gitech

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// Copyright 2021 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package proxy
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import (
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	"net/http"
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	"net/url"
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	"os"
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	"strings"
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	"sync"
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	"code.gitea.io/gitea/modules/log"
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	"code.gitea.io/gitea/modules/setting"
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	"github.com/gobwas/glob"
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)
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var (
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	once         sync.Once
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	hostMatchers []glob.Glob
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)
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// GetProxyURL returns proxy url
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func GetProxyURL() string {
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	if !setting.Proxy.Enabled {
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		return ""
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	}
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	if setting.Proxy.ProxyURL == "" {
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		if os.Getenv("http_proxy") != "" {
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			return os.Getenv("http_proxy")
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		}
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		return os.Getenv("https_proxy")
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	}
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	return setting.Proxy.ProxyURL
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}
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// Match return true if url needs to be proxied
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func Match(u string) bool {
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	if !setting.Proxy.Enabled {
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		return false
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	}
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	// enforce do once
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	Proxy()
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	for _, v := range hostMatchers {
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		if v.Match(u) {
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			return true
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		}
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	}
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	return false
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}
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// Proxy returns the system proxy
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func Proxy() func(req *http.Request) (*url.URL, error) {
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	if !setting.Proxy.Enabled {
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		return func(req *http.Request) (*url.URL, error) {
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			return nil, nil
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		}
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	}
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	if setting.Proxy.ProxyURL == "" {
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		return http.ProxyFromEnvironment
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	}
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	once.Do(func() {
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		for _, h := range setting.Proxy.ProxyHosts {
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			if g, err := glob.Compile(h); err == nil {
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				hostMatchers = append(hostMatchers, g)
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			} else {
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				log.Error("glob.Compile %s failed: %v", h, err)
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			}
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		}
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	})
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	return func(req *http.Request) (*url.URL, error) {
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		for _, v := range hostMatchers {
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			if v.Match(req.URL.Host) {
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				return http.ProxyURL(setting.Proxy.ProxyURLFixed)(req)
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			}
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		}
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		return http.ProxyFromEnvironment(req)
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	}
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}
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// EnvWithProxy returns os.Environ(), with a https_proxy env, if the given url
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// needs to be proxied.
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func EnvWithProxy(u *url.URL) []string {
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	envs := os.Environ()
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	if strings.EqualFold(u.Scheme, "http") || strings.EqualFold(u.Scheme, "https") {
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		if Match(u.Host) {
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			envs = append(envs, "https_proxy="+GetProxyURL())
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		}
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	}
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	return envs
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}
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