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/*
* MinIO Cloud Storage, (C) 2016-2020 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
10BC8
*
* 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 madmin
import (
"bytes"
"context"
"encoding/hex"
"errors"
"fmt"
"io"
"io/ioutil"
"math/rand"
"net/http"
"net/http/cookiejar"
"net/http/httputil"
"net/url"
"os"
"regexp"
"runtime"
"strings"
"time"
"github.com/minio/minio-go/v7/pkg/credentials"
"github.com/minio/minio-go/v7/pkg/s3utils"
"github.com/minio/minio-go/v7/pkg/signer"
"golang.org/x/net/publicsuffix"
)
// AdminClient implements Amazon S3 compatible methods.
type AdminClient struct {
/// Standard options.
// Parsed endpoint url provided by the user.
endpointURL *url.URL
// Holds various credential providers.
credsProvider *credentials.Credentials
// User supplied.
appInfo struct {
appName string
appVersion string
}
// Indicate whether we are using https or not
secure bool
// Needs allocation.
httpClient *http.Client
random *rand.Rand
// Advanced functionality.
isTraceEnabled bool
traceOutput io.Writer
}
// Global constants.
const (
libraryName = "madmin-go"
libraryVersion = "0.0.1"
libraryAdminURLPrefix = "/minio/admin"
)
// User Agent should always following the below style.
// Please open an issue to discuss any new changes here.
//
// MinIO (OS; ARCH) LIB/VER APP/VER
const (
libraryUserAgentPrefix = "MinIO (" + runtime.GOOS + "; " + runtime.GOARCH + ") "
libraryUserAgent = libraryUserAgentPrefix + libraryName + "/" + libraryVersion
)
// Options for New method
type Options struct {
Creds *credentials.Credentials
Secure bool
// Add future fields here
}
// New - instantiate minio admin client
func New(endpoint string, accessKeyID, secretAccessKey string, secure bool) (*AdminClient, error) {
creds := credentials.NewStaticV4(accessKeyID, secretAccessKey, "")
clnt, err := privateNew(endpoint, creds, secure)
if err != nil {
return nil, err
}
return clnt, nil
}
// NewWithOptions - instantiate minio admin client with options.
func NewWithOptions(endpoint string, opts *Options) (*AdminClient, error) {
clnt, err := privateNew(endpoint, opts.Creds, opts.Secure)
if err != nil {
return nil, err
}
return clnt, nil
}
func privateNew(endpoint string, creds *credentials.Credentials, secure bool) (*AdminClient, error) {
// Initialize cookies to preserve server sent cookies if any and replay
// them upon each request.
jar, err := cookiejar.New(&cookiejar.Options{PublicSuffixList: publicsuffix.List})
if err != nil {
return nil, err
}
// construct endpoint.
endpointURL, err := getEndpointURL(endpoint, secure)
if err != nil {
return nil, err
}
clnt := new(AdminClient)
// Save the credentials.
clnt.credsProvider = creds
// Remember whether we are using https or not
clnt.secure = secure
// Save endpoint URL, user agent for future uses.
clnt.endpointURL = endpointURL
// Instantiate http client and bucket location cache.
clnt.httpClient = &http.Client{
Jar: jar,
Transport: DefaultTransport(secure),
}
// Add locked pseudo-random number generator.
clnt.random = rand.New(&lockedRandSource{src: rand.NewSource(time.Now().UTC().UnixNano())})
// Return.
return clnt, nil
}
// SetAppInfo - add application details to user agent.
func (adm *AdminClient) SetAppInfo(appName string, appVersion string) {
// if app name and version is not set, we do not a new user
// agent.
if appName != "" && appVersion != "" {
adm.appInfo.appName = appName
adm.appInfo.appVersion = appVersion
}
}
// SetCustomTransport - set new custom transport.
func (adm *AdminClient) SetCustomTransport(customHTTPTransport http.RoundTripper) {
// Set this to override default transport
// ``http.DefaultTransport``.
