IkiWiki/Plugin/attachment.pm

   1 #!/usr/bin/perl
   2 package IkiWiki::Plugin::attachment;
   3
   4 use warnings;
   5 use strict;
   6 use IkiWiki 2.00;
   7
   8 sub import { #{{{
   9         hook(type => "getsetup", id => "attachment", call => \&getsetup);
  10         hook(type => "checkconfig", id => "attachment", call => \&checkconfig);
  11         hook(type => "formbuilder_setup", id => "attachment", call => \&formbuilder_setup);
  12         hook(type => "formbuilder", id => "attachment", call => \&formbuilder);
  13 } # }}}
  14
  15 sub getsetup () { #{{{
  16         return
  17                  => {
  18                         type => "string",
  19                         default => "",
  20                         example => "clamdscan -",
  21                         description => "virus checker program (reads STDIN, returns nonzero if virus found)",
  22                         safe => 0, # executed
  23                         rebuild => 0,
  24                 },
  25 } #}}}
  26
  27 sub check_canattach ($$;$) { #{{{
  28         my $session=shift;
  29         my $dest=shift; # where it's going to be put, under the srcdir
  30         my $file=shift; # the path to the attachment currently
  31
  32         # Don't allow an attachment to be uploaded with the same name as an
  33         # existing page.
  34         if (exists $pagesources{$dest} && $pagesources{$dest} ne $dest) {
  35                 error(sprintf(gettext("there is already a page named %s"), $dest));
  36         }
  37
  38         # Use a special pagespec to test that the attachment is valid.
  39         my $allowed=1;
  40         foreach my $admin (@{$config{adminuser}}) {
  41                 my $allowed_attachments=IkiWiki::userinfo_get($admin, "allowed_attachments");
  42                 if (defined $allowed_attachments &&
  43                     length $allowed_attachments) {
  44                         $allowed=pagespec_match($dest,
  45                                 $allowed_attachments,
  46                                 file => $file,
  47                                 user => $session->param("name"),
  48                                 ip => $ENV{REMOTE_ADDR},
  49                         );
  50                         last if $allowed;
  51                 }
  52         }
  53         if (! $allowed) {
  54                 error(gettext("prohibited by allowed_attachments")." ($allowed)");
  55         }
  56         else {
  57                 return 1;
  58         }
  59 } #}}}
  60
  61 sub checkconfig () { #{{{
  62         $config{cgi_disable_uploads}=0;
  63 } #}}}
  64
  65 sub formbuilder_setup (@) { #{{{
  66         my %params=@_;
  67         my $form=$params{form};
  68         my $q=$params{cgi};
  69
  70         if (defined $form->field("do") && $form->field("do") eq "edit") {
  71                 # Add attachment field, set type to multipart.
  72                 $form->enctype(&CGI::MULTIPART);
  73                 $form->field(name => 'attachment', type => 'file');
  74                 # These buttons are not put in the usual place, so
  75                 # are not added to the normal formbuilder button list.
  76                 $form->tmpl_param("field-upload" => '<input name="_submit" type="submit" value="Upload Attachment" />');
  77                 $form->tmpl_param("field-link" => '<input name="_submit" type="submit" value="Insert Links" />');
  78
  79                 # Add the javascript from the toggle plugin;
  80                 # the attachments interface uses it to toggle visibility.
  81                 require IkiWiki::Plugin::toggle;
  82                 $form->tmpl_param("javascript" => $IkiWiki::Plugin::toggle::javascript);
  83                 # Start with the attachments interface toggled invisible,
  84                 # but if it was used, keep it open.
  85                 if ($form->submitted ne "Upload Attachment" &&
  86                     (! defined $q->param("attachment_select") ||
  87                     ! length $q->param("attachment_select"))) {
  88                         $form->tmpl_param("attachments-class" => "toggleable");
  89                 }
  90                 else {
  91                         $form->tmpl_param("attachments-class" => "toggleable-open");
  92                 }
  93         }
  94         elsif ($form->title eq "preferences") {
  95                 my $session=$params{session};
  96                 my $user_name=$session->param("name");
  97
  98                 $form->field(name => "allowed_attachments", size => 50,
  99                         fieldset => "admin",
 100                         comment => "(".
