// 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)
if !isd.IsDomain(segments[0]) {
return "", errors.New("not a valid domain name")
}
log.Infof("DNSResolver resolving %s", segments[0])
txt, err := r.lookupTXT(segments[0])
if err != nil {
return "", err
}
for _, t := range txt {
p, err := parseEntry(t)
if err == nil {
if len(segments) > 1 {
return path.FromSegments("", strings.TrimRight(p.String(), "/"), segments[1])
}
return p, nil
}
}
return "", ErrResolveFailed
}
func TestRecurivePathResolution(t *testing.T) {
ctx := context.Background()
dstore := sync.MutexWrap(datastore.NewMapDatastore())
bstore := blockstore.NewBlockstore(dstore)
bserv, err := blockservice.New(bstore, offline.Exchange(bstore))
if err != nil {
t.Fatal(err)
}
dagService := merkledag.NewDAGService(bserv)
a, _ := randNode()
b, _ := randNode()
c, cKey := randNode()
err = b.AddNodeLink("grandchild", c)
if err != nil {
t.Fatal(err)
}
err = a.AddNodeLink("child", b)
if err != nil {
t.Fatal(err)
}
err = dagService.AddRecursive(a)
if err != nil {
t.Fatal(err)
}
aKey, err := a.Key()
if err != nil {
t.Fatal(err)
}
segments := []string{aKey.String(), "child", "grandchild"}
p, err := path.FromSegments("/ipfs/", segments...)
if err != nil {
t.Fatal(err)
}
resolver := &path.Resolver{DAG: dagService}
node, err := resolver.ResolvePath(ctx, p)
if err != nil {
t.Fatal(err)
}
key, err := node.Key()
if err != nil {
t.Fatal(err)
}
if key.String() != cKey.String() {
t.Fatal(fmt.Errorf(
"recursive path resolution failed for %s: %s != %s",
p.String(), key.String(), cKey.String()))
}
}
func TestRecurivePathResolution(t *testing.T) {
ctx := context.Background()
dagService := dagmock.Mock()
a, _ := randNode()
b, _ := randNode()
c, cKey := randNode()
err := b.AddNodeLink("grandchild", c)
if err != nil {
t.Fatal(err)
}
err = a.AddNodeLink("child", b)
if err != nil {
t.Fatal(err)
}
for _, n := range []*merkledag.Node{a, b, c} {
_, err = dagService.Add(n)
if err != nil {
t.Fatal(err)
}
}
aKey, err := a.Key()
if err != nil {
t.Fatal(err)
}
segments := []string{aKey.String(), "child", "grandchild"}
p, err := path.FromSegments("/ipfs/", segments...)
if err != nil {
t.Fatal(err)
}
resolver := &path.Resolver{DAG: dagService}
node, err := resolver.ResolvePath(ctx, p)
if err != nil {
t.Fatal(err)
}
key, err := node.Key()
if err != nil {
t.Fatal(err)
}
if key.String() != cKey.String() {
t.Fatal(fmt.Errorf(
"recursive path resolution failed for %s: %s != %s",
p.String(), key.String(), cKey.String()))
}
}
// 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)
}
// 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
}
}
// resolveOnce implements resolver.
func (ns *mpns) resolveOnce(ctx context.Context, name string) (path.Path, error) {
if !strings.HasPrefix(name, "/ipns/") {
name = "/ipns/" + name
}
segments := strings.SplitN(name, "/", 4)
if len(segments) < 3 || segments[0] != "" {
log.Warningf("Invalid name syntax for %s", name)
return "", ErrResolveFailed
}
for protocol, resolver := range ns.resolvers {
log.Debugf("Attempting to resolve %s with %s", segments[2], protocol)
p, err := resolver.resolveOnce(ctx, segments[2])
if err == nil {
if len(segments) > 3 {
return path.FromSegments("", strings.TrimRight(p.String(), "/"), segments[3])
} else {
return p, err
}
}
}
log.Warningf("No resolver found for %s", name)
return "", ErrResolveFailed
}