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package util
import (
"fmt"
"io"
)
type Hash string
func (h Hash) String() string {
return string(h)
}
func (h *Hash) UnmarshalGQL(v interface{}) error {
_, ok := v.(string)
if !ok {
return fmt.Errorf("labels must be strings")
}
*h = v.(Hash)
if !h.IsValid() {
return fmt.Errorf("invalid hash")
}
return nil
}
func (h Hash) MarshalGQL(w io.Writer) {
w.Write([]byte(`"` + h.String() + `"`))
}
func (h *Hash) IsValid() bool {
if len(*h) != 40 {
return false
}
for _, r := range *h {
if (r < 'a' || r > 'z') && (r < '0' || r > '9') {
return false
}
}
return true
}
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