ikiwiki/IkiWiki/CGI.pm

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#!/usr/bin/perl
package IkiWiki;
use warnings;
use strict;
use IkiWiki;
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use IkiWiki::UserInfo;
use open qw{:utf8 :std};
use Encode;
sub printheader ($) {
my $session=shift;
if ($config{sslcookie}) {
print $session->header(-charset => 'utf-8',
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-cookie => $session->cookie(-httponly => 1, -secure => 1));
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}
else {
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print $session->header(-charset => 'utf-8',
-cookie => $session->cookie(-httponly => 1));
}
}
sub prepform {
my $form=shift;
my $buttons=shift;
my $session=shift;
my $cgi=shift;
if (exists $hooks{formbuilder}) {
run_hooks(formbuilder => sub {
shift->(form => $form, cgi => $cgi, session => $session,
buttons => $buttons);
});
}
return $form;
}
sub showform ($$$$;@) {
my $form=prepform(@_);
shift;
my $buttons=shift;
my $session=shift;
my $cgi=shift;
printheader($session);
print misctemplate($form->title, $form->render(submit => $buttons), @_);
}
sub redirect ($$) {
my $q=shift;
eval q{use URI};
my $url=URI->new(shift);
if (! $config{w3mmode}) {
print $q->redirect($url);
}
else {
print "Content-type: text/plain\n";
print "W3m-control: GOTO $url\n\n";
}
}
sub decode_cgi_utf8 ($) {
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# decode_form_utf8 method is needed for 5.01
if ($] < 5.01) {
my $cgi = shift;
foreach my $f ($cgi->param) {
$cgi->param($f, map { decode_utf8 $_ } $cgi->param($f));
}
}
}
sub decode_form_utf8 ($) {
if ($] >= 5.01) {
my $form = shift;
foreach my $f ($form->field) {
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my @value=map { decode_utf8($_) } $form->field($f);
$form->field(name => $f,
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value => \@value,
force => 1,
);
}
}
}
# Check if the user is signed in. If not, redirect to the signin form and
# save their place to return to later.
sub needsignin ($$) {
my $q=shift;
my $session=shift;
if (! defined $session->param("name") ||
! userinfo_get($session->param("name"), "regdate")) {
$session->param(postsignin => $ENV{QUERY_STRING});
cgi_signin($q, $session);
cgi_savesession($session);
exit;
}
}
sub cgi_signin ($$;$) {
my $q=shift;
my $session=shift;
my $returnhtml=shift;
decode_cgi_utf8($q);
eval q{use CGI::FormBuilder};
error($@) if $@;
my $form = CGI::FormBuilder->new(
title => "signin",
name => "signin",
charset => "utf-8",
method => 'POST',
required => 'NONE',
javascript => 0,
params => $q,
action => $config{cgiurl},
header => 0,
template => {type => 'div'},
stylesheet => 1,
);
my $buttons=["Login"];
$form->field(name => "do", type => "hidden", value => "signin",
force => 1);
decode_form_utf8($form);
run_hooks(formbuilder_setup => sub {
shift->(form => $form, cgi => $q, session => $session,
buttons => $buttons);
});
decode_form_utf8($form);
if ($form->submitted) {
$form->validate;
}
if ($returnhtml) {
$form=prepform($form, $buttons, $session, $q);
return $form->render(submit => $buttons);
}
showform($form, $buttons, $session, $q);
}
sub cgi_postsignin ($$) {
my $q=shift;
my $session=shift;
# Continue with whatever was being done before the signin process.
if (defined $session->param("postsignin")) {
my $postsignin=CGI->new($session->param("postsignin"));
$session->clear("postsignin");
cgi($postsignin, $session);
cgi_savesession($session);
exit;
}
else {
if ($config{sslcookie} && ! $q->https()) {
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error(gettext("probable misconfiguration: sslcookie is set, but you are attempting to login via http, not https"));
}
else {
error(gettext("login failed, perhaps you need to turn on cookies?"));
}
}
}
sub cgi_prefs ($$) {
my $q=shift;
my $session=shift;
needsignin($q, $session);
decode_cgi_utf8($q);
