wehub-resource-sync
73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
// Package sysproxy resolves the OS-level proxy (Windows system/PAC settings)
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// for a target URL. ForURL returns nil on platforms without system-proxy
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// support or when no proxy applies, so callers fall back to direct/env.
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package sysproxy
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import (
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"net/url"
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"strings"
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)
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func splitList(s string) []string {
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return strings.FieldsFunc(s, func(r rune) bool {
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return r == ';' || r == ' ' || r == '\t' || r == '\n' || r == '\r'
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})
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}
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// parseProxyList picks a proxy from a WinHTTP/IE proxy string for scheme. The
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// string is either "host:port" (all protocols) or "http=h:p;https=h:p" form.
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func parseProxyList(list, scheme string) *url.URL {
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var fallback string
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for _, f := range splitList(list) {
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if i := strings.IndexByte(f, '='); i >= 0 {
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if strings.EqualFold(f[:i], scheme) {
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return hostProxyURL(f[i+1:])
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}
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continue
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}
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if fallback == "" {
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fallback = f
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}
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}
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if fallback != "" {
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return hostProxyURL(fallback)
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}
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return nil
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}
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func hostProxyURL(hostport string) *url.URL {
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hostport = strings.TrimSpace(hostport)
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if i := strings.Index(hostport, "://"); i >= 0 {
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hostport = hostport[i+3:]
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}
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if hostport == "" {
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return nil
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}
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return &url.URL{Scheme: "http", Host: hostport}
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}
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// bypassed reports whether host matches a WinINET proxy-bypass entry. "<local>"
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// matches dotless (intranet) hosts; a leading "*" is a suffix wildcard.
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func bypassed(host, bypass string) bool {
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host = strings.ToLower(strings.TrimSpace(host))
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if host == "" {
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return false
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}
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for _, e := range splitList(bypass) {
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e = strings.ToLower(e)
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switch {
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case e == "<local>":
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if !strings.Contains(host, ".") {
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return true
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}
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case strings.HasPrefix(e, "*"):
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if strings.HasSuffix(host, strings.TrimPrefix(e, "*")) {
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return true
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}
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case host == e:
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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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