lcbasu · June 17, 2020 01:32 · Jun 12, 2020 · Oct 13, 2019 · Oct 13, 2019 · Oct 13, 2019
diff --git a/application.properties b/application.properties
@@ -1,5 +1,11 @@
 *
-* // first, make data public on Google Cloud
+*
+*
+*
+* // STEP 1: Download Firebase config file and store it as "firebase.json" under the src/main/resources folder
+* // https://support.google.com/firebase/answer/7015592?hl=en
+*
+* // STEP 2: Make data public on Google Cloud
 * // https://cloud.google.com/storage/docs/access-control/making-data-public
 *
 firebase.bucket-name=MY_FIREBASE_PROJECT_BUCKET_NAME

diff --git a/application.properties b/application.properties
@@ -1,5 +1,6 @@
 *
-*
+* // first, make data public on Google Cloud
+* // https://cloud.google.com/storage/docs/access-control/making-data-public
 *
 firebase.bucket-name=MY_FIREBASE_PROJECT_BUCKET_NAME
 firebase.image-url=https://storage.googleapis.com/${firebase.bucket-name}/%s

diff --git a/ImageController.java b/ImageController.java
@@ -0,0 +1,35 @@
+*
+*
+*
+*
+*
+*
+    @Autowired
+    IImageService imageService;
+
+
+    @PostMapping
+    public ResponseEntity create(@RequestParam(name = "file") MultipartFile[] files) {
+
+            for (MultipartFile file : files) {
+
+                try {
+
+                    String fileName = imageService.save(file);
+
+                    String imageUrl = imageService.getImageUrl(fileName);
+
+                    // do whatever you want with that
+
+                } catch (Exception e) {
+                //  throw internal error;
+                }
+            }
+
+        return ResponseEntity.ok().build();
+    }
+*
+*
+*
+*
+*
diff --git a/application.properties b/application.properties
@@ -0,0 +1,8 @@
+*
+*
+*
+firebase.bucket-name=MY_FIREBASE_PROJECT_BUCKET_NAME
+firebase.image-url=https://storage.googleapis.com/${firebase.bucket-name}/%s
+*
+*
+*
diff --git a/FirebaseImageService.java b/FirebaseImageService.java
@@ -0,0 +1,109 @@
+import com.google.auth.oauth2.GoogleCredentials;
+import com.google.cloud.storage.Blob;
+import com.google.cloud.storage.Bucket;
+import com.google.firebase.FirebaseApp;
+import com.google.firebase.FirebaseOptions;
+import com.google.firebase.cloud.StorageClient;
+import lombok.Data;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.event.EventListener;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+
+@Service
+public class FirebaseImageService implements IImageService {
+
+    @Autowired
+    Properties properties;
+
+    @EventListener
+    public void init(ApplicationReadyEvent event) {
+
+        // initialize Firebase
+
+        try {
+
+            ClassPathResource serviceAccount = new ClassPathResource("firebase.json");
+
+            FirebaseOptions options = new FirebaseOptions.Builder()
+                    .setCredentials(GoogleCredentials.fromStream(serviceAccount.getInputStream()))
+                    .setStorageBucket(properties.getBucketName())
+                    .build();
+
+            FirebaseApp.initializeApp(options);
+
+        } catch (Exception ex) {
+
+            ex.printStackTrace();
+
+        }
+    }
+
+    @Override
+    public String getImageUrl(String name) {
+        return String.format(properties.imageUrl, name);
+    }
+
+    @Override
+    public String save(MultipartFile file) throws IOException {
+
+        Bucket bucket = StorageClient.getInstance().bucket();
+
+        String name = generateFileName(file.getOriginalFilename());
+
+        bucket.create(name, file.getBytes(), file.getContentType());
+
+        return name;
+    }
+
+    @Override
+    public String save(BufferedImage bufferedImage, String originalFileName) throws IOException {
+
+        byte[] bytes = getByteArrays(bufferedImage, getExtension(originalFileName));
+
+        Bucket bucket = StorageClient.getInstance().bucket();
+
+        String name = generateFileName(originalFileName);
+
+        bucket.create(name, bytes);
+
+        return name;
+    }
+
+    @Override
+    public void delete(String name) throws IOException {
+
+        Bucket bucket = StorageClient.getInstance().bucket();
+
+        if (StringUtils.isEmpty(name)) {
+            throw new IOException("invalid file name");
+        }
+
+        Blob blob = bucket.get(name);
+
+        if (blob == null) {
+            throw new IOException("file not found");
+        }
+
+        blob.delete();
+    }
+
+    @Data
+    @Configuration
+    @ConfigurationProperties(prefix = "firebase")
+    public class Properties {
+
+        private String bucketName;
+
+        private String imageUrl;
+    }
+
+}
diff --git a/IImageService.java b/IImageService.java
@@ -0,0 +1,47 @@
+import org.springframework.util.StringUtils;
+import org.springframework.web.multipart.MultipartFile;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.UUID;
+
+public interface IImageService {
+
+    String getImageUrl(String name);
+
+    String save(MultipartFile file) throws IOException;
+
+    String save(BufferedImage bufferedImage, String originalFileName) throws IOException;
+
+    void delete(String name) throws IOException;
+
+    default String getExtension(String originalFileName) {
+        return StringUtils.getFilenameExtension(originalFileName);
+    }
+
+    default String generateFileName(String originalFileName) {
+        return UUID.randomUUID().toString() + getExtension(originalFileName);
+    }
+
+    default byte[] getByteArrays(BufferedImage bufferedImage, String format) throws IOException {
+
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+
+        try {
+
+            ImageIO.write(bufferedImage, format, baos);
+
+            baos.flush();
+
+            return baos.toByteArray();
+
+        } catch (IOException e) {
+            throw e;
+        } finally {
+            baos.close();
+        }
+    }
+
+}
diff --git a/pom.xml b/pom.xml
@@ -0,0 +1,25 @@
+*
+*
+*
+*
+*
+        <dependency>
+            <groupId>com.google.firebase</groupId>
+            <artifactId>firebase-admin</artifactId>
+            <version>6.10.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.cloud</groupId>
+            <artifactId>google-cloud-storage</artifactId>
+            <version>1.96.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.api-client</groupId>
+            <artifactId>google-api-client</artifactId>
+            <version>1.30.4</version>
+        </dependency>
+*
+*
+*
+*
+*