From 00359147d18c8cb1c5f2ee964c9b6cfaa5fa3685 Mon Sep 17 00:00:00 2001
From: peageon <jinsoo2005@gmail.com>
Date: Tue, 28 May 2024 02:28:18 +0900
Subject: [PATCH] feat: 5MB limit to image and make uploading image optional

---
 .../backend/GlobalExceptionHandler.java       | 10 +++++----
 .../exception/InvalidFileTypeException.java   | 11 ++++++++++
 .../posts/service/GcsFileStorageService.java  | 22 +++++++++++++++++++
 3 files changed, 39 insertions(+), 4 deletions(-)
 create mode 100644 src/main/java/com/runningmate/backend/exception/InvalidFileTypeException.java

diff --git a/src/main/java/com/runningmate/backend/GlobalExceptionHandler.java b/src/main/java/com/runningmate/backend/GlobalExceptionHandler.java
index 1d3b721..6c73e5d 100644
--- a/src/main/java/com/runningmate/backend/GlobalExceptionHandler.java
+++ b/src/main/java/com/runningmate/backend/GlobalExceptionHandler.java
@@ -1,9 +1,6 @@
 package com.runningmate.backend;
 
-import com.runningmate.backend.exception.ErrorMessageResponseDTO;
-import com.runningmate.backend.exception.ExistsConflictException;
-import com.runningmate.backend.exception.FieldExistsException;
-import com.runningmate.backend.exception.ResourceNotFoundException;
+import com.runningmate.backend.exception.*;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.validation.FieldError;
@@ -33,6 +30,11 @@ public ResponseEntity<ErrorMessageResponseDTO> handleResourceNotFoundException(R
         return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(new ErrorMessageResponseDTO(e.getMessage()));
     }
 
+    @ExceptionHandler(InvalidFileTypeException.class)
+    public ResponseEntity<ErrorMessageResponseDTO> handleInvalidFileTypeException(InvalidFileTypeException e) {
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(new ErrorMessageResponseDTO(e.getMessage()));
+    }
+
     @ExceptionHandler(MethodArgumentNotValidException.class)
     public ResponseEntity<Map<String, String>> handleValidationExceptions(MethodArgumentNotValidException e) {
         Map<String, String> errors = new HashMap<>();
diff --git a/src/main/java/com/runningmate/backend/exception/InvalidFileTypeException.java b/src/main/java/com/runningmate/backend/exception/InvalidFileTypeException.java
new file mode 100644
index 0000000..d1b3c23
--- /dev/null
+++ b/src/main/java/com/runningmate/backend/exception/InvalidFileTypeException.java
@@ -0,0 +1,11 @@
+package com.runningmate.backend.exception;
+
+public class InvalidFileTypeException extends RuntimeException{
+    public InvalidFileTypeException(String fileType) {
+        super("Invalid File Type Given: " + fileType);
+    }
+
+    public InvalidFileTypeException(String fileType, String extension) {
+        super("File type of " + fileType + " was given but file's extension is " + extension);
+    }
+}
diff --git a/src/main/java/com/runningmate/backend/posts/service/GcsFileStorageService.java b/src/main/java/com/runningmate/backend/posts/service/GcsFileStorageService.java
index e3edf4f..c8afc56 100644
--- a/src/main/java/com/runningmate/backend/posts/service/GcsFileStorageService.java
+++ b/src/main/java/com/runningmate/backend/posts/service/GcsFileStorageService.java
@@ -4,6 +4,7 @@
 import com.google.auth.oauth2.GoogleCredentials;
 import com.google.cloud.WriteChannel;
 import com.google.cloud.storage.*;
+import com.runningmate.backend.exception.InvalidFileTypeException;
 import org.springframework.stereotype.Service;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.util.ResourceUtils;
@@ -13,10 +14,13 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.ByteBuffer;
+import java.util.Arrays;
+import java.util.List;
 import java.util.UUID;
 
 @Service
 public class GcsFileStorageService {
+    private static final List<String> ACCEPTED_CONTENT_TYPES = Arrays.asList("image/jpeg", "image/png", "image/gif");
 
     @Value("${spring.cloud.gcp.storage.credentials.location}")
     private String keyFileName;
@@ -25,6 +29,10 @@ public class GcsFileStorageService {
     private String bucketName;
 
     public String storeFile(MultipartFile file) throws RuntimeException, IOException {
+        if (!validateFile(file)) {
+            return null;
+        }
+
         InputStream keyFile = ResourceUtils.getURL(keyFileName).openStream();
 
         String fileName = UUID.randomUUID().toString();
@@ -44,4 +52,18 @@ public String storeFile(MultipartFile file) throws RuntimeException, IOException
             throw new RuntimeException("Failed to store file in GCS", e); // throws 500
         }
     }
+
+    private boolean validateFile(MultipartFile file) {
+        if (file == null || file.isEmpty()) {
+            return false;
+        }
+        if (!ACCEPTED_CONTENT_TYPES.contains(file.getContentType())) {
+            throw new InvalidFileTypeException(file.getContentType());
+        }
+        String filename = file.getOriginalFilename();
+        if (filename != null && !filename.toLowerCase().matches(".*\\.(jpg|jpeg|png|gif)$")) {
+            throw new InvalidFileTypeException(file.getContentType(), filename.toLowerCase());
+        }
+        return true;
+    }
 }
\ No newline at end of file