810 lines
16 KiB
JavaScript
810 lines
16 KiB
JavaScript
'use strict';
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const toBytes = s => [...s].map(c => c.charCodeAt(0));
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const xpiZipFilename = toBytes('META-INF/mozilla.rsa');
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const oxmlContentTypes = toBytes('[Content_Types].xml');
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const oxmlRels = toBytes('_rels/.rels');
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module.exports = input => {
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const buf = input instanceof Uint8Array ? input : new Uint8Array(input);
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if (!(buf && buf.length > 1)) {
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return null;
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}
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const check = (header, options) => {
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options = Object.assign({
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offset: 0
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}, options);
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for (let i = 0; i < header.length; i++) {
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// If a bitmask is set
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if (options.mask) {
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// If header doesn't equal `buf` with bits masked off
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if (header[i] !== (options.mask[i] & buf[i + options.offset])) {
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return false;
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}
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} else if (header[i] !== buf[i + options.offset]) {
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return false;
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}
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}
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return true;
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};
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const checkString = (header, options) => check(toBytes(header), options);
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if (check([0xFF, 0xD8, 0xFF])) {
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return {
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ext: 'jpg',
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mime: 'image/jpeg'
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};
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}
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if (check([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A])) {
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return {
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ext: 'png',
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mime: 'image/png'
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};
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}
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if (check([0x47, 0x49, 0x46])) {
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return {
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ext: 'gif',
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mime: 'image/gif'
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};
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}
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if (check([0x57, 0x45, 0x42, 0x50], {offset: 8})) {
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return {
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ext: 'webp',
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mime: 'image/webp'
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};
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}
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if (check([0x46, 0x4C, 0x49, 0x46])) {
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return {
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ext: 'flif',
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mime: 'image/flif'
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};
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}
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// Needs to be before `tif` check
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if (
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(check([0x49, 0x49, 0x2A, 0x0]) || check([0x4D, 0x4D, 0x0, 0x2A])) &&
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check([0x43, 0x52], {offset: 8})
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) {
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return {
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ext: 'cr2',
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mime: 'image/x-canon-cr2'
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};
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}
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if (
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check([0x49, 0x49, 0x2A, 0x0]) ||
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check([0x4D, 0x4D, 0x0, 0x2A])
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) {
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return {
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ext: 'tif',
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mime: 'image/tiff'
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};
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}
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if (check([0x42, 0x4D])) {
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return {
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ext: 'bmp',
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mime: 'image/bmp'
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};
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}
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if (check([0x49, 0x49, 0xBC])) {
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return {
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ext: 'jxr',
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mime: 'image/vnd.ms-photo'
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};
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}
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if (check([0x38, 0x42, 0x50, 0x53])) {
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return {
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ext: 'psd',
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mime: 'image/vnd.adobe.photoshop'
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};
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}
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// Zip-based file formats
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// Need to be before the `zip` check
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if (check([0x50, 0x4B, 0x3, 0x4])) {
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if (
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check([0x6D, 0x69, 0x6D, 0x65, 0x74, 0x79, 0x70, 0x65, 0x61, 0x70, 0x70, 0x6C, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6F, 0x6E, 0x2F, 0x65, 0x70, 0x75, 0x62, 0x2B, 0x7A, 0x69, 0x70], {offset: 30})
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) {
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return {
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ext: 'epub',
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mime: 'application/epub+zip'
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};
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}
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// Assumes signed `.xpi` from addons.mozilla.org
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if (check(xpiZipFilename, {offset: 30})) {
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return {
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ext: 'xpi',
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mime: 'application/x-xpinstall'
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};
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}
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if (checkString('mimetypeapplication/vnd.oasis.opendocument.text', {offset: 30})) {
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return {
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ext: 'odt',
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mime: 'application/vnd.oasis.opendocument.text'
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};
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}
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if (checkString('mimetypeapplication/vnd.oasis.opendocument.spreadsheet', {offset: 30})) {
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return {
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ext: 'ods',
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mime: 'application/vnd.oasis.opendocument.spreadsheet'
