typo

[git.ikiwiki.info.git] / IkiWiki / CGI.pm

diff --git a/IkiWiki/CGI.pm b/IkiWiki/CGI.pm
index 73727805a38286d4b3c33f9a914d7231ce252f59..f2a32a9581077553d5b542fde40f428c15a5e41a 100644 (file)
--- a/IkiWiki/CGI.pm
+++ b/IkiWiki/CGI.pm
@@ -1,5 +1,7 @@
 #!/usr/bin/perl
 
 #!/usr/bin/perl
 

+package IkiWiki;
+

 use warnings;
 use strict;
 use IkiWiki;
 use warnings;
 use strict;
 use IkiWiki;


@@ -7,23 +9,50 @@ use IkiWiki::UserInfo;
 use open qw{:utf8 :std};
 use Encode;
 
 use open qw{:utf8 :std};
 use Encode;
 

-package IkiWiki;
-
-sub printheader ($) { #{{{
+sub printheader ($) {

        my $session=shift;
        
        if ($config{sslcookie}) {
                print $session->header(-charset => 'utf-8',
        my $session=shift;
        
        if ($config{sslcookie}) {
                print $session->header(-charset => 'utf-8',

-                       -cookie => $session->cookie(-secure => 1));
-       } else {
-               print $session->header(-charset => 'utf-8');
+                       -cookie => $session->cookie(-httponly => 1, -secure => 1));
+       }
+       else {
+               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;

 
 

-sub redirect ($$) { #{{{
+       printheader($session);
+       print misctemplate($form->title, $form->render(submit => $buttons), @_);
+}
+
+sub redirect ($$) {

        my $q=shift;
        my $q=shift;

-       my $url=shift;
+       eval q{use URI};
+       my $url=URI->new(shift);

        if (! $config{w3mmode}) {
                print $q->redirect($url);
        }
        if (! $config{w3mmode}) {
                print $q->redirect($url);
        }


@@ -31,113 +60,57 @@ sub redirect ($$) { #{{{
                print "Content-type: text/plain\n";
                print "W3m-control: GOTO $url\n\n";
        }
                print "Content-type: text/plain\n";
                print "W3m-control: GOTO $url\n\n";
        }

-} #}}}
+}

 
 

-sub check_canedit ($$$;$) { #{{{
-       my $page=shift;
-       my $q=shift;
-       my $session=shift;
-       my $nonfatal=shift;
-       
-       my $canedit;
-       run_hooks(canedit => sub {
-               return if defined $canedit;
-               my $ret=shift->($page, $q, $session);
-               if (defined $ret && $ret eq "") {
-                       $canedit=1;
-               }
-               elsif (defined $ret) {
-                       $canedit=0;
-                       error($ret) unless $nonfatal;
+sub decode_cgi_utf8 ($) {
+       # 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));

                }
                }

-       });
-       return $canedit;
-} #}}}
-
-sub decode_form_utf8 ($) { #{{{
-       my $form = shift;
-       foreach my $f ($form->field) {
-               next if Encode::is_utf8(scalar $form->field($f));
-               $form->field(name  => $f,
-                            value => decode_utf8($form->field($f)),
-                            force => 1,
-                           );

