avoid uninitialised value

[ikiwiki.git] / IkiWiki / CGI.pm

diff --git a/IkiWiki/CGI.pm b/IkiWiki/CGI.pm
index 3f588e427146e3792f19a37ce44cf4b929847aa3..65136a26947a2cae9ee5eeecc52ed092e33b197b 100644 (file)
--- a/IkiWiki/CGI.pm
+++ b/IkiWiki/CGI.pm
@@ -21,7 +21,7 @@ sub printheader ($) { #{{{
 
 } #}}}
 
-sub showform ($$$$) { #{{{
+sub showform ($$$$;@) { #{{{
        my $form=shift;
        my $buttons=shift;
        my $session=shift;
@@ -35,7 +35,7 @@ sub showform ($$$$) { #{{{
        }
 
        printheader($session);
-       print misctemplate($form->title, $form->render(submit => $buttons));
+       print misctemplate($form->title, $form->render(submit => $buttons), @_);
 }
 
 sub redirect ($$) { #{{{
@@ -161,8 +161,18 @@ sub cgi_prefs ($$) { #{{{
        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(
@@ -193,7 +203,10 @@ sub cgi_prefs ($$) { #{{{
                        buttons => $buttons);
        });
        
-       $form->field(name => "do", type => "hidden");
+       $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");
        $form->field(name => "banned_users", size => 50,
                fieldset => "admin");
@@ -241,11 +254,11 @@ sub cgi_prefs ($$) { #{{{
 sub cgi_editpage ($$) { #{{{
        my $q=shift;
        my $session=shift;
-
-       my @fields=qw(do rcsinfo subpage from page type editcontent comments);
-       my @buttons=("Save Page", "Preview", "Cancel");
        
        decode_cgi_utf8($q);
+       
+       my @fields=qw(do rcsinfo subpage from page type editcontent comments);
+       my @buttons=("Save Page", "Preview", "Cancel");
        eval q{use CGI::FormBuilder};
        error($@) if $@;
        my $form = CGI::FormBuilder->new(
@@ -276,6 +289,8 @@ sub cgi_editpage ($$) { #{{{
            file_pruned($page, $config{srcdir}) || $page=~/^\//) {
                error("bad page name");
        }
+
+       my $baseurl=$config{url}."/".htmlpage($page);
        
        my $from;
        if (defined $form->field('from')) {
@@ -314,6 +329,8 @@ sub cgi_editpage ($$) { #{{{
        }
 
        $form->field(name => "do", type => 'hidden');
+       $form->field(name => "sid", type => "hidden", value => $session->id,
+               force => 1);
        $form->field(name => "from", type => 'hidden');
        $form->field(name => "rcsinfo", type => 'hidden');
        $form->field(name => "subpage", type => 'hidden');
@@ -325,10 +342,9 @@ sub cgi_editpage ($$) { #{{{
        $form->tmpl_param("can_commit", $config{rcs});
        $form->tmpl_param("indexlink", indexlink());
        $form->tmpl_param("helponformattinglink",
-               htmllink("", "", "ikiwiki/formatting",
+               htmllink($page, $page, "ikiwiki/formatting",
                        noimageinline => 1,
                        linktext => "FormattingHelp"));
-       $form->tmpl_param("baseurl", baseurl());
        
        if ($form->submitted eq "Cancel") {
                if ($form->field("do") eq "create" && defined $from) {
@@ -343,6 +359,12 @@ sub cgi_editpage ($$) { #{{{
                return;
        }
        elsif ($form->submitted eq "Preview") {
+               my $new=not exists $pagesources{$page};
+               if ($new) {
+                       # temporarily record its type
+                       $pagesources{$page}=$page.".".$type;
+               }
+
                my $content=$form->field('editcontent');
                run_hooks(editcontent => sub {
                        $content=shift->(
@@ -354,9 +376,15 @@ sub cgi_editpage ($$) { #{{{
                });
                $form->tmpl_param("page_preview",
                        htmlize($page, $type,
-                       linkify($page, "",
+                       linkify($page, $page,
                        preprocess($page, $page,
                        filter($page, $page, $content), 0, 1))));
+               
+               if ($new) {
+                       delete $pagesources{$page};
+               }
+               # previewing may have created files on disk
+               saveindex();
        }
        elsif ($form->submitted eq "Save Page") {
                $form->tmpl_param("page_preview", "");
@@ -392,9 +420,10 @@ sub cgi_editpage ($$) { #{{{
                                        $dir=~s![^/]+/+$!!;
                                        push @page_locs, $dir.$page;
                                }
+                       
+                               push @page_locs, "$config{userdir}/$page"
+                                       if length $config{userdir};
                        }
-                       push @page_locs, "$config{userdir}/$page"
-                               if length $config{userdir};
 
