localization.go
2.66 KB
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package webutility
import (
"encoding/json"
"io/ioutil"
"net/http"
"path"
"strconv"
"strings"
"sync"
)
type Dictionary struct {
my sync.Mutex
locales map[string]map[string]string
supported []string
defaultLocale string
}
func NewDictionary(def string) *Dictionary {
d := Dictionary{
locales: map[string]map[string]string{},
}
d.defaultLocale = def
return &d
}
func (d *Dictionary) AddTranslations(directory string) error {
files, err := ioutil.ReadDir(directory)
if err != nil {
return err
}
for _, fileInfo := range files {
fName := fileInfo.Name()
path := directory + "/" + fName
file, err := ioutil.ReadFile(path)
if err != nil {
return err
}
loc := stripFileExtension(fName)
var data interface{}
err = json.Unmarshal(file, &data)
if err != nil {
return err
}
l := map[string]string{}
for k, v := range data.(map[string]interface{}) {
l[k] = v.(string)
}
mu.Lock()
defer mu.Unlock()
d.locales[loc] = l
d.supported = append(d.supported, loc)
}
if d.defaultLocale == "" {
if len(d.supported) > 0 {
d.defaultLocale = d.supported[0]
}
}
return nil
}
func (d *Dictionary) GetBestMatchLocale(req *http.Request) (best string) {
accepted := d.parseAcceptedLanguages(req.Header.Get("Accept-Language"))
for i, _ := range accepted {
if accepted[i].Code == "*" {
return d.defaultLocale
}
for j, _ := range d.supported {
if accepted[i].Code == d.supported[j] {
return d.supported[j]
}
}
}
return d.defaultLocale
}
func (d *Dictionary) Translate(loc, key string) string {
return d.locales[loc][key]
}
func (d *Dictionary) hasLocale(loc string) bool {
for _, v := range d.supported {
if v == loc {
return true
}
}
return false
}
type LangWeight struct {
Code string
Weight float64
}
func (d *Dictionary) parseAcceptedLanguages(accepted string) (langs []LangWeight) {
if accepted == "" {
langs = append(langs, LangWeight{Code: d.defaultLocale, Weight: 1.0})
return langs
}
parts := strings.Split(accepted, ",")
for i, _ := range parts {
parts[i] = strings.Trim(parts[i], " ")
var code string = ""
var weight float64 = 0.0
cw := strings.Split(parts[i], ";")
paramCount := len(cw)
if paramCount == 1 {
// default weight of 1
code = cw[0]
weight = 1.0
} else if paramCount == 2 {
// parse weight
code = cw[0]
weight, _ = strconv.ParseFloat(cw[1][2:], 64)
}
langs = append(langs, LangWeight{Code: code, Weight: weight})
}
// TODO(marko): sort langs by weights?
return langs
}
func stripFileExtension(full string) (stripped string) {
extension := path.Ext(full)
stripped = strings.TrimSuffix(full, extension)
return stripped
}