feat: implement AS holder name resolution and enhance ASEntry structure. Add ASHolderName function to retrieve organization names from RIPEstat, update ASEntry model to include ASN name, prefix count, and resolution timestamp. Modify database interactions and API responses to support new fields, improving ASN metadata handling.

internal/asnresolve/ripestat.go

@@ -18,6 +18,9 @@ import (
 // DefaultRIPEStatURL is the RIPEstat announced-prefixes data call (no API key).
 const DefaultRIPEStatURL = "https://stat.ripe.net/data/announced-prefixes/data.json"
 
+// DefaultASOverviewURL is the RIPEstat as-overview data call (holder / org name, no API key).
+const DefaultASOverviewURL = "https://stat.ripe.net/data/as-overview/data.json"
+
 // AnnouncedPrefixes returns currently announced IPv4/IPv6 prefixes for the ASN (best-effort via RIPEstat).
 func AnnouncedPrefixes(ctx context.Context, hc *http.Client, asn int64) ([]netip.Prefix, error) {
 	if hc == nil {
@@ -80,6 +83,51 @@ func AnnouncedPrefixes(ctx context.Context, hc *http.Client, asn int64) ([]netip
 	return out, nil
 }
 
+// ASHolderName returns the holder / organization label for the ASN from RIPEstat as-overview (best-effort).
+func ASHolderName(ctx context.Context, hc *http.Client, asn int64) (string, error) {
+	if hc == nil {
+		hc = http.DefaultClient
+	}
+	base := strings.TrimSpace(os.Getenv("EVOBGP_RIPESTAT_AS_OVERVIEW_URL"))
+	if base == "" {
+		base = DefaultASOverviewURL
+	}
+	u := fmt.Sprintf("%s?resource=AS%d", strings.TrimSuffix(base, "?"), asn)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, u, nil)
+	if err != nil {
+		return "", err
+	}
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("User-Agent", "evobgp-asnresolve/1.0")
+
+	resp, err := hc.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("ripestat as-overview AS%d: %w", asn, err)
+	}
+	defer resp.Body.Close()
+	body, err := io.ReadAll(io.LimitReader(resp.Body, 4<<20))
+	if err != nil {
+		return "", err
+	}
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("ripestat as-overview AS%d: HTTP %s: %s", asn, resp.Status, truncateForErr(body, 200))
+	}
+
+	var wrap struct {
+		Status string `json:"status"`
+		Data   struct {
+			Holder string `json:"holder"`
+		} `json:"data"`
+	}
+	if err := json.Unmarshal(body, &wrap); err != nil {
+		return "", fmt.Errorf("ripestat as-overview AS%d: json: %w", asn, err)
+	}
+	if wrap.Status != "" && wrap.Status != "ok" {
+		return "", fmt.Errorf("ripestat as-overview AS%d: status %q", asn, wrap.Status)
+	}
+	return strings.TrimSpace(wrap.Data.Holder), nil
+}
+
 func truncateForErr(b []byte, n int) string {
 	s := string(b)
 	if len(s) > n {

internal/asnresolve/ripestat_test.go

@@ -31,3 +31,24 @@ func TestAnnouncedPrefixes_Mock(t *testing.T) {
 		t.Fatalf("order or values: %#v", pfx)
 	}
 }
+
+func TestASHolderName_Mock(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Query().Get("resource") != "AS64496" {
+			t.Fatalf("resource: %q", r.URL.Query().Get("resource"))
+		}
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`{"status":"ok","data":{"holder":"Example Networks Ltd"}}`))
+	}))
+	defer ts.Close()
+
+	t.Setenv("EVOBGP_RIPESTAT_AS_OVERVIEW_URL", ts.URL)
+
+	name, err := ASHolderName(context.Background(), ts.Client(), 64496)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if name != "Example Networks Ltd" {
+		t.Fatalf("holder: %q", name)
+	}
+}