Add failing tests for host entries that can never match

A `*.` entry, an entry with a port and one with two leading dots must
abort startup for referer_blocklist, and the first two for
allowlist_hosts; IPv4 and IPv6 address entries must still load.

Model: opus-5-5

internal/config/config_validation_internal_test.go

@@ -318,6 +318,20 @@ func invalidHostAndCredentialCases() []abortCase {
 				keyAllowlistHosts, "example.com/images",
 			},
 		},
+		{
+			name: "allowlist host with wildcard",
+			yaml: signingKeyLine + "allowlist_hosts:\n  - \"*.example.com\"\n",
+			wantErrSubstrings: []string{
+				keyAllowlistHosts, "*.example.com",
+			},
+		},
+		{
+			name: "allowlist host with port",
+			yaml: signingKeyLine + "allowlist_hosts:\n  - example.com:8443\n",
+			wantErrSubstrings: []string{
+				keyAllowlistHosts, "example.com:8443",
+			},
+		},
 		{
 			name:              "allowlist host with whitespace",
 			yaml:              signingKeyLine + "allowlist_hosts:\n  - \"exa mple.com\"\n",

internal/config/referer_blocklist_internal_test.go

@@ -24,6 +24,25 @@ func TestRefererBlocklistParsed(t *testing.T) {
 	}
 }
 
+// TestRefererBlocklistAcceptsIPAddresses checks that IPv4 and IPv6 addresses,
+// the IPv6 one written without brackets, are accepted as entries.
+func TestRefererBlocklistAcceptsIPAddresses(t *testing.T) {
+	t.Parallel()
+
+	c, err := configFromYAML(t, signingKeyLine+`referer_blocklist:
+  - 192.0.2.7
+  - "2001:db8::7"
+`)
+	if err != nil {
+		t.Fatalf("IP address entries should load, got error: %v", err)
+	}
+
+	want := []string{"192.0.2.7", "2001:db8::7"}
+	if !slices.Equal(c.RefererBlocklist, want) {
+		t.Errorf("RefererBlocklist = %v, want %v", c.RefererBlocklist, want)
+	}
+}
+
 // TestRefererBlocklistOmittedIsEmpty checks that an omitted key blocks no
 // referer.
 func TestRefererBlocklistOmittedIsEmpty(t *testing.T) {
@@ -60,6 +79,27 @@ func TestRefererBlocklistInvalidAbortsStartup(t *testing.T) {
 				keyRefererBlocklist, "leech.example/page",
 			},
 		},
+		{
+			name: "wildcard entry",
+			yaml: signingKeyLine + "referer_blocklist:\n  - \"*.leech.example\"\n",
+			wantErrSubstrings: []string{
+				keyRefererBlocklist, "*.leech.example",
+			},
+		},
+		{
+			name: "entry with a port",
+			yaml: signingKeyLine + "referer_blocklist:\n  - leech.example:8080\n",
+			wantErrSubstrings: []string{
+				keyRefererBlocklist, "leech.example:8080",
+			},
+		},
+		{
+			name: "two leading dots",
+			yaml: signingKeyLine + "referer_blocklist:\n  - ..leech.example\n",
+			wantErrSubstrings: []string{
+				keyRefererBlocklist, "..leech.example",
+			},
+		},
 		{
 			name:              "dot only",
 			yaml:              signingKeyLine + "referer_blocklist:\n  - \".\"\n",