Added UserRepository if exists by UserName handler

added corresponding typedefs to User entity class according to commit 5ce5f9 on epq-web
added combined user getMapping for id and name-identified User getters

src/main/java/me/imsonmia/epqapi/controller/UserController.java

@@ -2,14 +2,20 @@ package me.imsonmia.epqapi.controller;
 
 import java.time.Instant;
 import java.util.ArrayList;
+import java.util.Optional;
+
+import javax.swing.text.html.Option;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PatchMapping;
 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.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
 import me.imsonmia.epqapi.model.Message;
@@ -24,32 +30,70 @@ public class UserController {
     private UserRepository userRepository;
     @Autowired
     private MessageRepository messageRepository;
-    @GetMapping("/user/{id}")
-    public User getUserById(@PathVariable(value = "id") Long id) {
-        return userRepository.findById(id).get(); 
+
+    // request URL like .../user?id={number} or .../user?name={string}
+    @GetMapping("/user")
+    public ResponseEntity<User> getUserByParam(@RequestParam(value = "id") Optional<Long> id,
+            @RequestParam(value = "name") Optional<String> name) {
+        if (!id.isPresent()) {
+            if (!name.isPresent()) {
+                // malformed request
+                return ResponseEntity.badRequest().build();
+            } else {
+                // Filter by name branch
+                return ResponseEntity.ok().body(userRepository.findByUserName(name.get()));
+            }
+        } else {
+            // get by id branch
+            return ResponseEntity.ok().body(userRepository.findById(id.get()).get());
+        }
     }
+
     @PostMapping("/user")
-    public User addUser(
-        @RequestBody
-        User newUser
-    ) {
-        return userRepository.save(newUser);
+    public ResponseEntity<Optional<User>> addUser(
+            @RequestBody User newUser) {
+        if (userRepository.existsByUserName(newUser.getUserName())) {
+            return ResponseEntity.badRequest().build();
+        }
+        userRepository.save(newUser);
+        return ResponseEntity.ok().build();
     }
+
     @DeleteMapping("/user/{id}")
-    public void deleteUser(
-        @PathVariable(value = "id") Long id
-    ) {
+    public boolean deleteUser(
+            @PathVariable(value = "id") Long id) {
+        // user doesn't exist
+        if (!userRepository.existsById(id)) {
+            return false;
+        }
         userRepository.deleteById(id);
+        return true;
     }
+
     @GetMapping("/msg/{from}")
     public ArrayList<Message> getMessagesFromTimestamp(@PathVariable(value = "from") Long fromTimestamp) {
+        if (fromTimestamp < 0) {
+            return new ArrayList<>();
+        }
+        ;
         ArrayList<Message> messages = new ArrayList<>();
         Instant targetInstant = Instant.ofEpochMilli(fromTimestamp);
         for (Message msg : messageRepository.findAll()) {
             Instant t = Instant.ofEpochMilli(msg.getTimeMillis());
-            if (t.isBefore(targetInstant)) {continue;}
+            if (t.isBefore(targetInstant)) {
+                continue;
+            }
             messages.add(msg);
         }
         return messages;
     }
+
+    @PatchMapping("/user/{id}")
+    boolean changeUserProperties(@PathVariable(value = "id") Long userId, @RequestBody User newUser) {
+        if (!userRepository.existsById(userId)) {
+            return false;
+        }
+        userRepository.save(newUser);
+        return true;
+    }
 }

src/main/java/me/imsonmia/epqapi/model/User.java

@@ -16,19 +16,29 @@ public class User {
     @Id
     @GeneratedValue(strategy = GenerationType.AUTO)
     @Getter
-    Long    id;
+    Long id;
     @Getter
     @Setter
-    String  userName;
+    String userName;
     @Getter
     @Setter
-    Date    dateJoined;
+    Date dateJoined;
+    @Getter
+    @Setter
+    Date lastSeen;
+    @Getter
+    @Setter
+    String passwordHash;
+
     public User() {
 
     }
-    public User(Long id, String userName, Date dateJoined) {
+
+    public User(Long id, String userName, Date dateJoined, Date lastSeen, String passwordHash) {
         this.id = id;
         this.userName = userName;
         this.dateJoined = dateJoined;
+        this.lastSeen = lastSeen;
+        this.passwordHash = passwordHash;
     }
 }

src/main/java/me/imsonmia/epqapi/repository/UserRepository.java

@@ -6,7 +6,12 @@ import me.imsonmia.epqapi.model.User;
 
 public interface UserRepository extends CrudRepository<User, Long> {
     User findByUserName(String userName);
+
+    boolean existsByUserName(String userName);
 }
 // NOTE timestamp is a reserved SQL keyword
-// create table user (date_joined datetime(6), id bigint not null, user_name varchar(255), primary key (id)) engine=InnoDB
-// create table message (id bigint not null, timestamp bigint, content varchar(255), from varchar(255), to varchar(255), primary key (id)) engine=InnoDB
+// create table user (date_joined datetime(6), id bigint not null, user_name
+// varchar(255), primary key (id)) engine=InnoDB
+// create table message (id bigint not null, timestamp bigint, content
+// varchar(255), from varchar(255), to varchar(255), primary key (id))
+// engine=InnoDB