|
| 1 | +require "test_helper" |
| 2 | +require "vips" |
| 3 | +require "tempfile" |
| 4 | + |
| 5 | +# libvips selects a loader from a file's actual bytes, not from its declared content type. These |
| 6 | +# tests pin which loader is selected for each file type under the app's configured loader policy |
| 7 | +# (config/initializers/vips.rb). |
| 8 | +class VipsLoaderPolicyTest < ActiveSupport::TestCase |
| 9 | + # Header bytes are enough for libvips to identify a format; native types are encoded live, exotic |
| 10 | + # ones are represented by their magic bytes. |
| 11 | + FTYP_AVIF = "\x00\x00\x00\x1cftypavif\x00\x00\x00\x00avifmif1miaf".b |
| 12 | + FTYP_HEIC = "\x00\x00\x00\x1cftypheic\x00\x00\x00\x00heicmif1miaf".b |
| 13 | + BMP = "BM" + [ 0, 0, 54 ].pack("V3") + "\x00" * 40 |
| 14 | + PSD = "8BPS" + [ 1 ].pack("n") + "\x00" * 26 |
| 15 | + ICO = "\x00\x00\x01\x00\x01\x00" + "\x00" * 16 |
| 16 | + SVG = %q(<svg xmlns="http://www.w3.org/2000/svg" width="8" height="8"/>) |
| 17 | + |
| 18 | + test "loads PNG" do |
| 19 | + assert_equal "VipsForeignLoadPngFile", loader_for(encode("png")) |
| 20 | + end |
| 21 | + |
| 22 | + test "loads GIF" do |
| 23 | + assert_equal "VipsForeignLoadNsgifFile", loader_for(encode("gif")) |
| 24 | + end |
| 25 | + |
| 26 | + test "loads JPEG" do |
| 27 | + assert_equal "VipsForeignLoadJpegFile", loader_for(encode("jpg")) |
| 28 | + end |
| 29 | + |
| 30 | + test "loads TIFF" do |
| 31 | + assert_equal "VipsForeignLoadTiffFile", loader_for(encode("tif")) |
| 32 | + end |
| 33 | + |
| 34 | + test "loads WebP" do |
| 35 | + assert_equal "VipsForeignLoadWebpFile", loader_for(encode("webp")) |
| 36 | + end |
| 37 | + |
| 38 | + test "loads AVIF" do |
| 39 | + assert_equal "VipsForeignLoadHeifFile", loader_for(FTYP_AVIF) |
| 40 | + end |
| 41 | + |
| 42 | + test "loads HEIC" do |
| 43 | + assert_equal "VipsForeignLoadHeifFile", loader_for(FTYP_HEIC) |
| 44 | + end |
| 45 | + |
| 46 | + test "denies BMP through magickload" do |
| 47 | + assert_nil loader_for(BMP) |
| 48 | + end |
| 49 | + |
| 50 | + test "denies PSD through magickload" do |
| 51 | + assert_nil loader_for(PSD) |
| 52 | + end |
| 53 | + |
| 54 | + test "denies ICO through magickload" do |
| 55 | + assert_nil loader_for(ICO) |
| 56 | + end |
| 57 | + |
| 58 | + test "denies SVG through svgload" do |
| 59 | + assert_nil loader_for(SVG) |
| 60 | + end |
| 61 | + |
| 62 | + test "denies OpenSlide files through openslideload" do |
| 63 | + # OpenSlide files can segfault the embedded sqlite in forked parallel workers |
| 64 | + assert_loader_blocked :openslideload, ".svs" |
| 65 | + end |
| 66 | + |
| 67 | + test "denies FITS files through fitsload" do |
| 68 | + assert_loader_blocked :fitsload, ".fits" |
| 69 | + end |
| 70 | + |
| 71 | + test "denies MATLAB files through matload" do |
| 72 | + assert_loader_blocked :matload, ".mat" |
| 73 | + end |
| 74 | + |
| 75 | + test "denies NIFTI files through niftiload" do |
| 76 | + assert_loader_blocked :niftiload, ".nii" |
| 77 | + end |
| 78 | + |
| 79 | + test "denies RAW files through dcrawload" do |
| 80 | + assert_loader_blocked :dcrawload, ".raw" |
| 81 | + end |
| 82 | + |
| 83 | + test "denies VIPS files through vipsload" do |
| 84 | + assert_loader_blocked :vipsload, ".vips" |
| 85 | + end |
| 86 | + |
| 87 | + private |
| 88 | + # Invoke a specific libvips loader directly and assert it is refused because the |
| 89 | + # operation is blocked (rather than because the bytes are not a valid image). |
| 90 | + def assert_loader_blocked(operation, extension) |
| 91 | + Tempfile.create([ "blocked_loader", extension ], binmode: true) do |file| |
| 92 | + file.write "not an image" |
| 93 | + file.flush |
| 94 | + |
| 95 | + error = assert_raises(Vips::Error) { Vips::Image.public_send(operation, file.path) } |
| 96 | + actual = error.message.chomp |
| 97 | + |
| 98 | + # note that exception message may include multiple errors on separate lines, |
| 99 | + # so `^` and `$` anchors are used instead of `\A` and `\z`. |
| 100 | + if actual =~ /^VipsOperation: class \"#{operation}\" not found$/ |
| 101 | + skip "libvips does not support #{operation} on this system" |
| 102 | + end |
| 103 | + assert_match(/^#{operation}: operation is blocked$/, actual) |
| 104 | + end |
| 105 | + end |
| 106 | + |
| 107 | + def encode(ext) |
| 108 | + Vips::Image.black(8, 8).add(128).cast("uchar").write_to_buffer(".#{ext}") |
| 109 | + end |
| 110 | + |
| 111 | + def loader_for(bytes) |
| 112 | + Tempfile.create(%w[loader_probe .img], binmode: true) do |file| |
| 113 | + file.write bytes |
| 114 | + file.flush |
| 115 | + Vips.vips_foreign_find_load(file.path) |
| 116 | + end |
| 117 | + end |
| 118 | +end |
0 commit comments