switch to go.mod

8 files changed, 0 insertions, 2114 deletions

diff --git a/vendor/golang.org/x/crypto/acme/autocert/autocert.go b/vendor/golang.org/x/crypto/acme/autocert/autocert.go
deleted file mode 100644
index a478eff..0000000
--- a/vendor/golang.org/x/crypto/acme/autocert/autocert.go
+++ /dev/null
@@ -1,819 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package autocert provides automatic access to certificates from Let's Encrypt
-// and any other ACME-based CA.
-//
-// This package is a work in progress and makes no API stability promises.
-package autocert
-
-import (
-	"bytes"
-	"context"
-	"crypto"
-	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
-	"crypto/rsa"
-	"crypto/tls"
-	"crypto/x509"
-	"crypto/x509/pkix"
-	"encoding/pem"
-	"errors"
-	"fmt"
-	"io"
-	mathrand "math/rand"
-	"net/http"
-	"strconv"
-	"strings"
-	"sync"
-	"time"
-
-	"golang.org/x/crypto/acme"
-)
-
-// createCertRetryAfter is how much time to wait before removing a failed state
-// entry due to an unsuccessful createCert call.
-// This is a variable instead of a const for testing.
-// TODO: Consider making it configurable or an exp backoff?
-var createCertRetryAfter = time.Minute
-
-// pseudoRand is safe for concurrent use.
-var pseudoRand *lockedMathRand
-
-func init() {
-	src := mathrand.NewSource(timeNow().UnixNano())
-	pseudoRand = &lockedMathRand{rnd: mathrand.New(src)}
-}
-
-// AcceptTOS is a Manager.Prompt function that always returns true to
-// indicate acceptance of the CA's Terms of Service during account
-// registration.
-func AcceptTOS(tosURL string) bool { return true }
-
-// HostPolicy specifies which host names the Manager is allowed to respond to.
-// It returns a non-nil error if the host should be rejected.
-// The returned error is accessible via tls.Conn.Handshake and its callers.
-// See Manager's HostPolicy field and GetCertificate method docs for more details.
-type HostPolicy func(ctx context.Context, host string) error
-
-// HostWhitelist returns a policy where only the specified host names are allowed.
-// Only exact matches are currently supported. Subdomains, regexp or wildcard
-// will not match.
-func HostWhitelist(hosts ...string) HostPolicy {
-	whitelist := make(map[string]bool, len(hosts))
-	for _, h := range hosts {
-		whitelist[h] = true
-	}
-	return func(_ context.Context, host string) error {
-		if !whitelist[host] {
-			return errors.New("acme/autocert: host not configured")
-		}
-		return nil
-	}
-}
-
-// defaultHostPolicy is used when Manager.HostPolicy is not set.
-func defaultHostPolicy(context.Context, string) error {
-	return nil
-}
-
-// Manager is a stateful certificate manager built on top of acme.Client.
-// It obtains and refreshes certificates automatically,
-// as well as providing them to a TLS server via tls.Config.
-//
-// To preserve issued certificates and improve overall performance,
-// use a cache implementation of Cache. For instance, DirCache.
-type Manager struct {
-	// Prompt specifies a callback function to conditionally accept a CA's Terms of Service (TOS).
-	// The registration may require the caller to agree to the CA's TOS.
-	// If so, Manager calls Prompt with a TOS URL provided by the CA. Prompt should report
-	// whether the caller agrees to the terms.
-	//
-	// To always accept the terms, the callers can use AcceptTOS.
-	Prompt func(tosURL string) bool
-
-	// Cache optionally stores and retrieves previously-obtained certificates.
-	// If nil, certs will only be cached for the lifetime of the Manager.
-	//
-	// Manager passes the Cache certificates data encoded in PEM, with private/public
-	// parts combined in a single Cache.Put call, private key first.
-	Cache Cache
-
-	// HostPolicy controls which domains the Manager will attempt
-	// to retrieve new certificates for. It does not affect cached certs.
-	//
-	// If non-nil, HostPolicy is called before requesting a new cert.
-	// If nil, all hosts are currently allowed. This is not recommended,
-	// as it opens a potential attack where clients connect to a server
-	// by IP address and pretend to be asking for an incorrect host name.
-	// Manager will attempt to obtain a certificate for that host, incorrectly,
-	// eventually reaching the CA's rate limit for certificate requests
-	// and making it impossible to obtain actual certificates.
-	//
-	// See GetCertificate for more details.
-	HostPolicy HostPolicy
-
-	// RenewBefore optionally specifies how early certificates should
-	// be renewed before they expire.
-	//
-	// If zero, they're renewed 30 days before expiration.
-	RenewBefore time.Duration
-
-	// Client is used to perform low-level operations, such as account registration
-	// and requesting new certificates.
-	// If Client is nil, a zero-value acme.Client is used with acme.LetsEncryptURL
-	// directory endpoint and a newly-generated ECDSA P-256 key.
-	//
-	// Mutating the field after the first call of GetCertificate method will have no effect.
-	Client *acme.Client
-
-	// Email optionally specifies a contact email address.
-	// This is used by CAs, such as Let's Encrypt, to notify about problems
-	// with issued certificates.
-	//
-	// If the Client's account key is already registered, Email is not used.
-	Email string
-
-	// ForceRSA makes the Manager generate certificates with 2048-bit RSA keys.
-	//
-	// If false, a default is used. Currently the default
-	// is EC-based keys using the P-256 curve.
-	ForceRSA bool
-
-	clientMu sync.Mutex
-	client   *acme.Client // initialized by acmeClient method
-
-	stateMu sync.Mutex
-	state   map[string]*certState // keyed by domain name
-
-	// tokenCert is keyed by token domain name, which matches server name
-	// of ClientHello. Keys always have ".acme.invalid" suffix.
-	tokenCertMu sync.RWMutex
-	tokenCert   map[string]*tls.Certificate
-
-	// renewal tracks the set of domains currently running renewal timers.
-	// It is keyed by domain name.
-	renewalMu sync.Mutex
-	renewal   map[string]*domainRenewal
-}
-
-// GetCertificate implements the tls.Config.GetCertificate hook.
-// It provides a TLS certificate for hello.ServerName host, including answering
-// *.acme.invalid (TLS-SNI) challenges. All other fields of hello are ignored.
-//
-// If m.HostPolicy is non-nil, GetCertificate calls the policy before requesting
-// a new cert. A non-nil error returned from m.HostPolicy halts TLS negotiation.
-// The error is propagated back to the caller of GetCertificate and is user-visible.
-// This does not affect cached certs. See HostPolicy field description for more details.
-func (m *Manager) GetCertificate(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
-	if m.Prompt == nil {
-		return nil, errors.New("acme/autocert: Manager.Prompt not set")
-	}
-
-	name := hello.ServerName
-	if name == "" {
-		return nil, errors.New("acme/autocert: missing server name")
-	}
-	if !strings.Contains(strings.Trim(name, "."), ".") {
-		return nil, errors.New("acme/autocert: server name component count invalid")
-	}
-	if strings.ContainsAny(name, `/\`) {
-		return nil, errors.New("acme/autocert: server name contains invalid character")
-	}
-
-	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
-	defer cancel()
-
-	// check whether this is a token cert requested for TLS-SNI challenge
-	if strings.HasSuffix(name, ".acme.invalid") {
-		m.tokenCertMu.RLock()
-		defer m.tokenCertMu.RUnlock()
-		if cert := m.tokenCert[name]; cert != nil {
-			return cert, nil
-		}
-		if cert, err := m.cacheGet(ctx, name); err == nil {
-			return cert, nil
-		}
-		// TODO: cache error results?
-		return nil, fmt.Errorf("acme/autocert: no token cert for %q", name)
-	}
-
-	// regular domain
-	name = strings.TrimSuffix(name, ".") // golang.org/issue/18114
-	cert, err := m.cert(ctx, name)
-	if err == nil {
-		return cert, nil
-	}
-	if err != ErrCacheMiss {
-		return nil, err
-	}
-
-	// first-time
-	if err := m.hostPolicy()(ctx, name); err != nil {
-		return nil, err
-	}
-	cert, err = m.createCert(ctx, name)
-	if err != nil {
-		return nil, err
-	}
-	m.cachePut(ctx, name, cert)
-	return cert, nil
-}
-
-// cert returns an existing certificate either from m.state or cache.
-// If a certificate is found in cache but not in m.state, the latter will be filled
-// with the cached value.
