Ilia Denisov
28 lines
659 B
Go
28 lines
659 B
Go
package shared
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import "golang.org/x/text/language"
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const defaultPreferredLanguage = "en"
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// ResolvePreferredLanguage returns the first canonical BCP 47 language tag
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// accepted from value, or the stable "en" fallback when the input is absent,
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// malformed, or too unspecific for auth registration purposes.
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func ResolvePreferredLanguage(value string) string {
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tags, _, err := language.ParseAcceptLanguage(value)
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if err != nil {
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return defaultPreferredLanguage
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}
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for _, tag := range tags {
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canonical := tag.String()
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switch canonical {
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case "", "und", "mul":
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continue
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default:
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return canonical
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}
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}
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return defaultPreferredLanguage
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}
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