IkiWiki/Plugin/editpage.pm



#!/usr/bin/perl
package IkiWiki::Plugin::editpage;

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

sub import { #{{{
    hook(type => "getsetup", id => "editpage", call => \&getsetup);
    hook(type => "refresh", id => "editpage", call => \&refresh);
        hook(type => "sessioncgi", id => "editpage", call => \&IkiWiki::cgi_editpage);
} # }}}

sub getsetup () { #{{{
    return
        plugin => {
            safe => 1,
            rebuild => 1,
        },
} #}}}

sub refresh () {
    if (exists $wikistate{editpage} && exists $wikistate{editpage}{previews}) {
        # Expire old preview files after one hour.
        my $expire=time - (60 * 60);

        my @previews;
        foreach my $file (@{$wikistate{editpage}{previews}}) {
            my $mtime=(stat("$config{destdir}/$file"))[9];
            if (defined $mtime && $mtime <= $expire) {
                # Avoid deleting a preview that was later saved.
                my $delete=1;
                foreach my $page (keys %renderedfiles) {
                    if (grep { $_ eq $file } @{$renderedfiles{$page}}) {
                        $delete=0;
                    }
                }
                if ($delete) {
                    debug(sprintf(gettext("removing old preview %s"), $file));
                    IkiWiki::prune("$config{destdir}/$file");
                }
            }
            elsif (defined $mtime) {
                push @previews, $file;
            }
        }
        $wikistate{editpage}{previews}=\@previews;
    }
}

# Back to ikiwiki namespace for the rest, this code is very much
# internal to ikiwiki even though it's separated into a plugin,
# and other plugins use the functions below.
package IkiWiki;

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 cgi_editpage ($$) { #{{{
    my $q=shift;
    my $session=shift;
    
        my $do=$q->param('do');
    return unless $do eq 'create' || $do eq 'edit';

    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 and
    # wiki_file_regexp.
    my ($page)=$form->field('page')=~/$config{wiki_file_regexp}/;
    $page=possibly_foolish_untaint($page);
    my $absolute=($page =~ s#^/+##);
    if (! defined $page || ! length $page ||
        file_pruned($page, $config{srcdir})) {
        error(gettext("bad page name"));
    }

    my $baseurl = urlto($page, undef, 1);

    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;
        $file=newpagefile($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, urlto($from, undef, 1));
        }
        elsif ($form->field("do") eq "create") {
            redirect($q, $config{url});
        }
        else {
            redirect($q, urlto($page, undef, 1));
        }
        exit;
    }
    elsif ($form->submitted eq "Preview") {
        my $new=not exists $pagesources{$page};
        if ($new) {
            # temporarily record its type
            $pagesources{$page}=$page.".".$type;
        }
        my %wasrendered=map { $_ => 1 } @{$renderedfiles{$page}};

        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.
        # Keep a list of these to be deleted later.
        my %previews = map { $_ => 1 } @{$wikistate{editpage}{previews}};
        foreach my $f (@{$renderedfiles{$page}}) {
            $previews{$f}=1 unless $wasrendered{$f};
        }
        @{$wikistate{editpage}{previews}} = keys %previews;
        $renderedfiles{$page}=[keys %wasrendered];
        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 ||
                $form->submitted) {
                @page_locs=$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, urlto($page, undef, 1));
                    exit;
                }
            }

            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, $session);
        checksessionexpiry($session, $q->param('sid'));

        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 => $baseurl);
            exit;
        }
        elsif ($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);
            exit;
        }
        
        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);
            exit;
        }
        
        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 => $baseurl);
        }
        else {
            # The trailing question mark tries to avoid broken
            # caches and get the most recent version of the page.
            redirect($q, urlto($page, undef, 1)."?updated");
        }
    }

    exit;
} #}}}

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