// Create an invitation to establish a connection between the agents.
public async Task <JObject> CreateConnectionAsync(Enrollee enrollee)
{
var alias = enrollee.Id.ToString();
var issuerDid = await _verifiableCredentialClient.GetIssuerDidAsync();
var schemaId = await _verifiableCredentialClient.GetSchemaId(issuerDid);
var invitation = await _verifiableCredentialClient.CreateInvitationAsync(alias);
var invitationUrl = invitation.Value <string>("invitation_url");
var credentialDefinitionId = await _verifiableCredentialClient.GetCredentialDefinitionIdAsync(schemaId);
QRCodeGenerator qrGenerator = new QRCodeGenerator();
QRCodeData qrCodeData = qrGenerator.CreateQrCode(invitationUrl, QRCodeGenerator.ECCLevel.Q);
Base64QRCode qrCode = new Base64QRCode(qrCodeData);
string qrCodeImageAsBase64 = qrCode.GetGraphic(20, "#003366", "#ffffff");
enrollee.Credential = new Credential
{
SchemaId = schemaId,
CredentialDefinitionId = credentialDefinitionId,
Alias = alias,
Base64QRCode = qrCodeImageAsBase64
};
var created = await _context.SaveChangesAsync();
if (created < 1)
{
throw new InvalidOperationException("Could not store connection invitation.");
}
// TODO after testing don't need to pass back the invitation
return(invitation);
}
// Create the credential offer.
private async Task <JObject> CreateCredentialOfferAsync(string connectionId, JArray attributes)
{
var issuerDid = await _verifiableCredentialClient.GetIssuerDidAsync();
var schema = (await _verifiableCredentialClient.GetSchema(SCHEMA_ID)).Value <JObject>("schema");
var credentialDefinitionId = await _verifiableCredentialClient.GetCredentialDefinitionIdAsync(SCHEMA_ID);
JObject credentialOffer = new JObject
{
{ "connection_id", connectionId },
{ "issuer_did", issuerDid },
{ "schema_id", SCHEMA_ID },
{ "schema_issuer_did", issuerDid },
{ "schema_name", schema.Value <string>("name") },
{ "schema_version", schema.Value <string>("version") },
{ "cred_def_id", credentialDefinitionId },
{ "comment", "PharmaNet GPID" },
{ "auto_remove", true },
{ "revoc_reg_id", null },
{ "credential_proposal", new JObject
{
{ "@type", "did:sov:BzCbsNYhMrjHiqZDTUASHg;spec/issue-credential/1.0/credential-preview" },
{ "attributes", attributes }
} }
};
_logger.LogInformation("Credential offer for connection ID \"{connectionId}\" for {@JObject}", connectionId, JsonConvert.SerializeObject(credentialOffer));
return(credentialOffer);
}
private async Task <Action> OnApplicationStartedAsync(IVerifiableCredentialClient _verifiableCredentialClient)
{
var issuerDid = await _verifiableCredentialClient.GetIssuerDidAsync();
var schemaId = await _verifiableCredentialClient.GetSchemaId(issuerDid);
if (schemaId == null)
{
schemaId = await _verifiableCredentialClient.CreateSchemaAsync();
}
var credentialDefinitionId = await _verifiableCredentialClient.GetCredentialDefinitionIdAsync(schemaId);
if (credentialDefinitionId == null)
{
credentialDefinitionId = await _verifiableCredentialClient.CreateCredentialDefinitionAsync(schemaId);
}
return(null);
}
public async Task <string> IssueCredentialsAsync(Patient patient, List <Identifier> identifiers)
{
var connectionActive = true;
var connection = await _context.Connections
.Where(c => c.AcceptedConnectionDate != null)
.OrderByDescending(c => c.AcceptedConnectionDate)
.FirstOrDefaultAsync(c => c.PatientId == patient.Id);
if (connection == null)
{
// Create connection and wait for connection to be accepted before issuing credentials
connection = await CreateConnectionAsync(patient);
connectionActive = false;
}
var alias = patient.Id.ToString();
var issuerDid = await _verifiableCredentialClient.GetIssuerDidAsync();
var schemaId = await _verifiableCredentialClient.GetSchemaId(issuerDid);
if (schemaId == null)
{
schemaId = await _verifiableCredentialClient.CreateSchemaAsync();
}
var credentialDefinitionId = await _verifiableCredentialClient.GetCredentialDefinitionIdAsync(schemaId);
if (credentialDefinitionId == null)
{
credentialDefinitionId = await _verifiableCredentialClient.CreateCredentialDefinitionAsync(schemaId);
}
var credentials = new List <Credential>();
foreach (var identifier in identifiers)
{
var newCredential = new Credential
{
ConnectionId = connection.Id,
SchemaId = schemaId,
CredentialDefinitionId = credentialDefinitionId,
Identifier = new Identifier
{
Guid = identifier.Guid,
Uri = identifier.Uri
}
};
credentials.Add(newCredential);
}
await _context.Credentials.AddRangeAsync(credentials);
var created = await _context.SaveChangesAsync();
if (created < 1)
{
throw new InvalidOperationException("Could not store credentials.");
}
if (connectionActive)
{
// Issue credentials if connection already active
foreach (var credential in credentials)
{
_logger.LogInformation("Issuing a credential with this connection_id: {connectionId}", connection.ConnectionId);
// Assumed that when a connection invitation has been sent and accepted
await IssueCredential(credential, connection.ConnectionId, credential.Identifier.Guid);
_logger.LogInformation("Credential has been issued for connection_id: {connectionId}", connection.ConnectionId);
}
return(null);
}
return(connection.Base64QRCode);
}