-func (m *Manager) cert(ctx context.Context, name string) (*tls.Certificate, error) {
-	m.stateMu.Lock()
-	if s, ok := m.state[name]; ok {
-		m.stateMu.Unlock()
-		s.RLock()
-		defer s.RUnlock()
-		return s.tlscert()
-	}
-	defer m.stateMu.Unlock()
-	cert, err := m.cacheGet(ctx, name)
-	if err != nil {
-		return nil, err
-	}
-	signer, ok := cert.PrivateKey.(crypto.Signer)
-	if !ok {
-		return nil, errors.New("acme/autocert: private key cannot sign")
-	}
-	if m.state == nil {
-		m.state = make(map[string]*certState)
-	}
-	s := &certState{
-		key:  signer,
-		cert: cert.Certificate,
-		leaf: cert.Leaf,
-	}
-	m.state[name] = s
-	go m.renew(name, s.key, s.leaf.NotAfter)
-	return cert, nil
-}
-
-// cacheGet always returns a valid certificate, or an error otherwise.
-// If a cached certficate exists but is not valid, ErrCacheMiss is returned.
-func (m *Manager) cacheGet(ctx context.Context, domain string) (*tls.Certificate, error) {
-	if m.Cache == nil {
-		return nil, ErrCacheMiss
-	}
-	data, err := m.Cache.Get(ctx, domain)
-	if err != nil {
-		return nil, err
-	}
-
-	// private
-	priv, pub := pem.Decode(data)
-	if priv == nil || !strings.Contains(priv.Type, "PRIVATE") {
-		return nil, ErrCacheMiss
-	}
-	privKey, err := parsePrivateKey(priv.Bytes)
-	if err != nil {
-		return nil, err
-	}
-
-	// public
-	var pubDER [][]byte
-	for len(pub) > 0 {
-		var b *pem.Block
-		b, pub = pem.Decode(pub)
-		if b == nil {
-			break
-		}
-		pubDER = append(pubDER, b.Bytes)
-	}
-	if len(pub) > 0 {
-		// Leftover content not consumed by pem.Decode. Corrupt. Ignore.
-		return nil, ErrCacheMiss
-	}
-
-	// verify and create TLS cert
-	leaf, err := validCert(domain, pubDER, privKey)
-	if err != nil {
-		return nil, ErrCacheMiss
-	}
-	tlscert := &tls.Certificate{
-		Certificate: pubDER,
-		PrivateKey:  privKey,
-		Leaf:        leaf,
-	}
-	return tlscert, nil
-}
-
-func (m *Manager) cachePut(ctx context.Context, domain string, tlscert *tls.Certificate) error {
-	if m.Cache == nil {
-		return nil
-	}
-
-	// contains PEM-encoded data
-	var buf bytes.Buffer
-
-	// private
-	switch key := tlscert.PrivateKey.(type) {
-	case *ecdsa.PrivateKey:
-		if err := encodeECDSAKey(&buf, key); err != nil {
-			return err
-		}
-	case *rsa.PrivateKey:
-		b := x509.MarshalPKCS1PrivateKey(key)
-		pb := &pem.Block{Type: "RSA PRIVATE KEY", Bytes: b}
-		if err := pem.Encode(&buf, pb); err != nil {
-			return err
-		}
-	default:
-		return errors.New("acme/autocert: unknown private key type")
-	}
-
-	// public
-	for _, b := range tlscert.Certificate {
-		pb := &pem.Block{Type: "CERTIFICATE", Bytes: b}
-		if err := pem.Encode(&buf, pb); err != nil {
-			return err
-		}
-	}
-
-	return m.Cache.Put(ctx, domain, buf.Bytes())
-}
-
-func encodeECDSAKey(w io.Writer, key *ecdsa.PrivateKey) error {
-	b, err := x509.MarshalECPrivateKey(key)
-	if err != nil {
-		return err
-	}
-	pb := &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
-	return pem.Encode(w, pb)
-}
-
-// createCert starts the domain ownership verification and returns a certificate
-// for that domain upon success.
-//
-// If the domain is already being verified, it waits for the existing verification to complete.
-// Either way, createCert blocks for the duration of the whole process.
-func (m *Manager) createCert(ctx context.Context, domain string) (*tls.Certificate, error) {
-	// TODO: maybe rewrite this whole piece using sync.Once
-	state, err := m.certState(domain)
-	if err != nil {
-		return nil, err
-	}
-	// state may exist if another goroutine is already working on it
-	// in which case just wait for it to finish
-	if !state.locked {
-		state.RLock()
-		defer state.RUnlock()
-		return state.tlscert()
-	}
-
-	// We are the first; state is locked.
-	// Unblock the readers when domain ownership is verified
-	// and the we got the cert or the process failed.
-	defer state.Unlock()
-	state.locked = false
-
-	der, leaf, err := m.authorizedCert(ctx, state.key, domain)
-	if err != nil {
-		// Remove the failed state after some time,
-		// making the manager call createCert again on the following TLS hello.
-		time.AfterFunc(createCertRetryAfter, func() {
-			defer testDidRemoveState(domain)
-			m.stateMu.Lock()
-			defer m.stateMu.Unlock()
-			// Verify the state hasn't changed and it's still invalid
-			// before deleting.
-			s, ok := m.state[domain]
-			if !ok {
-				return
-			}
-			if _, err := validCert(domain, s.cert, s.key); err == nil {
-				return
-			}
-			delete(m.state, domain)
-		})
-		return nil, err
-	}
-	state.cert = der
-	state.leaf = leaf
-	go m.renew(domain, state.key, state.leaf.NotAfter)
-	return state.tlscert()
-}
-
-// certState returns a new or existing certState.
-// If a new certState is returned, state.exist is false and the state is locked.
-// The returned error is non-nil only in the case where a new state could not be created.
-func (m *Manager) certState(domain string) (*certState, error) {
-	m.stateMu.Lock()
-	defer m.stateMu.Unlock()
-	if m.state == nil {
-		m.state = make(map[string]*certState)
-	}
-	// existing state
-	if state, ok := m.state[domain]; ok {
-		return state, nil
-	}
-
-	// new locked state
-	var (
-		err error
-		key crypto.Signer
-	)
-	if m.ForceRSA {
-		key, err = rsa.GenerateKey(rand.Reader, 2048)
-	} else {
-		key, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	}
-	if err != nil {
-		return nil, err
-	}
-
-	state := &certState{
-		key:    key,
-		locked: true,
-	}
-	state.Lock() // will be unlocked by m.certState caller
-	m.state[domain] = state
-	return state, nil
-}
-
-// authorizedCert starts domain ownership verification process and requests a new cert upon success.
-// The key argument is the certificate private key.
-func (m *Manager) authorizedCert(ctx context.Context, key crypto.Signer, domain string) (der [][]byte, leaf *x509.Certificate, err error) {
-	if err := m.verify(ctx, domain); err != nil {
-		return nil, nil, err
-	}
-	client, err := m.acmeClient(ctx)
-	if err != nil {
-		return nil, nil, err
-	}
-	csr, err := certRequest(key, domain)
-	if err != nil {
-		return nil, nil, err
-	}
-	der, _, err = client.CreateCert(ctx, csr, 0, true)
-	if err != nil {
-		return nil, nil, err
-	}
-	leaf, err = validCert(domain, der, key)
-	if err != nil {
-		return nil, nil, err
-	}
-	return der, leaf, nil
-}
-
-// verify starts a new identifier (domain) authorization flow.
-// It prepares a challenge response and then blocks until the authorization
-// is marked as "completed" by the CA (either succeeded or failed).
-//
-// verify returns nil iff the verification was successful.
-func (m *Manager) verify(ctx context.Context, domain string) error {
-	client, err := m.acmeClient(ctx)
-	if err != nil {
-		return err
-	}
-
-	// start domain authorization and get the challenge
-	authz, err := client.Authorize(ctx, domain)
-	if err != nil {
-		return err
-	}
-	// maybe don't need to at all
-	if authz.Status == acme.StatusValid {
-		return nil
-	}
-
-	// pick a challenge: prefer tls-sni-02 over tls-sni-01
-	// TODO: consider authz.Combinations
-	var chal *acme.Challenge
-	for _, c := range authz.Challenges {
-		if c.Type == "tls-sni-02" {
-			chal = c
-			break
-		}
-		if c.Type == "tls-sni-01" {
-			chal = c
-		}
-	}
-	if chal == nil {
-		return errors.New("acme/autocert: no supported challenge type found")
-	}
-
-	// create a token cert for the challenge response
-	var (
-		cert tls.Certificate
-		name string
-	)
-	switch chal.Type {
-	case "tls-sni-01":
-		cert, name, err = client.TLSSNI01ChallengeCert(chal.Token)
-	case "tls-sni-02":
-		cert, name, err = client.TLSSNI02ChallengeCert(chal.Token)
-	default:
-		err = fmt.Errorf("acme/autocert: unknown challenge type %q", chal.Type)
-	}
-	if err != nil {
-		return err
-	}
-	m.putTokenCert(ctx, name, &cert)
-	defer func() {
-		// verification has ended at this point
-		// don't need token cert anymore
-		go m.deleteTokenCert(name)
-	}()
-
-	// ready to fulfill the challenge
-	if _, err := client.Accept(ctx, chal); err != nil {
-		return err
-	}
-	// wait for the CA to validate
-	_, err = client.WaitAuthorization(ctx, authz.URI)
-	return err
-}
-
-// putTokenCert stores the cert under the named key in both m.tokenCert map
-// and m.Cache.
