mirror of
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101 lines
3.1 KiB
Go
101 lines
3.1 KiB
Go
package core
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import (
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"context"
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"errors"
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"strings"
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namesys "github.com/ipfs/go-ipfs/namesys"
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path "github.com/ipfs/go-ipfs/path"
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node "gx/ipfs/QmNwUEK7QbwSqyKBu3mMtToo8SUc6wQJ7gdZq4gGGJqfnf/go-ipld-format"
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logging "gx/ipfs/QmSpJByNKFX1sCsHBEp3R73FL4NF6FnQTEGyNAXHm2GS52/go-log"
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cid "gx/ipfs/QmeSrf6pzut73u6zLQkRFQ3ygt3k6XFT2kjdYP8Tnkwwyg/go-cid"
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)
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// ErrNoNamesys is an explicit error for when an IPFS node doesn't
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// (yet) have a name system
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var ErrNoNamesys = errors.New(
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"core/resolve: no Namesys on IpfsNode - can't resolve ipns entry")
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// Resolve resolves the given path by parsing out protocol-specific
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// entries (e.g. /ipns/<node-key>) and then going through the /ipfs/
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// entries and returning the final node.
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func Resolve(ctx context.Context, nsys namesys.NameSystem, r *path.Resolver, p path.Path) (node.Node, error) {
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if strings.HasPrefix(p.String(), "/ipns/") {
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evt := log.EventBegin(ctx, "resolveIpnsPath")
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defer evt.Done()
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// resolve ipns paths
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// TODO(cryptix): we sould be able to query the local cache for the path
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if nsys == nil {
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evt.Append(logging.LoggableMap{"error": ErrNoNamesys.Error()})
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return nil, ErrNoNamesys
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}
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seg := p.Segments()
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if len(seg) < 2 || seg[1] == "" { // just "/<protocol/>" without further segments
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evt.Append(logging.LoggableMap{"error": path.ErrNoComponents.Error()})
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return nil, path.ErrNoComponents
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}
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extensions := seg[2:]
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resolvable, err := path.FromSegments("/", seg[0], seg[1])
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if err != nil {
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evt.Append(logging.LoggableMap{"error": err.Error()})
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return nil, err
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}
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respath, err := nsys.Resolve(ctx, resolvable.String())
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if err != nil {
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evt.Append(logging.LoggableMap{"error": err.Error()})
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return nil, err
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}
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segments := append(respath.Segments(), extensions...)
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p, err = path.FromSegments("/", segments...)
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if err != nil {
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evt.Append(logging.LoggableMap{"error": err.Error()})
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return nil, err
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}
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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.ResolvePath(ctx, p)
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}
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// ResolveToCid resolves a path to a cid.
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//
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// It first checks if the path is already in the form of just a cid (<cid> or
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// /ipfs/<cid>) and returns immediately if so. Otherwise, it falls back onto
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// Resolve to perform resolution of the dagnode being referenced.
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func ResolveToCid(ctx context.Context, nsys namesys.NameSystem, r *path.Resolver, p path.Path) (*cid.Cid, error) {
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// If the path is simply a cid, parse and return it. Parsed paths are already
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// normalized (read: prepended with /ipfs/ if needed), so segment[1] should
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// always be the key.
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if p.IsJustAKey() {
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return cid.Decode(p.Segments()[1])
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}
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// Fall back onto regular dagnode resolution. Retrieve the second-to-last
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// segment of the path and resolve its link to the last segment.
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head, tail, err := p.PopLastSegment()
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if err != nil {
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return nil, err
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}
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dagnode, err := Resolve(ctx, nsys, r, head)
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if err != nil {
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return nil, err
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}
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// Extract and return the cid of the link to the target dag node.
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link, _, err := dagnode.ResolveLink([]string{tail})
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if err != nil {
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return nil, err
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}
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return link.Cid, nil
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}
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