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util.go
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util.go
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package main
import (
"encoding/base64"
"encoding/hex"
"errors"
"fmt"
"io/fs"
"net"
"net/http"
"os"
"sort"
"strconv"
"strings"
"syscall"
"time"
"golang.org/x/sys/unix"
"github.com/chronos-tachyon/roxy/internal/constants"
"github.com/chronos-tachyon/roxy/internal/enums"
"github.com/chronos-tachyon/roxy/proto/roxy_v0"
)
// type fileInfoList {{{
type fileInfoList []fs.FileInfo
func (list fileInfoList) Len() int {
return len(list)
}
func (list fileInfoList) Less(i, j int) bool {
a, b := list[i], list[j]
aName, aIsDir := a.Name(), a.IsDir()
bName, bIsDir := b.Name(), b.IsDir()
aIsDot := strings.HasPrefix(aName, ".")
bIsDot := strings.HasPrefix(bName, ".")
if aIsDir != bIsDir {
return aIsDir
}
if aIsDot != bIsDot {
return aIsDot
}
return aName < bName
}
func (list fileInfoList) Swap(i, j int) {
list[i], list[j] = list[j], list[i]
}
var _ sort.Interface = fileInfoList(nil)
// }}}
func simplifyHTTPMethod(str string) string {
switch str {
case http.MethodOptions:
return http.MethodOptions
case http.MethodGet:
return http.MethodGet
case http.MethodHead:
return http.MethodHead
case http.MethodPost:
return http.MethodPost
case http.MethodPut:
return http.MethodPut
case http.MethodPatch:
return http.MethodPatch
case http.MethodDelete:
return http.MethodDelete
default:
return constants.MethodOTHER
}
}
func simplifyHTTPStatusCode(statusCode int) string {
switch statusCode {
case 100:
return constants.Status100
case 101:
return constants.Status101
case 0, 200:
return constants.Status200
case 204:
return constants.Status204
case 206:
return constants.Status206
case 301:
return constants.Status301
case 302:
return constants.Status302
case 304:
return constants.Status304
case 307:
return constants.Status307
case 308:
return constants.Status308
case 400:
return constants.Status400
case 401:
return constants.Status401
case 403:
return constants.Status403
case 404:
return constants.Status404
case 405:
return constants.Status405
case 500:
return constants.Status500
case 503:
return constants.Status503
}
switch {
case statusCode < 200:
return constants.Status1XX
case statusCode < 300:
return constants.Status2XX
case statusCode < 400:
return constants.Status3XX
case statusCode < 500:
return constants.Status4XX
default:
return constants.Status5XX
}
}
func simplifyFrontendKey(key string) string {
switch {
case strings.HasPrefix(key, "ERROR:"):
return "!ERROR"
case strings.HasPrefix(key, "REDIR:"):
return "!REDIR"
default:
return key
}
}
func toHTTPError(err error) int {
switch {
case os.IsNotExist(err):
return http.StatusNotFound
case os.IsPermission(err):
return http.StatusForbidden
default:
return http.StatusInternalServerError
}
}
func runeLen(str string) int {
var length int
for _, ch := range str {
_ = ch
length++
}
return length
}
func trimContentHeader(str string) string {
i := strings.IndexByte(str, ';')
if i >= 0 {
str = str[:i]
}
return strings.TrimSpace(str)
}
func hexToBase64(in string) string {
raw, err := hex.DecodeString(in)
if err != nil {
panic(err)
}
return base64.StdEncoding.EncodeToString(raw)
}
func appendHeadersToKV(kv []*roxy_v0.KeyValue, h http.Header) []*roxy_v0.KeyValue {
list := make([]string, 0, len(h))
valueMap := make(map[string][]string, len(h))
for key, values := range h {
name := strings.ToLower(key)
list = append(list, name)
valueMap[name] = values
}
sort.Strings(list)
for _, name := range list {
for _, value := range valueMap[name] {
kv = append(kv, &roxy_v0.KeyValue{Key: name, Value: value})
}
}
return kv
}
func readXattr(f http.File, attr string) ([]byte, error) {
fdable, ok := f.(interface{ Fd() uintptr })
if !ok {
return nil, syscall.ENOTSUP
}
dest := make([]byte, 256)
for {
n, err := unix.Fgetxattr(int(fdable.Fd()), attr, dest)
switch {
case err == nil && n < len(dest):
return dest[:n], nil
case err == nil:
if len(dest) >= 65536 {
return nil, syscall.ERANGE
}
dest = make([]byte, 2*len(dest))
case errors.Is(err, syscall.ERANGE):
if len(dest) >= 65536 {
return nil, err
}
dest = make([]byte, 2*len(dest))
case errors.Is(err, syscall.EINTR):
// pass
default:
return nil, err
}
}
}
func readLinkAt(dir http.File, name string) (string, error) {
fdable, ok := dir.(interface{ Fd() uintptr })
if !ok {
return "", syscall.ENOTSUP
}
dest := make([]byte, 256)
for {
n, err := unix.Readlinkat(int(fdable.Fd()), name, dest)
switch {
case err == nil && n < len(dest):
return string(dest[:n]), nil
case err == nil:
if len(dest) >= 65536 {
return "", syscall.ERANGE
}
dest = make([]byte, 2*len(dest))
case errors.Is(err, syscall.EINTR):
// pass
default:
return "", err
}
}
}
func setDigestHeader(h http.Header, algo enums.DigestType, b64 string) {
h.Add(constants.HeaderDigest, fmt.Sprintf("%s=%s", algo, b64))
}
func setETagHeader(h http.Header, prefix string, lastMod time.Time) {
if h.Get(constants.HeaderETag) != "" {
return
}
var (
haveMD5 bool
haveSHA1 bool
haveSHA256 bool
sumMD5 string
sumSHA1 string
sumSHA256 string
)
for _, row := range h.Values(constants.HeaderDigest) {
switch {
case strings.HasPrefix(row, "md5="):
haveMD5 = true
sumMD5 = row[4:]
case strings.HasPrefix(row, "sha1="):
haveSHA1 = true
sumSHA1 = row[5:]
case strings.HasPrefix(row, "sha256="):
haveSHA256 = true
sumSHA256 = row[7:]
}
}
if haveSHA256 {
h.Set(constants.HeaderETag, strconv.Quote(prefix+"Z."+sumSHA256[:16]))
return
}
if haveSHA1 {
h.Set(constants.HeaderETag, strconv.Quote(prefix+"Y."+sumSHA1[:16]))
return
}
if haveMD5 {
h.Set(constants.HeaderETag, strconv.Quote(prefix+"X."+sumMD5[:16]))
return
}
h.Set(constants.HeaderETag, fmt.Sprintf("W/%q", lastMod.UTC().Format("2006.01.02.15.04.05")))
}
func addrWithNoPort(addr net.Addr) string {
if tcpAddr, ok := addr.(*net.TCPAddr); ok {
if tcpAddr.Zone == "" {
return tcpAddr.IP.String()
}
return tcpAddr.IP.String() + "%" + tcpAddr.Zone
}
return addr.String()
}
func quoteForwardedAddr(addr net.Addr) string {
if tcpAddr, ok := addr.(*net.TCPAddr); ok {
str := tcpAddr.IP.String()
if tcpAddr.Zone != "" {
str += "%" + tcpAddr.Zone
}
if tcpAddr.Zone != "" || isIPv6(tcpAddr.IP) {
str = strconv.Quote(str)
}
return str
}
return addr.String()
}
func isIPv6(ip net.IP) bool {
if len(ip) < 16 {
return false
}
if ip4 := ip.To4(); ip4 != nil {
return false
}
return true
}