-func (m *Manager) putTokenCert(ctx context.Context, name string, cert *tls.Certificate) {
-	m.tokenCertMu.Lock()
-	defer m.tokenCertMu.Unlock()
-	if m.tokenCert == nil {
-		m.tokenCert = make(map[string]*tls.Certificate)
-	}
-	m.tokenCert[name] = cert
-	m.cachePut(ctx, name, cert)
-}
-
-// deleteTokenCert removes the token certificate for the specified domain name
-// from both m.tokenCert map and m.Cache.
-func (m *Manager) deleteTokenCert(name string) {
-	m.tokenCertMu.Lock()
-	defer m.tokenCertMu.Unlock()
-	delete(m.tokenCert, name)
-	if m.Cache != nil {
-		m.Cache.Delete(context.Background(), name)
-	}
-}
-
-// renew starts a cert renewal timer loop, one per domain.
-//
-// The loop is scheduled in two cases:
-// - a cert was fetched from cache for the first time (wasn't in m.state)
-// - a new cert was created by m.createCert
-//
-// The key argument is a certificate private key.
-// The exp argument is the cert expiration time (NotAfter).
-func (m *Manager) renew(domain string, key crypto.Signer, exp time.Time) {
-	m.renewalMu.Lock()
-	defer m.renewalMu.Unlock()
-	if m.renewal[domain] != nil {
-		// another goroutine is already on it
-		return
-	}
-	if m.renewal == nil {
-		m.renewal = make(map[string]*domainRenewal)
-	}
-	dr := &domainRenewal{m: m, domain: domain, key: key}
-	m.renewal[domain] = dr
-	dr.start(exp)
-}
-
-// stopRenew stops all currently running cert renewal timers.
-// The timers are not restarted during the lifetime of the Manager.
-func (m *Manager) stopRenew() {
-	m.renewalMu.Lock()
-	defer m.renewalMu.Unlock()
-	for name, dr := range m.renewal {
-		delete(m.renewal, name)
-		dr.stop()
-	}
-}
-
-func (m *Manager) accountKey(ctx context.Context) (crypto.Signer, error) {
-	const keyName = "acme_account.key"
-
-	genKey := func() (*ecdsa.PrivateKey, error) {
-		return ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	}
-
-	if m.Cache == nil {
-		return genKey()
-	}
-
-	data, err := m.Cache.Get(ctx, keyName)
-	if err == ErrCacheMiss {
-		key, err := genKey()
-		if err != nil {
-			return nil, err
-		}
-		var buf bytes.Buffer
-		if err := encodeECDSAKey(&buf, key); err != nil {
-			return nil, err
-		}
-		if err := m.Cache.Put(ctx, keyName, buf.Bytes()); err != nil {
-			return nil, err
-		}
-		return key, nil
-	}
-	if err != nil {
-		return nil, err
-	}
-
-	priv, _ := pem.Decode(data)
-	if priv == nil || !strings.Contains(priv.Type, "PRIVATE") {
-		return nil, errors.New("acme/autocert: invalid account key found in cache")
-	}
-	return parsePrivateKey(priv.Bytes)
-}
-
-func (m *Manager) acmeClient(ctx context.Context) (*acme.Client, error) {
-	m.clientMu.Lock()
-	defer m.clientMu.Unlock()
-	if m.client != nil {
-		return m.client, nil
-	}
-
-	client := m.Client
-	if client == nil {
-		client = &acme.Client{DirectoryURL: acme.LetsEncryptURL}
-	}
-	if client.Key == nil {
-		var err error
-		client.Key, err = m.accountKey(ctx)
-		if err != nil {
-			return nil, err
-		}
-	}
-	var contact []string
-	if m.Email != "" {
-		contact = []string{"mailto:" + m.Email}
-	}
-	a := &acme.Account{Contact: contact}
-	_, err := client.Register(ctx, a, m.Prompt)
-	if ae, ok := err.(*acme.Error); err == nil || ok && ae.StatusCode == http.StatusConflict {
-		// conflict indicates the key is already registered
-		m.client = client
-		err = nil
-	}
-	return m.client, err
-}
-
-func (m *Manager) hostPolicy() HostPolicy {
-	if m.HostPolicy != nil {
-		return m.HostPolicy
-	}
-	return defaultHostPolicy
-}
-
-func (m *Manager) renewBefore() time.Duration {
-	if m.RenewBefore > renewJitter {
-		return m.RenewBefore
-	}
-	return 720 * time.Hour // 30 days
-}
-
-// certState is ready when its mutex is unlocked for reading.
-type certState struct {
-	sync.RWMutex
-	locked bool              // locked for read/write
-	key    crypto.Signer     // private key for cert
-	cert   [][]byte          // DER encoding
-	leaf   *x509.Certificate // parsed cert[0]; always non-nil if cert != nil
-}
-
-// tlscert creates a tls.Certificate from s.key and s.cert.
-// Callers should wrap it in s.RLock() and s.RUnlock().
-func (s *certState) tlscert() (*tls.Certificate, error) {
-	if s.key == nil {
-		return nil, errors.New("acme/autocert: missing signer")
-	}
-	if len(s.cert) == 0 {
-		return nil, errors.New("acme/autocert: missing certificate")
-	}
-	return &tls.Certificate{
-		PrivateKey:  s.key,
-		Certificate: s.cert,
-		Leaf:        s.leaf,
-	}, nil
-}
-
-// certRequest creates a certificate request for the given common name cn
-// and optional SANs.
-func certRequest(key crypto.Signer, cn string, san ...string) ([]byte, error) {
-	req := &x509.CertificateRequest{
-		Subject:  pkix.Name{CommonName: cn},
-		DNSNames: san,
-	}
-	return x509.CreateCertificateRequest(rand.Reader, req, key)
-}
-
-// Attempt to parse the given private key DER block. OpenSSL 0.9.8 generates
-// PKCS#1 private keys by default, while OpenSSL 1.0.0 generates PKCS#8 keys.
-// OpenSSL ecparam generates SEC1 EC private keys for ECDSA. We try all three.
-//
-// Inspired by parsePrivateKey in crypto/tls/tls.go.
-func parsePrivateKey(der []byte) (crypto.Signer, error) {
-	if key, err := x509.ParsePKCS1PrivateKey(der); err == nil {
-		return key, nil
-	}
-	if key, err := x509.ParsePKCS8PrivateKey(der); err == nil {
-		switch key := key.(type) {
-		case *rsa.PrivateKey:
-			return key, nil
-		case *ecdsa.PrivateKey:
-			return key, nil
-		default:
-			return nil, errors.New("acme/autocert: unknown private key type in PKCS#8 wrapping")
-		}
-	}
-	if key, err := x509.ParseECPrivateKey(der); err == nil {
-		return key, nil
-	}
-
-	return nil, errors.New("acme/autocert: failed to parse private key")
-}
-
-// validCert parses a cert chain provided as der argument and verifies the leaf, der[0],
-// corresponds to the private key, as well as the domain match and expiration dates.
-// It doesn't do any revocation checking.
-//
-// The returned value is the verified leaf cert.
-func validCert(domain string, der [][]byte, key crypto.Signer) (leaf *x509.Certificate, err error) {
-	// parse public part(s)
-	var n int
-	for _, b := range der {
-		n += len(b)
-	}
-	pub := make([]byte, n)
-	n = 0
-	for _, b := range der {
-		n += copy(pub[n:], b)
-	}
-	x509Cert, err := x509.ParseCertificates(pub)
-	if len(x509Cert) == 0 {
-		return nil, errors.New("acme/autocert: no public key found")
-	}
-	// verify the leaf is not expired and matches the domain name
-	leaf = x509Cert[0]
-	now := timeNow()
-	if now.Before(leaf.NotBefore) {
-		return nil, errors.New("acme/autocert: certificate is not valid yet")
-	}
-	if now.After(leaf.NotAfter) {
-		return nil, errors.New("acme/autocert: expired certificate")
-	}
-	if err := leaf.VerifyHostname(domain); err != nil {
-		return nil, err
-	}
-	// ensure the leaf corresponds to the private key
-	switch pub := leaf.PublicKey.(type) {
-	case *rsa.PublicKey:
-		prv, ok := key.(*rsa.PrivateKey)
-		if !ok {
-			return nil, errors.New("acme/autocert: private key type does not match public key type")
-		}
-		if pub.N.Cmp(prv.N) != 0 {
-			return nil, errors.New("acme/autocert: private key does not match public key")
-		}
-	case *ecdsa.PublicKey:
-		prv, ok := key.(*ecdsa.PrivateKey)
-		if !ok {
-			return nil, errors.New("acme/autocert: private key type does not match public key type")
-		}
-		if pub.X.Cmp(prv.X) != 0 || pub.Y.Cmp(prv.Y) != 0 {
-			return nil, errors.New("acme/autocert: private key does not match public key")
-		}
-	default:
-		return nil, errors.New("acme/autocert: unknown public key algorithm")
-	}
-	return leaf, nil
-}
-
-func retryAfter(v string) time.Duration {
-	if i, err := strconv.Atoi(v); err == nil {
-		return time.Duration(i) * time.Second
-	}
-	if t, err := http.ParseTime(v); err == nil {
-		return t.Sub(timeNow())
-	}
-	return time.Second
-}
-
-type lockedMathRand struct {
-	sync.Mutex
-	rnd *mathrand.Rand
-}
-
-func (r *lockedMathRand) int63n(max int64) int64 {
-	r.Lock()
-	n := r.rnd.Int63n(max)
-	r.Unlock()
-	return n
-}
-
-// For easier testing.
