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📁 ..
📄 alpn_test.go(3.01 KB)
📁 cgi
📄 client.go(33.4 KB)
📄 client_test.go(63.24 KB)
📄 clientserver_test.go(46.07 KB)
📄 clone.go(1.56 KB)
📄 cookie.go(11.53 KB)
📄 cookie_test.go(19.26 KB)
📁 cookiejar
📄 doc.go(3.42 KB)
📄 example_filesystem_test.go(2.04 KB)
📄 example_handle_test.go(560 B)
📄 example_test.go(5.38 KB)
📄 export_test.go(8.43 KB)
📁 fcgi
📄 filetransport.go(3.52 KB)
📄 filetransport_test.go(2.62 KB)
📄 fs.go(30.36 KB)
📄 fs_test.go(46.7 KB)
📄 h2_bundle.go(357.28 KB)
📄 h2_error.go(812 B)
📄 h2_error_test.go(1.04 KB)
📄 header.go(7.9 KB)
📄 header_test.go(6.05 KB)
📄 http.go(5.13 KB)
📄 http_test.go(5.22 KB)
📁 httptest
📁 httptrace
📁 httputil
📁 internal
📄 jar.go(900 B)
📄 main_test.go(4.94 KB)
📄 mapping.go(1.68 KB)
📄 mapping_test.go(2.95 KB)
📄 method.go(517 B)
📄 omithttp2.go(1.91 KB)
📄 pattern.go(15.17 KB)
📄 pattern_test.go(14.5 KB)
📁 pprof
📄 proxy_test.go(1.16 KB)
📄 range_test.go(2.38 KB)
📄 readrequest_test.go(9.7 KB)
📄 request.go(48.34 KB)
📄 request_test.go(42.39 KB)
📄 requestwrite_test.go(23.3 KB)
📄 response.go(11.1 KB)
📄 response_test.go(23.63 KB)
📄 responsecontroller.go(4.17 KB)
📄 responsecontroller_test.go(9.81 KB)
📄 responsewrite_test.go(6.89 KB)
📄 roundtrip.go(566 B)
📄 roundtrip_js.go(11.8 KB)
📄 routing_index.go(3.95 KB)
📄 routing_index_test.go(4.02 KB)
📄 routing_tree.go(7.48 KB)
📄 routing_tree_test.go(6.89 KB)
📄 serve_test.go(192.54 KB)
📄 servemux121.go(5.6 KB)
📄 server.go(120.67 KB)
📄 server_test.go(6.95 KB)
📄 sniff.go(7.9 KB)
📄 sniff_test.go(9.56 KB)
📄 socks_bundle.go(12.9 KB)
📄 status.go(7.45 KB)
📁 testdata
📄 transfer.go(30.89 KB)
📄 transfer_test.go(9.13 KB)
📄 transport.go(87.81 KB)
📄 transport_default_other.go(362 B)
📄 transport_default_wasm.go(364 B)
📄 transport_internal_test.go(6.05 KB)
📄 transport_test.go(186.06 KB)
📄 triv.go(3.22 KB)

Editing: sniff.go

// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package http

import (
	"bytes"
	"encoding/binary"
)

// The algorithm uses at most sniffLen bytes to make its decision.
const sniffLen = 512

// DetectContentType implements the algorithm described
// at https://mimesniff.spec.whatwg.org/ to determine the
// Content-Type of the given data. It considers at most the
// first 512 bytes of data. DetectContentType always returns
// a valid MIME type: if it cannot determine a more specific one, it
// returns "application/octet-stream".
func DetectContentType(data []byte) string {
	if len(data) > sniffLen {
		data = data[:sniffLen]
	}

// Index of the first non-whitespace byte in data.
	firstNonWS := 0
	for ; firstNonWS < len(data) && isWS(data[firstNonWS]); firstNonWS++ {
	}

for _, sig := range sniffSignatures {
		if ct := sig.match(data, firstNonWS); ct != "" {
			return ct
		}
	}

return "application/octet-stream" // fallback
}

// isWS reports whether the provided byte is a whitespace byte (0xWS)
// as defined in https://mimesniff.spec.whatwg.org/#terminology.
func isWS(b byte) bool {
	switch b {
	case '\t', '\n', '\x0c', '\r', ' ':
		return true
	}
	return false
}

// isTT reports whether the provided byte is a tag-terminating byte (0xTT)
// as defined in https://mimesniff.spec.whatwg.org/#terminology.
func isTT(b byte) bool {
	switch b {
	case ' ', '>':
		return true
	}
	return false
}

type sniffSig interface {
	// match returns the MIME type of the data, or "" if unknown.
	match(data []byte, firstNonWS int) string
}

