path: root/ikiwiki

#!/usr/bin/perl -T

$ENV{PATH}="/usr/local/bin:/usr/bin:/bin";

package IkiWiki;
use warnings;
use strict;
use File::Spec;
use HTML::Template;
use lib '.'; # For use without installation, removed by Makefile.

use vars qw{%config %links %oldlinks %oldpagemtime %renderedfiles %pagesources};

# Holds global config settings, also used by some modules.
our %config=( #{{{
    wiki_file_prune_regexp => qr{((^|/).svn/|\.\.|^\.|\/\.|\.html?$)},
    wiki_link_regexp => qr/\[\[([^\s\]]+)\]\]/,
    wiki_file_regexp => qr/(^[-A-Za-z0-9_.:\/+]+$)/,
    verbose => 0,
    wikiname => "wiki",
    default_pageext => ".mdwn",
    cgi => 0,
    svn => 1,
    url => '',
    cgiurl => '',
    historyurl => '',
    diffurl => '',
    anonok => 0,
    rebuild => 0,
    wrapper => undef,
    wrappermode => undef,
    srcdir => undef,
    destdir => undef,
    templatedir => "/usr/share/ikiwiki/templates",
    setup => undef,
    adminuser => undef,
); #}}}

sub getconfig () { #{{{
    if (! exists $ENV{WRAPPED_OPTIONS}) {
        eval q{use Getopt::Long};
        GetOptions(
            "setup|s=s" => \$config{setup},
            "wikiname=s" => \$config{wikiname},
            "verbose|v!" => \$config{verbose},
            "rebuild!" => \$config{rebuild},
            "wrappermode=i" => \$config{wrappermode},
            "svn!" => \$config{svn},
            "anonok!" => \$config{anonok},
            "cgi!" => \$config{cgi},
            "url=s" => \$config{url},
            "cgiurl=s" => \$config{cgiurl},
            "historyurl=s" => \$config{historyurl},
            "diffurl=s" => \$config{diffurl},
            "exclude=s@" => sub {
                $config{wiki_file_prune_regexp}=qr/$config{wiki_file_prune_regexp}|$_[1]/;
            },
            "adminuser=s@" => sub {
                push @{$config{adminuser}}, $_[1]
            },
            "templatedir=s" => sub {
                $config{templatedir}=possibly_foolish_untaint($_[1])
            },
            "wrapper:s" => sub {
                $config{wrapper}=$_[1] ? $_[1] : "ikiwiki-wrap"
            },
        ) || usage();

        if (! $config{setup}) {
            usage() unless @ARGV == 2;
            $config{srcdir} = possibly_foolish_untaint(shift);
            $config{destdir} = possibly_foolish_untaint(shift);
            checkconfig();
        }
    }
    else {
        # wrapper passes a full config structure in the environment
        # variable
        eval possibly_foolish_untaint($ENV{WRAPPED_OPTIONS});
        checkconfig();
    }
} #}}}

sub checkconfig () { #{{{
    if ($config{cgi} && ! length $config{url}) {
        error("Must specify url to wiki with --url when using --cgi");
    }
    
    $config{wikistatedir}="$config{srcdir}/.ikiwiki"
        unless exists $config{wikistatedir};
    
    if ($config{svn}) {
        require IkiWiki::RCS::SVN;
        $config{rcs}=1;
    }
    else {
        require IkiWiki::RCS::Stub;
        $config{rcs}=0;
    }
} #}}}

sub error ($) { #{{{
    if ($config{cgi}) {
        print "Content-type: text/html\n\n";
        print misctemplate("Error", "<p>Error: @_</p>");
    }
    die @_;
} #}}}

sub usage () { #{{{
    die "usage: ikiwiki [options] source dest\n";
} #}}}

sub possibly_foolish_untaint ($) { #{{{
    my $tainted=shift;
    my ($untainted)=$tainted=~/(.*)/;
    return $untainted;
} #}}}

sub debug ($) { #{{{
    return unless $config{verbose};
    if (! $config{cgi}) {
        print "@_\n";
    }
    else {
        print STDERR "@_\n";
    }
} #}}}

sub basename ($) { #{{{
    my $file=shift;

    $file=~s!.*/!!;
    return $file;
} #}}}

sub dirname ($) { #{{{
    my $file=shift;

