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