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|
#!/usr/bin/perl -T
#----------------------------------------------------------------------
# A minimal IMAP4 client for QRESYNC-capable servers
# Copyright © 2015 Guilhem Moulin <guilhem@fripost.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#----------------------------------------------------------------------
use strict;
use warnings;
our $VERSION = '0.1';
my $NAME = 'imapsync';
use Getopt::Long qw/:config posix_default no_ignore_case gnu_compat
bundling auto_version/;
use List::Util 'first';
use DBI ();
use lib 'lib';
use Net::IMAP::Sync qw/read_config compact_set $IMAP_text $IMAP_cond/;
# Clean up PATH
$ENV{PATH} = join ':', qw{/usr/local/bin /usr/bin /bin};
delete @ENV{qw/IFS CDPATH ENV BASH_ENV/};
my %CONFIG;
sub usage(;$) {
my $rv = shift // 0;
print STDERR "TODO $NAME usage\n";
exit $rv;
}
usage(1) unless GetOptions(\%CONFIG, qw/debug help|h config=s quiet|q oneshot|1 check/);
usage(0) if $CONFIG{help};
my $CONF = read_config( delete $CONFIG{config} // $NAME
, [qw/_ local remote/]
, database => qr/\A(\P{Control}+)\z/ );
my ($DBFILE, $LOCKFILE);
{
$DBFILE = $CONF->{_}->{database} if defined $CONF->{_};
$DBFILE //= $CONF->{remote}->{host}.'.db' if defined $CONF->{remote};
$DBFILE //= $CONF->{local}->{host}. '.db' if defined $CONF->{local};
die "Missing option database" unless defined $DBFILE;
unless ($DBFILE =~ /\A\//) {
my $dir = ($ENV{XDG_DATA_HOME} // "$ENV{HOME}/.local/share") .'/'. $NAME;
$dir =~ /\A(\/\p{Print}+)\z/ or die "Insecure $dir";
$dir = $1;
$DBFILE = $dir .'/'. $DBFILE;
unless (-d $dir) {
mkdir $dir, 0700 or die "Cannot mkdir $dir: $!\n";
}
}
$LOCKFILE = $DBFILE =~ s/([^\/]+)\z/.$1.lck/r;
}
my $DBH;
# Clean after us
sub cleanup() {
print STDERR "Cleaning up...\n" if $CONFIG{debug};
unlink $LOCKFILE if defined $LOCKFILE and -f $LOCKFILE;
$DBH->disconnect() if defined $DBH;
}
$SIG{$_} = sub { cleanup(); print STDERR "$!\n"; exit 1; } foreach qw/INT TERM/;
$SIG{$_} = sub { cleanup(); print STDERR "$!\n"; exit 0; } foreach qw/HUP/;
#############################################################################
# Lock the database
{
if (-f $LOCKFILE) {
open my $lock, '<', $LOCKFILE or die "Cannot open $LOCKFILE: $!\n";
my $pid = <$lock>;
close $lock;
chomp $pid;
my $msg = "LOCKFILE '$LOCKFILE' exists.";
$msg .= " (Is PID $pid running?)" if defined $pid and $pid =~ /^[0-9]+$/;
die $msg, "\n";
}
open my $lock, '>', $LOCKFILE or die "Cannot open $LOCKFILE: $!\n";
print $lock $$, "\n";
close $lock;
}
#############################################################################
# Open the database and create tables
$DBH = DBI::->connect("dbi:SQLite:dbname=$DBFILE", undef, undef, {
AutoCommit => 0,
RaiseError => 1,
sqlite_see_if_its_a_number => 1, # see if the bind values are numbers or not
});
$DBH->do('PRAGMA foreign_keys = ON');
{
my @schema = (
mailboxes => [
q{idx INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT},
q{mailbox TEXT NOT NULL CHECK (mailbox != '') UNIQUE},
q{subscribed BOOLEAN NOT NULL}
],
local => [
q{idx INTEGER NOT NULL PRIMARY KEY REFERENCES mailboxes(idx)},
q{UIDVALIDITY UNSIGNED INT NOT NULL CHECK (UIDVALIDITY > 0)},
q{UIDNEXT UNSIGNED INT NOT NULL}, # 0 initially
q{HIGHESTMODSEQ UNSIGNED BIGINT NOT NULL} # 0 initially
# one-to-one correspondence between local.idx and remote.idx
],
remote => [
q{idx INTEGER NOT NULL PRIMARY KEY REFERENCES mailboxes(idx)},
q{UIDVALIDITY UNSIGNED INT NOT NULL CHECK (UIDVALIDITY > 0)},
q{UIDNEXT UNSIGNED INT NOT NULL}, # 0 initially
q{HIGHESTMODSEQ UNSIGNED BIGINT NOT NULL} # 0 initially
# one-to-one correspondence between local.idx and remote.idx
],
mapping => [
q{idx INTEGER NOT NULL REFERENCES mailboxes(idx)},
q{lUID UNSIGNED INT NOT NULL CHECK (lUID > 0)},
q{rUID UNSIGNED INT NOT NULL CHECK (rUID > 0)},
q{PRIMARY KEY (idx,lUID)},
q{UNIQUE (idx,rUID)}
# also, lUID < local.UIDNEXT and rUID < remote.UIDNEXT (except for interrupted syncs)
# mapping.idx must be found among local.idx (and remote.idx)
],
);
