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env.go
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env.go
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// Copyright 2013 Joe Walnes and the websocketd team.
// All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package libwebsocketd
import (
"fmt"
"net"
"os"
"strconv"
"strings"
"time"
"code.google.com/p/go.net/websocket"
)
const (
gatewayInterface = "websocketd-CGI/0.1"
)
var headerNewlineToSpace = strings.NewReplacer("\n", " ", "\r", " ")
var headerDashToUnderscore = strings.NewReplacer("-", "_")
func generateId() string {
return strconv.FormatInt(time.Now().UnixNano(), 10)
}
func remoteDetails(ws *websocket.Conn, config *Config) (string, string, string, error) {
remoteAddr, remotePort, err := net.SplitHostPort(ws.Request().RemoteAddr)
if err != nil {
return "", "", "", err
}
var remoteHost string
if config.ReverseLookup {
remoteHosts, err := net.LookupAddr(remoteAddr)
if err != nil || len(remoteHosts) == 0 {
remoteHost = remoteAddr
} else {
remoteHost = remoteHosts[0]
}
} else {
remoteHost = remoteAddr
}
return remoteAddr, remoteHost, remotePort, nil
}
func createEnv(ws *websocket.Conn, config *Config, urlInfo *URLInfo, id string) ([]string, error) {
req := ws.Request()
headers := req.Header
url := req.URL
remoteAddr, remoteHost, remotePort, err := remoteDetails(ws, config)
if err != nil {
return nil, err
}
serverName, serverPort, err := net.SplitHostPort(req.Host)
if err != nil {
if !strings.Contains(req.Host, ":") {
serverName = req.Host
serverPort = "80"
} else {
return nil, err
}
}
standardEnvCount := 20
parentEnv := os.Environ()
env := make([]string, 0, len(headers)+standardEnvCount+len(parentEnv)+len(config.Env))
for _, v := range parentEnv {
env = append(env, v)
}
// IMPORTANT ---> Adding a header? Make sure standardHeaderCount (above) is up to date.
// Standard CGI specification headers.
// As defined in http://tools.ietf.org/html/rfc3875
env = appendEnv(env, "REMOTE_ADDR", remoteAddr)
env = appendEnv(env, "REMOTE_HOST", remoteHost)
env = appendEnv(env, "SERVER_NAME", serverName)
env = appendEnv(env, "SERVER_PORT", serverPort)
env = appendEnv(env, "SERVER_PROTOCOL", req.Proto)
env = appendEnv(env, "SERVER_SOFTWARE", fmt.Sprintf("websocketd/%s", Version()))
env = appendEnv(env, "GATEWAY_INTERFACE", gatewayInterface)
env = appendEnv(env, "REQUEST_METHOD", req.Method)
env = appendEnv(env, "SCRIPT_NAME", urlInfo.ScriptPath)
env = appendEnv(env, "PATH_INFO", urlInfo.PathInfo)
env = appendEnv(env, "PATH_TRANSLATED", url.Path)
env = appendEnv(env, "QUERY_STRING", url.RawQuery)
// Not supported, but we explicitly clear them so we don't get leaks from parent environment.
env = appendEnv(env, "AUTH_TYPE", "")
env = appendEnv(env, "CONTENT_LENGTH", "")
env = appendEnv(env, "CONTENT_TYPE", "")
env = appendEnv(env, "REMOTE_IDENT", "")
env = appendEnv(env, "REMOTE_USER", "")
// Non standard, but commonly used headers.
env = appendEnv(env, "UNIQUE_ID", id) // Based on Apache mod_unique_id.
env = appendEnv(env, "REMOTE_PORT", remotePort)
env = appendEnv(env, "REQUEST_URI", url.RequestURI()) // e.g. /foo/blah?a=b
// The following variables are part of the CGI specification, but are optional
// and not set by websocketd:
//
// AUTH_TYPE, REMOTE_USER, REMOTE_IDENT
// -- Authentication left to the underlying programs.
//
// CONTENT_LENGTH, CONTENT_TYPE
// -- makes no sense for WebSocket connections.
//
// HTTPS, SSL_*
// -- SSL not supported
for k, _ := range headers {
env = appendEnv(env, fmt.Sprintf("HTTP_%s", headerDashToUnderscore.Replace(k)), headers[k]...)
}
for _, v := range config.Env {
env = append(env, v)
}
return env, nil
}
// Adapted from net/http/header.go
func appendEnv(env []string, k string, v ...string) []string {
if len(v) == 0 {
return env
}
vCleaned := make([]string, 0, len(v))
for _, val := range v {
vCleaned = append(vCleaned, strings.TrimSpace(headerNewlineToSpace.Replace(val)))
}
return append(env, fmt.Sprintf("%s=%s",
strings.ToUpper(k),
strings.Join(vCleaned, ", ")))
}