path: root/IkiWiki/Plugin/attachment.pm

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

use warnings;
use strict;
use IkiWiki 2.00;

sub import { #{{{
    hook(type => "getsetup", id => "attachment", call => \&getsetup);
    hook(type => "checkconfig", id => "attachment", call => \&checkconfig);
    hook(type => "formbuilder_setup", id => "attachment", call => \&formbuilder_setup);
    hook(type => "formbuilder", id => "attachment", call => \&formbuilder);
} # }}}

sub getsetup () { #{{{
    return
        plugin => {
            safe => 1,
            rebuild => 0,
        },
        allowed_attachments => {
            type => "pagespec",
            example => "virusfree() and mimetype(image/*) and maxsize(50kb)",
            description => "enhanced PageSpec specifying what attachments are allowed",
            link => "ikiwiki/PageSpec/attachment",
            safe => 1,
            rebuild => 0,
        },
        virus_checker => {
            type => "string",
            example => "clamdscan -",
            description => "virus checker program (reads STDIN, returns nonzero if virus found)",
            safe => 0, # executed
            rebuild => 0,
        },
} #}}}

sub check_canattach ($$;$) { #{{{
    my $session=shift;
    my $dest=shift; # where it's going to be put, under the srcdir
    my $file=shift; # the path to the attachment currently

    # Don't allow an attachment to be uploaded with the same name as an
    # existing page.
    if (exists $pagesources{$dest} && $pagesources{$dest} ne $dest) {
        error(sprintf(gettext("there is already a page named %s"), $dest));
    }

    # Use a special pagespec to test that the attachment is valid.
    my $allowed=1;
    if (defined $config{allowed_attachments} &&
        length $config{allowed_attachments}) {
        $allowed=pagespec_match($dest,
            $config{allowed_attachments},
            file => $file,
            user => $session->param("name"),
            ip => $ENV{REMOTE_ADDR},
        );
    }

    # XXX deprecated, should be removed eventually
    if ($allowed) {
        foreach my $admin (@{$config{adminuser}}) {
            my $allowed_attachments=IkiWiki::userinfo_get($admin, "allowed_attachments");
            if (defined $allowed_attachments &&
                length $allowed_attachments) {
                $allowed=pagespec_match($dest,
                    $allowed_attachments,
                    file => $file,
                    user => $session->param("name"),
                    ip => $ENV{REMOTE_ADDR},
                );
                last if $allowed;
            }
        }
    }

    if (! $allowed) {
        error(gettext("prohibited by allowed_attachments")." ($allowed)");
    }
    else {
        return 1;
    }
} #}}}

sub checkconfig () { #{{{
    $config{cgi_disable_uploads}=0;
} #}}}

sub formbuilder_setup (@) { #{{{
    my %params=@_;
    my $form=$params{form};
    my $q=$params{cgi};

    if (defined $form->field("do") && $form->field("do") eq "edit") {
        # Add attachment field, set type to multipart.
        $form->enctype(&CGI::MULTIPART);
        $form->field(name => 'attachment', type => 'file');
        # These buttons are not put in the usual place, so
        # are not added to the normal formbuilder button list.
        $form->tmpl_param("field-upload" => '<input name="_submit" type="submit" value="Upload Attachment" />');
        $form->tmpl_param("field-link" => '<input name="_submit" type="submit" value="Insert Links" />');

        # Add the javascript from the toggle plugin;
        # the attachments interface uses it to toggle visibility.
        require IkiWiki::Plugin::toggle;
        $form->tmpl_param("javascript" => $IkiWiki::Plugin::toggle::javascript);
        # Start with the attachments interface toggled invisible,
        # but if it was used, keep it open.
        if ($form->submitted ne "Upload Attachment" &&
            (! defined $q->param("attachment_select") ||
            ! length $q->param("attachment_select"))) {
            $form->tmpl_param("attachments-class" => "toggleable");
        }
        else {
            $form->tmpl_param("attachments-class" => "toggleable-open");
        }
    }
    elsif ($form->title eq "preferences") {
        # XXX deprecated, should remove eventually
        my $session=$params{session};
        my $user_name=$session->param("name");