# Invariants:
# * UIDVALIDITY never changes.
# * All changes for UID < {local,remote}.UIDNEXT and MODSEQ <
# {local,remote}.HIGHESTMODSEQ have been propagated.
# * No local (resp. remote) new message will ever have a UID <= local.UIDNEXT
# (resp. <= remote.UIDNEXT).
# * Any idx in `local` must be present in `remote` and vice-versa.
# * Any idx in `mapping` must be present in `local` and `remote`.
while (@schema) {
my $table = shift @schema;
my $schema = shift @schema;
my $sth = $DBH->table_info(undef, undef, $table, 'TABLE', {Escape => 1});
my $row = $sth->fetch();
die if defined $sth->fetch(); # sanity check
unless (defined $row) {
$DBH->do("CREATE TABLE $table (".join(', ',@$schema).")");
$DBH->commit();
}
}
}
sub msg($@) {
my $name = shift;
return unless @_;
my $prefix = defined $name ? "$name: " : '';
print STDERR $prefix, @_, "\n";
}
#############################################################################
# Connect to the local and remote IMAP servers
my $IMAP;
foreach my $name (qw/local remote/) {
my %config = %{$CONF->{$name}};
$config{$_} = $CONFIG{$_} foreach keys %CONFIG;
$config{enable} = 'QRESYNC';
$config{name} = $name;
$IMAP->{$name} = { client => Net::IMAP::Sync::->new(%config) };
my $client = $IMAP->{$name}->{client};
die "Non $_-capable IMAP server.\n" foreach $client->incapable(qw/LIST-EXTENDED LIST-STATUS UIDPLUS/);
# XXX We should start by listing all mailboxes matching the user's LIST
# criterion, then issue "SET NOTIFY (mailboxes ... (...))". But this
# crashes the IMAP client:
# http://dovecot.org/pipermail/dovecot/2015-July/101473.html
#my $mailboxes = $client->list((uc $config{'subscribed-only'} eq 'TRUE' ? '(SUBSCRIBED)' : '' )
# .$config{mailboxes}, 'SUBSCRIBED');
# $client->notify('SELECTED', 'MAILBOXES ('.join(' ', keys %$mailboxes).')');
$client->notify(qw/SELECTED SUBSCRIBED/) unless $CONFIG{oneshot};
# XXX We shouldn't need to ask for STATUS responses here, and use
# NOTIFY's STATUS indicator instead. However Dovecot violates RFC
# 5464: http://dovecot.org/pipermail/dovecot/2015-July/101474.html
@{$IMAP->{$name}}{qw/mailboxes delims/} = $client->list(q{"" "*"}, 'SUBSCRIBED', 'STATUS (UIDVALIDITY UIDNEXT HIGHESTMODSEQ)' );
}
#############################################################################
# Synchronize mailbox and subscription lists
sub make_tree(%);
sub print_tree($%);
sub mv_tree($$$%);
sub sync_tree($$%);
# Take a hash of delimiters, and recursively build a tree out of it.
# For instance ( a => "/", b => "/", "a/c" => ".", "a/c.d" => "/", "a/d" => ".")
# is transformed into the hash reference
# { b => {},
# { a => { "/c" => { ".d" => {} } }
# , "/d" => {}
# }
# }
sub make_tree(%) {
my %delims = @_;
my @list = sort {length($a) <=> length($b)} keys %delims;
my %tree;
foreach my $x (@list) {
next unless exists $delims{$x}; # already a children of something
my %children;
foreach (keys %delims) {
next unless defined $delims{$x} and s/\A\Q$x$delims{$x}\E/$delims{$x}/;
$children{$_} = delete $delims{"$x$_"};
}
delete $delims{$x};
$tree{$x} = make_tree(%children);
}
return \%tree;
}
#sub print_tree($%) {
# my $indent = shift;
# my %tree = @_;
# while (my ($root, $children) = each %tree) {
# print " "x$indent, '|- ', $root, "\n";
# print_tree($indent+2, %$children);
# }
#}
# Retrun true if $mailbox exists for $name that is, if doesn't have the
# '\NonExistent' flag set.
sub exists_mbx($$) {
my $name = shift;
my $mailbox = shift;
my $flags = $IMAP->{$name}->{mailboxes}->{$mailbox};
return (defined $flags and !grep {lc $_ eq lc '\NonExistent'} @$flags) ? 1 : 0;
}
# Retrun true if $mailbox is subscribed for $name.
sub subscribed_mbx($$) {
my $name = shift;
my $mailbox = shift;
my $flags = $IMAP->{$name}->{mailboxes}->{$mailbox};
return (defined $flags and grep {lc $_ eq lc '\Subscribed'} @$flags) ? 1 : 0;
}
# Rename a root recursively in a tree
sub mv_tree($$$%) {
my ($mailboxes, $mbx, $mbx2, %children) = @_;
$mailboxes->{$mbx2} = delete $mailboxes->{$mbx};
while (my ($root, $children) = each %children) {
mv_tree($mailboxes, $mbx.$root, $mbx2.$root, %children);
}
}
# Syncronize mailbox list
# XXX DELETE and RENAME not tested
sub sync_tree($$%) {
my ($sth, $mbx, %children) = @_;
my %exists = map { $_ => exists_mbx($_,$mbx) } qw/local remote/;
my $rv = 0;
if ($exists{local} xor $exists{remote}) {
my ($exists,$missing) = $exists{local} ? ('local','remote') : ('remote','local');
my ($sth_by_mbx, $sth_by_uidvalidity) = @$sth{($missing.'_by_mbx', $exists.'_by_uidvalidity')};
# check if there is an entry matching $mbx for $missing in the database
$sth_by_mbx->execute($mbx);
my $row_by_mbx = $sth_by_mbx->fetch();
die if defined $sth_by_mbx->fetch(); # sanity check
if (defined $row_by_mbx) {
# $mbx was seen on $missing during the previous round: it
# has either been DELETEd or RENAMEd to another name on
# $missing.
my %uidvalidities = $IMAP->{$missing}->{client}->uidvalidity();
my ($idx,$uidvalidity) = @$row_by_mbx;
my @mbx2 = grep { $uidvalidities{$_} == $uidvalidity and !exists_mbx($exists,$_) }
keys %uidvalidities;