        }
        }

-} #}}}
-
-sub cgi_recentchanges ($) { #{{{
-       my $q=shift;
-       
-       # Optimisation: building recentchanges means calculating lots of
-       # links. Memoizing htmllink speeds it up a lot (can't be memoized
-       # during page builds as the return values may change, but they
-       # won't here.)
-       eval q{use Memoize};
-       error($@) if $@;
-       memoize("htmllink");
-
-       eval q{use Time::Duration};
-       error($@) if $@;
-
-       my $changelog=[rcs_recentchanges(100)];
-       foreach my $change (@$changelog) {
-               $change->{when} = concise(ago($change->{when}));
-
-               $change->{user} = userlink($change->{user});
-
-               my $is_excess = exists $change->{pages}[10]; # limit pages to first 10
-               delete @{$change->{pages}}[10 .. @{$change->{pages}}] if $is_excess;
-               $change->{pages} = [
-                       map {
-                               $_->{link} = htmllink("", "", $_->{page},
-                                       noimageinline => 1,
-                                       linktext => pagetitle($_->{page}));
-                               $_;
-                       } @{$change->{pages}}
-               ];
-               push @{$change->{pages}}, { link => '...' } if $is_excess;
+}
+
+sub decode_form_utf8 ($) {
+       if ($] >= 5.01) {
+               my $form = shift;
+               foreach my $f ($form->field) {
+                       my @value=map { decode_utf8($_) } $form->field($f);
+                       $form->field(name  => $f,
+                                    value => \@value,
+                                    force => 1,
+                       );
+               }

        }
        }

-
-       my $template=template("recentchanges.tmpl"); 
-       $template->param(
-               title => "RecentChanges",
-               indexlink => indexlink(),
-               wikiname => $config{wikiname},
-               changelog => $changelog,
-               baseurl => baseurl(),
-       );
-       run_hooks(pagetemplate => sub {
-               shift->(page => "", destpage => "", template => $template);
-       });
-       print $q->header(-charset => 'utf-8'), $template->output;
-} #}}}
+}

 
 # Check if the user is signed in. If not, redirect to the signin form and
 # save their place to return to later.
 
 # Check if the user is signed in. If not, redirect to the signin form and
 # save their place to return to later.

-sub needsignin ($$) { #{{{
+sub needsignin ($$) {

        my $q=shift;
        my $session=shift;
 
        if (! defined $session->param("name") ||
            ! userinfo_get($session->param("name"), "regdate")) {
        my $q=shift;
        my $session=shift;
 
        if (! defined $session->param("name") ||
            ! userinfo_get($session->param("name"), "regdate")) {

-               if (! defined $session->param("postsignin")) {
-                       $session->param(postsignin => $ENV{QUERY_STRING});
-               }
+               $session->param(postsignin => $ENV{QUERY_STRING});

                cgi_signin($q, $session);
                cgi_savesession($session);
                exit;
        }
                cgi_signin($q, $session);
                cgi_savesession($session);
                exit;
        }

-} #}}} 
+}

 
 

-sub cgi_signin ($$) { #{{{
+sub cgi_signin ($$;$) {

        my $q=shift;
        my $session=shift;
        my $q=shift;
        my $session=shift;

+       my $returnhtml=shift;

 
 

+       decode_cgi_utf8($q);

        eval q{use CGI::FormBuilder};
        error($@) if $@;
        my $form = CGI::FormBuilder->new(
                title => "signin",
        eval q{use CGI::FormBuilder};
        error($@) if $@;
        my $form = CGI::FormBuilder->new(
                title => "signin",

-               header => 1,
+               name => "signin",

                charset => "utf-8",
                method => 'POST',
                required => 'NONE',
                charset => "utf-8",
                method => 'POST',
                required => 'NONE',


@@ -145,39 +118,34 @@ sub cgi_signin ($$) { #{{{
                params => $q,
                action => $config{cgiurl},
                header => 0,
                params => $q,
                action => $config{cgiurl},
                header => 0,

-               template => scalar template_params("signin.tmpl"),
-               stylesheet => baseurl()."style.css",
+               template => {type => 'div'},
+               stylesheet => 1,

        );
        my $buttons=["Login"];
        
        );
        my $buttons=["Login"];
        

-       if ($q->param("do") ne "signin" && !$form->submitted) {
-               $form->text(gettext("You need to log in first."));
-       }

        $form->field(name => "do", type => "hidden", value => "signin",
                force => 1);
        
        $form->field(name => "do", type => "hidden", value => "signin",
                force => 1);
        

+       decode_form_utf8($form);

        run_hooks(formbuilder_setup => sub {
        run_hooks(formbuilder_setup => sub {

