MailKit.Net.Imap.ImapProtocolException : 'Syntax error in BODY. Unexpected token: ')''

[bleece]

Describe the bug
When I try to fetch messages "client.Inbox.Fetch(startIndex, -1, request, cancel.Token);" I got error

Platform (please complete the following information):
Microsoft.NETCore.App.Ref\7.0.20

Exception
à MailKit.Net.Imap.ImapUtils.ReadStringToken(ImapEngine engine, String format, CancellationToken cancellationToken)
à MailKit.Net.Imap.ImapUtils.ParseContentType(ImapEngine engine, String format, CancellationToken cancellationToken)
à MailKit.Net.Imap.ImapUtils.ParseBody(ImapEngine engine, String format, String path, CancellationToken cancellationToken)
à MailKit.Net.Imap.ImapUtils.ParseBody(ImapEngine engine, String format, String path, CancellationToken cancellationToken)
à MailKit.Net.Imap.ImapUtils.ParseMultipart(ImapEngine engine, String format, String path, CancellationToken cancellationToken)
à MailKit.Net.Imap.ImapFolder.ParseSummaryItems(ImapEngine engine, MessageSummary message, FetchSummaryItemsCompletedCallback completed, CancellationToken cancellationToken)
à MailKit.Net.Imap.ImapFolder.UntaggedFetchSummaryItemsHandler(ImapEngine engine, ImapCommand ic, Int32 index, Boolean doAsync)
à MailKit.Net.Imap.ImapEngine.ProcessUntaggedResponse(CancellationToken cancellationToken)
à MailKit.Net.Imap.ImapCommand.Step()
à MailKit.Net.Imap.ImapEngine.Iterate()
à MailKit.Net.Imap.ImapEngine.Run(ImapCommand ic)
à MailKit.Net.Imap.ImapFolder.Fetch(Int32 min, Int32 max, IFetchRequest request, CancellationToken cancellationToken)
à AlloVoisins.IdleClient.d__26.MoveNext() dans **\IdleClient.cs :ligne 95

To Reproduce
Steps to reproduce the behavior:
IList? fetched = null;
fetched = client.Inbox.Fetch(startIndex, -1, request, cancel.Token);

Expected behavior
Get all messages

client = new ImapClient(new ProtocolLogger(Console.OpenStandardError()));

     async Task ReconnectAsync()
     {
         if (!client.IsConnected)
             await client.ConnectAsync(_host, _port, sslOptions, cancel.Token);

         if (!client.IsAuthenticated)
         {
             await client.AuthenticateAsync(_gmailUsername, _gmailPassword, cancel.Token);
             await client.Inbox.OpenAsync(FolderAccess.ReadOnly, cancel.Token);
         }
     }


 IList<IMessageSummary>? fetched = null;
 fetched = client.Inbox.Fetch(startIndex, -1, request, cancel.Token);

[jstedfast]

I'm going to need the IMAP protocol log (which was dumped to the console - just copy & paste it here)

[bleece]

I'm going to need the IMAP protocol log (which was dumped to the console - just copy & paste it here)

