editpage: added a cansave hook

Signed-off-by: intrigeri <intrigeri@boum.org>

IkiWiki/Plugin/editpage.pm

@@ -81,6 +81,33 @@ sub check_canedit ($$$;$) {
 	return $canedit;
 }
 
+sub check_cansave ($$$$) {
+	my $page=shift;
+	my $content=shift;
+	my $q=shift;
+	my $session=shift;
+
+	my $cansave;
+	run_hooks(cansave => sub {
+		return if defined $cansave;
+		my $ret=shift->($page, $content, $q, $session);
+		if (defined $ret) {
+			if ($ret eq "") {
+				$cansave=1;
+			}
+			elsif (ref $ret eq 'CODE') {
+				$ret->();
+				$cansave=0;
+			}
+			else {
+				error($ret);
+				$cansave=0;
+			}
+		}
+	});
+	return $cansave;
+}
+
 sub cgi_editpage ($$) {
 	my $q=shift;
 	my $session=shift;
@@ -370,6 +397,7 @@ sub cgi_editpage ($$) {
 		}
 		
 		my $content=$form->field('editcontent');
+		check_cansave($page, $content, $q, $session);
 		run_hooks(editcontent => sub {
 			$content=shift->(
 				content => $content,

IkiWiki/Plugin/skeleton.pm.example

@@ -30,6 +30,7 @@ sub import {
 	hook(type => "auth", id => "skeleton", call => \&auth);
 	hook(type => "sessioncgi", id => "skeleton", call => \&sessioncgi);
 	hook(type => "canedit", id => "skeleton", call => \&canedit);
+	hook(type => "cansave", id => "skeleton", call => \&cansave);
 	hook(type => "editcontent", id => "skeleton", call => \&editcontent);
 	hook(type => "formbuilder_setup", id => "skeleton", call => \&formbuilder_setup);
 	hook(type => "formbuilder", id => "skeleton", call => \&formbuilder);
@@ -180,6 +181,15 @@ sub canedit ($$$) {
 	debug("skeleton plugin running in canedit");
 }
 
+sub cansave ($$$$) {
+	my $page=shift;
+	my $content=shift;
+	my $cgi=shift;
+	my $session=shift;
+
+	debug("skeleton plugin running in cansave")
+}
+
 sub editcontent ($$$) {
 	my %params=@_;
 

doc/plugins/write.mdwn

@@ -321,6 +321,21 @@ This hook should avoid directly redirecting the user to a signin page,
 since it's sometimes used to test to see which pages in a set of pages a
 user can edit.
 
+### cansave
+
+	hook(type => "cansave", id => "foo", call => \&cansave);
+
+This hook can be used to implement arbitrary access methods to control
+when a page being edited can be saved using the web interface (commits
+from revision control bypass it).
+
+When a page is about to be saved, each registered cansave hook is
+called in turn, and passed the page name, the edited content, a CGI
+object and a session object.
+
+The return value of a cansave hook is interpreted the same as for the
+canedit hook.
+
 ### canremove
 
 	hook(type => "canremove", id => "foo", call => \&canremove);