        $form->field(name => "allowed_attachments", size => 50,
            fieldset => "admin",
            comment => "deprecated; please move to allowed_attachments in setup file",
        );
        if (! IkiWiki::is_admin($user_name)) {
            $form->field(name => "allowed_attachments", type => "hidden");
        }
                if (! $form->submitted) {
            my $value=IkiWiki::userinfo_get($user_name, "allowed_attachments");
            if (length $value) {
                $form->field(name => "allowed_attachments", force => 1,
                    value => IkiWiki::userinfo_get($user_name, "allowed_attachments"));
            }
            else {
                $form->field(name => "allowed_attachments", type => "hidden");
            }
                }
        if ($form->submitted && $form->submitted eq 'Save Preferences') {
            if (defined $form->field("allowed_attachments")) {
                IkiWiki::userinfo_set($user_name, "allowed_attachments",
                $form->field("allowed_attachments")) ||
                    error("failed to set allowed_attachments");
                if (length $form->field("allowed_attachments")) {
                    $form->field(name => "allowed_attachments", type => "hidden");
                }
            }
        }
    }
} #}}}

sub formbuilder (@) { #{{{
    my %params=@_;
    my $form=$params{form};
    my $q=$params{cgi};

    return if ! defined $form->field("do") || $form->field("do") ne "edit";

    my $filename=$q->param('attachment');
    if (defined $filename && length $filename &&
            ($form->submitted eq "Upload Attachment" || $form->submitted eq "Save Page")) {
        my $session=$params{session};
        
        # This is an (apparently undocumented) way to get the name
        # of the temp file that CGI writes the upload to.
        my $tempfile=$q->tmpFileName($filename);
        if (! defined $tempfile || ! length $tempfile) {
            # perl 5.8 needs an alternative, awful method
            if ($q =~ /HASH/ && exists $q->{'.tmpfiles'}) {
                foreach my $key (keys(%{$q->{'.tmpfiles'}})) {
                    $tempfile=$q->tmpFileName(\$key);
                    last if defined $tempfile && length $tempfile;
                }
            }
            if (! defined $tempfile || ! length $tempfile) {
                error("CGI::tmpFileName failed to return the uploaded file name");
            }
        }

        $filename=IkiWiki::linkpage(
            IkiWiki::possibly_foolish_untaint(
                attachment_location($form->field('page')).
                IkiWiki::basename($filename)));
        if (IkiWiki::file_pruned($filename, $config{srcdir})) {
            error(gettext("bad attachment filename"));
        }
        
        # Check that the user is allowed to edit a page with the
        # name of the attachment.
        IkiWiki::check_canedit($filename, $q, $session, 1);
        # And that the attachment itself is acceptable.
        check_canattach($session, $filename, $tempfile);

        # Needed for fast_file_copy and for rendering below.
        require IkiWiki::Render;

        # Move the attachment into place.
        # Try to use a fast rename; fall back to copying.
        IkiWiki::prep_writefile($filename, $config{srcdir});
        unlink($config{srcdir}."/".$filename);
        if (rename($tempfile, $config{srcdir}."/".$filename)) {
            # The temp file has tight permissions; loosen up.
            chmod(0666 & ~umask, $config{srcdir}."/".$filename);
        }
        else {
            my $fh=$q->upload('attachment');
            if (! defined $fh || ! ref $fh) {
                # needed by old CGI versions
                $fh=$q->param('attachment');
                if (! defined $fh || ! ref $fh) {
                    # even that doesn't always work,
                    # fall back to opening the tempfile
                    $fh=undef;
                    open($fh, "<", $tempfile) || error("failed to open \"$tempfile\": $!");
                }
            }
            binmode($fh);
            writefile($filename, $config{srcdir}, undef, 1, sub {
                IkiWiki::fast_file_copy($tempfile, $filename, $fh, @_);
            });
        }

        # Check the attachment in and trigger a wiki refresh.
        if ($config{rcs}) {
            IkiWiki::rcs_add($filename);
            IkiWiki::disable_commit_hook();
            IkiWiki::rcs_commit($filename, gettext("attachment upload"),
                IkiWiki::rcs_prepedit($filename),
                $session->param("name"), $ENV{REMOTE_ADDR});
            IkiWiki::enable_commit_hook();
            IkiWiki::rcs_update();
        }
        IkiWiki::refresh();
        IkiWiki::saveindex();
    }
    elsif ($form->submitted eq "Insert Links") {
        my $page=quotemeta($q->param("page"));
        my $add="";
        foreach my $f ($q->param("attachment_select")) {
            $f=~s/^$page\///;
            $add.="[[$f]]\n";
        }
        $form->field(name => 'editcontent',
            value => $form->field('editcontent')."\n\n".$add,
            force => 1) if length $add;
    }
    
