github.com/minio/minio-go/v6@v6.0.57/transport.go (about)

     1  // +build go1.7 go1.8
     2  
     3  /*
     4   * MinIO Go Library for Amazon S3 Compatible Cloud Storage
     5   * Copyright 2017-2018 MinIO, Inc.
     6   *
     7   * Licensed under the Apache License, Version 2.0 (the "License");
     8   * you may not use this file except in compliance with the License.
     9   * You may obtain a copy of the License at
    10   *
    11   *     http://www.apache.org/licenses/LICENSE-2.0
    12   *
    13   * Unless required by applicable law or agreed to in writing, software
    14   * distributed under the License is distributed on an "AS IS" BASIS,
    15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    16   * See the License for the specific language governing permissions and
    17   * limitations under the License.
    18   */
    19  
    20  package minio
    21  
    22  import (
    23  	"crypto/tls"
    24  	"crypto/x509"
    25  	"io/ioutil"
    26  	"net"
    27  	"net/http"
    28  	"os"
    29  	"time"
    30  )
    31  
    32  // mustGetSystemCertPool - return system CAs or empty pool in case of error (or windows)
    33  func mustGetSystemCertPool() *x509.CertPool {
    34  	pool, err := x509.SystemCertPool()
    35  	if err != nil {
    36  		return x509.NewCertPool()
    37  	}
    38  	return pool
    39  }
    40  
    41  // DefaultTransport - this default transport is similar to
    42  // http.DefaultTransport but with additional param  DisableCompression
    43  // is set to true to avoid decompressing content with 'gzip' encoding.
    44  var DefaultTransport = func(secure bool) (http.RoundTripper, error) {
    45  	tr := &http.Transport{
    46  		Proxy: http.ProxyFromEnvironment,
    47  		DialContext: (&net.Dialer{
    48  			Timeout:   30 * time.Second,
    49  			KeepAlive: 30 * time.Second,
    50  		}).DialContext,
    51  		MaxIdleConns:          256,
    52  		MaxIdleConnsPerHost:   16,
    53  		ResponseHeaderTimeout: time.Minute,
    54  		IdleConnTimeout:       time.Minute,
    55  		TLSHandshakeTimeout:   10 * time.Second,
    56  		ExpectContinueTimeout: 10 * time.Second,
    57  		// Set this value so that the underlying transport round-tripper
    58  		// doesn't try to auto decode the body of objects with
    59  		// content-encoding set to `gzip`.
    60  		//
    61  		// Refer:
    62  		//    https://golang.org/src/net/http/transport.go?h=roundTrip#L1843
    63  		DisableCompression: true,
    64  	}
    65  
    66  	if secure {
    67  		tr.TLSClientConfig = &tls.Config{
    68  			// Can't use SSLv3 because of POODLE and BEAST
    69  			// Can't use TLSv1.0 because of POODLE and BEAST using CBC cipher
    70  			// Can't use TLSv1.1 because of RC4 cipher usage
    71  			MinVersion: tls.VersionTLS12,
    72  		}
    73  		if f := os.Getenv("SSL_CERT_FILE"); f != "" {
    74  			rootCAs := mustGetSystemCertPool()
    75  			data, err := ioutil.ReadFile(f)
    76  			if err == nil {
    77  				rootCAs.AppendCertsFromPEM(data)
    78  			}
    79  			tr.TLSClientConfig.RootCAs = rootCAs
    80  		}
    81  	}
    82  	return tr, nil
    83  }