mdw@git.distorted.org.uk Git - tgal/blob - mason/.perl-lib/TrivGal.pm

   1 ### -*-cperl-*-
   2 ###
   3 ### Main output for Trivial Gallery.
   4 ###
   5 ### (c) 2021 Mark Wooding
   6 ###
   7
   8 ###----- Licensing notice ---------------------------------------------------
   9 ###
  10 ### This file is part of Trivial Gallery.
  11 ###
  12 ### Trivial Gallery is free software: you can redistribute it and/or modify
  13 ### it under the terms of the GNU Affero General Public License as
  14 ### published by the Free Software Foundation; either version 3 of the
  15 ### License, or (at your option) any later version.
  16 ###
  17 ### Trivial Gallery is distributed in the hope that it will be useful, but
  18 ### WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 ### Affero General Public License for more details.
  21 ###
  22 ### You should have received a copy of the GNU Affero General Public
  23 ### License along with Trivial Gallery.  If not, see
  24 ### <https://www.gnu.org/licenses/>.
  25
  26 package TrivGal;
  27
  28 use autodie qw{:all};
  29
  30 use Errno;
  31 use Exporter qw{import};
  32 use File::stat;
  33 use Image::ExifTool qw{};
  34 use Image::Imlib2;
  35 use Image::Size qw{};
  36 use User::pwent;
  37 use POSIX;
  38
  39 our @EXPORT;
  40 sub export (@) { push @EXPORT, @_; }
  41
  42 ###--------------------------------------------------------------------------
  43 ### Internal utilities.
  44
  45 sub read_or_set ($\$@) {
  46   my ($me, $ref, @args) = @_;
  47   if (@args == 0) { return $$ref; }
  48   elsif (@args == 1) { $$ref = $args[0]; return $me; }
  49   elsif (@args > 1) { die "too many arguments"; }
  50 }
  51
  52 ###--------------------------------------------------------------------------
  53 ### Random utilities.
  54
  55 export qw{join_paths};
  56 sub join_paths (@) {
  57   my @p = @_;
  58   my $p = "";
  59   ELT: for my $e (@p) {
  60     $e =~ s#^/{2,}#/#;
  61     $e =~ s#([^/])/+$#$1#;
  62     if ($e eq "") { next ELT; }
  63     elsif ($p eq "" || $e =~ m#^/#) { $p = $e; }
  64     else { $p = "$p/$e"; }
  65   }
  66   return $p;
  67 }
  68
  69 export qw{split_path};
  70 sub split_path ($) {
  71   my ($path) = @_;
  72
  73   my ($dir, $base, $ext) =
  74     $path =~ m#^ (?: (.*) /)?
  75                  (?: ([^/]*) \.)?
  76                  ([^./]*) $#x;
  77   if (defined $base) { $ext = ".$ext"; }
  78   else { $base = $ext; $ext = ""; }
  79   return ($dir, $base, $ext);
  80 }
  81
  82 export qw{urlencode};
  83 sub urlencode ($) {
  84   my ($u) = @_;
  85   $u =~ s#([^0-9a-zA-Z_./~-])#sprintf "%%%02x", ord $1#eg;
  86   return $u;
  87 }
  88
  89 export qw{urldecode};
  90 sub urldecode ($) {
  91   my ($u) = @_;
  92   $u =~ s#\%([0-9a-fA-F]{2})#chr hex $1#eg;
  93   return $u;
  94 }
  95
  96 ###--------------------------------------------------------------------------
  97 ### Image types.
  98
  99 our %TYPE;
 100
 101 package TrivGal::ImageType {
 102   sub new ($$) {
 103     my ($cls, $ext) = @_;
 104     return $TYPE{$ext} = bless { ext => $ext }, $cls;
 105   }
 106   sub ext ($) {
 107     my ($me, @args) = @_;
 108     return $me->{ext};
 109   }
 110   sub mimetype ($@) {
 111     my ($me, @args) = @_;
 112     return TrivGal::read_or_set $me, $me->{mimetype}, @args;
 113   }
 114   sub imlibfmt ($@) {
 115     my ($me, @args) = @_;
 116     return TrivGal::read_or_set $me, $me->{imlibfmt}, @args;
 117   }
 118 }
 119
 120 TrivGal::ImageType->new(".jpg")->mimetype("image/jpeg")->imlibfmt("jpeg");
 121 TrivGal::ImageType->new(".png")->mimetype("image/png")->imlibfmt("png");
 122
 123 ###--------------------------------------------------------------------------
 124 ### Configuration.
