public static async Task <(List <IDisposable>, HubConnection)> EstablishSignalRConnectionAsync(string token, ListAggregationViewModel vm,
IConfiguration configuration, Func <Task <User> > RequestForNewData, ListItemService listItemService,
Action <string> SetInvitationString)
{
var signalRAddress = configuration.GetSection("AppSettings")["SignlRAddress"];
HubConnection hubConnection = new HubConnectionBuilder().WithUrl(signalRAddress, (opts) =>
{
opts.Headers.Add("Access_Token", token);
opts.HttpMessageHandlerFactory = (message) =>
{
if (message is HttpClientHandler clientHandler)
{
// bypass SSL certificate
clientHandler.ServerCertificateCustomValidationCallback +=
(sender, certificate, chain, sslPolicyErrors) => { return(true); }
}
;
return(message);
};
}).WithAutomaticReconnect().Build();
var dataAreChangeDispose = hubConnection.On("DataAreChanged_" + App.User.UserId,
async() =>
{
var data = await RequestForNewData();
MessagingCenter.Send <ListAggregationViewModel, User>(vm, "New Data", data);
return;
});
var listItemArechangeDispose = hubConnection.On("ListItemAreChanged_" + App.User.UserId,
async(string command, int?id1, int?listAggregationId, int?parentId) =>
{
if (command.EndsWith("ListItem"))
{
var item = await listItemService.GetItem <ListItem>((int)id1, (int)listAggregationId);
if (command == "Edit/Save_ListItem")
{
var lists = App.User.ListAggregators.Where(a => a.ListAggregatorId == listAggregationId).FirstOrDefault();
ListItem foundListItem = null;
foreach (var listItem in lists.Lists)
{
foundListItem = listItem.ListItems.Single(a => a.Id == id1);
if (foundListItem != null)
{
break;
}
}
foundListItem.ListItemName = item.ListItemName;
foundListItem.State = item.State;
}
else
if (command == "Add_ListItem")
{
var tempList = App.User.ListAggregators.Where(a => a.ListAggregatorId == listAggregationId).FirstOrDefault().
Lists.Where(a => a.ListId == parentId).FirstOrDefault().ListItems;
if (!tempList.Where(a => a.Id == item.Id).Any())
{
tempList.Add(item);
}
MessagingCenter.Send <ListAggregationViewModel, User>(vm, "New Data", App.User);
}
else
if (command == "Delete_ListItem")
{
var lists = App.User.ListAggregators.Where(a => a.ListAggregatorId == listAggregationId).FirstOrDefault();
ListItem foundListItem = null;
List founfList = null;
foreach (var listItem in lists.Lists)
{
founfList = listItem;
foundListItem = listItem.ListItems.FirstOrDefault(a => a.Id == id1);
if (foundListItem != null)
{
break;
}
}
founfList.ListItems.Remove(foundListItem);
MessagingCenter.Send <ListAggregationViewModel, User>(vm, "New Data", App.User);
}
}
});
var newInvitationDispose = hubConnection.On("NewInvitation_" + App.User.UserId, async() =>
{
SetInvitationString("NEW");
});
List <IDisposable> disposables = new List <IDisposable>(new[]
{ newInvitationDispose, listItemArechangeDispose, dataAreChangeDispose });
await hubConnection.StartAsync();
return(disposables, hubConnection);
}