Set up picture upload mechanism.

codiki-application/src/main/java/org/codiki/application/picture/PictureUseCases.java

@@ -0,0 +1,33 @@
+package org.codiki.application.picture;
+
+import java.io.File;
+import java.util.UUID;
+
+import static org.codiki.domain.picture.model.builder.PictureBuilder.aPicture;
+import org.codiki.domain.picture.model.Picture;
+import org.codiki.domain.picture.port.PicturePort;
+import org.springframework.stereotype.Service;
+
+@Service
+public class PictureUseCases {
+    private final PicturePort picturePort;
+
+    public PictureUseCases(PicturePort picturePort) {
+        this.picturePort = picturePort;
+    }
+
+    public Picture createPicture(File pictureFile) {
+        Picture newPicture = aPicture()
+            .withId(UUID.randomUUID())
+            .withContentFile(pictureFile)
+            .build();
+
+        picturePort.save(newPicture);
+
+        return newPicture;
+    }
+
+    public void deletePicture(UUID pictureId) {
+        picturePort.deleteById(pictureId);
+    }
+}