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 User::pwent;
  36 use POSIX;
  37
  38 our @EXPORT;
  39 sub export (@) { push @EXPORT, @_; }
  40
  41 ###--------------------------------------------------------------------------
  42 ### Internal utilities.
  43
  44 sub read_or_set ($\$@) {
  45   my ($me, $ref, @args) = @_;
  46   if (@args == 0) { return $$ref; }
  47   elsif (@args == 1) { $$ref = $args[0]; return $me; }
  48   elsif (@args > 1) { die "too many arguments"; }
  49 }
  50
  51 ###--------------------------------------------------------------------------
  52 ### Random utilities.
  53
  54 export qw{join_paths};
  55 sub join_paths (@) {
  56   my @p = @_;
  57   my $p = "";
  58   ELT: for my $e (@p) {
  59     $e =~ s#^/{2,}#/#;
  60     $e =~ s#([^/])/+$#$1#;
  61     if ($e eq "") { next ELT; }
  62     elsif ($p eq "" || $e =~ m#^/#) { $p = $e; }
  63     else { $p = "$p/$e"; }
  64   }
  65   return $p;
  66 }
  67
  68 export qw{split_path};
  69 sub split_path ($) {
  70   my ($path) = @_;
  71
  72   my ($dir, $base, $ext) =
  73     $path =~ m#^ (?: (.*) /)?
  74                  (?: ([^/]*) \.)?
  75                  ([^./]*) $#x;
  76   if (defined $base) { $ext = ".$ext"; }
  77   else { $base = $ext; $ext = ""; }
  78   return ($dir, $base, $ext);
  79 }
  80
  81 export qw{urlencode};
  82 sub urlencode ($) {
  83   my ($u) = @_;
  84   $u =~ s#([^0-9a-zA-Z_./~-])#sprintf "%%%02x", ord $1#eg;
  85   return $u;
  86 }
  87
  88 export qw{urldecode};
  89 sub urldecode ($) {
  90   my ($u) = @_;
  91   $u =~ s#\%([0-9a-fA-F]{2})#chr hex $1#eg;
  92   return $u;
  93 }
  94
  95 ###--------------------------------------------------------------------------
  96 ### Image types.
  97
  98 our %TYPE;
  99
 100 package TrivGal::ImageType {
 101   sub new ($$) {
 102     my ($cls, $ext) = @_;
 103     return $TYPE{$ext} = bless { ext => $ext }, $cls;
 104   }
 105   sub ext ($) {
 106     my ($me, @args) = @_;
 107     return $me->{ext};
 108   }
 109   sub mimetype ($@) {
 110     my ($me, @args) = @_;
 111     return TrivGal::read_or_set $me, $me->{mimetype}, @args;
 112   }
 113   sub imlibfmt ($@) {
 114     my ($me, @args) = @_;
 115     return TrivGal::read_or_set $me, $me->{imlibfmt}, @args;
 116   }
 117 }
 118
 119 TrivGal::ImageType->new(".jpg")->mimetype("image/jpeg")->imlibfmt("jpeg");
 120 TrivGal::ImageType->new(".png")->mimetype("image/png")->imlibfmt("png");
 121
 122 ###--------------------------------------------------------------------------
 123 ### Configuration.
 124
 125 export qw{$SCOPE $SUFFIX};
 126 our $SCOPE //= $::SCOPE;
 127 our $SUFFIX //= $::SUFFIX;
 128
 129 export qw{$IMGROOT $CACHE $TMP};
 130 our $IMGROOT //= "$ENV{HOME}/publish/$SCOPE-html$SUFFIX/tgal-images";
 131 our $CACHE //=
 132   ($ENV{XDG_CACHE_HOME} // "$ENV{HOME}/.cache") .
