51 lines
1.1 KiB
Go
51 lines
1.1 KiB
Go
package sockets
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import (
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"net"
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"net/url"
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"os"
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"strings"
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"golang.org/x/net/proxy"
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)
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// GetProxyEnv allows access to the uppercase and the lowercase forms of
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// proxy-related variables. See the Go specification for details on these
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// variables. https://golang.org/pkg/net/http/
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func GetProxyEnv(key string) string {
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proxyValue := os.Getenv(strings.ToUpper(key))
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if proxyValue == "" {
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return os.Getenv(strings.ToLower(key))
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}
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return proxyValue
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}
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// DialerFromEnvironment takes in a "direct" *net.Dialer and returns a
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// proxy.Dialer which will route the connections through the proxy using the
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// given dialer.
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func DialerFromEnvironment(direct *net.Dialer) (proxy.Dialer, error) {
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allProxy := GetProxyEnv("all_proxy")
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if len(allProxy) == 0 {
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return direct, nil
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}
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proxyURL, err := url.Parse(allProxy)
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if err != nil {
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return direct, err
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}
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proxyFromURL, err := proxy.FromURL(proxyURL, direct)
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if err != nil {
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return direct, err
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}
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noProxy := GetProxyEnv("no_proxy")
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if len(noProxy) == 0 {
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return proxyFromURL, nil
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}
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perHost := proxy.NewPerHost(proxyFromURL, direct)
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perHost.AddFromString(noProxy)
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return perHost, nil
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}
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