[pmg-devel] [PATCH pmg-api v2 1/4] add helper for parsing SA channel.d files

[Stoiko Ivanov]

RHEL/CentOS based SpamAssassin implementations ship an update script,
which reads shell snippets from
/etc/mail/spamassassin/channel.d/*.conf and uses the information there
to update SA rules from the configured channels [0].

Noticed the existence of this directory/mechanism while reading the
announcement of the updatechannel for the KAM ruleset [1].

Parsing the file as text, instead of sourcing it in a shell, since I
hope that the channel files distributed don't rely on running commands
to get the ruleset url and gpg key.

[0] https://src.fedoraproject.org/rpms/spamassassin/blob/master/f/sa-update.cronscript
[1] https://mcgrail.com/template/kam.cf_channel

Signed-off-by: Stoiko Ivanov <s.ivanov at proxmox.com>
---
v1->v2:
* added anchors to all regex-matches

 src/PMG/Utils.pm | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/src/PMG/Utils.pm b/src/PMG/Utils.pm
index d3fae9e..ba6e839 100644
--- a/src/PMG/Utils.pm
+++ b/src/PMG/Utils.pm
@@ -1442,5 +1442,32 @@ sub domain_regex {
     return $regex;
 }
 
+sub local_spamassassin_channels {
+
+    my $res = [];
+
+    my $local_channel_dir = '/etc/mail/spamassassin/channel.d/';
+    my $read_sa_channel = sub {
+	my ($filename) = @_;
+
+	my $channel_file = $local_channel_dir.$filename;
+	my $content = PVE::Tools::file_get_contents($channel_file);
+	my $channel = {
+	    filename => $channel_file,
+	};
+
+	($channel->{keyid}) = ($content =~ /^KEYID=([a-fA-F0-9]+)$/m);
+	die "no KEYID in $filename!\n" if !defined($channel->{keyid});
+	($channel->{channelurl}) = ($content =~ /^CHANNELURL=(.+)$/m);
+	die "no CHANNELURL in $filename!\n" if !defined($channel->{channelurl});
+	($channel->{gpgkey}) = ($content =~ /(?:^|\n)(-----BEGIN PGP PUBLIC KEY BLOCK-----.+-----END PGP PUBLIC KEY BLOCK-----)(?:\n|$)/s);
+	die "no GPG public key in $filename!\n" if !defined($channel->{gpgkey});
+
+	push(@$res, $channel);
+    };
+
+    PVE::Tools::dir_glob_foreach($local_channel_dir, '.*\.conf', $read_sa_channel);
+    return $res;
+}
 
 1;
-- 
2.20.1