mirror of
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108 lines
3.2 KiB
Go
108 lines
3.2 KiB
Go
package namesys
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import (
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"fmt"
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proto "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/gogo/protobuf/proto"
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mh "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-multihash"
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"github.com/ipfs/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
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key "github.com/ipfs/go-ipfs/blocks/key"
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pb "github.com/ipfs/go-ipfs/namesys/pb"
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path "github.com/ipfs/go-ipfs/path"
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routing "github.com/ipfs/go-ipfs/routing"
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logging "github.com/ipfs/go-ipfs/vendor/QmXJkcEXB6C9h6Ytb6rrUTFU56Ro62zxgrbxTT3dgjQGA8/go-log"
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)
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var log = logging.Logger("namesys")
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// routingResolver implements NSResolver for the main IPFS SFS-like naming
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type routingResolver struct {
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routing routing.IpfsRouting
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}
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// NewRoutingResolver constructs a name resolver using the IPFS Routing system
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// to implement SFS-like naming on top.
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func NewRoutingResolver(route routing.IpfsRouting) Resolver {
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if route == nil {
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panic("attempt to create resolver with nil routing system")
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}
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return &routingResolver{routing: route}
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}
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// newRoutingResolver returns a resolver instead of a Resolver.
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func newRoutingResolver(route routing.IpfsRouting) resolver {
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if route == nil {
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panic("attempt to create resolver with nil routing system")
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}
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return &routingResolver{routing: route}
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}
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// Resolve implements Resolver.
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func (r *routingResolver) Resolve(ctx context.Context, name string) (path.Path, error) {
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return r.ResolveN(ctx, name, DefaultDepthLimit)
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}
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// ResolveN implements Resolver.
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func (r *routingResolver) ResolveN(ctx context.Context, name string, depth int) (path.Path, error) {
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return resolve(ctx, r, name, depth, "/ipns/")
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}
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// resolveOnce implements resolver. Uses the IPFS routing system to
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// resolve SFS-like names.
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func (r *routingResolver) resolveOnce(ctx context.Context, name string) (path.Path, error) {
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log.Debugf("RoutingResolve: '%s'", name)
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hash, err := mh.FromB58String(name)
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if err != nil {
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log.Warning("RoutingResolve: bad input hash: [%s]\n", name)
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return "", err
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}
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// name should be a multihash. if it isn't, error out here.
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// use the routing system to get the name.
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// /ipns/<name>
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h := []byte("/ipns/" + string(hash))
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ipnsKey := key.Key(h)
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val, err := r.routing.GetValue(ctx, ipnsKey)
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if err != nil {
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log.Warning("RoutingResolve get failed.")
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return "", err
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}
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entry := new(pb.IpnsEntry)
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err = proto.Unmarshal(val, entry)
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if err != nil {
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return "", err
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}
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// name should be a public key retrievable from ipfs
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pubkey, err := routing.GetPublicKey(r.routing, ctx, hash)
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if err != nil {
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return "", err
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}
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hsh, _ := pubkey.Hash()
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log.Debugf("pk hash = %s", key.Key(hsh))
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// check sig with pk
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if ok, err := pubkey.Verify(ipnsEntryDataForSig(entry), entry.GetSignature()); err != nil || !ok {
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return "", fmt.Errorf("Invalid value. Not signed by PrivateKey corresponding to %v", pubkey)
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}
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// ok sig checks out. this is a valid name.
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// check for old style record:
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valh, err := mh.Cast(entry.GetValue())
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if err != nil {
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// Not a multihash, probably a new record
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return path.ParsePath(string(entry.GetValue()))
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} else {
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// Its an old style multihash record
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log.Warning("Detected old style multihash record")
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return path.FromKey(key.Key(valh)), nil
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}
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}
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