 101                                 htmllink("", "",
 102                                         "ikiwiki/PageSpec/attachment",
 103                                         noimageinline => 1,
 104                                         linktext => "Enhanced PageSpec",
 105                                 ).")"
 106                 );
 107                 if (! IkiWiki::is_admin($user_name)) {
 108                         $form->field(name => "allowed_attachments", type => "hidden");
 109                 }
 110                 if (! $form->submitted) {
 111                         $form->field(name => "allowed_attachments", force => 1,
 112                                 value => IkiWiki::userinfo_get($user_name, "allowed_attachments"));
 113                 }
 114                 if ($form->submitted && $form->submitted eq 'Save Preferences') {
 115                         if (defined $form->field("allowed_attachments")) {
 116                                 IkiWiki::userinfo_set($user_name, "allowed_attachments",
 117                                 $form->field("allowed_attachments")) ||
 118                                         error("failed to set allowed_attachments");
 119                         }
 120                 }
 121         }
 122 } #}}}
 123
 124 sub formbuilder (@) { #{{{
 125         my %params=@_;
 126         my $form=$params{form};
 127         my $q=$params{cgi};
 128
 129         return if ! defined $form->field("do") || $form->field("do") ne "edit";
 130
 131         my $filename=$q->param('attachment');
 132         if (defined $filename && length $filename &&
 133             ($form->submitted eq "Upload Attachment" || $form->submitted eq "Save Page")) {
 134                 my $session=$params{session};
 135
 136                 # This is an (apparently undocumented) way to get the name
 137                 # of the temp file that CGI writes the upload to.
 138                 my $tempfile=$q->tmpFileName($filename);
 139                 if (! defined $tempfile || ! length $tempfile) {
 140                         # perl 5.8 needs an alternative, awful method
 141                         if ($q =~ /HASH/ && exists $q->{'.tmpfiles'}) {
 142                                 foreach my $key (keys(%{$q->{'.tmpfiles'}})) {
 143                                         $tempfile=$q->tmpFileName(\$key);
 144                                         last if defined $tempfile && length $tempfile;
 145                                 }
 146                         }
 147                         if (! defined $tempfile || ! length $tempfile) {
 148                                 error("CGI::tmpFileName failed to return the uploaded file name");
 149                         }
 150                 }
 151
 152                 $filename=IkiWiki::linkpage(
 153                         IkiWiki::possibly_foolish_untaint(
 154                                 attachment_location($form->field('page')).
 155                                 IkiWiki::basename($filename)));
 156                 if (IkiWiki::file_pruned($filename, $config{srcdir})) {
 157                         error(gettext("bad attachment filename"));
 158                 }
 159
 160                 # Check that the user is allowed to edit a page with the
 161                 # name of the attachment.
 162                 IkiWiki::check_canedit($filename, $q, $session, 1);
 163                 # And that the attachment itself is acceptable.
 164                 check_canattach($session, $filename, $tempfile);
 165
 166                 # Needed for fast_file_copy and for rendering below.
 167                 require IkiWiki::Render;
 168
 169                 # Move the attachment into place.
 170                 # Try to use a fast rename; fall back to copying.
 171                 IkiWiki::prep_writefile($filename, $config{srcdir});
 172                 unlink($config{srcdir}."/".$filename);
 173                 if (rename($tempfile, $config{srcdir}."/".$filename)) {
 174                         # The temp file has tight permissions; loosen up.
