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