-               shift->(form => $form, cgi => $q, session => $session);
+               shift->(form => $form, cgi => $q, session => $session,
+                       buttons => $buttons);

        });
        });

-       

        decode_form_utf8($form);
 
        decode_form_utf8($form);
 

-       if (exists $hooks{formbuilder}) {
-               run_hooks(formbuilder => sub {
-                       shift->(form => $form, cgi => $q, session => $session,
-                               buttons => $buttons);
-               });
+       if ($form->submitted) {
+               $form->validate;

        }
        }

-       else {
-               if ($form->submitted) {
-                       $form->validate;
-               }
-               printheader($session);
-               print misctemplate($form->title, $form->render(submit => $buttons));
+
+       if ($returnhtml) {
+               $form=prepform($form, $buttons, $session, $q);
+               return $form->render(submit => $buttons);

        }
        }

-} #}}}

 
 

-sub cgi_postsignin ($$) { #{{{
+       showform($form, $buttons, $session, $q);
+}
+
+sub cgi_postsignin ($$) {

        my $q=shift;
        my $session=shift;
        
        my $q=shift;
        my $session=shift;
        


@@ -190,22 +158,37 @@ sub cgi_postsignin ($$) { #{{{
                exit;
        }
        else {
                exit;
        }
        else {

-               # This can occur, for example, if a user went to the signin
-               # url via a bookmark.
-               redirect($q, $config{url});
+               if ($config{sslcookie} && ! $q->https()) {
+                       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 ($$) { #{{{
+sub cgi_prefs ($$) {

        my $q=shift;
        my $session=shift;
 
        needsignin($q, $session);
        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",
 
        eval q{use CGI::FormBuilder};
        error($@) if $@;
        my $form = CGI::FormBuilder->new(
                title => "preferences",

+               name => "preferences",

                header => 0,
                charset => "utf-8",
                method => 'POST',
                header => 0,
                charset => "utf-8",
                method => 'POST',


@@ -216,39 +199,36 @@ sub cgi_prefs ($$) { #{{{
                javascript => 0,
                params => $q,
                action => $config{cgiurl},
                javascript => 0,
                params => $q,
                action => $config{cgiurl},

-               template => scalar template_params("prefs.tmpl"),
-               stylesheet => baseurl()."style.css",
+               template => {type => 'div'},
+               stylesheet => 1,
+               fieldsets => [
+                       [login => gettext("Login")],
+                       [preferences => gettext("Preferences")],
+                       [admin => gettext("Admin")]
+               ],

        );
        my $buttons=["Save Preferences", "Logout", "Cancel"];
        );
        my $buttons=["Save Preferences", "Logout", "Cancel"];

-
+       
+       decode_form_utf8($form);

        run_hooks(formbuilder_setup => sub {
        run_hooks(formbuilder_setup => sub {

-               shift->(form => $form, cgi => $q, session => $session);
+               shift->(form => $form, cgi => $q, session => $session,
+                       buttons => $buttons);

        });
        });

+       decode_form_utf8($form);

        
        

-       $form->field(name => "do", type => "hidden");
-       $form->field(name => "email", size => 50);
-       $form->field(name => "subscriptions", size => 50,
-               comment => "(".htmllink("", "", "PageSpec", noimageinline => 1).")");
-       $form->field(name => "banned_users", size => 50);
+       $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");
        
        my $user_name=$session->param("name");

-       if (! is_admin($user_name)) {
-               $form->field(name => "banned_users", type => "hidden");
-       }

 
        if (! $form->submitted) {
                $form->field(name => "email", force => 1,
                        value => userinfo_get($user_name, "email"));
 
        if (! $form->submitted) {
                $form->field(name => "email", force => 1,
                        value => userinfo_get($user_name, "email"));

-               $form->field(name => "subscriptions", force => 1,
-                       value => userinfo_get($user_name, "subscriptions"));
-               if (is_admin($user_name)) {
-                       $form->field(name => "banned_users", force => 1,
-                               value => join(" ", get_banned_users()));
-               }