 175                         chmod(0666 & ~umask, $config{srcdir}."/".$filename);
 176                 }
 177                 else {
 178                         my $fh=$q->upload('attachment');
 179                         if (! defined $fh || ! ref $fh) {
 180                                 # needed by old CGI versions
 181                                 $fh=$q->param('attachment');
 182                                 if (! defined $fh || ! ref $fh) {
 183                                         # even that doesn't always work,
 184                                         # fall back to opening the tempfile
 185                                         $fh=undef;
 186                                         open($fh, "<", $tempfile) || error("failed to open \"$tempfile\": $!");
 187                                 }
 188                         }
 189                         binmode($fh);
 190                         writefile($filename, $config{srcdir}, undef, 1, sub {
 191                                 IkiWiki::fast_file_copy($tempfile, $filename, $fh, @_);
 192                         });
 193                 }
 194
 195                 # Check the attachment in and trigger a wiki refresh.
 196                 if ($config{rcs}) {
 197                         IkiWiki::rcs_add($filename);
 198                         IkiWiki::disable_commit_hook();
 199                         IkiWiki::rcs_commit($filename, gettext("attachment upload"),
 200                                 IkiWiki::rcs_prepedit($filename),
 201                                 $session->param("name"), $ENV{REMOTE_ADDR});
 202                         IkiWiki::enable_commit_hook();
 203                         IkiWiki::rcs_update();
 204                 }
 205                 IkiWiki::refresh();
 206                 IkiWiki::saveindex();
 207         }
 208         elsif ($form->submitted eq "Insert Links") {
 209                 my $add="";
 210                 foreach my $f ($q->param("attachment_select")) {
 211                         $add.="[[$f]]\n";
 212                 }
 213                 $form->field(name => 'editcontent',
 214                         value => $form->field('editcontent')."\n\n".$add,
 215                         force => 1) if length $add;
 216         }
 217
 218         # Generate the attachment list only after having added any new
 219         # attachments.
 220         $form->tmpl_param("attachment_list" => [attachment_list($form->field('page'))]);
 221 } # }}}
 222
 223 sub attachment_location ($) { #{{{
 224         my $page=shift;
 225
 226         # Put the attachment in a subdir of the page it's attached
 227         # to, unless that page is an "index" page.
 228         $page=~s/(^|\/)index//;
 229         $page.="/" if length $page;
 230
 231         return $page;
 232 } #}}}
 233
 234 sub attachment_list ($) { #{{{
 235         my $page=shift;
 236         my $loc=attachment_location($page);
 237
 238         my @ret;
 239         foreach my $f (values %pagesources) {
 240                 if (! defined IkiWiki::pagetype($f) &&
 241                     $f=~m/^\Q$loc\E[^\/]+$/ &&
 242                     -e "$config{srcdir}/$f") {
 243                         push @ret, {
 244                                 "field-select" => '<input type="checkbox" name="attachment_select" value="'.$f.'" />',
 245                                 link => htmllink($page, $page, $f, noimageinline => 1),
 246                                 size => humansize((stat(_))[7]),
 247                                 mtime => displaytime($IkiWiki::pagemtime{$f}),
 248                                 mtime_raw => $IkiWiki::pagemtime{$f},
 249                         };
 250                 }
 251         }
 252
 253         # Sort newer attachments to the top of the list, so a newly-added
 254         # attachment appears just before the form used to add it.