if ($#mbx2 > 0) {
# XXX this is allowed by RFC3501, but we can't guess...
msg($missing, "Multiple mailboxes have same UIDVALIDITY $uidvalidity: ",
join(',',@mbx2), "\n",
"Dunno which one $mbx should be renamed to.");
exit 1;
}
elsif (@mbx2) {
# $mbx's known (from the DB) UIDVALIDITY is that of
# $missing's $mbx2, which is not in the database and
# doesn't exist on $exists
msg($exists, "Rename mailbox $mbx to $mbx2[0]");
$sth->{rename}->execute($mbx2[0],$idx);
$IMAP->{$exists}->{client}->rename($mbx, $mbx2[0]);
$DBH->commit();
mv_tree($IMAP->{$exists}->{mailboxes}, $mbx, $mbx2[0], %children);
$mbx = $mbx2[0];
}
else {
# $mbx's known (from the DB) UIDVALIDITY on $missing
# was not found in any of $missing's mailboxes.
msg($exists, "Delete mailbox $mbx");
push @{$IMAP->{$exists}->{mailboxes}->{$mbx}}, '\NonExistent';
$IMAP->{$exists}->{client}->delete($mbx);
}
}
else {
# $mbx was never seen on $missing: it has either been
# CREATEd or RENAMEd from another name on $exists.
my ($idx,$mbx2);
if (defined (my $uidvalidity = $IMAP->{$exists}->{client}->uidvalidity($mbx))) {
$sth_by_uidvalidity->execute($uidvalidity);
my $by_uidvalidity = $sth_by_uidvalidity->fetchall_arrayref();
if (defined $by_uidvalidity and $#$by_uidvalidity > 0) {
# XXX this is allowed by RFC3501, but we can't guess...
my @mbx2 = map {$_->[1]} @$by_uidvalidity;
msg($exists, "Multiple mailboxes have same UIDVALIDITY $uidvalidity: ",
join(',',@mbx2), "\n",
"Dunno which one $mbx should be renamed to.");
exit 1;
}
($idx,$mbx2) = @{$by_uidvalidity->[0]} if defined $by_uidvalidity and @$by_uidvalidity;
}
if (defined $mbx2) {
# $mbx's UIDVALIDITY on $exists can be found in the
# database as associated with $mbx2, which exists on
# $missing but not on $exists
msg($missing, "Rename mailbox $mbx2 to $mbx");
$sth->{rename}->execute($mbx,$idx);
$IMAP->{$missing}->{client}->rename($mbx2, $mbx);
$DBH->commit();
mv_tree($IMAP->{$missing}->{mailboxes}, $mbx2, $mbx, %children);
}
else {
# $mbx's UIDVALIDITY on $exists has never been found in
# the database.
msg($missing, "Create mailbox $mbx");
$IMAP->{$missing}->{mailboxes}->{$mbx} =
grep {lc $_ ne lc '\NonExistent'} @{$IMAP->{$missing}->{mailboxes}->{$mbx} // []};
$IMAP->{$missing}->{client}->create($mbx);
}
}
$rv = 1;
}
while (my ($root, $children) = each %children) {
my $r = sync_tree($sth, $mbx.$root, %$children);
$rv ||= $r;
}
return $rv;
}
{
my %delims;
foreach my $name (qw/local remote/) {
while (my ($mbx, $sep) = each %{$IMAP->{$name}->{delims}}) {
if (!exists $delims{$mbx}) {
$delims{$mbx} = $sep;
} else {
die "Hierarchy delimeters for mailbox $mbx don't match!\n"
unless (!defined $sep and !defined $delims{$mbx}) or
(defined $sep and defined $delims{$mbx} and $sep eq $delims{$mbx});
}
}
}
my $tree = make_tree(%delims);
my %sth;
$sth{$_.'_by_mbx'} = $DBH->prepare("SELECT idx,UIDVALIDITY FROM mailboxes NATURAL JOIN $_ WHERE mailbox = ?")
foreach qw/local remote/;
$sth{$_.'_by_uidvalidity'} = $DBH->prepare("SELECT idx,mailbox FROM mailboxes NATURAL JOIN $_ WHERE UIDVALIDITY = ?")