    $file=~s!/?[^/]+$!!;
    return $file;
} #}}}

sub pagetype ($) { #{{{
    my $page=shift;
    
    if ($page =~ /\.mdwn$/) {
        return ".mdwn";
    }
    else {
        return "unknown";
    }
} #}}}

sub pagename ($) { #{{{
    my $file=shift;

    my $type=pagetype($file);
    my $page=$file;
    $page=~s/\Q$type\E*$// unless $type eq 'unknown';
    return $page;
} #}}}

sub htmlpage ($) { #{{{
    my $page=shift;

    return $page.".html";
} #}}}

sub readfile ($) { #{{{
    my $file=shift;

    if (-l $file) {
        error("cannot read a symlink ($file)");
    }
    
    local $/=undef;
    open (IN, "$file") || error("failed to read $file: $!");
    my $ret=<IN>;
    close IN;
    return $ret;
} #}}}

sub writefile ($$) { #{{{
    my $file=shift;
    my $content=shift;
    
    if (-l $file) {
        error("cannot write to a symlink ($file)");
    }

    my $dir=dirname($file);
    if (! -d $dir) {
        my $d="";
        foreach my $s (split(m!/+!, $dir)) {
            $d.="$s/";
            if (! -d $d) {
                mkdir($d) || error("failed to create directory $d: $!");
            }
        }
    }
    
    open (OUT, ">$file") || error("failed to write $file: $!");
    print OUT $content;
    close OUT;
} #}}}

sub bestlink ($$) { #{{{
    # Given a page and the text of a link on the page, determine which
    # existing page that link best points to. Prefers pages under a
    # subdirectory with the same name as the source page, failing that
    # goes down the directory tree to the base looking for matching
    # pages.
    my $page=shift;
    my $link=lc(shift);
    
    my $cwd=$page;
    do {
        my $l=$cwd;
        $l.="/" if length $l;
        $l.=$link;

        if (exists $links{$l}) {
            #debug("for $page, \"$link\", use $l");
            return $l;
        }
    } while $cwd=~s!/?[^/]+$!!;

    #print STDERR "warning: page $page, broken link: $link\n";
    return "";
} #}}}

sub isinlinableimage ($) { #{{{
    my $file=shift;
    
    $file=~/\.(png|gif|jpg|jpeg)$/;
} #}}}

sub htmllink ($$;$$) { #{{{
    my $page=shift;
    my $link=shift;
    my $noimageinline=shift; # don't turn links into inline html images
    my $forcesubpage=shift; # force a link to a subpage

    my $bestlink;
    if (! $forcesubpage) {
        $bestlink=bestlink($page, $link);
    }
    else {
        $bestlink="$page/".lc($link);
    }

    return $link if length $bestlink && $page eq $bestlink;
    
    # TODO BUG: %renderedfiles may not have it, if the linked to page
    # was also added and isn't yet rendered! Note that this bug is
    # masked by the bug mentioned below that makes all new files
    # be rendered twice.
    if (! grep { $_ eq $bestlink } values %renderedfiles) {
        $bestlink=htmlpage($bestlink);
    }
    if (! grep { $_ eq $bestlink } values %renderedfiles) {
        return "<a href=\"$config{cgiurl}?do=create&page=$link&from=$page\">?</a>$link"
    }
    
    $bestlink=File::Spec->abs2rel($bestlink, dirname($page));
    
    if (! $noimageinline && isinlinableimage($bestlink)) {
        return "<img src=\"$bestlink\">";
    }
    return "<a href=\"$bestlink\">$link</a>";
} #}}}

sub indexlink () { #{{{
    return "<a href=\"$config{url}\">$config{wikiname}</a>";
} #}}}

sub lockwiki () { #{{{
    # Take an exclusive lock on the wiki to prevent multiple concurrent
    # run issues. The lock will be dropped on program exit.
    if (! -d $config{wikistatedir}) {
        mkdir($config{wikistatedir});
    }
    open(WIKILOCK, ">$config{wikistatedir}/lockfile") ||
        error ("cannot write to $config{wikistatedir}/lockfile: $!");
    if (! flock(WIKILOCK, 2 | 4)) {
        debug("wiki seems to be locked, waiting for lock");
        my $wait=600; # arbitrary, but don't hang forever to 
                      # prevent process pileup
        for (1..600) {
            return if flock(WIKILOCK, 2 | 4);
            sleep 1;
        }
        error("wiki is locked; waited $wait seconds without lock being freed (possible stuck process or stale lock?)");
    }
} #}}}

