61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
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// Package http detect localized from http header
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// and set localized info to metadata as key 'locale'
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// The locale used following the specification defined at
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// http://www.rfc-editor.org/rfc/bcp/bcp47.txt.
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// Examples are: "en-US", "fr-CH", "es-MX"
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package http
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import (
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"net/url"
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"sort"
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"strconv"
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"strings"
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bm "go-common/library/net/http/blademaster"
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)
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type language struct {
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Name string
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Weighting float64
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}
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// detectLocalizedWeb detect locale from HTTP Accept-Language header
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// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Language
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func detectLocalizedWeb(c *bm.Context) (langs []string) {
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parseLang := func(s string) (language, error) {
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seps := strings.SplitN(s, ";", 2)
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lang := language{Name: seps[0]}
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if len(seps) == 1 {
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lang.Weighting = 1
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return lang, nil
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}
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params, err := url.ParseQuery(seps[1])
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if err != nil {
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return lang, err
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}
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lang.Weighting, err = strconv.ParseFloat(params.Get("q"), 32)
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return lang, err
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}
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items := strings.Split(c.Request.Header.Get("Accept-Language"), ",")
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if items[0] == "" {
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return
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}
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// three language is most common accept language send by browser
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languages := make([]language, 0, len(items))
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for _, s := range items {
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l, err := parseLang(s)
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if err != nil {
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//TODO(weicheng): deal with error
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continue
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}
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languages = append(languages, l)
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}
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sort.Slice(languages, func(i, j int) bool {
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return languages[i].Weighting > languages[j].Weighting
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})
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for i := range languages {
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langs = append(langs, languages[i].Name)
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}
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return
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}
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