func publish(ctx context.Context, n *core.IpfsNode, k crypto.PrivKey, ref path.Path, opts *publishOpts) (*IpnsEntry, error) {
if opts.verifyExists {
// verify the path exists
_, err := core.Resolve(ctx, n, ref)
if err != nil {
return nil, err
}
}
eol := time.Now().Add(opts.pubValidTime)
err := n.Namesys.PublishWithEOL(ctx, k, ref, eol)
if err != nil {
return nil, err
}
hash, err := k.GetPublic().Hash()
if err != nil {
return nil, err
}
return &IpnsEntry{
Name: key.Key(hash).String(),
Value: ref.String(),
}, nil
}
func publish(ctx context.Context, n *core.IpfsNode, k crypto.PrivKey, ref path.Path, opts *publishOpts) (*IpnsEntry, error) {
if opts.verifyExists {
// verify the path exists
_, err := core.Resolve(ctx, n.Namesys, n.Resolver, ref)
if err != nil {
return nil, err
}
}
eol := time.Now().Add(opts.pubValidTime)
err := n.Namesys.PublishWithEOL(ctx, k, ref, eol)
if err != nil {
return nil, err
}
pid, err := peer.IDFromPrivateKey(k)
if err != nil {
return nil, err
}
return &IpnsEntry{
Name: pid.Pretty(),
Value: ref.String(),
}, nil
}
func (ns *mpns) addToDHTCache(key ci.PrivKey, value path.Path, eol time.Time) {
rr, ok := ns.resolvers["dht"].(*routingResolver)
if !ok {
// should never happen, purely for sanity
log.Panicf("unexpected type %T as DHT resolver.", ns.resolvers["dht"])
}
if rr.cache == nil {
// resolver has no caching
return
}
var err error
value, err = path.ParsePath(value.String())
if err != nil {
log.Error("could not parse path")
return
}
name, err := peer.IDFromPrivateKey(key)
if err != nil {
log.Error("while adding to cache, could not get peerid from private key")
return
}
if time.Now().Add(DefaultResolverCacheTTL).Before(eol) {
eol = time.Now().Add(DefaultResolverCacheTTL)
}
rr.cache.Add(name.Pretty(), cacheEntry{
val: value,
eol: eol,
})
}
func NewReader(path path.Path, dag mdag.DAGService, dagnode *mdag.Node, compression int) (*Reader, error) {
reader := &Reader{
signalChan: make(chan struct{}),
dag: dag,
}
var err error
if compression != gzip.NoCompression {
reader.gzipWriter, err = gzip.NewWriterLevel(&reader.buf, compression)
if err != nil {
return nil, err
}
reader.writer = tar.NewWriter(reader.gzipWriter)
} else {
reader.writer = tar.NewWriter(&reader.buf)
}
// writeToBuf will write the data to the buffer, and will signal when there
// is new data to read
_, filename := gopath.Split(path.String())
go reader.writeToBuf(dagnode, filename, 0)
return reader, nil
}
// resolveOnce implements resolver.
// TXT records for a given domain name should contain a b58
// encoded multihash.
func (r *DNSResolver) resolveOnce(ctx context.Context, name string) (path.Path, error) {
segments := strings.SplitN(name, "/", 2)
domain := segments[0]
if !isd.IsDomain(domain) {
return "", errors.New("not a valid domain name")
}
log.Infof("DNSResolver resolving %s", domain)
rootChan := make(chan lookupRes, 1)
go workDomain(r, domain, rootChan)
subChan := make(chan lookupRes, 1)
go workDomain(r, "_dnslink."+domain, subChan)
var subRes lookupRes
select {
case subRes = <-subChan:
case <-ctx.Done():
return "", ctx.Err()
}
var p path.Path
if subRes.error == nil {
p = subRes.path
} else {
var rootRes lookupRes
select {
case rootRes = <-rootChan:
case <-ctx.Done():
return "", ctx.Err()
}
if rootRes.error == nil {
p = rootRes.path
} else {
return "", ErrResolveFailed
}
}
if len(segments) > 1 {
return path.FromSegments("", strings.TrimRight(p.String(), "/"), segments[1])
} else {
return p, nil
}
}
// ResolveToKey resolves a path to a key.