 125
 126 export qw{$SCOPE $SUFFIX};
 127 our $SCOPE //= $::SCOPE;
 128 our $SUFFIX //= $::SUFFIX;
 129
 130 export qw{$IMGROOT $CACHE $TMP};
 131 our $IMGROOT //= "$ENV{HOME}/publish/$SCOPE-html$SUFFIX/tgal-images";
 132 our $CACHE //=
 133   ($ENV{XDG_CACHE_HOME} // "$ENV{HOME}/.cache") .
 134   "/tgal/$SCOPE$SUFFIX";
 135 our $TMP //= "$CACHE/tmp";
 136
 137 export qw{$ROOTURL $IMGURL $CACHEURL $STATICURL $SCRIPTURL};
 138 my $user = getpwuid($>)->name;
 139 our $ROOTURL //= "/~$user";
 140 our $IMGURL //= "$ROOTURL/tgal-images";
 141 our $CACHEURL //= "$ROOTURL/tgal-cache";
 142 our $STATICURL //= "$ROOTURL/tgal-static";
 143 our $SCRIPTURL;
 144
 145 export qw{$SRCURL};
 146 our $SRCURL = "https://git.distorted.org.uk/~mdw/tgal/";
 147
 148 export qw{%SIZE};
 149 our %SIZE = (smallthumb => 96,
 150              medthumb => 144,
 151              bigthumb => 216,
 152              tiny => 320,
 153              small => 480,
 154              embed => 720,
 155              medium => 1080,
 156              big => 1600,
 157              large => 2400,
 158              huge => 3600,
 159              vast => 5400,
 160              immense => 8100);
 161
 162 export qw{init};
 163 my $initp = 0;
 164 sub init () {
 165   my $m = HTML::Mason::Request->instance;
 166   my $r = $m->cgi_request;
 167
 168   $m->interp->set_escape(u => sub { my ($r) = @_; $$r = urlencode $$r; });
 169
 170   return unless !$initp;
 171
 172   $SCRIPTURL //= $r->subprocess_env("SCRIPT_NAME");
 173   $initp = 1;
 174 }
 175
 176 ###--------------------------------------------------------------------------
 177 ### Temporary files.
 178
 179 export qw{clean_temp_files};
 180 sub clean_temp_files () {
 181   my $d;
 182
 183   eval { opendir $d, $TMP; };
 184   if ($@) {
 185     if ($@->isa("autodie::exception") && $@->errno == ENOENT) { return; }
 186     else { die $@; }
 187   }
 188   my $now = time;
 189   FILE: while (my $name = readdir $d) {
 190     next FILE unless $name =~ /^t(\d+)\-/;
 191     my $pid = $1;
 192     next FILE if kill 0, $pid;
 193     my $f = "$TMP/$name";
 194     my $st = stat $name;
 195     next FILE if $now - $st->mtime() < 300;
 196     unlink $f;
 197   }
 198   closedir $d;
 199 }
 200
 201 ###--------------------------------------------------------------------------
 202 ### Scaled images.