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};
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}
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if (checkString('mimetypeapplication/vnd.oasis.opendocument.presentation', {offset: 30})) {
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return {
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ext: 'odp',
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mime: 'application/vnd.oasis.opendocument.presentation'
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};
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}
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// https://github.com/file/file/blob/master/magic/Magdir/msooxml
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if (check(oxmlContentTypes, {offset: 30}) || check(oxmlRels, {offset: 30})) {
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const sliced = buf.subarray(4, 4 + 2000);
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const nextZipHeaderIndex = arr => arr.findIndex((el, i, arr) => arr[i] === 0x50 && arr[i + 1] === 0x4B && arr[i + 2] === 0x3 && arr[i + 3] === 0x4);
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const header2Pos = nextZipHeaderIndex(sliced);
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if (header2Pos !== -1) {
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const slicedAgain = buf.subarray(header2Pos + 8, header2Pos + 8 + 1000);
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const header3Pos = nextZipHeaderIndex(slicedAgain);
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if (header3Pos !== -1) {
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const offset = 8 + header2Pos + header3Pos + 30;
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if (checkString('word/', {offset})) {
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return {
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ext: 'docx',
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mime: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
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};
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}
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if (checkString('ppt/', {offset})) {
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return {
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ext: 'pptx',
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mime: 'application/vnd.openxmlformats-officedocument.presentationml.presentation'
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};
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}
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if (checkString('xl/', {offset})) {
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return {
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ext: 'xlsx',
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mime: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
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};
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}
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}
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}
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}
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}
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if (
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check([0x50, 0x4B]) &&
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(buf[2] === 0x3 || buf[2] === 0x5 || buf[2] === 0x7) &&
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(buf[3] === 0x4 || buf[3] === 0x6 || buf[3] === 0x8)
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) {
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return {
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ext: 'zip',
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mime: 'application/zip'
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};
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}
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if (check([0x75, 0x73, 0x74, 0x61, 0x72], {offset: 257})) {
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return {
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ext: 'tar',
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mime: 'application/x-tar'
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};
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}
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if (
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check([0x52, 0x61, 0x72, 0x21, 0x1A, 0x7]) &&
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(buf[6] === 0x0 || buf[6] === 0x1)
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) {
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return {
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ext: 'rar',
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mime: 'application/x-rar-compressed'
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};
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}
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if (check([0x1F, 0x8B, 0x8])) {
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return {
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ext: 'gz',
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mime: 'application/gzip'
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};
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}
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if (check([0x42, 0x5A, 0x68])) {
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return {
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ext: 'bz2',
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mime: 'application/x-bzip2'
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};
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}
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if (check([0x37, 0x7A, 0xBC, 0xAF, 0x27, 0x1C])) {
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return {
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ext: '7z',
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mime: 'application/x-7z-compressed'
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};
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}
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if (check([0x78, 0x01])) {
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return {
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ext: 'dmg',
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mime: 'application/x-apple-diskimage'
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};
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}
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if (check([0x33, 0x67, 0x70, 0x35]) || // 3gp5
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(
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check([0x0, 0x0, 0x0]) && check([0x66, 0x74, 0x79, 0x70], {offset: 4}) &&
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(
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check([0x6D, 0x70, 0x34, 0x31], {offset: 8}) || // MP41
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check([0x6D, 0x70, 0x34, 0x32], {offset: 8}) || // MP42
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check([0x69, 0x73, 0x6F, 0x6D], {offset: 8}) || // ISOM
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check([0x69, 0x73, 0x6F, 0x32], {offset: 8}) || // ISO2
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check([0x6D, 0x6D, 0x70, 0x34], {offset: 8}) || // MMP4
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check([0x4D, 0x34, 0x56], {offset: 8}) || // M4V
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check([0x64, 0x61, 0x73, 0x68], {offset: 8}) // DASH
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)
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)) {
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return {
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ext: 'mp4',
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mime: 'video/mp4'
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};
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}
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if (check([0x4D, 0x54, 0x68, 0x64])) {
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return {
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ext: 'mid',
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mime: 'audio/midi'
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};
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}
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// https://github.com/threatstack/libmagic/blob/master/magic/Magdir/matroska
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if (check([0x1A, 0x45, 0xDF, 0xA3])) {
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const sliced = buf.subarray(4, 4 + 4096);
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const idPos = sliced.findIndex((el, i, arr) => arr[i] === 0x42 && arr[i + 1] === 0x82);
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if (idPos !== -1) {
