165 lines
3.9 KiB
Go
165 lines
3.9 KiB
Go
// Copyright 2016 The CMux Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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// implied. See the License for the specific language governing
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// permissions and limitations under the License.
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package cmux
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import (
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"bufio"
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"io"
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"io/ioutil"
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"net/http"
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"strings"
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"golang.org/x/net/http2"
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"golang.org/x/net/http2/hpack"
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)
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// Any is a Matcher that matches any connection.
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func Any() Matcher {
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return func(r io.Reader) bool { return true }
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}
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// PrefixMatcher returns a matcher that matches a connection if it
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// starts with any of the strings in strs.
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func PrefixMatcher(strs ...string) Matcher {
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pt := newPatriciaTreeString(strs...)
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return pt.matchPrefix
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}
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var defaultHTTPMethods = []string{
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"OPTIONS",
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"GET",
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"HEAD",
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"POST",
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"PUT",
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"DELETE",
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"TRACE",
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"CONNECT",
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}
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// HTTP1Fast only matches the methods in the HTTP request.
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//
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// This matcher is very optimistic: if it returns true, it does not mean that
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// the request is a valid HTTP response. If you want a correct but slower HTTP1
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// matcher, use HTTP1 instead.
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func HTTP1Fast(extMethods ...string) Matcher {
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return PrefixMatcher(append(defaultHTTPMethods, extMethods...)...)
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}
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const maxHTTPRead = 4096
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// HTTP1 parses the first line or upto 4096 bytes of the request to see if
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// the conection contains an HTTP request.
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func HTTP1() Matcher {
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return func(r io.Reader) bool {
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br := bufio.NewReader(&io.LimitedReader{R: r, N: maxHTTPRead})
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l, part, err := br.ReadLine()
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if err != nil || part {
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return false
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}
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_, _, proto, ok := parseRequestLine(string(l))
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if !ok {
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return false
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}
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v, _, ok := http.ParseHTTPVersion(proto)
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return ok && v == 1
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}
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}
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// grabbed from net/http.
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func parseRequestLine(line string) (method, uri, proto string, ok bool) {
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s1 := strings.Index(line, " ")
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s2 := strings.Index(line[s1+1:], " ")
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if s1 < 0 || s2 < 0 {
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return
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}
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s2 += s1 + 1
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return line[:s1], line[s1+1 : s2], line[s2+1:], true
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}
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// HTTP2 parses the frame header of the first frame to detect whether the
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// connection is an HTTP2 connection.
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func HTTP2() Matcher {
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return hasHTTP2Preface
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}
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// HTTP1HeaderField returns a matcher matching the header fields of the first
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// request of an HTTP 1 connection.
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func HTTP1HeaderField(name, value string) Matcher {
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return func(r io.Reader) bool {
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return matchHTTP1Field(r, name, value)
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}
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}
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// HTTP2HeaderField resturns a matcher matching the header fields of the first
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// headers frame.
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func HTTP2HeaderField(name, value string) Matcher {
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return func(r io.Reader) bool {
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return matchHTTP2Field(r, name, value)
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}
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}
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func hasHTTP2Preface(r io.Reader) bool {
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var b [len(http2.ClientPreface)]byte
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if _, err := io.ReadFull(r, b[:]); err != nil {
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return false
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}
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return string(b[:]) == http2.ClientPreface
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}
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func matchHTTP1Field(r io.Reader, name, value string) (matched bool) {
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req, err := http.ReadRequest(bufio.NewReader(r))
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if err != nil {
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return false
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}
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return req.Header.Get(name) == value
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}
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func matchHTTP2Field(r io.Reader, name, value string) (matched bool) {
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if !hasHTTP2Preface(r) {
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return false
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}
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framer := http2.NewFramer(ioutil.Discard, r)
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hdec := hpack.NewDecoder(uint32(4<<10), func(hf hpack.HeaderField) {
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if hf.Name == name && hf.Value == value {
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matched = true
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}
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})
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for {
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f, err := framer.ReadFrame()
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if err != nil {
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return false
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}
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switch f := f.(type) {
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case *http2.HeadersFrame:
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if _, err := hdec.Write(f.HeaderBlockFragment()); err != nil {
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return false
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}
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if matched {
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return true
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}
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if f.FrameHeader.Flags&http2.FlagHeadersEndHeaders != 0 {
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return false
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}
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}
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}
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}
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