 203
 204 my %ORIENT =
 205   (1 => [0, 0],
 206    2 => [0, 1],
 207    3 => [2, 0],
 208    4 => [2, 1],
 209    5 => [3, 1],
 210    6 => [1, 0],
 211    7 => [1, 1],
 212    8 => [3, 0]);
 213
 214 package TrivGal::Image {
 215   use File::Path qw{make_path};
 216   use File::stat;
 217
 218   sub new ($$) {
 219     my ($cls, $path) = @_;
 220     my $imgpath = "$IMGROOT/$path";
 221     my $st = stat $imgpath or die "no image `$path'";
 222     return bless {
 223       path => $path, imgpath => $imgpath,
 224       mtime => $st->mtime,
 225       img => undef,
 226       rot => undef, flip => undef,
 227       wd => undef, ht => undef,
 228       _wd => undef, _ht => undef,
 229       sz => undef
 230     }, $cls;
 231   }
 232
 233   sub _getsz ($) {
 234     my ($me) = @_;
 235     return if defined $me->{_wd};
 236
 237     my ($wd, $ht, $err) = Image::Size::imgsize $me->{imgpath};
 238     defined $wd or die "failed to read size of `$me->{path}': $err";
 239     my $sz = $wd; if ($sz < $ht) { $sz = $ht; }
 240     @$me{"_wd", "_ht", "sz"} = ($wd, $ht, $sz);
 241   }
 242
 243   sub _getexif ($) {
 244     my ($me) = @_;
 245     return if defined $me->{wd};
 246
 247     $me->_getsz;
 248     my $exif = new Image::ExifTool; $exif->ExtractInfo($me->{imgpath});
 249     my $orient = $exif->GetValue("Orientation", "ValueConv");
 250     my ($wd, $ht) = @$me{"_wd", "_ht"};
 251     my ($rot, $flip);
 252     if (defined $orient) { ($rot, $flip) = $ORIENT{$orient}->@*; }
 253     else { ($rot, $flip) = (0, 0); }
 254     if ($rot%2) { ($wd, $ht) = ($ht, $wd); }
 255     @$me{"rot", "flip", "wd", "ht"} = ($rot, $flip, $wd, $ht);
 256   }
 257
 258   sub sz ($) { my ($me) = @_; $me->_getsz; return $me->{sz}; }
 259   sub wd ($) { my ($me) = @_; $me->_getexif; return $me->{wd}; }
 260   sub ht ($) { my ($me) = @_; $me->_getexif; return $me->{ht}; }
 261
 262   sub scale ($$;$) {
 263     my ($me, $scale, $forcep) = @_;
 264     my $m = HTML::Mason::Request->instance;
 265
 266     my $path = $me->{path};
 267     my $sz = $SIZE{$scale} or die "unknown scale `$scale'";
 268     my $url;
 269
 270     if ($me->sz <= $sz)
 271       { $url = $m->interp->apply_escapes("$IMGURL/$path", "u"); }
 272     else {
 273       my $tail = "scale.$sz/$path";
 274       my $thumb = "$CACHE/$tail";
 275       my $thumburl = $m->interp->apply_escapes("$CACHEURL/$tail", "u");
 276
 277       my $st = stat $thumb;
 278       if ($st && $st->mtime > $me->{mtime})
 279         { $url = $thumburl; }
 280       elsif (!$forcep) {
 281         $url =
 282           $m->interp->apply_escapes("$SCRIPTURL/$path", "u") .
 283           "?scale=$scale";
 284       } else {
 285         my $img = $me->{img};
 286         unless (defined $img) {
 287           $me->_getexif;
 288           $img = $me->{img} = Image::Imlib2->load($me->{imgpath});
 289           if ($me->{rot}) { $img->image_orientate($me->{rot}); }
 290           if ($me->{flip}) { $img->flip_horizontal(); }
 291         }
 292
 293         my ($dir, undef, $ext) = TrivGal::split_path $thumb;
 294         my $ty = $TYPE{lc $ext} or die "unknown type `$ext'";
 295         my $sc = $sz/$me->sz;
 296         my $scaled = $img->create_scaled_image($sc*$wd, $sc*$ht);
 297
 298         $scaled->image_set_format($ty->imlibfmt);
 299         $scaled->set_quality(90);
 300         my $new = "$TMP/t$$-$ext";
 301         make_path $TMP, { mode => 0771 };
 302         $scaled->save($new);
 303         make_path $dir, { mode => 0771 };
 304         rename $new, $thumb;
 305         $url = $thumburl;
 306       }
 307     }
 308
 309     return $url;
 310   }
 311 }
 312
 313 ###--------------------------------------------------------------------------
 314 ### Directory listings.
