// InvertKey returns a b58 decoded Datastore key
// TODO: this is hacky because it encodes every path component. some
// path components may be proper strings already...
func (b58KeyConverter) InvertKey(dsk ds.Key) ds.Key {
k := ds.NewKey("/")
for _, n := range dsk.Namespaces() {
k = k.ChildString(string(b58.Decode(n)))
}
return k
}
// IsValidHash checks whether a given hash is valid (b58 decodable, len > 0)
func IsValidHash(s string) bool {
out := b58.Decode(s)
if out == nil || len(out) == 0 {
return false
}
_, err := mh.Cast(out)
if err != nil {
return false
}
return true
}
// UnmarshalJSON returns a JSON-encoded Key (string)
func (k *Key) UnmarshalJSON(mk []byte) error {
var s string
err := json.Unmarshal(mk, &s)
if err != nil {
return err
}
*k = Key(string(b58.Decode(s)))
if len(*k) == 0 && len(s) > 2 { // if b58.Decode fails, k == ""
return fmt.Errorf("Key.UnmarshalJSON: invalid b58 string: %v", mk)
}
return nil
}
func FromB58String(s string) (m Multihash, err error) {
// panic handler, in case we try accessing bytes incorrectly.
defer func() {
if e := recover(); e != nil {
m = Multihash{}
err = e.(error)
}
}()
//b58 smells like it can panic...
b := b58.Decode(s)
return Cast(b)
}
func Decode(encoding, digest string) (mh.Multihash, error) {
switch encoding {
case "raw":
return mh.Cast([]byte(digest))
case "hex":
return hex.DecodeString(digest)
case "base58":
return base58.Decode(digest), nil
case "base64":
return base64.StdEncoding.DecodeString(digest)
default:
return nil, fmt.Errorf("unknown encoding: %s", encoding)
}
}
// B58KeyDecode returns Key from a b58 encoded string
func B58KeyDecode(s string) Key {
return Key(string(b58.Decode(s)))
}