-var (
-	timeNow = time.Now
-
-	// Called when a state is removed.
-	testDidRemoveState = func(domain string) {}
-)
diff --git a/vendor/golang.org/x/crypto/acme/autocert/autocert_test.go b/vendor/golang.org/x/crypto/acme/autocert/autocert_test.go
deleted file mode 100644
index 0352e34..0000000
--- a/vendor/golang.org/x/crypto/acme/autocert/autocert_test.go
+++ /dev/null
@@ -1,606 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package autocert
-
-import (
-	"context"
-	"crypto"
-	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
-	"crypto/rsa"
-	"crypto/tls"
-	"crypto/x509"
-	"crypto/x509/pkix"
-	"encoding/base64"
-	"encoding/json"
-	"fmt"
-	"html/template"
-	"io"
-	"math/big"
-	"net/http"
-	"net/http/httptest"
-	"reflect"
-	"sync"
-	"testing"
-	"time"
-
-	"golang.org/x/crypto/acme"
-)
-
-var discoTmpl = template.Must(template.New("disco").Parse(`{
-	"new-reg": "{{.}}/new-reg",
-	"new-authz": "{{.}}/new-authz",
-	"new-cert": "{{.}}/new-cert"
-}`))
-
-var authzTmpl = template.Must(template.New("authz").Parse(`{
-	"status": "pending",
-	"challenges": [
-		{
-			"uri": "{{.}}/challenge/1",
-			"type": "tls-sni-01",
-			"token": "token-01"
-		},
-		{
-			"uri": "{{.}}/challenge/2",
-			"type": "tls-sni-02",
-			"token": "token-02"
-		}
-	]
-}`))
-
-type memCache struct {
-	mu      sync.Mutex
-	keyData map[string][]byte
-}
-
-func (m *memCache) Get(ctx context.Context, key string) ([]byte, error) {
-	m.mu.Lock()
-	defer m.mu.Unlock()
-
-	v, ok := m.keyData[key]
-	if !ok {
-		return nil, ErrCacheMiss
-	}
-	return v, nil
-}
-
-func (m *memCache) Put(ctx context.Context, key string, data []byte) error {
-	m.mu.Lock()
-	defer m.mu.Unlock()
-
-	m.keyData[key] = data
-	return nil
-}
-
-func (m *memCache) Delete(ctx context.Context, key string) error {
-	m.mu.Lock()
-	defer m.mu.Unlock()
-
-	delete(m.keyData, key)
-	return nil
-}
-
-func newMemCache() *memCache {
-	return &memCache{
-		keyData: make(map[string][]byte),
-	}
-}
-
-func dummyCert(pub interface{}, san ...string) ([]byte, error) {
-	return dateDummyCert(pub, time.Now(), time.Now().Add(90*24*time.Hour), san...)
-}
-
-func dateDummyCert(pub interface{}, start, end time.Time, san ...string) ([]byte, error) {
-	// use EC key to run faster on 386
-	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	if err != nil {
-		return nil, err
-	}
-	t := &x509.Certificate{
-		SerialNumber:          big.NewInt(1),
-		NotBefore:             start,
-		NotAfter:              end,
-		BasicConstraintsValid: true,
-		KeyUsage:              x509.KeyUsageKeyEncipherment,
-		DNSNames:              san,
-	}
-	if pub == nil {
-		pub = &key.PublicKey
-	}
-	return x509.CreateCertificate(rand.Reader, t, t, pub, key)
-}
-
-func decodePayload(v interface{}, r io.Reader) error {
-	var req struct{ Payload string }
-	if err := json.NewDecoder(r).Decode(&req); err != nil {
-		return err
-	}
-	payload, err := base64.RawURLEncoding.DecodeString(req.Payload)
-	if err != nil {
-		return err
-	}
-	return json.Unmarshal(payload, v)
-}
-
-func TestGetCertificate(t *testing.T) {
-	man := &Manager{Prompt: AcceptTOS}
-	defer man.stopRenew()
-	hello := &tls.ClientHelloInfo{ServerName: "example.org"}
-	testGetCertificate(t, man, "example.org", hello)
-}
-
-func TestGetCertificate_trailingDot(t *testing.T) {
-	man := &Manager{Prompt: AcceptTOS}
-	defer man.stopRenew()
-	hello := &tls.ClientHelloInfo{ServerName: "example.org."}
-	testGetCertificate(t, man, "example.org", hello)
-}
-
-func TestGetCertificate_ForceRSA(t *testing.T) {
-	man := &Manager{
-		Prompt:   AcceptTOS,
-		Cache:    newMemCache(),
-		ForceRSA: true,
-	}
-	defer man.stopRenew()
-	hello := &tls.ClientHelloInfo{ServerName: "example.org"}
-	testGetCertificate(t, man, "example.org", hello)
-
-	cert, err := man.cacheGet(context.Background(), "example.org")
-	if err != nil {
-		t.Fatalf("man.cacheGet: %v", err)
-	}
-	if _, ok := cert.PrivateKey.(*rsa.PrivateKey); !ok {
-		t.Errorf("cert.PrivateKey is %T; want *rsa.PrivateKey", cert.PrivateKey)
-	}
-}
-
-func TestGetCertificate_nilPrompt(t *testing.T) {
-	man := &Manager{}
-	defer man.stopRenew()
-	url, finish := startACMEServerStub(t, man, "example.org")
-	defer finish()
-	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	if err != nil {
-		t.Fatal(err)
-	}
-	man.Client = &acme.Client{
-		Key:          key,
-		DirectoryURL: url,
-	}
-	hello := &tls.ClientHelloInfo{ServerName: "example.org"}
-	if _, err := man.GetCertificate(hello); err == nil {
-		t.Error("got certificate for example.org; wanted error")
-	}
-}
-
-func TestGetCertificate_expiredCache(t *testing.T) {
-	// Make an expired cert and cache it.
-	pk, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	if err != nil {
-		t.Fatal(err)
-	}
-	tmpl := &x509.Certificate{
-		SerialNumber: big.NewInt(1),
-		Subject:      pkix.Name{CommonName: "example.org"},
-		NotAfter:     time.Now(),
-	}
-	pub, err := x509.CreateCertificate(rand.Reader, tmpl, tmpl, &pk.PublicKey, pk)
-	if err != nil {
-		t.Fatal(err)
-	}
-	tlscert := &tls.Certificate{
-		Certificate: [][]byte{pub},
-		PrivateKey:  pk,
-	}
-
-	man := &Manager{Prompt: AcceptTOS, Cache: newMemCache()}
-	defer man.stopRenew()
-	if err := man.cachePut(context.Background(), "example.org", tlscert); err != nil {
-		t.Fatalf("man.cachePut: %v", err)
-	}
-
-	// The expired cached cert should trigger a new cert issuance
-	// and return without an error.
-	hello := &tls.ClientHelloInfo{ServerName: "example.org"}
-	testGetCertificate(t, man, "example.org", hello)
-}
-
-func TestGetCertificate_failedAttempt(t *testing.T) {
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.WriteHeader(http.StatusBadRequest)
-	}))
-	defer ts.Close()
-
-	const example = "example.org"
-	d := createCertRetryAfter
-	f := testDidRemoveState
-	defer func() {
-		createCertRetryAfter = d
-		testDidRemoveState = f
-	}()
-	createCertRetryAfter = 0
-	done := make(chan struct{})
-	testDidRemoveState = func(domain string) {
-		if domain != example {
-			t.Errorf("testDidRemoveState: domain = %q; want %q", domain, example)
-		}
-		close(done)
-	}
-
-	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	if err != nil {
-		t.Fatal(err)
-	}
-	man := &Manager{
-		Prompt: AcceptTOS,
-		Client: &acme.Client{
-			Key:          key,
-			DirectoryURL: ts.URL,
-		},
-	}
-	defer man.stopRenew()
-	hello := &tls.ClientHelloInfo{ServerName: example}
-	if _, err := man.GetCertificate(hello); err == nil {
-		t.Error("GetCertificate: err is nil")
-	}
-	select {
-	case <-time.After(5 * time.Second):
-		t.Errorf("took too long to remove the %q state", example)
-	case <-done:
-		man.stateMu.Lock()
-		defer man.stateMu.Unlock()
-		if v, exist := man.state[example]; exist {
-			t.Errorf("state exists for %q: %+v", example, v)
-		}
-	}
-}
-
-// startACMEServerStub runs an ACME server
-// The domain argument is the expected domain name of a certificate request.