 315
 316 package TrivGal::Item {
 317   sub new ($$) {
 318     my ($cls, $name) = @_;
 319     return bless { name => $name }, $cls;
 320   }
 321   sub name ($@) {
 322     my ($me, @args) = @_;
 323     return TrivGal::read_or_set $me, $me->{name}, @args;
 324   }
 325   sub comment ($@) {
 326     my ($me, @args) = @_;
 327     return TrivGal::read_or_set $me, $me->{comment}, @args;
 328   }
 329 }
 330
 331 export qw{listdir};
 332 sub listdir ($) {
 333   my ($path) = @_;
 334   my (@d, @f);
 335   my $ix = undef;
 336
 337   $path =~ s#/$##;
 338   if (-f "$path/.tgal.index") {
 339     open my $f, "<", "$path/.tgal.index";
 340     my $item = undef;
 341     my $comment = undef;
 342     LINE: while (<$f>) {
 343       chomp;
 344       next LINE if /^\s*(\#|$)/;
 345       if (s/^\s+//) {
 346         die "no item" unless $item;
 347         $comment = defined $comment ? $comment . "\n" . $_ : $_;
 348       } else {
 349         if ($item && $comment) { $item->comment($comment); }
 350         my ($flags, $name, $c) =
 351           /^ (?: ([-!]+) \s+)?          # flags
 352              (\S+) \s*                  # filename
 353              (\S | \S.*\S )?            # start of the comment
 354              \s*
 355              $/x;
 356         my $indexp = $flags =~ /!/;
 357         my $hidep = $flags =~ /-/;
 358         $name = urldecode $name;
 359         my $list;
 360         $item = TrivGal::Item->new($name);
 361         if ($name =~ m#/$#) {
 362           $list = \@d;
 363           die "can't index a folder" if $indexp;
 364         } else {
 365           $list = \@f;
 366           my (undef, undef, $ext) = split_path $name;
 367           die "unknown image type" unless $TYPE{lc $ext};
 368           if ($indexp) {
 369             die "two index images" if defined $ix;
 370             $ix = $item;
 371           }
 372         }
 373         $comment = $c;
 374         push @$list, $item unless $hidep;
 375       }
 376     }
 377     if ($item && $comment) { $item->comment($comment); }
 378     close $f;
 379   } else {
 380     my $st = stat $path;
 381     unless ($st->mode&0004) { return ([], [], undef); }
 382
 383     opendir $d, $path;
 384     my @e = readdir $d;
 385     closedir $d;
 386
 387     ENT: for my $e (sort @e) {
 388       my (undef, undef, $ext) = split_path $e;
 389       my $dotp = $e =~ /^\./;
 390       my $st = stat "$path/$e";
 391       my $list = undef;
 392       if ($dotp) { }
 393       elsif (-d $st) { $list = \@d; $e .= "/"; }
 394       elsif ($TYPE{lc $ext} && -f $st) { $list = \@f; }
 395       $list and push @$list, TrivGal::Item->new($e);
 396     }
 397     $ix = $f[0] if @f;
 398   }
 399
 400   return (\@d, \@f, $ix);
 401 }
 402
 403 export qw{contents};
 404 sub contents ($) {
 405   my ($file) = @_;
 406   my $contents = "";
 407   my $f;
 408   local $@;
 409   eval { open $f, "<", "$file"; };
 410   if ($@) {
 411     if ($@->isa("autodie::exception") && $@->errno == ENOENT)
 412       { return undef; }
 413     die $@;
 414   }
 415   while (sysread $f, $buf, 16384) { $contents .= $buf; }
 416   close $f;
 417   return $contents;
 418 }
 419
 420 export qw{find_covering_file};
 421 sub find_covering_file ($$$) {
 422   my ($top, $path, $name) = @_;
 423   for (;;) {
 424     my $stuff = contents "$top/$path/$name"; return $stuff if defined $stuff;
 425     if ($path eq "") { return undef; }
 426     if ($path =~ m#^(.*)/[^/]+/?#) { $path = $1; }
 427     else { $path = ""; }
 428   }
 429 }
 430
 431 ###----- That's all, folks --------------------------------------------------
 432
 433 clean_temp_files;
 434
 435 1;