feat: add echo for springboot http template (#1072)

* feat: add echo func

* chore: package

* docs: update docs

* refactor: add space between headers

* refactor: regenerate zz file

* refactor: clean with pre-commit

* refactor: add func_yaml-schema.json file

* refactor: rename test and fix white-spaces

* refactor: remove .idea files

* test: change http test

* test: change expected result

templates/springboot/http/README.md

@@ -2,7 +2,7 @@
 
 Welcome to your new Function project!
 
-This sample project contains a single function based on Spring Cloud Function: `functions.CloudFunctionApplication.uppercase()`, which returns the uppercase of the data passed.
+This sample project contains a single function based on Spring Cloud Function: `functions.CloudFunctionApplication.echo()`, which returns an echo of the data passed via HTTP request.
 
 ## Local execution
 
@@ -86,7 +86,7 @@ export URL=$(kn service describe $(basename $PWD) -ourl)
 Using `func invoke` command with Path-Based routing:
 
 ```shell script
-func invoke --target "$URL/uppercase" --data "$(whoami)"
+func invoke --target "$URL/echo" --data "$(whoami)"
 ```
 
 If your function class only contains one function, then you can leave out the target path:
@@ -98,7 +98,7 @@ func invoke --data "$(whoami)"
 ### cURL
 
 ```shell script
-curl -v "$URL/uppercase" \
+curl -v "$URL/echo" \
   -H "Content-Type:text/plain" \
   -w "\n" \
   -d "$(whoami)"
@@ -116,7 +116,7 @@ curl -v "$URL" \
 ### HTTPie
 
 ```shell script
-echo "$(whoami)" | http -v "$URL/uppercase"
+echo "$(whoami)" | http -v "$URL/echo"
 ```
 
 If your function class only contains one function, then you can leave out the target path:

templates/springboot/http/src/main/java/functions/CloudFunctionApplication.java

@@ -1,9 +1,11 @@
 package functions;
 
-import java.util.function.Function;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
+import org.springframework.messaging.Message;
+
+import java.util.function.Function;
 
 @SpringBootApplication
 public class CloudFunctionApplication {
@@ -13,8 +15,22 @@ public class CloudFunctionApplication {
   }
 
   @Bean
-  public Function<String, String> uppercase() {
-    return String::toUpperCase;
-  }
+  public Function<Message<String>, String> echo() {
+    return (inputMessage) -> {
 
+      var stringBuilder = new StringBuilder();
+      inputMessage.getHeaders()
+        .forEach((key, value) -> {
+          stringBuilder.append(key).append(": ").append(value).append(" ");
+        });
+
+      var payload = inputMessage.getPayload();
+
+      if (!payload.isBlank()) {
+        stringBuilder.append("echo: ").append(payload);
+      }
+
+      return stringBuilder.toString();
+    };
+  }
 }

templates/springboot/http/src/test/java/functions/EchoCaseFunctionTest.java

@@ -14,18 +14,29 @@ import static org.hamcrest.Matchers.*;
 
 @SpringBootTest(classes = CloudFunctionApplication.class,
   webEnvironment = WebEnvironment.RANDOM_PORT)
-public class UpperCaseFunctionTest {
+public class EchoCaseFunctionTest {
 
   @Autowired
   private TestRestTemplate rest;
 
   @Test
-  public void testUpperCase() throws Exception {
+  public void testEchoWithBody() throws Exception {
     ResponseEntity<String> response = this.rest.exchange(
-      RequestEntity.post(new URI("/uppercase"))
+      RequestEntity.post(new URI("/echo"))
                    .body("hello"), String.class);
     assertThat(response.getStatusCode()
                        .value(), equalTo(200));
-    assertThat(response.getBody(), equalTo("HELLO"));
+    assertThat(response.getBody(), containsString("echo: hello"));
+  }
+
+  @Test
+  public void testEchoWithoutBody() throws Exception {
+    ResponseEntity<String> response = this.rest.exchange(
+      RequestEntity.get(new URI("/echo/"))
+          .header("custom-header", "custom-value")
+            .build(), String.class);
+    assertThat(response.getStatusCode()
+      .value(), equalTo(200));
+    assertThat(response.getBody(), containsString("custom-header: custom-value"));
   }
 }

test/_e2e/trigger_http_test.go

@@ -86,10 +86,10 @@ var defaultFunctionsHttpValidators = []FunctionHttpResponsivenessValidator{
 		expects:   `{"message":"hello"}`,
 	},
 	{runtime: "springboot",
-		targetUrl: "%s/uppercase",
+		targetUrl: "%s/echo",
 		method:    "POST",
 		bodyData:  "message=hello",
-		expects:   `MESSAGE=HELLO`,
+		expects:   `message=hello`,
 	},
 	{runtime: "typescript",
 		targetUrl:   "%s",