]> git.vanrenterghem.biz Git - git.ikiwiki.info.git/blobdiff - IkiWiki/CGI.pm
move contrib/po to po/discussion
[git.ikiwiki.info.git] / IkiWiki / CGI.pm
index 8b01ca3f89ab004a81d04d4066d081c3d3baea65..04f24b04f986c2618b0cbf619e09ba7dfbff58ee 100644 (file)
@@ -1,5 +1,7 @@
 #!/usr/bin/perl
 
+package IkiWiki;
+
 use warnings;
 use strict;
 use IkiWiki;
@@ -7,21 +9,36 @@ use IkiWiki::UserInfo;
 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',
-                       -cookie => $session->cookie(-secure => 1));
+                       -cookie => $session->cookie(-httponly => 1, -secure => 1));
        } else {
-               print $session->header(-charset => 'utf-8');
+               print $session->header(-charset => 'utf-8',
+                       -cookie => $session->cookie(-httponly => 1));
        }
+}
 
-} #}}}
+sub showform ($$$$;@) {
+       my $form=shift;
+       my $buttons=shift;
+       my $session=shift;
+       my $cgi=shift;
 
-sub redirect ($$) { #{{{
+       if (exists $hooks{formbuilder}) {
+               run_hooks(formbuilder => sub {
+                       shift->(form => $form, cgi => $cgi, session => $session,
+                               buttons => $buttons);
+               });
+       }
+
+       printheader($session);
+       print misctemplate($form->title, $form->render(submit => $buttons), @_);
+}
+
+sub redirect ($$) {
        my $q=shift;
        my $url=shift;
        if (! $config{w3mmode}) {
@@ -31,316 +48,171 @@ sub redirect ($$) { #{{{
                print "Content-type: text/plain\n";
                print "W3m-control: GOTO $url\n\n";
        }
-} #}}}
+}
 
-sub page_locked ($$;$) { #{{{
-       my $page=shift;
-       my $session=shift;
-       my $nonfatal=shift;
-       
-       my $user=$session->param("name");
-       return if defined $user && is_admin($user);
-
-       foreach my $admin (@{$config{adminuser}}) {
-               my $locked_pages=userinfo_get($admin, "locked_pages");
-               if (pagespec_match($page, userinfo_get($admin, "locked_pages"))) {
-                       return 1 if $nonfatal;
-                       error(htmllink("", "", $page, 1)." is locked by ".
-                             htmllink("", "", $admin, 1)." and cannot be edited.");
+sub decode_cgi_utf8 ($) {
+       # decode_form_utf8 method is needed for 5.10
+       if ($] < 5.01) {
+               my $cgi = shift;
+               foreach my $f ($cgi->param) {
+                       $cgi->param($f, map { decode_utf8 $_ } $cgi->param($f));
                }
        }
+}
 
-       return 0;
-} #}}}
-
-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($f)),
-                            force => 1,
-                           );
+sub decode_form_utf8 ($) {
+       if ($] >= 5.01) {
+               my $form = shift;
+               foreach my $f ($form->field) {
+                       $form->field(name  => $f,
+                                    value => decode_utf8($form->field($f)),
+                                    force => 1,
+                       );
+               }
        }
-} #}}}
+}
 
-sub cgi_recentchanges ($) { #{{{
+# 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;
-       
-       unlockwiki();
-
-       # 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};
-       memoize("htmllink");
-
-       eval q{use Time::Duration};
-       eval q{use CGI 'escapeHTML'};
-
-       my $changelog=[rcs_recentchanges(100)];
-       foreach my $change (@$changelog) {
-               $change->{when} = concise(ago($change->{when}));
-               $change->{user} = htmllink("", "", escapeHTML($change->{user}), 1);
-
-               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}, 1);
-                               $_;
-                       } @{$change->{pages}}
-               ];
-               push @{$change->{pages}}, { link => '...' } if $is_excess;
-       }
+       my $session=shift;
 