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const docTypePos = idPos + 3;
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const findDocType = type => [...type].every((c, i) => sliced[docTypePos + i] === c.charCodeAt(0));
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if (findDocType('matroska')) {
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return {
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ext: 'mkv',
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mime: 'video/x-matroska'
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};
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}
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if (findDocType('webm')) {
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return {
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ext: 'webm',
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mime: 'video/webm'
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};
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}
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}
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}
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if (check([0x0, 0x0, 0x0, 0x14, 0x66, 0x74, 0x79, 0x70, 0x71, 0x74, 0x20, 0x20]) ||
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check([0x66, 0x72, 0x65, 0x65], {offset: 4}) ||
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check([0x66, 0x74, 0x79, 0x70, 0x71, 0x74, 0x20, 0x20], {offset: 4}) ||
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check([0x6D, 0x64, 0x61, 0x74], {offset: 4}) || // MJPEG
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check([0x77, 0x69, 0x64, 0x65], {offset: 4})) {
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return {
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ext: 'mov',
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mime: 'video/quicktime'
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};
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}
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// RIFF file format which might be AVI, WAV, QCP, etc
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if (check([0x52, 0x49, 0x46, 0x46])) {
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if (check([0x41, 0x56, 0x49], {offset: 8})) {
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return {
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ext: 'avi',
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mime: 'video/x-msvideo'
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};
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}
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if (check([0x57, 0x41, 0x56, 0x45], {offset: 8})) {
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return {
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ext: 'wav',
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mime: 'audio/x-wav'
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};
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}
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// QLCM, QCP file
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if (check([0x51, 0x4C, 0x43, 0x4D], {offset: 8})) {
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return {
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ext: 'qcp',
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mime: 'audio/qcelp'
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};
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}
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}
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if (check([0x30, 0x26, 0xB2, 0x75, 0x8E, 0x66, 0xCF, 0x11, 0xA6, 0xD9])) {
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return {
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ext: 'wmv',
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mime: 'video/x-ms-wmv'
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};
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}
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if (
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check([0x0, 0x0, 0x1, 0xBA]) ||
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check([0x0, 0x0, 0x1, 0xB3])
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) {
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return {
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ext: 'mpg',
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mime: 'video/mpeg'
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};
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}
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if (check([0x66, 0x74, 0x79, 0x70, 0x33, 0x67], {offset: 4})) {
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return {
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ext: '3gp',
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mime: 'video/3gpp'
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};
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}
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// Check for MPEG header at different starting offsets
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for (let start = 0; start < 2 && start < (buf.length - 16); start++) {
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if (
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check([0x49, 0x44, 0x33], {offset: start}) || // ID3 header
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check([0xFF, 0xE2], {offset: start, mask: [0xFF, 0xE2]}) // MPEG 1 or 2 Layer 3 header
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) {
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return {
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ext: 'mp3',
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mime: 'audio/mpeg'
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};
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}
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if (
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check([0xFF, 0xE4], {offset: start, mask: [0xFF, 0xE4]}) // MPEG 1 or 2 Layer 2 header
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) {
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return {
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ext: 'mp2',
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mime: 'audio/mpeg'
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};
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}
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if (
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check([0xFF, 0xF8], {offset: start, mask: [0xFF, 0xFC]}) // MPEG 2 layer 0 using ADTS
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) {
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return {
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ext: 'mp2',
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mime: 'audio/mpeg'
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};
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}
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if (
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check([0xFF, 0xF0], {offset: start, mask: [0xFF, 0xFC]}) // MPEG 4 layer 0 using ADTS
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) {
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return {
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ext: 'mp4',
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mime: 'audio/mpeg'
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};
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}
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}
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if (
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check([0x66, 0x74, 0x79, 0x70, 0x4D, 0x34, 0x41], {offset: 4}) ||
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check([0x4D, 0x34, 0x41, 0x20])
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) {
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return {
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ext: 'm4a',
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mime: 'audio/m4a'
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};
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}
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// Needs to be before `ogg` check
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if (check([0x4F, 0x70, 0x75, 0x73, 0x48, 0x65, 0x61, 0x64], {offset: 28})) {
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return {
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ext: 'opus',
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mime: 'audio/opus'
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};
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}
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// If 'OggS' in first bytes, then OGG container
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if (check([0x4F, 0x67, 0x67, 0x53])) {
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// This is a OGG container
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// If ' theora' in header.
