mirror of
https://github.com/ipfs/kubo.git
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58 lines
1.6 KiB
Go
58 lines
1.6 KiB
Go
package core
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import (
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"errors"
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"fmt"
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"strings"
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merkledag "github.com/ipfs/go-ipfs/merkledag"
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path "github.com/ipfs/go-ipfs/path"
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)
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const maxLinks = 32
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var ErrTooManyLinks = errors.New("exceeded maximum number of links in ipns entry")
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// Resolves the given path by parsing out /ipns/ entries and then going
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// through the /ipfs/ entries and returning the final merkledage node.
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// Effectively enables /ipns/ in CLI commands.
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func Resolve(n *IpfsNode, p path.Path) (*merkledag.Node, error) {
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return resolveRecurse(n, p, 0)
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}
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func resolveRecurse(n *IpfsNode, p path.Path, depth int) (*merkledag.Node, error) {
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if depth >= maxLinks {
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return nil, ErrTooManyLinks
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}
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// for now, we only try to resolve ipns paths if
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// they begin with "/ipns/". Otherwise, ambiguity
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// emerges when resolving just a <hash>. Is it meant
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// to be an ipfs or an ipns resolution?
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if strings.HasPrefix(p.String(), "/ipns/") {
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// if it's an ipns path, try to resolve it.
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// if we can't, we can give that error back to the user.
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seg := p.Segments()
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if len(seg) < 2 || seg[1] == "" { // just "/ipns/"
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return nil, fmt.Errorf("invalid path: %s", string(p))
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}
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ipnsPath := seg[1]
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extensions := seg[2:]
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respath, err := n.Namesys.Resolve(n.Context(), ipnsPath)
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if err != nil {
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return nil, err
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}
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segments := append(respath.Segments(), extensions...)
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respath, err = path.FromSegments(segments...)
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if err != nil {
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return nil, err
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}
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return resolveRecurse(n, respath, depth+1)
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}
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// ok, we have an ipfs path now (or what we'll treat as one)
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return n.Resolver.ResolvePath(p)
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}
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