-       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;
-} #}}}
+       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 ($$) { #{{{
+sub cgi_signin ($$) {
        my $q=shift;
        my $session=shift;
 
+       decode_cgi_utf8($q);
        eval q{use CGI::FormBuilder};
+       error($@) if $@;
        my $form = CGI::FormBuilder->new(
                title => "signin",
-               fields => [qw(do title page subpage from name password confirm_password email)],
-               header => 1,
+               name => "signin",
                charset => "utf-8",
                method => 'POST',
-               validate => {
-                       confirm_password => {
-                               perl => q{eq $form->field("password")},
-                       },
-                       email => 'EMAIL',
-               },
                required => 'NONE',
                javascript => 0,
                params => $q,
                action => $config{cgiurl},
                header => 0,
-               template => (-e "$config{templatedir}/signin.tmpl" ?
-                            {template_params("signin.tmpl")} : ""),
+               template => {type => 'div'},
                stylesheet => baseurl()."style.css",
        );
-               
-       decode_form_utf8($form);
+       my $buttons=["Login"];
        
-       $form->field(name => "name", required => 0);
-       $form->field(name => "do", type => "hidden");
-       $form->field(name => "page", type => "hidden");
-       $form->field(name => "title", type => "hidden");
-       $form->field(name => "from", type => "hidden");
-       $form->field(name => "subpage", type => "hidden");
-       $form->field(name => "password", type => "password", required => 0);
-       $form->field(name => "confirm_password", type => "password", required => 0);
-       $form->field(name => "email", required => 0);
        if ($q->param("do") ne "signin" && !$form->submitted) {
-               $form->text("You need to log in first.");
+               $form->text(gettext("You need to log in first."));
        }
+       $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) {
-               # Set required fields based on how form was submitted.
-               my %required=(
-                       "Login" => [qw(name password)],
-                       "Register" => [qw(name password confirm_password email)],
-                       "Mail Password" => [qw(name)],
-               );
-               foreach my $opt (@{$required{$form->submitted}}) {
-                       $form->field(name => $opt, required => 1);
-               }
+               $form->validate;
+       }
+
+       showform($form, $buttons, $session, $q);
+}
+
+sub cgi_postsignin ($$) {
+       my $q=shift;
+       my $session=shift;
        
