public void ProcessRequest(HttpContext context)
{
var ltiRequest = new LtiRequest(LtiConstants.BasicLaunchLtiMessageType)
{
ConsumerKey = "12345",
ResourceLinkId = "launch",
Url = new Uri(context.Request.Url, "Tool.aspx")
//Url = "http://localhost/LTI/tool.php"
};
// Tool
ltiRequest.ToolConsumerInfoProductFamilyCode = "LtiLibrary";
ltiRequest.ToolConsumerInfoVersion = "1.2";
// Context
ltiRequest.ContextId = "Home";
ltiRequest.ContextTitle = "Home";
ltiRequest.ContextType = LisContextType.CourseSection;
// Instance
ltiRequest.ToolConsumerInstanceGuid = context.Request.Url.Authority;
ltiRequest.ToolConsumerInstanceName = "LtiLibrary Sample";
ltiRequest.ResourceLinkTitle = "Launch";
ltiRequest.ResourceLinkDescription = "Perform a basic LTI 1.2 launch";
// User
ltiRequest.LisPersonEmailPrimary = "*****@*****.**";
ltiRequest.LisPersonNameFamily = "Doe";
ltiRequest.LisPersonNameGiven = "Joan";
ltiRequest.UserId = "1";
ltiRequest.SetRoles(new[] { Role.Instructor });
// Outcomes service (WebApi controller)
var controllerUrl = UrlHelper.GenerateUrl("DefaultApi", null, "OutcomesApi",
new RouteValueDictionary {{ "httproute", string.Empty }}, RouteTable.Routes,
context.Request.RequestContext, false);
Uri controllerUri;
if (Uri.TryCreate(context.Request.Url, controllerUrl, out controllerUri))
{
ltiRequest.LisOutcomeServiceUrl = controllerUri.AbsoluteUri;
ltiRequest.LisResultSourcedId = "ltilibrary-jdoe-1";
}
// Tool Consumer Profile service (WebApi controller)
controllerUrl = UrlHelper.GenerateUrl("DefaultApi", null, "ToolConsumerProfileApi",
new RouteValueDictionary { { "httproute", string.Empty } }, RouteTable.Routes,
context.Request.RequestContext, false);
if (Uri.TryCreate(context.Request.Url, controllerUrl, out controllerUri))
{
ltiRequest.ToolConsumerProfileUrl = controllerUri.AbsoluteUri;
ltiRequest.AddCustomParameter("tc_profile_url", "$ToolConsumerProfile.url");
}
// Send the launch request to the client browser
context.Response.WriteLtiRequest(ltiRequest, "secret");
}
/// <summary>
/// Parse the <see cref="IOwinRequest"/> into an <see cref="ILtiRequest"/>.
/// </summary>
/// <param name="request">The <see cref="IOwinRequest"/> to parse.</param>
/// <returns>The <see cref="ILtiRequest"/>.</returns>
public static async Task<ILtiRequest> ParseLtiRequestAsync(this IOwinRequest request)
{
var ltiRequest = new LtiRequest(null)
{
Url = request.Uri,
HttpMethod = request.Method
};
// LTI launch and content item requests are sent as form posts
if (request.ContentType.Equals("application/x-www-form-urlencoded"))
{
var form = await request.ReadFormAsync();
foreach (var pair in form)
{
ltiRequest.Parameters.Add(pair.Key, string.Join(",", pair.Value));
}
return ltiRequest;
}
// LTI Outcome requests and responses are sent as Plain Old XML
if (request.ContentType.Equals("application/xml"))
{
using (var ms = new MemoryStream())
{
try
{
await request.Body.CopyToAsync(ms);
using (var reader = new StreamReader(ms))
{
ltiRequest.ImsxPoxEnvelope = await reader.ReadToEndAsync();
}
}
finally
{
if (request.Body.CanSeek)
{
request.Body.Position = 0;
}
}
}
var authorizationHeader = request.GetAuthorizationHeader();
ltiRequest.Parameters.Add(authorizationHeader.Parameters);
return ltiRequest;
}
return ltiRequest;
}
/// <summary>
/// Create an LtiRequestViewModel that contains a ContentItemPlacementResponse.
