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41 lines
932 B
41 lines
932 B
3 years ago
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package deeplink
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import (
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"github.com/go-faster/errors"
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"github.com/gotd/td/internal/ascii"
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)
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// ValidateDomain validate given domain (user) name
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func ValidateDomain(domain string) error {
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return checkDomainSymbols(domain)
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}
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// checkDomainSymbols check that domain contains only a-z, A-Z, 0-9 and '_'
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// symbols.
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func checkDomainSymbols(domain string) error {
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switch {
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case domain == "":
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return errors.New("is empty")
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case len(domain) > 32:
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return errors.New("is too big")
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case !ascii.IsLatinLower(rune(domain[0])):
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return errors.New("must start with lower letter")
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case domain[len(domain)-1] == '_':
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return errors.New("must not end with '_'")
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}
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for i, r := range domain {
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switch {
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case !ascii.IsLatinLetter(r) && !ascii.IsDigit(r) && r != '_':
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case i > 0 && domain[i] == '_' && domain[i] == domain[i-1]:
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default:
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continue
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}
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return errors.Errorf("unexpected %c at %d", r, i)
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}
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return nil
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}
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