sender.go

Documentation: github.com/Azure/go-autorest/autorest/adal

     1  package adal
     2  
     3  // Copyright 2017 Microsoft Corporation
     4  //
     5  //  Licensed under the Apache License, Version 2.0 (the "License");
     6  //  you may not use this file except in compliance with the License.
     7  //  You may obtain a copy of the License at
     8  //
     9  //      http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  //  Unless required by applicable law or agreed to in writing, software
    12  //  distributed under the License is distributed on an "AS IS" BASIS,
    13  //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14  //  See the License for the specific language governing permissions and
    15  //  limitations under the License.
    16  
    17  import (
    18  	"crypto/tls"
    19  	"net"
    20  	"net/http"
    21  	"net/http/cookiejar"
    22  	"sync"
    23  	"time"
    24  
    25  	"github.com/Azure/go-autorest/tracing"
    26  )
    27  
    28  const (
    29  	contentType      = "Content-Type"
    30  	mimeTypeFormPost = "application/x-www-form-urlencoded"
    31  )
    32  
    33  // DO NOT ACCESS THIS DIRECTLY.  go through sender()
    34  var defaultSender Sender
    35  var defaultSenderInit = &sync.Once{}
    36  
    37  // Sender is the interface that wraps the Do method to send HTTP requests.
    38  //
    39  // The standard http.Client conforms to this interface.
    40  type Sender interface {
    41  	Do(*http.Request) (*http.Response, error)
    42  }
    43  
    44  // SenderFunc is a method that implements the Sender interface.
    45  type SenderFunc func(*http.Request) (*http.Response, error)
    46  
    47  // Do implements the Sender interface on SenderFunc.
    48  func (sf SenderFunc) Do(r *http.Request) (*http.Response, error) {
    49  	return sf(r)
    50  }
    51  
    52  // SendDecorator takes and possibly decorates, by wrapping, a Sender. Decorators may affect the
    53  // http.Request and pass it along or, first, pass the http.Request along then react to the
    54  // http.Response result.
    55  type SendDecorator func(Sender) Sender
    56  
    57  // CreateSender creates, decorates, and returns, as a Sender, the default http.Client.
    58  func CreateSender(decorators ...SendDecorator) Sender {
    59  	return DecorateSender(sender(), decorators...)
    60  }
    61  
    62  // DecorateSender accepts a Sender and a, possibly empty, set of SendDecorators, which is applies to
    63  // the Sender. Decorators are applied in the order received, but their affect upon the request
    64  // depends on whether they are a pre-decorator (change the http.Request and then pass it along) or a
    65  // post-decorator (pass the http.Request along and react to the results in http.Response).
    66  func DecorateSender(s Sender, decorators ...SendDecorator) Sender {
    67  	for _, decorate := range decorators {
    68  		s = decorate(s)
    69  	}
    70  	return s
    71  }
    72  
    73  func sender() Sender {
    74  	// note that we can't init defaultSender in init() since it will
    75  	// execute before calling code has had a chance to enable tracing
    76  	defaultSenderInit.Do(func() {
    77  		// copied from http.DefaultTransport with a TLS minimum version.
    78  		transport := &http.Transport{
    79  			Proxy: http.ProxyFromEnvironment,
    80  			DialContext: (&net.Dialer{
    81  				Timeout:   30 * time.Second,
    82  				KeepAlive: 30 * time.Second,
    83  			}).DialContext,
    84  			ForceAttemptHTTP2:     true,
    85  			MaxIdleConns:          100,
    86  			IdleConnTimeout:       90 * time.Second,
    87  			TLSHandshakeTimeout:   10 * time.Second,
    88  			ExpectContinueTimeout: 1 * time.Second,
    89  			TLSClientConfig: &tls.Config{
    90  				MinVersion: tls.VersionTLS12,
    91  			},
    92  		}
    93  		var roundTripper http.RoundTripper = transport
    94  		if tracing.IsEnabled() {
    95  			roundTripper = tracing.NewTransport(transport)
    96  		}
    97  		j, _ := cookiejar.New(nil)
    98  		defaultSender = &http.Client{Jar: j, Transport: roundTripper}
    99  	})
   100  	return defaultSender
   101  }
   102
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