github.com/azure-devops-engineer/helm@v3.0.0-alpha.2+incompatible/pkg/getter/httpgetter.go (about)

     1  /*
     2  Copyright The Helm Authors.
     3  Licensed under the Apache License, Version 2.0 (the "License");
     4  you may not use this file except in compliance with the License.
     5  You may obtain a copy of the License at
     6  
     7  http://www.apache.org/licenses/LICENSE-2.0
     8  
     9  Unless required by applicable law or agreed to in writing, software
    10  distributed under the License is distributed on an "AS IS" BASIS,
    11  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  See the License for the specific language governing permissions and
    13  limitations under the License.
    14  */
    15  
    16  package getter
    17  
    18  import (
    19  	"bytes"
    20  	"io"
    21  	"net/http"
    22  
    23  	"github.com/pkg/errors"
    24  
    25  	"helm.sh/helm/pkg/tlsutil"
    26  	"helm.sh/helm/pkg/urlutil"
    27  )
    28  
    29  // HTTPGetter is the efault HTTP(/S) backend handler
    30  type HTTPGetter struct {
    31  	client *http.Client
    32  	opts   options
    33  }
    34  
    35  //Get performs a Get from repo.Getter and returns the body.
    36  func (g *HTTPGetter) Get(href string) (*bytes.Buffer, error) {
    37  	return g.get(href)
    38  }
    39  
    40  func (g *HTTPGetter) get(href string) (*bytes.Buffer, error) {
    41  	buf := bytes.NewBuffer(nil)
    42  
    43  	// Set a helm specific user agent so that a repo server and metrics can
    44  	// separate helm calls from other tools interacting with repos.
    45  	req, err := http.NewRequest("GET", href, nil)
    46  	if err != nil {
    47  		return buf, err
    48  	}
    49  	// req.Header.Set("User-Agent", "Helm/"+strings.TrimPrefix(version.GetVersion(), "v"))
    50  	if g.opts.userAgent != "" {
    51  		req.Header.Set("User-Agent", g.opts.userAgent)
    52  	}
    53  
    54  	if g.opts.username != "" && g.opts.password != "" {
    55  		req.SetBasicAuth(g.opts.username, g.opts.password)
    56  	}
    57  
    58  	resp, err := g.client.Do(req)
    59  	if err != nil {
    60  		return buf, err
    61  	}
    62  	if resp.StatusCode != 200 {
    63  		return buf, errors.Errorf("failed to fetch %s : %s", href, resp.Status)
    64  	}
    65  
    66  	_, err = io.Copy(buf, resp.Body)
    67  	resp.Body.Close()
    68  	return buf, err
    69  }
    70  
    71  // NewHTTPGetter constructs a valid http/https client as a Getter
    72  func NewHTTPGetter(options ...Option) (Getter, error) {
    73  	var client HTTPGetter
    74  
    75  	for _, opt := range options {
    76  		opt(&client.opts)
    77  	}
    78  
    79  	if client.opts.certFile != "" && client.opts.keyFile != "" {
    80  		tlsConf, err := tlsutil.NewClientTLS(client.opts.certFile, client.opts.keyFile, client.opts.caFile)
    81  		if err != nil {
    82  			return &client, errors.Wrap(err, "can't create TLS config for client")
    83  		}
    84  		tlsConf.BuildNameToCertificate()
    85  
    86  		sni, err := urlutil.ExtractHostname(client.opts.url)
    87  		if err != nil {
    88  			return &client, err
    89  		}
    90  		tlsConf.ServerName = sni
    91  
    92  		client.client = &http.Client{
    93  			Transport: &http.Transport{
    94  				TLSClientConfig: tlsConf,
    95  				Proxy:           http.ProxyFromEnvironment,
    96  			},
    97  		}
    98  	} else {
    99  		client.client = http.DefaultClient
   100  	}
   101  
   102  	return &client, nil
   103  }