// this will be called when a potential exposure has been detected
public async Task ExposureDetectedAsync(ExposureDetectionSummary summary, Func <Task <IEnumerable <ExposureInfo> > > getExposureInfo)
{
userData.ExposureSummary = summary;
var exposureInfo = await getExposureInfo();
// Add these on main thread in case the UI is visible so it can update
await Device.InvokeOnMainThreadAsync(() =>
{
foreach (var i in exposureInfo)
{
userData.ExposureInformation.Add(i);
}
});
await userDataService.SetAsync(userData);
// If Enabled Local Notifications
if (userData.IsNotificationEnabled)
{
var notification = new NotificationRequest
{
NotificationId = 100,
Title = "Possible COVID-19 Exposure",
Description = "It is possible you have been exposed to someone who was a confirmed diagnosis of COVID-19. Tap for more details."
};
NotificationCenter.Current.Show(notification);
}
}
// this will be called when a potential exposure has been detected
public async Task ExposureDetectedAsync(ExposureDetectionSummary summary, Func <Task <IEnumerable <ExposureInfo> > > getExposureInfo)
{
UserExposureSummary userExposureSummary = new UserExposureSummary(summary.DaysSinceLastExposure, summary.MatchedKeyCount, summary.HighestRiskScore, summary.AttenuationDurations, summary.SummationRiskScore);
userData.ExposureSummary = userExposureSummary;
var exposureInfo = await getExposureInfo();
// Add these on main thread in case the UI is visible so it can update
await Device.InvokeOnMainThreadAsync(() =>
{
foreach (var exposure in exposureInfo)
{
Console.WriteLine($"COCOA found exposure {exposure.Timestamp}");
UserExposureInfo userExposureInfo = new UserExposureInfo(exposure.Timestamp, exposure.Duration, exposure.AttenuationValue, exposure.TotalRiskScore, (Covid19Radar.Model.UserRiskLevel)exposure.TransmissionRiskLevel);
userData.ExposureInformation.Add(userExposureInfo);
}
});
await userDataService.SetAsync(userData);
// If Enabled Local Notifications
//if (userData.IsNotificationEnabled)
//{
// var notification = new NotificationRequest
// {
// NotificationId = 100,
// Title = AppResources.LocalNotificationTitle,
// Description = AppResources.LocalNotificationDescription
// };
// NotificationCenter.Current.Show(notification);
//}
}
// this will be called when a potential exposure has been detected
public async Task ExposureDetectedAsync(ExposureDetectionSummary summary, Func <Task <IEnumerable <ExposureInfo> > > getExposureInfo)
{
userData.ExposureSummary = summary;
var exposureInfo = await getExposureInfo();
// Add these on main thread in case the UI is visible so it can update
await Device.InvokeOnMainThreadAsync(() =>
{
foreach (var i in exposureInfo)
{
userData.ExposureInformation.Add(i);
}
});
await userDataService.SetAsync(userData);
// If Enabled Local Notifications
if (userData.IsNotificationEnabled)
{
var notification = new NotificationRequest
{
NotificationId = 100,
Title = AppResources.LocalNotificationTitle,
Description = AppResources.LocalNotificationDescription
};
NotificationCenter.Current.Show(notification);
}
}
private async Task DisabledAsync()
{
userData.IsExposureNotificationEnabled = false;
await userDataService.SetAsync(userData);
await UpdateStatusMessage();
}
/*
* public async Task TestDownloadBatch()
* {
* long sinceEpochSeconds = new DateTimeOffset(DateTime.UtcNow.AddDays(-14)).ToUnixTimeSeconds();
* TemporaryExposureKeysResult tekResult = await httpDataService.GetTemporaryExposureKeys(sinceEpochSeconds);
* Console.WriteLine("Fetch Exposure Key");
*
* foreach (var keys in tekResult.Keys)
* {
* Console.WriteLine(keys.Url);
* }
*
* }
*
* public bool GetOptInStatus()
* {
* return userData.IsOptined;
* }
*/
/*
* public async Task SetOptinStatusAsync(bool flg)
* {
* userData.IsOptined = flg;
* await userDataService.SetAsync(userData);
* }
* public bool GetOptInStatus()
* {
* return userData.IsOptined;
* }
*
*
* public async Task SetExposureNotificationStatusAsync(bool flg)
* {
* userData.IsExposureNotificationEnabled = flg;
* await userDataService.SetAsync(userData);
* }
* public bool GetExposureNotificationStatus()
* {
* return userData.IsExposureNotificationEnabled;
* }
*
* public async Task SetNotificationStatusAsync(bool flg)
* {
* userData.IsNotificationEnabled = flg;
* await userDataService.SetAsync(userData);
* }
* public bool GetNotificationStatus()
* {
* return userData.IsNotificationEnabled;
* }
*/
public async Task <bool> StartExposureNotification()
{
if (!userData.IsOptined)
{
await UserDialogs.Instance.AlertAsync("利用規約に同意する必要があります。同意ページへ遷移します。");
await navigationService.NavigateAsync(nameof(PrivacyPolicyPage));
}
Status status = await ExposureNotification.GetStatusAsync();
if (status == Status.BluetoothOff
// || status == Status.Restricted
|| status == Status.NotAuthorized)
{
