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f640ba0089
commands/object: remove objectData() and objectLinks() helpers resolver: added context parameters sharness: $HASH carried the \r from the http protocol with sharness: write curl output to individual files http gw: break PUT handler until PR#1191
75 lines
2.0 KiB
Go
75 lines
2.0 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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context "github.com/ipfs/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
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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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// errors returned by Resolve function
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var (
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ErrTooManyLinks = errors.New("core/resolve: exceeded maximum number of links in ipns entry")
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ErrNoNamesys = errors.New("core/resolve: no Namesys on IpfsNode - can't resolve ipns entry")
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)
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// Resolve 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(ctx context.Context, n *IpfsNode, p path.Path) (*merkledag.Node, error) {
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r := resolver{ctx, n, p}
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return r.resolveRecurse(0)
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}
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type resolver struct {
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ctx context.Context
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n *IpfsNode
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p path.Path
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}
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func (r *resolver) resolveRecurse(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(r.p.String(), "/ipns/") {
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// TODO(cryptix): we sould be able to query the local cache for the path
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if r.n.Namesys == nil {
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return nil, ErrNoNamesys
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}
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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 := r.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(r.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 := r.n.Namesys.Resolve(r.ctx, 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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r.p, 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 r.resolveRecurse(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 r.n.Resolver.ResolvePath(r.ctx, r.p)
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}
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