Today I've been trying to program a little bit in the MVC 4 Facebook API developed by Microsoft (based on the example of: http://www.asp.net/mvc/tutorials/mvc-4/aspnet-mvc-facebook-birthday-app)
So far I managed to manipulate the MyAppUser model, etc. Everything working fine and as intended. I only have a slight problem when I'm switching through controllers.
Is there any way to retain the FacebookContext object through controllers?
Unfortunately the above example (from Microsoft) only loads MyAppUser in the Home controller as follows:
[FacebookAuthorize("email", "user_photos")]
public async Task<ActionResult> Index(FacebookContext context) {
if (ModelState.IsValid) {
var user = await context.Client.GetCurrentUserAsync<MyAppUser>();
return View(user);
}
return View("Error");
}
What should I do if I use another controller in the application? How can I obtain a FacebookContext reference to get the user?
Things I tried:
Putting FacebookContext context into the other Controller (is always null)
Putting the FacebookContext object into Session or ViewBag - no avail, and sounds way too dirty anyway.
Am I missing something crucial here?
I just wanted to have a different Controller with a couple of actions to manage a User's profile, which would be done completely separately from Facebook's data (via a database hosted locally.) The only reason I need to load the Context is to get the current user's e-mail address to create their account on that basis.
Any help would be greatly appreciated as I've spent quite a considerable amount of time trying to fix it.
My example controller could be:
public ActionResult Manage()
{
var user = await context.Client.GetCurrentUserAsync<Models.MyAppUser>();
if (MyDALFunction.GetUserByMail(user.Email) == null) {
// Create user functions, create a ViewModel, pass it on and do some editing.
}
return View(user);
}
This is how I solved this:
First, in Home Controller I save access token to TempData
public async Task<ActionResult> Index(FacebookContext context)
{
if (ModelState.IsValid)
{
this.TempData["accessToken"] = context.AccessToken;
Then I read it in another action in different controller. If access token is empty, it means that user is not logged in, so I redirect him to Home controller.
var accessToken = TempData["accessToken"] as string;
if (string.IsNullOrEmpty(accessToken))
{
//if access token is null or user is not logged in, redirect to home controller
return RedirectToAction("Index", "Home");
}
else
{
var fb = new Facebook.FacebookClient(accessToken);
var me = fb.Get("me") as Facebook.JsonObject; //current logged user
var userFacebookId = me["id"].ToString();
Instead of "id", you can read email.
EDIT:
Retrieving accessToken from TempData returned null, when i tried to do that in another controller. It would be better to store it in Session instead.
Where to store Facebook access token in ASP.NET MVC?
Sorry, for answering too late.. but if i understood your question correctly then i think you are trying to get the FacebookContext object in you Action Method when post-back occurs. If so, then.. In your .cshtml try to put
<a target="_top" href="#GlobalFacebookConfiguration.Configuration.AppUrl#Url.Action("Manage", new { friendId = friend.Id })" role="button" class="btn btn-success">
and then make you action method like...
public ActionResult Manage(string friendId, FacebookContext context)
{
var friend = await context.Client.GetFacebookObjectAsync<MyAppUserFriend>(friendId);
// var user = await context.Client.GetCurrentUserAsync<Models.MyAppUser>();
if (MyDALFunction.GetUserByMail(friend.Email) == null) {
// Create user functions, create a ViewModel, pass it on and do some editing.
}
return View(user);
}
But Make sure that your MyAppUserFriend model have the Email attribute..
If you wanted any thing else then please provide some detail of you Model and your View
Related
Implementing a MVC application in C# with Evernote API. I am using the AsyncOAuth.Evernote.Simple nuget package. Receiving and error of Refused to display in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN', when trying to navigate to URL that fires off the OAuth process.
There is an iframe that is surrounding my code (which can not be altered). After implementing the code an error is generated: "An item with the same key has already been added". This error occurs when requestToken is hit for the first time.
Below is my EvernoteProviderController.cs
public class EvernoteProviderController : Controller
{
// Initialize Oauth call, pulling values from web.config
EvernoteAuthorizer EvernoteAuthorizer = new EvernoteAuthorizer(ConfigurationManager.AppSettings["Evernote.Url"] + "&output=embed", ConfigurationManager.AppSettings["Evernote.Key"], ConfigurationManager.AppSettings["Evernote.Secret"]);
// This method makes the original call to Evernote to get a token so that the user can validate that they want to access this site.