//
// This transport is usually needed for debugging OR to add your
// own custom TLS certificates on the client transport, for custom
// CA's and certs which are not part of standard certificate
// authority follow this example :-
//
// tr := &http.Transport{
// TLSClientConfig: &tls.Config{RootCAs: pool},
// DisableCompression: true,
// }
// api.SetTransport(tr)
//
if adm.httpClient != nil {
adm.httpClient.Transport = customHTTPTransport
}
}
// TraceOn - enable HTTP tracing.
func (adm *AdminClient) TraceOn(outputStream io.Writer) {
// if outputStream is nil then default to os.Stdout.
if outputStream == nil {
outputStream = os.Stdout
}
// Sets a new output stream.
adm.traceOutput = outputStream
// Enable tracing.
adm.isTraceEnabled = true
}
// TraceOff - disable HTTP tracing.
func (adm *AdminClient) TraceOff() {
// Disable tracing.
adm.isTraceEnabled = false
}
// requestMetadata - is container for all the values to make a
// request.
type requestData struct {
customHeaders http.Header
queryValues url.Values
relPath string // URL path relative to admin API base endpoint
content []byte
}
// Filter out signature value from Authorization header.
func (adm AdminClient) filterSignature(req *http.Request) {
/// Signature V4 authorization header.
// Save the original auth.
origAuth := req.Header.Get("Authorization")
// Strip out accessKeyID from:
// Credential=<access-key-id>/<date>/<aws-region>/<aws-service>/aws4_request
regCred := regexp.MustCompile("Credential=([A-Z0-9]+)/")
newAuth := regCred.ReplaceAllString(origAuth, "Credential=**REDACTED**/")
// Strip out 256-bit signature from: Signature=<256-bit signature>
regSign := regexp.MustCompile("Signature=([[0-9a-f]+)")
newAuth = regSign.ReplaceAllString(newAuth, "Signature=**REDACTED**")
// Set a temporary redacted auth
req.Header.Set("Authorization", newAuth)
}
// dumpHTTP - dump HTTP request and response.
func (adm AdminClient) dumpHTTP(req *http.Request, resp *http.Response) error {
// Starts http dump.
_, err := fmt.Fprintln(adm.traceOutput, "---------START-HTTP---------")
if err != nil {
return err
}
// Filter out Signature field from Authorization header.
adm.filterSignature(req)
// Only display request header.
reqTrace, err := httputil.DumpRequestOut(req, false)
if err != nil {
return err
}
// Write request to trace output.
_, err = fmt.Fprint(adm.traceOutput, string(reqTrace))
if err != nil {
return err
}
// Only display response header.
var respTrace []byte
// For errors we make sure to dump response body as well.
if resp.StatusCode != http.StatusOK &&
resp.StatusCode != http.StatusPartialContent &&
resp.StatusCode != http.StatusNoContent {
respTrace, err = httputil.DumpResponse(resp, true)
if err != nil {
return err
}
} else {
// WORKAROUND for https://github.com/golang/go/issues/13942.
// httputil.DumpResponse does not print response headers for
// all successful calls which have response ContentLength set
// to zero. Keep this workaround until the above bug is fixed.
if resp.ContentLength == 0 {
var buffer bytes.Buffer
if err = resp.Header.Write(&buffer); err != nil {
return err
}
respTrace = buffer.Bytes()
respTrace = append(respTrace, []byte("\r\n")...)
} else {
respTrace, err = httputil.DumpResponse(resp, false)
if err != nil {
return err
}
}
}
// Write response to trace output.
_, err = fmt.Fprint(adm.traceOutput, strings.TrimSuffix(string(respTrace), "\r\n"))
if err != nil {
return err
}
// Ends the http dump.
_, err = fmt.Fprintln(adm.traceOutput, "---------END-HTTP---------")
return err
}
// do - execute http request.
func (adm AdminClient) do(req *http.Request) (*http.Response, error) {
resp, err := adm.httpClient.Do(req)
if err != nil {
// Handle this specifically for now until future Golang versions fix this issue properly.
if urlErr, ok := err.(*url.Error); ok {
if strings.Contains(urlErr.Err.Error(), "EOF") {
return nil, &url.Error{
Op: urlErr.Op,
URL: urlErr.URL,
Err: errors.New("Connection closed by foreign host " + urlErr.URL + ". Retry again."),
}
}
}
return nil, err
}
// Response cannot be non-nil, report if its the case.
if resp == nil {
msg := "Response is empty. " // + reportIssue
return nil, ErrInvalidArgument(msg)
}
// If trace is enabled, dump http request and response.
if adm.isTraceEnabled {
err = adm.dumpHTTP(req, resp)
if err != nil {
return nil, err
}
}
return resp, nil
}
// List of success status.
var successStatus = []int{
http.StatusOK,
http.StatusNoContent,
http.StatusPartialContent,
}
// executeMethod - instantiates a given method, and retries the
// request upon any error up to maxRetries attempts in a binomially
// delayed manner using a standard back off algorithm.