 133   "/tgal/$SCOPE$SUFFIX";
 134 our $TMP //= "$CACHE/tmp";
 135
 136 export qw{$ROOTURL $IMGURL $CACHEURL $STATICURL $SCRIPTURL};
 137 my $user = getpwuid($>)->name;
 138 our $ROOTURL //= "/~$user";
 139 our $IMGURL //= "$ROOTURL/tgal-images";
 140 our $CACHEURL //= "$ROOTURL/tgal-cache";
 141 our $STATICURL //= "$ROOTURL/tgal-static";
 142 our $SCRIPTURL;
 143
 144 export qw{$SRCURL};
 145 our $SRCURL = "https://git.distorted.org.uk/~mdw/tgal/";
 146
 147 export qw{%SIZE};
 148 our %SIZE = (smallthumb => 96,
 149              medthumb => 144,
 150              bigthumb => 228,
 151              view => 1200);
 152
 153 export qw{init};
 154 my $initp = 0;
 155 sub init () {
 156   my $m = HTML::Mason::Request->instance;
 157   my $r = $m->cgi_request;
 158
 159   $m->interp->set_escape(u => sub { my ($r) = @_; $$r = urlencode $$r; });
 160
 161   return unless !$initp;
 162
 163   $SCRIPTURL //= $r->subprocess_env("SCRIPT_NAME");
 164   $initp = 1;
 165 }
 166
 167 ###--------------------------------------------------------------------------
 168 ### Temporary files.
 169
 170 export qw{clean_temp_files};
 171 sub clean_temp_files () {
 172   my $d;
 173
 174   eval { opendir $d, $TMP; };
 175   if ($@) {
 176     if ($@->isa("autodie::exception") && $@->errno == ENOENT) { return; }
 177     else { die $@; }
 178   }
 179   my $now = time;
 180   FILE: while (my $name = readdir $d) {
 181     next FILE unless $name =~ /^t(\d+)\-/;
 182     my $pid = $1;
 183     next FILE if kill 0, $pid;
 184     my $f = "$TMP/$name";
 185     my $st = stat $name;
 186     next FILE if $now - $st->mtime() < 300;
 187     unlink $f;
 188   }
 189   closedir $d;
 190 }
 191
 192 ###--------------------------------------------------------------------------
 193 ### Scaled images.
 194
 195 my %ORIENT =
 196   (1 => [0, 0],
 197    2 => [0, 1],
 198    3 => [2, 0],
 199    4 => [2, 1],
 200    5 => [3, 1],
 201    6 => [1, 0],
 202    7 => [1, 1],
 203    8 => [3, 0]);
 204
 205 package TrivGal::Image {
 206   use File::Path qw{make_path};
 207   use File::stat;
 208
 209   sub new ($$) {
 210     my ($cls, $path) = @_;
 211     my $imgpath = "$IMGROOT/$path";
 212     my $st = stat $imgpath or die "no image `$path'";
 213     return bless {
 214       path => $path,
 215       mtime => $st->mtime,
 216       img => undef
 217     }, $cls;
 218   }
 219
 220   sub scale ($$) {
 221     my ($me, $scale) = @_;
 222
 223     my $path = $me->{path};
 224     my $sz = $SIZE{$scale} or die "unknown scale `$scale'";
 225     my $thumb = "$CACHE/scale.$sz/$path";
 226     my $thumburl = "$CACHEURL/scale.$sz/$path";
 227     my $st = stat $thumb;
 228     if (defined $st && $st->mtime > $me->{mtime}) { return $thumburl; }
 229
 230     my ($dir, $base, $ext) = TrivGal::split_path $thumb;
 231     my $ty = $TYPE{lc $ext} or die "unknown type `$ext'";
 232
 233     my $img = $me->{img};
 234     unless (defined $img) {
 235       my $imgpath = "$IMGROOT/$path";
 236       my $exif = new Image::ExifTool;
 237       $exif->ExtractInfo($imgpath);
 238       my $orient = $exif->GetValue("Orientation", "ValueConv");
 239       $img = $me->{img} = Image::Imlib2->load($imgpath);
 240       if (defined $orient) {
 241         my ($rot, $flip) = @{$ORIENT{$orient}};
 242         if ($rot) { $img->image_orientate($rot); }
 243         if ($flip) { $img->flip_horizontal(); }
 244       }
 245     }
 246
 247     my ($wd, $ht) = ($img->width, $img->height);
 248     my $max = $wd > $ht ? $wd : $ht;
 249     if ($max <= $sz) { return "$IMGURL/$path"; }
 250     my $sc = $sz/$max;
 251     my $scaled = $img->create_scaled_image($sc*$wd, $sc*$ht);
 252
 253     $scaled->image_set_format($ty->imlibfmt);
 254     $scaled->set_quality(90);
 255     my $new = "$TMP/t$$-$ext";
 256     make_path $TMP;
 257     $scaled->save($new);
 258     make_path $dir;
 259     rename $new, $thumb;
 260     return $thumburl;
 261   }
 262 }
 263
 264 ###--------------------------------------------------------------------------
 265 ### Directory listings.
