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mimetype_test.go
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mimetype_test.go
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package mimetype
import (
"bytes"
"fmt"
"io"
"math"
"math/rand"
"mime"
"os"
"path/filepath"
"strings"
"sync"
"testing"
)
const testDataDir = "testdata"
type testcase struct {
file string
mime *MIME
expectedMIME string
// If bench is true, then this entry will be used in benchmarks.
bench bool
}
var testcases = []testcase{
{"3g2.3g2", threeG2, "video/3gpp2", true},
{"3gp.3gp", threeGP, "video/3gpp", true},
{"3mf.3mf", threemf, "application/vnd.ms-package.3dmanufacturing-3dmodel+xml", true},
{"7z.7z", sevenZ, "application/x-7z-compressed", true},
{"a.a", ar, "application/x-archive", true},
{"aac.aac", aac, "audio/aac", true},
{"aaf.aaf", aaf, "application/octet-stream", true},
{"accdb.accdb", accdb, "application/x-msaccess", true},
{"aiff.aiff", aiff, "audio/aiff", true},
{"amf.amf", amf, "application/x-amf", true},
{"amr.amr", amr, "audio/amr", true},
{"ape.ape", ape, "audio/ape", true},
{"apng.png", apng, "image/vnd.mozilla.apng", true},
{"asf.asf", asf, "video/x-ms-asf", true},
{"atom.atom", atom, "application/atom+xml", true},
{"au.au", au, "audio/basic", true},
{"avi.avi", avi, "video/x-msvideo", true},
{"avif.avif", avif, "image/avif", true},
{"avifsequence.avif", avif, "image/avif", false},
{"bmp.bmp", bmp, "image/bmp", true},
{"bpg.bpg", bpg, "image/bpg", true},
{"bz2.bz2", bz2, "application/x-bzip2", true},
{"cab.cab", cab, "application/vnd.ms-cab-compressed", true},
{"cab.is.cab", cabIS, "application/x-installshield", true},
{"class.class", class, "application/x-java-applet", true},
{"crx.crx", crx, "application/x-chrome-extension", true},
{"csv.csv", csv, "text/csv", true},
{"cpio.cpio", cpio, "application/x-cpio", true},
{"dae.dae", collada, "model/vnd.collada+xml", true},
{"dbf.dbf", dbf, "application/x-dbf", true},
{"dcm.dcm", dcm, "application/dicom", true},
{"deb.deb", deb, "application/vnd.debian.binary-package", true},
{"djvu.djvu", djvu, "image/vnd.djvu", true},
{"doc.doc", doc, "application/msword", true},
{"docx.docx", docx, "application/vnd.openxmlformats-officedocument.wordprocessingml.document", true},
{"drpm.rpm", rpm, "application/x-rpm", true},
{"dwg.1.dwg", dwg, "image/vnd.dwg", false},
{"dwg.dwg", dwg, "image/vnd.dwg", true},
{"eot.eot", eot, "application/vnd.ms-fontobject", true},
{"epub.epub", epub, "application/epub+zip", true},
{"fdf.fdf", fdf, "application/vnd.fdf", true},
{"fits.fits", fits, "application/fits", true},
{"flac.flac", flac, "audio/flac", true},
{"flv.flv", flv, "video/x-flv", true},
{"gbr.gbr", gbr, "image/x-gimp-gbr", true},
{"geojson.1.geojson", geoJSON, "application/geo+json", false},
{"geojson.geojson", geoJSON, "application/geo+json", true},
{"gif.gif", gif, "image/gif", true},
{"glb.glb", glb, "model/gltf-binary", true},
{"gml.gml", gml, "application/gml+xml", true},
{"gpx.gpx", gpx, "application/gpx+xml", true},
{"gz.gz", gzip, "application/gzip", true},
{"har.har", har, "application/json", true},
{"hdr.hdr", hdr, "image/vnd.radiance", true},
{"heic.single.heic", heic, "image/heic", true},
{"heif.heif", heif, "image/heif", true},
{"html.html", html, "text/html; charset=utf-8", true},
{"html.iso88591.html", html, "text/html; charset=iso-8859-1", false},
{"html.svg.html", html, "text/html; charset=utf-8", false},
{"html.usascii.html", html, "text/html; charset=us-ascii", false},
{"html.utf8.html", html, "text/html; charset=utf-8", false},
{"html.withbr.html", html, "text/html; charset=utf-8", false},
{"ico.ico", ico, "image/x-icon", true},
{"ics.dos.ics", iCalendar, "text/calendar", true},
{"ics.ics", iCalendar, "text/calendar", false},
{"iso88591.txt", text, "text/plain; charset=iso-8859-1", false},
{"jar.jar", jar, "application/jar", true},
{"jp2.jp2", jp2, "image/jp2", true},
{"jpf.jpf", jpx, "image/jpx", true},
{"jpg.jpg", jpg, "image/jpeg", true},
{"jpm.jpm", jpm, "image/jpm", true},
{"jxl.jxl", jxl, "image/jxl", true},
{"jxr.jxr", jxr, "image/jxr", true},
{"xpm.xpm", xpm, "image/x-xpixmap", true},
{"js.js", js, "application/javascript", true},
{"json.json", json, "application/json", true},
{"json.lowascii.json", json, "application/json", false},
// json.{int,float,string}.txt contain a single JSON value. They are valid JSON
// documents, but they should not be detected as application/json. This mimics
// the behaviour of the file utility and seems the correct thing to do.
