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// Copyright 2014 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package proxy
import (
"fmt"
"os"
"strings"
"github.com/juju/utils/set"
)
const (
// Remove the likelihood of errors by mistyping string values.
http_proxy = "http_proxy"
https_proxy = "https_proxy"
ftp_proxy = "ftp_proxy"
no_proxy = "no_proxy"
)
// Settings holds the values for the HTTP, HTTPS and FTP proxies as well as the
// no_proxy value found by Detect Proxies.
// AutoNoProxy is filled with addresses of controllers, we never want to proxy those
type Settings struct {
Http string
Https string
Ftp string
NoProxy string
AutoNoProxy string
}
func getSetting(key string) string {
value := os.Getenv(key)
if value == "" {
value = os.Getenv(strings.ToUpper(key))
}
return value
}
// DetectProxies returns the proxy settings found the environment.
func DetectProxies() Settings {
return Settings{
Http: getSetting(http_proxy),
Https: getSetting(https_proxy),
Ftp: getSetting(ftp_proxy),
NoProxy: getSetting(no_proxy),
}
}
// AsScriptEnvironment returns a potentially multi-line string in a format
// that specifies exported key=value lines. There are two lines for each non-
// empty proxy value, one lower-case and one upper-case.
func (s *Settings) AsScriptEnvironment() string {
var lines []string
addLine := func(proxy, value string) {
if value != "" {
lines = append(
lines,
fmt.Sprintf("export %s=%s", proxy, value),
fmt.Sprintf("export %s=%s", strings.ToUpper(proxy), value))
}
}
addLine(http_proxy, s.Http)
addLine(https_proxy, s.Https)
addLine(ftp_proxy, s.Ftp)
addLine(no_proxy, s.FullNoProxy())
return strings.Join(lines, "\n")
}
// AsEnvironmentValues returns a slice of strings of the format "key=value"
// suitable to be used in a command environment. There are two values for each
// non-empty proxy value, one lower-case and one upper-case.
func (s *Settings) AsEnvironmentValues() []string {
lines := []string{}
addLine := func(proxy, value string) {
if value != "" {
lines = append(
lines,
fmt.Sprintf("%s=%s", proxy, value),
fmt.Sprintf("%s=%s", strings.ToUpper(proxy), value))
}
}
addLine(http_proxy, s.Http)
addLine(https_proxy, s.Https)
addLine(ftp_proxy, s.Ftp)
addLine(no_proxy, s.FullNoProxy())
return lines
}
// AsSystemdEnvSettings returns a string in the format understood by systemd:
// DefaultEnvironment="http_proxy=...." "HTTP_PROXY=..." ...
func (s *Settings) AsSystemdDefaultEnv() string {
lines := s.AsEnvironmentValues()
rv := `# To allow juju to control the global systemd proxy settings,
# create symbolic links to this file from within /etc/systemd/system.conf.d/
# and /etc/systemd/users.conf.d/.
[Manager]
DefaultEnvironment=`
for _, line := range lines {
rv += fmt.Sprintf(`"%s" `, line)
}
return rv + "\n"
}
// SetEnvironmentValues updates the process environment with the
// proxy values stored in the settings object. Both the lower-case
// and upper-case variants are set.
//
// http_proxy, HTTP_PROXY
// https_proxy, HTTPS_PROXY
// ftp_proxy, FTP_PROXY
func (s *Settings) SetEnvironmentValues() {
setenv := func(proxy, value string) {
os.Setenv(proxy, value)
os.Setenv(strings.ToUpper(proxy), value)
}
setenv(http_proxy, s.Http)
setenv(https_proxy, s.Https)
setenv(ftp_proxy, s.Ftp)
setenv(no_proxy, s.FullNoProxy())
}
// FullNoProxy merges NoProxy and AutoNoProxyList
func (s *Settings) FullNoProxy() string {
var allNoProxy []string
if s.NoProxy != "" {
allNoProxy = strings.Split(s.NoProxy, ",")
}
if s.AutoNoProxy != "" {
allNoProxy = append(allNoProxy, strings.Split(s.AutoNoProxy, ",")...)
}
noProxySet := set.NewStrings(allNoProxy...)
return strings.Join(noProxySet.SortedValues(), ",")
}
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