foreach qw/local remote/;
$sth{rename} = $DBH->prepare("UPDATE mailboxes SET mailbox = ? WHERE idx = ?");
my $updated = 0;
while (my ($mbx,$children) = each %$tree) {
#print $mbx, "\n";
#print_tree(0, %$children);
my $u = sync_tree(\%sth, $mbx, %$children);
$updated ||= $u;
}
if ($updated) {
# refresh the mailbox list
foreach my $name (qw/local remote/) {
@{$IMAP->{$name}}{qw/mailboxes delims/} = $IMAP->{$name}->{client}->list(q{"" "*"}, 'SUBSCRIBED');
}
my %mailboxes;
$mailboxes{$_} = 1 foreach (keys %{$IMAP->{local}->{mailboxes}}, keys %{$IMAP->{remote}->{mailboxes}});
foreach my $mbx (keys %mailboxes) {
die "Couldn't sync mailbox list.\n" if exists_mbx('local',$mbx) xor exists_mbx('remote',$mbx);
}
}
}
# Syncronize subscription list
my @SUBSCRIPTIONS;
{
my $sth_search = $DBH->prepare("SELECT idx,subscribed FROM mailboxes WHERE mailbox = ?");
my $sth_subscribe = $DBH->prepare("UPDATE mailboxes SET subscribed = ? WHERE idx = ?");
my %mailboxes;
$mailboxes{$_} = 1 foreach (keys %{$IMAP->{local}->{mailboxes}}, keys %{$IMAP->{remote}->{mailboxes}});
foreach my $mbx (keys %mailboxes) {
if (subscribed_mbx('local',$mbx) xor subscribed_mbx('remote',$mbx)) {
my ($subscribed,$unsubscribed) = subscribed_mbx('local',$mbx) ? ('local','remote') : ('remote','local');
$sth_search->execute($mbx);
my $row = $sth_search->fetch();
die if defined $sth_search->fetch(); # sanity check
if (defined $row) {
my ($idx,$status) = @$row;
if ($status) {
# $mbx was SUBSCRIBEd before, UNSUBSCRIBE it now
msg($subscribed, "Unsubscribe to mailbox $mbx");
$sth_subscribe->execute(0,$idx);
$IMAP->{$subscribed}->{client}->unsubscribe($mbx);
$DBH->commit();
$IMAP->{$subscribed}->{mailboxes}->{$mbx} =
grep {lc $_ ne lc '\Subscribed'} @{$IMAP->{$subscribed}->{mailboxes}->{$mbx} // []};
}
else {
# $mbx was UNSUBSCRIBEd before, SUBSCRIBE it now
msg($unsubscribed, "Subscribe to mailbox $mbx");
$sth_subscribe->execute(1,$idx);
$IMAP->{$unsubscribed}->{client}->subscribe($mbx);
$DBH->commit();
$IMAP->{$unsubscribed}->{mailboxes}->{$mbx} //= [];
push @{$IMAP->{$unsubscribed}->{mailboxes}->{$mbx}}, '\Subscribed';
}
}
else {
# $mbx is unknown; assume the user wants to SUBSCRIBE
msg($unsubscribed, "Subscribe to mailbox $mbx");
$IMAP->{$unsubscribed}->{client}->subscribe($mbx);
$IMAP->{$unsubscribed}->{mailboxes}->{$mbx} //= [];
push @{$IMAP->{$unsubscribed}->{mailboxes}->{$mbx}}, '\Subscribed';
}
}
else {
$sth_search->execute($mbx);
my $row = $sth_search->fetch();
die if defined $sth_search->fetch(); # sanity check
if (defined $row) {
my ($idx,$status) = @$row;
unless (defined $status and $status != 0) {
my $subscribed = subscribed_mbx('local',$mbx) ? 1 : 0;
$sth_subscribe->execute($subscribed, $idx);
$DBH->commit();
}
}
}
push @SUBSCRIPTIONS, $mbx if subscribed_mbx('local', $mbx) and
subscribed_mbx('remote',$mbx);
}
}
# Clean database: remove mailboxes that no longer exist
{
my $sth = $DBH->prepare("SELECT idx,mailbox,subscribed FROM mailboxes");
my $sth_delete_mailboxes = $DBH->prepare("DELETE FROM mailboxes WHERE idx = ?");
my $sth_delete_local = $DBH->prepare("DELETE FROM local WHERE idx = ?");
my $sth_delete_remote = $DBH->prepare("DELETE FROM remote WHERE idx = ?");
my $sth_delete_mapping = $DBH->prepare("DELETE FROM mapping WHERE idx = ?");
my @idx;
$sth->execute();
while (defined (my $row = $sth->fetch)) {
my ($idx,$mbx,$subscribed) = @$row;
if (!exists_mbx('local',$mbx) and !exists_mbx('remote',$mbx)) {
$_->execute($idx) foreach ($sth_delete_mapping,$sth_delete_local,$sth_delete_remote);
$sth_delete_mailboxes->execute($idx) if
!exists $IMAP->{local}->{mailboxes}->{$mbx} and
!exists $IMAP->{remote}->{mailboxes}->{$mbx};
$DBH->commit();
}
}
}
#############################################################################
# Synchronize messages
# Consider only the mailboxes in @ARGV, if the list is non-empty.
my ($lIMAP, $rIMAP) = map {$IMAP->{$_}->{client}} qw/local remote/;
undef $IMAP;
# Get all cached states from the database.
my $STH_GET_CACHE = $DBH->prepare(q{
SELECT mailbox,
l.UIDVALIDITY as lUIDVALIDITY, l.UIDNEXT as lUIDNEXT, l.HIGHESTMODSEQ as lHIGHESTMODSEQ,
r.UIDVALIDITY as rUIDVALIDITY, r.UIDNEXT as rUIDNEXT, r.HIGHESTMODSEQ as rHIGHESTMODSEQ
FROM mailboxes m JOIN local l ON m.idx = l.idx JOIN remote r ON m.idx = r.idx
});
my $STH_GET_CACHE_BY_IDX = $DBH->prepare(q{
SELECT mailbox,
l.UIDVALIDITY as lUIDVALIDITY, l.UIDNEXT as lUIDNEXT, l.HIGHESTMODSEQ as lHIGHESTMODSEQ,
r.UIDVALIDITY as rUIDVALIDITY, r.UIDNEXT as rUIDNEXT, r.HIGHESTMODSEQ as rHIGHESTMODSEQ
FROM mailboxes m JOIN local l ON m.idx = l.idx JOIN remote r ON m.idx = r.idx
WHERE m.idx = ?
});
# Get the index associated with a mailbox.
my $STH_GET_INDEX = $DBH->prepare(q{SELECT idx FROM mailboxes WHERE mailbox = ?});
# Find local/remote UID from the map.
my $STH_GET_LOCAL_UID = $DBH->prepare(q{SELECT lUID FROM mapping WHERE idx = ? and rUID = ?});
my $STH_GET_REMOTE_UID = $DBH->prepare(q{SELECT rUID FROM mapping WHERE idx = ? and lUID = ?});