-               # Validate password differently depending on how
-               # form was submitted.
-               if ($form->submitted eq 'Login') {
-                       $form->field(
-                               name => "password",
-                               validate => sub {
-                                       length $form->field("name") &&
-                                       shift eq userinfo_get($form->field("name"), 'password');
-                               },
-                       );
-                       $form->field(name => "name", validate => '/^\w+$/');
-               }
-               else {
-                       $form->field(name => "password", validate => 'VALUE');
-               }
-               # And make sure the entered name exists when logging
-               # in or sending email, and does not when registering.
-               if ($form->submitted eq 'Register') {
-                       $form->field(
-                               name => "name",
-                               validate => sub {
-                                       my $name=shift;
-                                       length $name &&
-                                       $name=~/$config{wiki_file_regexp}/ &&
-                                       ! userinfo_get($name, "regdate");
-                               },
-                       );
-               }
-               else {
-                       $form->field(
-                               name => "name",
-                               validate => sub {
-                                       my $name=shift;
-                                       length $name &&
-                                       userinfo_get($name, "regdate");
-                               },
-                       );
-               }
+       # 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 {
-               # First time settings.
-               $form->field(name => "name", comment => "use FirstnameLastName");
-               $form->field(name => "confirm_password", comment => "(only needed");
-               $form->field(name => "email",            comment => "for registration)");
-               if ($session->param("name")) {
-                       $form->field(name => "name", value => $session->param("name"));
+               if ($config{sslcookie} && ! $q->https()) {
+                       error(gettext("probable misconfiguration: sslcookie is set, but you are attepting to login via http, not https"));
                }
-       }
-
-       if ($form->submitted && $form->validate) {
-               if ($form->submitted eq 'Login') {
-                       $session->param("name", $form->field("name"));
-                       if (defined $form->field("do") && 
-                           $form->field("do") ne 'signin') {
-                               redirect($q, cgiurl(
-                                       do => $form->field("do"),
-                                       page => $form->field("page"),
-                                       title => $form->field("title"),
-                                       subpage => $form->field("subpage"),
-                                       from => $form->field("from"),
-                               ));
-                       }
-                       else {
-                               redirect($q, $config{url});
-                       }
-               }
-               elsif ($form->submitted eq 'Register') {
-                       my $user_name=$form->field('name');
-                       if (userinfo_setall($user_name, {
-                                          'email' => $form->field('email'),
-                                          'password' => $form->field('password'),
-                                          'regdate' => time
-                                        })) {
-                               $form->field(name => "confirm_password", type => "hidden");
-                               $form->field(name => "email", type => "hidden");
-                               $form->text("Registration successful. Now you can Login.");
-                               printheader($session);
-                               print misctemplate($form->title, $form->render(submit => ["Login"]));
-                       }
-                       else {
-                               error("Error saving registration.");
-                       }
-               }
-               elsif ($form->submitted eq 'Mail Password') {
-                       my $user_name=$form->field("name");
-                       my $template=template("passwordmail.tmpl");
-                       $template->param(
-                               user_name => $user_name,
-                               user_password => userinfo_get($user_name, "password"),
-                               wikiurl => $config{url},
-                               wikiname => $config{wikiname},
-                               REMOTE_ADDR => $ENV{REMOTE_ADDR},
-                       );
-                       
-                       eval q{use Mail::Sendmail};
-                       sendmail(
-                               To => userinfo_get($user_name, "email"),
-                               From => "$config{wikiname} admin <$config{adminemail}>",
-                               Subject => "$config{wikiname} information",
-                               Message => $template->output,
-                       ) or error("Failed to send mail");
-                       
-                       $form->text("Your password has been emailed to you.");
-                       $form->field(name => "name", required => 0);
-                       printheader($session);
-                       print misctemplate($form->title, $form->render(submit => ["Login", "Register", "Mail Password"]));
+               else {
+                       error(gettext("login failed, perhaps you need to turn on cookies?"));
                }
        }
-       else {
-               printheader($session);
-               print misctemplate($form->title, $form->render(submit => ["Login", "Register", "Mail Password"]));
-       }
-} #}}}
+}
 
-sub cgi_prefs ($$) { #{{{
+sub cgi_prefs ($$) {
        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",
-               fields => [qw(do name password confirm_password email 
-                             subscriptions locked_pages)],
+               name => "preferences",
                header => 0,
                charset => "utf-8",
                method => 'POST',
                validate => {
-                       confirm_password => {
-                               perl => q{eq $form->field("password")},
-                       },
                        email => 'EMAIL',
                },
                required => 'NONE',
                javascript => 0,
                params => $q,
                action => $config{cgiurl},
-               template => (-e "$config{templatedir}/prefs.tmpl" ?
-                            {template_params("prefs.tmpl")} : ""),
+               template => {type => 'div'},
                stylesheet => baseurl()."style.css",
+               fieldsets => [
+                       [login => gettext("Login")],
+                       [preferences => gettext("Preferences")],
+                       [admin => gettext("Admin")]
+               ],
        );
-       my @buttons=("Save Preferences", "Logout", "Cancel");
+       my $buttons=["Save Preferences", "Logout", "Cancel"];
        
-       my $user_name=$session->param("name");
-       $form->field(name => "do", type => "hidden");
-       $form->field(name => "name", disabled => 1,
-               value => $user_name, force => 1);
-       $form->field(name => "password", type => "password");
-       $form->field(name => "confirm_password", type => "password");
-       $form->field(name => "subscriptions", size => 50,
-               comment => "(".htmllink("", "", "PageSpec", 1).")");
-       $form->field(name => "locked_pages", size => 50,
-               comment => "(".htmllink("", "", "PageSpec", 1).")");
-       $form->field(name => "banned_users", size => 50);
+       decode_form_utf8($form);
+       run_hooks(formbuilder_setup => sub {
+               shift->(form => $form, cgi => $q, session => $session,
+                       buttons => $buttons);
+       });
+       decode_form_utf8($form);
        