        }
        
        }
        

-       decode_form_utf8($form);
-       

        if ($form->submitted eq 'Logout') {
                $session->delete();
                redirect($q, $config{url});
        if ($form->submitted eq 'Logout') {
                $session->delete();
                redirect($q, $config{url});


@@ -259,351 +239,125 @@ sub cgi_prefs ($$) { #{{{
                return;
        }
        elsif ($form->submitted eq 'Save Preferences' && $form->validate) {
                return;
        }
        elsif ($form->submitted eq 'Save Preferences' && $form->validate) {

-               foreach my $field (qw(email subscriptions)) {
-                       if (defined $form->field($field) && length $form->field($field)) {
-                               userinfo_set($user_name, $field, $form->field($field)) ||
-                                       error("failed to set $field");
-                       }
-               }
-               if (is_admin($user_name)) {
-                       set_banned_users(grep { ! is_admin($_) }
-                                       split(' ',
-                                               $form->field("banned_users"))) ||
-                               error("failed saving changes");
+               if (defined $form->field('email')) {
+                       userinfo_set($user_name, 'email', $form->field('email')) ||
+                               error("failed to set email");

                }
                }

+

                $form->text(gettext("Preferences saved."));
        }
        
                $form->text(gettext("Preferences saved."));
        }
        

-       if (exists $hooks{formbuilder}) {
-               run_hooks(formbuilder => sub {
-                       shift->(form => $form, cgi => $q, session => $session,
-                               buttons => $buttons);
-               });
-       }
-       else {
-               printheader($session);
-               print misctemplate($form->title, $form->render(submit => $buttons));
-       }
-} #}}}
+       showform($form, $buttons, $session, $q,
+               prefsurl => "", # avoid showing the preferences link
+       );
+}

 
 

-sub cgi_editpage ($$) { #{{{
+sub cgi_custom_failure ($$$) {

        my $q=shift;
        my $q=shift;

-       my $session=shift;
+       my $httpstatus=shift;
+       my $message=shift;

 
 

-       my @fields=qw(do rcsinfo subpage from page type editcontent comments
-                     newfile);
-       my @buttons=("Save Page", "Preview", "Cancel");
-       
-       eval q{use CGI::FormBuilder};
-       error($@) if $@;
-       my $form = CGI::FormBuilder->new(
-               fields => \@fields,
-               header => 1,
-               charset => "utf-8",
-               method => 'POST',
-               validate => {
-                       editcontent => '/.+/',
-               },
-               required => [qw{editcontent}],
-               javascript => 0,
-               params => $q,
-               action => $config{cgiurl},
-               table => 0,
-               template => scalar template_params("editpage.tmpl"),
+       print $q->header(
+               -status => $httpstatus,
+               -charset => 'utf-8',

        );
        );

-       
-       run_hooks(formbuilder_setup => sub {
-               shift->(form => $form, cgi => $q, session => $session);
-       });
-       
-       decode_form_utf8($form);
-       
-       # This untaint is safe because titlepage removes any problematic
-       # characters.
-       my ($page)=$form->field('page');
-       $page=titlepage(possibly_foolish_untaint($page));
-       if (! defined $page || ! length $page || file_pruned($page, $config{srcdir}) || $page=~/^\//) {
-               error("bad page name");
-       }
-       
-       my $from;
-       if (defined $form->field('from')) {
-               ($from)=$form->field('from')=~/$config{wiki_file_regexp}/;
-       }
-       
-       my $file;
-       my $type;
-       if (exists $pagesources{$page}) {
-               $file=$pagesources{$page};
-               $type=pagetype($file);
-               if (! defined $type) {
-                       error(sprintf(gettext("%s is not an editable page"), $page));
-               }
-       }
-       else {
-               $type=$form->param('type');
-               if (defined $type && length $type && $hooks{htmlize}{$type}) {
-                       $type=possibly_foolish_untaint($type);
-               }
-               elsif (defined $from) {
-                       # favor the type of linking page
-                       $type=pagetype($pagesources{$from});
-               }
-               $type=$config{default_pageext} unless defined $type;
-               $file=$page.".".$type;
-       }
+       print $message;