# Delete a (idx,lUID,rUID) association.
# /!\ Don't commit before the messages have actually been EXPUNGEd on both sides!
my $STH_DELETE_MAPPING = $DBH->prepare(q{DELETE FROM mapping WHERE idx = ? and lUID = ?});
# Update the HIGHESTMODSEQ.
my $STH_UPDATE_LOCAL_HIGHESTMODSEQ = $DBH->prepare(q{UPDATE local SET HIGHESTMODSEQ = ? WHERE idx = ?});
my $STH_UPDATE_REMOTE_HIGHESTMODSEQ = $DBH->prepare(q{UPDATE remote SET HIGHESTMODSEQ = ? WHERE idx = ?});
# Update the HIGHESTMODSEQ and UIDNEXT.
my $STH_UPDATE_LOCAL = $DBH->prepare(q{UPDATE local SET UIDNEXT = ?, HIGHESTMODSEQ = ? WHERE idx = ?});
my $STH_UPDATE_REMOTE = $DBH->prepare(q{UPDATE remote SET UIDNEXT = ?, HIGHESTMODSEQ = ? WHERE idx = ?});
# Add a new mailbox.
my $STH_INSERT_MAILBOX= $DBH->prepare(q{INSERT INTO mailboxes (mailbox,subscribed) VALUES (?,?)});
my $STH_INSERT_LOCAL = $DBH->prepare(q{INSERT INTO local (idx,UIDVALIDITY,UIDNEXT,HIGHESTMODSEQ) VALUES (?,?,0,0)});
my $STH_INSERT_REMOTE = $DBH->prepare(q{INSERT INTO remote (idx,UIDVALIDITY,UIDNEXT,HIGHESTMODSEQ) VALUES (?,?,0,0)});
# Insert or retrieve a (idx,lUID,rUID) association.
my $STH_INSERT_MAPPING = $DBH->prepare(q{INSERT INTO mapping (idx,lUID,rUID) VALUES (?,?,?)});
my $STH_GET_MAPPING = $DBH->prepare(q{SELECT lUID,rUID FROM mapping WHERE idx = ?});
# Get the list of interrupted mailbox syncs.
my $STH_LIST_INTERRUPTED = $DBH->prepare(q{
SELECT mbx.idx, mailbox
FROM mailboxes mbx JOIN local l ON mbx.idx = l.idx JOIN remote r ON mbx.idx = r.idx JOIN mapping ON mbx.idx = mapping.idx
WHERE (lUID >= l.UIDNEXT OR rUID >= r.UIDNEXT)
GROUP BY mbx.idx
});
# For an interrupted mailbox sync, get the pairs (lUID,rUID) that have
# already been downloaded.
my $STH_GET_INTERRUPTED_BY_IDX = $DBH->prepare(q{
SELECT lUID, rUID
FROM mapping m JOIN local l ON m.idx = l.idx JOIN remote r ON m.idx = r.idx
WHERE m.idx = ? AND (lUID >= l.UIDNEXT OR rUID >= r.UIDNEXT)
});
# Download some missing UIDs.
sub fix_missing($$$@) {
my $idx = shift;
my $mailbox = shift;
my $name = shift;
my @set = @_;
my $source = $name eq 'local' ? $lIMAP : $rIMAP;
my $target = $name eq 'local' ? $rIMAP : $lIMAP;
my $attrs = join ' ', qw/MODSEQ FLAGS INTERNALDATE ENVELOPE BODY.PEEK[]/;
$source->fetch(compact_set(@set), "($attrs)", sub($) {
my $mail = shift;
return unless exists $mail->{RFC822}; # not for us
my $suid = $mail->{UID};
my $from = first { defined $_ and @$_ } @{$mail->{ENVELOPE}}[2,3,4];
$from = (defined $from and @$from) ? $from->[0]->[2].'@'.$from->[0]->[3] : '';
print STDERR "$name($mailbox): UID $suid from <$from> ($mail->{INTERNALDATE})\n" unless $CONFIG{quiet};
# don't bother checking for MULTIAPPEND, @set is probably rather small
my ($tuid) = $target->append($mailbox, $mail);
my ($lUID, $rUID) = $name eq 'local' ? ($suid, $tuid) : ($tuid, $suid);
print STDERR "$name($mailbox): Adding mapping (lUID,rUID) = ($lUID,$rUID)\n";
$STH_INSERT_MAPPING->execute($idx, $lUID, $rUID);
});
}
# Check synchronization of a mailbox between the two servers (in a very crude way)
my @CHECKED;
sub check($$$$$) {
my ($idx, $lVanished, $lList, $rVanished, $rList) = @_;
my %lVanished = map {$_ => 1} @$lVanished;
my %rVanished = map {$_ => 1} @$rVanished;
$STH_GET_CACHE_BY_IDX->execute($idx);
my $cache = $STH_GET_CACHE_BY_IDX->fetchrow_hashref() // die "Missing cache for index $idx";
die if defined $STH_GET_CACHE_BY_IDX->fetch(); # sanity check
my $mailbox = $cache->{mailbox};
$STH_GET_MAPPING->execute($idx);
my %missing = ( local => [], remote => [] );
while (defined (my $row = $STH_GET_MAPPING->fetch())) {
my ($lUID, $rUID) = @$row;
if (defined $lList->{$lUID} and defined $rList->{$rUID}) {
# both $lUID and $rUID are known
if ($lList->{$lUID}->[0] <= $cache->{lHIGHESTMODSEQ} and
$rList->{$rUID}->[0] <= $cache->{rHIGHESTMODSEQ}) {
# old stuff
if ($lList->{$lUID}->[1] ne $rList->{$rUID}->[1]) {
warn "WARNING: Missed flag update in $mailbox for (lUID,rUID) = ($lUID,$rUID). Fixing...\n";
# keep it in the hash references so we fix it automatically
}
else {
# no conflict, remove it from the hashes
delete $lList->{$lUID};
delete $rList->{$rUID};
}
}
else {
# delete the old stuff
delete $lList->{$lUID} if $lList->{$lUID}->[0] <= $cache->{lHIGHESTMODSEQ};
delete $rList->{$rUID} if $rList->{$rUID}->[0] <= $cache->{rHIGHESTMODSEQ};
}
}
elsif (!defined $lList->{$lUID} and !defined $rList->{$rUID}) {
unless ($lVanished{$lUID} and $rVanished{$rUID}) {
# will be deleted from the database later
warn "WARNING: Pair (lUID,rUID) = ($lUID,$rUID) vanished from $mailbox\n";
$lVanished{$lUID} = 1;
$rVanished{$rUID} = 1;
}
}
elsif (!defined $lList->{$lUID}) {
unless ($lVanished{$lUID}) {
warn "local($mailbox): WARNING: No match for remote UID $rUID. Downloading again...\n";
push @{$missing{remote}}, $rUID;
delete $rList->{$rUID};
}
}
elsif (!defined $rList->{$rUID}) {
unless ($rVanished{$rUID}) {
warn "remote($mailbox): WARNING: No match for local UID $lUID. Downloading again...\n";
push @{$missing{local}}, $lUID;
delete $lList->{$lUID};
}
}
$lList->{$lUID} = $lList->{$lUID}->[1] if defined $lList->{$lUID};
$rList->{$rUID} = $rList->{$rUID}->[1] if defined $rList->{$rUID};
}
# we'll complain later for modified UIDs without an entry in the database
@$lVanished = keys %lVanished;
@$rVanished = keys %rVanished;
push @CHECKED, $idx;
return %missing;