{"json.int.txt", text, "text/plain; charset=utf-8", false},
{"json.float.txt", text, "text/plain; charset=utf-8", false},
{"json.string.txt", text, "text/plain; charset=utf-8", false},
{"kml.kml", kml, "application/vnd.google-earth.kml+xml", true},
{"lit.lit", lit, "application/x-ms-reader", true},
{"lua.lua", lua, "text/x-lua", true},
{"lz.lz", lzip, "application/lzip", true},
{"m3u.m3u", m3u, "application/vnd.apple.mpegurl", true},
{"m4a.m4a", m4a, "audio/x-m4a", true},
{"audio.mp4", aMp4, "audio/mp4", true},
{"lnk.lnk", lnk, "application/x-ms-shortcut", true},
{"mdb.mdb", mdb, "application/x-msaccess", true},
{"midi.midi", midi, "audio/midi", true},
{"mkv.mkv", mkv, "video/x-matroska", true},
{"mobi.mobi", mobi, "application/x-mobipocket-ebook", true},
{"mov.mov", quickTime, "video/quicktime", true},
{"mp3.mp3", mp3, "audio/mpeg", true},
{"mp3.v1.notag.mp3", mp3, "audio/mpeg", false},
{"mp3.v2.5.notag.mp3", mp3, "audio/mpeg", false},
{"mp3.v2.notag.mp3", mp3, "audio/mpeg", false},
{"mp4.1.mp4", mp4, "video/mp4", false},
{"mp4.mp4", mp4, "video/mp4", true},
{"mpc.mpc", musePack, "audio/musepack", true},
{"mpeg.mpeg", mpeg, "video/mpeg", true},
{"mqv.mqv", mqv, "video/quicktime", true},
{"mrc.mrc", mrc, "application/marc", true},
{"msi.msi", msi, "application/x-ms-installer", true},
{"msg.msg", msg, "application/vnd.ms-outlook", true},
{"ndjson.xl.ndjson", ndJSON, "application/x-ndjson", false},
{"ndjson.ndjson", ndJSON, "application/x-ndjson", true},
{"nes.nes", nes, "application/vnd.nintendo.snes.rom", true},
{"elfobject", elfObj, "application/x-object", true},
{"odf.odf", odf, "application/vnd.oasis.opendocument.formula", true},
{"sxc.sxc", sxc, "application/vnd.sun.xml.calc", true},
{"odg.odg", odg, "application/vnd.oasis.opendocument.graphics", true},
{"odp.odp", odp, "application/vnd.oasis.opendocument.presentation", true},
{"ods.ods", ods, "application/vnd.oasis.opendocument.spreadsheet", true},
{"odt.odt", odt, "application/vnd.oasis.opendocument.text", true},
{"ogg.oga", ogg, "audio/ogg", true},
{"ogg.ogv", ogg, "video/ogg", true},
{"ogg.spx.oga", ogg, "audio/ogg", true},
{"otf.otf", otf, "font/otf", true},
{"otg.otg", otg, "application/vnd.oasis.opendocument.graphics-template", true},
{"otp.otp", otp, "application/vnd.oasis.opendocument.presentation-template", true},
{"ots.ots", ots, "application/vnd.oasis.opendocument.spreadsheet-template", true},
{"ott.ott", ott, "application/vnd.oasis.opendocument.text-template", true},
{"odc.odc", odc, "application/vnd.oasis.opendocument.chart", true},
{"owl2.owl", owl2, "application/owl+xml", true},
{"pat.pat", pat, "image/x-gimp-pat", true},
{"pdf.pdf", pdf, "application/pdf", true},
{"php.php", php, "text/x-php", true},
{"pl.pl", perl, "text/x-perl", true},
{"png.png", png, "image/png", true},
{"ppt.ppt", ppt, "application/vnd.ms-powerpoint", true},
{"pptx.pptx", pptx, "application/vnd.openxmlformats-officedocument.presentationml.presentation", true},
{"ps.ps", ps, "application/postscript", true},
{"psd.psd", psd, "image/vnd.adobe.photoshop", true},