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if (check([0x80, 0x74, 0x68, 0x65, 0x6F, 0x72, 0x61], {offset: 28})) {
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return {
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ext: 'ogv',
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mime: 'video/ogg'
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};
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}
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// If '\x01video' in header.
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if (check([0x01, 0x76, 0x69, 0x64, 0x65, 0x6F, 0x00], {offset: 28})) {
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return {
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ext: 'ogm',
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mime: 'video/ogg'
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};
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}
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// If ' FLAC' in header https://xiph.org/flac/faq.html
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if (check([0x7F, 0x46, 0x4C, 0x41, 0x43], {offset: 28})) {
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return {
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ext: 'oga',
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mime: 'audio/ogg'
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};
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}
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// 'Speex ' in header https://en.wikipedia.org/wiki/Speex
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if (check([0x53, 0x70, 0x65, 0x65, 0x78, 0x20, 0x20], {offset: 28})) {
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return {
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ext: 'spx',
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mime: 'audio/ogg'
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};
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}
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// If '\x01vorbis' in header
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if (check([0x01, 0x76, 0x6F, 0x72, 0x62, 0x69, 0x73], {offset: 28})) {
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return {
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ext: 'ogg',
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mime: 'audio/ogg'
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};
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}
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// Default OGG container https://www.iana.org/assignments/media-types/application/ogg
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return {
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ext: 'ogx',
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mime: 'application/ogg'
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};
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}
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if (check([0x66, 0x4C, 0x61, 0x43])) {
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return {
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ext: 'flac',
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mime: 'audio/x-flac'
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};
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}
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if (check([0x4D, 0x41, 0x43, 0x20])) {
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return {
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ext: 'ape',
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mime: 'audio/ape'
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};
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}
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if (check([0x23, 0x21, 0x41, 0x4D, 0x52, 0x0A])) {
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return {
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ext: 'amr',