}
# Sync known messages. Since pull_updates is the last method call on
# $lIMAP and $rIMAP, it is safe to call get_cache on either object after
# this function, in order to update the HIGHESTMODSEQ.
# Return true if an update was detected, and false otherwise
sub sync_known_messages($$) {
my ($idx, $mailbox) = @_;
my $update = 0;
# loop since processing might produce VANISHED or unsollicited FETCH responses
while (1) {
my ($lVanished, $lModified, $rVanished, $rModified, %missing);
my $check = ($CONFIG{check} and !grep { $idx == $_} @CHECKED) ? 1 : 0;
($lVanished, $lModified) = $lIMAP->pull_updates($check);
($rVanished, $rModified) = $rIMAP->pull_updates($check);
%missing = check($idx, $lVanished, $lModified, $rVanished, $rModified) if $check;
# repeat until we have nothing pending
return $update unless %$lModified or %$rModified or @$lVanished or @$rVanished or %missing;
$update = 1;
# process VANISHED messages
# /!\ this might modify the VANISHED or MODIFIED cache!
if (@$lVanished or @$rVanished) {
my %lVanished = map {$_ => 1} @$lVanished;
my %rVanished = map {$_ => 1} @$rVanished;
# For each vanished UID, get the corresponding one on the
# other side (from the DB); consider it as to be removed if
# it hasn't been removed already.
my (@lToRemove, @rToRemove);
foreach my $lUID (@$lVanished) {
$STH_GET_REMOTE_UID->execute($idx, $lUID);
my ($rUID) = $STH_GET_REMOTE_UID->fetchrow_array();
die if defined $STH_GET_REMOTE_UID->fetchrow_arrayref(); # sanity check
if (!defined $rUID) {
warn "remote($mailbox): WARNING: No match for local vanished UID $lUID. Ignoring...\n";
}
elsif (!exists $rVanished{$rUID}) {
push @rToRemove, $rUID;
}
}
foreach my $rUID (@$rVanished) {
$STH_GET_LOCAL_UID->execute($idx, $rUID);
my ($lUID) = $STH_GET_LOCAL_UID->fetchrow_array();
die if defined $STH_GET_LOCAL_UID->fetchrow_arrayref(); # sanity check
if (!defined $lUID) {
warn "local($mailbox): WARNING: No match for remote vanished UID $rUID. Ignoring...\n";
}
elsif (!exists $lVanished{$lUID}) {
push @lToRemove, $lUID;
}
}
$lIMAP->remove_message(@lToRemove) if @lToRemove;
$rIMAP->remove_message(@rToRemove) if @rToRemove;
# remove existing mappings
foreach my $lUID (@$lVanished, @lToRemove) {
my $r = $STH_DELETE_MAPPING->execute($idx, $lUID);
die if $r > 1; # sanity check
warn "WARNING: Can't delete (idx,lUID) = ($idx,$lUID) from the database\n" if $r == 0;
}
}
# process FLAG updates
# /!\ this might modify the VANISHED or MODIFIED cache!
if (%$lModified or %$rModified) {
my (%lToUpdate, %rToUpdate);
# Take flags updates on both sides, and get the
# corresponding UIDs on the other side (from the DB).
# If it wasn't modified there, make it such; if it was
# modified with the same flags list, ignore that message;
# otherwise there is a conflict, and take the union.
#
# Group by flags in order to limit the number of round
# trips.
while (my ($lUID,$lFlags) = each %$lModified) {
$STH_GET_REMOTE_UID->execute($idx, $lUID);
my ($rUID) = $STH_GET_REMOTE_UID->fetchrow_array();
die if defined $STH_GET_REMOTE_UID->fetchrow_arrayref(); # sanity check
if (!defined $rUID) {
warn "remote($mailbox): WARNING: No match for local updated UID $lUID. Downloading again...\n";
push @{$missing{local}}, $lUID;
}
elsif (defined (my $rFlags = $rModified->{$rUID})) {
unless ($lFlags eq $rFlags) {
my %flags = map {$_ => 1} (split(/ /, $lFlags), split(/ /, $rFlags));
my $flags = join ' ', sort(keys %flags);
warn "WARNING: Conflicting flag update in $mailbox for local UID $lUID ($lFlags) ".
