public bool Validate(ReleaseTeksArgs args, KeyReleaseWorkflowState workflow)
{
if (args == null)
{
return(false);
}
if (workflow.ValidUntil.AddMinutes(_Config.GracePeriodMinutes) <= _DateTimeProvider.Now()) //30 minutes grace period
{
_Logger.LogWarning($"Workflow is not valid anymore: {args.BucketId}");
return(false);
}
if (_Config.TemporaryExposureKeyCountMin > args.Keys.Length || args.Keys.Length > _Config.TemporaryExposureKeyCountMax)
{
_Logger.LogWarning($"Invalid number of keys: {args.BucketId}");
return(false);
}
if (!args.Keys.All(_TemporaryExposureKeyValidator.Valid))
{
_Logger.LogWarning($"One or more keys not valid: {args.BucketId}");
return(false);
}
return(true);
}
public async Task <EnrollmentResponse> Execute()
{
var validDate = _DateTimeProvider.Now().AddDays(1); //TODO smells like a setting
var entity = new KeyReleaseWorkflowState
{
LabConfirmationId = _NumberGenerator.GenerateToken(),
Created = _DateTimeProvider.Now(),
BucketId = Convert.ToBase64String(_NumberGenerator.GenerateKey()),
ConfirmationKey = Convert.ToBase64String(_NumberGenerator.GenerateKey()),
ValidUntil = new DateTime(validDate.Year, validDate.Month, validDate.Day, 4, 0, 0, DateTimeKind.Local) //TODO smells like a setting
};
_Logger.LogDebug("Writing.");
await _DbContextProvider.KeyReleaseWorkflowStates.AddAsync(entity);
_Logger.LogDebug("Committing.");
_DbContextProvider.SaveAndCommit();
_Logger.LogDebug("Committed.");
return(new EnrollmentResponse
{
ConfirmationKey = entity.ConfirmationKey,
BucketId = entity.BucketId,
LabConfirmationId = $"{entity.LabConfirmationId.Substring(0, 3)}-{entity.LabConfirmationId.Substring(3, 3)}", //TODO UI concern in DB!
Validity = (long)(entity.ValidUntil - _DateTimeProvider.Now()).TotalSeconds
});
}
public async Task AddExampleContent()
{
var r = new Random();
await using var tx = await _Provider.Database.BeginTransactionAsync();
var wfs1 = new KeyReleaseWorkflowState
{
LabConfirmationId = "2L2587",
BucketId = "2",
ConfirmationKey = "3",
Created = new DateTime(2020, 5, 1),
};
var key1 = new TemporaryExposureKeyEntity
{
Owner = wfs1,
PublishingState = PublishingState.Unpublished,
RollingPeriod = 1,
RollingStartNumber = 1,
TransmissionRiskLevel = 0,
KeyData = new byte[16],
Region = "NL"
};
r.NextBytes(key1.KeyData);
var key2 = new TemporaryExposureKeyEntity
{
Owner = wfs1,
PublishingState = PublishingState.Unpublished,
RollingPeriod = 1,
RollingStartNumber = 1,
TransmissionRiskLevel = 0,
KeyData = new byte[16],
Region = "NL"
};
r.NextBytes(key1.KeyData);
await _Provider.KeyReleaseWorkflowStates.AddAsync(wfs1);
await _Provider.TemporaryExposureKeys.AddRangeAsync(key1, key2);
_Provider.SaveAndCommit();
}
public bool Valid(byte[] signature, KeyReleaseWorkflowState workflow, byte[] data)
{
if (signature == null)
{
return(false);
}
using var hmac = new HMACSHA256(Convert.FromBase64String(workflow.ConfirmationKey));
var hash = hmac.ComputeHash(data);
var result = hash.SequenceEqual(signature);
if (!result)
{
_Logger.LogInformation($"Invalid signature for BucketId: {workflow.BucketId}");
}
return(result);
}
public bool Valid(byte[] signature, KeyReleaseWorkflowState workflow, byte[] data)
{
if (signature == null)
{
throw new ArgumentNullException(nameof(signature));
}
if (workflow == null)
{
throw new ArgumentNullException(nameof(workflow));
}
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
using var hmac = new HMACSHA256(Convert.FromBase64String(workflow.ConfirmationKey));
var hash = hmac.ComputeHash(data);
return(hash.SequenceEqual(signature));
}
public async Task <EnrollmentResponse> Execute()
{
var entity = new KeyReleaseWorkflowState
{
LabConfirmationId = _NumberGenerator.GenerateToken(),
Created = _DateTimeProvider.Now(),
BucketId = Convert.ToBase64String(_NumberGenerator.GenerateKey()),
ConfirmationKey = Convert.ToBase64String(_NumberGenerator.GenerateKey()),
};
await _DbContextProvider.KeyReleaseWorkflowStates.AddAsync(entity);
_DbContextProvider.SaveAndCommit();
var validDate = DateTime.Now.AddDays(1);
return(new EnrollmentResponse
{
ConfirmationKey = entity.ConfirmationKey,
BucketId = entity.BucketId,
LabConfirmationId = entity.LabConfirmationId,
ValidUntil = new DateTime(validDate.Year, validDate.Month, validDate.Day, 4, 0, 0, DateTimeKind.Local)
});
}
public bool Valid(byte[] signature, KeyReleaseWorkflowState workflow, byte[] data) => signature != null && workflow != null && data != null;
public bool Valid(byte[] signature, KeyReleaseWorkflowState workflow, byte[] data) => true;