//
// It first checks if the path is already in the form of just a key (<key> or
// /ipfs/<key>) and returns immediately if so. Otherwise, it falls back onto
// Resolve to perform resolution of the dagnode being referenced.
func ResolveToKey(ctx context.Context, n *IpfsNode, p path.Path) (key.Key, error) {
// If the path is simply a key, parse and return it. Parsed paths are already
// normalized (read: prepended with /ipfs/ if needed), so segment[1] should
// always be the key.
if p.IsJustAKey() {
return key.B58KeyDecode(p.Segments()[1]), nil
}
// Fall back onto regular dagnode resolution. Retrieve the second-to-last
// segment of the path and resolve its link to the last segment.
head, tail, err := p.PopLastSegment()
if err != nil {
return key.Key(""), err
}
dagnode, err := Resolve(ctx, n, head)
if err != nil {
return key.Key(""), err
}
// Extract and return the key of the link to the target dag node.
link, err := dagnode.GetNodeLink(tail)
if err != nil {
return key.Key(""), err
}
return key.Key(link.Hash), nil
}
// ResolveToKey resolves a path to a key.
//
// It first checks if the path is already in the form of just a key (<key> or
// /ipfs/<key>) and returns immediately if so. Otherwise, it falls back onto
// Resolve to perform resolution of the dagnode being referenced.
func ResolveToCid(ctx context.Context, n *IpfsNode, p path.Path) (*cid.Cid, error) {
// If the path is simply a key, parse and return it. Parsed paths are already
// normalized (read: prepended with /ipfs/ if needed), so segment[1] should
// always be the key.
if p.IsJustAKey() {
return cid.Decode(p.Segments()[1])
}
// Fall back onto regular dagnode resolution. Retrieve the second-to-last
// segment of the path and resolve its link to the last segment.
head, tail, err := p.PopLastSegment()
if err != nil {
return nil, err
}
dagnode, err := Resolve(ctx, n.Namesys, n.Resolver, head)
if err != nil {
return nil, err
}
// Extract and return the key of the link to the target dag node.
link, _, err := dagnode.ResolveLink([]string{tail})
if err != nil {
return nil, err
}
return link.Cid, nil
}
func publish(ctx context.Context, n *core.IpfsNode, k crypto.PrivKey, ref path.Path) (*IpnsEntry, error) {
// First, verify the path exists
_, err := core.Resolve(ctx, n, ref)
if err != nil {
return nil, err
}
err = n.Namesys.Publish(ctx, k, ref)
if err != nil {
return nil, err
}
hash, err := k.GetPublic().Hash()
if err != nil {
return nil, err
}
return &IpnsEntry{
Name: key.Key(hash).String(),
Value: ref.String(),
}, nil
}
// Resolve resolves the given path by parsing out protocol-specific
// entries (e.g. /ipns/<node-key>) and then going through the /ipfs/
// entries and returning the final merkledag node. Effectively
// enables /ipns/, /dns/, etc. in commands.
func Resolve(ctx context.Context, n *IpfsNode, p path.Path) (*merkledag.Node, error) {
if strings.HasPrefix(p.String(), "/ipns/") {
// resolve ipns paths
// TODO(cryptix): we sould be able to query the local cache for the path
if n.Namesys == nil {
return nil, ErrNoNamesys
}
seg := p.Segments()
if len(seg) < 2 || seg[1] == "" { // just "/<protocol/>" without further segments
return nil, path.ErrNoComponents
}
extensions := seg[2:]
resolvable, err := path.FromSegments("/", seg[0], seg[1])
if err != nil {
return nil, err
}
respath, err := n.Namesys.Resolve(ctx, resolvable.String())
if err != nil {
return nil, err
}
segments := append(respath.Segments(), extensions...)
p, err = path.FromSegments("/", segments...)
if err != nil {
return nil, err
}
}
// ok, we have an ipfs path now (or what we'll treat as one)
return n.Resolver.ResolvePath(ctx, p)
}