-# Copyright (C) 2018 all contributors <meta@public-inbox.org>
+# Copyright (C) 2018-2019 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# Various date/time-related functions
package PublicInbox::MsgTime;
use strict;
use warnings;
use base qw(Exporter);
-our @EXPORT_OK = qw(msg_timestamp);
-use Date::Parse qw(str2time);
-use Time::Zone qw(tz_offset);
+our @EXPORT_OK = qw(msg_timestamp msg_datestamp);
+use Date::Parse qw(str2time strptime);
-sub msg_timestamp ($) {
+sub str2date_zone ($) {
+ my ($date) = @_;
+
+ my $ts = str2time($date);
+ return undef unless(defined $ts);
+
+ # off is the time zone offset in seconds from GMT
+ my ($ss,$mm,$hh,$day,$month,$year,$off) = strptime($date);
+ return undef unless(defined $off);
+
+ # Compute the time zone from offset
+ my $sign = ($off < 0) ? '-' : '+';
+ my $hour = abs(int($off / 3600));
+ my $min = ($off / 60) % 60;
+ my $zone = sprintf('%s%02d%02d', $sign, $hour, $min);
+
+ # "-1200" is the furthest westermost zone offset,
+ # but git fast-import is liberal so we use "-1400"
+ if ($zone >= 1400 || $zone <= -1400) {
+ warn "bogus TZ offset: $zone, ignoring and assuming +0000\n";
+ $zone = '+0000';
+ }
+ [$ts, $zone];
+}
+
+sub time_response ($) {
+ my ($ret) = @_;
+ wantarray ? @$ret : $ret->[0];
+}
+
+sub msg_received_at ($) {
my ($hdr) = @_; # Email::MIME::Header
- my ($ts, $zone);
- my $mid;
my @recvd = $hdr->header_raw('Received');
+ my ($ts);
foreach my $r (@recvd) {
- $zone = undef;
- $r =~ /\s*(\d+\s+[[:alpha:]]+\s+\d{2,4}\s+
- \d+\D\d+(?:\D\d+)\s+([\+\-]\d+))/sx or next;
- $zone = $2;
- $ts = eval { str2time($1) } and last;
- $mid ||= $hdr->header_raw('Message-ID');
+ $r =~ /\s*([0-9]+\s+[a-zA-Z]+\s+[0-9]{2,4}\s+
+ [0-9]+[^0-9][0-9]+(?:[^0-9][0-9]+)
+ \s+([\+\-][0-9]+))/sx or next;
+ $ts = eval { str2date_zone($1) } and return $ts;
+ my $mid = $hdr->header_raw('Message-ID');
warn "no date in $mid Received: $r\n";
}
- unless (defined $ts) {
- my @date = $hdr->header_raw('Date');
- foreach my $d (@date) {
- $zone = undef;
- $ts = eval { str2time($d) };
- if ($@) {
- $mid ||= $hdr->header_raw('Message-ID');
- warn "bad Date: $d in $mid: $@\n";
- } elsif ($d =~ /\s+([\+\-]\d+)\s*\z/) {
- $zone = $1;
- }
+ undef;
+}
+
+sub msg_date_only ($) {
+ my ($hdr) = @_; # Email::MIME::Header
+ my @date = $hdr->header_raw('Date');
+ my ($ts);
+ foreach my $d (@date) {
+ # Y2K problems: 3-digit years
+ $d =~ s!([A-Za-z]{3}) ([0-9]{3}) ([0-9]{2}:[0-9]{2}:[0-9]{2})!
+ my $yyyy = $2 + 1900; "$1 $yyyy $3"!e;
+ $ts = eval { str2date_zone($d) } and return $ts;
+ if ($@) {
+ my $mid = $hdr->header_raw('Message-ID');
+ warn "bad Date: $d in $mid: $@\n";
}
}
- $ts = time unless defined $ts;
- return $ts unless wantarray;
+ undef;
+}
- $zone ||= '+0000';
- # "-1200" is the furthest westermost zone offset,
- # but git fast-import is liberal so we use "-1400"
- if ($zone >= 1400 || $zone <= -1400) {
- warn "bogus TZ offset: $zone, ignoring and assuming +0000\n";
- $zone = '+0000';
- }
- ($ts, $zone);
+# Favors Received header for sorting globally
+sub msg_timestamp ($) {
+ my ($hdr) = @_; # Email::MIME::Header
+ my $ret;
+ $ret = msg_received_at($hdr) and return time_response($ret);
+ $ret = msg_date_only($hdr) and return time_response($ret);
+ wantarray ? (time, '+0000') : time;
+}
+
+# Favors the Date: header for display and sorting within a thread
+sub msg_datestamp ($) {
+ my ($hdr) = @_; # Email::MIME::Header
+ my $ret;
+ $ret = msg_date_only($hdr) and return time_response($ret);
+ $ret = msg_received_at($hdr) and return time_response($ret);
+ wantarray ? (time, '+0000') : time;
}
1;