Vendor bump for licensing library to support multiple signing keys

Signed-off-by: Daniel Hiltgen <daniel.hiltgen@docker.com>

vendor.conf

@@ -22,7 +22,7 @@ github.com/docker/go-events 9461782956ad83b30282bf90e31fa6a70c255ba9
 github.com/docker/go-metrics d466d4f6fd960e01820085bd7e1a24426ee7ef18
 github.com/docker/go-units 47565b4f722fb6ceae66b95f853feed578a4a51c # v0.3.3
 github.com/docker/libtrust 9cbd2a1374f46905c68a4eb3694a130610adc62a
-github.com/docker/licensing 369e530
+github.com/docker/licensing 5c4c7b4
 github.com/docker/swarmkit cfa742c8abe6f8e922f6e4e920153c408e7d9c3b
 github.com/flynn-archive/go-shlex 3f9db97f856818214da2e1057f8ad84803971cff
 github.com/ghodss/yaml 0ca9ea5df5451ffdf184b4428c902747c2c11cd7 # v1.0.0

vendor/github.com/docker/licensing/LICENSE

@@ -0,0 +1,191 @@
+
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+
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vendor/github.com/docker/licensing/README.md

@@ -1,5 +1,12 @@
-# Licensing
+docker/licensing
----
+=========
+
 ## Overview
 
 *licensing* is a library for interacting with Docker issued product licenses. It facilitates user's authentication to the [Docker Store](https://store.docker.com), provides a mechanism for retrieving a user's existing licenses, detects and verifies locally stored licenses, and can be used to provision trial licenses for [Docker Enterprise Edition](https://www.docker.com/enterprise-edition).
+
+License
+=========
+docker/licensing is licensed under the Apache License, Version 2.0. See
+[LICENSE](https://github.com/docker/licensing/blob/master/LICENSE) for the full
+license text.

vendor/github.com/docker/licensing/client.go

@@ -193,7 +193,7 @@ func (c *client) ParseLicense(license []byte) (*model.IssuedLicense, error) {
 }
 
 type client struct {
-	publicKey libtrust.PublicKey
+	publicKeys []libtrust.PublicKey
 	hclient    *http.Client
 	baseURI    url.URL
 }
@@ -203,7 +203,7 @@ type Config struct {
 	BaseURI    url.URL
 	HTTPClient *http.Client
 	// used by licensing client to validate an issued license
-	PublicKey string
+	PublicKeys []string
 }
 
 func errorSummary(body []byte) string {
@@ -221,7 +221,7 @@ func errorSummary(body []byte) string {
 
 // New creates a new licensing Client
 func New(config *Config) (Client, error) {
-	publicKey, err := unmarshalPublicKey(config.PublicKey)
+	publicKeys, err := unmarshalPublicKeys(config.PublicKeys)
 	if err != nil {
 		return nil, err
 	}
@@ -234,10 +234,24 @@ func New(config *Config) (Client, error) {
 	return &client{
 		baseURI:    config.BaseURI,
 		hclient:    hclient,
-		publicKey: publicKey,
+		publicKeys: publicKeys,
 	}, nil
 }
 
+func unmarshalPublicKeys(publicKeys []string) ([]libtrust.PublicKey, error) {
+	trustKeys := make([]libtrust.PublicKey, len(publicKeys))
+
+	for i, publicKey := range publicKeys {
+		trustKey, err := unmarshalPublicKey(publicKey)
+		if err != nil {
+			return nil, err
+		}
+
+		trustKeys[i] = trustKey
+	}
+	return trustKeys, nil
+}
+
 func unmarshalPublicKey(publicKey string) (libtrust.PublicKey, error) {
 	pemBytes, err := base64.StdEncoding.DecodeString(publicKey)
 	if err != nil {

vendor/github.com/docker/licensing/license.go

@@ -63,7 +63,7 @@ func (c *client) check(ctx context.Context, license model.IssuedLicense) (*model
 
 	key := keys[0]
 
-	if key.KeyID() != c.publicKey.KeyID() {
+	if !c.recognizedSigningKey(key) {
 		return nil, errors.New("unrecognized signing key")
 	}
 
@@ -93,6 +93,16 @@ func (c *client) check(ctx context.Context, license model.IssuedLicense) (*model
 	return checkRes, nil
 }
 
+// recognizedSigningKey returns true if the given key is signed with a recognized signing key, false otherwise
+func (c *client) recognizedSigningKey(key libtrust.PublicKey) bool {
+	for _, publicKey := range c.publicKeys {
+		if key.KeyID() == publicKey.KeyID() {
+			return true
+		}
+	}
+	return false
+}
+
 // getAuthorization returns the decoded license authorization
 func (c *client) getAuthorization(ctx context.Context, license model.IssuedLicense) ([]byte, error) {
 	decoded, err := base64.StdEncoding.DecodeString(license.Authorization)