/// </summary>
/// <param name="url">The content_item_return_url from the content-item message.</param>
/// <param name="consumerKey">The OAuth consumer key to use to sign the request.</param>
/// <param name="consumerSecret">The OAuth consumer secret to use to sign the request.</param>
/// <param name="contentItems">The ContentItemPlacementResponse to send.</param>
/// <param name="data">The data received in the original content-item message.</param>
/// <param name="ltiErrorLog">Optional plain text error message to be logged by the Tool Consumer.</param>
/// <param name="ltiErrorMsg">Optional plain text error message to be displayed by the Tool Consumer.</param>
/// <param name="ltiLog">Optional plain text message to be logged by the Tool Consumer.</param>
/// <param name="ltiMsg">Optional plain text message to be displayed by the Tool Consumer.</param>
/// <returns>The LtiRequestViewModel which contains a signed version of the response.</returns>
public static LtiRequestViewModel CreateContentItemSelectionViewModel(
string url, string consumerKey, string consumerSecret,
ContentItemSelectionGraph contentItems, string data,
string ltiErrorLog, string ltiErrorMsg, string ltiLog, string ltiMsg)
{
var ltiRequest = new LtiRequest(LtiConstants.ContentItemSelectionLtiMessageType)
{
Url = new Uri(url),
ConsumerKey = consumerKey,
ContentItems = contentItems.ToJsonLdString(),
Data = data,
LtiErrorLog = ltiErrorLog,
LtiErrorMsg = ltiErrorMsg,
LtiLog = ltiLog,
LtiMsg = ltiMsg
};
return ltiRequest.GetViewModel(consumerSecret);
}
// The most basic function of the Tool Provider is to receive basic launch requests from
// the Tool Consumer.
#region LTI 1.0 Tool Provider
/// <summary>
/// Display the tool requested by the Tool Consumer.
/// </summary>
/// <remarks>
/// This is the basic function of a Tool Provider.
/// </remarks>
public ActionResult Tool()
{
try
{
// Parse and validate the request
Request.CheckForRequiredLtiParameters();
var ltiRequest = new LtiRequest(null);
ltiRequest.ParseRequest(Request);
if (!ltiRequest.ConsumerKey.Equals("12345"))
{
ViewBag.Message = "Invalid Consumer Key";
return View();
}
var oauthSignature = Request.GenerateOAuthSignature("secret");
if (!oauthSignature.Equals(ltiRequest.Signature))
{
ViewBag.Message = "Invalid Signature";
return View();
}
// The request is legit, so display the tool
ViewBag.Message = string.Empty;
var model = new ToolModel
{
ConsumerSecret = "secret",
LtiRequest = ltiRequest
};
return View(model);
}
catch (LtiException e)
{
ViewBag.Message = e.Message;
return View();
}
}
/// <summary>
/// Writes the LtiConsumerRequest to the HttpResponse so that the client browser
/// executes the LTI launch request.
/// </summary>
/// <param name="response">The HttpResponse to write the launch request to.</param>
/// <param name="request">The LtiConsumerRequest to write.</param>
/// <param name="consumerSecret">The OAuth secret to use when signing the request.</param>
public static void WriteLtiRequest(this HttpResponse response, LtiRequest request, string consumerSecret)
{
var model = request.GetViewModel(consumerSecret);
var form = new StringBuilder();
form.AppendLine("<html>");
form.AppendLine("<head><title></title></head>");
form.AppendLine("<body>");
form.AppendFormat("<form method='post' action='{0}' id='form'>", model.Action).AppendLine();
foreach (var key in model.Fields.AllKeys)
{
form.AppendFormat("<input type='hidden' name='{0}' value='{1}' />", key, model.Fields[key])
.AppendLine();
}
form.AppendFormat("<input type='hidden' name='oauth_signature' value='{0}' />", model.Signature).AppendLine();
form.AppendLine("</form>");
form.AppendLine("<script>");
form.AppendLine(" document.getElementById('form').submit();");
form.AppendLine("</script>");
form.AppendLine("</body>");
form.AppendLine("</html>");
response.ContentType = "text/html";
response.Write(form.ToString());
}
public ActionResult Index()
{
ViewResult resultingView = null;
try
{
LtiSession session = null;
using (var sessionManager = _unityContainer.Resolve<ISessionManager>())
{
ITool tool = null;
session = sessionManager.TryToExtractSessionFromRequest(Request);
// Try to get the LTI request from Request.
