func addressBytesToString(p Protocol, b []byte) (string, error) {
switch p.Code {
// ipv4,6
case P_IP4, P_IP6:
return net.IP(b).String(), nil
// tcp udp dccp sctp
case P_TCP, P_UDP, P_DCCP, P_SCTP:
i := binary.BigEndian.Uint16(b)
return strconv.Itoa(int(i)), nil
case P_IPFS: // ipfs
// the address is a varint-prefixed multihash string representation
size, n := ReadVarintCode(b)
b = b[n:]
if len(b) != size {
panic("inconsistent lengths")
}
m, err := mh.Cast(b)
if err != nil {
return "", err
}
return m.B58String(), nil
}
return "", fmt.Errorf("unknown protocol")
}
// 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
}
// resolveOnce implements resolver. Uses the IPFS routing system to
// resolve SFS-like names.
func (r *routingResolver) resolveOnce(ctx context.Context, name string) (path.Path, error) {
log.Debugf("RoutingResolve: '%s'", name)
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 := key.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
pubkey, err := routing.GetPublicKey(r.routing, ctx, hash)
if err != nil {
return "", err
}
hsh, _ := pubkey.Hash()
log.Debugf("pk hash = %s", key.Key(hsh))
// check sig with pk
if ok, err := pubkey.Verify(ipnsEntryDataForSig(entry), entry.GetSignature()); err != nil || !ok {
return "", fmt.Errorf("Invalid value. Not signed by PrivateKey corresponding to %v", pubkey)
}
// ok sig checks out. this is a valid name.
// check for old style record:
valh, err := mh.Cast(entry.GetValue())
if err != nil {
// Not a multihash, probably a new record
return path.ParsePath(string(entry.GetValue()))
} else {
// Its an old style multihash record
log.Warning("Detected old style multihash record")
return path.FromKey(key.Key(valh)), nil
}
}
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)
}
}
func ParseKeyToPath(txt string) (Path, error) {
if txt == "" {
return "", ErrNoComponents
}
chk := b58.Decode(txt)
if len(chk) == 0 {
return "", errors.New("not a key")
}
if _, err := mh.Cast(chk); err != nil {
return "", err
}
return FromKey(key.Key(chk)), nil
}
// Unmarshal decodes raw data into a *Node instance.
// The conversion uses an intermediate PBNode.
func (n *Node) Unmarshal(encoded []byte) error {
var pbn pb.PBNode
if err := pbn.Unmarshal(encoded); err != nil {
return fmt.Errorf("Unmarshal failed. %v", err)
}
pbnl := pbn.GetLinks()
n.Links = make([]*Link, len(pbnl))
for i, l := range pbnl {
n.Links[i] = &Link{Name: l.GetName(), Size: l.GetTsize()}
h, err := mh.Cast(l.GetHash())
if err != nil {
return fmt.Errorf("Link hash is not valid multihash. %v", err)
}
n.Links[i].Hash = h
}
sort.Stable(LinkSlice(n.Links)) // keep links sorted
n.Data = pbn.GetData()
return nil
}
// IDFromBytes cast a string to ID type, and validate
// the id to make sure it is a multihash.
func IDFromBytes(b []byte) (ID, error) {
if _, err := mh.Cast(b); err != nil {
return ID(""), err
}
return ID(b), nil
}