+sub check_content (@) {
+ my %params=@_;
+
+ return 1 if ! exists $hooks{checkcontent}; # optimisation
+
+ if (exists $pagesources{$params{page}}) {
+ my @diff;
+ my %old=map { $_ => 1 }
+ split("\n", readfile(srcfile($pagesources{$params{page}})));
+ foreach my $line (split("\n", $params{content})) {
+ push @diff, $line if ! exists $old{$line};
+ }
+ $params{diff}=join("\n", @diff);
+ }
+
+ my $ok;
+ run_hooks(checkcontent => sub {
+ return if defined $ok;
+ my $ret=shift->(%params);
+ if (defined $ret) {
+ if ($ret eq "") {
+ $ok=1;
+ }
+ elsif (ref $ret eq 'CODE') {
+ $ret->() unless $params{nonfatal};
+ $ok=0;
+ }
+ elsif (defined $ret) {
+ error($ret) unless $params{nonfatal};
+ $ok=0;
+ }
+ }
+
+ });
+ return defined $ok ? $ok : 1;
+}
+
+sub check_canchange (@) {
+ my %params = @_;
+ my $cgi = $params{cgi};
+ my $session = $params{session};
+ my @changes = @{$params{changes}};
+
+ my %newfiles;
+ foreach my $change (@changes) {
+ # This untaint is safe because we check file_pruned and
+ # wiki_file_regexp.
+ my ($file)=$change->{file}=~/$config{wiki_file_regexp}/;
+ $file=possibly_foolish_untaint($file);
+ if (! defined $file || ! length $file ||
+ file_pruned($file)) {
+ error(gettext("bad file name %s"), $file);
+ }
+
+ my $type=pagetype($file);
+ my $page=pagename($file) if defined $type;
+
+ if ($change->{action} eq 'add') {
+ $newfiles{$file}=1;
+ }
+
+ if ($change->{action} eq 'change' ||
+ $change->{action} eq 'add') {
+ if (defined $page) {
+ check_canedit($page, $cgi, $session);
+ next;
+ }
+ else {
+ if (IkiWiki::Plugin::attachment->can("check_canattach")) {
+ IkiWiki::Plugin::attachment::check_canattach($session, $file, $change->{path});
+ check_canedit($file, $cgi, $session);
+ next;
+ }
+ }
+ }
+ elsif ($change->{action} eq 'remove') {
+ # check_canremove tests to see if the file is present
+ # on disk. This will fail when a single commit adds a
+ # file and then removes it again. Avoid the problem
+ # by not testing the removal in such pairs of changes.
+ # (The add is still tested, just to make sure that
+ # no data is added to the repo that a web edit
+ # could not add.)
+ next if $newfiles{$file};
+
+ if (IkiWiki::Plugin::remove->can("check_canremove")) {
+ IkiWiki::Plugin::remove::check_canremove(defined $page ? $page : $file, $cgi, $session);
+ check_canedit(defined $page ? $page : $file, $cgi, $session);
+ next;
+ }
+ }
+ else {
+ error "unknown action ".$change->{action};
+ }
+
+ error sprintf(gettext("you are not allowed to change %s"), $file);
+ }
+}
+
+
+my $wikilock;
+
+sub lockwiki () {
+ # Take an exclusive lock on the wiki to prevent multiple concurrent