-       if (! is_admin($user_name)) {
-               $form->field(name => "locked_pages", type => "hidden");
-               $form->field(name => "banned_users", type => "hidden");
-       }
-
-       if ($config{httpauth}) {
-               $form->field(name => "password", type => "hidden");
-               $form->field(name => "confirm_password", 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");
        
+       my $user_name=$session->param("name");
+
        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"));
-               $form->field(name => "locked_pages", force => 1,
-                       value => userinfo_get($user_name, "locked_pages"));
-               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});
@@ -350,289 +222,110 @@ sub cgi_prefs ($$) { #{{{
                redirect($q, $config{url});
                return;
        }
-       elsif ($form->submitted eq "Save Preferences" && $form->validate) {
-               foreach my $field (qw(password email subscriptions locked_pages)) {
-                       if (length $form->field($field)) {
-                               userinfo_set($user_name, $field, $form->field($field)) || error("failed to set $field");
-                       }
+       elsif ($form->submitted eq 'Save Preferences' && $form->validate) {
+               if (defined $form->field('email')) {
+                       userinfo_set($user_name, 'email', $form->field('email')) ||
+                               error("failed to set email");
                }
-               if (is_admin($user_name)) {
-                       set_banned_users(grep { ! is_admin($_) }
-                                       split(' ', $form->field("banned_users")));
-               }
-               $form->text("Preferences saved.");
+
+               $form->text(gettext("Preferences saved."));
        }
        
-       printheader($session);
-       print misctemplate($form->title, $form->render(submit => \@buttons));
-} #}}}
+       showform($form, $buttons, $session, $q);
+}
+
+sub cgi_custom_failure ($$) {
+       my $header=shift;
+       my $message=shift;
+
+       print $header;
+       print $message;
 
-sub cgi_editpage ($$) { #{{{
+       # Internet Explod^Hrer won't show custom 404 responses
+       # unless they're >= 512 bytes
+       print ' ' x 512;
+
+       exit;
+}
+
+sub check_banned ($$) {
        my $q=shift;
        my $session=shift;
 
-       my @fields=qw(do rcsinfo subpage from page type editcontent comments);
-       my @buttons=("Save Page", "Preview", "Cancel");
-       
-       eval q{use CGI::FormBuilder; use CGI::FormBuilder::Template::HTML};
-       my $renderer=CGI::FormBuilder::Template::HTML->new(
-               fields => \@fields,
-               template_params("editpage.tmpl"),
-       );
-       run_hooks(pagetemplate => sub {
-               shift->(page => "", destpage => "", template => $renderer->engine);
-       });
-       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 => $renderer,
-       );
-       
-       decode_form_utf8($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 ||
-           $page=~/$config{wiki_file_prune_regexp}/ || $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);
-       }
-       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});
+       my $name=$session->param("name");
+       if (defined $name) {
+               if (grep { $name eq $_ } @{$config{banned_users}}) {
+                       $session->delete();
+                       cgi_savesession($session);
+                       cgi_custom_failure(
+                               $q->header(-status => "403 Forbidden"),
+                               gettext("You are banned."));
                }
-               $type=$config{default_pageext} unless defined $type;
-               $file=$page.".".$type;
        }
+}
 
-       my $newfile=0;
-       if (! -e "$config{srcdir}/$file") {
-               $newfile=1;
-       }
+sub cgi_getsession ($) {
+       my $q=shift;
 
-       $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 => $page, 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->tmpl_param("can_commit", $config{rcs});
-       $form->tmpl_param("indexlink", indexlink());
-       $form->tmpl_param("helponformattinglink",
-               htmllink("", "", "HelpOnFormatting", 1));
-       $form->tmpl_param("baseurl", baseurl());
-       if (! $form->submitted) {
-               $form->field(name => "rcsinfo", value => rcs_prepedit($file),
-                       force => 1);
-       }
+       eval q{use CGI::Session; use HTML::Entities};
+       error($@) if $@;
+       CGI::Session->name("ikiwiki_session_".encode_entities($config{wikiname}));
        