{"p7s_pem.p7s", p7s, "application/pkcs7-signature", true},
{"p7s_der.p7s", p7s, "application/pkcs7-signature", true},
{"pub.pub", pub, "application/vnd.ms-publisher", true},
{"py.py", python, "text/x-python", true},
{"qcp.qcp", qcp, "audio/qcelp", true},
{"rar.rar", rar, "application/x-rar-compressed", true},
{"rmvb.rmvb", rmvb, "application/vnd.rn-realmedia-vbr", true},
{"rpm.rpm", rpm, "application/x-rpm", true},
{"rss.rss", rss, "application/rss+xml", true},
{"rtf.rtf", rtf, "text/rtf", true},
{"shp.shp", shp, "application/vnd.shp", true},
{"shx.shx", shx, "application/vnd.shx", true},
{"so.so", elfLib, "application/x-sharedlib", true},
{"sqlite.sqlite", sqlite3, "application/vnd.sqlite3", true},
{"srt.srt", srt, "application/x-subrip", true},
{"svg.1.svg", svg, "image/svg+xml", false},
{"svg.svg", svg, "image/svg+xml", true},
{"swf.swf", swf, "application/x-shockwave-flash", true},
{"tar.tar", tar, "application/x-tar", true},
{"tar.gnu.tar", tar, "application/x-tar", false},
{"tar.oldgnu.tar", tar, "application/x-tar", false},
{"tar.posix.tar", tar, "application/x-tar", false},
// tar.star.tar was generated with star 1.6.
{"tar.star.tar", tar, "application/x-tar", false},
{"tar.ustar.tar", tar, "application/x-tar", false},
{"tar.v7.tar", tar, "application/x-tar", false},
// tar.v7-gnu.tar is a v7 tar archive generated with GNU tar 1.29.
{"tar.v7-gnu.tar", tar, "application/x-tar", false},
{"tcl.tcl", tcl, "text/x-tcl", true},
{"tcx.tcx", tcx, "application/vnd.garmin.tcx+xml", true},
{"tiff.tiff", tiff, "image/tiff", true},
{"tsv.tsv", tsv, "text/tab-separated-values", true},
{"ttc.ttc", ttc, "font/collection", true},
{"ttf.ttf", ttf, "font/ttf", true},
{"tzfile", tzif, "application/tzif", true},
{"utf16bebom.txt", text, "text/plain; charset=utf-16be", false},
{"utf16lebom.txt", text, "text/plain; charset=utf-16le", false},
{"utf32bebom.txt", text, "text/plain; charset=utf-32be", false},
{"utf32lebom.txt", text, "text/plain; charset=utf-32le", false},
{"utf8.txt", text, "text/plain; charset=utf-8", true},
{"utf8ctrlchars", root, "application/octet-stream", false},
{"vcf.vcf", vCard, "text/vcard", true},
{"vcf.dos.vcf", vCard, "text/vcard", false},
{"voc.voc", voc, "audio/x-unknown", true},
{"vtt.vtt", vtt, "text/vtt", true},
{"vtt.space.vtt", vtt, "text/vtt", false},
{"vtt.tab.vtt", vtt, "text/vtt", false},
{"vtt.eof.vtt", vtt, "text/vtt", false},
{"warc.warc", warc, "application/warc", true},
{"wasm.wasm", wasm, "application/wasm", true},
{"wav.wav", wav, "audio/wav", true},
{"webm.webm", webM, "video/webm", true},
{"webp.webp", webp, "image/webp", true},
{"woff.woff", woff, "font/woff", true},
{"woff2.woff2", woff2, "font/woff2", true},
{"x3d.x3d", x3d, "model/x3d+xml", true},
{"xar.xar", xar, "application/x-xar", true},
{"xcf.xcf", xcf, "image/x-xcf", true},
{"xfdf.xfdf", xfdf, "application/vnd.adobe.xfdf", true},
{"xlf.xlf", xliff, "application/x-xliff+xml", true},
{"xls.xls", xls, "application/vnd.ms-excel", true},
{"xlsx.xlsx", xlsx, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", true},
