Include credential index in CredentialInfo

credential.go

@@ -19,6 +19,7 @@ type credential struct {
 // CredentialInfo contains all information of an IRMA credential.
 type CredentialInfo struct {
 	ID            string             // e.g., "irma-demo.RU.studentCard"
+	Index         int                // This is the Index-th credential instance of this type
 	SignedOn      Timestamp          // Unix timestamp
 	Expires       Timestamp          // Unix timestamp
 	Type          *CredentialType    // Credential information from ConfigurationStore

manager.go

@@ -35,7 +35,9 @@ func (cm *CredentialManager) CredentialInfoList() CredentialInfoList {
 	list := CredentialInfoList([]*CredentialInfo{})
 
 	for _, attrlistlist := range cm.attributes {
-		for _, attrlist := range attrlistlist {
+		for index, attrlist := range attrlistlist {
+			info := attrlist.Info()
+			info.Index = index
 			list = append(list, attrlist.Info())
 		}
 	}