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/*
* Minio Cloud Storage, (C) 2016, 2017 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 madmin
import (
"bytes"
"encoding/base64"
"encoding/hex"
"fmt"
"io"
"io/ioutil"
"math/rand"
"net/http"
"net/http/httputil"
"net/url"
"os"
"regexp"
"runtime"
"strings"
"github.com/minio/minio-go/pkg/s3signer"
"github.com/minio/minio-go/pkg/s3utils"
)
// AdminClient implements Amazon S3 compatible methods.
type AdminClient struct {
/// Standard options.
// AccessKeyID required for authorized requests.
accessKeyID string
// SecretAccessKey required for authorized requests.
secretAccessKey string
// User supplied.
appInfo struct {
appName string
appVersion string
}
endpointURL url.URL
// Indicate whether we are using https or not
secure bool
// Needs allocation.
httpClient *http.Client
// Advanced functionality.
isTraceEnabled bool
traceOutput io.Writer
// Random seed.
random *rand.Rand
}
// Global constants.
const (
libraryName = "madmin-go"
libraryVersion = "0.0.1"
)
// 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
)
// New - instantiate minio client Client, adds automatic verification of signature.
func New(endpoint string, accessKeyID, secretAccessKey string, secure bool) (*AdminClient, error) {
clnt, err := privateNew(endpoint, accessKeyID, secretAccessKey, secure)
if err != nil {
return nil, err
}
return clnt, nil
}
// redirectHeaders copies all headers when following a redirect URL.
// This won't be needed anymore from go 1.8 (https://github.com/golang/go/issues/4800)
func redirectHeaders(req *http.Request, via []*http.Request) error {
if len(via) == 0 {
return nil
}
for key, val := range via[0].Header {
req.Header[key] = val
}
return nil
}
func privateNew(endpoint, accessKeyID, secretAccessKey string, secure bool) (*AdminClient, error) {
// construct endpoint.
endpointURL, err := getEndpointURL(endpoint, secure)
if err != nil {
return nil, err
}
// instantiate new Client.
clnt := &AdminClient{
accessKeyID: accessKeyID,
secretAccessKey: secretAccessKey,
// Remember whether we are using https or not
secure: secure,
// Save endpoint URL, user agent for future uses.
endpointURL: *endpointURL,
// Instantiate http client and bucket location cache.
httpClient: &http.Client{
Transport: http.DefaultTransport,
CheckRedirect: redirectHeaders,
},
}
// Return.
return clnt, nil
}
// SetAppInfo - add application details to user agent.
func (c *AdminClient) SetAppInfo(appName string, appVersion string) {
// if app name and version is not set, we do not a new user
// agent.
if appName != "" && appVersion != "" {
c.appInfo = struct {
appName string
appVersion string
}{}
c.appInfo.appName = appName
c.appInfo.appVersion = appVersion
}
}
// SetCustomTransport - set new custom transport.
func (c *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 c.httpClient != nil {
c.httpClient.Transport = customHTTPTransport
}
}
// TraceOn - enable HTTP tracing.
func (c *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.
c.traceOutput = outputStream
// Enable tracing.
c.isTraceEnabled = true
}
// TraceOff - disable HTTP tracing.
func (c *AdminClient) TraceOff() {
// Disable tracing.
c.isTraceEnabled = false
}
// requestMetadata - is container for all the values to make a
// request.
type requestData struct {
customHeaders http.Header
queryValues url.Values
contentBody io.Reader
contentLength int64
contentSHA256Bytes []byte
contentMD5Bytes []byte
}
// Filter out signature value from Authorization header.
func (c 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)
return
}
// dumpHTTP - dump HTTP request and response.
func (c AdminClient) dumpHTTP(req *http.Request, resp *http.Response) error {
// Starts http dump.
_, err := fmt.Fprintln(c.traceOutput, "---------START-HTTP---------")
if err != nil {
return err
}
// Filter out Signature field from Authorization header.
c.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(c.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(c.traceOutput, strings.TrimSuffix(string(respTrace), "\r\n"))
if err != nil {
return err
}
// Ends the http dump.