// Data matching the table in section 6.
var sniffSignatures = []sniffSig{
	htmlSig("<!DOCTYPE HTML"),
	htmlSig("<HTML"),
	htmlSig("<HEAD"),
	htmlSig("<SCRIPT"),
	htmlSig("<IFRAME"),
	htmlSig("<H1"),
	htmlSig("<DIV"),
	htmlSig("<FONT"),
	htmlSig("<TABLE"),
	htmlSig("<A"),
	htmlSig("<STYLE"),
	htmlSig("<TITLE"),
	htmlSig("<B"),
	htmlSig("<BODY"),
	htmlSig("<BR"),
	htmlSig("<P"),
	htmlSig("<!--"),
	&maskedSig{
		mask:   []byte("\xFF\xFF\xFF\xFF\xFF"),
		pat:    []byte("<?xml"),
		skipWS: true,
		ct:     "text/xml; charset=utf-8"},
	&exactSig{[]byte("%PDF-"), "application/pdf"},
	&exactSig{[]byte("%!PS-Adobe-"), "application/postscript"},

// UTF BOMs.
	&maskedSig{
		mask: []byte("\xFF\xFF\x00\x00"),
		pat:  []byte("\xFE\xFF\x00\x00"),
		ct:   "text/plain; charset=utf-16be",
	},
	&maskedSig{
		mask: []byte("\xFF\xFF\x00\x00"),
		pat:  []byte("\xFF\xFE\x00\x00"),
		ct:   "text/plain; charset=utf-16le",
	},
	&maskedSig{
		mask: []byte("\xFF\xFF\xFF\x00"),
		pat:  []byte("\xEF\xBB\xBF\x00"),
		ct:   "text/plain; charset=utf-8",
	},

// Image types
	// For posterity, we originally returned "image/vnd.microsoft.icon" from
	// https://tools.ietf.org/html/draft-ietf-websec-mime-sniff-03#section-7
	// https://codereview.appspot.com/4746042
	// but that has since been replaced with "image/x-icon" in Section 6.2
	// of https://mimesniff.spec.whatwg.org/#matching-an-image-type-pattern
	&exactSig{[]byte("\x00\x00\x01\x00"), "image/x-icon"},
	&exactSig{[]byte("\x00\x00\x02\x00"), "image/x-icon"},
	&exactSig{[]byte("BM"), "image/bmp"},
	&exactSig{[]byte("GIF87a"), "image/gif"},
	&exactSig{[]byte("GIF89a"), "image/gif"},
	&maskedSig{
		mask: []byte("\xFF\xFF\xFF\xFF\x00\x00\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF"),
		pat:  []byte("RIFF\x00\x00\x00\x00WEBPVP"),
		ct:   "image/webp",
	},
	&exactSig{[]byte("\x89PNG\x0D\x0A\x1A\x0A"), "image/png"},
	&exactSig{[]byte("\xFF\xD8\xFF"), "image/jpeg"},

// Audio and Video types
	// Enforce the pattern match ordering as prescribed in
	// https://mimesniff.spec.whatwg.org/#matching-an-audio-or-video-type-pattern
	&maskedSig{
		mask: []byte("\xFF\xFF\xFF\xFF\x00\x00\x00\x00\xFF\xFF\xFF\xFF"),
		pat:  []byte("FORM\x00\x00\x00\x00AIFF"),
		ct:   "audio/aiff",
	},
	&maskedSig{
		mask: []byte("\xFF\xFF\xFF"),
		pat:  []byte("ID3"),
		ct:   "audio/mpeg",
	},
	&maskedSig{
		mask: []byte("\xFF\xFF\xFF\xFF\xFF"),
		pat:  []byte("OggS\x00"),
		ct:   "application/ogg",
	},
	&maskedSig{
		mask: []byte("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"),
		pat:  []byte("MThd\x00\x00\x00\x06"),
		ct:   "audio/midi",
	},
	&maskedSig{
		mask: []byte("\xFF\xFF\xFF\xFF\x00\x00\x00\x00\xFF\xFF\xFF\xFF"),
		pat:  []byte("RIFF\x00\x00\x00\x00AVI "),
		ct:   "video/avi",
	},
	&maskedSig{
		mask: []byte("\xFF\xFF\xFF\xFF\x00\x00\x00\x00\xFF\xFF\xFF\xFF"),
		pat:  []byte("RIFF\x00\x00\x00\x00WAVE"),
		ct:   "audio/wave",
	},
	// 6.2.0.2. video/mp4
	mp4Sig{},
	// 6.2.0.3. video/webm
	&exactSig{[]byte("\x1A\x45\xDF\xA3"), "video/webm"},

