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package source
import (
"fmt"
"log/slog"
"net/netip"
nurl "net/url"
)
// a simple source that fetches an address from a url.
// sends a http get request to url, and parses whatever it found there.
// can be used to fetch address values from generic "my ip"
// services which don't have direct support.
// note that the address does have to be returned in plain-text!
type urlSource struct {
log *slog.Logger
url *nurl.URL
family Family
}
var _ Source = (*urlSource)(nil)
func newURL(log *slog.Logger, cfg Config) (*urlSource, error) {
log = log.With("source", "url")
url, err := nurl.ParseRequestURI(cfg.URL)
if err != nil {
return nil, fmt.Errorf("invalid url for source: %w", err)
}
return &urlSource{log: log, url: url, family: cfg.Family}, nil
}
func (s *urlSource) Supports(f Family) bool { return f == s.family }
func (s *urlSource) Lookup(Family) (netip.Addr, error) {
s.log.Info(
"will look up address via fetching from url",
slog.String("url", s.url.String()),
slog.String("family", string(s.family)),
)
addr, err := fetch(s.url.String(), s.family)
if err != nil {
return netip.Addr{}, fmt.Errorf("failed to source address from url: %w", err)
}
return addr, nil
}
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