Question

I noticed the Opa API has a SMTPServer extension. I’m not entirely sure how this is to be used. Is what functions of email parsing built in and which have to be written in the handler? I’d appreciate a “hello world” style example for this extension.

Answer 1

This code snippet should help you. It is extracted from the code behing http://forum.opalang.org reply-by-email feature:

function convert_to_utf8(s, b) {
    match (Iconv.convert_to_utf8(s, b)) {
    case { some : s }: s
    default: log_error("..."); ""
    }
}

function raw_handler(to, content) {
    ...
    message = Mime.parse(content);
    match (message) {
    case { some : content }:
         content = Mime.get_text(content, convert_to_utf8);
         ....
    default: void
    ...
}

function handler(string from, list(string) to, string raw_content) {
    List.fold({
      function(to, acc) _ = raw_handler(to, raw_content); acc
      }, to, {success})
}

SmtpServer.start(0.0.0.0, 2525, {none}, handler)