try
{
Request.CheckForRequiredLtiParameters();
var newLtiRequest = new LtiRequest(null);
newLtiRequest.ParseRequest(Request);
tool = _unityContainer.Resolve<ITool>(newLtiRequest.ConsumerKey);
if (!tool.IsAuthorized(Request, newLtiRequest.Signature))
{
throw new Exception("Unauthorized.");
}
// Update the LTI request in the session.
if (session.Valid)
{
sessionManager.UpdateLtiRequest(session, newLtiRequest);
}
else
{
session.LtiRequest = newLtiRequest;
}
}
catch
{
if (!session.Valid)
{
throw;
}
}
if (session.Valid)
{
sessionManager.RefreshSession(session);
}
else
{
session.UserHostAddress = Request.UserHostAddress;
session = sessionManager.CreateValidSession(session);
}
if (tool == null)
{
tool = _unityContainer.Resolve<ITool>(session.ConsumerKey);
}
tool.SetSessionManager(sessionManager).SetSession(session);
var data = tool.HandleRequest(Request);
resultingView = View(data.ViewIdentifier, data.Model);
}
}
catch (Exception e)
{
_log.Error("Failed to get tool: " + e.Message);
resultingView = View("~/Views/StdErrorView.cshtml", new StdError()
{
Message = e.Message
});
}
return resultingView;
}
public ActionResult LtiLaunch(Lti1TestLaunch model, int link)
{
var request = new LtiRequest(LtiConstants.BasicLaunchLtiMessageType);
request.ConsumerKey = model.ConsumerKey;
request.Url = new Uri(model.Url);
request.AddCustomParameters(CustomParameters);
request.LaunchPresentationLocale = Thread.CurrentThread.CurrentUICulture.Name;
request.LaunchPresentationDocumentTarget = DocumentTarget.frame;
request.LaunchPresentationWidth = 400;
request.LaunchPresentationHeight = 300;
request.LaunchPresentationCssUrl = GetLaunchPresentationCssUrl();
request.LaunchPresentationReturnUrl = Request.Url.AbsoluteUri;
request.LisOutcomeServiceUrl = GetLisOutcomeServiceUrl();
request.ToolConsumerInfoProductFamilyCode = "LtiLibrary";
request.ToolConsumerInfoVersion = "1";
request.ToolConsumerProfileUrl = GetToolConsumerProfileUrl();
request.ToolConsumerInstanceContactEmail = "*****@*****.**";
request.ToolConsumerInstanceDescription = Assembly.GetExecutingAssembly().GetName().ToString();
request.ToolConsumerInstanceGuid = Assembly.GetExecutingAssembly().GetName().Name;
request.ToolConsumerInstanceName = "andyfmiller.com";
switch (link)
{
case 1: // Instructor, Course 1, Resource 1
request.ContextId = Course1.CourseId.ToString(CultureInfo.InvariantCulture);
request.ContextLabel = request.ContextId;
request.ContextTitle = ConvertToPlainText(Course1.Title);
request.ContextType = LisContextType.CourseSection;
request.LisCourseOfferingSourcedId = request.ContextId;
request.LisCourseSectionSourcedId = request.ContextId;
request.ResourceLinkId = Course1.Links[0].LinkId;
request.ResourceLinkTitle = ConvertToPlainText(Course1.Links[0].Title);
request.ResourceLinkDescription = ConvertToPlainText(Course1.Links[0].Description);
request.LisPersonEmailPrimary = Instructor.Email;
request.LisPersonNameFamily = Instructor.FamilyName;
request.LisPersonNameGiven = Instructor.GivenName;