// Font types
	&maskedSig{
		// 34 NULL bytes followed by the string "LP"
		pat: []byte("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00LP"),
		// 34 NULL bytes followed by \xF\xF
		mask: []byte("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF"),
		ct:   "application/vnd.ms-fontobject",
	},
	&exactSig{[]byte("\x00\x01\x00\x00"), "font/ttf"},
	&exactSig{[]byte("OTTO"), "font/otf"},
	&exactSig{[]byte("ttcf"), "font/collection"},
	&exactSig{[]byte("wOFF"), "font/woff"},
	&exactSig{[]byte("wOF2"), "font/woff2"},

// Archive types
	&exactSig{[]byte("\x1F\x8B\x08"), "application/x-gzip"},
	&exactSig{[]byte("PK\x03\x04"), "application/zip"},
	// RAR's signatures are incorrectly defined by the MIME spec as per
	//    https://github.com/whatwg/mimesniff/issues/63
	// However, RAR Labs correctly defines it at:
	//    https://www.rarlab.com/technote.htm#rarsign
	// so we use the definition from RAR Labs.
	// TODO: do whatever the spec ends up doing.
	&exactSig{[]byte("Rar!\x1A\x07\x00"), "application/x-rar-compressed"},     // RAR v1.5-v4.0
	&exactSig{[]byte("Rar!\x1A\x07\x01\x00"), "application/x-rar-compressed"}, // RAR v5+

&exactSig{[]byte("\x00\x61\x73\x6D"), "application/wasm"},

textSig{}, // should be last
}

type exactSig struct {
	sig []byte
	ct  string
}

func (e *exactSig) match(data []byte, firstNonWS int) string {
	if bytes.HasPrefix(data, e.sig) {
		return e.ct
	}
	return ""
}

type maskedSig struct {
	mask, pat []byte
	skipWS    bool
	ct        string
}

func (m *maskedSig) match(data []byte, firstNonWS int) string {
	// pattern matching algorithm section 6
	// https://mimesniff.spec.whatwg.org/#pattern-matching-algorithm

if m.skipWS {
		data = data[firstNonWS:]
	}
	if len(m.pat) != len(m.mask) {
		return ""
	}
	if len(data) < len(m.pat) {
		return ""
	}
	for i, pb := range m.pat {
		maskedData := data[i] & m.mask[i]
		if maskedData != pb {
			return ""
		}
	}
	return m.ct
}

type htmlSig []byte

func (h htmlSig) match(data []byte, firstNonWS int) string {
	data = data[firstNonWS:]
	if len(data) < len(h)+1 {
		return ""
	}
	for i, b := range h {
		db := data[i]
		if 'A' <= b && b <= 'Z' {
			db &= 0xDF
		}
		if b != db {
			return ""
		}
	}
	// Next byte must be a tag-terminating byte(0xTT).
	if !isTT(data[len(h)]) {
		return ""
	}
	return "text/html; charset=utf-8"
}

var mp4ftype = []byte("ftyp")
var mp4 = []byte("mp4")

type mp4Sig struct{}

func (mp4Sig) match(data []byte, firstNonWS int) string {
	// https://mimesniff.spec.whatwg.org/#signature-for-mp4
	// c.f. section 6.2.1
	if len(data) < 12 {
		return ""
	}
	boxSize := int(binary.BigEndian.Uint32(data[:4]))
	if len(data) < boxSize || boxSize%4 != 0 {
		return ""
	}
	if !bytes.Equal(data[4:8], mp4ftype) {
		return ""
	}
	for st := 8; st < boxSize; st += 4 {
		if st == 12 {
			// Ignores the four bytes that correspond to the version number of the "major brand".
			continue
		}
		if bytes.Equal(data[st:st+3], mp4) {
			return "video/mp4"
		}
	}
	return ""
}

type textSig struct{}

func (textSig) match(data []byte, firstNonWS int) string {
	// c.f. section 5, step 4.
	for _, b := range data[firstNonWS:] {
		switch {
		case b <= 0x08,
			b == 0x0B,
			0x0E <= b && b <= 0x1A,
			0x1C <= b && b <= 0x1F:
			return ""
		}
	}
	return "text/plain; charset=utf-8"
}

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Editing: sniff.go

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