 255         return sort { $b->{mtime_raw} <=> $a->{mtime_raw} || $a->{link} cmp $b->{link} } @ret;
 256 } #}}}
 257
 258 my %units=( #{{{        # size in bytes
 259         B               => 1,
 260         byte            => 1,
 261         KB              => 2 ** 10,
 262         kilobyte        => 2 ** 10,
 263         K               => 2 ** 10,
 264         KB              => 2 ** 10,
 265         kilobyte        => 2 ** 10,
 266         M               => 2 ** 20,
 267         MB              => 2 ** 20,
 268         megabyte        => 2 ** 20,
 269         G               => 2 ** 30,
 270         GB              => 2 ** 30,
 271         gigabyte        => 2 ** 30,
 272         T               => 2 ** 40,
 273         TB              => 2 ** 40,
 274         terabyte        => 2 ** 40,
 275         P               => 2 ** 50,
 276         PB              => 2 ** 50,
 277         petabyte        => 2 ** 50,
 278         E               => 2 ** 60,
 279         EB              => 2 ** 60,
 280         exabyte         => 2 ** 60,
 281         Z               => 2 ** 70,
 282         ZB              => 2 ** 70,
 283         zettabyte       => 2 ** 70,
 284         Y               => 2 ** 80,
 285         YB              => 2 ** 80,
 286         yottabyte       => 2 ** 80,
 287         # ikiwiki, if you find you need larger data quantities, either modify
 288         # yourself to add them, or travel back in time to 2008 and kill me.
 289         #   -- Joey
 290 ); #}}}
 291
 292 sub parsesize ($) { #{{{
 293         my $size=shift;
 294
 295         no warnings;
 296         my $base=$size+0; # force to number
 297         use warnings;
 298         foreach my $unit (sort keys %units) {
 299                 if ($size=~/[0-9\s]\Q$unit\E$/i) {
 300                         return $base * $units{$unit};
 301                 }
 302         }
 303         return $base;
 304 } #}}}
 305
 306 sub humansize ($) { #{{{
 307         my $size=shift;
 308
 309         foreach my $unit (reverse sort { $units{$a} <=> $units{$b} || $b cmp $a } keys %units) {
 310                 if ($size / $units{$unit} > 0.25) {
 311                         return (int($size / $units{$unit} * 10)/10).$unit;
 312                 }
 313         }
 314         return $size; # near zero, or negative
 315 } #}}}
 316
 317 package IkiWiki::PageSpec;
 318
 319 sub match_maxsize ($$;@) { #{{{
 320         shift;
 321         my $maxsize=eval{IkiWiki::Plugin::attachment::parsesize(shift)};
 322         if ($@) {
 323                 return IkiWiki::FailReason->new("unable to parse maxsize (or number too large)");
 324         }
 325
 326         my %params=@_;
 327         if (! exists $params{file}) {
 328                 return IkiWiki::FailReason->new("no file specified");
 329         }
 330
 331         if (-s $params{file} > $maxsize) {
 332                 return IkiWiki::FailReason->new("file too large (".(-s $params{file})." >  $maxsize)");
 333         }
 334         else {
 335                 return IkiWiki::SuccessReason->new("file not too large");
 336         }
 337 } #}}}
 338
 339 sub match_minsize ($$;@) { #{{{
 340         shift;
 341         my $minsize=eval{IkiWiki::Plugin::attachment::parsesize(shift)};
 342         if ($@) {
 343                 return IkiWiki::FailReason->new("unable to parse minsize (or number too large)");
 344         }
 345
 346         my %params=@_;
 347         if (! exists $params{file}) {
 348                 return IkiWiki::FailReason->new("no file specified");
 349         }
 350
 351         if (-s $params{file} < $minsize) {
 352                 return IkiWiki::FailReason->new("file too small");
 353         }
 354         else {
 355                 return IkiWiki::SuccessReason->new("file not too small");
 356         }
 357 } #}}}
 358
 359 sub match_mimetype ($$;@) { #{{{
 360         shift;
 361         my $wanted=shift;
 362
 363         my %params=@_;
 364         if (! exists $params{file}) {
 365                 return IkiWiki::FailReason->new("no file specified");
 366         }
 367
 368         # Use ::magic to get the mime type, the idea is to only trust
 369         # data obtained by examining the actual file contents.
