httpauth: When it's the only auth method, avoid a pointless and confusing signin form, and just right to the httpauthurl.

IkiWiki/Plugin/httpauth.pm

@@ -7,6 +7,7 @@ use strict;
 use IkiWiki 3.00;
 
 sub import {
+	hook(type => "checkconfig", id => "httpauth", call => \&checkconfig);
 	hook(type => "getsetup", id => "httpauth", call => \&getsetup);
 	hook(type => "auth", id => "httpauth", call => \&auth);
 	hook(type => "formbuilder_setup", id => "httpauth",
@@ -37,6 +38,19 @@ sub getsetup () {
 			rebuild => 0,
 		},
 }
+
+sub checkconfig () {
+	if ($config{cgi} && defined $config{cgiauthurl} &&
+	    keys %{$IkiWiki::hooks{auth}} < 2) {
+		# There are no other auth hooks registered, so avoid
+		# the normal signin form, and jump right to httpauth.
+		require IkiWiki::CGI;
+		inject(name => "IkiWiki::cgi_signin", call => sub ($$) {
+			my $cgi=shift;
+			redir_cgiauthurl($cgi, $cgi->query_string());
+		});
+	}
+}
 			
 sub redir_cgiauthurl ($;@) {
 	my $cgi=shift;

debian/changelog

@@ -12,6 +12,8 @@ ikiwiki (3.20120204) UNRELEASED; urgency=low
   * meta: Support keywords header. Closes: #664780
     Thanks, Martin Michlmayr
   * passwordauth: Fix url in password recovery email to be absolute.
+  * httpauth: When it's the only auth method, avoid a pointless and
+    confusing signin form, and just right to the httpauthurl.
 
  -- Joey Hess <joeyh@debian.org>  Wed, 21 Mar 2012 14:33:14 -0400