[BUG] Attachment Handler does not accomodate more than 40 characters for mime type

[snceaston]

Describe the bug
Using a javascript attachment handler to record the mime type as "application/vnd.openxmlformats-officedocument.wordprocessingml.document" for a docx file causes the following issue:

org.postgresql.util.PSQLException: ERROR: value too long for type character varying(40)
at com.mirth.connect.donkey.server.data.jdbc.JdbcDao.insertMessageAttachment(JdbcDao.java:547)

To Reproduce
This is the current content of the javascript attachment handler:

// Modify the message variable below to create attachments
var filename = ''+$('originalFilename');
if (filename != '') {
	var extension = (filename.substring(filename.lastIndexOf('.')+1, filename.length) || filename).toLowerCase();
	// work our mime type from extension
	switch (extension) {
		case 'pdf': 
			mimetype = 'application/pdf';
			break;
		case 'doc':
			mimetype = 'application/msword';
			break;
		case 'docx':
			mimetype = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
			break;
		case 'gif':
			mimetype = 'image/gif';
			break;
		case 'jpg':
			mimetype = 'image/jpeg';
			break;
		case 'tif':
			mimetype = 'image/tiff';
			break;
		case 'png':
			mimetype = 'image/png';
			break;
		case 'rtf':
			mimetype = 'application/rtf';
			break;
		case 'txt':
			mimetype = 'text/plain';
			break;
		case 'html':
			mimetype = 'text/html';
			break;	
		case 'mht':
			mimetype = 'multipart/related';
			break;
		default: 
			mimetype = '';
	}
}
var attachment = addAttachment(message.toString().replace(/[\r\n]/g,''), mimetype);
var attachmentToken = attachment.getAttachmentId();
return attachmentToken;

Environment (please complete the following information):

• OS: Linux (CentOS)
• Java 1.8.0_171
• Connect Version 3.10.0

Workaround(s)
-- don't save the correct mime type?