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package internal
import (
"expvar"
"net/http"
"strconv"
"strings"
"tailscale.com/metrics"
)
var (
acceptEncodings = &metrics.LabelMap{Label: "encoding"}
validEncodings = []string{
"gzip",
"x-gzip",
"deflate",
"br",
"identity",
"snappy",
"bzip2",
"lzma",
"zstd",
}
)
func init() {
expvar.Publish("gauge_xesite_accept_encoding", acceptEncodings)
}
func inValidEncodings(enc string) bool {
for _, validEnc := range validEncodings {
if enc == validEnc {
return true
}
}
return false
}
func AcceptEncodingMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
for _, enc := range ParseAcceptEncoding(r.Header.Get("Accept-Encoding")) {
if !inValidEncodings(enc.Encoding) {
continue
}
acceptEncodings.Add(enc.Encoding, 1)
}
next.ServeHTTP(w, r)
})
}
type EncodingQ struct {
Encoding string
Q float64
}
func ParseAcceptEncoding(acptEnc string) []EncodingQ {
var eqs []EncodingQ
encQStrs := strings.Split(acptEnc, ",")
for _, encQStr := range encQStrs {
trimedEncQStr := strings.Trim(encQStr, " ")
encQ := strings.Split(trimedEncQStr, ";")
if len(encQ) == 1 {
eq := EncodingQ{encQ[0], 1}
eqs = append(eqs, eq)
} else {
qp := strings.Split(encQ[1], "=")
q, err := strconv.ParseFloat(qp[1], 64)
if err != nil {
panic(err)
}
eq := EncodingQ{encQ[0], q}
eqs = append(eqs, eq)
}
}
return eqs
}
type LangQ struct {
Lang string
Q float64
}
func ParseAcceptLanguage(acptLang string) []LangQ {
var lqs []LangQ
langQStrs := strings.Split(acptLang, ",")
for _, langQStr := range langQStrs {
trimedLangQStr := strings.Trim(langQStr, " ")
langQ := strings.Split(trimedLangQStr, ";")
if len(langQ) == 1 {
lq := LangQ{langQ[0], 1}
lqs = append(lqs, lq)
} else {
qp := strings.Split(langQ[1], "=")
q, err := strconv.ParseFloat(qp[1], 64)
if err != nil {
panic(err)
}
lq := LangQ{langQ[0], q}
lqs = append(lqs, lq)
}
}
return lqs
}
|