 
 

-       $form->field(name => "do", type => 'hidden');
-       $form->field(name => "from", type => 'hidden');
-       $form->field(name => "rcsinfo", type => 'hidden');
-       $form->field(name => "subpage", type => 'hidden');
-       $form->field(name => "page", value => pagetitle($page, 1), force => 1);
-       $form->field(name => "type", value => $type, force => 1);
-       $form->field(name => "comments", type => "text", size => 80);
-       $form->field(name => "editcontent", type => "textarea", rows => 20,
-               cols => 80);
-       $form->field(name => "newfile", type => 'hidden');
-       $form->tmpl_param("can_commit", $config{rcs});
-       $form->tmpl_param("indexlink", indexlink());
-       $form->tmpl_param("helponformattinglink",
-               htmllink("", "", "HelpOnFormatting", noimageinline => 1));
-       $form->tmpl_param("baseurl", baseurl());
-       if (! $form->submitted) {
-               $form->field(name => "rcsinfo", value => rcs_prepedit($file),
-                       force => 1);
-               $form->field(name => "newfile", 
-                       value => ! -e "$config{srcdir}/$file",
-                       force => 1);
-       }
-       
-       if ($form->submitted eq "Cancel") {
-               if ($form->field(name => "newfile") && defined $from) {
-                       redirect($q, "$config{url}/".htmlpage($from));
-               }
-               elsif ($form->field(name => "newfile")) {
-                       redirect($q, $config{url});
-               }
-               else {
-                       redirect($q, "$config{url}/".htmlpage($page));
-               }
-               return;
-       }
-       elsif ($form->submitted eq "Preview") {
-               $form->tmpl_param("page_preview",
-                       htmlize($page, $type,
-                       linkify($page, "",
-                       preprocess($page, $page,
-                       filter($page, $form->field('editcontent')), 0, 1))));
-       }
-       else {
-               $form->tmpl_param("page_preview", "");
+       # 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;

        }
        }

-       $form->tmpl_param("page_conflict", "");
-       
-       if (! $form->submitted || $form->submitted eq "Preview" || 
-           ! $form->validate) {
-               if ($form->field("do") eq "create") {
-                       my @page_locs;
-                       my $best_loc;
-                       if (! defined $from || ! length $from ||
-                           $from ne $form->field('from') ||
-                           file_pruned($from, $config{srcdir}) ||
-                           $from=~/^\// ||
-                           $form->submitted eq "Preview") {
-                               @page_locs=$best_loc=$page;
-                       }
-                       else {
-                               my $dir=$from."/";
-                               $dir=~s![^/]+/+$!!;
-                               
-                               if ((defined $form->field('subpage') && length $form->field('subpage')) ||
-                                   $page eq gettext('discussion')) {
-                                       $best_loc="$from/$page";
-                               }
-                               else {
-                                       $best_loc=$dir.$page;
-                               }
-                               
-                               push @page_locs, $dir.$page;
-                               push @page_locs, "$from/$page";
-                               while (length $dir) {
-                                       $dir=~s![^/]+/+$!!;
-                                       push @page_locs, $dir.$page;
-                               }
-                       }
-                       push @page_locs, "$config{userdir}/$page"
-                               if length $config{userdir};
-
-                       @page_locs = grep {
-                               ! exists $pagecase{lc $_}
-                       } @page_locs;
-                       if (! @page_locs) {
-                               # hmm, someone else made the page in the
-                               # meantime?
-                               redirect($q, "$config{url}/".htmlpage($page));
-                               return;
-                       }

 
 