await UserDialogs.Instance.AlertAsync(GetStatusMessage(status));
userData.IsExposureNotificationEnabled = false;
await userDataService.SetAsync(userData);
return(false);
}
// bool IsEnabled = await ExposureNotification.IsEnabledAsync();
if (userData.IsOptined && userData.IsExposureNotificationEnabled && (status == Status.Unknown || status == Status.Active || status == Status.Disabled))
{
try
{
await ExposureNotification.StartAsync();
}
catch (Exception)
{
userData.IsExposureNotificationEnabled = false;
await userDataService.SetAsync(userData);
return(false);
}
}
return(true);
}
public async Task <bool> StartExposureNotification()
{
/*
* if (!userData.IsOptined)
* {
* await UserDialogs.Instance.AlertAsync("利用規約に同意する必要があります。同意ページへ遷移します。");
* await navigationService.NavigateAsync(nameof(PrivacyPolicyPage));
* }
*/
try
{
await ExposureNotification.StartAsync();
var count = 0;
while (true)
{
Thread.Sleep(1000);
await ExposureNotification.StartAsync();
Status status = await ExposureNotification.GetStatusAsync();
if (status == Status.Active)
{
return(true);
}
else if (status == Status.BluetoothOff)
{
await UserDialogs.Instance.AlertAsync(GetStatusMessage());
return(true);
}
else
{
if (count > 2)
{
throw new Exception();
}
count++;
}
}
}
catch (Exception)
{
userData.IsExposureNotificationEnabled = false;
await userDataService.SetAsync(userData);
return(false);
}
/*
* ExposureNotificationStatus = await ExposureNotification.GetStatusAsync();
* if (ExposureNotificationStatus == Status.BluetoothOff
* // || ExposureNotificationStatus == Status.Restricted
|| ExposureNotificationStatus == Status.NotAuthorized)
||{
|| await UserDialogs.Instance.AlertAsync(GetStatusMessage());
|| userData.IsExposureNotificationEnabled = false;
|| await userDataService.SetAsync(userData);
|| return false;
||}
||
||if (userData.IsOptined && userData.IsExposureNotificationEnabled && (ExposureNotificationStatus == Status.Unknown || ExposureNotificationStatus == Status.Active || ExposureNotificationStatus == Status.Disabled))
||{
|| try
|| {
|| await ExposureNotification.StartAsync();
||
|| }
|| catch (Exception)
|| {
|| userData.IsExposureNotificationEnabled = false;
|| await userDataService.SetAsync(userData);
|| return false;
|| }
||}
||return true;
*/
}
// this will be called when they keys need to be collected from the server
public async Task FetchExposureKeyBatchFilesFromServerAsync(Func <IEnumerable <string>, Task> submitBatches)
{
// This is "default" by default
var rightNow = DateTimeOffset.UtcNow;
try
{
foreach (var serverRegion in userData.ServerBatchNumbers.ToArray())
{
// Find next directory to start checking
var dirNumber = serverRegion.Value + 1;
// For all the directories
while (true)
{
// Download all the files for this directory
var(batchNumber, downloadedFiles) = await DownloadBatchAsync(serverRegion.Key, dirNumber);
if (batchNumber == 0)
{
break;
}
// Process the current directory, if there were any files
if (downloadedFiles.Count > 0)
{
await submitBatches(downloadedFiles);
// delete all temporary files
foreach (var file in downloadedFiles)
{
try
{
File.Delete(file);
}
catch
{
// no-op
}
}
}
// Update the preferences
userData.ServerBatchNumbers[serverRegion.Key] = dirNumber;
await userDataService.SetAsync(userData);
dirNumber++;
}
}
}
catch (Exception ex)
{
// any expections, bail out and wait for the next time
// TODO: log the error on some server!
Console.WriteLine(ex);
}
async Task <(int, List <string>)> DownloadBatchAsync(string region, ulong dirNumber)
{
var downloadedFiles = new List <string>();
var batchNumber = 0;
// For all the batches in a directory
while (true)
{
// TODO Implement httpdata service
// Build the blob storage url for the given batch file we are on next
var url = $"{apiUrlBlobStorageBase}/{blobStorageContainerNamePrefix}{region.ToLowerInvariant()}/{dirNumber}/{batchNumber + 1}.dat";
var response = await http.GetAsync(url);
// If we get a 404, there are no newer batch files available to download
if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
{
break;
}
response.EnsureSuccessStatusCode();
// Skip batch files which are older than 14 days
if (response.Content.Headers.LastModified.HasValue && response.Content.Headers.LastModified < rightNow.AddDays(-14))
{
// If the first one is too old, the fake download it and pretend there was only one
// We can do this because each batch was created at the same time
batchNumber++;
break;
}
var tmpFile = Path.Combine(FileSystem.CacheDirectory, Guid.NewGuid().ToString() + ".zip");
// Read the batch file stream into a temporary file
using var responseStream = await response.Content.ReadAsStreamAsync();
using var fileStream = File.Create(tmpFile);
await responseStream.CopyToAsync(fileStream);
downloadedFiles.Add(tmpFile);
batchNumber++;
}
return(batchNumber, downloadedFiles);
}
}