public ActionResult Authorize(bool reauth = false)
{
// Allow for reauth
if (reauth)
SessionHelper.Clear();
// First of all, check to see if the user is already registered, in which case tell them that
if (SessionHelper.EvernoteCredentials != null)
return Redirect(Url.Action("AlreadyAuthorized"));
// Evernote will redirect the user to this URL once they have authorized your application
var callBackUrl = Request.Url.GetLeftPart(UriPartial.Authority) + Url.Action("ObtainTokenCredentials");
// Generate a request token - this needs to be persisted till the callback
var requestToken = EvernoteAuthorizer.GetRequestToken(callBackUrl);
// Persist the token
SessionHelper.RequestToken = requestToken;
// Redirect the user to Evernote so they can authorize the app
var callForwardUrl = EvernoteAuthorizer.BuildAuthorizeUrl(requestToken);
return Redirect(callForwardUrl);
}
// This action is the callback that Evernote will redirect to after the call to Authorize above
public ActionResult ObtainTokenCredentials(string oauth_verifier)
{
// Use the verifier to get all the user details we need and store them in EvernoteCredentials
var credentials = EvernoteAuthorizer.ParseAccessToken(oauth_verifier, SessionHelper.RequestToken);
if (credentials != null)
{
SessionHelper.EvernoteCredentials = credentials;
return Redirect(Url.Action("Authorized"));
}
else
{
return Redirect(Url.Action("Unauthorized"));
}
}
// Show the user if they are authorized
public ActionResult Authorized()
{
return View(SessionHelper.EvernoteCredentials);
}
public ActionResult Unauthorized()
{
return View();
}
//Redirects user if already authorized, then dump out the EvernoteCredentials object
public ActionResult AlreadyAuthorized()
{
return View(SessionHelper.EvernoteCredentials);
}
public ActionResult Settings()
{
return View();
}
}
Has anyone had this issue with iframes before or knows in what direction I should go? I am trying to embed my URL endpoint so I can get around the iframe error.
Solved the error.
A bit of back story:
The purpose of this application was to provide the OAuth page where a user can sign up which will generate a AuthToken and NotebookURL, (both are needed with Evernote API to pull read/write Notes - which is Evernote's object).
The previous behavior (before I changed it), was when a user clicked on the link - they will be redirected (in the same window) to the Evernote OAuth page.
This caused issues for me, because I had another wrapper around my code (iframe). So in non-technical terms, I had a iframe within an iframe within an iframe.
Workaround
Created a JavaScript code which would add an click event listener, which would then create a popup using window.open.
$("#btnStart").click(function () {
myWindow = window.open(baseUrl + "/EvernoteProvider/Authorize", '_blank', 'width=500,height=500, scrollbars=no,resizable=no');
myWindow.focus();
});
I'm working on ASP.NET MVC5 app based around Parse.com framework.
Since i can't use Parse login method i had to use method posted here to work around its limitations: Parse.com multiple users issue
Here is my login method(just minor changes):
public async Task<ActionResult> Login(AccountModel model) //no returnUrl string
{
ParseUser user;
try
{
user = await ParseUser.LogInAsync(model.UserName, model.Password);//login parse user
}
catch (Exception e)
{
ModelState.AddModelError("", "The user name or password provided is incorrect.");
return View(model);
}
//making setAuthCookie get parse object id instead of username
FormsAuthentication.SetAuthCookie(user.ObjectId, model.RememberMe);
ParseUser.LogOut(); //log out parse user
return RedirectToAction("index", "home"); //Redirect to Action
}
So basically i (parse)login user, set AuthCookie to it's object id and then (parse)logoff user. That way i can have multiple users logged in.Out of SetAuthCookie i can get users id now.
However i'd like to display some extra user data(like user adress, Type, Name, LastName) that is on parse.com cloud. So i figured i will just write a method that will get this data by using currently authenticated userID, fill my AccountModel class object with data and then pass it to views. This is a loose idea of how it'd look like(i know syntax is probably wrong, i don't have access to my Visual studio right now):
UserData model:
public async Task<AccountModel> GetUserData()
{
AccountModel userData = new AccountModel();
ParseObject user;
ParseQuery<ParseObject> query = ParseObject.GetQuery("_User");
try
{
//i can't remember how to get authenticated user identity
user = await query.GetAsync(AuthenticatedUser.Identity());
}
catch(Exception e)
{
//code to handle exception
}
userData.Name = user.Get<string>("Name");
userData.Lastname = user.Get<string>("Lastname");
userData.Adress = user.Get<string>("Adress");
return userData; //it will probably throw an error
}
Controller:
public ActionResult Index()
{
UserData model = new UserData();
return View(model.GetUserData());
}
So now it will probably throw an error(can't return T from Task< T >) and i have no idea how to fix this, so i can get currently logged in user data.
I have nav bar on my site where user name and last name is displayed, so i have to somehow get currently logged in user data every time page is displayed. Is there any work around/easier way to achieve this?
You fix this by making your Action asynchronous as well:
public async Task<ActionResult> Index()
{
UserData model = new UserData();
return View(await model.GetUserData());
}
Async goes "all the way". This means that once you have an asynchronous method that needs to be awaited, it will usually cause most (if not all) of your stack-trace to be asynchronous as well.
Side note:
Once should stick to .NET conventions and mark async methods with the XXXAsync postfix, so your method should actually be named GetUserDataAsync.
