Wrote url normalizer function.

url.go

@@ -2,6 +2,7 @@ package honeybee
 
 import (
 	"net/url"
+	"strings"
 
 	"git.wisehodl.dev/jay/go-honeybee/errors"
 )
@@ -18,3 +19,22 @@ func ParseURL(urlStr string) (*url.URL, error) {
 
 	return parsedURL, nil
 }
+
+func NormalizeURL(input string) (string, error) {
+	parsed, err := ParseURL(strings.ToLower(input))
+	if err != nil {
+		return "", err
+	}
+
+	host := parsed.Hostname()
+	port := parsed.Port()
+	if (parsed.Scheme == "wss" && port == "443") ||
+		(parsed.Scheme == "ws" && port == "80") {
+		parsed.Host = host
+	}
+
+	parsed.Path = strings.TrimRight(parsed.Path, "/")
+
+	return parsed.String(), nil
+
+}

url_test.go

@@ -91,3 +91,75 @@ func TestParseURL(t *testing.T) {
 		})
 	}
 }
+
+func TestNormalizeURL(t *testing.T) {
+	cases := []struct {
+		name     string
+		input    string
+		expected string
+	}{
+		{
+			name:     "strip trailing slash",
+			input:    "wss://relay.example.com/",
+			expected: "wss://relay.example.com",
+		},
+		{
+			name:     "strip multiple trailing slashes",
+			input:    "wss://relay.example.com//",
+			expected: "wss://relay.example.com",
+		},
+		{
+			name:     "strip trailing slash with path",
+			input:    "wss://relay.example.com/path/",
+			expected: "wss://relay.example.com/path",
+		},
+		{
+			name:     "lowercase scheme",
+			input:    "WSS://relay.example.com",
+			expected: "wss://relay.example.com",
+		},
+		{
+			name:     "lowercase host",
+			input:    "wss://Relay.Example.Com",
+			expected: "wss://relay.example.com",
+		},
+		{
+			name:     "strip default wss port",
+			input:    "wss://relay.example.com:443",
+			expected: "wss://relay.example.com",
+		},
+		{
+			name:     "strip default ws port",
+			input:    "ws://relay.example.com:80",
+			expected: "ws://relay.example.com",
+		},
+		{
+			name:     "preserve non-default port",
+			input:    "wss://relay.example.com:8080",
+			expected: "wss://relay.example.com:8080",
+		},
+		{
+			name:     "preserve path",
+			input:    "wss://relay.example.com/nostr",
+			expected: "wss://relay.example.com/nostr",
+		},
+		{
+			name:     "no change needed",
+			input:    "wss://relay.example.com",
+			expected: "wss://relay.example.com",
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			got, err := NormalizeURL(tc.input)
+			assert.NoError(t, err)
+			assert.Equal(t, tc.expected, got)
+		})
+	}
+}
+
+func TestNormalizeURLError(t *testing.T) {
+	_, err := NormalizeURL("http://relay.example.com")
+	assert.ErrorIs(t, err, errors.InvalidProtocol)
+}