Hello,
I just anonymized the confidential information

Connected to imaps://imap.gmail.com:993/
S: * OK Gimap ready for requests from 2a01:e0a:130:47d0:44b1:9cce:67e9:5b34 u9mb76462483wmq
C: B00000000 CAPABILITY
S: * CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 XYZZY SASL-IR AUTH=XOAUTH2 AUTH=PLAIN AUTH=PLAIN-CLIENTTOKEN AUTH=OAUTHBEARER
S: B00000000 OK Thats all she wrote! u9mb76462483wmq
C: B00000001 AUTHENTICATE PLAIN ********
S: * CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 UIDPLUS COMPRESS=DEFLATE ENABLE MOVE CONDSTORE ESEARCH UTF8=ACCEPT LIST-EXTENDED LIST-STATUS LITERAL- SPECIAL-USE APPENDLIMIT=35651584
S: B00000001 OK ---.---87@gmail.com authenticated (Success)
C: B00000002 NAMESPACE
S: * NAMESPACE (("" "/")) NIL NIL
S: B00000002 OK Success
C: B00000003 LIST "" "INBOX" RETURN (SUBSCRIBED CHILDREN)
S: * LIST (\HasNoChildren \Subscribed) "/" "INBOX"
S: B00000003 OK Success
C: B00000004 LIST (SPECIAL-USE) "" "*" RETURN (SUBSCRIBED CHILDREN)
S: * LIST (\Drafts \HasNoChildren \Subscribed) "/" "[Gmail]/Brouillons"
S: * LIST (\HasNoChildren \Subscribed \Trash) "/" "[Gmail]/Corbeille"
S: * LIST (\HasNoChildren \Sent \Subscribed) "/" "[Gmail]/Messages envoy&AOk-s"
S: * LIST (\HasNoChildren \Junk \Subscribed) "/" "[Gmail]/Spam"
S: * LIST (\Flagged \HasNoChildren \Subscribed) "/" "[Gmail]/Suivis"
S: * LIST (\All \HasNoChildren \Subscribed) "/" "[Gmail]/Tous les messages"
S: B00000004 OK Success
C: B00000005 LIST "" "[Gmail]" RETURN (SUBSCRIBED CHILDREN)
S: * LIST (\HasChildren \NonExistent \Subscribed) "/" "[Gmail]"
S: B00000005 OK Success
C: B00000006 EXAMINE INBOX (CONDSTORE)
S: * FLAGS (\Answered \Flagged \Draft \Deleted \Seen $Forwarded $Junk $NotJunk $NotPhishing $Phishing JunkRecorded NotJunk)
S: * OK [PERMANENTFLAGS ()] Flags permitted.
S: * OK [UIDVALIDITY 1] UIDs valid.
S: * 4615 EXISTS
S: * 0 RECENT
S: * OK [UIDNEXT 7821] Predicted next UID.
S: * OK [HIGHESTMODSEQ 814976]
S: B00000006 OK [READ-ONLY] INBOX selected. (Success)
C: B00000007 FETCH 1:* (UID FLAGS INTERNALDATE RFC822.SIZE ENVELOPE BODY)
S: * 52 FETCH (UID 117 RFC822.SIZE 66672 MODSEQ (19066) INTERNALDATE "04-Jan-2015 21:17:33 +0000" FLAGS ($NotJunk NotJunk \Seen) ENVELOPE ("Sun, 4 Jan 2015 22:15:26 +0100" "Re: MP 2/3" (("--- ---" NIL "---.---87" "gmail.com")) (("--- ---" NIL "---.---87" "gmail.com")) (("--- ---" NIL "---.---87" "gmail.com")) (("--- ---" NIL "---.---87" "gmail.com")) NIL NIL "<D4A31488-8A32-4DC3-AC6C-984054129154@gmail.com>" "<287586B1-4EFD-4D2F-8118-2E615F0D7374@gmail.com>") BODY (("TEXT" "PLAIN" ("CHARSET" "windows-1252") NIL NIL "QUOTED-PRINTABLE" 2117 63)(("TEXT" "HTML" ("CHARSET" "us-ascii") NIL NIL "7BIT" 147 0)("APPLICATION" "PDF" ("NAME" "IR-Justif-91-2013-14940541938365.pdf") NIL NIL "BASE64" 53522)("TEXT" "HTML" ("CHARSET" "windows-1252") NIL NIL "QUOTED-PRINTABLE" 9175 137) "MIXED") "ALTERNATIVE"))
S: * 53 FETCH (UID 118 RFC822.SIZE 10416306 MODSEQ (19150) INTERNALDATE "04-Jan-2015 21:18:59 +0000" FLAGS ($NotJunk NotJunk \Seen) ENVELOPE ("Sun, 4 Jan 2015 22:15:40 +0100" "Re: MP 3/3" (("--- ---" NIL "---.---87" "gmail.com")) (("--- ---" NIL "---.---87" "gmail.com")) (("--- ---" NIL "---.---87" "gmail.com")) (("--- ---" NIL "---.---87" "gmail.com")) NIL NIL "<D4A31488-8A32-4DC3-AC6C-984054129154@gmail.com>" "<35C4999E-DE9E-4B82-9D8C-982FEA73DAAF@gmail.com>") BODY (("TEXT" "PLAIN" ("CHARSE

[jstedfast]

I probably won't be able to get to this this week, but I should have time this weekend/next week to dig into this.

I suspect the issue is with: "ALTERNATIVE"))

MailKit likely expects more tokens after the "ALTERNATIVE" but before the ).

I have to verify the syntax, but I'm pretty sure that the syntax specifies that there must be a few more tokens there such as the Content-Type parameters and some of the other Content-* header values (Location, Language, etc).

[bleece]

I probably won't be able to get to this this week, but I should have time this weekend/next week to dig into this.

I suspect the issue is with: "ALTERNATIVE"))

MailKit likely expects more tokens after the "ALTERNATIVE" but before the ).

I have to verify the syntax, but I'm pretty sure that the syntax specifies that there must be a few more tokens there such as the Content-Type parameters and some of the other Content-* header values (Location, Language, etc).

Ok, thanks for your feedback. I look forward to hearing from you. Have a good evening.

[jstedfast]

What version of MailKit are you using? I am not able to reproduce this.

[bleece]

What version of MailKit are you using? I am not able to reproduce this.

I am using 4.8.0

[jstedfast]

Thanks. I'll try taking another look at this.

[jstedfast]

Does this happen every time?

What if you change your requested items to just MessageSummaryItems.Body? Does that still fail?

I'm wondering if there's a buffering issue because I still can't reproduce this.

[bleece]

Does this happen every time?
> Yes it happens every time
What if you change your requested items to just MessageSummaryItems.Body? Does that still fail?
> Same result
I'm wondering if there's a buffering issue because I still can't reproduce this.
> Too many messages to load?

[jstedfast]

If I feed your log into my unit test, it parses the BODY response just fine. No exceptions.

[bleece]

If I feed your log into my unit test, it parses the BODY response just fine. No exceptions.

my last log :
imap-th10-20h56.log

[jstedfast]

I can repro now - I'll look at debugging it this weekend.

[bleece]

I can repro now - I'll look at debugging it this weekend.

Great, thanks!