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package io.prerender;
import com.github.tomakehurst.wiremock.client.WireMock;
import com.github.tomakehurst.wiremock.core.WireMockConfiguration;
import com.github.tomakehurst.wiremock.junit5.WireMockExtension;
import jakarta.servlet.FilterChain;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.junit.jupiter.api.extension.RegisterExtension;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.http.HttpClient;
import static com.github.tomakehurst.wiremock.client.WireMock.*;
import static com.github.tomakehurst.wiremock.core.WireMockConfiguration.wireMockConfig;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.*;
@ExtendWith(MockitoExtension.class)
class PrerenderFilterTest {
private static final String BOT_UA = "Mozilla/5.0 (compatible; Googlebot/2.1)";
private static final String BROWSER_UA = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36";
private static final String PRERENDERED_HTML = "<html><body>prerendered</body></html>";
@RegisterExtension
static WireMockExtension wireMock = WireMockExtension.newInstance()
.options(wireMockConfig().dynamicPort())
.build();
@Mock private HttpServletRequest request;
@Mock private HttpServletResponse response;
@Mock private FilterChain chain;
private StringWriter responseWriter;
private PrerenderFilter filter;
@BeforeEach
void setUp() throws Exception {
wireMock.resetAll();
responseWriter = new StringWriter();
lenient().when(response.getWriter()).thenReturn(new PrintWriter(responseWriter));
PrerenderConfig config = new PrerenderConfig(null, "http://localhost:" + wireMock.getPort());
filter = new PrerenderFilter(HttpClient.newHttpClient(), config);
}
@Test
void browserRequest_passesThrough() throws Exception {
when(request.getMethod()).thenReturn("GET");
when(request.getRequestURI()).thenReturn("/");
when(request.getParameter("_escaped_fragment_")).thenReturn(null);
when(request.getHeader("X-Bufferbot")).thenReturn(null);
when(request.getHeader("User-Agent")).thenReturn(BROWSER_UA);
filter.doFilter(request, response, chain);
verify(chain).doFilter(request, response);
verify(response, never()).setStatus(anyInt());
}
@Test
void botRequest_receivesPrerenderedResponse() throws Exception {
wireMock.stubFor(get(anyUrl())
.willReturn(aResponse().withStatus(200).withBody(PRERENDERED_HTML)));
when(request.getMethod()).thenReturn("GET");
when(request.getRequestURI()).thenReturn("/");
when(request.getParameter("_escaped_fragment_")).thenReturn(null);
when(request.getHeader("X-Bufferbot")).thenReturn(null);
when(request.getHeader("User-Agent")).thenReturn(BOT_UA);
when(request.getRequestURL()).thenReturn(new StringBuffer("http://example.com/"));
when(request.getQueryString()).thenReturn(null);
filter.doFilter(request, response, chain);
verify(response).setStatus(200);
verify(chain, never()).doFilter(any(), any());
assertEquals(PRERENDERED_HTML, responseWriter.toString());
}
@Test
void botRequest_staticAsset_passesThrough() throws Exception {
when(request.getMethod()).thenReturn("GET");
when(request.getRequestURI()).thenReturn("/styles.css");
filter.doFilter(request, response, chain);
verify(chain).doFilter(request, response);
verify(response, never()).setStatus(anyInt());
}
@Test
void botRequest_fontAsset_passesThrough() throws Exception {
when(request.getMethod()).thenReturn("GET");
when(request.getRequestURI()).thenReturn("/fonts/inter.woff2");
filter.doFilter(request, response, chain);
verify(chain).doFilter(request, response);
verify(response, never()).setStatus(anyInt());
}
@Test
void escapedFragment_triggersPrerender() throws Exception {
wireMock.stubFor(get(anyUrl())
.willReturn(aResponse().withStatus(200).withBody(PRERENDERED_HTML)));
when(request.getMethod()).thenReturn("GET");
when(request.getRequestURI()).thenReturn("/");
when(request.getParameter("_escaped_fragment_")).thenReturn("");
when(request.getHeader("User-Agent")).thenReturn(BROWSER_UA);
when(request.getRequestURL()).thenReturn(new StringBuffer("http://example.com/"));
when(request.getQueryString()).thenReturn("_escaped_fragment_=");
filter.doFilter(request, response, chain);
verify(response).setStatus(200);
verify(chain, never()).doFilter(any(), any());
}
@Test
void xBufferbot_triggersPrerender() throws Exception {
wireMock.stubFor(get(anyUrl())
.willReturn(aResponse().withStatus(200).withBody(PRERENDERED_HTML)));
when(request.getMethod()).thenReturn("GET");
when(request.getRequestURI()).thenReturn("/");
when(request.getParameter("_escaped_fragment_")).thenReturn(null);
when(request.getHeader("X-Bufferbot")).thenReturn("true");
when(request.getHeader("User-Agent")).thenReturn(BROWSER_UA);
when(request.getRequestURL()).thenReturn(new StringBuffer("http://example.com/"));
when(request.getQueryString()).thenReturn(null);
filter.doFilter(request, response, chain);
verify(response).setStatus(200);
verify(chain, never()).doFilter(any(), any());
}
@Test
void postRequest_passesThrough() throws Exception {
when(request.getMethod()).thenReturn("POST");
filter.doFilter(request, response, chain);
verify(chain).doFilter(request, response);
verify(response, never()).setStatus(anyInt());
}
@Test
void networkError_fallsBackToNormalResponse() throws Exception {
wireMock.stubFor(get(anyUrl())
.willReturn(aResponse().withFault(com.github.tomakehurst.wiremock.http.Fault.CONNECTION_RESET_BY_PEER)));
when(request.getMethod()).thenReturn("GET");
when(request.getRequestURI()).thenReturn("/");
when(request.getParameter("_escaped_fragment_")).thenReturn(null);
when(request.getHeader("X-Bufferbot")).thenReturn(null);
when(request.getHeader("User-Agent")).thenReturn(BOT_UA);
when(request.getRequestURL()).thenReturn(new StringBuffer("http://example.com/"));
when(request.getQueryString()).thenReturn(null);
filter.doFilter(request, response, chain);
verify(chain).doFilter(request, response);
}
}