github.com/meulengracht/snapd@v0.0.0-20210719210640-8bde69bcc84e/overlord/configstate/proxyconf/proxy.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2018 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package proxyconf
    21  
    22  import (
    23  	"fmt"
    24  	"net/http"
    25  	"net/url"
    26  
    27  	"github.com/snapcore/snapd/overlord/configstate/config"
    28  	"github.com/snapcore/snapd/overlord/state"
    29  )
    30  
    31  type ProxySettings struct {
    32  	st *state.State
    33  }
    34  
    35  func New(st *state.State) *ProxySettings {
    36  	return &ProxySettings{st: st}
    37  }
    38  
    39  func (p *ProxySettings) Conf(req *http.Request) (*url.URL, error) {
    40  	p.st.Lock()
    41  	tr := config.NewTransaction(p.st)
    42  	p.st.Unlock()
    43  
    44  	var proxy string
    45  	err := tr.Get("core", fmt.Sprintf("proxy.%s", req.URL.Scheme), &proxy)
    46  	if proxy == "" || config.IsNoOption(err) {
    47  		return http.ProxyFromEnvironment(req)
    48  	}
    49  	if err != nil {
    50  		return nil, err
    51  	}
    52  	url, err := url.Parse(proxy)
    53  	if err != nil {
    54  		return nil, err
    55  	}
    56  	return url, nil
    57  }