19a985ad49
- internal/gemini/ → internal/adapters/openai/ (renamed package to openai) - internal/pexels/ → internal/adapters/pexels/ - internal/config/ → internal/infra/config/ - internal/database/ → internal/infra/database/ - internal/locale/ → internal/infra/locale/ - internal/middleware/ → internal/infra/middleware/ - internal/server/ → internal/infra/server/ All import paths and call sites updated accordingly. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
103 lines
2.9 KiB
Go
103 lines
2.9 KiB
Go
package locale
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import (
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"context"
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"fmt"
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"net/http"
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"strings"
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"github.com/jackc/pgx/v5/pgxpool"
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)
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// Default is the fallback language when no supported language is detected.
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const Default = "en"
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// Supported is the set of language codes the application currently handles.
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// Keys are ISO 639-1 two-letter codes (lower-case).
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// Populated by LoadFromDB at server startup.
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var Supported = map[string]bool{
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"en": true,
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"ru": true,
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}
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// Language is a supported language record loaded from the DB.
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type Language struct {
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Code string
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NativeName string
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EnglishName string
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}
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// Languages is the ordered list of active languages.
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// Populated by LoadFromDB at server startup.
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var Languages []Language
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// LoadFromDB queries the languages table and updates both Supported and Languages.
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// Must be called once at startup before the server begins accepting requests.
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func LoadFromDB(ctx context.Context, pool *pgxpool.Pool) error {
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rows, err := pool.Query(ctx,
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`SELECT code, native_name, english_name FROM languages WHERE is_active ORDER BY sort_order`)
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if err != nil {
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return fmt.Errorf("load languages from db: %w", err)
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}
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defer rows.Close()
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newSupported := map[string]bool{}
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var newLanguages []Language
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for rows.Next() {
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var l Language
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if err := rows.Scan(&l.Code, &l.NativeName, &l.EnglishName); err != nil {
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return err
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}
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newSupported[l.Code] = true
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newLanguages = append(newLanguages, l)
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}
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if err := rows.Err(); err != nil {
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return err
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}
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Supported = newSupported
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Languages = newLanguages
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return nil
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}
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type contextKey struct{}
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// Parse returns the best-matching supported language from an Accept-Language
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// header value. It iterates through the comma-separated list in preference
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// order and returns the first entry whose primary subtag is in Supported.
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// Returns Default when the header is empty or no match is found.
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func Parse(acceptLang string) string {
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if acceptLang == "" {
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return Default
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}
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for part := range strings.SplitSeq(acceptLang, ",") {
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// Strip quality value (e.g. ";q=0.9").
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tag := strings.TrimSpace(strings.SplitN(part, ";", 2)[0])
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// Use only the primary subtag (e.g. "ru" from "ru-RU").
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lang := strings.ToLower(strings.SplitN(tag, "-", 2)[0])
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if Supported[lang] {
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return lang
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}
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}
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return Default
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}
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// WithLang returns a copy of ctx carrying the given language code.
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func WithLang(ctx context.Context, lang string) context.Context {
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return context.WithValue(ctx, contextKey{}, lang)
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}
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// FromContext returns the language stored in ctx.
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// Returns Default when no language has been set.
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func FromContext(ctx context.Context) string {
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if lang, ok := ctx.Value(contextKey{}).(string); ok && lang != "" {
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return lang
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}
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return Default
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}
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// FromRequest extracts the preferred language from the request's
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// Accept-Language header.
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func FromRequest(r *http.Request) string {
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return Parse(r.Header.Get("Accept-Language"))
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}
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