"and remote UID $rUID ($rFlags). Setting both to the union ($flags).\n";
$lToUpdate{$flags} //= [];
push @{$lToUpdate{$flags}}, $lUID;
$rToUpdate{$flags} //= [];
push @{$rToUpdate{$flags}}, $rUID;
}
}
else {
$rToUpdate{$lFlags} //= [];
push @{$rToUpdate{$lFlags}}, $rUID;
}
}
while (my ($rUID,$rFlags) = each %$rModified) {
$STH_GET_LOCAL_UID->execute($idx, $rUID);
my ($lUID) = $STH_GET_LOCAL_UID->fetchrow_array();
die if defined $STH_GET_LOCAL_UID->fetchrow_arrayref(); # sanity check
if (!defined $lUID) {
warn "local($mailbox): WARNING: No match for remote updated UID $rUID. Downloading again...\n";
push @{$missing{remote}}, $rUID;
}
elsif (!exists $lModified->{$lUID}) {
# conflicts are taken care of above
$lToUpdate{$rFlags} //= [];
push @{$lToUpdate{$rFlags}}, $lUID;
}
}
fix_missing($idx, $mailbox, 'local', @{$missing{local}}) if @{$missing{local} // []};
fix_missing($idx, $mailbox, 'remote', @{$missing{remote}}) if @{$missing{remote} // []};
while (my ($lFlags,$lUIDs) = each %lToUpdate) {
$lIMAP->push_flag_updates($lFlags, @$lUIDs);
}
while (my ($rFlags,$rUIDs) = each %rToUpdate) {
$rIMAP->push_flag_updates($rFlags, @$rUIDs);
}
}
}
}
# The callback to use when FETCHing new messages from $name to add it to
# the other one.
# If defined, the array reference $UIDs will be fed with the newly added
# UIDs.
# If defined, $buff contains the list of messages to be appended with
# MULTIAPPEND. In that case callback_new_message_flush should be called
# after the FETCH.
sub callback_new_message($$$$;$$$) {
my ($idx, $mailbox, $name, $mail, $UIDs, $buff, $bufflen) = @_;
return unless exists $mail->{RFC822}; # not for us
my $length = length $mail->{RFC822};
if ($length == 0) {
warn "$name($mailbox): WARNING: Ignoring new 0-length message (UID $mail->{UID})\n";
return;
}
my @UIDs;
unless (defined $buff) {
@UIDs = callback_new_message_flush($idx, $mailbox, $name, $mail);
}
else {
# use MULTIAPPEND (RFC 3502)
# proceed by batches of 1MB to save roundtrips without blowing up the memory
if (@$buff and $$bufflen + $length > 1048576) {
@UIDs = callback_new_message_flush($idx, $mailbox, $name, @$buff);
@$buff = ();
$$bufflen = 0;
}
push @$buff, $mail;
$$bufflen += $length;
}
push @$UIDs, @UIDs if defined $UIDs;
}
# Add the given @messages (multiple messages are only allowed for
# MULTIAPPEND-capable servers) from $name to the other server.
# Returns the list of newly allocated UIDs.
sub callback_new_message_flush($$$@) {
my ($idx, $mailbox, $name, @messages) = @_;
my $imap = $name eq 'local' ? $rIMAP : $lIMAP; # target client
my @sUID = map {$_->{UID}} @messages;
my @tUID = $imap->append($mailbox, @messages);
die unless $#sUID == $#tUID; # sanity check
my ($lUIDs, $rUIDs) = $name eq 'local' ? (\@sUID,\@tUID) : (\@tUID,\@sUID);
for (my $k=0; $k<=$#messages; $k++) {
print STDERR "Adding mapping (lUID,rUID) = ($lUIDs->[$k],$rUIDs->[$k]) for $mailbox\n"
if $CONFIG{debug};
$STH_INSERT_MAPPING->execute($idx, $lUIDs->[$k], $rUIDs->[$k]);
}
$DBH->commit(); # commit only once per batch
return @tUID;
}
# Sync both known and new messages
# If the array references $lIgnore and $rIgnore are not empty, skip
# the given UIDs.
sub sync_messages($$;$$) {
my ($idx, $mailbox, $lIgnore, $rIgnore) = @_;
my ($buff, $bufflen, @lUIDs);
# get new messages from remote (except @$rIgnore) and APPEND them to local
($buff, $bufflen) = ([], 0);
undef $buff if $lIMAP->incapable('MULTIAPPEND');
$rIMAP->pull_new_messages(sub($) {
callback_new_message($idx, $mailbox, 'remote', shift, \@lUIDs, $buff, \$bufflen)
}, @{$rIgnore // []});
push @lUIDs, callback_new_message_flush($idx, $mailbox, 'remote', @$buff)
if defined $buff and @$buff;
# get new messages from local (except @$lIgnore and the newly allocated local
# UIDs @lUIDs) and APPEND them to remote
($buff, $bufflen) = ([], 0);
undef $buff if $rIMAP->incapable('MULTIAPPEND');
$lIMAP->pull_new_messages(sub($) {
callback_new_message($idx, $mailbox, 'local', shift, undef, $buff, \$bufflen)
}, @{$lIgnore // []}, @lUIDs);
callback_new_message_flush($idx, $mailbox, 'local', @$buff)
if defined $buff and @$buff;
# both local and remote UIDNEXT are now up to date; proceed with
# pending flag updates and vanished messages
sync_known_messages($idx, $mailbox);
# don't store the new UIDNEXTs before to avoid downloading these
# mails again in the event of a crash
$STH_UPDATE_LOCAL->execute($lIMAP->get_cache( qw/UIDNEXT HIGHESTMODSEQ/), $idx);
$STH_UPDATE_REMOTE->execute($rIMAP->get_cache(qw/UIDNEXT HIGHESTMODSEQ/), $idx);
$DBH->commit();
}
# Wait up to $timout seconds for notifications on either IMAP server.
# Then issue a NOOP so the connection doesn't terminate for inactivity.
sub wait_notifications(;$) {
my $timeout = shift // 300;
while ($timeout > 0) {
my $r1 = $lIMAP->slurp();
my $r2 = $rIMAP->slurp();
last if $r1 or $r2; # got update!