                        @page_locs = grep {
                                ! exists $pagecase{lc $_}
@@ -402,8 +431,16 @@ sub cgi_editpage ($$) { #{{{
                        if (! @page_locs) {
                                # hmm, someone else made the page in the
                                # meantime?
-                               redirect($q, "$config{url}/".htmlpage($page));
-                               return;
+                               if ($form->submitted eq "Preview") {
+                                       # let them go ahead with the edit
+                                       # and resolve the conflict at save
+                                       # time
+                                       @page_locs=$page;
+                               }
+                               else {
+                                       redirect($q, "$config{url}/".htmlpage($page));
+                                       return;
+                               }
                        }
 
                        my @editable_locs = grep {
@@ -447,12 +484,21 @@ sub cgi_editpage ($$) { #{{{
                        $form->title(sprintf(gettext("editing %s"), pagetitle($page)));
                }
                
-               showform($form, \@buttons, $session, $q);
-               saveindex();
+               showform($form, \@buttons, $session, $q, forcebaseurl => $baseurl);
        }
        else {
                # save page
                check_canedit($page, $q, $session);
+       
+               # The session id is stored on the form and checked to
+               # guard against CSRF. But only if the user is logged in,
+               # as anonok can allow anonymous edits.
+               if (defined $session->param("name")) {
+                       my $sid=$q->param('sid');
+                       if (! defined $sid || $sid ne $session->id) {
+                               error(gettext("Your login session has expired."));
+                       }
+               }
 
                my $exists=-e "$config{srcdir}/$file";
 
@@ -464,7 +510,7 @@ sub cgi_editpage ($$) { #{{{
                        $form->field(name => "page", type => 'hidden');
                        $form->field(name => "type", type => 'hidden');
                        $form->title(sprintf(gettext("editing %s"), $page));
-                       showform($form, \@buttons, $session, $q);
+                       showform($form, \@buttons, $session, $q, forcebaseurl => $baseurl);
                        return;
                }
                elsif ($form->field("do") eq "create" && $exists) {
@@ -478,7 +524,7 @@ sub cgi_editpage ($$) { #{{{
                                value => readfile("$config{srcdir}/$file").
                                         "\n\n\n".$form->field("editcontent"),
                                force => 1);
-                       showform($form, \@buttons, $session, $q);
+                       showform($form, \@buttons, $session, $q, forcebaseurl => $baseurl);
                        return;
                }
                
@@ -508,7 +554,8 @@ sub cgi_editpage ($$) { #{{{
                        $form->field(name => "page", type => 'hidden');
                        $form->field(name => "type", type => 'hidden');
                        $form->title(sprintf(gettext("editing %s"), $page));
-                       showform($form, \@buttons, $session, $q);
+                       showform($form, \@buttons, $session, $q,
+                               forcebaseurl => $baseurl);
                        return;
                }
                
@@ -526,7 +573,7 @@ sub cgi_editpage ($$) { #{{{
 
                        # Prevent deadlock with post-commit hook by
                        # signaling to it that it should not try to
-                       # do anything (except send commit mails).
+                       # do anything.
                        disable_commit_hook();
                        $conflict=rcs_commit($file, $message,
                                $form->field("rcsinfo"),
@@ -552,7 +599,8 @@ sub cgi_editpage ($$) { #{{{
                        $form->field(name => "page", type => 'hidden');
                        $form->field(name => "type", type => 'hidden');
                        $form->title(sprintf(gettext("editing %s"), $page));
-                       showform($form, \@buttons, $session, $q);
+                       showform($form, \@buttons, $session, $q,
+                               forcebaseurl => $baseurl);
                        return;
                }
                else {