-       if ($form->submitted eq "Cancel") {
-               if ($newfile && defined $from) {
-                       redirect($q, "$config{url}/".htmlpage($from));
-               }
-               elsif ($newfile) {
-                       redirect($q, $config{url});
-               }
-               else {
-                       redirect($q, "$config{url}/".htmlpage($page));
-               }
-               return;
-       }
-       elsif ($form->submitted eq "Preview") {
-               my $content=$form->field('editcontent');
-               my $comments=$form->field('comments');
-               $form->field(name => "editcontent",
-                               value => $content, force => 1);
-               $form->field(name => "comments",
-                               value => $comments, force => 1);
-               $config{rss}=$config{atom}=0; # avoid preview writing a feed!
-               $form->tmpl_param("page_preview",
-                       htmlize($page, $type,
-                       linkify($page, "",
-                       preprocess($page, $page,
-                       filter($page, $content)))));
-       }
-       else {
-               $form->tmpl_param("page_preview", "");
+       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());
        }
-       $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') ||
-                           $from=~/$config{wiki_file_prune_regexp}/ ||
-                           $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 '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;
-                               }
-                       }
+       umask($oldmask);
 
-                       @page_locs = grep {
-                               ! exists $pagecase{lc $_} &&
-                               ! page_locked($_, $session, 1)
-                       } @page_locs;
-                       
-                       if (! @page_locs) {
-                               # hmm, someone else made the page in the
-                               # meantime?
-                               redirect($q, "$config{url}/".htmlpage($page));
-                               return;
-                       }
-                       
-                       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 => \@page_locs, value => $best_loc);
-                       $form->field(name => "type", type => 'select',
-                               options => \@page_types);
-                       $form->title("creating ".pagetitle($page));
-               }
-               elsif ($form->field("do") eq "edit") {
-                       page_locked($page, $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');
-                       $form->title("editing ".pagetitle($page));
-               }
-               
-               print $form->render(submit => \@buttons);
-       }
-       else {
-               # save page
-               page_locked($page, $session);
-               
-               my $content=$form->field('editcontent');
-
-               $content=~s/\r\n/\n/g;
-               $content=~s/\r/\n/g;
-               writefile($file, $config{srcdir}, $content);
-               
-               my $message="web commit ";
-               if (defined $session->param("name") && 
-                   length $session->param("name")) {
-                       $message.="by ".$session->param("name");
-               }
-               else {
-                       $message.="from $ENV{REMOTE_ADDR}";
-               }
-               if (defined $form->field('comments') &&
-                   length $form->field('comments')) {
-                       $message.=": ".$form->field('comments');
-               }
-               
-               if ($config{rcs}) {
-                       if ($newfile) {
-                               rcs_add($file);
-                       }
-                       # prevent deadlock with post-commit hook
-                       unlockwiki();
-                       # presumably the commit will trigger an update
-                       # of the wiki
-                       my $conflict=rcs_commit($file, $message,
-                               $form->field("rcsinfo"));
-               
-                       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(name => "comments", value => $form->field('comments'), force => 1);
-                               $form->field("do", "edit)");
-                               $form->tmpl_param("page_select", 0);
-                               $form->field(name => "page", type => 'hidden');
-                               $form->field(name => "type", type => 'hidden');
-                               $form->title("editing $page");
-                               print $form->render(submit => \@buttons);
-                               return;
-                       }
-               }
-               else {
-                       require IkiWiki::Render;
-                       refresh();
-                       saveindex();
+       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 ($$) {
+       my $q=shift;
+       my $session = shift;
+
+       if (defined $session->param("name")) {
+               my $sid=$q->param('sid');
+               if (! defined $sid || $sid ne $session->id) {
+                       error(gettext("Your login session has expired."));
                }
-               
-               # The trailing question mark tries to avoid broken
-               # caches and get the most recent version of the page.
-               redirect($q, "$config{url}/".htmlpage($page)."?updated");
        }
-} #}}}
+}
+
+sub cgi_savesession ($) {
+       my $session=shift;
+
+       # Force session flush with safe umask.
+       my $oldmask=umask(077);
+       $session->flush;
+       umask($oldmask);
+}
+
+sub cgi (;$$) {
+       my $q=shift;
+       my $session=shift;
 