-func startACMEServerStub(t *testing.T, man *Manager, domain string) (url string, finish func()) {
-	// echo token-02 | shasum -a 256
-	// then divide result in 2 parts separated by dot
-	tokenCertName := "4e8eb87631187e9ff2153b56b13a4dec.13a35d002e485d60ff37354b32f665d9.token.acme.invalid"
-	verifyTokenCert := func() {
-		hello := &tls.ClientHelloInfo{ServerName: tokenCertName}
-		_, err := man.GetCertificate(hello)
-		if err != nil {
-			t.Errorf("verifyTokenCert: GetCertificate(%q): %v", tokenCertName, err)
-			return
-		}
-	}
-
-	// ACME CA server stub
-	var ca *httptest.Server
-	ca = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.Header().Set("replay-nonce", "nonce")
-		if r.Method == "HEAD" {
-			// a nonce request
-			return
-		}
-
-		switch r.URL.Path {
-		// discovery
-		case "/":
-			if err := discoTmpl.Execute(w, ca.URL); err != nil {
-				t.Errorf("discoTmpl: %v", err)
-			}
-		// client key registration
-		case "/new-reg":
-			w.Write([]byte("{}"))
-		// domain authorization
-		case "/new-authz":
-			w.Header().Set("location", ca.URL+"/authz/1")
-			w.WriteHeader(http.StatusCreated)
-			if err := authzTmpl.Execute(w, ca.URL); err != nil {
-				t.Errorf("authzTmpl: %v", err)
-			}
-		// accept tls-sni-02 challenge
-		case "/challenge/2":
-			verifyTokenCert()
-			w.Write([]byte("{}"))
-		// authorization status
-		case "/authz/1":
-			w.Write([]byte(`{"status": "valid"}`))
-		// cert request
-		case "/new-cert":
-			var req struct {
-				CSR string `json:"csr"`
-			}
-			decodePayload(&req, r.Body)
-			b, _ := base64.RawURLEncoding.DecodeString(req.CSR)
-			csr, err := x509.ParseCertificateRequest(b)
-			if err != nil {
-				t.Errorf("new-cert: CSR: %v", err)
-			}
-			if csr.Subject.CommonName != domain {
-				t.Errorf("CommonName in CSR = %q; want %q", csr.Subject.CommonName, domain)
-			}
-			der, err := dummyCert(csr.PublicKey, domain)
-			if err != nil {
-				t.Errorf("new-cert: dummyCert: %v", err)
-			}
-			chainUp := fmt.Sprintf("<%s/ca-cert>; rel=up", ca.URL)
-			w.Header().Set("link", chainUp)
-			w.WriteHeader(http.StatusCreated)
-			w.Write(der)
-		// CA chain cert
-		case "/ca-cert":
-			der, err := dummyCert(nil, "ca")
-			if err != nil {
-				t.Errorf("ca-cert: dummyCert: %v", err)
-			}
-			w.Write(der)
-		default:
-			t.Errorf("unrecognized r.URL.Path: %s", r.URL.Path)
-		}
-	}))
-	finish = func() {
-		ca.Close()
-
-		// make sure token cert was removed
-		cancel := make(chan struct{})
-		done := make(chan struct{})
-		go func() {
-			defer close(done)
-			tick := time.NewTicker(100 * time.Millisecond)
-			defer tick.Stop()
-			for {
-				hello := &tls.ClientHelloInfo{ServerName: tokenCertName}
-				if _, err := man.GetCertificate(hello); err != nil {
-					return
-				}
-				select {
-				case <-tick.C:
-				case <-cancel:
-					return
-				}
-			}
-		}()
-		select {
-		case <-done:
-		case <-time.After(5 * time.Second):
-			close(cancel)
-			t.Error("token cert was not removed")
-			<-done
-		}
-	}
-	return ca.URL, finish
-}
-
-// tests man.GetCertificate flow using the provided hello argument.
-// The domain argument is the expected domain name of a certificate request.
-func testGetCertificate(t *testing.T, man *Manager, domain string, hello *tls.ClientHelloInfo) {
-	url, finish := startACMEServerStub(t, man, domain)
-	defer finish()
-
-	// use EC key to run faster on 386
-	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	if err != nil {
-		t.Fatal(err)
-	}
-	man.Client = &acme.Client{
-		Key:          key,
-		DirectoryURL: url,
-	}
-
-	// simulate tls.Config.GetCertificate
-	var tlscert *tls.Certificate
-	done := make(chan struct{})
-	go func() {
-		tlscert, err = man.GetCertificate(hello)
-		close(done)
-	}()
-	select {
-	case <-time.After(time.Minute):
-		t.Fatal("man.GetCertificate took too long to return")
-	case <-done:
-	}
-	if err != nil {
-		t.Fatalf("man.GetCertificate: %v", err)
-	}
-
-	// verify the tlscert is the same we responded with from the CA stub
-	if len(tlscert.Certificate) == 0 {
-		t.Fatal("len(tlscert.Certificate) is 0")
-	}
-	cert, err := x509.ParseCertificate(tlscert.Certificate[0])
-	if err != nil {
-		t.Fatalf("x509.ParseCertificate: %v", err)
-	}
-	if len(cert.DNSNames) == 0 || cert.DNSNames[0] != domain {
-		t.Errorf("cert.DNSNames = %v; want %q", cert.DNSNames, domain)
-	}
-
-}
-
-func TestAccountKeyCache(t *testing.T) {
-	m := Manager{Cache: newMemCache()}
-	ctx := context.Background()
-	k1, err := m.accountKey(ctx)
-	if err != nil {
-		t.Fatal(err)
-	}
-	k2, err := m.accountKey(ctx)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if !reflect.DeepEqual(k1, k2) {
-		t.Errorf("account keys don't match: k1 = %#v; k2 = %#v", k1, k2)
-	}
-}
-
-func TestCache(t *testing.T) {
-	privKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	if err != nil {
-		t.Fatal(err)
-	}
-	tmpl := &x509.Certificate{
-		SerialNumber: big.NewInt(1),
-		Subject:      pkix.Name{CommonName: "example.org"},
-		NotAfter:     time.Now().Add(time.Hour),
-	}
-	pub, err := x509.CreateCertificate(rand.Reader, tmpl, tmpl, &privKey.PublicKey, privKey)
-	if err != nil {
-		t.Fatal(err)
-	}
-	tlscert := &tls.Certificate{
-		Certificate: [][]byte{pub},
-		PrivateKey:  privKey,
-	}
-
-	man := &Manager{Cache: newMemCache()}
-	defer man.stopRenew()
-	ctx := context.Background()
-	if err := man.cachePut(ctx, "example.org", tlscert); err != nil {
-		t.Fatalf("man.cachePut: %v", err)
-	}
-	res, err := man.cacheGet(ctx, "example.org")
-	if err != nil {
-		t.Fatalf("man.cacheGet: %v", err)
-	}
-	if res == nil {
-		t.Fatal("res is nil")
-	}
-}
-
-func TestHostWhitelist(t *testing.T) {
-	policy := HostWhitelist("example.com", "example.org", "*.example.net")
-	tt := []struct {
-		host  string
-		allow bool
-	}{
-		{"example.com", true},
-		{"example.org", true},
-		{"one.example.com", false},
-		{"two.example.org", false},
-		{"three.example.net", false},
-		{"dummy", false},
-	}
-	for i, test := range tt {
-		err := policy(nil, test.host)
-		if err != nil && test.allow {
-			t.Errorf("%d: policy(%q): %v; want nil", i, test.host, err)
-		}
-		if err == nil && !test.allow {
-			t.Errorf("%d: policy(%q): nil; want an error", i, test.host)
-		}
-	}
-}
-
-func TestValidCert(t *testing.T) {
-	key1, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	if err != nil {
-		t.Fatal(err)
-	}
-	key2, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	if err != nil {
-		t.Fatal(err)
-	}
-	key3, err := rsa.GenerateKey(rand.Reader, 512)
-	if err != nil {
-		t.Fatal(err)
