Remove exported StringSet type and collections package

The exported StringSet type is not necessary for the current use case of
validating issues and audiences. The exported fields on VerifyOptions have been
changed to require string slices. The collections package has been removed and
the StringSet has been moved to the token package, where it is used.

Signed-off-by: Stephen J Day <stephen.day@docker.com>

auth/token/accesscontroller.go

@@ -14,7 +14,6 @@ import (
 	"github.com/docker/libtrust"
 
 	"github.com/docker/distribution/auth"
-	"github.com/docker/distribution/collections"
 )
 
 // accessSet maps a typed, named resource to
@@ -38,7 +37,7 @@ func newAccessSet(accessItems ...auth.Access) accessSet {
 			accessSet[resource] = set
 		}
 
-		set.Add(access.Action)
+		set.add(access.Action)
 	}
 
 	return accessSet
@@ -48,7 +47,7 @@ func newAccessSet(accessItems ...auth.Access) accessSet {
 func (s accessSet) contains(access auth.Access) bool {
 	actionSet, ok := s[access.Resource]
 	if ok {
-		return actionSet.Contains(access.Action)
+		return actionSet.contains(access.Action)
 	}
 
 	return false
@@ -61,7 +60,7 @@ func (s accessSet) scopeParam() string {
 	scopes := make([]string, 0, len(s))
 
 	for resource, actionSet := range s {
-		actions := strings.Join(actionSet.Keys(), ",")
+		actions := strings.Join(actionSet.keys(), ",")
 		scopes = append(scopes, fmt.Sprintf("%s:%s:%s", resource.Type, resource.Name, actions))
 	}
 
@@ -241,8 +240,8 @@ func (ac *accessController) Authorized(req *http.Request, accessItems ...auth.Ac
 	}
 
 	verifyOpts := VerifyOptions{
-		TrustedIssuers:    collections.NewStringSet(ac.issuer),
+		TrustedIssuers:    []string{ac.issuer},
-		AcceptedAudiences: collections.NewStringSet(ac.service),
+		AcceptedAudiences: []string{ac.service},
 		Roots:             ac.rootCerts,
 		TrustedKeys:       ac.trustedKeys,
 	}

auth/token/stringset.go

@@ -1,30 +1,30 @@
-package collections
+package token
 
 // StringSet is a useful type for looking up strings.
-type StringSet map[string]struct{}
+type stringSet map[string]struct{}
 
 // NewStringSet creates a new StringSet with the given strings.
-func NewStringSet(keys ...string) StringSet {
+func newStringSet(keys ...string) stringSet {
-	ss := make(StringSet, len(keys))
+	ss := make(stringSet, len(keys))
-	ss.Add(keys...)
+	ss.add(keys...)
 	return ss
 }
 
 // Add inserts the given keys into this StringSet.
-func (ss StringSet) Add(keys ...string) {
+func (ss stringSet) add(keys ...string) {
 	for _, key := range keys {
 		ss[key] = struct{}{}
 	}
 }
 
 // Contains returns whether the given key is in this StringSet.
-func (ss StringSet) Contains(key string) bool {
+func (ss stringSet) contains(key string) bool {
 	_, ok := ss[key]
 	return ok
 }
 
 // Keys returns a slice of all keys in this StringSet.
-func (ss StringSet) Keys() []string {
+func (ss stringSet) keys() []string {
 	keys := make([]string, 0, len(ss))
 
 	for key := range ss {

auth/token/token.go

@@ -14,7 +14,6 @@ import (
 	"github.com/docker/libtrust"
 
 	"github.com/docker/distribution/auth"
-	"github.com/docker/distribution/collections"
 )
 
 const (
@@ -71,8 +70,8 @@ type Token struct {
 // VerifyOptions is used to specify
 // options when verifying a JSON Web Token.
 type VerifyOptions struct {
-	TrustedIssuers    collections.StringSet
+	TrustedIssuers    []string
-	AcceptedAudiences collections.StringSet
+	AcceptedAudiences []string
 	Roots             *x509.CertPool
 	TrustedKeys       map[string]libtrust.PublicKey
 }
@@ -132,13 +131,13 @@ func NewToken(rawToken string) (*Token, error) {
 // Returns a nil error if the token is valid.
 func (t *Token) Verify(verifyOpts VerifyOptions) error {
 	// Verify that the Issuer claim is a trusted authority.
-	if !verifyOpts.TrustedIssuers.Contains(t.Claims.Issuer) {
+	if !contains(verifyOpts.TrustedIssuers, t.Claims.Issuer) {
 		log.Errorf("token from untrusted issuer: %q", t.Claims.Issuer)
 		return ErrInvalidToken
 	}
 
 	// Verify that the Audience claim is allowed.
-	if !verifyOpts.AcceptedAudiences.Contains(t.Claims.Audience) {
+	if !contains(verifyOpts.AcceptedAudiences, t.Claims.Audience) {
 		log.Errorf("token intended for another audience: %q", t.Claims.Audience)
 		return ErrInvalidToken
 	}
@@ -332,7 +331,7 @@ func (t *Token) accessSet() accessSet {
 		}
 
 		for _, action := range resourceActions.Actions {
-			set.Add(action)
+			set.add(action)
 		}
 	}
 

auth/token/token_test.go

@@ -15,10 +15,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/docker/libtrust"
-
 	"github.com/docker/distribution/auth"
-	"github.com/docker/distribution/collections"
+	"github.com/docker/libtrust"
 )
 
 func makeRootKeys(numKeys int) ([]libtrust.PrivateKey, error) {
@@ -196,8 +194,8 @@ func TestTokenVerify(t *testing.T) {
 	}
 
 	verifyOps := VerifyOptions{
-		TrustedIssuers:    collections.NewStringSet(issuer),
+		TrustedIssuers:    []string{issuer},
-		AcceptedAudiences: collections.NewStringSet(audience),
+		AcceptedAudiences: []string{audience},
 		Roots:             rootPool,
 		TrustedKeys:       trustedKeys,
 	}

auth/token/util.go

@@ -4,8 +4,6 @@ import (
 	"encoding/base64"
 	"errors"
 	"strings"
-
-	"github.com/docker/distribution/collections"
 )
 
 // joseBase64UrlEncode encodes the given data using the standard base64 url
@@ -35,15 +33,26 @@ func joseBase64UrlDecode(s string) ([]byte, error) {
 
 // actionSet is a special type of stringSet.
 type actionSet struct {
-	collections.StringSet
+	stringSet
 }
 
 func newActionSet(actions ...string) actionSet {
-	return actionSet{collections.NewStringSet(actions...)}
+	return actionSet{newStringSet(actions...)}
 }
 
 // Contains calls StringSet.Contains() for
 // either "*" or the given action string.
-func (s actionSet) Contains(action string) bool {
+func (s actionSet) contains(action string) bool {
-	return s.StringSet.Contains("*") || s.StringSet.Contains(action)
+	return s.stringSet.contains("*") || s.stringSet.contains(action)
+}
+
+// contains returns true if q is found in ss.
+func contains(ss []string, q string) bool {
+	for _, s := range ss {
+		if s == q {
+			return true
+		}
+	}
+
+	return false
 }