/// <summary>
/// Render a file attachment. File attachments will have a relativePath of the form:
/// .../~RLO/<interactionId>/<attachmentIndex>
/// </summary>
/// <param name="context"></param>
/// <param name="attachmentInfo">The portion of the path to the file after the "/~RLO" portion.</param>
/// <exception cref="FileNotFoundException">The requested file attachment can't be found.</exception>
private static void RenderFileAttachment(RloRenderContext context, string attachmentInfo)
{
AIResources.Culture = LocalizationManager.GetCurrentCulture();
// File attachments will have a relativePath of the form:
// .../~RLO/<interactionId>/<attachmentIndex>
//
// If it's a request to view a file attachment, then there will be extension data in the data model of the form:
// ms.learningcomponents.fileAttachment.<interactionId>.<attachmentIndex>
// find the /~RLO/ portion of the path, so that we can find the beginning of the <interactionId>/<attachmentIndex>
// part of the path.
// attachmentInfo should be of the form <interactionId>/<attachmentIndex>, so split it into the parts
string[] splitAttachmentInfo = attachmentInfo.Split(new char[] { '/' });
LearningDataModel learningDataModel = context.LearningDataModel;
//if(learningDataModel.Interactions.Contains(splitAttachmentInfo[0]))
if (learningDataModel.InteractionListContains(splitAttachmentInfo[0]))
{
//Interaction i = learningDataModel.Interactions[splitAttachmentInfo[0]];
Interaction i = learningDataModel.InteractionListElement(splitAttachmentInfo[0]);
string fileAttachmentKey = FileAttachmentKey(splitAttachmentInfo[1]);
if (i.ExtensionData.ContainsKey(fileAttachmentKey))
{
byte[] fileAttachment = (byte[])i.ExtensionData[fileAttachmentKey];
if (context.Response != null)
{
context.Response.Clear();
}
context.SetOutputStreamExtension((string)i.ExtensionData[FileAttachmentExtensionKey(splitAttachmentInfo[1])]);
context.WriteFileToResponse(fileAttachment);
return;
}
}
// couldn't get the file
throw new FileNotFoundException(AIResources.FileAttachmentNotFound);
}
/// <summary> /// Requests the RloHandler to modify the <c>RloHandlerContext.InputStream</c> and render the requested /// view to the <c>RloHandlerContext.OuputStream</c> /// </summary> /// <param name="context">The context within which to render the content.</param> public abstract void Render(RloRenderContext context);
/// <summary>
/// Requests the RloHandler to render the requested
/// view to the <c>RloHandlerContext.OuputStream</c>
/// </summary>
/// <param name="context"></param>
public override void Render(RloRenderContext context)
{
// This rlo handler does nothing to process the content, so just send the file
// to the response.
context.WriteFileToResponse(context.RelativePath);
}
/// <summary>
/// Output the current node, or the changes required to the current node by the rendering code, to the writer.
/// <img> nodes representing assessment items are handled elsewhere.
