user/dev discussion of public-inbox itself
 help / color / mirror / Atom feed
From: Eric Wong <>
To: Konstantin Ryabitsev <>
Subject: [PATCH] mda: match List-Id insensitively
Date: Mon, 21 Sep 2020 20:58:09 +0000
Message-ID: <20200921205809.GA20588@dcvr> (raw)
In-Reply-To: <20200921180152.uyqluod7qxbwqubo@chatter.i7.local>

Konstantin Ryabitsev <> wrote:
> Hello:
> Attempting to subscribe has highlighted two 
> problems with list-id matching. When the email comes in from the mailing 
> list, the header is set as:
>   List-Id:
> Public-inbox doesn't find this because the above list-id header is not 
> compliant with the RFC (it should be inside angle brackets). However, 
> even when <> are added, the match still fails due to capitalization: the 
> List-Id value from the email header is lc'd first before it is compared 
> with the listid= value in the config file (which isn't lc'd). So, if the 
> config file value is using capitalization, the match will never succeed.

The lack of lc for the -mda code path is definitely a bug and
also inconsistent with -watch behavior.  The patch below fixes
it, thanks.

> I think public-inbox should recognize this list-id header even though 
> it's not compliant, and it should lc both values before comparing them, 
> since the canonical value uses capitalization.

We'll have to think about that one...  It probably needs to be
an case-insensitive match of the entire header contents to avoid
inadvertant substring matching.  RFC 2919 allows a phrase
element before the list-id.

With -watch, using ""
(case-sensitive) can workaround it, but -mda doesn't support
watchheader or anything like it right now...

Subject: [PATCH] mda: match List-Id insensitively

This follows -watch commit b70473ab8296d31ebb600adb4fa8fe0ac5935ca8
to match List-Id headers case-insensitively.

Reported-by: Konstantin Ryabitsev <>
 lib/PublicInbox/ | 3 ++-
 t/mda.t                   | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/PublicInbox/ b/lib/PublicInbox/
index abc525db..d57c361a 100644
--- a/lib/PublicInbox/
+++ b/lib/PublicInbox/
@@ -424,8 +424,9 @@ EOF
 		$self->{-no_obfuscate}->{$lc_addr} = 1;
 	if (my $listids = $ibx->{listid}) {
+		# RFC2919 section 6 stipulates "case insensitive equality"
 		foreach my $list_id (@$listids) {
-			$self->{-by_list_id}->{$list_id} = $ibx;
+			$self->{-by_list_id}->{lc($list_id)} = $ibx;
 	if (my $ng = $ibx->{newsgroup}) {
diff --git a/t/mda.t b/t/mda.t
index c7caf3e0..c5b35eec 100644
--- a/t/mda.t
+++ b/t/mda.t
@@ -261,7 +261,7 @@ Subject: this message will be trained as spam
 Date: Thu, 01 Jan 1970 00:00:00 +0000
-	xsys(qw(git config --file), $pi_config, "$cfgpfx.listid", $list_id);
+	xsys(qw(git config --file), $pi_config, "$cfgpfx.listid", uc $list_id);
 	$? == 0 or die "failed to set listid $?";
 	ok(run_script(['-mda'], undef, { 0 => \$in }),
 		'mda OK with List-Id match');

      reply	other threads:[~2020-09-21 20:58 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-21 18:01 2 problems with listid matching Konstantin Ryabitsev
2020-09-21 20:58 ` Eric Wong [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

  List information:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200921205809.GA20588@dcvr \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

user/dev discussion of public-inbox itself

This inbox may be cloned and mirrored by anyone:

	git clone --mirror
	git clone --mirror http://czquwvybam4bgbro.onion/meta
	git clone --mirror http://hjrcffqmbrq6wope.onion/meta
	git clone --mirror http://ou63pmih66umazou.onion/meta

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V1 meta meta/ \
	public-inbox-index meta

Example config snippet for mirrors.
Newsgroups are available over NNTP:
 note: .onion URLs require Tor:

code repositories for the project(s) associated with this inbox:

AGPL code for this site: git clone