-                       my @editable_locs = grep {
-                               check_canedit($_, $q, $session, 1)
-                       } @page_locs;
-                       if (! @editable_locs) {
-                               # let it throw an error this time
-                               map { check_canedit($_, $q, $session) } @page_locs;
-                       }
-                       
-                       my @page_types;
-                       if (exists $hooks{htmlize}) {
-                               @page_types=keys %{$hooks{htmlize}};
-                       }
-                       
-                       $form->tmpl_param("page_select", 1);
-                       $form->field(name => "page", type => 'select',
-                               options => [ map { pagetitle($_, 1) } @editable_locs ],
-                               value => pagetitle($best_loc, 1));
-                       $form->field(name => "type", type => 'select',
-                               options => \@page_types);
-                       $form->title(sprintf(gettext("creating %s"), pagetitle($page)));
+       foreach my $b (@{$config{banned_users}}) {
+               if (pagespec_match("", $b,
+                       ip => $session->remote_addr(),
+                       name => defined $name ? $name : "",
+               )) {
+                       $banned=1;
+                       last;

                }
                }

-               elsif ($form->field("do") eq "edit") {
-                       check_canedit($page, $q, $session);
-                       if (! defined $form->field('editcontent') || 
-                           ! length $form->field('editcontent')) {
-                               my $content="";
-                               if (exists $pagesources{$page}) {
-                                       $content=readfile(srcfile($pagesources{$page}));
-                                       $content=~s/\n/\r\n/g;
-                               }
-                               $form->field(name => "editcontent", value => $content,
-                                       force => 1);
-                       }
-                       $form->tmpl_param("page_select", 0);
-                       $form->field(name => "page", type => 'hidden');
-                       $form->field(name => "type", type => 'hidden');
-                       $form->title(sprintf(gettext("editing %s"), pagetitle($page)));
-               }
-               
-               print $form->render(submit => \@buttons);

        }
        }

-       else {
-               # save page
-               check_canedit($page, $q, $session);
-               if (! -e "$config{srcdir}/$file" && ! $form->field(name => 'newfile')){
-                       $form->tmpl_param("page_gone", 1);
-                       $form->field(name => "newfile",
-                                    value => 1, force => 1);
-                       $form->tmpl_param("page_select", 0);
-                       $form->field(name => "page", type => 'hidden');
-                       $form->field(name => "type", type => 'hidden');
-                       print $form->render(submit => \@buttons);
-                       return;
-               }
-               
-               my $content=$form->field('editcontent');
-
-               $content=~s/\r\n/\n/g;
-               $content=~s/\r/\n/g;
-
-               $config{cgi}=0; # avoid cgi error message
-               eval { writefile($file, $config{srcdir}, $content) };
-               $config{cgi}=1;
-               if ($@) {
-                       $form->field(name => "rcsinfo", value => rcs_prepedit($file),
-                               force => 1);
-                       $form->tmpl_param("failed_save", 1);
-                       $form->tmpl_param("error_message", $@);
-                       $form->field("editcontent", value => $content, force => 1);
-                       $form->tmpl_param("page_select", 0);
-                       $form->field(name => "page", type => 'hidden');
-                       $form->field(name => "type", type => 'hidden');
-                       $form->title(sprintf(gettext("editing %s"), $page));
-                       print $form->render(submit => \@buttons);
-                       return;
-               }
-               
-               my $conflict;
-               if ($config{rcs}) {
-                       my $message="";
-                       if (defined $form->field('comments') &&
-                           length $form->field('comments')) {
-                               $message=$form->field('comments');
-                       }
-                       
-                       if ($form->field(name => "newfile")) {
-                               rcs_add($file);
-                       }

 
 

