Allow matching with FQDN hosts with trailing periods

pkg/rules/rules.go

@@ -119,6 +119,22 @@ func host(route *mux.Route, hosts ...string) error {
 			if reqHost == host {
 				return true
 			}
+
+			// Check for match on trailing period on host
+			if last := len(host) - 1; last >= 0 && host[last] == '.' {
+				h := host[:last]
+				if reqHost == h {
+					return true
+				}
+			}
+
+			// Check for match on trailing period on request
+			if last := len(reqHost) - 1; last >= 0 && reqHost[last] == '.' {
+				h := reqHost[:last]
+				if h == host {
+					return true
+				}
+			}
 		}
 		return false
 	})

pkg/rules/rules_test.go

@@ -50,6 +50,27 @@ func Test_addRoute(t *testing.T) {
 				"http://localhost/foo": http.StatusOK,
 			},
 		},
+		{
+			desc: "Host with trailing period in rule",
+			rule: "Host(`localhost.`)",
+			expected: map[string]int{
+				"http://localhost/foo": http.StatusOK,
+			},
+		},
+		{
+			desc: "Host with trailing period in domain",
+			rule: "Host(`localhost`)",
+			expected: map[string]int{
+				"http://localhost./foo": http.StatusOK,
+			},
+		},
+		{
+			desc: "Host with trailing period in domain and rule",
+			rule: "Host(`localhost.`)",
+			expected: map[string]int{
+				"http://localhost./foo": http.StatusOK,
+			},
+		},
 		{
 			desc: "wrong Host",
 			rule: "Host(`nope`)",