Update: Login on merge with same provider results in merge token removed and...

Update: Login on merge with same provider results in merge token removed and login to Coscine (coscine/issues#2592)

src/STS/Controllers/MergeController.cs

@@ -86,14 +86,14 @@ namespace Coscine.Api.STS.Controllers
                 }
             }
 
-            if (validMerge && contents != null && contents.Any((claim) => claim.Type == "UserGuid"))
+            if (validMerge && contents?.Any((claim) => claim.Type == "UserGuid") == true)
             {
-                var userGuidString = contents.Where((claim) => claim.Type == "UserGuid").First();
+                var userGuidString = contents.First((claim) => claim.Type == "UserGuid");
                 var correctGuid = Guid.TryParse(userGuidString.Value, out Guid userGuid);
                 if (correctGuid)
                 {
                     var userList = userModel.GetAllWhere((user) => user.Id == userGuid);
-                    if (userList.Count() > 0)
+                    if (userList.Any())
                     {
                         var mergeIntoUser = userList.First();
 
@@ -116,7 +116,18 @@ namespace Coscine.Api.STS.Controllers
                         }
                     }
                 }
+            }
+            else if (contents?.Any((claim) => claim.Type == "UserGuid") == true)
+            {
+                var userGuidString = contents.First((claim) => claim.Type == "UserGuid");
+                var coscineUser = new CoscineUser()
+                {
+                    UserName = userGuidString.Value,
+                    Email = ""
+                };
+                await _signInManager.SignInAsync(coscineUser, isPersistent: false);
 
+                return Redirect(UrlGenerator.ExtendReturnUrl(returnUrl, Request));
             }
 
             string loginUrl = UrlGenerator.GetLoginUrl(Request);