Add vendor folder to git

vendor/github.com/docker/distribution/registry/proxy/proxyauth.go

@@ -0,0 +1,58 @@
+package proxy
+
+import (
+	"net/http"
+	"net/url"
+
+	"github.com/docker/distribution/registry/client/auth"
+)
+
+const tokenURL = "https://auth.docker.io/token"
+const challengeHeader = "Docker-Distribution-Api-Version"
+
+type userpass struct {
+	username string
+	password string
+}
+
+type credentials struct {
+	creds map[string]userpass
+}
+
+func (c credentials) Basic(u *url.URL) (string, string) {
+	up := c.creds[u.String()]
+
+	return up.username, up.password
+}
+
+func (c credentials) RefreshToken(u *url.URL, service string) string {
+	return ""
+}
+
+func (c credentials) SetRefreshToken(u *url.URL, service, token string) {
+}
+
+// configureAuth stores credentials for challenge responses
+func configureAuth(username, password string) (auth.CredentialStore, error) {
+	creds := map[string]userpass{
+		tokenURL: {
+			username: username,
+			password: password,
+		},
+	}
+	return credentials{creds: creds}, nil
+}
+
+func ping(manager auth.ChallengeManager, endpoint, versionHeader string) error {
+	resp, err := http.Get(endpoint)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if err := manager.AddResponse(resp); err != nil {
+		return err
+	}
+
+	return nil
+}