I18N

+ Added language detection and default language

Tools/Init.go

@@ -31,4 +31,7 @@ func init() {
 	allHostsIPAddresses := ReadAllIPAddresses4ThisHost()
 	port := ConfigurationDB.Read(`PublicWebServerPort`)
 	localIPAddressAndPort = allHostsIPAddresses[0] + `:` + port
+
+	// Read the default language:
+	defaultLanguage = ConfigurationDB.Read(`DefaultLanguageCode`)
 }

Tools/RequestLanguage.go

@@ -0,0 +1,51 @@
+package Tools
+
+import (
+	"net/http"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+func GetRequestLanguage(request *http.Request) (resultLangs Languages) {
+	languageCodeForm := request.FormValue(`lang`)
+	languageCodeHeader := request.Header.Get(`Accept-Language`)
+
+	if languageCodeForm != `` && ((len(languageCodeForm) == 2) || (len(languageCodeForm) == 5 && strings.Contains(languageCodeForm, `-`))) {
+		resultLangs = make(Languages, 1)
+		resultLangs[0].Factor = 1.0
+		resultLangs[0].Language = strings.ToLower(languageCodeForm)
+		return
+	}
+
+	if languageCodeHeader == `` {
+		resultLangs = make(Languages, 1)
+		resultLangs[0].Factor = 1.0
+		resultLangs[0].Language = defaultLanguage
+		return
+	}
+
+	values := strings.Split(languageCodeHeader, `,`)
+	langs := make(Languages, len(values))
+	for n, langData := range values {
+		if factorData := strings.Split(langData, `;q=`); len(factorData) == 2 {
+			if factor, errFactor := strconv.ParseFloat(factorData[1], 32); errFactor != nil {
+				langs[n] = Language{}
+				langs[n].Language = strings.ToLower(strings.Trim(factorData[0], ` `))
+				langs[n].Factor = 1.0
+			} else {
+				langs[n] = Language{}
+				langs[n].Language = strings.ToLower(strings.Trim(factorData[0], ` `))
+				langs[n].Factor = float32(factor)
+			}
+		} else {
+			langs[n] = Language{}
+			langs[n].Language = strings.ToLower(strings.Trim(langData, ` `))
+			langs[n].Factor = 1.0
+		}
+	}
+
+	sort.Sort(langs)
+	resultLangs = langs
+	return
+}

Tools/ResponseLanguage.go

@@ -0,0 +1,9 @@
+package Tools
+
+import (
+	"net/http"
+)
+
+func SendChosenLanguage(response http.ResponseWriter, lang Language) {
+	response.Header().Add(`Content-Language`, lang.Language)
+}

Tools/SchemeLanguage.go

@@ -0,0 +1,20 @@
+package Tools
+
+type Language struct {
+	Language string
+	Factor   float32
+}
+
+type Languages []Language
+
+func (lang Languages) Len() int {
+	return len(lang)
+}
+
+func (lang Languages) Less(i, j int) bool {
+	return lang[i].Factor > lang[j].Factor
+}
+
+func (lang Languages) Swap(i, j int) {
+	lang[i], lang[j] = lang[j], lang[i]
+}

Tools/Variables.go

@@ -10,4 +10,5 @@ var (
 	localIPAddressAndPort string    = `127.0.0.1:60000`
 	ipAddresses           []string  = nil
 	internalCommPassword  string    = ``
+	defaultLanguage       string    = `en`
 )