-	}
-	cert1, err := dummyCert(key1.Public(), "example.org")
-	if err != nil {
-		t.Fatal(err)
-	}
-	cert2, err := dummyCert(key2.Public(), "example.org")
-	if err != nil {
-		t.Fatal(err)
-	}
-	cert3, err := dummyCert(key3.Public(), "example.org")
-	if err != nil {
-		t.Fatal(err)
-	}
-	now := time.Now()
-	early, err := dateDummyCert(key1.Public(), now.Add(time.Hour), now.Add(2*time.Hour), "example.org")
-	if err != nil {
-		t.Fatal(err)
-	}
-	expired, err := dateDummyCert(key1.Public(), now.Add(-2*time.Hour), now.Add(-time.Hour), "example.org")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	tt := []struct {
-		domain string
-		key    crypto.Signer
-		cert   [][]byte
-		ok     bool
-	}{
-		{"example.org", key1, [][]byte{cert1}, true},
-		{"example.org", key3, [][]byte{cert3}, true},
-		{"example.org", key1, [][]byte{cert1, cert2, cert3}, true},
-		{"example.org", key1, [][]byte{cert1, {1}}, false},
-		{"example.org", key1, [][]byte{{1}}, false},
-		{"example.org", key1, [][]byte{cert2}, false},
-		{"example.org", key2, [][]byte{cert1}, false},
-		{"example.org", key1, [][]byte{cert3}, false},
-		{"example.org", key3, [][]byte{cert1}, false},
-		{"example.net", key1, [][]byte{cert1}, false},
-		{"example.org", key1, [][]byte{early}, false},
-		{"example.org", key1, [][]byte{expired}, false},
-	}
-	for i, test := range tt {
-		leaf, err := validCert(test.domain, test.cert, test.key)
-		if err != nil && test.ok {
-			t.Errorf("%d: err = %v", i, err)
-		}
-		if err == nil && !test.ok {
-			t.Errorf("%d: err is nil", i)
-		}
-		if err == nil && test.ok && leaf == nil {
-			t.Errorf("%d: leaf is nil", i)
-		}
-	}
-}
-
-type cacheGetFunc func(ctx context.Context, key string) ([]byte, error)
-
-func (f cacheGetFunc) Get(ctx context.Context, key string) ([]byte, error) {
-	return f(ctx, key)
-}
-
-func (f cacheGetFunc) Put(ctx context.Context, key string, data []byte) error {
-	return fmt.Errorf("unsupported Put of %q = %q", key, data)
-}
-
-func (f cacheGetFunc) Delete(ctx context.Context, key string) error {
-	return fmt.Errorf("unsupported Delete of %q", key)
-}
-
-func TestManagerGetCertificateBogusSNI(t *testing.T) {
-	m := Manager{
-		Prompt: AcceptTOS,
-		Cache: cacheGetFunc(func(ctx context.Context, key string) ([]byte, error) {
-			return nil, fmt.Errorf("cache.Get of %s", key)
-		}),
-	}
-	tests := []struct {
-		name    string
-		wantErr string
-	}{
-		{"foo.com", "cache.Get of foo.com"},
-		{"foo.com.", "cache.Get of foo.com"},
-		{`a\b.com`, "acme/autocert: server name contains invalid character"},
-		{`a/b.com`, "acme/autocert: server name contains invalid character"},
-		{"", "acme/autocert: missing server name"},
-		{"foo", "acme/autocert: server name component count invalid"},
-		{".foo", "acme/autocert: server name component count invalid"},
-		{"foo.", "acme/autocert: server name component count invalid"},
-		{"fo.o", "cache.Get of fo.o"},
-	}
-	for _, tt := range tests {
-		_, err := m.GetCertificate(&tls.ClientHelloInfo{ServerName: tt.name})
-		got := fmt.Sprint(err)
-		if got != tt.wantErr {
-			t.Errorf("GetCertificate(SNI = %q) = %q; want %q", tt.name, got, tt.wantErr)
-		}
-	}
-}
diff --git a/vendor/golang.org/x/crypto/acme/autocert/cache.go b/vendor/golang.org/x/crypto/acme/autocert/cache.go
deleted file mode 100644
index 61a5fd2..0000000
--- a/vendor/golang.org/x/crypto/acme/autocert/cache.go
+++ /dev/null
@@ -1,130 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package autocert
-
-import (
-	"context"
-	"errors"
-	"io/ioutil"
-	"os"
-	"path/filepath"
-)
-
-// ErrCacheMiss is returned when a certificate is not found in cache.
-var ErrCacheMiss = errors.New("acme/autocert: certificate cache miss")
-
-// Cache is used by Manager to store and retrieve previously obtained certificates
-// as opaque data.
-//
-// The key argument of the methods refers to a domain name but need not be an FQDN.
-// Cache implementations should not rely on the key naming pattern.
-type Cache interface {
-	// Get returns a certificate data for the specified key.
-	// If there's no such key, Get returns ErrCacheMiss.
-	Get(ctx context.Context, key string) ([]byte, error)
-
-	// Put stores the data in the cache under the specified key.
-	// Underlying implementations may use any data storage format,
-	// as long as the reverse operation, Get, results in the original data.
-	Put(ctx context.Context, key string, data []byte) error
-
-	// Delete removes a certificate data from the cache under the specified key.
-	// If there's no such key in the cache, Delete returns nil.
-	Delete(ctx context.Context, key string) error
-}
-
-// DirCache implements Cache using a directory on the local filesystem.
-// If the directory does not exist, it will be created with 0700 permissions.
-type DirCache string
-
-// Get reads a certificate data from the specified file name.
-func (d DirCache) Get(ctx context.Context, name string) ([]byte, error) {
-	name = filepath.Join(string(d), name)
-	var (
-		data []byte
-		err  error
-		done = make(chan struct{})
-	)
-	go func() {
-		data, err = ioutil.ReadFile(name)
-		close(done)
-	}()
-	select {
-	case <-ctx.Done():
-		return nil, ctx.Err()
-	case <-done:
-	}
-	if os.IsNotExist(err) {
-		return nil, ErrCacheMiss
-	}
-	return data, err
-}
-
-// Put writes the certificate data to the specified file name.
-// The file will be created with 0600 permissions.
-func (d DirCache) Put(ctx context.Context, name string, data []byte) error {
-	if err := os.MkdirAll(string(d), 0700); err != nil {
-		return err
-	}
-
-	done := make(chan struct{})
-	var err error
-	go func() {
-		defer close(done)
-		var tmp string
-		if tmp, err = d.writeTempFile(name, data); err != nil {
-			return
-		}
-		select {
-		case <-ctx.Done():
-			// Don't overwrite the file if the context was canceled.
-		default:
-			newName := filepath.Join(string(d), name)
-			err = os.Rename(tmp, newName)
-		}
-	}()
-	select {
-	case <-ctx.Done():
-		return ctx.Err()
-	case <-done:
-	}
-	return err
-}
-
-// Delete removes the specified file name.
-func (d DirCache) Delete(ctx context.Context, name string) error {
-	name = filepath.Join(string(d), name)
-	var (
-		err  error
-		done = make(chan struct{})
-	)
-	go func() {
-		err = os.Remove(name)
-		close(done)
-	}()
-	select {
-	case <-ctx.Done():
-		return ctx.Err()
-	case <-done:
-	}
-	if err != nil && !os.IsNotExist(err) {
-		return err
-	}
-	return nil
-}
-
-// writeTempFile writes b to a temporary file, closes the file and returns its path.