request.LisPersonSourcedId = Instructor.UserId;
request.UserId = Instructor.UserId;
request.UserName = Instructor.Username;
request.Roles = Role.Instructor.ToString();
break;
case 2: // Instructor, Course 1, Resource 2
request.ContextId = Course1.CourseId.ToString(CultureInfo.InvariantCulture);
request.ContextLabel = request.ContextId;
request.ContextTitle = ConvertToPlainText(Course1.Title);
request.ContextType = LisContextType.CourseSection;
request.ResourceLinkId = Course1.Links[1].LinkId;
request.ResourceLinkTitle = ConvertToPlainText(Course1.Links[1].Title);
request.ResourceLinkDescription = ConvertToPlainText(Course1.Links[1].Description);
request.LisPersonEmailPrimary = Instructor.Email;
request.LisPersonNameFamily = Instructor.FamilyName;
request.LisPersonNameGiven = Instructor.GivenName;
request.LisPersonSourcedId = Instructor.UserId;
request.UserId = Instructor.UserId;
request.UserName = Instructor.Username;
request.Roles = Role.Instructor.ToString();
break;
case 3: // Instructor, Course 2, Resource 1
request.ContextId = Course2.CourseId.ToString(CultureInfo.InvariantCulture);
request.ContextLabel = request.ContextId;
request.ContextTitle = ConvertToPlainText(Course2.Title);
request.ContextType = LisContextType.CourseSection;
request.ResourceLinkId = Course2.Links[0].LinkId;
request.ResourceLinkTitle = ConvertToPlainText(Course2.Links[0].Title);
request.ResourceLinkDescription = ConvertToPlainText(Course2.Links[0].Description);
request.LisPersonEmailPrimary = Instructor.Email;
request.LisPersonNameFamily = Instructor.FamilyName;
request.LisPersonNameGiven = Instructor.GivenName;
request.LisPersonSourcedId = Instructor.UserId;
request.UserId = Instructor.UserId;
request.UserName = Instructor.Username;
request.Roles = Role.Instructor.ToString();
break;
case 4: // Student, Course 1, Resource 1
request.ContextId = Course1.CourseId.ToString(CultureInfo.InvariantCulture);
request.ContextLabel = request.ContextId;
request.ContextTitle = ConvertToPlainText(Course1.Title);
request.ContextType = LisContextType.CourseSection;
request.ResourceLinkId = Course1.Links[0].LinkId;
request.ResourceLinkTitle = ConvertToPlainText(Course1.Links[0].Title);
request.ResourceLinkDescription = ConvertToPlainText(Course1.Links[0].Description);
request.LisPersonEmailPrimary = Student.Email;
request.LisPersonNameFamily = Student.FamilyName;
request.LisPersonNameGiven = Student.GivenName;
request.LisPersonSourcedId = Student.UserId;
request.LisResultSourcedId = Student.UserId;
request.UserId = Student.UserId;
request.UserName = Student.Username;
request.Roles = Role.Learner.ToString();
break;
case 5: // Student, Course 1, Resource 2
request.ContextId = Course1.CourseId.ToString(CultureInfo.InvariantCulture);
request.ContextLabel = request.ContextId;
request.ContextTitle = ConvertToPlainText(Course1.Title);
request.ContextType = LisContextType.CourseSection;
request.ResourceLinkId = Course1.Links[1].LinkId;
