Add tests for cloud mode introspection

It's a pain to mock the environment variables in the tests. I introduced
a different `system-stubs-jupiter` library to help with that because
`org.junitpioneer.jupiter` did not work as expected in a Spring Boot
environment.

Ideally I think we should have a mockable custom `Environment` interface
that we use throughout the application, instead of reaching for
`System.getenv()` directly.

The method for mocking that worked is described in this guide:
https://www.baeldung.com/java-system-stubs#environment-and-property-overrides-for-junit-5-spring-tests

inngest-spring-boot-demo/build.gradle.kts

@@ -26,6 +26,12 @@ dependencies {
     implementation("com.squareup.okhttp3:okhttp:4.12.0")
 
     testImplementation("org.springframework.boot:spring-boot-starter-test")
+
+    if (JavaVersion.current().isJava11Compatible) {
+        testImplementation("uk.org.webcompere:system-stubs-jupiter:2.1.6")
+    } else {
+        testImplementation("uk.org.webcompere:system-stubs-jupiter:1.2.1")
+    }
 }
 
 dependencyManagement {
@@ -39,6 +45,7 @@ dependencyManagement {
 tasks.withType<Test> {
     useJUnitPlatform()
     systemProperty("junit.jupiter.execution.parallel.enabled", true)
+    jvmArgs = listOf("-Dnet.bytebuddy.experimental=true")
     testLogging {
         events =
             setOf(

inngest-spring-boot-demo/src/test/java/com/inngest/springbootdemo/CloudModeIntrospectionTest.java