_, err = fmt.Fprintln(c.traceOutput, "---------END-HTTP---------")
return err
}
// do - execute http request.
func (c AdminClient) do(req *http.Request) (*http.Response, error) {
var resp *http.Response
var err error
// Do the request in a loop in case of 307 http is met since golang still doesn't
// handle properly this situation (https://github.com/golang/go/issues/7912)
for {
resp, err = c.httpClient.Do(req)
if err != nil {
// Handle this specifically for now until future Golang
// versions fix this issue properly.
urlErr, ok := err.(*url.Error)
if ok && strings.Contains(urlErr.Err.Error(), "EOF") {
return nil, &url.Error{
Op: urlErr.Op,
URL: urlErr.URL,
Err: fmt.Errorf("Connection closed by foreign host %s", urlErr.URL),
}
}
return nil, err
}
// Redo the request with the new redirect url if http 307 is returned, quit the loop otherwise
if resp != nil && resp.StatusCode == http.StatusTemporaryRedirect {
newURL, uErr := url.Parse(resp.Header.Get("Location"))
if uErr != nil {
break
}
req.URL = newURL
} else {
break
}
}
// 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 c.isTraceEnabled {
err = c.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 (c AdminClient) executeMethod(method string, reqData requestData) (res *http.Response, err error) {
// Create a done channel to control 'ListObjects' go routine.
doneCh := make(chan struct{}, 1)
// Indicate to our routine to exit cleanly upon return.
defer close(doneCh)
// Instantiate a new request.
var req *http.Request
req, err = c.newRequest(method, reqData)
if err != nil {
return nil, err
}
// Initiate the request.
res, err = c.do(req)
if err != nil {
return nil, err
}
// 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)
if err != nil {
return nil, err
}
// Save the body.
errBodySeeker := bytes.NewReader(errBodyBytes)
res.Body = ioutil.NopCloser(errBodySeeker)
// Save the body back again.
errBodySeeker.Seek(0, 0) // Seek back to starting point.
res.Body = ioutil.NopCloser(errBodySeeker)
return res, err
}
// set User agent.
func (c AdminClient) setUserAgent(req *http.Request) {
req.Header.Set("User-Agent", libraryUserAgent)
if c.appInfo.appName != "" && c.appInfo.appVersion != "" {
req.Header.Set("User-Agent", libraryUserAgent+" "+c.appInfo.appName+"/"+c.appInfo.appVersion)
}
}
// newRequest - instantiate a new HTTP request for a given method.
func (c AdminClient) newRequest(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 "us-east-1"
location := "us-east-1"
// Construct a new target URL.
targetURL, err := c.makeTargetURL(reqData.queryValues)
if err != nil {
return nil, err
}
// Initialize a new HTTP request for the method.
req, err = http.NewRequest(method, targetURL.String(), nil)
if err != nil {
return nil, err
}
// Set content body if available.
if reqData.contentBody != nil {
req.Body = ioutil.NopCloser(reqData.contentBody)
}
// Set 'User-Agent' header for the request.
c.setUserAgent(req)
// Set all headers.
for k, v := range reqData.customHeaders {
req.Header.Set(k, v[0])
}
// set incoming content-length.
if reqData.contentLength > 0 {
req.ContentLength = reqData.contentLength
}
shaHeader := unsignedPayload
if !c.secure {
if reqData.contentSHA256Bytes == nil {
shaHeader = hex.EncodeToString(sum256([]byte{}))
} else {
shaHeader = hex.EncodeToString(reqData.contentSHA256Bytes)
}
}
req.Header.Set("X-Amz-Content-Sha256", shaHeader)
// set md5Sum for content protection.
if reqData.contentMD5Bytes != nil {
req.Header.Set("Content-Md5", base64.StdEncoding.EncodeToString(reqData.contentMD5Bytes))
}
// Add signature version '4' authorization header.
req = s3signer.SignV4(*req, c.accessKeyID, c.secretAccessKey, "", location)
// Return request.
return req, nil
}
// makeTargetURL make a new target url.
func (c AdminClient) makeTargetURL(queryValues url.Values) (*url.URL, error) {
host := c.endpointURL.Host
scheme := c.endpointURL.Scheme
urlStr := scheme + "://" + host + "/"
// If there are any query values, add them to the end.
if len(queryValues) > 0 {
urlStr = urlStr + "?" + s3utils.QueryEncode(queryValues)
}
u, err := url.Parse(urlStr)
if err != nil {
return nil, err
}
return u, nil
}