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package unixproxy
import (
"context"
"fmt"
"net"
"net/url"
"strings"
)
// ParseURI parses the given URI to a network and address that can be passed to
// e.g. [net.Listen].
//
// The URI scheme is interpreted as the network, and the host (and port) are
// interpreted as the address. For example, "tcp://:80" is parsed to a network
// of "tcp" and an address of ":80", and "unix:///tmp/my.sock" is parsed to a
// network of "unix" and an address of "/tmp/my.sock".
//
// If the URI doesn't have a scheme, "tcp://" is assumed by default, in an
// attempt to keep basic compatibilty with common listen addresses like
// "localhost:8080" or ":9090".
func ParseURI(uri string) (network, address string, _ error) {
uri = strings.TrimSpace(uri)
if uri == "" {
return "", "", fmt.Errorf("empty URI")
}
if !strings.Contains(uri, "://") {
uri = "tcp://" + uri
}
u, err := url.Parse(uri)
if err != nil {
return "", "", err
}
if u.Scheme == "" {
u.Scheme = "tcp"
}
if u.Host == "" && u.Path != "" {
u.Host = u.Path
u.Path = ""
}
return u.Scheme, u.Host, nil
}
// ListenURI is a helper function that parses the provided URI via ParseURI, and
// returns a [net.Listener] listening on the parsed network and address.
func ListenURI(ctx context.Context, uri string) (net.Listener, error) {
network, address, err := ParseURI(uri)
if err != nil {
return nil, err
}
config := net.ListenConfig{}
listener, err := config.Listen(ctx, network, address)
if err != nil {
return nil, fmt.Errorf("listen: %w", err)
}
return listener, nil
}
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