/// </summary>
private void HandleNode(HtmlTextReader reader, StreamWriter writer)
{
AIResources.Culture = LocalizationManager.GetCurrentCulture();
RloRenderContext context = AssessmentItemManager.RenderContext;
if (reader.NodeType == HtmlNodeType.Element)
{
if (IsNamed(reader, "body"))
{
const string ecs = " ECS_ViewType=\"{0}\" leftmargin=0 topmargin=0 rightmargin=0 bottommargin=0 ";
const string form = "<form NAME=\"{0}\" {1}METHOD=\"post\" ENCTYPE=\"multipart/form-data\" style=\"height:100%; width:100%; border:none; margin:0\">";
const string hidDetach = "<INPUT Name=\"hidDetach\" TYPE=\"HIDDEN\" value=\"0\">";
StringWriter bodyWriter = new StringWriter(CultureInfo.InvariantCulture);
reader.CopyNode(bodyWriter);
string body = bodyWriter.ToString();
bodyWriter.Close();
switch (context.View)
{
case SessionView.Execute:
// update the <body> to include ECS_ViewType attribute and margin attributes
body = body.Insert(5, String.Format(CultureInfo.InvariantCulture, ecs, "2"));
break;
case SessionView.RandomAccess:
// update the <body> to include ECS_ViewType attribute and margin attributes
body = body.Insert(5, String.Format(CultureInfo.InvariantCulture, ecs, "6"));
break;
case SessionView.Review:
// update the <body> to include ECS_ViewType attribute and margin attributes
body = body.Insert(5, String.Format(CultureInfo.InvariantCulture, ecs, "4"));
break;
}
writer.Write(body);
writer.Write(String.Format(CultureInfo.InvariantCulture,
form, "frmPage", " "));
writer.Write(hidDetach);
WriteFormHiddenControls(writer, context.FormHiddenControls);
return;
}
// if ShowReviewerInformation is false, check all table elements for a bgColor="#ff99cb"
// and remove them from display.
else if (!context.ShowReviewerInformation && IsNamed(reader, "table") && IsBgColorFF99CB(reader))
{
reader.Skip();
return;
}
}
else if (reader.NodeType == HtmlNodeType.EndElement)
{
// insert a script section before the </head>
if (IsNamed(reader, "head"))
{
switch (context.View)
{
case SessionView.Execute:
writer.Write(AIResources.HeadExecuteViewScript);
break;
case SessionView.RandomAccess:
// Security issue, FormElementId must be javascript safe.
writer.Write(m_headGradingViewScript.Replace("<%=FormId%>", "frmPage"));
break;
case SessionView.Review:
writer.Write(AIResources.ReviewViewScript);
break;
}
reader.CopyNode(writer);
return;
}
else if (IsNamed(reader, "body"))
{
// insert any RloRenderContext.ScriptToRender and the </form> before the </body>
if (!String.IsNullOrEmpty(context.ScriptToRender))
{
writer.WriteLine("<script>");
writer.WriteLine(context.ScriptToRender);
writer.WriteLine("</script>");
}
writer.Write("</form></body>");
return;
}
}
reader.CopyNode(writer);
}
/// <summary>
/// Render the requested view into the output stream.
/// </summary>
/// <param name="context">The context within which to render the page.</param>
/// <remarks>
/// When this method returns the <paramref name="context"/> OutputStream will contain
/// the rendered file.
/// <p>
/// The following methods and properties must be return valid values from
/// the <paramref name="context"/>:
/// <ul>
/// <li>EmbeddedUiResourcePath, must be non-null</li>
/// <li>FormElementId</li>
/// <li>GetInputStream</li>
/// <li>OutputStream</li>
/// <li>View</li>
/// </ul>
/// </p>
/// <p>
/// Additionally, if the following properties are set, they will be used:
/// <ul>
/// <li>FormElementAction</li>
/// <li>HiddenControls</li>
/// <li>ScriptToRender</li>
/// </ul>
/// </p>
/// All other properties on <paramref name="context"/> are ignored.
/// </remarks>
/// <exception cref="FileNotFoundException">The requested file attachment can't be found.</exception>
public override void Render(RloRenderContext context)
{
AIResources.Culture = LocalizationManager.GetCurrentCulture();
// string is the key (which is AssessmentItem.Id_AssessmentItem.Type)
// int is the ordinal (0 based) which is the number of times the key has been processed
Dictionary <string, int> assessmentItems = new Dictionary <string, int>();
// The most common case is that the file is in the package
Stream inputStream = null;
AssessmentItemManager.DataModelContext = context;
LearningDataModel learningDataModel = context.LearningDataModel;
try
{
int srcIndex; // represents the index of the "src" attribute on an <img> node.