-func (d DirCache) writeTempFile(prefix string, b []byte) (string, error) {
-	// TempFile uses 0600 permissions
-	f, err := ioutil.TempFile(string(d), prefix)
-	if err != nil {
-		return "", err
-	}
-	if _, err := f.Write(b); err != nil {
-		f.Close()
-		return "", err
-	}
-	return f.Name(), f.Close()
-}
diff --git a/vendor/golang.org/x/crypto/acme/autocert/cache_test.go b/vendor/golang.org/x/crypto/acme/autocert/cache_test.go
deleted file mode 100644
index 6e1b88d..0000000
--- a/vendor/golang.org/x/crypto/acme/autocert/cache_test.go
+++ /dev/null
@@ -1,57 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package autocert
-
-import (
-	"context"
-	"io/ioutil"
-	"os"
-	"path/filepath"
-	"reflect"
-	"testing"
-)
-
-// make sure DirCache satisfies Cache interface
-var _ Cache = DirCache("/")
-
-func TestDirCache(t *testing.T) {
-	dir, err := ioutil.TempDir("", "autocert")
-	if err != nil {
-		t.Fatal(err)
-	}
-	dir = filepath.Join(dir, "certs") // a nonexistent dir
-	cache := DirCache(dir)
-	ctx := context.Background()
-
-	// test cache miss
-	if _, err := cache.Get(ctx, "nonexistent"); err != ErrCacheMiss {
-		t.Errorf("get: %v; want ErrCacheMiss", err)
-	}
-
-	// test put/get
-	b1 := []byte{1}
-	if err := cache.Put(ctx, "dummy", b1); err != nil {
-		t.Fatalf("put: %v", err)
-	}
-	b2, err := cache.Get(ctx, "dummy")
-	if err != nil {
-		t.Fatalf("get: %v", err)
-	}
-	if !reflect.DeepEqual(b1, b2) {
-		t.Errorf("b1 = %v; want %v", b1, b2)
-	}
-	name := filepath.Join(dir, "dummy")
-	if _, err := os.Stat(name); err != nil {
-		t.Error(err)
-	}
-
-	// test delete
-	if err := cache.Delete(ctx, "dummy"); err != nil {
-		t.Fatalf("delete: %v", err)
-	}
-	if _, err := cache.Get(ctx, "dummy"); err != ErrCacheMiss {
-		t.Errorf("get: %v; want ErrCacheMiss", err)
-	}
-}
diff --git a/vendor/golang.org/x/crypto/acme/autocert/example_test.go b/vendor/golang.org/x/crypto/acme/autocert/example_test.go
deleted file mode 100644
index c6267b8..0000000
--- a/vendor/golang.org/x/crypto/acme/autocert/example_test.go
+++ /dev/null
@@ -1,34 +0,0 @@
-// Copyright 2017 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package autocert_test
-
-import (
-	"crypto/tls"
-	"fmt"
-	"log"
-	"net/http"
-
-	"golang.org/x/crypto/acme/autocert"
-)
-
-func ExampleNewListener() {
-	mux := http.NewServeMux()
-	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		fmt.Fprintf(w, "Hello, TLS user! Your config: %+v", r.TLS)
-	})
-	log.Fatal(http.Serve(autocert.NewListener("example.com"), mux))
-}
-
-func ExampleManager() {
-	m := autocert.Manager{
-		Prompt:     autocert.AcceptTOS,
-		HostPolicy: autocert.HostWhitelist("example.org"),
-	}
-	s := &http.Server{
-		Addr:      ":https",
-		TLSConfig: &tls.Config{GetCertificate: m.GetCertificate},
-	}
-	s.ListenAndServeTLS("", "")
-}
diff --git a/vendor/golang.org/x/crypto/acme/autocert/listener.go b/vendor/golang.org/x/crypto/acme/autocert/listener.go
deleted file mode 100644
index d4c93d2..0000000
--- a/vendor/golang.org/x/crypto/acme/autocert/listener.go
+++ /dev/null
@@ -1,153 +0,0 @@
-// Copyright 2017 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package autocert
-
-import (
-	"crypto/tls"
-	"log"
-	"net"
-	"os"
-	"path/filepath"
-	"runtime"
-	"time"
-)
-
-// NewListener returns a net.Listener that listens on the standard TLS
-// port (443) on all interfaces and returns *tls.Conn connections with
-// LetsEncrypt certificates for the provided domain or domains.
-//
-// It enables one-line HTTPS servers:
-//
-//     log.Fatal(http.Serve(autocert.NewListener("example.com"), handler))
-//
-// NewListener is a convenience function for a common configuration.
-// More complex or custom configurations can use the autocert.Manager
-// type instead.
-//
-// Use of this function implies acceptance of the LetsEncrypt Terms of
-// Service. If domains is not empty, the provided domains are passed
-// to HostWhitelist. If domains is empty, the listener will do
-// LetsEncrypt challenges for any requested domain, which is not
-// recommended.
-//
-// Certificates are cached in a "golang-autocert" directory under an
-// operating system-specific cache or temp directory. This may not
-// be suitable for servers spanning multiple machines.
-//
-// The returned Listener also enables TCP keep-alives on the accepted
-// connections. The returned *tls.Conn are returned before their TLS
-// handshake has completed.
-func NewListener(domains ...string) net.Listener {
-	m := &Manager{
-		Prompt: AcceptTOS,
-	}
-	if len(domains) > 0 {
-		m.HostPolicy = HostWhitelist(domains...)
-	}
-	dir := cacheDir()
-	if err := os.MkdirAll(dir, 0700); err != nil {
-		log.Printf("warning: autocert.NewListener not using a cache: %v", err)
-	} else {
-		m.Cache = DirCache(dir)
-	}
-	return m.Listener()
-}
-
-// Listener listens on the standard TLS port (443) on all interfaces
-// and returns a net.Listener returning *tls.Conn connections.
-//
-// The returned Listener also enables TCP keep-alives on the accepted
-// connections. The returned *tls.Conn are returned before their TLS
-// handshake has completed.
-//
-// Unlike NewListener, it is the caller's responsibility to initialize
-// the Manager m's Prompt, Cache, HostPolicy, and other desired options.
-func (m *Manager) Listener() net.Listener {
-	ln := &listener{
-		m: m,
-		conf: &tls.Config{
-			GetCertificate: m.GetCertificate, // bonus: panic on nil m
-		},
-	}
-	ln.tcpListener, ln.tcpListenErr = net.Listen("tcp", ":443")
-	return ln
-}
-
-type listener struct {
-	m    *Manager
-	conf *tls.Config
-
-	tcpListener  net.Listener
-	tcpListenErr error
-}
-
-func (ln *listener) Accept() (net.Conn, error) {
-	if ln.tcpListenErr != nil {
-		return nil, ln.tcpListenErr
-	}
-	conn, err := ln.tcpListener.Accept()
-	if err != nil {
-		return nil, err
-	}
-	tcpConn := conn.(*net.TCPConn)
-
-	// Because Listener is a convenience function, help out with
-	// this too.  This is not possible for the caller to set once
-	// we return a *tcp.Conn wrapping an inaccessible net.Conn.
-	// If callers don't want this, they can do things the manual
-	// way and tweak as needed. But this is what net/http does
-	// itself, so copy that. If net/http changes, we can change
-	// here too.
-	tcpConn.SetKeepAlive(true)
-	tcpConn.SetKeepAlivePeriod(3 * time.Minute)
-
-	return tls.Server(tcpConn, ln.conf), nil
-}
-
-func (ln *listener) Addr() net.Addr {
-	if ln.tcpListener != nil {
-		return ln.tcpListener.Addr()
-	}
-	// net.Listen failed. Return something non-nil in case callers
-	// call Addr before Accept:
-	return &net.TCPAddr{IP: net.IP{0, 0, 0, 0}, Port: 443}
-}
-
-func (ln *listener) Close() error {
-	if ln.tcpListenErr != nil {
-		return ln.tcpListenErr
-	}
-	return ln.tcpListener.Close()
-}
-
-func homeDir() string {
-	if runtime.GOOS == "windows" {
-		return os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH")
-	}
-	if h := os.Getenv("HOME"); h != "" {
-		return h
-	}
-	return "/"
-}
-
-func cacheDir() string {
-	const base = "golang-autocert"
-	switch runtime.GOOS {
-	case "darwin":
-		return filepath.Join(homeDir(), "Library", "Caches", base)
-	case "windows":
-		for _, ev := range []string{"APPDATA", "CSIDL_APPDATA", "TEMP", "TMP"} {
-			if v := os.Getenv(ev); v != "" {
-				return filepath.Join(v, base)
-			}
-		}
-		// Worst case:
-		return filepath.Join(homeDir(), base)
-	}
-	if xdg := os.Getenv("XDG_CACHE_HOME"); xdg != "" {
-		return filepath.Join(xdg, base)
-	}
-	return filepath.Join(homeDir(), ".cache", base)
-}
diff --git a/vendor/golang.org/x/crypto/acme/autocert/renewal.go b/vendor/golang.org/x/crypto/acme/autocert/renewal.go
deleted file mode 100644
index 6c5da2b..0000000
--- a/vendor/golang.org/x/crypto/acme/autocert/renewal.go
+++ /dev/null
@@ -1,124 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package autocert
-
-import (
-	"context"
-	"crypto"
-	"sync"
-	"time"
-)
-
-// renewJitter is the maximum deviation from Manager.RenewBefore.
-const renewJitter = time.Hour
-
-// domainRenewal tracks the state used by the periodic timers
-// renewing a single domain's cert.
-type domainRenewal struct {
-	m      *Manager
-	domain string
-	key    crypto.Signer
-
-	timerMu sync.Mutex
-	timer   *time.Timer
-}
-
-// start starts a cert renewal timer at the time
-// defined by the certificate expiration time exp.
-//
-// If the timer is already started, calling start is a noop.
-func (dr *domainRenewal) start(exp time.Time) {
-	dr.timerMu.Lock()
-	defer dr.timerMu.Unlock()
-	if dr.timer != nil {
-		return
-	}
-	dr.timer = time.AfterFunc(dr.next(exp), dr.renew)
-}
-
-// stop stops the cert renewal timer.
-// If the timer is already stopped, calling stop is a noop.
-func (dr *domainRenewal) stop() {
-	dr.timerMu.Lock()
-	defer dr.timerMu.Unlock()
-	if dr.timer == nil {
-		return
-	}
-	dr.timer.Stop()
-	dr.timer = nil
-}
-
-// renew is called periodically by a timer.
-// The first renew call is kicked off by dr.start.