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mime: 'audio/amr'
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};
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}
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if (check([0x25, 0x50, 0x44, 0x46])) {
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return {
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ext: 'pdf',
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mime: 'application/pdf'
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};
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}
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if (check([0x4D, 0x5A])) {
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return {
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ext: 'exe',
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mime: 'application/x-msdownload'
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};
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}
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if (
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(buf[0] === 0x43 || buf[0] === 0x46) &&
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check([0x57, 0x53], {offset: 1})
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) {
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return {
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ext: 'swf',
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mime: 'application/x-shockwave-flash'
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};
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}
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if (check([0x7B, 0x5C, 0x72, 0x74, 0x66])) {
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return {
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ext: 'rtf',
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mime: 'application/rtf'
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};
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}
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if (check([0x00, 0x61, 0x73, 0x6D])) {
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return {
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ext: 'wasm',
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mime: 'application/wasm'
|
|
};
|
|
}
|
|
|
|
if (
|
|
check([0x77, 0x4F, 0x46, 0x46]) &&
|
|
(
|
|
check([0x00, 0x01, 0x00, 0x00], {offset: 4}) ||
|
|
check([0x4F, 0x54, 0x54, 0x4F], {offset: 4})
|
|
)
|
|
) {
|
|
return {
|
|
ext: 'woff',
|
|
mime: 'font/woff'
|
|
};
|
|
}
|
|
|
|
if (
|
|
check([0x77, 0x4F, 0x46, 0x32]) &&
|
|
(
|
|
check([0x00, 0x01, 0x00, 0x00], {offset: 4}) ||
|
|
check([0x4F, 0x54, 0x54, 0x4F], {offset: 4})
|
|
)
|
|
) {
|
|
return {
|
|
ext: 'woff2',
|
|
mime: 'font/woff2'
|
|
};
|
|
}
|
|
|
|
if (
|
|
check([0x4C, 0x50], {offset: 34}) &&
|
|
(
|
|
check([0x00, 0x00, 0x01], {offset: 8}) ||
|
|
check([0x01, 0x00, 0x02], {offset: 8}) ||
|
|
check([0x02, 0x00, 0x02], {offset: 8})
|
|
)
|
|
) {
|
|
return {
|
|
ext: 'eot',
|
|
mime: 'application/octet-stream'
|
|
};
|
|
}
|
|
|
|
if (check([0x00, 0x01, 0x00, 0x00, 0x00])) {
|
|
return {
|
|
ext: 'ttf',
|
|
mime: 'font/ttf'
|
|
};
|
|
}
|
|
|
|
if (check([0x4F, 0x54, 0x54, 0x4F, 0x00])) {
|
|
return {
|
|
ext: 'otf',
|
|
mime: 'font/otf'
|
|
};
|
|
}
|
|
|
|
if (check([0x00, 0x00, 0x01, 0x00])) {
|
|
return {
|
|
ext: 'ico',
|
|
mime: 'image/x-icon'
|
|
};
|
|
}
|
|
|
|
if (check([0x00, 0x00, 0x02, 0x00])) {
|
|
return {
|
|
ext: 'cur',
|
|
mime: 'image/x-icon'
|
|
};
|
|
}
|
|
|
|
if (check([0x46, 0x4C, 0x56, 0x01])) {
|
|
return {
|
|
ext: 'flv',
|
|
mime: 'video/x-flv'
|
|
};
|
|
}
|
|
|
|
if (check([0x25, 0x21])) {
|
|
return {
|
|
ext: 'ps',
|
|
mime: 'application/postscript'
|
|
};
|
|
}
|
|
|
|
if (check([0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00])) {
|
|
return {
|
|
ext: 'xz',
|
|
mime: 'application/x-xz'
|
|
};
|
|
}
|
|
|
|
if (check([0x53, 0x51, 0x4C, 0x69])) {
|
|
return {
|
|
ext: 'sqlite',
|
|
