Directories.GetAssignment(courseID, aID);
if (null == afs)
{
WriteErrorResponse(context,
"Could not get assignment file path for assignment: " + aIDString);
return;
}
// Get the attributable files storage for this assignment
OSBLE.Models.FileSystem.OSBLEDirectory attrFiles = afs.AttributableFiles;
if (null == attrFiles)
{
WriteErrorResponse(context,
"Internal error: could not get attributable files manager for assignment");
return;
}
// Set up the system attributes for this file
Dictionary <string, string> sys = new Dictionary <string, string>();
sys.Add("created", DateTime.Now.ToString());
sys.Add(fileUsage, aIDString);
sys.Add("uploadedby", up.UserName);
if ("assignment_solution" != fileUsage)
{
sys.Add("any_course_user_can_download", null);
}
// Save each file to the target directory
for (int i = 0; i < coll.Count; i++)
{
HttpPostedFile postedFile = coll[i];
string fileName = Path.GetFileName(postedFile.FileName);
attrFiles.AddFile(fileName, postedFile.InputStream, sys, null);
}
context.Response.Write(string.Format(
"<CourseFilesUploaderResponse success=\"true\">" +
" <Message>Successfully uploaded {0} files</Message>" +
"</CourseFilesUploaderResponse>", coll.Count));
return;
}
// Coming here implies we didn't recognize the file usage
WriteErrorResponse(context, "Unsupported file usage: " + fileUsage);
}
catch (HttpException ex)
{
if (ex.WebEventCode == 3004)
{
WriteErrorResponse(context, "File exceeds 30MB upload limit");
return;
}
}
// This web service returns XML
}