@@ -0,0 +1,137 @@
+package com.inngest.springbootdemo;
+
+import com.inngest.*;
+import com.inngest.signingkey.BearerTokenKt;
+import com.inngest.signingkey.SignatureVerificationKt;
+import com.inngest.springboot.InngestConfiguration;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Import;
+import org.springframework.test.web.servlet.MockMvc;
+import uk.org.webcompere.systemstubs.environment.EnvironmentVariables;
+import uk.org.webcompere.systemstubs.jupiter.SystemStub;
+import uk.org.webcompere.systemstubs.jupiter.SystemStubsExtension;
+
+import java.util.HashMap;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
+
+class ProductionConfiguration extends InngestConfiguration {
+
+    public static final String INNGEST_APP_ID = "spring_test_prod_demo";
+
+    @Override
+    protected HashMap<String, InngestFunction> functions() {
+        return new HashMap<>();
+    }
+
+    @Override
+    protected Inngest inngestClient() {
+        return new Inngest(INNGEST_APP_ID);
+    }
+
+    @Override
+    protected ServeConfig serve(Inngest client) {
+        return new ServeConfig(client);
+    }
+
+    @Bean
+    protected CommHandler commHandler(@Autowired Inngest inngestClient) {
+        ServeConfig serveConfig = new ServeConfig(inngestClient);
+        return new CommHandler(functions(), inngestClient, serveConfig, SupportedFrameworkName.SpringBoot);
+    }
+}
+
+@ExtendWith(SystemStubsExtension.class)
+public class CloudModeIntrospectionTest {
+
+    private static final String productionSigningKey = "signkey-prod-2a89e554826a40672684e75eee6e34909b45aa4fd04fff5ff49bbe28c24ef424";
+    private static final String productionEventKey = "test";
+    @SystemStub
+    private static EnvironmentVariables environmentVariables;
+
+    @BeforeAll
+    static void beforeAll() {
+        environmentVariables.set("INNGEST_DEV", "0");
+        environmentVariables.set("INNGEST_SIGNING_KEY", productionSigningKey);
+        environmentVariables.set("INNGEST_EVENT_KEY", productionEventKey);
+    }
+
+    // The nested class is useful for setting the environment variables before the configuration class (Beans) runs.
+    // https://www.baeldung.com/java-system-stubs#environment-and-property-overrides-for-junit-5-spring-tests
+    @Import(ProductionConfiguration.class)
+    @WebMvcTest(DemoController.class)
+    @Nested
+    class InnerSpringTest {
+        @Autowired
+        private MockMvc mockMvc;
+
+        @Test
+        public void shouldReturnInsecureIntrospectionWhenSignatureIsMissing() throws Exception {
+            mockMvc.perform(get("/api/inngest").header("Host", "localhost:8080"))
+                    .andExpect(status().isOk())
+                    .andExpect(content().contentType("application/json"))
+                    .andExpect(header().string(InngestHeaderKey.Framework.getValue(), "springboot"))
+                    .andExpect(jsonPath("$.authentication_succeeded").value(false))
+                    .andExpect(jsonPath("$.function_count").isNumber())
+                    .andExpect(jsonPath("$.has_event_key").value(true))
+                    .andExpect(jsonPath("$.has_signing_key").value(true))
+                    .andExpect(jsonPath("$.mode").value("cloud"))
+                    .andExpect(jsonPath("$.schema_version").value("2024-05-24"));
+        }
+
+        @Test
+        public void shouldReturnInsecureIntrospectionWhenSignatureIsInvalid() throws Exception {
+            mockMvc.perform(get("/api/inngest")
+                            .header("Host", "localhost:8080")
+                            .header(InngestHeaderKey.Signature.getValue(), "invalid-signature"))
+                    .andExpect(status().isOk())
+                    .andExpect(content().contentType("application/json"))
+                    .andExpect(header().string(InngestHeaderKey.Framework.getValue(), "springboot"))
+                    .andExpect(jsonPath("$.authentication_succeeded").value(false))
+                    .andExpect(jsonPath("$.function_count").isNumber())
+                    .andExpect(jsonPath("$.has_event_key").value(true))
+                    .andExpect(jsonPath("$.has_signing_key").value(true))
+                    .andExpect(jsonPath("$.mode").value("cloud"))
+                    .andExpect(jsonPath("$.schema_version").value("2024-05-24"));
+        }
+
+        @Test
+        public void shouldReturnSecureIntrospectionWhenSignatureIsValid() throws Exception {
+            long currentTimestamp = System.currentTimeMillis() / 1000;
+
+            String signature = SignatureVerificationKt.signRequest("", currentTimestamp, productionSigningKey);
+            String formattedSignature = String.format("s=%s&t=%d", signature, currentTimestamp);
+
+            String expectedSigningKeyHash = BearerTokenKt.hashedSigningKey(productionSigningKey);
+
+            mockMvc.perform(get("/api/inngest")
+                            .header("Host", "localhost:8080")
+                            .header(InngestHeaderKey.Signature.getValue(), formattedSignature))
+                    .andExpect(status().isOk())
+                    .andExpect(content().contentType("application/json"))
+                    .andExpect(header().string(InngestHeaderKey.Framework.getValue(), "springboot"))
+                    .andExpect(jsonPath("$.authentication_succeeded").value(true))
+                    .andExpect(jsonPath("$.function_count").isNumber())
+                    .andExpect(jsonPath("$.has_event_key").value(true))
+                    .andExpect(jsonPath("$.has_signing_key").value(true))
+                    .andExpect(jsonPath("$.mode").value("cloud"))
+                    .andExpect(jsonPath("$.schema_version").value("2024-05-24"))
+                    .andExpect(jsonPath("$.api_origin").value("https://api.inngest.com/"))
+                    .andExpect(jsonPath("$.app_id").value(ProductionConfiguration.INNGEST_APP_ID))
+                    .andExpect(jsonPath("$.env").value("prod"))
+                    .andExpect(jsonPath("$.event_api_origin").value("https://inn.gs/"))
+                    .andExpect(jsonPath("$.framework").value("springboot"))
+                    .andExpect(jsonPath("$.sdk_language").value("java"))
+                    .andExpect(jsonPath("$.event_key_hash").value("9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08"))
+                    .andExpect(jsonPath("$.sdk_version").value(Version.Companion.getVersion()))
+                    .andExpect(jsonPath("$.signing_key_hash").value(expectedSigningKeyHash));
+        }
+    }
+}

inngest-spring-boot-demo/src/test/java/com/inngest/springbootdemo/IntrospectTest.java → inngest-spring-boot-demo/src/test/java/com/inngest/springbootdemo/DevModeIntrospectionTest.java

@@ -12,7 +12,7 @@
 
 @Import(DemoTestConfiguration.class)
 @WebMvcTest(DemoController.class)
-public class IntrospectTest {
+public class DevModeIntrospectionTest {
 
     @Autowired
     private MockMvc mockMvc;