1 files changed, 0 insertions, 141 deletions
diff --git a/middleware/federation/federation.go b/middleware/federation/federation.go
deleted file mode 100644
index bc74d9fc9..000000000
--- a/middleware/federation/federation.go
+++ /dev/null
@@ -1,141 +0,0 @@
-/*
-Package federation implements kubernetes federation. It checks if the qname matches
-a possible federation. If this is the case and the captured answer is an NXDOMAIN,
-federation is performed. If this is not the case the original answer is returned.
-
-The federation label is always the 2nd to last once the zone is chopped of. For
-instance "nginx.mynamespace.myfederation.svc.example.com" has "myfederation" as
-the federation label. For federation to work we do a normal k8s lookup
-*without* that label, if that comes back with NXDOMAIN or NODATA(??) we create
-a federation record and return that.
-
-Federation is only useful in conjunction with the kubernetes middleware, without it is a noop.
-*/
-package federation
-
-import (
-	"github.com/coredns/coredns/middleware"
-	"github.com/coredns/coredns/middleware/etcd/msg"
-	"github.com/coredns/coredns/middleware/pkg/dnsutil"
-	"github.com/coredns/coredns/middleware/pkg/nonwriter"
-	"github.com/coredns/coredns/request"
-
-	"github.com/miekg/dns"
-	"golang.org/x/net/context"
-)
-
-// Federation contains the name to zone mapping used for federation in kubernetes.
-type Federation struct {
-	f     map[string]string
-	zones []string
-
-	Next        middleware.Handler
-	Federations Func
-}
-
-// Func needs to be implemented by any middleware that implements
-// federation. Right now this is only the kubernetes middleware.
-type Func func(state request.Request, fname, fzone string) (msg.Service, error)
-
-// New returns a new federation.
-func New() *Federation {
-	return &Federation{f: make(map[string]string)}
-}
-
-// ServeDNS implements the middleware.Handle interface.
-func (f *Federation) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
-	if f.Federations == nil {
-		return middleware.NextOrFailure(f.Name(), f.Next, ctx, w, r)
-	}
-
-	state := request.Request{W: w, Req: r}
-	zone := middleware.Zones(f.zones).Matches(state.Name())
-	if zone == "" {
-		return middleware.NextOrFailure(f.Name(), f.Next, ctx, w, r)
-	}
-
-	state.Zone = zone
-
-	// Remove the federation label from the qname to see if something exists.
-	without, label := f.isNameFederation(state.Name(), state.Zone)
-	if without == "" {
-		return middleware.NextOrFailure(f.Name(), f.Next, ctx, w, r)
-	}
-
-	qname := r.Question[0].Name
-	r.Question[0].Name = without
-	state.Clear()
-
-	// Start the next middleware, but with a nowriter, capture the result, if NXDOMAIN
-	// perform federation, otherwise just write the result.
-	nw := nonwriter.New(w)
-	ret, err := middleware.NextOrFailure(f.Name(), f.Next, ctx, nw, r)
-
-	if !middleware.ClientWrite(ret) {
-		// something went wrong
-		r.Question[0].Name = qname
-		return ret, err
-	}
-
-	if m := nw.Msg; m.Rcode != dns.RcodeNameError {
-		// If positive answer we need to substitute the original qname in the answer.
-		m.Question[0].Name = qname
-		for _, a := range m.Answer {
-			a.Header().Name = qname
-		}
-
-		state.SizeAndDo(m)
-		m, _ = state.Scrub(m)
-		w.WriteMsg(m)
-
-		return dns.RcodeSuccess, nil
-	}
-
-	// Still here, we've seen NXDOMAIN and need to perform federation.
-	service, err := f.Federations(state, label, f.f[label]) // state references Req which has updated qname
-	if err != nil {
-		r.Question[0].Name = qname
-		return dns.RcodeServerFailure, err
-	}
-
-	r.Question[0].Name = qname
-
-	m := new(dns.Msg)
-	m.SetReply(r)
-	m.Authoritative, m.RecursionAvailable, m.Compress = true, true, true
-
-	m.Answer = []dns.RR{service.NewCNAME(state.QName(), service.Host)}
-
-	state.SizeAndDo(m)
-	m, _ = state.Scrub(m)
-	w.WriteMsg(m)
-
-	return dns.RcodeSuccess, nil
-}
-
-// Name implements the middleware.Handle interface.
-func (f *Federation) Name() string { return "federation" }
-
-// IsNameFederation checks the qname to see if it is a potential federation. The federation
-// label is always the 2nd to last once the zone is chopped of. For instance
-// "nginx.mynamespace.myfederation.svc.example.com" has "myfederation" as the federation label.
-// IsNameFederation returns a new qname with the federation label and the label itself or two
-// empty strings if there wasn't a hit.
-func (f *Federation) isNameFederation(name, zone string) (string, string) {
-	base, _ := dnsutil.TrimZone(name, zone)
-
-	// TODO(miek): dns.PrevLabel is better for memory, or dns.Split.
-	labels := dns.SplitDomainName(base)
-	ll := len(labels)
-	if ll < 2 {
-		return "", ""
-	}
-
-	fed := labels[ll-2]
-
-	if _, ok := f.f[fed]; ok {
-		without := dnsutil.Join(labels[:ll-2]) + labels[ll-1] + "." + zone
-		return without, fed
-	}
-	return "", ""
-}