mime: 'application/x-sqlite3'
|
|
};
|
|
}
|
|
|
|
if (check([0x4E, 0x45, 0x53, 0x1A])) {
|
|
return {
|
|
ext: 'nes',
|
|
mime: 'application/x-nintendo-nes-rom'
|
|
};
|
|
}
|
|
|
|
if (check([0x43, 0x72, 0x32, 0x34])) {
|
|
return {
|
|
ext: 'crx',
|
|
mime: 'application/x-google-chrome-extension'
|
|
};
|
|
}
|
|
|
|
if (
|
|
check([0x4D, 0x53, 0x43, 0x46]) ||
|
|
check([0x49, 0x53, 0x63, 0x28])
|
|
) {
|
|
return {
|
|
ext: 'cab',
|
|
mime: 'application/vnd.ms-cab-compressed'
|
|
};
|
|
}
|
|
|
|
// Needs to be before `ar` check
|
|
if (check([0x21, 0x3C, 0x61, 0x72, 0x63, 0x68, 0x3E, 0x0A, 0x64, 0x65, 0x62, 0x69, 0x61, 0x6E, 0x2D, 0x62, 0x69, 0x6E, 0x61, 0x72, 0x79])) {
|
|
return {
|
|
ext: 'deb',
|
|
mime: 'application/x-deb'
|
|
};
|
|
}
|
|
|
|
if (check([0x21, 0x3C, 0x61, 0x72, 0x63, 0x68, 0x3E])) {
|
|
return {
|
|
ext: 'ar',
|
|
mime: 'application/x-unix-archive'
|
|
};
|
|
}
|
|
|
|
if (check([0xED, 0xAB, 0xEE, 0xDB])) {
|
|
return {
|
|
ext: 'rpm',
|
|
mime: 'application/x-rpm'
|
|
};
|
|
}
|
|
|
|
if (
|
|
check([0x1F, 0xA0]) ||
|
|
check([0x1F, 0x9D])
|
|
) {
|
|
return {
|
|
ext: 'Z',
|
|
mime: 'application/x-compress'
|
|
};
|
|
}
|
|
|
|
if (check([0x4C, 0x5A, 0x49, 0x50])) {
|
|
return {
|
|
ext: 'lz',
|
|
mime: 'application/x-lzip'
|
|
};
|
|
}
|
|
|
|
if (check([0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1])) {
|
|
return {
|
|
ext: 'msi',
|
|
mime: 'application/x-msi'
|
|
};
|
|
}
|
|
|
|
if (check([0x06, 0x0E, 0x2B, 0x34, 0x02, 0x05, 0x01, 0x01, 0x0D, 0x01, 0x02, 0x01, 0x01, 0x02])) {
|
|
return {
|
|
ext: 'mxf',
|
|
mime: 'application/mxf'
|
|
};
|
|
}
|
|
|
|
if (check([0x47], {offset: 4}) && (check([0x47], {offset: 192}) || check([0x47], {offset: 196}))) {
|
|
return {
|
|
ext: 'mts',
|
|
mime: 'video/mp2t'
|
|
};
|
|
}
|
|
|
|
if (check([0x42, 0x4C, 0x45, 0x4E, 0x44, 0x45, 0x52])) {
|
|
return {
|
|
ext: 'blend',
|
|
mime: 'application/x-blender'
|
|
};
|
|
}
|
|
|
|
if (check([0x42, 0x50, 0x47, 0xFB])) {
|
|
return {
|
|
ext: 'bpg',
|
|
mime: 'image/bpg'
|
|
};
|
|
}
|
|
|
|
if (check([0x00, 0x00, 0x00, 0x0C, 0x6A, 0x50, 0x20, 0x20, 0x0D, 0x0A, 0x87, 0x0A])) {
|
|
// JPEG-2000 family
|
|
|
|
if (check([0x6A, 0x70, 0x32, 0x20], {offset: 20})) {
|
|
return {
|
|
ext: 'jp2',
|
|
mime: 'image/jp2'
|
|
};
|
|
}
|
|
|
|
if (check([0x6A, 0x70, 0x78, 0x20], {offset: 20})) {
|
|
return {
|
|
ext: 'jpx',
|
|
mime: 'image/jpx'
|
|
};
|
|
}
|
|
|
|
if (check([0x6A, 0x70, 0x6D, 0x20], {offset: 20})) {
|
|
return {
|
|
ext: 'jpm',
|
|
mime: 'image/jpm'
|
|
};
|
|
}
|
|
|
|
if (check([0x6D, 0x6A, 0x70, 0x32], {offset: 20})) {
|
|
return {
|
|
ext: 'mj2',
|
|
mime: 'image/mj2'
|
|
};
|
|
}
|
|
}
|
|
|
|
if (check([0x46, 0x4F, 0x52, 0x4D, 0x00])) {
|
|
return {
|
|
ext: 'aif',
|
|
mime: 'audio/aiff'
|
|
};
|
|
}
|
|
|
|
if (checkString('<?xml ')) {
|
|
return {
|
|
ext: 'xml',
|
|
mime: 'application/xml'
|
|
};
|
|
}
|
|
|
|
if (check([0x42, 0x4F, 0x4F, 0x4B, 0x4D, 0x4F, 0x42, 0x49], {offset: 60})) {
|
|
return {
|
|
ext: 'mobi',
|
|
mime: 'application/x-mobipocket-ebook'
|
|
};
|
|
}
|
|
|
|
// File Type Box (https://en.wikipedia.org/wiki/ISO_base_media_file_format)
|
|
if (check([0x66, 0x74, 0x79, 0x70], {offset: 4})) {
|
|
if (check([0x6D, 0x69, 0x66, 0x31], {offset: 8})) {
|
|
return {
|
|
ext: 'heic',
|
|
mime: 'image/heif'
|
|
};
|
|
}
|
|
|
|
if (check([0x6D, 0x73, 0x66, 0x31], {offset: 8})) {
|
|
return {
|
|
ext: 'heic',
|
|
mime: 'image/heif-sequence'
|
|
};
|
|
}
|
|
|
|
if (check([0x68, 0x65, 0x69, 0x63], {offset: 8}) || check([0x68, 0x65, 0x69, 0x78], {offset: 8})) {
|
|
return {
|
|
ext: 'heic',
|
|
mime: 'image/heic'
|
|
};
|
|
}
|
|
|
|
if (check([0x68, 0x65, 0x76, 0x63], {offset: 8}) || check([0x68, 0x65, 0x76, 0x78], {offset: 8})) {
|
|
return {
|
|
ext: 'heic',
|
|
mime: 'image/heic-sequence'
|
|
};
|
|
}
|
|
}
|
|
|
|
if (check([0xAB, 0x4B, 0x54, 0x58, 0x20, 0x31, 0x31, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A])) {
|
|
return {
|
|
ext: 'ktx',
|
|
mime: 'image/ktx'
|
|
};
|
|
}
|
|
|
|
return null;
|
|
};
|