chat endpoints

src/main/java/com/bernd/ChatController.java

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+package com.bernd;
+
+import com.bernd.model.Chat;
+import com.bernd.model.ChatMessage;
+import com.bernd.model.ChatRequest;
+import java.util.Objects;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+@Controller
+public class ChatController {
+
+  final Chats chats;
+
+  ChatController(Chats chats) {
+    this.chats = chats;
+  }
+
+  @ResponseBody
+  @GetMapping("/api/chat/{id}")
+  public Chat getChat(@PathVariable String id) {
+    return chats.get(id);
+  }
+
+  @PostMapping("/api/send_chat")
+  public ResponseEntity<?> sendChat(@RequestBody ChatRequest chatRequest) {
+    Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
+    String user = Objects.toString(principal);
+    chats.put(new Chat(chatRequest.id(), new ChatMessage(chatRequest.message(), user)));
+    return ResponseEntity.ok().build();
+  }
+
+}

src/main/java/com/bernd/Chats.java

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+package com.bernd;
+
+import com.bernd.model.Chat;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import org.springframework.stereotype.Component;
+
+@Component
+public class Chats {
+  private final Map<String, Chat> map = new LinkedHashMap<>();
+
+  Chat get(String id) {
+    return map.get(id);
+  }
+
+  Chat put(Chat chat) {
+    map.put(chat.id(), chat);
+    return chat;
+  }
+
+  List<Chat> chats() {
+    return List.copyOf(map.values());
+  }
+}

src/main/java/com/bernd/model/Chat.java

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+package com.bernd.model;
+
+public record Chat(
+    String id,
+    ChatMessage chatMessage) {
+}

src/main/java/com/bernd/model/ChatMessage.java

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+package com.bernd.model;
+
+public record ChatMessage(
+        String message,
+        String user) {
+}

src/main/java/com/bernd/model/ChatRequest.java

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+package com.bernd.model;
+
+public record ChatRequest(
+        String message,
+        String id) {
+}