fix back-compat with old Net::OpenID

Debian stable's Net::OpenID does not support getting extension fields.

diff --git a/IkiWiki/Plugin/openid.pm b/IkiWiki/Plugin/openid.pm
index 9355cd85ad1cc27178b9c993d0f6d2a0245d36bf..7b1a17831f9155ea7034a528198ee864bb5cf6e4 100644 (file)
--- a/IkiWiki/Plugin/openid.pm
+++ b/IkiWiki/Plugin/openid.pm
@@ -116,23 +116,25 @@ sub validate ($$$;$) {
 
        # Ask for client to provide a name and email, if possible.
        # Try sreg and ax
-       $claimed_identity->set_extension_args(
-               'http://openid.net/extensions/sreg/1.1',
-               {
-                       optional => 'email,fullname,nickname',
-               },
-       );
-       $claimed_identity->set_extension_args(
-               'http://openid.net/srv/ax/1.0',
-               {
-                       mode => 'fetch_request',
-                       'required' => 'email,fullname,nickname,firstname',
-                       'type.email' => "http://schema.openid.net/contact/email",
-                       'type.fullname' => "http://axschema.org/namePerson",
-                       'type.nickname' => "http://axschema.org/namePerson/friendly",
-                       'type.firstname' => "http://axschema.org/namePerson/first",
-               },
-       );
+       if ($claimed_identity->can("set_extension_args")) {
+               $claimed_identity->set_extension_args(
+                       'http://openid.net/extensions/sreg/1.1',
+                       {
+                               optional => 'email,fullname,nickname',
+                       },
+               );
+               $claimed_identity->set_extension_args(
+                       'http://openid.net/srv/ax/1.0',
+                       {
+                               mode => 'fetch_request',
+                               'required' => 'email,fullname,nickname,firstname',
+                               'type.email' => "http://schema.openid.net/contact/email",
+                               'type.fullname' => "http://axschema.org/namePerson",
+                               'type.nickname' => "http://axschema.org/namePerson/friendly",
+                               'type.firstname' => "http://axschema.org/namePerson/first",
+                       },
+               );
+       }
 
        my $check_url = $claimed_identity->check_url(
                return_to => IkiWiki::cgiurl(do => "postsignin"),
@@ -161,10 +163,13 @@ sub auth ($$) {
                elsif (my $vident = $csr->verified_identity) {
                        $session->param(name => $vident->url);
 
-                       my @extensions=grep { defined } (
-                               $vident->signed_extension_fields('http://openid.net/extensions/sreg/1.1'),
-                               $vident->signed_extension_fields('http://openid.net/srv/ax/1.0'),
-                       );
+                       my @extensions;
+                       if ($vident->can("signed_extension_fields")) {
+                               @extensions=grep { defined } (
+                                       $vident->signed_extension_fields('http://openid.net/extensions/sreg/1.1'),
+                                       $vident->signed_extension_fields('http://openid.net/srv/ax/1.0'),
+                               );
+                       }
                        foreach my $ext (@extensions) {
                                foreach my $field (qw{value.email email}) {
                                        if (exists $ext->{$field} &&