/usr/share/gocode/src/github.com/Azure/azure-sdk-for-go/core/http/cgi/child.go is in golang-github-azure-azure-sdk-for-go-dev 1.2~git20150611.0.97d9593-2ubuntu1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 | // 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.
// This file implements CGI from the perspective of a child
// process.
package cgi
import (
"bufio"
"crypto/tls"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"strconv"
"strings"
)
// Request returns the HTTP request as represented in the current
// environment. This assumes the current program is being run
// by a web server in a CGI environment.
// The returned Request's Body is populated, if applicable.
func Request() (*http.Request, error) {
r, err := RequestFromMap(envMap(os.Environ()))
if err != nil {
return nil, err
}
if r.ContentLength > 0 {
r.Body = ioutil.NopCloser(io.LimitReader(os.Stdin, r.ContentLength))
}
return r, nil
}
func envMap(env []string) map[string]string {
m := make(map[string]string)
for _, kv := range env {
if idx := strings.Index(kv, "="); idx != -1 {
m[kv[:idx]] = kv[idx+1:]
}
}
return m
}
// RequestFromMap creates an http.Request from CGI variables.
// The returned Request's Body field is not populated.
func RequestFromMap(params map[string]string) (*http.Request, error) {
r := new(http.Request)
r.Method = params["REQUEST_METHOD"]
if r.Method == "" {
return nil, errors.New("cgi: no REQUEST_METHOD in environment")
}
r.Proto = params["SERVER_PROTOCOL"]
var ok bool
r.ProtoMajor, r.ProtoMinor, ok = http.ParseHTTPVersion(r.Proto)
if !ok {
return nil, errors.New("cgi: invalid SERVER_PROTOCOL version")
}
r.Close = true
r.Trailer = http.Header{}
r.Header = http.Header{}
r.Host = params["HTTP_HOST"]
if lenstr := params["CONTENT_LENGTH"]; lenstr != "" {
clen, err := strconv.ParseInt(lenstr, 10, 64)
if err != nil {
return nil, errors.New("cgi: bad CONTENT_LENGTH in environment: " + lenstr)
}
r.ContentLength = clen
}
if ct := params["CONTENT_TYPE"]; ct != "" {
r.Header.Set("Content-Type", ct)
}
// Copy "HTTP_FOO_BAR" variables to "Foo-Bar" Headers
for k, v := range params {
if !strings.HasPrefix(k, "HTTP_") || k == "HTTP_HOST" {
continue
}
r.Header.Add(strings.Replace(k[5:], "_", "-", -1), v)
}
// TODO: cookies. parsing them isn't exported, though.
uriStr := params["REQUEST_URI"]
if uriStr == "" {
// Fallback to SCRIPT_NAME, PATH_INFO and QUERY_STRING.
uriStr = params["SCRIPT_NAME"] + params["PATH_INFO"]
s := params["QUERY_STRING"]
if s != "" {
uriStr += "?" + s
}
}
// There's apparently a de-facto standard for this.
// http://docstore.mik.ua/orelly/linux/cgi/ch03_02.htm#ch03-35636
if s := params["HTTPS"]; s == "on" || s == "ON" || s == "1" {
r.TLS = &tls.ConnectionState{HandshakeComplete: true}
}
if r.Host != "" {
// Hostname is provided, so we can reasonably construct a URL.
rawurl := r.Host + uriStr
if r.TLS == nil {
rawurl = "http://" + rawurl
} else {
rawurl = "https://" + rawurl
}
url, err := url.Parse(rawurl)
if err != nil {
return nil, errors.New("cgi: failed to parse host and REQUEST_URI into a URL: " + rawurl)
}
r.URL = url
}
// Fallback logic if we don't have a Host header or the URL
// failed to parse
if r.URL == nil {
url, err := url.Parse(uriStr)
if err != nil {
return nil, errors.New("cgi: failed to parse REQUEST_URI into a URL: " + uriStr)
}
r.URL = url
}
// Request.RemoteAddr has its port set by Go's standard http
// server, so we do here too. We don't have one, though, so we
// use a dummy one.
r.RemoteAddr = net.JoinHostPort(params["REMOTE_ADDR"], "0")
return r, nil
}
// Serve executes the provided Handler on the currently active CGI
// request, if any. If there's no current CGI environment
// an error is returned. The provided handler may be nil to use
// http.DefaultServeMux.
func Serve(handler http.Handler) error {
req, err := Request()
if err != nil {
return err
}
if handler == nil {
handler = http.DefaultServeMux
}
rw := &response{
req: req,
header: make(http.Header),
bufw: bufio.NewWriter(os.Stdout),
}
handler.ServeHTTP(rw, req)
rw.Write(nil) // make sure a response is sent
if err = rw.bufw.Flush(); err != nil {
return err
}
return nil
}
type response struct {
req *http.Request
header http.Header
bufw *bufio.Writer
headerSent bool
}
func (r *response) Flush() {
r.bufw.Flush()
}
func (r *response) Header() http.Header {
return r.header
}
func (r *response) Write(p []byte) (n int, err error) {
if !r.headerSent {
r.WriteHeader(http.StatusOK)
}
return r.bufw.Write(p)
}
func (r *response) WriteHeader(code int) {
if r.headerSent {
// Note: explicitly using Stderr, as Stdout is our HTTP output.
fmt.Fprintf(os.Stderr, "CGI attempted to write header twice on request for %s", r.req.URL)
return
}
r.headerSent = true
fmt.Fprintf(r.bufw, "Status: %d %s\r\n", code, http.StatusText(code))
// Set a default Content-Type
if _, hasType := r.header["Content-Type"]; !hasType {
r.header.Add("Content-Type", "text/html; charset=utf-8")
}
r.header.Write(r.bufw)
r.bufw.WriteString("\r\n")
r.bufw.Flush()
}
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