MessageBuilder.prepareMailtoBasedMessage constructor

MessageBuilder.prepareMailtoBasedMessage(Uri mailto, MailAddress from)

Convenience method for creating a message based on a mailto URI from the sender specified in from.

The following fields are supported:

* mailto `to` recipient address(es)
* `cc` - CC recipient address(es)
* `subject` - the subject header field
* `body` - the body header field
* `in-reply-to` -  message ID to which the new message is a reply

Implementation

factory MessageBuilder.prepareMailtoBasedMessage(
  Uri mailto,
  MailAddress from,
) {
  final builder = MessageBuilder()
    ..from = [from]
    ..setContentType(MediaType.textPlain, characterSet: CharacterSet.utf8)
    ..transferEncoding = TransferEncoding.automatic;
  final to = <MailAddress>[];
  for (final value in mailto.pathSegments) {
    to.addAll(value.split(',').map((email) => MailAddress(null, email)));
  }
  final queryParameters = mailto.queryParameters;
  for (final key in queryParameters.keys) {
    final value = queryParameters[key];
    switch (key.toLowerCase()) {
      case 'subject':
        builder.subject = value;
        // Defaults to QP-encoding
        builder.subjectEncoding = HeaderEncoding.Q;
        break;
      case 'to':
        if (value != null) {
          to.addAll(
            value.split(',').map((email) => MailAddress(null, email)),
          );
        }
        break;
      case 'cc':
        if (value != null) {
          builder.cc = value
              .split(',')
              .map((email) => MailAddress(null, email))
              .toList();
        }
        break;
      case 'body':
        builder.text = value;
        break;
      case 'in-reply-to':
        builder.setHeader(key, value);
        break;
      default:
        print('unsupported mailto parameter $key=$value');
    }
  }
  builder.to = to;

  return builder;
}