/// <summary>
/// Process the posted data before it is saved by the shared code. This allows checking the file attachments
/// and making sure they meet the requirements of the SlkSettings.
/// </summary>
public bool ProcessPostedData(LearningSession session, HttpRequest request, Dictionary <string, HttpPostedFile> files)
{
// Save initial value of FinalPoints
m_initialTotalPoints = session.TotalPoints;
// Check the files for validity and fill in the output collection
HttpFileCollection attachedFiles = Request.Files;
int numFilesAttached = attachedFiles.Count;
if (numFilesAttached > 0)
{
// Check if posted data meets requirements in SlkSettings. Additionally, check if there are files
// that refer to files that do not exist (i.e. have 0 length).
int maxKb = SlkStore.Settings.MaxAttachmentKilobytes;
ICollection <string> attachmentTypes = SlkStore.Settings.ApprovedAttachmentTypes;
List <string> invalidFileAttachments = new List <string>(numFilesAttached);
List <string> invalidFileSize = new List <string>(numFilesAttached);
List <string> filesDontExist = new List <string>(numFilesAttached);
// Keep track of whether there is at least
bool hasInvalidFileAttachment = false;
bool hasInvalidFileSize = false;
bool fileExists = true;
// Go through posted files and test if they meet requirements
foreach (string fileKey in attachedFiles)
{
HttpPostedFile file = attachedFiles[fileKey];
bool fileIsValid = true; // is this file a valid file attachment?
string filename = file.FileName;
// If the filename is empty, the file wasn't actually attached.
if (!String.IsNullOrEmpty(filename))
{
if (file.ContentLength == 0)
{
filesDontExist.Add(filename);
fileExists = false;
fileIsValid = false;
}
else if ((file.ContentLength / 1024) > maxKb)
{
invalidFileSize.Add(filename);
hasInvalidFileSize = true;
fileIsValid = false;
}
if (!attachmentTypes.Contains(Path.GetExtension(filename)))
{
invalidFileAttachments.Add(filename);
hasInvalidFileAttachment = true;
fileIsValid = false;
}
}
// else: The file was valid on a previous posting, so consider it valid here
if (fileIsValid)
{
// Add it to the returned list of valid files
files.Add(fileKey, file);
}
}
// if any of the posted files are invalid, then we need to write the message
if (hasInvalidFileSize || hasInvalidFileAttachment || !fileExists)
{
StringBuilder message = new StringBuilder(1000);
if (hasInvalidFileAttachment)
{
message.Append(ResHelper.GetMessage(SlkFrameset.CON_InvalidFileExtensionMsgHtml));
message.Append("<br><br><ul>");
foreach (string filename in invalidFileAttachments)
{
message.AppendFormat("<li>{0}</li>", SlkUtilities.GetHtmlEncodedText(filename));
}
message.Append("</ul>");
}
if (hasInvalidFileSize)
{
message.AppendFormat(ResHelper.GetMessage(SlkFrameset.CON_MaxFileSizeExceededMsgHtml, Convert.ToString(maxKb, CultureInfo.CurrentCulture.NumberFormat)));
message.Append("<br><br><ul>");
foreach (string filename in invalidFileSize)
{
message.AppendFormat("<li>{0}</li>", SlkUtilities.GetHtmlEncodedText(filename));
}
message.Append("</ul>");
}
if (!fileExists)
{
message.AppendFormat(SlkFrameset.CON_FilesDontExistHtml);
message.Append("<br><br><ul>");
foreach (string filename in filesDontExist)
{
message.AppendFormat("<li>{0}</li>", SlkUtilities.GetHtmlEncodedText(filename));
}
message.Append("</ul>");
}
// If one of the cases that relates to SLK settings is true, then tell user that there are settings
// that affect the error
if (hasInvalidFileSize || hasInvalidFileAttachment)
{
message.AppendFormat(CultureInfo.InvariantCulture, "{0}<br><br>", ResHelper.GetMessage(SlkFrameset.CON_InvalidFileAttachmentMsgHtml));
}
message.Append(FramesetResources.CON_FileAttachmentErrorEndHtml);
// Add information for the 'Continue' link
JScriptString js = new JScriptString(ResHelper.FormatInvariant("API_GetFramesetManager().DoChoice(\"{0}\");",
FramesetUtil.GetStringInvariant(session.CurrentActivityId)));
message.AppendFormat(CultureInfo.InvariantCulture, "<br><br><a href='{0}' >{1}</a>",
js.ToJavascriptProtocol(), HttpUtility.HtmlEncode(FramesetResources.HID_ReloadCurrentContent));
RegisterError(SlkFrameset.CON_InvalidFileAttachmentTitleHtml, message.ToString(), false);
}
}
return(true);
}
