move stuff back from nostr package to top level.

because otherwise the path must be specified as github.com/fiatjaf/go-nostr/nostr, which is annoying.

normalize.go

@@ -0,0 +1,28 @@
+package nostr
+
+import (
+	"net/url"
+	"strings"
+)
+
+func NormalizeURL(u string) string {
+	if !strings.HasPrefix(u, "http") && !strings.HasPrefix(u, "ws") {
+		u = "wss://" + u
+	}
+	p, err := url.Parse(u)
+	if err != nil {
+		return ""
+	}
+
+	if p.Scheme == "http" {
+		p.Scheme = "ws"
+	} else if p.Scheme == "https" {
+		p.Scheme = "wss"
+	}
+
+	if strings.HasSuffix(p.RawPath, "/") {
+		p.RawPath = p.RawPath[0 : len(p.RawPath)-1]
+	}
+
+	return p.String()
+}