 266
 267 package TrivGal::Item {
 268   sub new ($$) {
 269     my ($cls, $name) = @_;
 270     return bless { name => $name }, $cls;
 271   }
 272   sub name ($@) {
 273     my ($me, @args) = @_;
 274     return TrivGal::read_or_set $me, $me->{name}, @args;
 275   }
 276   sub comment ($@) {
 277     my ($me, @args) = @_;
 278     return TrivGal::read_or_set $me, $me->{comment}, @args;
 279   }
 280 }
 281
 282 export qw{listdir};
 283 sub listdir ($) {
 284   my ($path) = @_;
 285   my (@d, @f);
 286   my $ix = undef;
 287
 288   if (-f "$path/.tgal.index") {
 289     open my $f, "<", "$path/.tgal.index";
 290     my $item = undef;
 291     my $comment = undef;
 292     LINE: while (<$f>) {
 293       chomp;
 294       next LINE if /^\s*(\#|$)/;
 295       if (s/^\s+//) {
 296         die "no item" unless $item;
 297         $comment = defined $comment ? $comment . "\n" . $_ : $_;
 298       } else {
 299         if ($item && $comment) { $item->comment($comment); }
 300         my ($indexp, $name, $c) =
 301           /^ (! \s+)?                   # index flag
 302              (\S+) \s*                  # filename
 303              (\S | \S.*\S )?            # start of the comment
 304              \s*
 305              $/x;
 306         $name = urldecode $name;
 307         my $list;
 308         $item = TrivGal::Item->new($name);
 309         if ($name =~ m#/$#) {
 310           $list = \@d;
 311           die "can't index a folder" if $indexp;
 312         } else {
 313           $list = \@f;
 314           my ($dir, $base, $ext) = TrivGal::split_path $name;
 315           die "unknown image type" unless $TYPE{lc $ext};
 316           if ($indexp) {
 317             die "two index images" if defined $ix;
 318             $ix = $item;
 319           }
 320         }
 321         $comment = $c;
 322         push @$list, $item;
 323       }
 324     }
 325     if ($item && $comment) { $item->comment($comment); }
 326     close $f;
 327   } else {
 328     my $st = stat $path;
 329     unless ($st->mode&0004) { return ([], [], undef); }
 330
 331     opendir $d, $path;
 332     my @e = readdir $d;
 333     closedir $d;
 334
 335     ENT: for my $e (sort @e) {
 336       my ($dir, $base, $ext) = split_path $e;
 337       my $dotp = $e =~ /^\./;
 338       my $st = stat "$path/$e";
 339       my $list = undef;
 340       if ($dotp) { }
 341       elsif (-d $st) { $list = \@d; }
 342       elsif ($TYPE{lc $ext} && -f $st) { $list = \@f; }
 343       $list and push @$list, TrivGal::Item->new($e);
 344     }
 345     $ix = $f[0] if @f;
 346   }
 347
 348   return (\@d, \@f, $ix);
 349 }
 350
 351 export qw{contents};
 352 sub contents ($) {
 353   my ($file) = @_;
 354   my $contents = "";
 355   my $f;
 356   local $@;
 357   eval { open $f, "<", "$file"; };
 358   if ($@) {
 359     if ($@->isa("autodie::exception") && $@->errno == ENOENT)
 360       { return undef; }
 361     die $@;
 362   }
 363   while (sysread $f, $buf, 16384) { $contents .= $buf; }
 364   close $f;
 365   return $contents;
 366 }
 367
 368 export qw{find_covering_file};
 369 sub find_covering_file ($$$) {
 370   my ($top, $path, $name) = @_;
 371   for (;;) {
 372     my $stuff = contents "$top/$path/$name"; return $stuff if defined $stuff;
 373     if ($path eq "") { return undef; }
 374     if ($path =~ m#^(.*)/[^/]+/?#) { $path = $1; }
 375     else { $path = ""; }
 376   }
 377 }
 378
 379 ###----- That's all, folks --------------------------------------------------
 380
 381 clean_temp_files;
 382
 383 1;