139 lines
3.3 KiB
Go
139 lines
3.3 KiB
Go
package httputil
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import (
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"net/http"
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"net/url"
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"strings"
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"fmt"
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"github.com/git-lfs/git-lfs/config"
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)
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// Logic is copied, with small changes, from "net/http".ProxyFromEnvironment in the go std lib.
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func ProxyFromGitConfigOrEnvironment(c *config.Configuration) func(req *http.Request) (*url.URL, error) {
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var https_proxy string
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http_proxy, _ := c.Git.Get("http.proxy")
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if strings.HasPrefix(http_proxy, "https://") {
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https_proxy = http_proxy
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}
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if len(https_proxy) == 0 {
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https_proxy, _ = c.Os.Get("HTTPS_PROXY")
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}
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if len(https_proxy) == 0 {
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https_proxy, _ = c.Os.Get("https_proxy")
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}
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if len(http_proxy) == 0 {
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http_proxy, _ = c.Os.Get("HTTP_PROXY")
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}
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if len(http_proxy) == 0 {
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http_proxy, _ = c.Os.Get("http_proxy")
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}
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no_proxy, _ := c.Os.Get("NO_PROXY")
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if len(no_proxy) == 0 {
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no_proxy, _ = c.Os.Get("no_proxy")
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}
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return func(req *http.Request) (*url.URL, error) {
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var proxy string
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if req.URL.Scheme == "https" {
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proxy = https_proxy
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}
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if len(proxy) == 0 {
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proxy = http_proxy
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}
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if len(proxy) == 0 {
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return nil, nil
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}
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if !useProxy(no_proxy, canonicalAddr(req.URL)) {
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return nil, nil
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}
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proxyURL, err := url.Parse(proxy)
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if err != nil || !strings.HasPrefix(proxyURL.Scheme, "http") {
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// proxy was bogus. Try prepending "http://" to it and
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// see if that parses correctly. If not, we fall
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// through and complain about the original one.
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if proxyURL, err := url.Parse("http://" + proxy); err == nil {
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return proxyURL, nil
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}
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}
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if err != nil {
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return nil, fmt.Errorf("invalid proxy address: %q: %v", proxy, err)
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}
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return proxyURL, nil
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}
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}
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// canonicalAddr returns url.Host but always with a ":port" suffix
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// Copied from "net/http".ProxyFromEnvironment in the go std lib.
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func canonicalAddr(url *url.URL) string {
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addr := url.Host
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if !hasPort(addr) {
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return addr + ":" + portMap[url.Scheme]
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}
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return addr
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}
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// useProxy reports whether requests to addr should use a proxy,
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// according to the NO_PROXY or no_proxy environment variable.
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// addr is always a canonicalAddr with a host and port.
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// Copied from "net/http".ProxyFromEnvironment in the go std lib
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// and adapted to allow proxy usage even for localhost.
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func useProxy(no_proxy, addr string) bool {
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if len(addr) == 0 {
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return true
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}
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if no_proxy == "*" {
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return false
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}
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addr = strings.ToLower(strings.TrimSpace(addr))
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if hasPort(addr) {
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addr = addr[:strings.LastIndex(addr, ":")]
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}
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for _, p := range strings.Split(no_proxy, ",") {
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p = strings.ToLower(strings.TrimSpace(p))
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if len(p) == 0 {
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continue
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}
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if hasPort(p) {
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p = p[:strings.LastIndex(p, ":")]
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}
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if addr == p {
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return false
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}
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if p[0] == '.' && (strings.HasSuffix(addr, p) || addr == p[1:]) {
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// no_proxy ".foo.com" matches "bar.foo.com" or "foo.com"
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return false
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}
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if p[0] != '.' && strings.HasSuffix(addr, p) && addr[len(addr)-len(p)-1] == '.' {
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// no_proxy "foo.com" matches "bar.foo.com"
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return false
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}
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}
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return true
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}
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// Given a string of the form "host", "host:port", or "[ipv6::address]:port",
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// return true if the string includes a port.
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// Copied from "net/http".ProxyFromEnvironment in the go std lib.
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func hasPort(s string) bool { return strings.LastIndex(s, ":") > strings.LastIndex(s, "]") }
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var (
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portMap = map[string]string{
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"http": "80",
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"https": "443",
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}
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)
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