TSK-1721: implemented an other example to show how to serve static files

rest/taskana-rest-spring-example-common/src/main/java/pro/taskana/example/rest/controllers/ResourcesController.java

@@ -0,0 +1,45 @@
+package pro.taskana.example.rest.controllers;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.util.stream.Collectors;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+
+@Controller
+public class ResourcesController {
+
+  public static final String TASKANA_CUSTOMIZATION_FILE_NAME = "taskana-customization.json";
+
+  @GetMapping(
+      value = "/environments/data-sources/taskana-customization.json",
+      produces = MediaType.APPLICATION_JSON_VALUE)
+  public ResponseEntity<String> taskanaCustomization() throws IOException {
+    return ResponseEntity.ok(readResourceAsString(TASKANA_CUSTOMIZATION_FILE_NAME));
+  }
+
+  // the environment-information.json file will be served via "static" folder
+  //  @GetMapping(
+  //      value = "/environments/data-sources/environment-information.json",
+  //      produces = MediaType.APPLICATION_JSON_VALUE)
+  //  public ResponseEntity<String> environmentInformation() throws Exception {
+  //    return ResponseEntity.ok(readResourceAsString("environment-information.json"));
+  //  }
+
+  private String readResourceAsString(String resource) throws IOException {
+    try (InputStream fileStream = getClass().getResourceAsStream(resource)) {
+      if (fileStream == null) {
+        return "{}";
+      }
+      try (Reader inputStreamReader = new InputStreamReader(fileStream);
+          BufferedReader reader = new BufferedReader(inputStreamReader)) {
+        return reader.lines().collect(Collectors.joining(System.lineSeparator()));
+      }
+    }
+  }
+}