105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
package middleware
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import (
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"strconv"
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"strings"
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"git.ma-al.com/goc_daniel/b2b/app/model"
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"git.ma-al.com/goc_daniel/b2b/app/service/langsService"
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constdata "git.ma-al.com/goc_daniel/b2b/app/utils/const_data"
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"github.com/gofiber/fiber/v3"
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)
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// LanguageMiddleware discovers client's language and stores it in context
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// Priority: Query param > Cookie > Accept-Language header > Default language
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func LanguageMiddleware() fiber.Handler {
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langService := langsService.LangSrv
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return func(c fiber.Ctx) error {
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var langID uint
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// 1. Check query parameter
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langIDStr := c.Query("lang_id", "")
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if langIDStr != "" {
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if id, err := strconv.ParseUint(langIDStr, 10, 32); err == nil {
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langID = uint(id)
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if langID > 0 {
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c.Locals(constdata.USER_LOCALE, returnNewLocale(langID))
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return c.Next()
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}
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}
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}
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// 2. Check cookie
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cookieLang := c.Cookies("lang_id", "")
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if cookieLang != "" {
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if id, err := strconv.ParseUint(cookieLang, 10, 32); err == nil {
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langID = uint(id)
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if langID > 0 {
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c.Locals(constdata.USER_LOCALE, returnNewLocale(langID))
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return c.Next()
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}
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}
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}
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// 3. Check Accept-Language header
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acceptLang := c.Get("Accept-Language", "")
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if acceptLang != "" {
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// Parse the Accept-Language header (e.g., "en-US,en;q=0.9,pl;q=0.8")
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isoCode := parseAcceptLanguage(acceptLang)
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if isoCode != "" {
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lang, err := langService.GetLanguageByISOCode(isoCode)
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if err == nil && lang != nil {
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langID = uint(lang.ID)
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c.Locals(constdata.USER_LOCALE, returnNewLocale(langID))
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return c.Next()
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}
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}
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}
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// 4. Fall back to default language
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defaultLang, err := langService.GetDefaultLanguage()
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if err == nil && defaultLang != nil {
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langID = uint(defaultLang.ID)
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c.Locals(constdata.USER_LOCALE, returnNewLocale(langID))
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}
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return c.Next()
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}
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}
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// parseAcceptLanguage extracts the primary language ISO code from Accept-Language header
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func parseAcceptLanguage(header string) string {
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// Split by comma
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parts := strings.Split(header, ",")
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if len(parts) == 0 {
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return ""
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}
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// Get the first part (highest priority)
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first := strings.TrimSpace(parts[0])
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if first == "" {
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return ""
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}
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// Remove any quality value (e.g., ";q=0.9")
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if idx := strings.Index(first, ";"); idx != -1 {
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first = strings.TrimSpace(first[:idx])
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}
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// Handle cases like "en-US" or "en"
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// Return the primary language code (first part before dash)
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if idx := strings.Index(first, "-"); idx != -1 {
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return strings.ToLower(first[:idx])
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}
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return strings.ToLower(first)
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}
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func returnNewLocale(lang_id uint) *model.UserLocale {
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newLocale := model.UserLocale{}
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newLocale.OriginalUser = &model.Customer{}
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newLocale.OriginalUser.LangID = lang_id
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return &newLocale
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}
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