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40 lines
932 B
40 lines
932 B
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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