# Copyright (C) 2014-2016 all contributors
# License: AGPL-3.0+
# two-step linkification.
# intended usage is in the following order:
#
# linkify_1
#
# linkify_2
#
# Maybe this could be done more efficiently...
package PublicInbox::Linkify;
use strict;
use warnings;
use Digest::SHA qw/sha1_hex/;
my $SALT = rand;
my $LINK_RE = qr{\b((?:ftps?|https?|nntps?|gopher)://
[\@:\w\.-]+/
?[!,:~\$\@\w\+\&\?\.\%\;/#=-]*)}x;
sub new { bless {}, shift }
sub linkify_1 {
my ($self, $s) = @_;
$s =~ s!$LINK_RE!
my $url = $1;
my $end = '';
# it's fairly common to end URLs in messages with
# '.', ',' or ';' to denote the end of a statement;
# assume the intent was to end the statement/sentence
# in English
if ($url =~ s/([\.,;])\z//) {
$end = $1;
}
# salt this, as this could be exploited to show
# links in the HTML which don't show up in the raw mail.
my $key = sha1_hex($url . $SALT);
# only escape ampersands, others do not match LINK_RE
$url =~ s/&/&/g;
$self->{$key} = $url;
'PI-LINK-'. $key . $end;
!ge;
$s;
}
sub linkify_2 {
my ($self, $s) = @_;
# Added "PI-LINK-" prefix to avoid false-positives on git commits
$s =~ s!\bPI-LINK-([a-f0-9]{40})\b!
my $key = $1;
my $url = $self->{$key};
if (defined $url) {
"$url";
} else {
# false positive or somebody tried to mess with us
$key;
}
!ge;
$s;
}
1;