// If this is the first time the page is being rendered, parse the page and determine
// the interactions on the page.
if (context.View == SessionView.Execute)
{
if (!GetPageHasBeenVisited(learningDataModel))
{
using (inputStream = context.GetInputStream())
{
// If the file being requested is the default file for the current activity,
if (context.IsResourceEntryPoint)
{
// find all the assessment items (<IMG> tags that contain the text "mslamrk" as part of the src attribute.)
using (HtmlTextReader reader = new HtmlTextReader(inputStream))
{
while (reader.Read())
{
if (IsAITag(reader, out srcIndex))
{
try
{
AssessmentItem ai = AssessmentItem.Parse(reader.GetAttributeValue(srcIndex));
AssessmentItemRenderer renderer = AssessmentItemManager.GetRenderer(ai);
renderer.TryAddToDataModel();
}
catch (FormatException)
{
// skip this one. This is mirrored below in the 2nd pass.
}
}
}
}
}
}
SetPageHasBeenVisited(learningDataModel);
}
}
// must get the input stream again since it may not be possible to seek back to the beginning
using (inputStream = context.GetInputStream())
{
if (context.Response != null)
{
// Clear the output response
context.Response.Clear();
}
// If the file being requested is the default file for the current activity,
if (context.IsResourceEntryPoint)
{
if (context.View == SessionView.Execute)
{
// Set ExitMode to suspend so that when a student exits the activity it is left in a suspended state.
// This way if the activity is reactivated, the student's previous answers are intact.
learningDataModel.NavigationRequest.ExitMode = ExitMode.Suspended;
}
DetachableStream detachable = new DetachableStream(context.OutputStream);
// Parse through the input stream again, this time rendering into the output as we go.
using (StreamWriter writer = new StreamWriter(detachable))
{
using (HtmlTextReader reader = new HtmlTextReader(inputStream))
{
while (reader.Read())
{
if (IsAITag(reader, out srcIndex))
{
try
{
AssessmentItem ai = AssessmentItem.Parse(reader.GetAttributeValue(srcIndex));
AssessmentItemRenderer renderer = AssessmentItemManager.GetRenderer(ai);
if (assessmentItems.ContainsKey(ai.RenderKey))
{
assessmentItems[ai.RenderKey] += 1;
}
else
{
assessmentItems.Add(ai.RenderKey, 0);
}
writer.Write(renderer.Render(assessmentItems[ai.RenderKey]).ToString());
}
catch (FormatException)
{
// skip this one. This is mirrored above in the 1st pass.
}
}
else
{
HandleNode(reader, writer);
}
}
}
// don't allow closing the StreamWriter to close the context.OutputStream.
writer.Flush();
detachable.Detach();
}
// set the response type
context.SetOutputStreamExtension(Path.GetExtension(context.RelativePath));
}
else
{
// for a non-entry-point file, copy the file directly to the output stream
context.WriteFileToResponse(context.RelativePath);
}
}
return;
}
catch (FileNotFoundException)
{
// This means the requested file is not in the package. That's not necessarily a problem, since it
// may be a request for an attachment.
}
// We got here because the file is not in the package. In that case, render it if it is a file attachment
int beginAttachmentInfo = context.RelativePath.IndexOf("/~RLO/", StringComparison.Ordinal);
if (beginAttachmentInfo != -1)
{
// attachmentInfo should be of the form <interactionId>/<attachmentIndex>, so split it into the parts
string attachmentInfo = context.RelativePath.Substring(beginAttachmentInfo + 6);
RenderFileAttachment(context, attachmentInfo);
}
else
{
// This means the requested file is not in the package, nor is it a request for an attachment.
throw new FileNotFoundException(AIResources.FileNotFound);
}
}
/// <summary> /// Requests the RloHandler to modify the <c>RloHandlerContext.InputStream</c> and render the requested /// view to the <c>RloHandlerContext.OuputStream</c> /// </summary> /// <param name="context">The context within which to render the content.</param> public abstract void Render(RloRenderContext context);
/// <summary>
/// Requests the RloHandler to render the requested
/// view to the <c>RloHandlerContext.OuputStream</c>
/// </summary>
/// <param name="context"></param>
public override void Render(RloRenderContext context)
{
// This rlo handler does nothing to process the content, so just send the file
// to the response.