request.ResourceLinkTitle = ConvertToPlainText(Course1.Links[1].Title);
request.ResourceLinkDescription = ConvertToPlainText(Course1.Links[1].Description);
//request.LisPersonEmailPrimary = Student.Email;
request.LisPersonNameFamily = Student.FamilyName;
request.LisPersonNameGiven = Student.GivenName;
request.LisPersonSourcedId = Student.UserId;
request.LisResultSourcedId = Student.UserId;
request.UserId = Student.UserId;
request.UserName = Student.Username;
request.Roles = Role.Learner.ToString();
break;
case 6: // Student, Course 2, Resource 1
request.ContextId = Course2.CourseId.ToString(CultureInfo.InvariantCulture);
request.ContextLabel = request.ContextId;
request.ContextTitle = ConvertToPlainText(Course2.Title);
request.ContextType = LisContextType.CourseSection;
request.ResourceLinkId = Course2.Links[0].LinkId;
request.ResourceLinkTitle = ConvertToPlainText(Course2.Links[0].Title);
request.ResourceLinkDescription = ConvertToPlainText(Course2.Links[0].Description);
//request.LisPersonEmailPrimary = Student.Email;
//request.LisPersonNameFamily = Student.FamilyName;
//request.LisPersonNameGiven = Student.GivenName;
request.LisPersonSourcedId = Student.UserId;
request.LisResultSourcedId = Student.UserId;
request.UserId = Student.UserId;
request.UserName = Student.Username;
request.Roles = Role.Learner.ToString();
break;
case 7: // Mentor, Course 1, Resource 1
// Tests passed with this launch
// 5.9
request.ContextId = Course1.CourseId.ToString(CultureInfo.InvariantCulture);
request.ContextLabel = request.ContextId;
request.ContextTitle = ConvertToPlainText(Course1.Title);
request.ContextType = LisContextType.CourseSection;
request.ResourceLinkId = Course1.Links[0].LinkId;
request.ResourceLinkTitle = ConvertToPlainText(Course1.Links[0].Title);
request.ResourceLinkDescription = ConvertToPlainText(Course1.Links[0].Description);
request.LisPersonEmailPrimary = Mentor.Email;
request.LisPersonNameFamily = Mentor.FamilyName;
request.LisPersonNameGiven = Mentor.GivenName;
request.UserId = Mentor.UserId;
request.UserName = Mentor.Username;
request.Roles = Role.Mentor.ToString();
request.RoleScopeMentor = Mentor.MentoringUserId;
break;
case 8: // Instructor, No context (6.4)
// Tests passed with this launch
// 6.4
request.ResourceLinkId = GradebookTool.LinkId;
request.ResourceLinkTitle = ConvertToPlainText(GradebookTool.Title);
request.ResourceLinkDescription = ConvertToPlainText(GradebookTool.Description);
request.LisPersonEmailPrimary = Instructor.Email;
request.LisPersonNameFamily = Instructor.FamilyName;
request.LisPersonNameGiven = Instructor.GivenName;
request.LisPersonSourcedId = Instructor.UserId;
request.UserId = Instructor.UserId;
request.UserName = Instructor.Username;
request.Roles = Role.Instructor.ToString();
break;
}
return View(request.GetViewModel(model.ConsumerSecret));
}
/// <summary>
/// Send a basic LTI launch request to the Tool Provider.
/// </summary>
/// <remarks>
/// This is the basic function of a Tool Consumer.