-sub cgi () { #{{{
        eval q{use CGI};
-       eval q{use CGI::Session};
-       
-       my $q=CGI->new;
-       
-       run_hooks(cgi => sub { shift->($q) });
+       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;
@@ -643,84 +336,60 @@ sub cgi () { #{{{
                        error("\"do\" parameter missing");
                }
        }
+
+       # Need to lock the wiki before getting a session.
+       lockwiki();
+       loadindex();
        
-       # Things that do not need a session.
-       if ($do eq 'recentchanges') {
-               cgi_recentchanges($q);
-               return;
-       }
-       elsif ($do eq 'hyperestraier') {
-               cgi_hyperestraier();
+       if (! $session) {
+               $session=cgi_getsession($q);
        }
        
-       CGI::Session->name("ikiwiki_session_".encode_utf8($config{wikiname}));
-       
-       my $oldmask=umask(077);
-       my $session = CGI::Session->new("driver:DB_File", $q,
-               { FileName => "$config{wikistatedir}/sessions.db" });
-       umask($oldmask);
-       
-       # Everything below this point needs the user to be signed in.
-       if (((! $config{anonok} || $do eq 'prefs') &&
-            (! $config{httpauth}) &&
-            (! defined $session->param("name") ||
-            ! userinfo_get($session->param("name"), "regdate"))) || $do eq 'signin') {
-               cgi_signin($q, $session);
-       
-               # Force session flush with safe umask.
-               my $oldmask=umask(077);
-               $session->flush;
-               umask($oldmask);
-               
-               return;
-       }
-
-       if ($config{httpauth} && (! defined $session->param("name"))) {
-               if (! defined $q->remote_user()) {
-                       error("Could not determine authenticated username.");
-               }
-               else {
-                       $session->param("name", $q->remote_user());
+       # Auth hooks can sign a user in.
+       if ($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($session->param("name"), {
                                        email => "",
                                        password => "",
-                                       regdate=>time,
-                               });
+                                       regdate => time,
+                               }) || error("failed adding user");
                        }
                }
        }
-
-       if (userinfo_get($session->param("name"), "banned")) {
-               print $q->header(-status => "403 Forbidden");
-               $session->delete();
-               print "You are banned.";
-               exit;
-       }
        
-       if ($do eq 'create' || $do eq 'edit') {
-               cgi_editpage($q, $session);
+       check_banned($q, $session);
+       
+       run_hooks(sessioncgi => sub { shift->($q, $session) });
+
+       if ($do eq 'signin') {
+               cgi_signin($q, $session);
+               cgi_savesession($session);
        }
        elsif ($do eq 'prefs') {
                cgi_prefs($q, $session);
        }
-       elsif ($do eq 'blog') {
-               my $page=titlepage(decode_utf8($q->param('title')));
-               # if the page already exists, munge it to be unique
-               my $from=$q->param('from');
-               my $add="";
-               while (exists $pagecase{lc "$from/$page$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 (defined $session->param("postsignin") || $do eq 'postsignin') {
+               cgi_postsignin($q, $session);
        }
        else {
                error("unknown do parameter");
        }
-} #}}}
+}
+
+# Does not need to be called directly; all errors will go through here.
+sub cgierror ($) {
+       my $message=shift;
+
+       print "Content-type: text/html\n\n";
+       print misctemplate(gettext("Error"),
+               "<p class=\"error\">".gettext("Error").": $message</p>");
+       die $@;
+}
 
 1