Fixed a bug

src/main/java/com/ceticamarco/bits/post/Post.java

@@ -45,6 +45,8 @@ public class Post {
 
     public String getContent() { return this.content; }
 
+    public LocalDate getExpirationDate() { return this.expirationDate; }
+
     public User getUser() { return this.user; }
 
     public void setUser(User user) { this.user = user; }

src/main/java/com/ceticamarco/bits/post/PostController.java

@@ -2,6 +2,8 @@ package com.ceticamarco.bits.post;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializationFeature;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import jakarta.validation.Valid;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
@@ -61,8 +63,28 @@ public class PostController {
      * @return the content of the post
      */
     @GetMapping("/posts/{postId}")
-    public String getPost(@PathVariable("postId") Integer postId) {
-        return "";
+    public ResponseEntity<String> getPost(@PathVariable("postId") String postId) {
+        var objectMapper = new ObjectMapper();
+        objectMapper.registerModule(new JavaTimeModule());
+        objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
+        var res = postService.getPost(postId).map(post -> {
+            try {
+                return objectMapper.writeValueAsString(post);
+            } catch(JsonProcessingException e) {
+                throw new RuntimeException(e.getMessage());
+            }
+        }).swap().map(error -> {
+            try {
+                var jsonNode = objectMapper.createObjectNode().put("error", error.getMessage());
+                return objectMapper.writeValueAsString(jsonNode);
+            } catch(JsonProcessingException e) {
+                throw new RuntimeException(e.getMessage());
+            }
+        }).swap();
+
+        return res.isRight()
+                ? new ResponseEntity<>(res.get(), HttpStatus.OK)
+                :  new ResponseEntity<>(res.getLeft(), HttpStatus.BAD_REQUEST);
     }
 
     /**

src/main/java/com/ceticamarco/bits/post/PostService.java

@@ -8,6 +8,7 @@ import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.stereotype.Service;
 
 import java.time.LocalDate;
+import java.util.Optional;
 
 @Service
 public class PostService {
@@ -30,6 +31,24 @@ public class PostService {
         return encodedPassword.filter(s -> passwordEncoder.matches(rawPassword, s)).isPresent();
     }
 
+    Either<Error, Post> getPost(String postId) {
+        Optional<Post> post = postRepository.findById(postId);
+
+        // Check whether the post exists or not
+        if(post.isEmpty()) {
+            return Either.left(new Error("Cannot find post"));
+        }
+
+        // Conceal personal user information if available
+        if(post.get().getUser() != null) {
+            post.get().getUser().setId(null);
+            post.get().getUser().setPassword(null);
+        }
+
+        return Either.right(post.get());
+
+    }
+
     Either<Error, String> addNewPost(Post post) {
         // Check whether the user email and user password are specified
         if(post.getUser() != null && post.getUser().getEmail() != null && post.getUser().getPassword() != null) {

src/main/java/com/ceticamarco/bits/user/User.java

@@ -37,6 +37,8 @@ public class User {
 
     public User() {}
 
+    public String getId() { return this.id; }
+
     public String getEmail() { return this.email; }
 
     public String getUsername() { return this.username; }
@@ -45,5 +47,5 @@ public class User {
 
     public void setPassword(String password) { this.password = password; }
 
-    public String getId() { return this.id; }
+    public void setId(String id) { this.id = id; }
 }

src/main/java/com/ceticamarco/bits/user/UserController.java

@@ -52,9 +52,9 @@ public class UserController {
     @PostMapping("/users")
     public ResponseEntity<String> submitUser(@Valid @RequestBody User user) {
         var objectMapper = new ObjectMapper();
-        var res = userService.addNewUser(user).map(user_id -> {
+        var res = userService.addNewUser(user).map(userId -> {
             try {
-                var jsonNode = objectMapper.createObjectNode().put("user_id", user_id);
+                var jsonNode = objectMapper.createObjectNode().put("user_id", userId);
                 return objectMapper.writeValueAsString(jsonNode);
             } catch(JsonProcessingException e) {
                 throw new RuntimeException(e.getMessage());

src/main/java/com/ceticamarco/bits/user/UserService.java

@@ -26,7 +26,7 @@ public class UserService {
 
         // If they are found, return an error
         if(userEmail.isPresent() || userName.isPresent()) {
-            return Either.left(new Error("Email or username already taken."));
+            return Either.left(new Error("Email or username already taken"));
         }
 
         // Hash the password
@@ -47,13 +47,13 @@ public class UserService {
 
         // Check whether user exists
         if(encodedPassword.isEmpty()) {
-            return Optional.of(new Error("Cannot find user."));
+            return Optional.of(new Error("Cannot find user"));
         }
 
         // Otherwise compare the hash
         var isHashEqual = passwordEncoder.matches(rawPassword, encodedPassword.get());
         if(!isHashEqual) {
-            return Optional.of(new Error("Wrong password."));
+            return Optional.of(new Error("Wrong password"));
         }
 
         userRepository.deleteUserByEmail(user.getEmail());