/// </remarks>
public ActionResult Launch()
{
Uri launchUri;
var ltiRequest = new LtiRequest(LtiConstants.BasicLaunchLtiMessageType)
{
ConsumerKey = "12345",
ResourceLinkId = "launch",
Url = Uri.TryCreate(Request.Url, Url.Action("Tool", "Provider"), out launchUri) ? launchUri : null
};
// Tool
ltiRequest.ToolConsumerInfoProductFamilyCode = "LtiLibrary";
ltiRequest.ToolConsumerInfoVersion = "1.2";
// Context
ltiRequest.ContextId = "Home";
ltiRequest.ContextTitle = "Home";
ltiRequest.ContextType = LisContextType.CourseSection;
// Instance
ltiRequest.ToolConsumerInstanceGuid = Request.Url == null ? null : Request.Url.Authority;
ltiRequest.ToolConsumerInstanceName = "LtiLibrary Sample";
ltiRequest.ResourceLinkTitle = "Launch";
ltiRequest.ResourceLinkDescription = "Perform a basic LTI 1.2 launch";
// User
ltiRequest.LisPersonEmailPrimary = "*****@*****.**";
ltiRequest.LisPersonNameFamily = "Doe";
ltiRequest.LisPersonNameGiven = "Joan";
ltiRequest.UserId = "1";
ltiRequest.SetRoles(new[] { Role.Instructor });
// Basic Outcomes service (WebApi controller)
var controllerUrl = UrlHelper.GenerateUrl("DefaultApi", null, "Outcomes",
new RouteValueDictionary { { "httproute", string.Empty } }, RouteTable.Routes,
Request.RequestContext, false);
Uri controllerUri;
if (Uri.TryCreate(Request.Url, controllerUrl, out controllerUri))
{
ltiRequest.LisOutcomeServiceUrl = controllerUri.AbsoluteUri;
}
ltiRequest.LisResultSourcedId = "ltilibrary-jdoe-1";
// Outcomes V2 service (WebApi controller)
controllerUrl = UrlHelper.GenerateUrl("LineItemsApi", null, "LineItems",
new RouteValueDictionary
{
{ "httproute", string.Empty },
{ "contextId", ltiRequest.ContextId }
},
RouteTable.Routes,
Request.RequestContext, false);
if (Uri.TryCreate(Request.Url, controllerUrl, out controllerUri))
{
ltiRequest.LineItemsServiceUrl = controllerUri.AbsoluteUri;
}
controllerUrl = UrlHelper.GenerateUrl("LineItemsApi", null, "LineItems",
new RouteValueDictionary
{
{ "httproute", string.Empty },
{ "contextId", ltiRequest.ContextId },
{ "id", LineItemsController.LineItemId }
},
RouteTable.Routes,
Request.RequestContext, false);
if (Uri.TryCreate(Request.Url, controllerUrl, out controllerUri))
{
ltiRequest.LineItemServiceUrl = controllerUri.AbsoluteUri;
}
ltiRequest.AddCustomParameter("lineitem_url", "$LineItem.url");
ltiRequest.AddCustomParameter("lineitems_url", "$LineItems.url");
// Tool Consumer Profile service (WebApi controller)
controllerUrl = UrlHelper.GenerateUrl("ToolConsumerProfileApi", null, "ToolConsumerProfile",
new RouteValueDictionary { { "httproute", string.Empty } }, RouteTable.Routes,
Request.RequestContext, false);
if (Uri.TryCreate(Request.Url, controllerUrl, out controllerUri))
{
ltiRequest.ToolConsumerProfileUrl = controllerUri.AbsoluteUri;
}
ltiRequest.AddCustomParameter("tc_profile_url", "$ToolConsumerProfile.url");
return View(ltiRequest.GetViewModel("secret"));
}
public void UpdateLtiRequest(LtiSession session, LtiRequest ltiRequest)
{
session.LtiRequest = ltiRequest;
_dbContext.SaveChanges();
}
/// <summary>
/// Create a basic launch request for the assignment.
