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package http
import (
"fmt"
nixhash "github.com/nix-community/go-nix/pkg/hash"
)
// parseNarHashFromUrl parses a nixbase32 string representing a sha256 NarHash
// and returns a nixhash.Hash when it was able to parse, or an error.
func parseNarHashFromUrl(narHashFromUrl string) (*nixhash.Hash, error) {
// peek at the length. If it's 52 characters, assume sha256,
// if it's something else, this is an error.
l := len(narHashFromUrl)
if l != 52 {
return nil, fmt.Errorf("invalid length of narHash: %v", l)
}
nixHash, err := nixhash.ParseNixBase32("sha256:" + narHashFromUrl)
if err != nil {
return nil, fmt.Errorf("unable to parse nixbase32 hash: %w", err)
}
return nixHash, nil
}
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