path: root/IkiWiki/CGI.pm

#!/usr/bin/perl

package IkiWiki;

use warnings;
use strict;
use IkiWiki;
use IkiWiki::UserInfo;
use open qw{:utf8 :std};
use Encode;

sub printheader ($) { #{{{
    my $session=shift;
    
    if ($config{sslcookie}) {
        print $session->header(-charset => 'utf-8',
            -cookie => $session->cookie(-secure => 1));
    } else {
        print $session->header(-charset => 'utf-8');
    }
} #}}}

sub showform ($$$$;@) { #{{{
    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);
        });
    }

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

sub redirect ($$) { #{{{
    my $q=shift;
    my $url=shift;
    if (! $config{w3mmode}) {
        print $q->redirect($url);
    }
    else {
        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 $ret) {
            if ($ret eq "") {
                $canedit=1;
            }
            elsif (ref $ret eq 'CODE') {
                $ret->() unless $nonfatal;
                $canedit=0;
            }
            elsif (defined $ret) {
                error($ret) unless $nonfatal;
                $canedit=0;
            }
        }
    });
    return $canedit;
} #}}}

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));
        }
    }
} #}}}

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,
            );
        }
    }
} #}}}

# 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;

    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 => baseurl()."style.css",
    );
    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);
    
    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;
    }

    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 {
        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 => baseurl()."style.css",
        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");

    # XXX deprecated, should be removed eventually
    $form->field(name => "banned_users", size => 50, fieldset => "admin");
    if (! is_admin($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 (is_admin($user_name)) {
            my $value=join(" ", get_banned_users());
            if (length $value) {
                $form->field(name => "banned_users", force => 1,
                    value => join(" ", get_banned_users()),
                    comment => "deprecated; please move to banned_users in setup file");
            }
            else {
                $form->field(name => "banned_users", type => "hidden");
            }
        }
    }
    
    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");
        }

        # XXX deprecated, should be removed eventually
        if (is_admin($user_name)) {
            set_banned_users(grep { ! is_admin($_) }
                    split(' ',
                        $form->field("banned_users"))) ||
                error("failed saving changes");
            if (! length $form->field("banned_users")) {
                $form->field(name => "banned_users", type => "hidden");
            }
        }

        $form->text(gettext("Preferences saved."));
    }
    
    showform($form, $buttons, $session, $q);
} #}}}

sub cgi_editpage ($$) { #{{{
    my $q=shift;
    my $session=shift;
    
    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(
        fields => \@fields,
        charset => "utf-8",
        method => 'POST',
        required => [qw{editcontent}],
        javascript => 0,
        params => $q,
        action => $config{cgiurl},
        header => 0,
        table => 0,
        template => scalar template_params("editpage.tmpl"),
        wikiname => $config{wikiname},
    );
    
    decode_form_utf8($form);
    run_hooks(formbuilder_setup => sub {
        shift->(form => $form, cgi => $q, session => $session,
            buttons => \@buttons);
    });
    decode_form_utf8($form);
    
    # This untaint is safe because we check file_pruned.
    my $page=$form->field('page');
    $page=possibly_foolish_untaint($page);
    my $absolute=($page =~ s#^/+##);
    if (! defined $page || ! length $page ||
        file_pruned($page, $config{srcdir})) {
        error("bad page name");
    }

    my $baseurl=$config{url}."/".htmlpage($page);
    
    my $from;
    if (defined $form->field('from')) {
        ($from)=$form->field('from')=~/$config{wiki_file_regexp}/;
    }
    
    my $file;
    my $type;
    if (exists $pagesources{$page} && $form->field("do") ne "create") {
        $file=$pagesources{$page};
        $type=pagetype($file);
        if (! defined $type || $type=~/^_/) {
            error(sprintf(gettext("%s is not an editable page"), $page));
        }
        if (! $form->submitted) {
            $form->field(name => "rcsinfo",
                value => rcs_prepedit($file), force => 1);
        }
        $form->field(name => "editcontent", validate => '/.*/');
    }
    else {
        $type=$form->param('type');
        if (defined $type && length $type && $hooks{htmlize}{$type}) {
            $type=possibly_foolish_untaint($type);
        }
        elsif (defined $from && exists $pagesources{$from}) {
            # favor the type of linking page
            $type=pagetype($pagesources{$from});
        }
        $type=$config{default_pageext} unless defined $type;
        $file=$page.".".$type;
        if (! $form->submitted) {
            $form->field(name => "rcsinfo", value => "", force => 1);
        }
        $form->field(name => "editcontent", validate => '/.+/');
    }

