diff options
Diffstat (limited to 'lib/PublicInbox/ContentId.pm')
-rw-r--r-- | lib/PublicInbox/ContentId.pm | 67 |
1 files changed, 57 insertions, 10 deletions
diff --git a/lib/PublicInbox/ContentId.pm b/lib/PublicInbox/ContentId.pm index 279eec0c..b1d27eb8 100644 --- a/lib/PublicInbox/ContentId.pm +++ b/lib/PublicInbox/ContentId.pm @@ -7,10 +7,19 @@ use warnings; use base qw/Exporter/; our @EXPORT_OK = qw/content_id content_digest/; use PublicInbox::MID qw(mids references); +use PublicInbox::MsgIter; # not sure if less-widely supported hash families are worth bothering with use Digest::SHA; +sub digest_addr ($$$) { + my ($dig, $h, $v) = @_; + $v =~ tr/"//d; + $v =~ s/@([a-z0-9\_\.\-\(\)]*([A-Z])\S*)/'@'.lc($1)/ge; + utf8::encode($v); + $dig->add("$h\0$v\0"); +} + sub content_digest ($) { my ($mime) = @_; my $dig = Digest::SHA->new(256); @@ -27,24 +36,62 @@ sub content_digest ($) { } foreach my $mid (@{references($hdr)}) { next if $seen{$mid}; - $dig->add('ref: '.$mid); + $dig->add("ref\0$mid\0"); } # Only use Sender: if From is not present foreach my $h (qw(From Sender)) { - my @v = $hdr->header_raw($h); + my @v = $hdr->header($h); if (@v) { - $dig->add("$h: $_") foreach @v; - last; + digest_addr($dig, $h, $_) foreach @v; } } - - # Content-* headers are often no-ops, so maybe we don't need them - foreach my $h (qw(Subject Date To Cc)) { - my @v = $hdr->header_raw($h); - $dig->add("$h: $_") foreach @v; + foreach my $h (qw(Subject Date)) { + my @v = $hdr->header($h); + foreach my $v (@v) { + utf8::encode($v); + $dig->add("$h\0$v\0"); + } + } + # Some mail processors will add " to unquoted names that were + # not in the original message. For the purposes of deduplication, + # do not take it into account: + foreach my $h (qw(To Cc)) { + my @v = $hdr->header($h); + digest_addr($dig, $h, $_) foreach @v; } - $dig->add($mime->body_raw); + msg_iter($mime, sub { + my ($part, $depth, @idx) = @{$_[0]}; + $dig->add("\0$depth:".join('.', @idx)."\0"); + my $fn = $part->filename; + if (defined $fn) { + utf8::encode($fn); + $dig->add("fn\0$fn\0"); + } + my @d = $part->header('Content-Description'); + foreach my $d (@d) { + utf8::encode($d); + $dig->add("d\0$d\0"); + } + $dig->add("b\0"); + my $ct = $part->content_type || 'text/plain'; + my $s = eval { $part->body_str }; + if ($@ && $ct =~ m!\btext/plain\b!i) { + # Try to assume UTF-8 because Alpine + # seems to do wacky things and set + # charset=X-UNKNOWN + $part->charset_set('UTF-8'); + $s = eval { $part->body_str }; + } + if (defined $s) { + $s =~ s/\r\n/\n/gs; + $s =~ s/\s*\z//s; + utf8::encode($s); + } else { + $s = $part->body; + } + $dig->add($s); + }); $dig; } |