X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/950137eb6c4b5a75a01724736423e41ab3896e45..f282512da75d19e38933f3083afa3c2a9dad463c:/IkiWiki/Plugin/img.pm

diff --git a/IkiWiki/Plugin/img.pm b/IkiWiki/Plugin/img.pm
index d295b833b..ed2e9354d 100644
--- a/IkiWiki/Plugin/img.pm
+++ b/IkiWiki/Plugin/img.pm
@@ -19,13 +19,40 @@ sub getsetup () {
 		plugin => {
 			safe => 1,
 			rebuild => undef,
+			section => "widget",
+		},
+		img_allowed_formats => {
+			type => "string",
+			default => [qw(jpeg png gif)],
+			description => "Image formats to process (jpeg, png, gif, pdf, svg or 'everything' to accept all)",
+			# ImageMagick has had arbitrary code execution flaws,
+			# and the whole delegates mechanism is scary from
+			# that perspective
+			safe => 0,
+			rebuild => 0,
 		},
 }
 
+sub allowed {
+	my $format = shift;
+	my $allowed = $config{img_allowed_formats};
+	$allowed = ['jpeg', 'png'] unless defined $allowed && @$allowed;
+
+	foreach my $a (@$allowed) {
+		return 1 if $a eq $format || $a eq 'everything';
+	}
+
+	return 0;
+}
+
 sub preprocess (@) {
 	my ($image) = $_[0] =~ /$config{wiki_file_regexp}/; # untaint
 	my %params=@_;
 
+	if (! defined $image) {
+		error("bad image filename");
+	}
+
 	if (exists $imgdefaults{$params{page}}) {
 		foreach my $key (keys %{$imgdefaults{$params{page}}}) {
 			if (! exists $params{$key}) {
@@ -34,7 +61,7 @@ sub preprocess (@) {
 		}
 	}
 
-	if (! exists $params{size}) {
+	if (! exists $params{size} || ! length $params{size}) {
 		$params{size}='full';
 	}
 
@@ -43,7 +70,9 @@ sub preprocess (@) {
 		return '';
 	}
 
-	push @{$links{$params{page}}}, $image;
+	add_link($params{page}, $image);
+	add_depends($params{page}, $image);
+
 	# optimisation: detect scan mode, and avoid generating the image
 	if (! defined wantarray) {
 		return;
@@ -57,91 +86,209 @@ sub preprocess (@) {
 
 	my $dir = $params{page};
 	my $base = IkiWiki::basename($file);
+	my $extension;
+	my $format;
+
+	if ($base =~ m/\.([a-z0-9]+)$/) {
+		$extension = $1;
+	}
+	else {
+		error gettext("Unable to detect image type from extension");
+	}
+
+	# Never interpret well-known file extensions as any other format,
+	# in case the wiki configuration unwisely allows attaching
+	# arbitrary files named *.jpg, etc.
+	my $magic;
+	my $offset = 0;
+	open(my $in, '<', $srcfile) or error sprintf(gettext("failed to read %s: %s"), $file, $!);
+	binmode($in);
+
+	if ($extension =~ m/^(jpeg|jpg)$/is) {
+		$format = 'jpeg';
+		$magic = "\377\330\377";
+	}
+	elsif ($extension =~ m/^(png)$/is) {
+		$format = 'png';
+		$magic = "\211PNG\r\n\032\n";
+	}
+	elsif ($extension =~ m/^(gif)$/is) {
+		$format = 'gif';
+		$magic = "GIF8";
+	}
+	elsif ($extension =~ m/^(svg)$/is) {
+		$format = 'svg';
+	}
+	elsif ($extension =~ m/^(pdf)$/is) {
+		$format = 'pdf';
+		$magic = "%PDF-";
+	}
+	else {
+		# allow ImageMagick to auto-detect (potentially dangerous)
+		$format = '';
+	}
+
+	error sprintf(gettext("%s image processing disabled in img_allowed_formats configuration"), $format ? $format : "\"$extension\"") unless allowed($format ? $format : "everything");
+
+	# Try harder to protect ImageMagick from itself
+	if ($format eq 'svg') {
+		my $content;
+		read($in, $content, 5) or error sprintf(gettext("failed to read %s: %s"), $file, $!);
+		# This is an over-simplification, but ?xml is the check that
+		# ImageMagick uses. We also accept <svg for the simplest
+		# possible SVGs.
+		if ($content !~ m/^(.\?xml|<svg)/is) {
+			error sprintf(gettext("\"%s\" does not seem to be a valid %s file"), $file, $format);
+		}
+	}
+	elsif ($magic) {
+		my $content;
+		read($in, $content, length $magic) or error sprintf(gettext("failed to read %s: %s"), $file, $!);
+		if ($magic ne $content) {
+			error sprintf(gettext("\"%s\" does not seem to be a valid %s file"), $file, $format);
+		}
+	}
+
+	my $issvg = $base=~s/\.svg$/.png/i;
+	my $ispdf = $base=~s/\.pdf$/.png/i;
+	my $pagenumber = exists($params{pagenumber}) ? int($params{pagenumber}) : 0;
+	if ($pagenumber != 0) {
+		$base = "p$pagenumber-$base";
+	}
 