context.WriteFileToResponse(context.RelativePath);
}
/// <summary>
/// Render a file attachment. File attachments will have a relativePath of the form:
/// .../~RLO/<interactionId>/<attachmentIndex>
/// </summary>
/// <param name="context"></param>
/// <param name="attachmentInfo">The portion of the path to the file after the "/~RLO" portion.</param>
/// <exception cref="FileNotFoundException">The requested file attachment can't be found.</exception>
private static void RenderFileAttachment(RloRenderContext context, string attachmentInfo)
{
AIResources.Culture = LocalizationManager.GetCurrentCulture();
// File attachments will have a relativePath of the form:
// .../~RLO/<interactionId>/<attachmentIndex>
//
// If it's a request to view a file attachment, then there will be extension data in the data model of the form:
// ms.learningcomponents.fileAttachment.<interactionId>.<attachmentIndex>
// find the /~RLO/ portion of the path, so that we can find the beginning of the <interactionId>/<attachmentIndex>
// part of the path.
// attachmentInfo should be of the form <interactionId>/<attachmentIndex>, so split it into the parts
string[] splitAttachmentInfo = attachmentInfo.Split(new char[] { '/' });
LearningDataModel learningDataModel = context.LearningDataModel;
//if(learningDataModel.Interactions.Contains(splitAttachmentInfo[0]))
if(learningDataModel.InteractionListContains(splitAttachmentInfo[0]))
{
//Interaction i = learningDataModel.Interactions[splitAttachmentInfo[0]];
Interaction i = learningDataModel.InteractionListElement(splitAttachmentInfo[0]);
string fileAttachmentKey = FileAttachmentKey(splitAttachmentInfo[1]);
if (i.ExtensionData.ContainsKey(fileAttachmentKey))
{
byte[] fileAttachment = (byte[])i.ExtensionData[fileAttachmentKey];
if (context.Response != null)
{
context.Response.Clear();
}
context.SetOutputStreamExtension((string)i.ExtensionData[FileAttachmentExtensionKey(splitAttachmentInfo[1])]);
context.WriteFileToResponse(fileAttachment);
return;
}
}
// couldn't get the file
throw new FileNotFoundException(AIResources.FileAttachmentNotFound);
}
/// <summary>
/// Render the requested view into the output stream.
/// </summary>
/// <param name="context">The context within which to render the page.</param>
/// <remarks>
/// When this method returns the <paramref name="context"/> OutputStream will contain
/// the rendered file.
/// <p>
/// The following methods and properties must be return valid values from
/// the <paramref name="context"/>:
/// <ul>
/// <li>EmbeddedUiResourcePath, must be non-null</li>
/// <li>FormElementId</li>
/// <li>GetInputStream</li>
/// <li>OutputStream</li>
/// <li>View</li>
/// </ul>
/// </p>
/// <p>
/// Additionally, if the following properties are set, they will be used:
/// <ul>
/// <li>FormElementAction</li>
/// <li>HiddenControls</li>
/// <li>ScriptToRender</li>
/// </ul>
/// </p>
/// All other properties on <paramref name="context"/> are ignored.
/// </remarks>
/// <exception cref="FileNotFoundException">The requested file attachment can't be found.</exception>
public override void Render(RloRenderContext context)
{
AIResources.Culture = LocalizationManager.GetCurrentCulture();
// string is the key (which is AssessmentItem.Id_AssessmentItem.Type)
// int is the ordinal (0 based) which is the number of times the key has been processed
Dictionary<string, int> assessmentItems = new Dictionary<string, int>();
// The most common case is that the file is in the package
Stream inputStream = null;
AssessmentItemManager.DataModelContext = context;
LearningDataModel learningDataModel = context.LearningDataModel;
try
{
int srcIndex; // represents the index of the "src" attribute on an <img> node.
