IkiWiki/Plugin/filecheck.pm

   1 #!/usr/bin/perl
   2 package IkiWiki::Plugin::filecheck;
   3
   4 use warnings;
   5 use strict;
   6 use IkiWiki 3.00;
   7
   8 my %units=(             # size in bytes
   9         B               => 1,
  10         byte            => 1,
  11         KB              => 2 ** 10,
  12         kilobyte        => 2 ** 10,
  13         K               => 2 ** 10,
  14         KB              => 2 ** 10,
  15         kilobyte        => 2 ** 10,
  16         M               => 2 ** 20,
  17         MB              => 2 ** 20,
  18         megabyte        => 2 ** 20,
  19         G               => 2 ** 30,
  20         GB              => 2 ** 30,
  21         gigabyte        => 2 ** 30,
  22         T               => 2 ** 40,
  23         TB              => 2 ** 40,
  24         terabyte        => 2 ** 40,
  25         P               => 2 ** 50,
  26         PB              => 2 ** 50,
  27         petabyte        => 2 ** 50,
  28         E               => 2 ** 60,
  29         EB              => 2 ** 60,
  30         exabyte         => 2 ** 60,
  31         Z               => 2 ** 70,
  32         ZB              => 2 ** 70,
  33         zettabyte       => 2 ** 70,
  34         Y               => 2 ** 80,
  35         YB              => 2 ** 80,
  36         yottabyte       => 2 ** 80,
  37         # ikiwiki, if you find you need larger data quantities, either modify
  38         # yourself to add them, or travel back in time to 2008 and kill me.
  39         #   -- Joey
  40 );
  41
  42 sub import {
  43         hook(type => "getsetup", id => "filecheck",  call => \&getsetup);
  44 }
  45
  46 sub getsetup () {
  47         return
  48                 plugin => {
  49                         safe => 1,
  50                         rebuild => undef,
  51                         section => "misc",
  52                 },
  53 }
  54
  55 sub parsesize ($) {
  56         my $size=shift;
  57
  58         no warnings;
  59         my $base=$size+0; # force to number
  60         use warnings;
  61         foreach my $unit (sort keys %units) {
  62                 if ($size=~/[0-9\s]\Q$unit\E$/i) {
  63                         return $base * $units{$unit};
  64                 }
  65         }
  66         return $base;
  67 }
  68
  69 # This is provided for other plugins that want to convert back the other way.
  70 sub humansize ($) {
  71         my $size=shift;
  72
  73         foreach my $unit (reverse sort { $units{$a} <=> $units{$b} || $b cmp $a } keys %units) {
  74                 if ($size / $units{$unit} > 0.25) {
  75                         return (int($size / $units{$unit} * 10)/10).$unit;
  76                 }
  77         }
  78         return $size; # near zero, or negative
  79 }
  80
  81 package IkiWiki::PageSpec;
  82
  83 sub match_maxsize ($$;@) {
  84         my $page=shift;
  85         my $maxsize=eval{IkiWiki::Plugin::filecheck::parsesize(shift)};
  86         if ($@) {
  87                 return IkiWiki::ErrorReason->new("unable to parse maxsize (or number too large)");
  88         }
  89
  90         my %params=@_;
  91         my $file=exists $params{file} ? $params{file} : IkiWiki::srcfile($IkiWiki::pagesources{$page});
  92         if (! defined $file) {
  93                 return IkiWiki::ErrorReason->new("file does not exist");
  94         }
  95
  96         if (-s $file > $maxsize) {
  97                 return IkiWiki::FailReason->new("file too large (".(-s $file)." >  $maxsize)");
  98         }
  99         else {
 100                 return IkiWiki::SuccessReason->new("file not too large");
 101         }
 102 }
 103
 104 sub match_minsize ($$;@) {
 105         my $page=shift;
 106         my $minsize=eval{IkiWiki::Plugin::filecheck::parsesize(shift)};
 107         if ($@) {
 108                 return IkiWiki::ErrorReason->new("unable to parse minsize (or number too large)");
 109         }
 110
 111         my %params=@_;
 112         my $file=exists $params{file} ? $params{file} : IkiWiki::srcfile($IkiWiki::pagesources{$page});
 113         if (! defined $file) {
 114                 return IkiWiki::ErrorReason->new("file does not exist");
 115         }
 116
 117         if (-s $file < $minsize) {
 118                 return IkiWiki::FailReason->new("file too small");
 119         }
 120         else {
 121                 return IkiWiki::SuccessReason->new("file not too small");
 122         }
 123 }
 124
 125 sub match_mimetype ($$;@) {
 126         my $page=shift;
 127         my $wanted=shift;
 128
 129         my %params=@_;
 130         my $file=exists $params{file} ? $params{file} : IkiWiki::srcfile($IkiWiki::pagesources{$page});
 131         if (! defined $file) {
 132                 return IkiWiki::ErrorReason->new("file does not exist");
 133         }
 134
 135         # Get the mime type.