    # Generate the attachment list only after having added any new
    # attachments.
    $form->tmpl_param("attachment_list" => [attachment_list($form->field('page'))]);
} # }}}

sub attachment_location ($) { #{{{
    my $page=shift;
    
    # Put the attachment in a subdir of the page it's attached
    # to, unless that page is an "index" page.
    $page=~s/(^|\/)index//;
    $page.="/" if length $page;
    
    return $page;
} #}}}

sub attachment_list ($) { #{{{
    my $page=shift;
    my $loc=attachment_location($page);

    my @ret;
    foreach my $f (values %pagesources) {
        if (! defined IkiWiki::pagetype($f) &&
            $f=~m/^\Q$loc\E[^\/]+$/ &&
            -e "$config{srcdir}/$f") {
            push @ret, {
                "field-select" => '<input type="checkbox" name="attachment_select" value="'.$f.'" />',
                link => htmllink($page, $page, $f, noimageinline => 1),
                size => humansize((stat(_))[7]),
                mtime => displaytime($IkiWiki::pagemtime{$f}),
                mtime_raw => $IkiWiki::pagemtime{$f},
            };
        }
    }

    # Sort newer attachments to the top of the list, so a newly-added
    # attachment appears just before the form used to add it.
    return sort { $b->{mtime_raw} <=> $a->{mtime_raw} || $a->{link} cmp $b->{link} } @ret;
} #}}}

my %units=( #{{{    # size in bytes
    B       => 1,
    byte        => 1,
    KB      => 2 ** 10,
    kilobyte    => 2 ** 10,
    K       => 2 ** 10,
    KB      => 2 ** 10,
    kilobyte    => 2 ** 10,
    M       => 2 ** 20,
    MB      => 2 ** 20,
    megabyte    => 2 ** 20,
    G       => 2 ** 30,
    GB      => 2 ** 30,
    gigabyte    => 2 ** 30,
    T       => 2 ** 40,
    TB      => 2 ** 40,
    terabyte    => 2 ** 40,
    P       => 2 ** 50,
    PB      => 2 ** 50,
    petabyte    => 2 ** 50,
    E       => 2 ** 60,
    EB      => 2 ** 60,
    exabyte     => 2 ** 60,
    Z       => 2 ** 70,
    ZB      => 2 ** 70,
    zettabyte   => 2 ** 70,
    Y       => 2 ** 80,
    YB      => 2 ** 80,
    yottabyte   => 2 ** 80,
    # ikiwiki, if you find you need larger data quantities, either modify
    # yourself to add them, or travel back in time to 2008 and kill me.
    #   -- Joey
); #}}}

sub parsesize ($) { #{{{
    my $size=shift;

    no warnings;
    my $base=$size+0; # force to number
    use warnings;
    foreach my $unit (sort keys %units) {
        if ($size=~/[0-9\s]\Q$unit\E$/i) {
            return $base * $units{$unit};
        }
    }
    return $base;
} #}}}

sub humansize ($) { #{{{
    my $size=shift;

    foreach my $unit (reverse sort { $units{$a} <=> $units{$b} || $b cmp $a } keys %units) {
        if ($size / $units{$unit} > 0.25) {
            return (int($size / $units{$unit} * 10)/10).$unit;
        }
    }
    return $size; # near zero, or negative
} #}}}

package IkiWiki::PageSpec;

sub match_maxsize ($$;@) { #{{{
    shift;
    my $maxsize=eval{IkiWiki::Plugin::attachment::parsesize(shift)};
    if ($@) {
        return IkiWiki::FailReason->new("unable to parse maxsize (or number too large)");
    }

    my %params=@_;
    if (! exists $params{file}) {
        return IkiWiki::FailReason->new("no file specified");
    }

    if (-s $params{file} > $maxsize) {
        return IkiWiki::FailReason->new("file too large (".(-s $params{file})." >  $maxsize)");
    }
    else {
        return IkiWiki::SuccessReason->new("file not too large");
    }
} #}}}