I'm using asp.net mvc,
I have a POST Method that called from an outside service(differnet domain) and i want when it called to get data from my site.
Before the method was called I tried to save that data in Session object and in a Cookie,
But the data is not there.
Maybe it could be because the post request sent from a different domain?
What am I doing wrong?
[HttpPost]
public ActionResult Callback(Callback callback)
{
Not Working ->
var userMail = HttpContext.Request.Cookies.Get("Current")["UserMail"];
}
public ActionResult SomeSitePage()
{
var cookie = new HttpCookie("Current");
var userMail = (Session["user"] as ApplicationUser).Email;
cookie["UserMail"] = userMail;
HttpContext.Response.Cookies.Add(cookie);
}
Thanks.
Apparently If a post method is called from another domain,
saving data in session or cookies does not count,
I needed to save it in the database first and then pull it out in the post method.
The goal
Get the user information after successful authentication.
The problem
Take a look in the following fragment of code:
[AcceptVerbs(HttpVerbs.Post)]
[ValidateAntiForgeryToken]
[AllowAnonymous]
public ActionResult Authenticate(User userModel)
{
if (ModelState.IsValid)
{
if (userModel.IsValid(userModel.Email, userModel.Password))
{
FormsAuthentication
.SetAuthCookie(userModel.Email, userModel.Remember);
return RedirectToAction("Index", "Manager");
}
else
{
ModelState.AddModelError("", "Login data is incorrect!");
}
}
return RedirectToAction("Index");
}
As you can see, it is a normal authentication's controller. What I need is simple: if the statement userModel.IsValid is true, how can I get the user information based on the email that he sent to the server by userModel.Email?
Maybe store the email on the session and in the Index method call some method to get the (user) information passing through parameter the email that inhabiting the session? (I think this isn't the best way because if the cookie exist and the session not, there will be a problem here.)
Code spotlight
To get information of some user, I'm using a simple method: User.Invoke((string) userEmail).
Knowledge improvement
I'm logging in on my website with email and password as various applications of the world do. With the email that the user enters, I'm attempting to get his information from database. So I ask: is this the best way to do this? Maybe isn't better firstly get the ID of the user by his email and then select his information?
What I already tried
In the Authenticate method (the same that I passed before), I implemented the following code:
[...]
public ActionResult Authenticate(User userModel)
[...]
if (userModel.IsValid(userModel, userModel.Password))
{
FormsAuthentication
.SetAuthCookie(userModel.Email, userModel.Remember);
Session["UserEmail"] = userModel.Email; // <-- Pay attention to this
return RedirectToAction("Index", "Manager");
}
[...]
}
And then, in the Index method:
public ActionResult Index()
{
if(Request.IsAuthenticated())
{
UserProfile user = User.Invoke(Session["UserEmail"]));
return View(user);
}
else
{
return View();
}
}
But as I said, if the cookie that flags that the user is logged in is alive and the session not, there will be a problem right here — a kind of concept conflict (cookie vs. session).
What can I do?
The accepted answer (from the discussion with the OP) is : the most straightforward way of retrieving the user name set by the forms authentication module is to use
HttpContext.Current.User.Identity.Name
or just
this.User.Identity.Name
in a controller.
I'm trying my hand at creating a session which stores member information which the application can use to reveal certain navigation and allow access to certain pages and member role specific functionality.
I've been able to assign my MemberLoggedIn object to the session in this way:
//code excerpt start...
MemberLoggedIn loggedIn = new MemberLoggedIn();
if (computedHash == member.Hash)
{
loggedIn.ID = member.ID;
loggedIn.Username = member.Username;
loggedIn.Email = member.Email;
loggedIn.Superuser = member.Superuser;
loggedIn.Active = member.Active;
Session["loggedIn"] = loggedIn;
}
else if (ModelState.IsValid) {
ModelState.AddModelError("Password", "Incorrect Username or Password.");
}
return View();
That works great. I then can send the properties of Session["loggedIn"] to the View in this way:
[ChildActionOnly]
public ActionResult Login()
{
if (Session["loggedIn"] != null)
ViewData.Model = Session["loggedIn"];
else
ViewData.Model = null;
return PartialView();
}
In the Partial View I can reference the session data by using Model.Username or Model.Superuser.
However, it doesn't seem to work that way in the controller or in a custom Action Filter. Is there a way to get the equivalent of Session["loggedIn"].Username?
Remember that ASP.Net MVC uses wrappers around the static ASP.Net singletons like Application and Session. This is to allow code to be decoupled from, and unit tested outside of the ASP.Net pipeline.
From an action filter, use:
((MembershipUser)filterContext.HttpContext.Session["loggedIn"]).Username
And from inside a controller, use:
((MembershipUser)ControllerContext.HttpContext.Session["loggedIn"]).Username
Like this:
MemberLoggedIn user = (MemberLoggedIn)HttpContext.Session["loggedIn"];