/// </summary>
/// <param name="request">The browser request.</param>
/// <param name="assignment">The assignment to launch.</param>
/// <param name="user">The user that is launching the assignment.</param>
/// <returns>An LtiRequestViewModel which can be displayed by the View in such
/// a way that the browser will invoke the LTI launch.</returns>
public static LtiRequestViewModel CreateBasicLaunchRequestViewModel(HttpRequestBase request, Assignment assignment, ApplicationUser user)
{
var ltiRequest = new LtiRequest(LtiConstants.BasicLaunchLtiMessageType)
{
ConsumerKey = assignment.ConsumerKey,
ResourceLinkId = assignment.AssignmentId.ToString(CultureInfo.InvariantCulture),
Url = new Uri(assignment.Url)
};
var course = assignment.Course;
// Tool
ltiRequest.ToolConsumerInfoProductFamilyCode = Assembly.GetExecutingAssembly().GetName().Name;
ltiRequest.ToolConsumerInfoVersion = Assembly.GetExecutingAssembly().GetName().Version.ToString();
// Context
ltiRequest.ContextId = course.CourseId.ToString(CultureInfo.InvariantCulture);
ltiRequest.ContextTitle = course.Name;
ltiRequest.ContextType = course.EnrolledUsers.Any(u => u.Id == user.Id)
? LisContextType.CourseSection
: LisContextType.CourseTemplate;
// Instance
ltiRequest.ToolConsumerInstanceGuid = "~/".ToAbsoluteUrl();
var title = Assembly.GetExecutingAssembly().GetCustomAttributes<AssemblyTitleAttribute>().FirstOrDefault();
ltiRequest.ToolConsumerInstanceName = title == null ? null : title.Title;
ltiRequest.ResourceLinkTitle = assignment.Name;
ltiRequest.ResourceLinkDescription = assignment.Description;
// User
if (user.SendEmail.GetValueOrDefault(true))
{
ltiRequest.LisPersonEmailPrimary = user.Email;
}
if (user.SendName.GetValueOrDefault(true))
{
ltiRequest.LisPersonNameFamily = user.LastName;
ltiRequest.LisPersonNameGiven = user.FirstName;
}
ltiRequest.UserId = user.Id;
ltiRequest.UserName = user.UserName;
ltiRequest.SetRoles(GetLtiRolesForUser(user));
// Outcomes service
if (course.EnrolledUsers.Any(u => u.Id == user.Id))
{
var outcomesUrl = UrlHelper.GenerateUrl("DefaultApi", null, "Outcomes",
new RouteValueDictionary { { "httproute", string.Empty } }, RouteTable.Routes,
request.RequestContext, false);
Uri outcomesUri;
if (Uri.TryCreate(request.Url, outcomesUrl, out outcomesUri))
{
ltiRequest.LisOutcomeServiceUrl = outcomesUri.AbsoluteUri;
}
ltiRequest.LisResultSourcedId =
JsonConvert.SerializeObject(new LisResultSourcedId
{
AssignmentId = assignment.AssignmentId,
UserId = user.Id
});
}
// Tool Consumer Profile service
var profileUrl = UrlHelper.GenerateUrl("DefaultApi", null, "ToolConsumerProfile",
new RouteValueDictionary { { "httproute", string.Empty } }, RouteTable.Routes,
request.RequestContext, false);
Uri profileUri;
if (Uri.TryCreate(request.Url, profileUrl, out profileUri))
{
ltiRequest.ToolConsumerProfileUrl = profileUri.AbsoluteUri;
}
// Add the custom parameters. This consumer supports 3 special substitutions.
var customParameters = assignment.CustomParameters;
if (!string.IsNullOrWhiteSpace(customParameters))
{
ltiRequest.AddCustomParameters(customParameters);
}
return ltiRequest.GetViewModel(assignment.ConsumerSecret);
}
public static LtiRequestViewModel CreateContentItemSelectionRequestViewModel(HttpRequestBase request, ContentItemTool contentItemTool, Course course, ApplicationUser user, string returnUrl)
{
var ltiRequest = new LtiRequest(LtiConstants.ContentItemSelectionRequestLtiMessageType)
{
ConsumerKey = contentItemTool.ConsumerKey,
Url = new Uri(contentItemTool.Url)
};
// Tool Consumer
ltiRequest.ToolConsumerInfoProductFamilyCode = Assembly.GetExecutingAssembly().GetName().Name;
