feat: Add RequestUrlUtils for building base URLs and refactor OutdoorFairController to use it

ruoyi-bussiness/src/test/java/com/ruoyi/cms/controller/cms/OutdoorFairControllerTest.java

@@ -0,0 +1,65 @@
+package com.ruoyi.cms.controller.cms;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.mock.web.MockHttpServletRequest;
+
+import java.lang.reflect.Method;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class OutdoorFairControllerTest
+{
+    @Test
+    void companyQrCodeUrlUsesPublicForwardedHost() throws Exception
+    {
+        MockHttpServletRequest request = new MockHttpServletRequest();
+        request.setScheme("http");
+        request.setServerName("127.0.0.1");
+        request.setServerPort(9091);
+        request.addHeader("X-Forwarded-Proto", "http");
+        request.addHeader("X-Forwarded-Host", "39.98.44.136");
+        request.addHeader("X-Forwarded-Port", "6024");
+
+        assertEquals(
+                "http://39.98.44.136:6024/h5/outdoor-fair/company.html?fairId=12&companyId=34",
+                buildCompanyH5Url(request, 12L, 34L));
+    }
+
+    @Test
+    void companyQrCodeUrlUsesStandardForwardedHeader() throws Exception
+    {
+        MockHttpServletRequest request = new MockHttpServletRequest();
+        request.setScheme("http");
+        request.setServerName("127.0.0.1");
+        request.setServerPort(9091);
+        request.addHeader("Forwarded", "for=192.0.2.10;proto=https;host=jobs.example.com:8443");
+
+        assertEquals(
+                "https://jobs.example.com:8443/h5/outdoor-fair/company.html?fairId=12&companyId=34",
+                buildCompanyH5Url(request, 12L, 34L));
+    }
+
+    @Test
+    void companyQrCodeUrlUsesHostHeaderWithoutForwardedHeaders() throws Exception
+    {
+        MockHttpServletRequest request = new MockHttpServletRequest();
+        request.setScheme("https");
+        request.setServerName("127.0.0.1");
+        request.setServerPort(9091);
+        request.addHeader("Host", "jobs.example.com");
+
+        assertEquals(
+                "https://jobs.example.com/h5/outdoor-fair/company.html?fairId=12&companyId=34",
+                buildCompanyH5Url(request, 12L, 34L));
+    }
+
+    private String buildCompanyH5Url(MockHttpServletRequest request, Long fairId, Long companyId)
+            throws Exception
+    {
+        OutdoorFairController controller = new OutdoorFairController();
+        Method method = OutdoorFairController.class.getDeclaredMethod(
+                "buildOutdoorFairCompanyH5Url", javax.servlet.http.HttpServletRequest.class, Long.class, Long.class);
+        method.setAccessible(true);
+        return (String) method.invoke(controller, request, fairId, companyId);
+    }
+}