well-goknown/vendor/github.com/nbd-wtf/go-nostr/nip11/fetch.go

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package nip11
import (
"context"
"encoding/json"
"fmt"
"net/http"
"time"
"github.com/nbd-wtf/go-nostr"
)
// Fetch fetches the NIP-11 metadata for a relay.
//
// It will always return `info` with at least `URL` filled -- even if we can't connect to the
// relay or if it doesn't have a NIP-11 handler -- although in that case it will also return
// an error.
func Fetch(ctx context.Context, u string) (info RelayInformationDocument, err error) {
if _, ok := ctx.Deadline(); !ok {
// if no timeout is set, force it to 7 seconds
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, 7*time.Second)
defer cancel()
}
// normalize URL to start with http://, https:// or without protocol
u = nostr.NormalizeURL(u)
info = RelayInformationDocument{
URL: u,
}
// make request
req, err := http.NewRequestWithContext(ctx, "GET", "http"+u[2:], nil)
// add the NIP-11 header
req.Header.Add("Accept", "application/nostr+json")
// send the request
resp, err := http.DefaultClient.Do(req)
if err != nil {
return info, fmt.Errorf("request failed: %w", err)
}
defer resp.Body.Close()
if err := json.NewDecoder(resp.Body).Decode(&info); err != nil {
return info, fmt.Errorf("invalid json: %w", err)
}
return info, nil
}