{"xml.xml", xml, "text/xml; charset=utf-8", true},
{"xml.withbr.xml", xml, "text/xml; charset=utf-8", false},
{"xz.xz", xz, "application/x-xz", true},
{"zip.zip", zip, "application/zip", true},
{"zst.zst", zstd, "application/zstd", true},
}
func TestDetect(t *testing.T) {
errStr := "File: %s; Expected: %s != Detected: %s; err: %v"
extStr := "File: %s; ExpectedExt: %s != DetectedExt: %s"
for _, tc := range testcases {
fileName := filepath.Join(testDataDir, tc.file)
f, err := os.Open(fileName)
if err != nil {
t.Fatal(err)
}
data, err := io.ReadAll(f)
if err != nil {
t.Fatal(err)
}
if mtype := Detect(data); mtype.String() != tc.expectedMIME {
t.Errorf(errStr, tc.file, tc.expectedMIME, mtype.String(), nil)
}
if _, err := f.Seek(0, io.SeekStart); err != nil {
t.Fatal(err)
}
if mtype, err := DetectReader(f); mtype.String() != tc.expectedMIME {
t.Errorf(errStr, tc.file, tc.expectedMIME, mtype.String(), err)
}
f.Close()
if mtype, err := DetectFile(fileName); mtype.String() != tc.expectedMIME {
t.Errorf(errStr, tc.file, tc.expectedMIME, mtype.String(), err)
} else if mtype.Extension() != filepath.Ext(tc.file) {
t.Errorf(extStr, tc.file, filepath.Ext(tc.file), mtype.Extension())
}
}
}
// This test generates the doc file containing the table with the supported MIMEs.
func TestGenerateSupportedFormats(t *testing.T) {
f, err := os.OpenFile("supported_mimes.md", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
t.Fatal(err)
}
defer f.Close()
nodes := root.flatten()
header := fmt.Sprintf(`## %d Supported MIME types
This file is automatically generated when running tests. Do not edit manually.
Extension | MIME type | Aliases
--------- | --------- | -------
`, len(nodes))
if _, err := f.WriteString(header); err != nil {
t.Fatal(err)
}
for _, n := range nodes {
ext := n.extension
if ext == "" {
ext = "n/a"
}
aliases := strings.Join(n.aliases, ", ")
if aliases == "" {
aliases = "-"
}
str := fmt.Sprintf("**%s** | %s | %s\n", ext, n.mime, aliases)
if _, err := f.WriteString(str); err != nil {
t.Fatal(err)
}
}
}
func TestEqualsAny(t *testing.T) {
type ss []string
testCases := []struct {
m1 string
m2 ss
res bool
}{
{"foo/bar", ss{"foo/bar"}, true},
{" foo/bar", ss{"foo/bar "}, true}, // whitespace
{" foo/bar", ss{"foo/BAR "}, true}, // case
{" foo/bar", ss{"foo/baz"}, false},
{";charset=utf-8", ss{""}, true},
{"", ss{"", "foo/bar"}, true},
{"foo/bar", ss{""}, false},
{"foo/bar", nil, false},
}
for _, tc := range testCases {
if EqualsAny(tc.m1, tc.m2...) != tc.res {
t.Errorf("Equality test failed for %+v", tc)
}
}
}
func TestDetectReader(t *testing.T) {
errStr := "File: %s; Mime: %s != DetectedMime: %s; err: %v"
for _, tc := range testcases {
fileName := filepath.Join(testDataDir, tc.file)
f, err := os.Open(fileName)
if err != nil {
t.Fatal(err)
}
r := breakReader{
r: f,
breakSize: 3,
}
if mtype, err := DetectReader(&r); mtype.String() != tc.expectedMIME {
t.Errorf(errStr, tc.file, tc.expectedMIME, mtype.String(), err)
}
f.Close()
}
}
// breakReader breaks the string every breakSize characters.