# The session id is stored on the form and checked to
# guard against CSRF.
my $sid=$q->param('sid');
if (! defined $sid) {
$q->delete_all;
}
elsif ($sid ne $session->id) {
error(gettext("Your login session has expired."));
}
eval q{use CGI::FormBuilder};
error($@) if $@;
my $form = CGI::FormBuilder->new(
title => "preferences",
name => "preferences",
header => 0,
charset => "utf-8",
method => 'POST',
validate => {
email => 'EMAIL',
},
required => 'NONE',
javascript => 0,
params => $q,
action => $config{cgiurl},
template => {type => 'div'},
stylesheet => 1,
fieldsets => [
[login => gettext("Login")],
[preferences => gettext("Preferences")],
[admin => gettext("Admin")]
],
);
my $buttons=["Save Preferences", "Logout", "Cancel"];
decode_form_utf8($form);
run_hooks(formbuilder_setup => sub {
shift->(form => $form, cgi => $q, session => $session,
buttons => $buttons);
});
decode_form_utf8($form);
$form->field(name => "do", type => "hidden", value => "prefs",
force => 1);
$form->field(name => "sid", type => "hidden", value => $session->id,
force => 1);
$form->field(name => "email", size => 50, fieldset => "preferences");
my $user_name=$session->param("name");
if (! $form->submitted) {
$form->field(name => "email", force => 1,
value => userinfo_get($user_name, "email"));
}
if ($form->submitted eq 'Logout') {
$session->delete();
redirect($q, $config{url});
return;
}
elsif ($form->submitted eq 'Cancel') {
redirect($q, $config{url});
return;
}
elsif ($form->submitted eq 'Save Preferences' && $form->validate) {
if (defined $form->field('email')) {
userinfo_set($user_name, 'email', $form->field('email')) ||
error("failed to set email");
}
$form->text(gettext("Preferences saved."));
}
showform($form, $buttons, $session, $q);
}
sub cgi_custom_failure ($$$) {
my $q=shift;
my $httpstatus=shift;
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my $message=shift;
print $q->header(
-status => $httpstatus,
-charset => 'utf-8',
);
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print $message;
# Internet Explod^Hrer won't show custom 404 responses
# unless they're >= 512 bytes
print ' ' x 512;
exit;
}
sub check_banned ($$) {
my $q=shift;
my $session=shift;
my $banned=0;
my $name=$session->param("name");
if (defined $name &&
grep { $name eq $_ } @{$config{banned_users}}) {
$banned=1;
}
foreach my $b (@{$config{banned_users}}) {
if (pagespec_match("", $b,
ip => $ENV{REMOTE_ADDR},
name => defined $name ? $name : "",
)) {
$banned=1;
last;
}
}
if ($banned) {
$session->delete();
cgi_savesession($session);
cgi_custom_failure(
$q, "403 Forbidden",
gettext("You are banned."));
}
}
sub cgi_getsession ($) {
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my $q=shift;
eval q{use CGI::Session; use HTML::Entities};
error($@) if $@;
CGI::Session->name("ikiwiki_session_".encode_entities($config{wikiname}));
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my $oldmask=umask(077);
my $session = eval {
CGI::Session->new("driver:DB_File", $q,
{ FileName => "$config{wikistatedir}/sessions.db" })
};
if (! $session || $@) {
error($@." ".CGI::Session->errstr());
}
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umask($oldmask);
return $session;
}
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# To guard against CSRF, the user's session id (sid)
# can be stored on a form. This function will check
# (for logged in users) that the sid on the form matches
# the session id in the cookie.
sub checksessionexpiry ($$) {
my $q=shift;
my $session = shift;
if (defined $session->param("name")) {
my $sid=$q->param('sid');
if (! defined $sid || $sid ne $session->id) {
error(gettext("Your login session has expired."));
}
}
}
sub cgi_savesession ($) {
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my $session=shift;
# Force session flush with safe umask.
my $oldmask=umask(077);
$session->flush;
umask($oldmask);
}
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sub cgi (;$$) {
my $q=shift;
my $session=shift;
eval q{use CGI};
error($@) if $@;
$CGI::DISABLE_UPLOADS=$config{cgi_disable_uploads};
if (! $q) {
binmode(STDIN);
$q=CGI->new;
binmode(STDIN, ":utf8");
run_hooks(cgi => sub { shift->($q) });
}
my $do=$q->param('do');
if (! defined $do || ! length $do) {
my $error = $q->cgi_error;
if ($error) {
error("Request not processed: $error");
}
else {
error("\"do\" parameter missing");
}
}
# Need to lock the wiki before getting a session.
lockwiki();
loadindex();
if (! $session) {
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$session=cgi_getsession($q);
}
# Auth hooks can sign a user in.
if ($do ne 'signin' && ! defined $session->param("name")) {
run_hooks(auth => sub {
shift->($q, $session)
});
if (defined $session->param("name")) {
# Make sure whatever user was authed is in the
# userinfo db.
if (! userinfo_get($session->param("name"), "regdate")) {
userinfo_setall($session->param("name"), {
email => "",
password => "",
regdate => time,
}) || error("failed adding user");
}
}
}
check_banned($q, $session);
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run_hooks(sessioncgi => sub { shift->($q, $session) });
if ($do eq 'signin') {
cgi_signin($q, $session);
cgi_savesession($session);
}
elsif ($do eq 'prefs') {
cgi_prefs($q, $session);
}
elsif (defined $session->param("postsignin") || $do eq 'postsignin') {
cgi_postsignin($q, $session);
}
else {
error("unknown do parameter");
}
}
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# Does not need to be called directly; all errors will go through here.
sub cgierror ($) {
my $message=shift;
print "Content-type: text/html\n\n";
print misctemplate(gettext("Error"),
"<p class=\"error\">".gettext("Error").": $message</p>");
die $@;
}
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