private async Task ReloadAsync()
{
await ApplicationData.Current.LocalFolder.CreateFolderAsync("TimetableAppData", CreationCollisionOption.OpenIfExists);
try
{
using (var stream = File.OpenText(DataFilePath))
{
var newTimetable = (Timetable)JsonConvert.DeserializeObject(stream.ReadToEnd().Replace("$ASSEMBLY_NAME", Assembly.GetExecutingAssembly().GetName().Name), typeof(Timetable),
new JsonSerializerSettings()
{
TypeNameHandling = TypeNameHandling.Auto
});
if (newTimetable != null)
{
Name = newTimetable.Name;
UpdateURL = newTimetable.UpdateURL;
Lessons = newTimetable.Lessons;
OnSucessfulUpdate?.Invoke(this, null);
}
else
{
await SaveAsync();
}
}
}
catch
{
await SaveAsync();
}
}
public async Task <string> UpdateAsync()
{
if (string.IsNullOrEmpty(UpdateURL))
{
return("Bad update URL");
}
try
{
string oldSha512;
string newSha512;
Timetable newTimetable = null;
using (var localFile = File.OpenRead(DataFilePath))
{
var hasher = SHA512.Create();
var hash = hasher.ComputeHash(localFile);
oldSha512 = string.Concat(hash.Select(x => x.ToString("X2")));
}
using (var client = new WebClient())
{
byte[] data = await client.DownloadDataTaskAsync(UpdateURL);
using (var stream = new MemoryStream(data))
using (var sr = new StreamReader(stream))
{
var response = (UpdateResponse)JsonConvert.DeserializeObject(sr.ReadToEnd(), typeof(UpdateResponse));
newSha512 = response.SHA512;
if (string.Compare(oldSha512, newSha512, true) != 0)
{
data = await client.DownloadDataTaskAsync(response.Location);
var hash = SHA512.Create().ComputeHash(data);
var hashString = string.Concat(hash.Select(x => x.ToString("X2")));
if (string.Compare(newSha512, hashString, true) != 0)
{
return("Bad hash");
}
using (var timetableStream = new MemoryStream(data))
using (var timetableReader = new StreamReader(timetableStream))
{
var timetableData = timetableReader.ReadToEnd().Replace("$ASSEMBLY_NAME", Assembly.GetExecutingAssembly().GetName().Name);
//throw new Exception(timetableData);
newTimetable =
(Timetable)JsonConvert.DeserializeObject(timetableData, typeof(Timetable),
new JsonSerializerSettings {
TypeNameHandling = TypeNameHandling.Auto
});
}
}
else
{
return(null);
}
}
}
if (newTimetable != null)
{
Name = newTimetable.Name;
UpdateURL = newTimetable.UpdateURL;
Lessons = newTimetable.Lessons;
}
try
{
OnSucessfulUpdate?.Invoke(this, null);
}
catch { }
_ = SaveAsync();
return(null);
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine(e.ToString());
Console.WriteLine(e.ToString());
//throw;
return(e.ToString());
}
}