func (adm AdminClient) executeMethod(ctx context.Context, method string, reqData requestData) (res *http.Response, err error) {
var reqRetry = MaxRetry // Indicates how many times we can retry the request
defer func() {
if err != nil {
// close idle connections before returning, upon error.
adm.httpClient.CloseIdleConnections()
}
}()
// Create cancel context to control 'newRetryTimer' go routine.
retryCtx, cancel := context.WithCancel(ctx)
// Indicate to our routine to exit cleanly upon return.
defer cancel()
for range adm.newRetryTimer(retryCtx, reqRetry, DefaultRetryUnit, DefaultRetryCap, MaxJitter) {
// Instantiate a new request.
var req *http.Request
req, err = adm.newRequest(ctx, method, reqData)
if err != nil {
return nil, err
}
// Initiate the request.
res, err = adm.do(req)
if err != nil {
if err == context.Canceled || err == context.DeadlineExceeded {
return nil, err
}
// retry all network errors.
continue
}
// For any known successful http status, return quickly.
for _, httpStatus := range successStatus {
if httpStatus == res.StatusCode {
return res, nil
}
}
// Read the body to be saved later.
errBodyBytes, err := ioutil.ReadAll(res.Body)
// res.Body should be closed
closeResponse(res)
if err != nil {
return nil, err
}
// Save the body.
errBodySeeker := bytes.NewReader(errBodyBytes)
res.Body = ioutil.NopCloser(errBodySeeker)
// For errors verify if its retryable otherwise fail quickly.
errResponse := ToErrorResponse(httpRespToErrorResponse(res))
// Save the body back again.
errBodySeeker.Seek(0, 0) // Seek back to starting point.
res.Body = ioutil.NopCloser(errBodySeeker)
// Verify if error response code is retryable.
if isS3CodeRetryable(errResponse.Code) {
continue // Retry.
}
// Verify if http status code is retryable.
if isHTTPStatusRetryable(res.StatusCode) {
continue // Retry.
}
break
}
// Return an error when retry is canceled or deadlined
if e := retryCtx.Err(); e != nil {
return nil, e
}
return res, err
}
// set User agent.
func (adm AdminClient) setUserAgent(req *http.Request) {
req.Header.Set("User-Agent", libraryUserAgent)
if adm.appInfo.appName != "" && adm.appInfo.appVersion != "" {
req.Header.Set("User-Agent", libraryUserAgent+" "+adm.appInfo.appName+"/"+adm.appInfo.appVersion)
}
}
func (adm AdminClient) getSecretKey() string {
value, err := adm.credsProvider.Get()
if err != nil {
// Return empty, call will fail.
return ""
}
return value.SecretAccessKey
}
// newRequest - instantiate a new HTTP request for a given method.
func (adm AdminClient) newRequest(ctx context.Context, method string, reqData requestData) (req *http.Request, err error) {
// If no method is supplied default to 'POST'.
if method == "" {
method = "POST"
}
// Default all requests to ""
location := ""
// Construct a new target URL.
targetURL, err := adm.makeTargetURL(reqData)
if err != nil {
return nil, err
}
// Initialize a new HTTP request for the method.
req, err = http.NewRequestWithContext(ctx, method, targetURL.String(), nil)
if err != nil {
return nil, err
}
value, err := adm.credsProvider.Get()
if err != nil {
return nil, err
}
var (
accessKeyID = value.AccessKeyID
secretAccessKey = value.SecretAccessKey
sessionToken = value.SessionToken
)
adm.setUserAgent(req)
for k, v := range reqData.customHeaders {
req.Header.Set(k, v[0])
}
if length := len(reqData.content); length > 0 {
req.ContentLength = int64(length)
}
req.Header.Set("X-Amz-Content-Sha256", hex.EncodeToString(sum256(reqData.content)))
req.Body = ioutil.NopCloser(bytes.NewReader(reqData.content))
req = signer.SignV4(*req, accessKeyID, secretAccessKey, sessionToken, location)
return req, nil
}
// makeTargetURL make a new target url.
func (adm AdminClient) makeTargetURL(r requestData) (*url.URL, error) {
host := adm.endpointURL.Host
scheme := adm.endpointURL.Scheme
urlStr := scheme + "://" + host + libraryAdminURLPrefix + r.relPath
// If there are any query values, add them to the end.
if len(r.queryValues) > 0 {
urlStr = urlStr + "?" + s3utils.QueryEncode(r.queryValues)
}
u, err := url.Parse(urlStr)
if err != nil {
return nil, err
}
return u, nil
}