-                       # Prevent deadlock with post-commit hook by
-                       # signaling to it that it should not try to
-                       # do anything (except send commit mails).
-                       disable_commit_hook();
-                       $conflict=rcs_commit($file, $message,
-                               $form->field("rcsinfo"),
-                               $session->param("name"), $ENV{REMOTE_ADDR});
-                       enable_commit_hook();
-                       rcs_update();
-               }
-               
-               # Refresh even if there was a conflict, since other changes
-               # may have been committed while the post-commit hook was
-               # disabled.
-               require IkiWiki::Render;
-               refresh();
-               saveindex();
-
-               if (defined $conflict) {
-                       $form->field(name => "rcsinfo", value => rcs_prepedit($file),
-                               force => 1);
-                       $form->tmpl_param("page_conflict", 1);
-                       $form->field("editcontent", value => $conflict, force => 1);
-                       $form->field("do", "edit", force => 1);
-                       $form->tmpl_param("page_select", 0);
-                       $form->field(name => "page", type => 'hidden');
-                       $form->field(name => "type", type => 'hidden');
-                       $form->title(sprintf(gettext("editing %s"), $page));
-                       print $form->render(submit => \@buttons);
-                       return;
-               }
-               else {
-                       # The trailing question mark tries to avoid broken
-                       # caches and get the most recent version of the page.
-                       redirect($q, "$config{url}/".htmlpage($page)."?updated");
-               }
+       if ($banned) {
+               $session->delete();
+               cgi_savesession($session);
+               cgi_custom_failure(
+                       $q, "403 Forbidden",
+                       gettext("You are banned."));

        }
        }

-} #}}}
+}

 
 

-sub cgi_getsession ($) { #{{{
+sub cgi_getsession ($) {

        my $q=shift;
 
        my $q=shift;
 

-       eval q{use CGI::Session};
-       CGI::Session->name("ikiwiki_session_".encode_utf8($config{wikiname}));
+       eval q{use CGI::Session; use HTML::Entities};
+       error($@) if $@;
+       CGI::Session->name("ikiwiki_session_".encode_entities($config{wikiname}));

        
        my $oldmask=umask(077);
        
        my $oldmask=umask(077);

-       my $session = CGI::Session->new("driver:DB_File", $q,
-               { FileName => "$config{wikistatedir}/sessions.db" });
+       my $session = eval {
+               CGI::Session->new("driver:DB_File", $q,
+                       { FileName => "$config{wikistatedir}/sessions.db" })
+       };
+       if (! $session || $@) {
+               error($@." ".CGI::Session->errstr());
+       }
+       

        umask($oldmask);
 
        return $session;
        umask($oldmask);
 
        return $session;

-} #}}}
+}
+
+# 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 ($) { #{{{
+sub cgi_savesession ($) {

        my $session=shift;
 
        # Force session flush with safe umask.
        my $oldmask=umask(077);
        $session->flush;
        umask($oldmask);
        my $session=shift;
 
        # Force session flush with safe umask.
        my $oldmask=umask(077);
        $session->flush;
        umask($oldmask);

-} #}}}
+}

 
 

-sub cgi (;$$) { #{{{
+sub cgi (;$$) {

        my $q=shift;
        my $session=shift;
 
        my $q=shift;
        my $session=shift;
 

+       eval q{use CGI};
+       error($@) if $@;
+       $CGI::DISABLE_UPLOADS=$config{cgi_disable_uploads};
+

        if (! $q) {
        if (! $q) {

-               eval q{use CGI};
-               error($@) if $@;
-       
+               binmode(STDIN);

                $q=CGI->new;
                $q=CGI->new;

+               binmode(STDIN, ":utf8");

        
                run_hooks(cgi => sub { shift->($q) });
        }
        
                run_hooks(cgi => sub { shift->($q) });
        }


@@ -618,18 +372,10 @@ sub cgi (;$$) { #{{{
                        error("\"do\" parameter missing");
                }
        }
                        error("\"do\" parameter missing");
                }
        }

-       
-       # Things that do not need a session.
-       if ($do eq 'recentchanges') {
-               cgi_recentchanges($q);
-               return;
-       }
-       elsif ($do eq 'hyperestraier') {
-               cgi_hyperestraier();
-       }

