Exception processing FETCH from Gmail

[dmjones]

I received an unhandled exception when processing a FETCH operation from my Gmail account.

Here's the line from the server that triggered the error:

* 17989 FETCH (RFC822.SIZE 45339 INTERNALDATE "21-Sep-2018 12:05:58 +0000" FLAGS () ENVELOPE ("Fri, 21 Sep 2018 06:05:58 -0600" "Thank you for your donation to The Brain Tumour Charity" (("JustGiving" NIL "email" "contact.justgiving.com")) (("JustGiving" NIL

This is the command I sent:

var response = await client.fetch(uid.toString(), [
      "FLAGS",
      "INTERNALDATE",
      "RFC822.SIZE",
      "ENVELOPE",
      "BODY",
    ]);

And the exception:

Invalid argument(s): The string given is not a vaild imap list.
#0      ImapConverter.imapListToDartList (file:///Users/duncan/.pub-cache/hosted/pub.dartlang.org/imap_client-0.1.3/lib/src/imap_converter.dart:31:7)
#1      ImapConverter.imapListToDartMap (file:///Users/duncan/.pub-cache/hosted/pub.dartlang.org/imap_client-0.1.3/lib/src/imap_converter.dart:44:26)
#2      _ImapAnalyzer._handleSizeStatusUpdate (file:///Users/duncan/.pub-cache/hosted/pub.dartlang.org/imap_client-0.1.3/lib/src/imap_analyzer.dart:193:29)
#3      _ImapAnalyzer._handleLine (file:///Users/duncan/.pub-cache/hosted/pub.dartlang.org/imap_client-0.1.3/lib/src/imap_analyzer.dart:99:7)
#4      _ImapAnalyzer.analyzeLine (file:///Users/duncan/.pub-cache/hosted/pub.dartlang.org/imap_client-0.1.3/lib/src/imap_analyzer.dart:77:5)
#5      _RootZone.runUnaryGuarded (dart:async/zone.dart:1314:10)
#6      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)

[michaelspiss]

I have a feeling this is due to how parenthesis are handled by the analyzer, but I will have to take a deeper look at this.
Thanks for the detailed report!

[michaelspiss]

The error comes from the imapListToDartList() regex, which states that a list must not have any lists as children - which is the case here. This is fixed by removing "()" from the regex. This leads to another problem, the handling of lists within lists. Plus, I noticed that quotation marks don't keep a string together and prevent it from being split up.

Currently the output would be:

{ 'RFC822.SIZE': '45339', 'INTERNALDATE': '"21-Sep-2018', '12:05:58': '+0000"', 'FLAGS': '()', 'ENVELOPE': '("Fri,', '21': 'Sep', '2018': '06:05:58', '-0600"': '"Thank', 'you': 'for', 'your': 'donation', 'to': 'The', 'Brain': 'Tumour', 'Charity"': '(("JustGiving"', 'NIL': '', '"contact.justgiving.com"))': '(("JustGiving"' }

TODO:

• Handle lists within lists
• Handle strings in quotation marks

[michaelspiss]

This issue has been fixed with the rewrite