public void sendMail()

in sources/src/main/java/com/google/solutions/jitaccess/apis/clients/SmtpClient.java [60:128]
56 lines of code
6 McCabe index (conditional complexity)

  public void sendMail(
    @NotNull Collection<EmailAddress> toRecipients,
    @NotNull Collection<EmailAddress> ccRecipients,
    @NotNull String subject,
    @NotNull Multipart content,
    @NotNull EnumSet<Flags> flags
  ) throws MailException {
    Preconditions.checkNotNull(toRecipients, "toRecipients");
    Preconditions.checkNotNull(ccRecipients, "ccRecipients");
    Preconditions.checkNotNull(subject, "subject");
    Preconditions.checkNotNull(content, "content");

    PasswordAuthentication authentication;
    try {
      authentication = this.options.createPasswordAuthentication(this.secretManagerClient);
    }
    catch (Exception e) {
      throw new MailException("Looking up SMTP credentials failed", e);
    }

    var session = Session.getDefaultInstance(
      this.options.smtpProperties,
      new Authenticator() {
        @Override
        protected PasswordAuthentication getPasswordAuthentication() {
          return authentication;
        }
      });

    try {
      var message = new MimeMessage(session);
      message.setContent(content);

      message.setFrom(new InternetAddress(
        this.options.senderAddress.value(),
        this.options.senderName));

      for (var recipient : toRecipients){
        message.addRecipient(
          Message.RecipientType.TO,
          new InternetAddress(recipient.value(), recipient.value()));
      }

      for (var recipient : ccRecipients){
        message.addRecipient(
          Message.RecipientType.CC,
          new InternetAddress(recipient.value(), recipient.value()));
      }

      //
      // NB. Setting the Precedence header prevents (some) mail readers to not send
      // out of office-replies.
      //
      message.addHeader("Precedence", "bulk");

      if (flags.contains(Flags.REPLY)) {
        message.setFlag(jakarta.mail.Flags.Flag.ANSWERED, true);
        message.setSubject("Re: " + subject);
      }
      else {
        message.setSubject(subject);
      }

      Transport.send(message);
    }
    catch (MessagingException | UnsupportedEncodingException e) {
      throw new MailException("The mail could not be delivered", e);
    }
  }