// Tells the local API when new diagnosis keys have been obtained from the server
static async Task <(ExposureDetectionSummary, IEnumerable <ExposureInfo>)> PlatformDetectExposuresAsync(IEnumerable <string> keyFiles)
{
// Submit to the API
var c = await GetConfigurationAsync();
var m = await GetManagerAsync();
var detectionSummary = await m.DetectExposuresAsync(
c,
keyFiles.Select(k => new NSUrl(k, false)).ToArray());
var summary = new ExposureDetectionSummary(
(int)detectionSummary.DaysSinceLastExposure,
detectionSummary.MatchedKeyCount,
detectionSummary.MaximumRiskScore);
// Get the info
IEnumerable <ExposureInfo> info = Array.Empty <ExposureInfo>();
if (summary?.MatchedKeyCount > 0)
{
var exposures = await m.GetExposureInfoAsync(detectionSummary, Handler.UserExplanation);
info = exposures.Select(i => new ExposureInfo(
((DateTime)i.Date).ToLocalTime(),
TimeSpan.FromMinutes(i.Duration),
i.AttenuationValue,
i.TotalRiskScore,
i.TransmissionRiskLevel.FromNative()));
}
// Return everything
return(summary, info);
}
// Tells the local API when new diagnosis keys have been obtained from the server
static async Task <(ExposureDetectionSummary, Func <Task <IEnumerable <ExposureInfo> > >)> PlatformDetectExposuresAsync(IEnumerable <string> keyFiles, CancellationToken cancellationToken)
{
// Submit to the API
var c = await GetConfigurationAsync();
var m = await GetManagerAsync();
// Extract all the files from the zips
var allFiles = new List <string>();
foreach (var file in keyFiles)
{
using var stream = File.OpenRead(file);
using var archive = new ZipArchive(stream, ZipArchiveMode.Read);
// .bin
var binTmp = Path.Combine(FileSystem.CacheDirectory, Guid.NewGuid().ToString() + ".bin");
using (var binWrite = File.Create(binTmp))
{
var bin = archive.GetEntry("export.bin");
using var binRead = bin.Open();
await binRead.CopyToAsync(binWrite);
}
allFiles.Add(binTmp);
// .sig
var sigTmp = Path.ChangeExtension(binTmp, ".sig");
using (var sigWrite = File.Create(sigTmp))
{
var sig = archive.GetEntry("export.sig");
using var sigRead = sig.Open();
await sigRead.CopyToAsync(sigWrite);
}
allFiles.Add(sigTmp);
}
// Start the detection
var detectionSummaryTask = m.DetectExposuresAsync(
c,
allFiles.Select(k => new NSUrl(k, false)).ToArray(),
out var detectProgress);
cancellationToken.Register(detectProgress.Cancel);
var detectionSummary = await detectionSummaryTask;
// Delete all the extracted files
foreach (var file in allFiles)
{
try
{
File.Delete(file);
}
catch
{
// no-op
}
}
var attDurTs = new List <TimeSpan>();
var dictKey = new NSString("attenuationDurations");
if (detectionSummary.Metadata.ContainsKey(dictKey))
{
var attDur = detectionSummary.Metadata.ObjectForKey(dictKey) as NSArray;
for (nuint i = 0; i < attDur.Count; i++)
{
attDurTs.Add(TimeSpan.FromSeconds(attDur.GetItem <NSNumber>(i).Int32Value));
}
}
var sumRisk = 0;
dictKey = new NSString("riskScoreSumFullRange");
if (detectionSummary.Metadata.ContainsKey(dictKey))
{
var sro = detectionSummary.Metadata.ObjectForKey(dictKey);
if (sro is NSNumber sron)
{
sumRisk = sron.Int32Value;
}
}
var maxRisk = 0;
dictKey = new NSString("maximumRiskScoreFullRange");
if (detectionSummary.Metadata.ContainsKey(dictKey))
{
var sro = detectionSummary.Metadata.ObjectForKey(dictKey);
if (sro is NSNumber sron)
{
maxRisk = sron.Int32Value;
}
}
else
{
maxRisk = detectionSummary.MaximumRiskScore;
}
var summary = new ExposureDetectionSummary(
(int)detectionSummary.DaysSinceLastExposure,
detectionSummary.MatchedKeyCount,
maxRisk,
attDurTs.ToArray(),
sumRisk);
async Task <IEnumerable <ExposureInfo> > GetInfo()
{
// Get the info
IEnumerable <ExposureInfo> info = Array.Empty <ExposureInfo>();
if (summary?.MatchedKeyCount > 0)
{
var exposures = await m.GetExposureInfoAsync(detectionSummary, Handler.UserExplanation, out var exposuresProgress);
cancellationToken.Register(exposuresProgress.Cancel);
info = exposures.Select(i =>
{
var totalRisk = 0;
var dictKey = new NSString("totalRiskScoreFullRange");
if (i.Metadata.ContainsKey(dictKey))
{
var sro = i.Metadata.ObjectForKey(dictKey);
if (sro is NSNumber sron)
{
totalRisk = sron.Int32Value;
}
}
else
{
totalRisk = i.TotalRiskScore;
}
return(new ExposureInfo(
(DateTime)i.Date,
TimeSpan.FromMinutes(i.Duration),
i.AttenuationValue,
totalRisk,
i.TransmissionRiskLevel.FromNative()));
});
}
return(info);
}
// Return everything
return(summary, GetInfo);
}