Tests: image_filter_max_pixels directive

image_filter_max_pixels.t

@@ -0,0 +1,104 @@
+#!/usr/bin/perl
+
+# (C) Nginx, Inc.
+
+# Tests for the image_filter_max_pixels directive.
+
+###############################################################################
+
+use warnings;
+use strict;
+
+use Test::More;
+
+BEGIN { use FindBin; chdir($FindBin::Bin); }
+
+use lib 'lib';
+use Test::Nginx;
+
+###############################################################################
+
+select STDERR; $| = 1;
+select STDOUT; $| = 1;
+
+eval { require GD; };
+plan(skip_all => 'GD not installed') if $@;
+
+my $t = Test::Nginx->new()->has(qw/http image_filter/)
+	->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    server {
+        listen       127.0.0.1:8080;
+        server_name  localhost;
+
+        location /allow {
+            image_filter resize 50 50;
+            image_filter_max_pixels 40000;
+            alias %%TESTDIR%%/;
+        }
+
+        location /deny {
+            image_filter resize 50 50;
+            image_filter_max_pixels 5000;
+            alias %%TESTDIR%%/;
+        }
+
+        location /off {
+            image_filter resize 50 50;
+            image_filter_max_pixels 0;
+            alias %%TESTDIR%%/;
+        }
+    }
+}
+
+EOF
+
+# a 100x100 (10000 pixel) source image
+
+my $im = new GD::Image(100, 100);
+my $white = $im->colorAllocate(255, 255, 255);
+my $black = $im->colorAllocate(0, 0, 0);
+$im->rectangle(0, 0, 99, 99, $black);
+$t->write_file('img.png', $im->png);
+
+# a source whose true width exceeds 16 bits (65540 x 2 = 131080 pixels).
+# PNG stores width and height in 32-bit fields; reading only their low 16
+# bits would understate 65540 as 4 and let the 131080-pixel canvas slip past
+# the limit.
+
+my $wide = new GD::Image(65540, 2);
+$wide->colorAllocate(255, 255, 255);
+$t->write_file('wide.png', $wide->png);
+
+$t->try_run('no image_filter_max_pixels')->plan(4);
+
+###############################################################################
+
+# source pixels below the limit are processed
+
+like(http_get('/allow/img.png'), qr/200 OK/, 'below limit');
+
+# source pixels above the limit are rejected
+
+like(http_get('/deny/img.png'), qr/ 415 /, 'above limit');
+
+# zero disables the limit
+
+like(http_get('/off/img.png'), qr/200 OK/, 'limit disabled');
+
+# a source whose true dimensions exceed 16 bits must be measured in full,
+# not understated by reading only the low 16 bits of the PNG size fields
+
+like(http_get('/deny/wide.png'), qr/ 415 /, 'wide source above limit');
+
+###############################################################################