func ipnsEntryDataForSig(e *pb.IpnsEntry) []byte {
return bytes.Join([][]byte{
e.Value,
e.Validity,
[]byte(fmt.Sprint(e.GetValidityType())),
},
[]byte{})
}
// Resolve implements Resolver. Uses the IPFS routing system to resolve SFS-like
// names.
func (r *routingResolver) Resolve(name string) (string, error) {
log.Debugf("RoutingResolve: '%s'", name)
ctx := context.TODO()
hash, err := mh.FromB58String(name)
if err != nil {
log.Warning("RoutingResolve: bad input hash: [%s]\n", name)
return "", err
}
// name should be a multihash. if it isn't, error out here.
// use the routing system to get the name.
// /ipns/<name>
h := []byte("/ipns/" + string(hash))
ipnsKey := u.Key(h)
val, err := r.routing.GetValue(ctx, ipnsKey)
if err != nil {
log.Warning("RoutingResolve get failed.")
return "", err
}
entry := new(pb.IpnsEntry)
err = proto.Unmarshal(val, entry)
if err != nil {
return "", err
}
// name should be a public key retrievable from ipfs
// /ipfs/<name>
key := u.Key("/pk/" + string(hash))
pkval, err := r.routing.GetValue(ctx, key)
if err != nil {
log.Warning("RoutingResolve PubKey Get failed.")
return "", err
}
// get PublicKey from node.Data
pk, err := ci.UnmarshalPublicKey(pkval)
if err != nil {
return "", err
}
hsh, _ := pk.Hash()
log.Debugf("pk hash = %s", u.Key(hsh))
// check sig with pk
if ok, err := pk.Verify(ipnsEntryDataForSig(entry), entry.GetSignature()); err != nil || !ok {
return "", fmt.Errorf("Invalid value. Not signed by PrivateKey corresponding to %v", pk)
}
// ok sig checks out. this is a valid name.
return string(entry.GetValue()), nil
}
func createRoutingEntryData(pk ci.PrivKey, val string) ([]byte, error) {
entry := new(pb.IpnsEntry)
entry.Value = []byte(val)
typ := pb.IpnsEntry_EOL
entry.ValidityType = &typ
entry.Validity = []byte(u.FormatRFC3339(time.Now().Add(time.Hour * 24)))
sig, err := pk.Sign(ipnsEntryDataForSig(entry))
if err != nil {
return nil, err
}
entry.Signature = sig
return proto.Marshal(entry)
}
// ValidateIpnsRecord implements ValidatorFunc and verifies that the
// given 'val' is an IpnsEntry and that that entry is valid.
func ValidateIpnsRecord(k u.Key, val []byte) error {
entry := new(pb.IpnsEntry)
err := proto.Unmarshal(val, entry)
if err != nil {
return err
}
switch entry.GetValidityType() {
case pb.IpnsEntry_EOL:
t, err := u.ParseRFC3339(string(entry.GetValue()))
if err != nil {
log.Error("Failed parsing time for ipns record EOL")
return err
}
if time.Now().After(t) {
return ErrExpiredRecord
}
default:
return ErrUnrecognizedValidity
}
return nil
}