sub match_minsize ($$;@) { #{{{
    shift;
    my $minsize=eval{IkiWiki::Plugin::attachment::parsesize(shift)};
    if ($@) {
        return IkiWiki::FailReason->new("unable to parse minsize (or number too large)");
    }

    my %params=@_;
    if (! exists $params{file}) {
        return IkiWiki::FailReason->new("no file specified");
    }

    if (-s $params{file} < $minsize) {
        return IkiWiki::FailReason->new("file too small");
    }
    else {
        return IkiWiki::SuccessReason->new("file not too small");
    }
} #}}}

sub match_mimetype ($$;@) { #{{{
    shift;
    my $wanted=shift;

    my %params=@_;
    if (! exists $params{file}) {
        return IkiWiki::FailReason->new("no file specified");
    }

    # Use ::magic to get the mime type, the idea is to only trust
    # data obtained by examining the actual file contents.
    eval q{use File::MimeInfo::Magic};
    if ($@) {
        return IkiWiki::FailReason->new("failed to load File::MimeInfo::Magic ($@); cannot check MIME type");
    }
    my $mimetype=File::MimeInfo::Magic::magic($params{file});
    if (! defined $mimetype) {
        $mimetype="unknown";
    }

    my $regexp=IkiWiki::glob2re($wanted);
    if ($mimetype!~/^$regexp$/i) {
        return IkiWiki::FailReason->new("file MIME type is $mimetype, not $wanted");
    }
    else {
        return IkiWiki::SuccessReason->new("file MIME type is $mimetype");
    }
} #}}}

sub match_virusfree ($$;@) { #{{{
    shift;
    my $wanted=shift;

    my %params=@_;
    if (! exists $params{file}) {
        return IkiWiki::FailReason->new("no file specified");
    }

    if (! exists $IkiWiki::config{virus_checker} ||
        ! length $IkiWiki::config{virus_checker}) {
        return IkiWiki::FailReason->new("no virus_checker configured");
    }

    # The file needs to be fed into the virus checker on stdin,
    # because the file is not world-readable, and if clamdscan is
    # used, clamd would fail to read it.
    eval q{use IPC::Open2};
    error($@) if $@;
    open (IN, "<", $params{file}) || return IkiWiki::FailReason->new("failed to read file");
    binmode(IN);
    my $sigpipe=0;
    $SIG{PIPE} = sub { $sigpipe=1 };
    my $pid=open2(\*CHECKER_OUT, "<&IN", $IkiWiki::config{virus_checker}); 
    my $reason=<CHECKER_OUT>;
    chomp $reason;
    1 while (<CHECKER_OUT>);
    close(CHECKER_OUT);
    waitpid $pid, 0;
    $SIG{PIPE}="DEFAULT";
    if ($sigpipe || $?) {
        if (! length $reason) {
            $reason="virus checker $IkiWiki::config{virus_checker}; failed with no output";
        }
        return IkiWiki::FailReason->new("file seems to contain a virus ($reason)");
    }
    else {
        return IkiWiki::SuccessReason->new("file seems virusfree ($reason)");
    }
} #}}}

sub match_ispage ($$;@) { #{{{
    my $filename=shift;

    if (defined IkiWiki::pagetype($filename)) {
        return IkiWiki::SuccessReason->new("file is a wiki page");
    }
    else {
        return IkiWiki::FailReason->new("file is not a wiki page");
    }
} #}}}

sub match_user ($$;@) { #{{{
    shift;
    my $user=shift;
    my %params=@_;
    
    if (! exists $params{user}) {
        return IkiWiki::FailReason->new("no user specified");
    }

    if (defined $params{user} && lc $params{user} eq lc $user) {
        return IkiWiki::SuccessReason->new("user is $user");
    }
    elsif (! defined $params{user}) {
        return IkiWiki::FailReason->new("not logged in");
    }
    else {
        return IkiWiki::FailReason->new("user is $params{user}, not $user");
    }
} #}}}

sub match_ip ($$;@) { #{{{
    shift;
    my $ip=shift;
    my %params=@_;
    
    if (! exists $params{ip}) {
        return IkiWiki::FailReason->new("no IP specified");
    }

    if (defined $params{ip} && lc $params{ip} eq lc $ip) {
        return IkiWiki::SuccessReason->new("IP is $ip");
    }
    else {
        return IkiWiki::FailReason->new("IP is $params{ip}, not $ip");
    }
} #}}}

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