 
        # Need to lock the wiki before getting a session.
        lockwiki();
 
        # Need to lock the wiki before getting a session.
        lockwiki();

+       loadindex();

        
        if (! $session) {
                $session=cgi_getsession($q);
        
        if (! $session) {
                $session=cgi_getsession($q);


@@ -653,75 +399,33 @@ sub cgi (;$$) { #{{{
                }
        }
        
                }
        }
        

-       if (defined $session->param("name") &&
-           userinfo_get($session->param("name"), "banned")) {
-               print $q->header(-status => "403 Forbidden");
-               $session->delete();
-               print gettext("You are banned.");
-               cgi_savesession($session);
-       }
-       elsif ($do eq 'signin') {
+       check_banned($q, $session);
+       
+       run_hooks(sessioncgi => sub { shift->($q, $session) });
+
+       if ($do eq 'signin') {

                cgi_signin($q, $session);
                cgi_savesession($session);
        }
                cgi_signin($q, $session);
                cgi_savesession($session);
        }

-       elsif (defined $session->param("postsignin")) {
-               cgi_postsignin($q, $session);
-       }

        elsif ($do eq 'prefs') {
                cgi_prefs($q, $session);
        }
        elsif ($do eq 'prefs') {
                cgi_prefs($q, $session);
        }

-       elsif ($do eq 'create' || $do eq 'edit') {
-               cgi_editpage($q, $session);
-       }
-       elsif ($do eq 'blog') {
-               my $page=decode_utf8($q->param('title'));
-               $page=~s/\///g; # no slashes in blog posts
-               # if the page already exists, munge it to be unique
-               my $from=$q->param('from');
-               my $add="";
-               while (exists $pagecase{lc($from."/".titlepage($page).$add)}) {
-                       $add=1 unless length $add;
-                       $add++;
-               }
-               $q->param('page', $page.$add);
-               # now run same as create
-               $q->param('do', 'create');
-               cgi_editpage($q, $session);
-       }
-       elsif ($do eq 'postsignin') {
-               error(gettext("login failed, perhaps you need to turn on cookies?"));
+       elsif (defined $session->param("postsignin") || $do eq 'postsignin') {
+               cgi_postsignin($q, $session);

        }
        else {
                error("unknown do parameter");
        }
        }
        else {
                error("unknown do parameter");
        }

-} #}}}
+}

 
 

-sub userlink ($) { #{{{
-       my $user=shift;
+# Does not need to be called directly; all errors will go through here.
+sub cgierror ($) {
+       my $message=shift;

 
 

-       eval q{use CGI 'escapeHTML'};
-       error($@) if $@;
-       if ($user =~ m!^https?://! &&
-           eval q{use Net::OpenID::VerifiedIdentity; 1} && !$@) {
-               # Munge user-urls, as used by eg, OpenID.
-               my $oid=Net::OpenID::VerifiedIdentity->new(identity => $user);
-               my $display=$oid->display;
-               # Convert "user.somehost.com" to "user [somehost.com]".
-               if ($display !~ /\[/) {
-                       $display=~s/^(.*?)\.([^.]+\.[a-z]+)$/$1 [$2]/;
-               }
-               # Convert "http://somehost.com/user" to "user [somehost.com]".
-               if ($display !~ /\[/) {
-                       $display=~s/^https?:\/\/(.+)\/([^\/]+)$/$2 [$1]/;
-               }
-               $display=~s!^https?://!!; # make sure this is removed
-               return "<a href=\"$user\">".escapeHTML($display)."</a>";
-       }
-       else {
-               return htmllink("", "", escapeHTML(
-                       length $config{userdir} ? $config{userdir}."/".$user : $user
-               ), noimageinline => 1);
-       }
-} #}}}
+       print "Content-type: text/html\n\n";
+       print misctemplate(gettext("Error"),
+               "<p class=\"error\">".gettext("Error").": $message</p>");
+       die $@;
+}

 
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