ltiRequest.ToolConsumerInfoVersion = Assembly.GetExecutingAssembly().GetName().Version.ToString();
// Context
ltiRequest.ContextId = course.CourseId.ToString(CultureInfo.InvariantCulture);
ltiRequest.ContextTitle = course.Name;
ltiRequest.ContextType = course.EnrolledUsers.Any(u => u.Id == user.Id)
? LisContextType.CourseSection
: LisContextType.CourseTemplate;
ltiRequest.LisCourseSectionSourcedId = course.CourseId.ToString(CultureInfo.InvariantCulture);
// Instance
ltiRequest.ToolConsumerInstanceGuid = "~/".ToAbsoluteUrl();
var title = Assembly.GetExecutingAssembly().GetCustomAttributes<AssemblyTitleAttribute>().FirstOrDefault();
ltiRequest.ToolConsumerInstanceName = title == null ? null : title.Title;
// User
if (user.SendEmail.GetValueOrDefault(true))
{
ltiRequest.LisPersonEmailPrimary = user.Email;
}
if (user.SendName.GetValueOrDefault(true))
{
ltiRequest.LisPersonNameFamily = user.LastName;
ltiRequest.LisPersonNameGiven = user.FirstName;
}
ltiRequest.UserId = user.Id;
ltiRequest.UserName = user.UserName;
ltiRequest.SetRoles(GetLtiRolesForUser(user));
// Presentation
ltiRequest.LaunchPresentationDocumentTarget = DocumentTarget.iframe;
// Content Item Tool
ltiRequest.AcceptMediaTypes = LtiConstants.LtiLinkMediaType; // Only accept LTI Link
ltiRequest.AcceptMultiple = true;
ltiRequest.AcceptPresentationDocumentTargets = "iframe";
ltiRequest.AcceptUnsigned = false;
ltiRequest.ContentItemReturnUrl = returnUrl;
//ltiRequest.ContentItemServiceUrl = "about:blank";
ltiRequest.Data = JsonConvert.SerializeObject(new ContentItemData
{
ContentItemToolId = contentItemTool.ContentItemToolId,
CourseId = course.CourseId
});
// Add the custom parameters.
var customParameters = contentItemTool.CustomParameters;
// This tool consumer supports 3 non-spec custom parameters
if (!string.IsNullOrWhiteSpace(customParameters))
{
ltiRequest.AddCustomParameters(customParameters);
}
return ltiRequest.GetViewModel(contentItemTool.ConsumerSecret);
}
public ActionResult PlaceContentItem(LtiRequest model)
{
var ltiMessageType = model.LtiMessageType;
if (!string.IsNullOrEmpty(ltiMessageType) &&
!ltiMessageType.Equals(LtiConstants.ContentItemSelectionLtiMessageType))
{
return RedirectToAction("BadRequest", "Error", new { error = "Unknown LTI message" });
}
var ltiResponse = (IContentItemSelection)model;
var data = JsonConvert.DeserializeObject<ContentItemData>(ltiResponse.Data);
var contentItemTool = ConsumerContext.ContentItemTools.Find(data.ContentItemToolId);
if (contentItemTool == null)
{
return RedirectToAction("BadRequest", "Error", new { error = "Invalid content item tool id" });
}
var course = ConsumerContext.Courses.Find(data.CourseId);
if (course == null)
{
return RedirectToAction("BadRequest", "Error", new { error = "Invalid course id" });
}
var contentItems = JsonConvert.DeserializeObject<ContentItemSelectionGraph>(ltiResponse.ContentItems);
foreach (var contentItem in contentItems.Graph)
{
if (contentItem.Type == LtiConstants.LtiLinkType)
{
var custom = new StringBuilder();
foreach (var key in contentItem.Custom.Keys)
{
custom.AppendFormat("{0}={1}\n", key, contentItem.Custom[key]);
}
var assignment = new Assignment
{
ConsumerKey = contentItemTool.ConsumerKey,
Course = course,
ConsumerSecret = contentItemTool.ConsumerSecret,
CustomParameters = custom.ToString(),
Description = contentItem.Text,
Name = contentItem.Title,
Url = (contentItem.Id ?? new Uri(contentItemTool.Url)).AbsoluteUri
};
ConsumerContext.Assignments.Add(assignment);
}
}
ConsumerContext.SaveChanges();
return RedirectToAction("Details", "Course", new { id = data.CourseId });
}
public void DeserializeLtiRequest()
{
LtiRequest = new JavaScriptSerializer().Deserialize<LtiRequest>(LtiRequestSerialized);
}