sub unlockwiki () { #{{{
    close WIKILOCK;
} #}}}

sub loadindex () { #{{{
    open (IN, "$config{wikistatedir}/index") || return;
    while (<IN>) {
        $_=possibly_foolish_untaint($_);
        chomp;
        my ($mtime, $file, $rendered, @links)=split(' ', $_);
        my $page=pagename($file);
        $pagesources{$page}=$file;
        $oldpagemtime{$page}=$mtime;
        $oldlinks{$page}=[@links];
        $links{$page}=[@links];
        $renderedfiles{$page}=$rendered;
    }
    close IN;
} #}}}

sub saveindex () { #{{{
    if (! -d $config{wikistatedir}) {
        mkdir($config{wikistatedir});
    }
    open (OUT, ">$config{wikistatedir}/index") || 
        error("cannot write to $config{wikistatedir}/index: $!");
    foreach my $page (keys %oldpagemtime) {
        print OUT "$oldpagemtime{$page} $pagesources{$page} $renderedfiles{$page} ".
                join(" ", @{$links{$page}})."\n"
                if $oldpagemtime{$page};
    }
    close OUT;
} #}}}

sub misctemplate ($$) { #{{{
    my $title=shift;
    my $pagebody=shift;
    
    my $template=HTML::Template->new(
        filename => "$config{templatedir}/misc.tmpl"
    );
    $template->param(
        title => $title,
        indexlink => indexlink(),
        wikiname => $config{wikiname},
        pagebody => $pagebody,
    );
    return $template->output;
}#}}}

sub userinfo_get ($$) { #{{{
    my $user=shift;
    my $field=shift;

    eval q{use Storable};
    my $userdata=eval{ Storable::lock_retrieve("$config{wikistatedir}/userdb") };
    if (! defined $userdata || ! ref $userdata || 
        ! exists $userdata->{$user} || ! ref $userdata->{$user} ||
            ! exists $userdata->{$user}->{$field}) {
        return "";
    }
    return $userdata->{$user}->{$field};
} #}}}

sub userinfo_set ($$$) { #{{{
    my $user=shift;
    my $field=shift;
    my $value=shift;
    
    eval q{use Storable};
    my $userdata=eval{ Storable::lock_retrieve("$config{wikistatedir}/userdb") };
    if (! defined $userdata || ! ref $userdata || 
        ! exists $userdata->{$user} || ! ref $userdata->{$user}) {
        return "";
    }
    
    $userdata->{$user}->{$field}=$value;
    my $oldmask=umask(077);
    my $ret=Storable::lock_store($userdata, "$config{wikistatedir}/userdb");
    umask($oldmask);
    return $ret;
} #}}}

sub userinfo_setall ($$) { #{{{
    my $user=shift;
    my $info=shift;
    
    eval q{use Storable};
    my $userdata=eval{ Storable::lock_retrieve("$config{wikistatedir}/userdb") };
    if (! defined $userdata || ! ref $userdata) {
        $userdata={};
    }
    $userdata->{$user}=$info;
    my $oldmask=umask(077);
    my $ret=Storable::lock_store($userdata, "$config{wikistatedir}/userdb");
    umask($oldmask);
    return $ret;
} #}}}

sub is_admin ($) { #{{{
    my $user_name=shift;

    return grep { $_ eq $user_name } @{$config{adminuser}};
} #}}}

sub glob_match ($$) { #{{{
    my $page=shift;
    my $glob=shift;

    # turn glob into safe regexp
    $glob=quotemeta($glob);
    $glob=~s/\\\*/.*/g;
    $glob=~s/\\\?/./g;
    $glob=~s!\\/!/!g;
    
    $page=~/^$glob$/i;
} #}}}

sub globlist_match ($$) { #{{{
    my $page=shift;
    my @globlist=split(" ", shift);

    # check any negated globs first
    foreach my $glob (@globlist) {
        return 0 if $glob=~/^!(.*)/ && glob_match($page, $1);
    }

    foreach my $glob (@globlist) {
        return 1 if glob_match($page, $glob);
    }
    
    return 0;
} #}}}

sub main () { #{{{
    getconfig();
    
    if ($config{setup}) {
        require IkiWiki::Setup;
        setup();
    }
    elsif ($config{wrapper}) {
        lockwiki();
        require IkiWiki::Wrapper;
        gen_wrapper();
    }
    elsif ($config{cgi}) {
        lockwiki();
        require IkiWiki::CGI;
        cgi();
    }
    else {
        lockwiki();
        loadindex() unless $config{rebuild};
        require IkiWiki::Render;
        rcs_update();
        refresh();
        saveindex();
    }
} #}}}

main;