// It is like:
//
// <html><h
// ead><tit
// le>html<
// ...
type breakReader struct {
r io.Reader
breakSize int
}
func (b *breakReader) Read(p []byte) (int, error) {
if len(p) > b.breakSize {
p = p[:b.breakSize]
}
n, err := io.ReadFull(b.r, p)
if err == io.ErrUnexpectedEOF {
return n, io.EOF
}
return n, err
}
func TestFaultyInput(t *testing.T) {
inexistent := "inexistent.file"
if mtype, err := DetectFile(inexistent); err == nil {
t.Errorf("%s should not match successfully", inexistent)
} else if mtype.String() != "application/octet-stream" {
t.Errorf("inexistent.file expected application/octet-stream, got %s", mtype)
}
f, _ := os.Open(inexistent)
if mtype, err := DetectReader(f); err == nil {
t.Errorf("%s reader should not match successfully", inexistent)
} else if mtype.String() != "application/octet-stream" {
t.Errorf("inexistent.file reader expected application/octet-stream, got %s", mtype)
}
}
func TestHierarchy(t *testing.T) {
detectedMIME, err := DetectFile("testdata/html.html")
if err != nil {
t.Fatal(err)
}
expected := []string{
"text/html; charset=utf-8",
"text/plain",
"application/octet-stream",
}
got := []string{}
for mtype := detectedMIME; mtype != nil; mtype = mtype.Parent() {
got = append(got, mtype.String())
}
if le, lg := len(expected), len(got); le != lg {
t.Fatalf("hierarchy len error; expected: %d, got: %d", le, lg)
}
for i := range expected {
if expected[i] != got[i] {
t.Fatalf("hierarchy error; expected: %s, got: %s", expected, got)
}
}
}
func TestConcurrent(t *testing.T) {
wg := sync.WaitGroup{}
wg.Add(4)
Extend(func([]byte, uint32) bool { return false }, "e", ".e")
go func() {
for i := 0; i < 1000; i++ {
Detect([]byte("text content"))
}
wg.Done()
}()
go func() {
for i := 0; i < 1000; i++ {
SetLimit(5000 + uint32(i))
}
wg.Done()
}()
go func() {
for i := 0; i < 1000; i++ {
Lookup("text/plain")
}
wg.Done()
}()
go func() {
for i := 0; i < 1000; i++ {
Lookup("e").Extend(func([]byte, uint32) bool { return false }, "e", ".e")
}
wg.Done()
}()
wg.Wait()
// Reset to original limit for benchmarks.
SetLimit(defaultLimit)
}
// For #162.
func TestEmptyInput(t *testing.T) {
mtype, err := DetectReader(bytes.NewReader(nil))
if err != nil {
t.Fatalf("empty reader err; expected: nil, got: %s", err)
}
plain := "text/plain"
if !mtype.Is(plain) {
t.Fatalf("empty reader detection; expected: %s, got: %s", plain, mtype)
}
mtype = Detect(nil)
if !mtype.Is(plain) {
t.Fatalf("empty bytes slice detection; expected: %s, got: %s", plain, mtype)
}
SetLimit(0)
mtype, err = DetectReader(bytes.NewReader(nil))
if err != nil {
t.Fatalf("0 limіt, empty reader err; expected: nil, got: %s", err)
}
if !mtype.Is(plain) {
t.Fatalf("0 limit, empty reader detection; expected: %s, got: %s", plain, mtype)
}
SetLimit(defaultLimit)
}
func BenchmarkAll(b *testing.B) {
r := rand.New(rand.NewSource(0))
// randData is used for the negative case benchmark.