 	eval q{use Image::Magick};
 	error gettext("Image::Magick is not installed") if $@;
-	my $im = Image::Magick->new;
+	my $im = Image::Magick->new();
 	my $imglink;
-	my $r;
+	my $imgdatalink;
+	my $r = $im->Read("$format:$srcfile\[$pagenumber]");
+	error sprintf(gettext("failed to read %s: %s"), $file, $r) if $r;
+
+	if (! defined $im->Get("width") || ! defined $im->Get("height")) {
+		error sprintf(gettext("failed to get dimensions of %s"), $file);
+	}
 
-	if ($params{size} ne 'full') {
+	my ($dwidth, $dheight);
+
+	if ($params{size} eq 'full') {
+		$dwidth = $im->Get("width");
+		$dheight = $im->Get("height");
+	} else {
 		my ($w, $h) = ($params{size} =~ /^(\d*)x(\d*)$/);
-		error sprintf(gettext('bad size "%s"'), $params{size})
+		error sprintf(gettext('wrong size format "%s" (should be WxH)'), $params{size})
 			unless (defined $w && defined $h &&
 			        (length $w || length $h));
 
-		my $outfile = "$config{destdir}/$dir/${w}x${h}-$base";
-		$imglink = "$dir/${w}x${h}-$base";
-		
+		if ($im->Get("width") == 0 || $im->Get("height") == 0) {
+			($dwidth, $dheight)=(0, 0);
+		} elsif (! length $w || (length $h && $im->Get("height")*$w > $h * $im->Get("width"))) {
+			# using height because only height is given or ...
+			# because original image is more portrait than $w/$h
+			# ... slimness of $im > $h/w
+			# ... $im->Get("height")/$im->Get("width") > $h/$w
+			# ... $im->Get("height")*$w > $h * $im->Get("width")
+
+			$dheight=$h;
+			$dwidth=$h / $im->Get("height") * $im->Get("width");
+		} else { # (! length $h) or $w is what determines the resized size
+			$dwidth=$w;
+			$dheight=$w / $im->Get("width") * $im->Get("height");
+		}
+	}
+
+	if ($dwidth < $im->Get("width") || $ispdf) {
+		# resize down, or resize to pixels at all
+
+		my $outfile = "$config{destdir}/$dir/$params{size}-$base";
+		$imglink = "$dir/$params{size}-$base";
+
 		will_render($params{page}, $imglink);
 
 		if (-e $outfile && (-M $srcfile >= -M $outfile)) {
+			$im = Image::Magick->new;
 			$r = $im->Read($outfile);
 			error sprintf(gettext("failed to read %s: %s"), $outfile, $r) if $r;
 		}
 		else {
-			$r = $im->Read($srcfile);
-			error sprintf(gettext("failed to read %s: %s"), $file, $r) if $r;
-
-			$r = $im->Resize(geometry => "${w}x${h}");
+			$r = $im->Resize(geometry => "${dwidth}x${dheight}");
 			error sprintf(gettext("failed to resize: %s"), $r) if $r;
 