sleep 1;
if (--$timeout == 0) {
$lIMAP->noop();
$rIMAP->noop();
# might have got updates so exit the loop
}
}
}
# Resume interrupted mailbox syncs.
my ($MAILBOX, $IDX);
$STH_LIST_INTERRUPTED->execute();
while (defined (my $row = $STH_LIST_INTERRUPTED->fetchrow_arrayref())) {
($IDX, $MAILBOX) = @$row;
print STDERR "Resuming interrupted sync for $MAILBOX\n";
my %lUIDs;
$STH_GET_INTERRUPTED_BY_IDX->execute($IDX);
while (defined (my $row = $STH_GET_INTERRUPTED_BY_IDX->fetchrow_arrayref())) {
$lUIDs{$row->[0]} = $row->[1]; # pair ($lUID, $rUID)
}
die unless %lUIDs; # sanity check
$lIMAP->select($MAILBOX);
$rIMAP->select($MAILBOX);
# FETCH all messages with their FLAGS to detect messages that have
# vanished meanwhile, or for which there was a flag update.
my (%lList, %rList); # The lists of existing local and remote UIDs
my $attrs = '('.join(' ', qw/MODSEQ FLAGS/).')';
$lIMAP->fetch(compact_set(keys %lUIDs), $attrs, sub($){ $lList{shift->{UID}} = 1 });
$rIMAP->fetch(compact_set(values %lUIDs), $attrs, sub($){ $rList{shift->{UID}} = 1 });
my (@lToRemove, @rToRemove);
while (my ($lUID,$rUID) = each %lUIDs) {
next if $lList{$lUID} and $rList{$rUID}; # exists on both
push @lToRemove, $lUID if $lList{$lUID};
push @rToRemove, $rUID if $rList{$rUID};
my $r = $STH_DELETE_MAPPING->execute($IDX, $lUID);
die if $r > 1; # sanity check
warn "WARNING: Can't delete (idx,lUID) = ($IDX,$lUID) from the database\n" if $r == 0;
}
$lIMAP->remove_message(@lToRemove) if @lToRemove;
$rIMAP->remove_message(@rToRemove) if @rToRemove;
$DBH->commit() if @lToRemove or @rToRemove; # /!\ commit *after* remove_message!
# ignore deleted messages
delete @lList{@lToRemove};
delete @rList{@rToRemove};
# Resume the sync, but skip messages that have already been
# downloaded. Flag updates will be processed automatically since
# the _MODIFIED internal cache has been initialized with all our
# UIDs. (Since there is no reliable HIGHESTMODSEQ, any flag
# difference is treated as a conflict.)
sync_messages($IDX, $MAILBOX, [keys %lList], [keys %rList]);
}
# Initialize $lIMAP and $rIMAP states to detect mailbox dirtyness.
$STH_GET_CACHE->execute();
while (defined (my $row = $STH_GET_CACHE->fetchrow_hashref())) {
$lIMAP->set_cache($row->{mailbox},
UIDVALIDITY => $row->{lUIDVALIDITY},
UIDNEXT => $row->{lUIDNEXT},
HIGHESTMODSEQ => ($CONFIG{check} ? 0 : $row->{lHIGHESTMODSEQ})
);
$rIMAP->set_cache($row->{mailbox},
UIDVALIDITY => $row->{rUIDVALIDITY},
UIDNEXT => $row->{rUIDNEXT},
HIGHESTMODSEQ => ($CONFIG{check} ? 0 : $row->{rHIGHESTMODSEQ})
);
}
while(1) {
while(1) {
my $cache;
my $update = 0;
if (defined $MAILBOX and ($lIMAP->is_dirty($MAILBOX) or $rIMAP->is_dirty($MAILBOX))) {
# $MAILBOX is dirty on either the local or remote mailbox
sync_messages($IDX, $MAILBOX);
}
else {
$MAILBOX = $lIMAP->next_dirty_mailbox(@ARGV) // $rIMAP->next_dirty_mailbox(@ARGV) // last;
$MAILBOX = 'INBOX' if uc $MAILBOX eq 'INBOX'; # INBOX is case insensitive
$STH_GET_INDEX->execute($MAILBOX);
($IDX) = $STH_GET_INDEX->fetchrow_array();
die if defined $STH_GET_INDEX->fetch(); # sanity check
$lIMAP->select($MAILBOX);
$rIMAP->select($MAILBOX);
# new mailbox
if (!defined $IDX) {
my $subscribed = (grep { $_ eq $MAILBOX} @SUBSCRIPTIONS) ? 1 : 0;
$STH_INSERT_MAILBOX->execute($MAILBOX, $subscribed);
$STH_GET_INDEX->execute($MAILBOX);
($IDX) = $STH_GET_INDEX->fetchrow_array();
die if !defined $IDX or defined $STH_GET_INDEX->fetchrow_arrayref(); # sanity check
$STH_INSERT_LOCAL->execute( $IDX, $lIMAP->uidvalidity($MAILBOX));
$STH_INSERT_REMOTE->execute($IDX, $rIMAP->uidvalidity($MAILBOX));
# don't commit before the first mapping (lUID,rUID)
}
elsif (sync_known_messages($IDX, $MAILBOX)) {
# sync updates to known messages before fetching new messages
# get_cache is safe after pull_update
$STH_UPDATE_LOCAL_HIGHESTMODSEQ->execute( $lIMAP->get_cache('HIGHESTMODSEQ'), $IDX);
$STH_UPDATE_REMOTE_HIGHESTMODSEQ->execute($rIMAP->get_cache('HIGHESTMODSEQ'), $IDX);
$DBH->commit();
}
sync_messages($IDX, $MAILBOX);
}
}
# clean state!
if ($CONFIG{oneshot} or $CONFIG{check}) {
cleanup();
exit 0;
}
wait_notifications(900);
}
END { cleanup(); }
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