[New Feature] Rest API implementation to showcase the OpenDBM features

rest_api/app/services/file/file.py

@@ -0,0 +1,53 @@
+import os
+import shutil
+from fastapi import UploadFile
+import boto3
+
+from schemas.file_properties import FileProperties
+from services.file.i_file import FileService
+
+AWS_ACCESS_KEY = os.getenv('AWS_ACCESS_KEY', 'DUMMY_KEY')
+AWS_SECRET_KEY = os.getenv('AWS_SECRET_KEY', 'DUMMY_SECRET')
+S3_BUCKET_NAME = 'odbm-test'
+
+def get_file_service(platform:str) -> FileService:
+    if platform.lower() == 's3':
+        return S3FileService()
+    else:
+        return MemoryFileService()
+
+
+client = boto3.client(
+    's3',
+    aws_access_key_id=AWS_ACCESS_KEY,
+    aws_secret_access_key=AWS_SECRET_KEY
+)
+
+s3 = boto3.resource(
+    's3',
+    aws_access_key_id=AWS_ACCESS_KEY,
+    aws_secret_access_key=AWS_SECRET_KEY
+)
+
+class S3FileService(FileService):
+    def upload(self, file_properties: FileProperties, file: UploadFile):
+        print(AWS_ACCESS_KEY)
+        print(AWS_SECRET_KEY)
+        s3 = boto3.resource("s3")
+        bucket = s3.Bucket(S3_BUCKET_NAME)
+        bucket.upload_fileobj(file.file, file.filename, ExtraArgs={"ACL": "public-read"})
+        uploaded_file_url = f"https://{S3_BUCKET_NAME}.s3.amazonaws.com/{file.filename}"
+        return {"returnUrl": uploaded_file_url}
+
+    def download(file_properties: FileProperties):
+        pass
+
+class MemoryFileService(FileService):
+    def upload(self, file_properties: FileProperties, file: UploadFile):
+        file_location = f"files/{file.filename}"
+        with open(file_location, "wb+") as file_object:
+            shutil.copyfileobj(file.file, file_object)    
+        return {"info": f"file '{file.filename}' saved at '{file_location}'"}
+
+    def download(file_properties: FileProperties):
+        pass

rest_api/app/services/file/i_file.py

@@ -0,0 +1,13 @@
+from fastapi import UploadFile
+from abc import ABCMeta, abstractmethod
+from schemas.file_properties import FileProperties
+
+
+class FileService:
+    __metaclass__ = ABCMeta
+
+    @abstractmethod
+    def upload(file_properties: FileProperties, file: UploadFile): raise NotImplementedError
+
+    @abstractmethod
+    def download(file_properties: FileProperties): raise NotImplementedError