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operator_dns.go
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/
operator_dns.go
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/*
* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dns
import (
"context"
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/minio/minio/cmd/config"
xhttp "github.com/minio/minio/cmd/http"
)
var (
defaultOperatorContextTimeout = 10 * time.Second
// ErrNotImplemented - Indicates the functionality which is not implemented
ErrNotImplemented = errors.New("The method is not implemented")
)
func (c *OperatorDNS) addAuthHeader(r *http.Request) error {
if c.username == "" || c.password == "" {
return nil
}
claims := &jwt.StandardClaims{
ExpiresAt: int64(15 * time.Minute),
Issuer: c.username,
Subject: config.EnvDNSWebhook,
}
token := jwt.NewWithClaims(jwt.SigningMethodHS512, claims)
ss, err := token.SignedString([]byte(c.password))
if err != nil {
return err
}
r.Header.Set("Authorization", "Bearer "+ss)
return nil
}
func (c *OperatorDNS) endpoint(bucket string, delete bool) (string, error) {
u, err := url.Parse(c.Endpoint)
if err != nil {
return "", err
}
q := u.Query()
q.Add("bucket", bucket)
q.Add("delete", strconv.FormatBool(delete))
u.RawQuery = q.Encode()
return u.String(), nil
}
// Put - Adds DNS entries into operator webhook server
func (c *OperatorDNS) Put(bucket string) error {
ctx, cancel := context.WithTimeout(context.Background(), defaultOperatorContextTimeout)
defer cancel()
e, err := c.endpoint(bucket, false)
if err != nil {
return newError(bucket, err)
}
req, err := http.NewRequestWithContext(ctx, http.MethodPost, e, nil)
if err != nil {
return newError(bucket, err)
}
if err = c.addAuthHeader(req); err != nil {
return newError(bucket, err)
}
resp, err := c.httpClient.Do(req)
if err != nil {
if derr := c.Delete(bucket); derr != nil {
return newError(bucket, derr)
}
}
var errorStringBuilder strings.Builder
io.Copy(&errorStringBuilder, io.LimitReader(resp.Body, resp.ContentLength))
xhttp.DrainBody(resp.Body)
if resp.StatusCode != http.StatusOK {
errorString := errorStringBuilder.String()
return newError(bucket, fmt.Errorf("service create for bucket %s, failed with status %s, error %s", bucket, resp.Status, errorString))
}
return nil
}
func newError(bucket string, err error) error {
e := Error{bucket, err}
if strings.Contains(err.Error(), "invalid bucket name") {
return ErrInvalidBucketName(e)
}
return e
}
// Delete - Removes DNS entries added in Put().
func (c *OperatorDNS) Delete(bucket string) error {
ctx, cancel := context.WithTimeout(context.Background(), defaultOperatorContextTimeout)
defer cancel()
e, err := c.endpoint(bucket, true)
if err != nil {
return err
}
req, err := http.NewRequestWithContext(ctx, http.MethodPost, e, nil)
if err != nil {
return err
}
if err = c.addAuthHeader(req); err != nil {
return err
}
resp, err := c.httpClient.Do(req)
if err != nil {
return err
}
xhttp.DrainBody(resp.Body)
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("request to delete the service for bucket %s, failed with status %s", bucket, resp.Status)
}
return nil
}
// DeleteRecord - Removes a specific DNS entry
// No Op for Operator because operator deals on with bucket entries
func (c *OperatorDNS) DeleteRecord(record SrvRecord) error {
return ErrNotImplemented
}
// Close closes the internal http client
func (c *OperatorDNS) Close() error {
c.httpClient.CloseIdleConnections()
return nil
}
// List - Retrieves list of DNS entries for the domain.
// This is a No Op for Operator because, there is no intent to enforce global
// namespace at MinIO level with this DNS entry. The global namespace in
// enforced by the Kubernetes Operator
func (c *OperatorDNS) List() (srvRecords map[string][]SrvRecord, err error) {
return nil, ErrNotImplemented
}
// Get - Retrieves DNS records for a bucket.
// This is a No Op for Operator because, there is no intent to enforce global
// namespace at MinIO level with this DNS entry. The global namespace in
// enforced by the Kubernetes Operator
func (c *OperatorDNS) Get(bucket string) (srvRecords []SrvRecord, err error) {
return nil, ErrNotImplemented
}
// String stringer name for this implementation of dns.Store
func (c *OperatorDNS) String() string {
return "webhookDNS"
}
// OperatorDNS - represents dns config for MinIO k8s operator.
type OperatorDNS struct {
httpClient *http.Client
Endpoint string
rootCAs *x509.CertPool
username string
password string
}
// OperatorOption - functional options pattern style for OperatorDNS
type OperatorOption func(*OperatorDNS)
// Authentication - custom username and password for authenticating at the endpoint
func Authentication(username, password string) OperatorOption {
return func(args *OperatorDNS) {
args.username = username
args.password = password
}
}
// RootCAs - add custom trust certs pool
func RootCAs(CAs *x509.CertPool) OperatorOption {
return func(args *OperatorDNS) {
args.rootCAs = CAs
}
}
// NewOperatorDNS - initialize a new K8S Operator DNS set/unset values.
func NewOperatorDNS(endpoint string, setters ...OperatorOption) (Store, error) {
if endpoint == "" {
return nil, errors.New("invalid argument")
}
args := &OperatorDNS{
Endpoint: endpoint,
}
for _, setter := range setters {
setter(args)
}
args.httpClient = &http.Client{
Transport: &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 3 * time.Second,
KeepAlive: 5 * time.Second,
}).DialContext,
ResponseHeaderTimeout: 3 * time.Second,
TLSHandshakeTimeout: 3 * time.Second,
ExpectContinueTimeout: 3 * time.Second,
TLSClientConfig: &tls.Config{
RootCAs: args.rootCAs,
},
// Go net/http automatically unzip if content-type is
// gzip disable this feature, as we are always interested
// in raw stream.
DisableCompression: true,
},
}
return args, nil
}