/usr/share/gocode/src/github.com/cockroachdb/cmux/matchers.go is in golang-github-cockroachdb-cmux-dev 0.0~git20170110.0.30d10be-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 | // Copyright 2016 The CMux Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
package cmux
import (
"bufio"
"io"
"io/ioutil"
"net/http"
"strings"
"golang.org/x/net/http2"
"golang.org/x/net/http2/hpack"
)
// Any is a Matcher that matches any connection.
func Any() Matcher {
return func(r io.Reader) bool { return true }
}
// PrefixMatcher returns a matcher that matches a connection if it
// starts with any of the strings in strs.
func PrefixMatcher(strs ...string) Matcher {
pt := newPatriciaTreeString(strs...)
return pt.matchPrefix
}
var defaultHTTPMethods = []string{
"OPTIONS",
"GET",
"HEAD",
"POST",
"PUT",
"DELETE",
"TRACE",
"CONNECT",
}
// HTTP1Fast only matches the methods in the HTTP request.
//
// This matcher is very optimistic: if it returns true, it does not mean that
// the request is a valid HTTP response. If you want a correct but slower HTTP1
// matcher, use HTTP1 instead.
func HTTP1Fast(extMethods ...string) Matcher {
return PrefixMatcher(append(defaultHTTPMethods, extMethods...)...)
}
const maxHTTPRead = 4096
// HTTP1 parses the first line or upto 4096 bytes of the request to see if
// the conection contains an HTTP request.
func HTTP1() Matcher {
return func(r io.Reader) bool {
br := bufio.NewReader(&io.LimitedReader{R: r, N: maxHTTPRead})
l, part, err := br.ReadLine()
if err != nil || part {
return false
}
_, _, proto, ok := parseRequestLine(string(l))
if !ok {
return false
}
v, _, ok := http.ParseHTTPVersion(proto)
return ok && v == 1
}
}
// grabbed from net/http.
func parseRequestLine(line string) (method, uri, proto string, ok bool) {
s1 := strings.Index(line, " ")
s2 := strings.Index(line[s1+1:], " ")
if s1 < 0 || s2 < 0 {
return
}
s2 += s1 + 1
return line[:s1], line[s1+1 : s2], line[s2+1:], true
}
// HTTP2 parses the frame header of the first frame to detect whether the
// connection is an HTTP2 connection.
func HTTP2() Matcher {
return hasHTTP2Preface
}
// HTTP1HeaderField returns a matcher matching the header fields of the first
// request of an HTTP 1 connection.
func HTTP1HeaderField(name, value string) Matcher {
return func(r io.Reader) bool {
return matchHTTP1Field(r, name, value)
}
}
// HTTP2HeaderField resturns a matcher matching the header fields of the first
// headers frame.
func HTTP2HeaderField(name, value string) Matcher {
return func(r io.Reader) bool {
return matchHTTP2Field(r, name, value)
}
}
func hasHTTP2Preface(r io.Reader) bool {
var b [len(http2.ClientPreface)]byte
if _, err := io.ReadFull(r, b[:]); err != nil {
return false
}
return string(b[:]) == http2.ClientPreface
}
func matchHTTP1Field(r io.Reader, name, value string) (matched bool) {
req, err := http.ReadRequest(bufio.NewReader(r))
if err != nil {
return false
}
return req.Header.Get(name) == value
}
func matchHTTP2Field(r io.Reader, name, value string) (matched bool) {
if !hasHTTP2Preface(r) {
return false
}
framer := http2.NewFramer(ioutil.Discard, r)
hdec := hpack.NewDecoder(uint32(4<<10), func(hf hpack.HeaderField) {
if hf.Name == name && hf.Value == value {
matched = true
}
})
for {
f, err := framer.ReadFrame()
if err != nil {
return false
}
switch f := f.(type) {
case *http2.HeadersFrame:
if _, err := hdec.Write(f.HeaderBlockFragment()); err != nil {
return false
}
if matched {
return true
}
if f.FrameHeader.Flags&http2.FlagHeadersEndHeaders != 0 {
return false
}
}
}
}
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