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package repository
import (
"fmt"
"io"
)
const idLengthSHA1 = 40
const idLengthSHA256 = 64
// Hash is a git hash
type Hash string
func (h Hash) String() string {
return string(h)
}
// UnmarshalGQL implement the Unmarshaler interface for gqlgen
func (h *Hash) UnmarshalGQL(v interface{}) error {
_, ok := v.(string)
if !ok {
return fmt.Errorf("hashes must be strings")
}
*h = v.(Hash)
if !h.IsValid() {
return fmt.Errorf("invalid hash")
}
return nil
}
// MarshalGQL implement the Marshaler interface for gqlgen
func (h Hash) MarshalGQL(w io.Writer) {
_, _ = w.Write([]byte(`"` + h.String() + `"`))
}
// IsValid tell if the hash is valid
func (h *Hash) IsValid() bool {
// Support for both sha1 and sha256 git hashes
if len(*h) != idLengthSHA1 && len(*h) != idLengthSHA256 {
return false
}
for _, r := range *h {
if (r < 'a' || r > 'f') && (r < '0' || r > '9') {
return false
}
}
return true
}
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