Initial commit

server/internal/httpapi/personal.go

@@ -0,0 +1,83 @@
+package httpapi
+
+import (
+	"errors"
+	"fmt"
+
+	"calllinesystem/server/internal/model"
+)
+
+var errTicketPhoneUnavailable = errors.New("ticket phone data is unavailable")
+
+func cloneStringPointer(value *string) *string {
+	if value == nil {
+		return nil
+	}
+	copy := *value
+	return &copy
+}
+
+func stringPointer(value string) *string {
+	return &value
+}
+
+func (s *Server) decryptTicketPersonal(ticket model.QueueTicket) (string, string, error) {
+	phone, err := s.decryptTicketPhone(ticket)
+	if err != nil {
+		return "", "", err
+	}
+	lastName, err := s.decryptTicketLastName(ticket)
+	if err != nil {
+		return "", "", err
+	}
+	return phone, lastName, nil
+}
+
+func (s *Server) decryptTicketPhone(ticket model.QueueTicket) (string, error) {
+	if ticket.PhoneHMAC == nil || len(ticket.PhoneCiphertext) == 0 || len(ticket.PhoneNonce) == 0 {
+		return "", errTicketPhoneUnavailable
+	}
+	phone, err := s.cipher.Decrypt(ticket.PhoneCiphertext, ticket.PhoneNonce, []byte("phone:"+ticket.ProjectID))
+	if err != nil {
+		return "", fmt.Errorf("decrypt ticket phone: %w", err)
+	}
+	return phone, nil
+}
+
+func (s *Server) decryptTicketLastName(ticket model.QueueTicket) (string, error) {
+	if len(ticket.LastNameCiphertext) == 0 && len(ticket.LastNameNonce) == 0 {
+		return "", nil
+	}
+	if len(ticket.LastNameCiphertext) == 0 || len(ticket.LastNameNonce) == 0 {
+		return "", errors.New("ticket last name data is incomplete")
+	}
+	lastName, err := s.cipher.Decrypt(ticket.LastNameCiphertext, ticket.LastNameNonce, []byte("last_name:"+ticket.ProjectID))
+	if err != nil {
+		return "", fmt.Errorf("decrypt ticket last name: %w", err)
+	}
+	return lastName, nil
+}
+
+func (s *Server) ticketPhoneLast4(ticket model.QueueTicket) (string, error) {
+	phone, err := s.decryptTicketPhone(ticket)
+	if err != nil {
+		if errors.Is(err, errTicketPhoneUnavailable) {
+			return "", nil
+		}
+		return "", err
+	}
+	return phoneLast4(phone)
+}
+
+func phoneLast4(phone string) (string, error) {
+	digits := make([]byte, 0, len(phone))
+	for i := 0; i < len(phone); i++ {
+		if phone[i] >= '0' && phone[i] <= '9' {
+			digits = append(digits, phone[i])
+		}
+	}
+	if len(digits) < 4 {
+		return "", errors.New("ticket phone has fewer than four digits")
+	}
+	return string(digits[len(digits)-4:]), nil
+}