-func (dr *domainRenewal) renew() {
-	dr.timerMu.Lock()
-	defer dr.timerMu.Unlock()
-	if dr.timer == nil {
-		return
-	}
-
-	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Minute)
-	defer cancel()
-	// TODO: rotate dr.key at some point?
-	next, err := dr.do(ctx)
-	if err != nil {
-		next = renewJitter / 2
-		next += time.Duration(pseudoRand.int63n(int64(next)))
-	}
-	dr.timer = time.AfterFunc(next, dr.renew)
-	testDidRenewLoop(next, err)
-}
-
-// do is similar to Manager.createCert but it doesn't lock a Manager.state item.
-// Instead, it requests a new certificate independently and, upon success,
-// replaces dr.m.state item with a new one and updates cache for the given domain.
-//
-// It may return immediately if the expiration date of the currently cached cert
-// is far enough in the future.
-//
-// The returned value is a time interval after which the renewal should occur again.
-func (dr *domainRenewal) do(ctx context.Context) (time.Duration, error) {
-	// a race is likely unavoidable in a distributed environment
-	// but we try nonetheless
-	if tlscert, err := dr.m.cacheGet(ctx, dr.domain); err == nil {
-		next := dr.next(tlscert.Leaf.NotAfter)
-		if next > dr.m.renewBefore()+renewJitter {
-			return next, nil
-		}
-	}
-
-	der, leaf, err := dr.m.authorizedCert(ctx, dr.key, dr.domain)
-	if err != nil {
-		return 0, err
-	}
-	state := &certState{
-		key:  dr.key,
-		cert: der,
-		leaf: leaf,
-	}
-	tlscert, err := state.tlscert()
-	if err != nil {
-		return 0, err
-	}
-	dr.m.cachePut(ctx, dr.domain, tlscert)
-	dr.m.stateMu.Lock()
-	defer dr.m.stateMu.Unlock()
-	// m.state is guaranteed to be non-nil at this point
-	dr.m.state[dr.domain] = state
-	return dr.next(leaf.NotAfter), nil
-}
-
-func (dr *domainRenewal) next(expiry time.Time) time.Duration {
-	d := expiry.Sub(timeNow()) - dr.m.renewBefore()
-	// add a bit of randomness to renew deadline
-	n := pseudoRand.int63n(int64(renewJitter))
-	d -= time.Duration(n)
-	if d < 0 {
-		return 0
-	}
-	return d
-}
-
-var testDidRenewLoop = func(next time.Duration, err error) {}
diff --git a/vendor/golang.org/x/crypto/acme/autocert/renewal_test.go b/vendor/golang.org/x/crypto/acme/autocert/renewal_test.go
deleted file mode 100644
index f232619..0000000
--- a/vendor/golang.org/x/crypto/acme/autocert/renewal_test.go
+++ /dev/null
@@ -1,191 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package autocert
-
-import (
-	"context"
-	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/base64"
-	"fmt"
-	"net/http"
-	"net/http/httptest"
-	"testing"
-	"time"
-
-	"golang.org/x/crypto/acme"
-)
-
-func TestRenewalNext(t *testing.T) {
-	now := time.Now()
-	timeNow = func() time.Time { return now }
-	defer func() { timeNow = time.Now }()
-
-	man := &Manager{RenewBefore: 7 * 24 * time.Hour}
-	defer man.stopRenew()
-	tt := []struct {
-		expiry   time.Time
-		min, max time.Duration
-	}{
-		{now.Add(90 * 24 * time.Hour), 83*24*time.Hour - renewJitter, 83 * 24 * time.Hour},
-		{now.Add(time.Hour), 0, 1},
-		{now, 0, 1},
-		{now.Add(-time.Hour), 0, 1},
-	}
-
-	dr := &domainRenewal{m: man}
-	for i, test := range tt {
-		next := dr.next(test.expiry)
-		if next < test.min || test.max < next {
-			t.Errorf("%d: next = %v; want between %v and %v", i, next, test.min, test.max)
-		}
-	}
-}
-
-func TestRenewFromCache(t *testing.T) {
-	const domain = "example.org"
-
-	// ACME CA server stub
-	var ca *httptest.Server
-	ca = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.Header().Set("replay-nonce", "nonce")
-		if r.Method == "HEAD" {
-			// a nonce request
-			return
-		}
-
-		switch r.URL.Path {
-		// discovery
-		case "/":
-			if err := discoTmpl.Execute(w, ca.URL); err != nil {
-				t.Fatalf("discoTmpl: %v", err)
-			}
-		// client key registration
-		case "/new-reg":
-			w.Write([]byte("{}"))
-		// domain authorization
-		case "/new-authz":
-			w.Header().Set("location", ca.URL+"/authz/1")
-			w.WriteHeader(http.StatusCreated)
-			w.Write([]byte(`{"status": "valid"}`))
-		// cert request
-		case "/new-cert":
-			var req struct {
-				CSR string `json:"csr"`
-			}
-			decodePayload(&req, r.Body)
-			b, _ := base64.RawURLEncoding.DecodeString(req.CSR)
-			csr, err := x509.ParseCertificateRequest(b)
-			if err != nil {
-				t.Fatalf("new-cert: CSR: %v", err)
-			}
-			der, err := dummyCert(csr.PublicKey, domain)
-			if err != nil {
-				t.Fatalf("new-cert: dummyCert: %v", err)
-			}
-			chainUp := fmt.Sprintf("<%s/ca-cert>; rel=up", ca.URL)
-			w.Header().Set("link", chainUp)
-			w.WriteHeader(http.StatusCreated)
-			w.Write(der)
-		// CA chain cert
-		case "/ca-cert":
-			der, err := dummyCert(nil, "ca")
-			if err != nil {
-				t.Fatalf("ca-cert: dummyCert: %v", err)
-			}
-			w.Write(der)
-		default:
-			t.Errorf("unrecognized r.URL.Path: %s", r.URL.Path)
-		}
-	}))
-	defer ca.Close()
-
-	// use EC key to run faster on 386
-	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	if err != nil {
-		t.Fatal(err)
-	}
-	man := &Manager{
-		Prompt:      AcceptTOS,
-		Cache:       newMemCache(),
-		RenewBefore: 24 * time.Hour,
-		Client: &acme.Client{
-			Key:          key,
-			DirectoryURL: ca.URL,
-		},
-	}
-	defer man.stopRenew()
-
-	// cache an almost expired cert
-	now := time.Now()
-	cert, err := dateDummyCert(key.Public(), now.Add(-2*time.Hour), now.Add(time.Minute), domain)
-	if err != nil {
-		t.Fatal(err)
-	}
-	tlscert := &tls.Certificate{PrivateKey: key, Certificate: [][]byte{cert}}
-	if err := man.cachePut(context.Background(), domain, tlscert); err != nil {
-		t.Fatal(err)
-	}
-
-	// veriy the renewal happened
-	defer func() {
-		testDidRenewLoop = func(next time.Duration, err error) {}
-	}()
-	done := make(chan struct{})
-	testDidRenewLoop = func(next time.Duration, err error) {
-		defer close(done)
-		if err != nil {
-			t.Errorf("testDidRenewLoop: %v", err)
-		}
-		// Next should be about 90 days:
-		// dummyCert creates 90days expiry + account for man.RenewBefore.
-		// Previous expiration was within 1 min.
-		future := 88 * 24 * time.Hour
-		if next < future {
-			t.Errorf("testDidRenewLoop: next = %v; want >= %v", next, future)
-		}
-
-		// ensure the new cert is cached
-		after := time.Now().Add(future)
-		tlscert, err := man.cacheGet(context.Background(), domain)
-		if err != nil {
-			t.Fatalf("man.cacheGet: %v", err)
-		}
-		if !tlscert.Leaf.NotAfter.After(after) {
-			t.Errorf("cache leaf.NotAfter = %v; want > %v", tlscert.Leaf.NotAfter, after)
-		}
-
-		// verify the old cert is also replaced in memory
-		man.stateMu.Lock()
-		defer man.stateMu.Unlock()
-		s := man.state[domain]
-		if s == nil {
-			t.Fatalf("m.state[%q] is nil", domain)
-		}
-		tlscert, err = s.tlscert()
-		if err != nil {
-			t.Fatalf("s.tlscert: %v", err)
-		}
-		if !tlscert.Leaf.NotAfter.After(after) {
-			t.Errorf("state leaf.NotAfter = %v; want > %v", tlscert.Leaf.NotAfter, after)
-		}
-	}
-
-	// trigger renew
-	hello := &tls.ClientHelloInfo{ServerName: domain}
-	if _, err := man.GetCertificate(hello); err != nil {
-		t.Fatal(err)
-	}
-
-	// wait for renew loop
-	select {
-	case <-time.After(10 * time.Second):
-		t.Fatal("renew took too long to occur")
-	case <-done:
-	}
-}