randData := make([]byte, defaultLimit)
if _, err := io.ReadFull(r, randData); err != io.ErrUnexpectedEOF && err != nil {
b.Fatal(err)
}
for _, tc := range testcases {
if !tc.bench {
continue
}
// data is used for the positive case benchmark.
data, err := os.ReadFile(filepath.Join(testDataDir, tc.file))
if err != nil {
b.Fatal(err)
}
b.Run(tc.file, func(b *testing.B) {
b.ReportAllocs()
for n := 0; n < b.N; n++ {
if !tc.mime.detector(data, defaultLimit) {
b.Fatalf("positive detection should never fail; file=%s", tc.file)
}
if tc.mime.detector(randData, defaultLimit) {
b.Fatalf("negative detection should always fail; file=%s", tc.file)
}
}
})
}
}
// Check there are no panics for nil inputs.
func TestIndexOutOfRangePanic(t *testing.T) {
for _, n := range root.flatten() {
n.detector(nil, 1<<10)
}
}
// MIME type equality ignores any optional MIME parameters, so, in order to not
// parse each alias when testing for equality, we must ensure they are
// registered with no parameters.
func TestMIMEFormat(t *testing.T) {
for _, n := range root.flatten() {
// All extensions must be dot prefixed so they are compatible
// with the stdlib mime package.
if n.Extension() != "" && !strings.HasPrefix(n.Extension(), ".") {
t.Fatalf("extension %s should be dot prefixed", n.Extension())
}
// All MIMEs must be correctly formatted.
_, _, err := mime.ParseMediaType(n.String())
if err != nil {
t.Fatalf("error parsing node MIME: %s", err)
}
// Aliases must have no optional MIME parameters.
for _, a := range n.aliases {
parsed, params, err := mime.ParseMediaType(a)
if err != nil {
t.Fatalf("error parsing node alias MIME: %s", err)
}
if parsed != a || len(params) > 0 {
t.Fatalf("node alias MIME should have no optional params; alias: %s, params: %v", a, params)
}
}
}
}
func TestLookup(t *testing.T) {
data := []struct {
mime string
m *MIME
}{
{root.mime, root},
{zip.mime, zip},
{zip.aliases[0], zip},
{xlsx.mime, xlsx},
}
for _, tt := range data {
t.Run(fmt.Sprintf("lookup %s", tt.mime), func(t *testing.T) {
if m := Lookup(tt.mime); m != tt.m {
t.Fatalf("failed to lookup: %s", tt.mime)
}
})
}
}
func TestExtend(t *testing.T) {
data := []struct {
mime string
ext string
parent *MIME
}{
{"foo", ".foo", nil},
{"bar", ".bar", root},
{"baz", ".baz", zip},
}
for _, tt := range data {
t.Run(fmt.Sprintf("extending to %s", tt.mime), func(t *testing.T) {
extend := Extend
if tt.parent != nil {
extend = tt.parent.Extend
} else {
tt.parent = root
}
extend(func(raw []byte, limit uint32) bool { return false }, tt.mime, tt.ext)
m := Lookup(tt.mime)
if m == nil {
t.Fatalf("mime %s not found", tt.mime)
}
if m.parent != tt.parent {
t.Fatalf("mime %s has wrong parent: want %s, got %s", tt.mime, tt.parent.mime, m.parent.mime)
}
})
}
}
// Because of the random nature of fuzzing I don't think there is a way to test
// the correctness of the Detect results. Still there is value in fuzzing in
// search for panics.
func FuzzMimetype(f *testing.F) {
// Some of the more interesting file formats. Most formats are detected by
// checking some magic numbers in headers, but these have more complicated
// detection algorithms.
corpus := []string{
"testdata/mkv.mkv",
"testdata/webm.webm",
"testdata/docx.docx",
"testdata/pptx.pptx",
"testdata/xlsx.xlsx",
"testdata/3gp.3gp",
"testdata/class.class",
}
for _, c := range corpus {
data, err := os.ReadFile(c)
if err != nil {
f.Fatal(err)
}
f.Add(data[:100])
}
// First node is root. Remove it because it matches any input.
detectors := root.flatten()[1:]
f.Fuzz(func(t *testing.T, data []byte) {
matched := false
for _, d := range detectors {
if d.detector(data, math.MaxUint32) {
matched = true
}
}
if !matched {
t.Skip()
}
})
}