func parseKey(maybe string) (Key, error) {
h, err := mh.FromB58String(maybe)
if err != nil {
return nil, err
}
return &mhKey{mh: h}, nil
}
// ResolvePath fetches the node for given path. It uses the first
// path component as a hash (key) of the first node, then resolves
// all other components walking the links, with ResolveLinks.
func (s *Resolver) ResolvePath(fpath string) (*merkledag.Node, error) {
log.Debugf("Resolve: '%s'", fpath)
fpath = path.Clean(fpath)
parts := strings.Split(fpath, "/")
// skip over empty first elem
if len(parts[0]) == 0 {
parts = parts[1:]
}
// if nothing, bail.
if len(parts) == 0 {
return nil, fmt.Errorf("ipfs path must contain at least one component")
}
// first element in the path is a b58 hash (for now)
h, err := mh.FromB58String(parts[0])
if err != nil {
log.Debug("given path element is not a base58 string.\n")
return nil, err
}
log.Debug("Resolve dag get.\n")
nd, err := s.DAG.Get(u.Key(h))
if err != nil {
return nil, err
}
return s.ResolveLinks(nd, parts[1:])
}
// 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
}
// Publish implements Publisher. Accepts a keypair and a value,
// and publishes it out to the routing system
func (p *ipnsPublisher) Publish(k ci.PrivKey, value string) error {
log.Debugf("namesys: Publish %s", value)
// validate `value` is a ref (multihash)
_, err := mh.FromB58String(value)
if err != nil {
log.Errorf("hash cast failed: %s", value)
return fmt.Errorf("publish value must be str multihash. %v", err)
}
ctx := context.TODO()
data, err := createRoutingEntryData(k, value)
if err != nil {
log.Error("entry creation failed.")
return err
}
pubkey := k.GetPublic()
pkbytes, err := pubkey.Bytes()
if err != nil {
log.Error("pubkey getbytes failed.")
return err
}
nameb := u.Hash(pkbytes)
namekey := u.Key("/pk/" + string(nameb))
log.Debugf("Storing pubkey at: %s", namekey)
// Store associated public key
timectx, _ := context.WithDeadline(ctx, time.Now().Add(time.Second*4))
err = p.routing.PutValue(timectx, namekey, pkbytes)
if err != nil {
return err
}
ipnskey := u.Key("/ipns/" + string(nameb))
log.Debugf("Storing ipns entry at: %s", ipnskey)
// Store ipns entry at "/ipns/"+b58(h(pubkey))
timectx, _ = context.WithDeadline(ctx, time.Now().Add(time.Second*4))
err = p.routing.PutValue(timectx, ipnskey, data)
if err != nil {
return err
}
return nil
}
// converts the Node object into a real dag.Node
func deserializeNode(node *Node) (*dag.Node, error) {
dagnode := new(dag.Node)
dagnode.Data = node.Data
dagnode.Links = make([]*dag.Link, len(node.Links))
for i, link := range node.Links {
hash, err := mh.FromB58String(link.Hash)
if err != nil {
return nil, err
}
dagnode.Links[i] = &dag.Link{
Name: link.Name,
Size: link.Size,
Hash: hash,
}
}
return dagnode, nil
}
func bootstrapInputToPeers(input []string) ([]*config.BootstrapPeer, error) {
split := func(addr string) (string, string) {
idx := strings.LastIndex(addr, "/")
if idx == -1 {
return "", addr
}
return addr[:idx], addr[idx+1:]
}
peers := []*config.BootstrapPeer{}
for _, addr := range input {
addrS, peeridS := split(addr)
// make sure addrS parses as a multiaddr.
if len(addrS) > 0 {
maddr, err := ma.NewMultiaddr(addrS)
if err != nil {
return nil, err
}
addrS = maddr.String()
}
// make sure idS parses as a peer.ID
_, err := mh.FromB58String(peeridS)
if err != nil {
return nil, err
}
// construct config entry
peers = append(peers, &config.BootstrapPeer{
Address: addrS,
PeerID: peeridS,
})
}
return peers, nil
}
Arguments: []cmds.Argument{
cmds.StringArg("key", true, false, "The base58 multihash of an existing block to get"),
},
Run: func(req cmds.Request) (interface{}, error) {
n, err := req.Context().GetNode()
if err != nil {
return nil, err
}
key := req.Arguments()[0]
if !u.IsValidHash(key) {
return nil, cmds.Error{"Not a valid hash", cmds.ErrClient}
}
h, err := mh.FromB58String(key)
if err != nil {
return nil, err
}
k := u.Key(h)
ctx, _ := context.WithTimeout(context.TODO(), time.Second*5)
b, err := n.Blocks.GetBlock(ctx, k)
if err != nil {
return nil, err
}
log.Debugf("BlockGet key: '%q'", b.Key())
return bytes.NewReader(b.Data), nil
},
}
// CanResolve implements Resolver. Checks whether name is a b58 encoded string.
func (r *routingResolver) CanResolve(name string) bool {
_, err := mh.FromB58String(name)
return err == nil
}