-			# don't actually write file in preview mode
+			$im->set(($issvg || $ispdf) ? (magick => 'png') : ());
+			my @blob = $im->ImageToBlob();
+			# don't actually write resized file in preview mode;
+			# rely on width and height settings
 			if (! $params{preview}) {
-				my @blob = $im->ImageToBlob();
 				writefile($imglink, $config{destdir}, $blob[0], 1);
 			}
 			else {
-				$imglink = $file;
+				eval q{use MIME::Base64};
+				error($@) if $@;
+				$imgdatalink = "data:image/".$im->Get("magick").";base64,".encode_base64($blob[0]);
 			}
 		}
-	}
-	else {
-		$r = $im->Read($srcfile);
-		error sprintf(gettext("failed to read %s: %s"), $file, $r) if $r;
+
+		# always get the true size of the resized image (it could be
+		# that imagemagick did its calculations differently)
+		$dwidth  = $im->Get("width");
+		$dheight = $im->Get("height");
+	} else {
 		$imglink = $file;
 	}
-
-	add_depends($imglink, $params{page});
+	
+	if (! defined($dwidth) || ! defined($dheight)) {
+		error sprintf(gettext("failed to determine size of image %s"), $file)
+	}
 
 	my ($fileurl, $imgurl);
-	if (! $params{preview}) {
-		$fileurl=urlto($file, $params{destpage});
-		$imgurl=urlto($imglink, $params{destpage});
-	}
-	else {
-		$fileurl="$config{url}/$file";
-		$imgurl="$config{url}/$imglink";
-	}
+	my $urltobase = $params{preview} ? undef : $params{destpage};
+	$fileurl=urlto($file, $urltobase);
+	$imgurl=$imgdatalink ? $imgdatalink : urlto($imglink, $urltobase);
 
-	if (! defined($im->Get("width")) || ! defined($im->Get("height"))) {
-		error sprintf(gettext("failed to determine size of image %s"), $file)
+	if (! exists $params{class}) {
+		$params{class}="img";
 	}
 
+	my $attrs='';
+	foreach my $attr (qw{alt title class id hspace vspace}) {
+		if (exists $params{$attr}) {
+			$attrs.=" $attr=\"$params{$attr}\"";
+		}
+	}
+	
 	my $imgtag='<img src="'.$imgurl.
-		'" width="'.$im->Get("width").
-		'" height="'.$im->Get("height").'"'.
-		(exists $params{alt} ? '" alt="'.$params{alt}.'"' : '').
-		(exists $params{title} ? ' title="'.$params{title}.'"' : '').
-		(exists $params{class} ? ' class="'.$params{class}.'"' : '').
-		(exists $params{id} ? ' id="'.$params{id}.'"' : '').
+		'" width="'.$dwidth.
+		'" height="'.$dheight.'"'.
+		$attrs.
+		(exists $params{align} && ! exists $params{caption} ? ' align="'.$params{align}.'"' : '').
 		' />';
 
-	if (! defined $params{link} || lc($params{link}) eq 'yes') {
-		$imgtag='<a href="'.$fileurl.'">'.$imgtag.'</a>';
+	my $link;
+	if (! defined $params{link}) {
+		$link=$fileurl;
 	}
 	elsif ($params{link} =~ /^\w+:\/\//) {
-		$imgtag='<a href="'.$params{link}.'">'.$imgtag.'</a>';
+		$link=$params{link};
 	}
-	elsif (length bestlink($params{page}, $params{link})) {
-		add_depends($params{page}, $params{link});
-		$imgtag=htmllink($params{page}, $params{destpage},
-			$params{link}, linktext => $imgtag,
-			noimageinline => 1);
+
+	if (defined $link) {
+		$imgtag='<a href="'.$link.'">'.$imgtag.'</a>';
+	}
+	else {
+		my $b = bestlink($params{page}, $params{link});
+	
+		if (length $b) {
+			add_depends($params{page}, $b, deptype("presence"));
+			$imgtag=htmllink($params{page}, $params{destpage},
+				$params{link}, linktext => $imgtag,
+				noimageinline => 1,
+			);
+		}
 	}
 
 	if (exists $params{caption}) {
-		return '<table class="img">'.
+		return '<table class="img'.
+			(exists $params{align} ? " align-$params{align}" : "").
+			'">'.
 			'<caption>'.$params{caption}.'</caption>'.
 			'<tr><td>'.$imgtag.'</td></tr>'.
 			'</table>';