WIP

[demos/spring/data-jdbc] / src / main / java / de / juplo / kafka / outbox / polling / UserController.java

diff --git a/src/main/java/de/juplo/kafka/outbox/polling/UserController.java b/src/main/java/de/juplo/kafka/outbox/polling/UserController.java
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+package de.juplo.kafka.outbox.polling;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.dao.IncorrectResultSizeDataAccessException;
+import org.springframework.http.ResponseEntity;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.util.StreamUtils;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
+import org.springframework.web.util.UriComponents;
+
+import javax.servlet.http.HttpServletRequest;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.time.LocalDateTime;
+
+import static de.juplo.kafka.outbox.polling.UserEvent.Type.CREATED;
+import static de.juplo.kafka.outbox.polling.UserEvent.Type.DELETED;
+
+
+@RestController
+@Transactional
+@RequestMapping("/users")
+public class UserController {
+
+    private static final Logger LOG = LoggerFactory.getLogger(UserController.class);
+
+
+    private final UserRepository repository;
+    private final ApplicationEventPublisher publisher;
+
+
+    public UserController(
+            UserRepository repository,
+            ApplicationEventPublisher publisher)
+    {
+        this.repository = repository;
+        this.publisher = publisher;
+    }
+
+
+    @PostMapping
+    public ResponseEntity<Void> createUser(
+            ServletUriComponentsBuilder builder,
+            @RequestBody String username) {
+        String sanitizedUsername = UserController.sanitize(username);
+        User user = new User(sanitizedUsername, LocalDateTime.now(), false);
+
+        // Triggering a unique-error for username prevents persistence
+        repository.save(user);
+        publisher.publishEvent(new UserEvent(this, CREATED, sanitizedUsername));
+        user = repository.findByUsername(sanitizedUsername);
+
+        UriComponents uri =
+            builder
+                .fromCurrentRequest()
+                .pathSegment("{username}")
+                .buildAndExpand(sanitizedUsername);
+        return ResponseEntity.created(uri.toUri()).build();
+    }
+
+    @GetMapping("{username}")
+    public ResponseEntity<User> getUser(@PathVariable String username) {
+        User user = repository.findByUsername(UserController.sanitize(username));
+
+        if (user == null)
+            return ResponseEntity.notFound().build();
+
+        return ResponseEntity.ok(user);
+    }
+
+    @DeleteMapping("{username}")
+    public ResponseEntity<User> removeUser(@PathVariable String username) {
+        User user = repository.findByUsername(UserController.sanitize(username));
+
+        if (user == null)
+            return ResponseEntity.notFound().build();
+
+        repository.delete(user);
+        publisher.publishEvent(new UserEvent(this, DELETED, username));
+
+        return ResponseEntity.ok(user);
+    }
+
+    @GetMapping()
+    public ResponseEntity<Iterable<User>> getUsers() {
+        return ResponseEntity.ok(repository.findAll());
+    }
+
+
+    private static String sanitize(String string) {
+        if (string == null)
+            return "";
+
+        return string.trim().toLowerCase();
+    }
+
+    @ExceptionHandler
+    public ResponseEntity<?> incorrectResultSizeDataAccessException(
+        HttpServletRequest request,
+        IncorrectResultSizeDataAccessException e
+        )
+    {
+      String username;
+      try {
+          username = StreamUtils.copyToString(request.getInputStream(), Charset.defaultCharset());
+      }
+      catch (IOException ioe)
+      {
+        username = e.getMessage() + " -> " + ioe.getMessage();
+      }
+      LOG.info("User {} already exists!", username);
+      return ResponseEntity.badRequest().build();
+    }
+}