// Call this when the app needs to update the local keys
public static async Task <bool> UpdateKeysFromServer(CancellationToken cancellationToken = default)
{
var processedAnyFiles = false;
await Handler?.FetchExposureKeyBatchFilesFromServerAsync(async downloadedFiles =>
{
cancellationToken.ThrowIfCancellationRequested();
if (!downloadedFiles.Any())
{
return;
}
if (nativeImplementation != null)
{
var r = await nativeImplementation.DetectExposuresAsync(downloadedFiles);
var hasMatches = (r.summary?.MatchedKeyCount ?? 0) > 0;
if (hasMatches)
{
await Handler.ExposureDetectedAsync(r.summary, r.getInfo);
}
}
else
{
#if __IOS__
// On iOS we need to check this ourselves and invoke the handler
var(summary, info) = await PlatformDetectExposuresAsync(downloadedFiles, cancellationToken);
// Check that the summary has any matches before notifying the callback
if (summary?.MatchedKeyCount > 0)
{
await Handler.ExposureDetectedAsync(summary, info);
}
#elif __ANDROID__
// on Android this will happen in the broadcast receiver
await PlatformDetectExposuresAsync(downloadedFiles, cancellationToken);
#endif
}
processedAnyFiles = true;
}, cancellationToken);
return(processedAnyFiles);
}
// Call this when the app needs to update the local keys
public static async Task <bool> UpdateKeysFromServer()
{
using var batches = new TemporaryExposureKeyBatches();
await Handler?.FetchExposureKeysFromServerAsync(batches);
if (!batches.Files.Any())
{
return(false);
}
if (nativeImplementation != null)
{
var r = await nativeImplementation.DetectExposuresAsync(batches);
var hasMatches = (r.summary?.MatchedKeyCount ?? 0) > 0;
if (hasMatches)
{
await Handler.ExposureDetectedAsync(r.summary, r.info);
}
return(true);
}
#if __IOS__
// On iOS we need to check this ourselves and invoke the handler
var(summary, info) = await PlatformDetectExposuresAsync(batches.Files);
// Check that the summary has any matches before notifying the callback
if (summary?.MatchedKeyCount > 0)
{
await Handler.ExposureDetectedAsync(summary, info);
}
#elif __ANDROID__
// on Android this will happen in the broadcast receiver
await PlatformDetectExposuresAsync(batches.Files);
#endif
return(true);
}