 370         eval q{use File::MimeInfo::Magic};
 371         if ($@) {
 372                 return IkiWiki::FailReason->new("failed to load File::MimeInfo::Magic ($@); cannot check MIME type");
 373         }
 374         my $mimetype=File::MimeInfo::Magic::magic($params{file});
 375         if (! defined $mimetype) {
 376                 $mimetype="unknown";
 377         }
 378
 379         my $regexp=IkiWiki::glob2re($wanted);
 380         if ($mimetype!~/^$regexp$/i) {
 381                 return IkiWiki::FailReason->new("file MIME type is $mimetype, not $wanted");
 382         }
 383         else {
 384                 return IkiWiki::SuccessReason->new("file MIME type is $mimetype");
 385         }
 386 } #}}}
 387
 388 sub match_virusfree ($$;@) { #{{{
 389         shift;
 390         my $wanted=shift;
 391
 392         my %params=@_;
 393         if (! exists $params{file}) {
 394                 return IkiWiki::FailReason->new("no file specified");
 395         }
 396
 397         if (! exists $IkiWiki::config{virus_checker} ||
 398             ! length $IkiWiki::config{virus_checker}) {
 399                 return IkiWiki::FailReason->new("no virus_checker configured");
 400         }
 401
 402         # The file needs to be fed into the virus checker on stdin,
 403         # because the file is not world-readable, and if clamdscan is
 404         # used, clamd would fail to read it.
 405         eval q{use IPC::Open2};
 406         error($@) if $@;
 407         open (IN, "<", $params{file}) || return IkiWiki::FailReason->new("failed to read file");
 408         binmode(IN);
 409         my $sigpipe=0;
 410         $SIG{PIPE} = sub { $sigpipe=1 };
 411         my $pid=open2(\*CHECKER_OUT, "<&IN", $IkiWiki::config{virus_checker});
 412         my $reason=<CHECKER_OUT>;
 413         chomp $reason;
 414         1 while (<CHECKER_OUT>);
 415         close(CHECKER_OUT);
 416         waitpid $pid, 0;
 417         $SIG{PIPE}="DEFAULT";
 418         if ($sigpipe || $?) {
 419                 if (! length $reason) {
 420                         $reason="virus checker $IkiWiki::config{virus_checker}; failed with no output";
 421                 }
 422                 return IkiWiki::FailReason->new("file seems to contain a virus ($reason)");
 423         }
 424         else {
 425                 return IkiWiki::SuccessReason->new("file seems virusfree ($reason)");
 426         }
 427 } #}}}
 428
 429 sub match_ispage ($$;@) { #{{{
 430         my $filename=shift;
 431
 432         if (defined IkiWiki::pagetype($filename)) {
 433                 return IkiWiki::SuccessReason->new("file is a wiki page");
 434         }
 435         else {
 436                 return IkiWiki::FailReason->new("file is not a wiki page");
 437         }
 438 } #}}}
 439
 440 sub match_user ($$;@) { #{{{
 441         shift;
 442         my $user=shift;
 443         my %params=@_;
 444
 445         if (! exists $params{user}) {
 446                 return IkiWiki::FailReason->new("no user specified");
 447         }
 448
 449         if (defined $params{user} && lc $params{user} eq lc $user) {
 450                 return IkiWiki::SuccessReason->new("user is $user");
 451         }
 452         elsif (! defined $params{user}) {
 453                 return IkiWiki::FailReason->new("not logged in");
 454         }
 455         else {
 456                 return IkiWiki::FailReason->new("user is $params{user}, not $user");
 457         }
 458 } #}}}
 459
 460 sub match_ip ($$;@) { #{{{
 461         shift;
 462         my $ip=shift;
 463         my %params=@_;
 464
 465         if (! exists $params{ip}) {
 466                 return IkiWiki::FailReason->new("no IP specified");
 467         }
 468
 469         if (defined $params{ip} && lc $params{ip} eq lc $ip) {
 470                 return IkiWiki::SuccessReason->new("IP is $ip");
 471         }
 472         else {
 473                 return IkiWiki::FailReason->new("IP is $params{ip}, not $ip");
 474         }
 475 } #}}}
 476
 477 1