 136         #
 137         # First, try File::Mimeinfo. This is fast, but doesn't recognise
 138         # all files.
 139         eval q{use File::MimeInfo::Magic};
 140         my $mimeinfo_ok=! $@;
 141         my $mimetype;
 142         if ($mimeinfo_ok) {
 143                 my $mimetype=File::MimeInfo::Magic::magic($file);
 144         }
 145
 146         # Fall back to using file, which has a more complete
 147         # magic database.
 148         if (! defined $mimetype) {
 149                 open(my $file_h, "-|", "file", "-bi", $file);
 150                 $mimetype=<$file_h>;
 151                 chomp $mimetype;
 152                 close $file_h;
 153         }
 154         if (! defined $mimetype || $mimetype !~s /;.*//) {
 155                 # Fall back to default value.
 156                 $mimetype=File::MimeInfo::Magic::default($file)
 157                         if $mimeinfo_ok;
 158                 if (! defined $mimetype) {
 159                         $mimetype="unknown";
 160                 }
 161         }
 162
 163         my $regexp=IkiWiki::glob2re($wanted);
 164         if ($mimetype!~$regexp) {
 165                 return IkiWiki::FailReason->new("file MIME type is $mimetype, not $wanted");
 166         }
 167         else {
 168                 return IkiWiki::SuccessReason->new("file MIME type is $mimetype");
 169         }
 170 }
 171
 172 sub match_virusfree ($$;@) {
 173         my $page=shift;
 174         my $wanted=shift;
 175
 176         my %params=@_;
 177         my $file=exists $params{file} ? $params{file} : IkiWiki::srcfile($IkiWiki::pagesources{$page});
 178         if (! defined $file) {
 179                 return IkiWiki::ErrorReason->new("file does not exist");
 180         }
 181
 182         if (! exists $IkiWiki::config{virus_checker} ||
 183             ! length $IkiWiki::config{virus_checker}) {
 184                 return IkiWiki::ErrorReason->new("no virus_checker configured");
 185         }
 186
 187         # The file needs to be fed into the virus checker on stdin,
 188         # because the file is not world-readable, and if clamdscan is
 189         # used, clamd would fail to read it.
 190         eval q{use IPC::Open2};
 191         error($@) if $@;
 192         open (IN, "<", $file) || return IkiWiki::ErrorReason->new("failed to read file");
 193         binmode(IN);
 194         my $sigpipe=0;
 195         $SIG{PIPE} = sub { $sigpipe=1 };
 196         my $pid=open2(\*CHECKER_OUT, "<&IN", $IkiWiki::config{virus_checker});
 197         my $reason=<CHECKER_OUT>;
 198         chomp $reason;
 199         1 while (<CHECKER_OUT>);
 200         close(CHECKER_OUT);
 201         waitpid $pid, 0;
 202         $SIG{PIPE}="DEFAULT";
 203         if ($sigpipe || $?) {
 204                 if (! length $reason) {
 205                         $reason="virus checker $IkiWiki::config{virus_checker}; failed with no output";
 206                 }
 207                 return IkiWiki::FailReason->new("file seems to contain a virus ($reason)");
 208         }
 209         else {
 210                 return IkiWiki::SuccessReason->new("file seems virusfree ($reason)");
 211         }
 212 }
 213
 214 sub match_ispage ($$;@) {
 215         my $filename=shift;
 216
 217         if (defined IkiWiki::pagetype($filename)) {
 218                 return IkiWiki::SuccessReason->new("file is a wiki page");
 219         }
 220         else {
 221                 return IkiWiki::FailReason->new("file is not a wiki page");
 222         }
 223 }