// If this is the first time the page is being rendered, parse the page and determine
// the interactions on the page.
if (context.View == SessionView.Execute)
{
if (!GetPageHasBeenVisited(learningDataModel))
{
using (inputStream = context.GetInputStream())
{
// If the file being requested is the default file for the current activity,
if (context.IsResourceEntryPoint)
{
// find all the assessment items (<IMG> tags that contain the text "mslamrk" as part of the src attribute.)
using (HtmlTextReader reader = new HtmlTextReader(inputStream))
{
while (reader.Read())
{
if (IsAITag(reader, out srcIndex))
{
try
{
AssessmentItem ai = AssessmentItem.Parse(reader.GetAttributeValue(srcIndex));
AssessmentItemRenderer renderer = AssessmentItemManager.GetRenderer(ai);
renderer.TryAddToDataModel();
}
catch (FormatException)
{
// skip this one. This is mirrored below in the 2nd pass.
}
}
}
}
}
}
SetPageHasBeenVisited(learningDataModel);
}
}
// must get the input stream again since it may not be possible to seek back to the beginning
using (inputStream = context.GetInputStream())
{
if (context.Response != null)
{
// Clear the output response
context.Response.Clear();
}
// If the file being requested is the default file for the current activity,
if (context.IsResourceEntryPoint)
{
if (context.View == SessionView.Execute)
{
// Set ExitMode to suspend so that when a student exits the activity it is left in a suspended state.
// This way if the activity is reactivated, the student's previous answers are intact.
learningDataModel.NavigationRequest.ExitMode = ExitMode.Suspended;
}
DetachableStream detachable = new DetachableStream(context.OutputStream);
// Parse through the input stream again, this time rendering into the output as we go.
using (StreamWriter writer = new StreamWriter(detachable))
{
using (HtmlTextReader reader = new HtmlTextReader(inputStream))
{
while (reader.Read())
{
if (IsAITag(reader, out srcIndex))
{
try
{
AssessmentItem ai = AssessmentItem.Parse(reader.GetAttributeValue(srcIndex));
AssessmentItemRenderer renderer = AssessmentItemManager.GetRenderer(ai);
if (assessmentItems.ContainsKey(ai.RenderKey))
{
assessmentItems[ai.RenderKey] += 1;
}
else
{
assessmentItems.Add(ai.RenderKey, 0);
}
writer.Write(renderer.Render(assessmentItems[ai.RenderKey]).ToString());
}
catch (FormatException)
{
// skip this one. This is mirrored above in the 1st pass.
}
}
else
{
HandleNode(reader, writer);
}
}
}
// don't allow closing the StreamWriter to close the context.OutputStream.
writer.Flush();
detachable.Detach();
}
// set the response type
context.SetOutputStreamExtension(Path.GetExtension(context.RelativePath));
}
else
{
// for a non-entry-point file, copy the file directly to the output stream
context.WriteFileToResponse(context.RelativePath);
}
}
return;
}
catch (FileNotFoundException)
{
// This means the requested file is not in the package. That's not necessarily a problem, since it
// may be a request for an attachment.
}
// We got here because the file is not in the package. In that case, render it if it is a file attachment
int beginAttachmentInfo = context.RelativePath.IndexOf("/~RLO/", StringComparison.Ordinal);
if (beginAttachmentInfo != -1)
{
// attachmentInfo should be of the form <interactionId>/<attachmentIndex>, so split it into the parts
string attachmentInfo = context.RelativePath.Substring(beginAttachmentInfo + 6);
RenderFileAttachment(context, attachmentInfo);
}
else
{
// This means the requested file is not in the package, nor is it a request for an attachment.
throw new FileNotFoundException(AIResources.FileNotFound);
}
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="context"></param>
internal AssessmentItemRenderer(RloDataModelContext context)
{
AIResources.Culture = LocalizationManager.GetCurrentCulture();
m_context = context;
m_renderContext = context as RloRenderContext;
}
