clawbot
f8ce8cef83
The template's files at a77fd30, without its history or LICENSE, after script/rename simplexcalc. Model: opus-5-5
30 lines
788 B
Go
30 lines
788 B
Go
package config
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import (
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"encoding/hex"
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"errors"
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"fmt"
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)
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// errKeyLength is returned for a well-formed hex string of the wrong
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// length, so decodeHex has one error type for both ways of being wrong.
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var errKeyLength = errors.New("wrong key length")
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// decodeHex decodes exactly csrfKeyBytes bytes of hex. It exists as its
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// own function so that the length rule and the encoding rule are
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// enforced in one place, and so that the caller never has to decide
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// what a short-but-valid key means.
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func decodeHex(s string) ([]byte, error) {
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b, err := hex.DecodeString(s)
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if err != nil {
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return nil, fmt.Errorf("decoding hex: %w", err)
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}
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if len(b) != csrfKeyBytes {
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return nil, fmt.Errorf("%w: got %d bytes, want %d",
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errKeyLength, len(b), csrfKeyBytes)
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}
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return b, nil
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}
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