    $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');
    $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());
    $form->tmpl_param("helponformattinglink",
        htmllink($page, $page, "ikiwiki/formatting",
            noimageinline => 1,
            linktext => "FormattingHelp"));
    
    if ($form->submitted eq "Cancel") {
        if ($form->field("do") eq "create" && defined $from) {
            redirect($q, "$config{url}/".htmlpage($from));
        }
        elsif ($form->field("do") eq "create") {
            redirect($q, $config{url});
        }
        else {
            redirect($q, "$config{url}/".htmlpage($page));
        }
        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->(
                content => $content,
                page => $page,
                cgi => $q,
                session => $session,
            );
        });
        my $preview=htmlize($page, $page, $type,
            linkify($page, $page,
            preprocess($page, $page,
            filter($page, $page, $content), 0, 1)));
        run_hooks(format => sub {
            $preview=shift->(
                page => $page,
                content => $preview,
            );
        });
        $form->tmpl_param("page_preview", $preview);
    
        if ($new) {
            delete $pagesources{$page};
        }
        # previewing may have created files on disk
        saveindex();
    }
    elsif ($form->submitted eq "Save Page") {
        $form->tmpl_param("page_preview", "");
    }
    
    if ($form->submitted ne "Save Page" || ! $form->validate) {
        if ($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=~/^\// || 
                $absolute ||
                $form->submitted eq "Preview") {
                @page_locs=$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 $_}
            } @page_locs;
            if (! @page_locs) {
                # hmm, someone else made the page in the
                # meantime?
                if ($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 {
                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 $hooks{htmlize}) {
                @page_types=grep { !/^_/ }
                    keys %{$hooks{htmlize}};
            }
            
            $form->tmpl_param("page_select", 1);
            $form->field(name => "page", type => 'select',
                options => [ map { [ $_, pagetitle($_, 1) ] } @editable_locs ],
                value => $best_loc);
            $form->field(name => "type", type => 'select',
                options => \@page_types);
            $form->title(sprintf(gettext("creating %s"), pagetitle($page)));
            
        }
        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)));
        }
        
        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";

        if ($form->field("do") ne "create" && ! $exists &&
            ! defined srcfile($file, 1)) {
            $form->tmpl_param("message", template("editpagegone.tmpl")->output);
            $form->field(name => "do", value => "create", 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"), $page));
            showform($form, \@buttons, $session, $q, forcebaseurl => $baseurl);
            return;
        }
        elsif ($form->field("do") eq "create" && $exists) {
            $form->tmpl_param("message", template("editcreationconflict.tmpl")->output);
            $form->field(name => "do", value => "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));
            $form->field("editcontent", 
                value => readfile("$config{srcdir}/$file").
                         "\n\n\n".$form->field("editcontent"),
                force => 1);
            showform($form, \@buttons, $session, $q, forcebaseurl => $baseurl);
            return;
        }
        
        my $content=$form->field('editcontent');
        run_hooks(editcontent => sub {
            $content=shift->(
                content => $content,
                page => $page,
                cgi => $q,
                session => $session,
            );
        });
        $content=~s/\r\n/\n/g;
        $content=~s/\r/\n/g;
        $content.="\n" if $content !~ /\n$/;

        $config{cgi}=0; # avoid cgi error message
        eval { writefile($file, $config{srcdir}, $content) };
        $config{cgi}=1;
        if ($@) {
            $form->field(name => "rcsinfo", value => rcs_prepedit($file),
                force => 1);
            my $mtemplate=template("editfailedsave.tmpl");
            $mtemplate->param(error_message => $@);
            $form->tmpl_param("message", $mtemplate->output);
            $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"), $page));
            showform($form, \@buttons, $session, $q,
                forcebaseurl => $baseurl);
            return;
        }
        
        my $conflict;
        if ($config{rcs}) {
            my $message="";
            if (defined $form->field('comments') &&
                length $form->field('comments')) {
                $message=$form->field('comments');
            }
            
            if (! $exists) {
                rcs_add($file);
            }

            # Prevent deadlock with post-commit hook by
            # signaling to it that it should not try to
            # do anything.
            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("message", template("editconflict.tmpl")->output);
            $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"), $page));
            showform($form, \@buttons, $session, $q,
                forcebaseurl => $baseurl);
            return;
        }
        else {
            # The trailing question mark tries to avoid broken
            # caches and get the most recent version of the page.
            redirect($q, "$config{url}/".htmlpage($page)."?updated");
        }
    }
} #}}}
    
sub check_banned ($$) { #{{{
    my $q=shift;
    my $session=shift;

    my $name=$session->param("name");
    if (defined $name) {
        # XXX banned in userinfo is deprecated, should be removed
        # eventually, and only banned_users be checked.
        if (userinfo_get($session->param("name"), "banned") ||
            grep { $name eq $_ } @{$config{banned_users}}) {
            print $q->header(-status => "403 Forbidden");
            $session->delete();
            print gettext("You are banned.");
            cgi_savesession($session);
            exit;
        }
    }
}

sub cgi_getsession ($) { #{{{
    my $q=shift;

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

    return $session;
} #}}}

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;

    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) {
        $session=cgi_getsession($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);
    
    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 'create' || $do eq 'edit') {
        cgi_editpage($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 $@;
} #}}}

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