path: root/IkiWiki/Plugin/openid.pm

#!/usr/bin/perl
# OpenID support.
package IkiWiki::Plugin::openid;

use warnings;
use strict;
use IkiWiki 3.00;

sub import {
    add_underlay("openid-selector");
    hook(type => "checkconfig", id => "openid", call => \&checkconfig);
    hook(type => "getsetup", id => "openid", call => \&getsetup);
    hook(type => "auth", id => "openid", call => \&auth);
    hook(type => "formbuilder_setup", id => "openid",
        call => \&formbuilder_setup, last => 1);
}

sub checkconfig () {
    if ($config{cgi}) {
        # Intercept normal signin form, so the openid selector
        # can be displayed.
        # 
        # When other auth hooks are registered, give the selector
        # a reference to the normal signin form.
        require IkiWiki::CGI;
        my $real_cgi_signin;
        if (keys %{$IkiWiki::hooks{auth}} > 1) {
            $real_cgi_signin=\&IkiWiki::cgi_signin;
        }
        inject(name => "IkiWiki::cgi_signin", call => sub ($$) {
            openid_selector($real_cgi_signin, @_);
        });
    }
}

sub getsetup () {
    return
        plugin => {
            safe => 1,
            rebuild => 0,
            section => "auth",
        },
        openid_realm => {
            type => "string",
            description => "url pattern of openid realm (default is cgiurl)",
            safe => 0,
            rebuild => 0,
        },
        openid_cgiurl => {
            type => "string",
            description => "url to ikiwiki cgi to use for openid authentication (default is cgiurl)",
            safe => 0,
            rebuild => 0,
        },
}

sub openid_selector {
    my $real_cgi_signin=shift;
        my $q=shift;
        my $session=shift;

    my $openid_url=$q->param('openid_identifier');
    my $openid_error;

    if (! load_openid_module()) {
        if ($real_cgi_signin) {
            $real_cgi_signin->($q, $session);
            exit;
        }
        error(sprintf(gettext("failed to load openid module: "), @_));
    }
    elsif (defined $q->param("action") && $q->param("action") eq "verify") {
        validate($q, $session, $openid_url, sub {
            $openid_error=shift;
        });
    }

    my $template=IkiWiki::template("openid-selector.tmpl");
    $template->param(
        cgiurl => IkiWiki::cgiurl(),
        (defined $openid_error ? (openid_error => $openid_error) : ()),
        (defined $openid_url ? (openid_url => $openid_url) : ()),
        ($real_cgi_signin ? (nonopenidform => $real_cgi_signin->($q, $session, 1)) : ()),
    );

    IkiWiki::printheader($session);
    print IkiWiki::misctemplate("signin", $template->output);
    exit;
}

sub formbuilder_setup (@) {
    my %params=@_;

    my $form=$params{form};
    my $session=$params{session};
    my $cgi=$params{cgi};
    
    if ($form->title eq "preferences" &&
           IkiWiki::openiduser($session->param("name"))) {
        $form->field(name => "openid_identifier", disabled => 1,
            label => htmllink("", "", "ikiwiki/OpenID", noimageinline => 1),
            value => $session->param("name"), 
            size => length($session->param("name")), force => 1,
            fieldset => "login");
        $form->field(name => "email", type => "hidden");
    }
}

sub validate ($$$;$) {
    my $q=shift;
    my $session=shift;
    my $openid_url=shift;
    my $errhandler=shift;

    my $csr=getobj($q, $session);

    my $claimed_identity = $csr->claimed_identity($openid_url);
    if (! $claimed_identity) {
        if ($errhandler) {
            $errhandler->($csr->err);
            return 0;
        }
        else {
            error($csr->err);
        }
    }

    # Ask for client to provide a name and email, if possible.
    # Try sreg and ax
    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 $cgiurl=$config{openid_cgiurl};
    $cgiurl=$q->url if ! defined $cgiurl;

    my $trust_root=$config{openid_realm};
    $trust_root=$cgiurl if ! defined $trust_root;

    my $check_url = $claimed_identity->check_url(
        return_to => "$cgiurl?do=postsignin",
        trust_root => $trust_root,
        delayed_return => 1,
    );
    # Redirect the user to the OpenID server, which will
    # eventually bounce them back to auth()
    IkiWiki::redirect($q, $check_url);
    exit 0;
}

sub auth ($$) {
    my $q=shift;
    my $session=shift;

    if (defined $q->param('openid.mode')) {
        my $csr=getobj($q, $session);

        if (my $setup_url = $csr->user_setup_url) {
            IkiWiki::redirect($q, $setup_url);
        }
        elsif ($csr->user_cancel) {
            IkiWiki::redirect($q, IkiWiki::baseurl(undef));
        }
        elsif (my $vident = $csr->verified_identity) {
            $session->param(name => $vident->url);

            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'),
                );
            }
            my $nickname;
            foreach my $ext (@extensions) {
                foreach my $field (qw{value.email email}) {
                    if (exists $ext->{$field} &&
                        defined $ext->{$field} &&
                        length $ext->{$field}) {
                        $session->param(email => $ext->{$field});
                        if (! defined $nickname &&
                            $ext->{$field}=~/(.+)@.+/) {
                            $nickname = $1;
                        }
                        last;
                    }
                }
                foreach my $field (qw{value.nickname nickname value.fullname fullname value.firstname}) {
                    if (exists $ext->{$field} &&
                        defined $ext->{$field} &&
                        length $ext->{$field}) {
                        $nickname=$ext->{$field};
                        last;
                    }
                }
            }
            if (defined $nickname) {
                $session->param(nickname =>
                    Encode::decode_utf8($nickname));
            }
        }
        else {
            error("OpenID failure: ".$csr->err);
        }
    }
    elsif (defined $q->param('openid_identifier')) {
        # myopenid.com affiliate support
        validate($q, $session, $q->param('openid_identifier'));
    }
}

sub getobj ($$) {
    my $q=shift;
    my $session=shift;

    eval q{use Net::OpenID::Consumer};
    error($@) if $@;

    my $ua;
    eval q{use LWPx::ParanoidAgent};
    if (! $@) {
        $ua=LWPx::ParanoidAgent->new;
    }
    else {
            $ua=LWP::UserAgent->new;
    }

    # Store the secret in the session.
    my $secret=$session->param("openid_secret");
    if (! defined $secret) {
        $secret=rand;
        $session->param(openid_secret => $secret);
    }
    
    my $cgiurl=$config{openid_cgiurl};
    $cgiurl=$q->url if ! defined $cgiurl;

    return Net::OpenID::Consumer->new(
        ua => $ua,
        args => $q,
        consumer_secret => sub { return shift()+$secret },
        required_root => $cgiurl,
    );
}

sub load_openid_module {
    # Give up if module is unavailable to avoid needing to depend on it.
    eval q{use Net::OpenID::Consumer};
    if ($@) {
        debug("unable to load Net::OpenID::Consumer, not enabling OpenID login ($@)");
        return;
    }
    return 1;
}

1