init

app/storage/s3_backend.py

@@ -0,0 +1,87 @@
+import boto3
+from botocore.exceptions import ClientError
+from typing import BinaryIO
+from app.storage.base import StorageBackend
+from app.config import settings
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+class S3Backend(StorageBackend):
+    """AWS S3 storage backend implementation"""
+
+    def __init__(self):
+        self.s3_client = boto3.client(
+            's3',
+            aws_access_key_id=settings.aws_access_key_id,
+            aws_secret_access_key=settings.aws_secret_access_key,
+            region_name=settings.aws_region
+        )
+        self.bucket_name = settings.s3_bucket_name
+        self._ensure_bucket_exists()
+
+    def _ensure_bucket_exists(self):
+        """Create bucket if it doesn't exist"""
+        try:
+            self.s3_client.head_bucket(Bucket=self.bucket_name)
+        except ClientError as e:
+            error_code = e.response['Error']['Code']
+            if error_code == '404':
+                try:
+                    self.s3_client.create_bucket(
+                        Bucket=self.bucket_name,
+                        CreateBucketConfiguration={'LocationConstraint': settings.aws_region}
+                    )
+                    logger.info(f"Created S3 bucket: {self.bucket_name}")
+                except ClientError as create_error:
+                    logger.error(f"Failed to create bucket: {create_error}")
+                    raise
+
+    async def upload_file(self, file_data: BinaryIO, object_name: str) -> str:
+        """Upload file to S3"""
+        try:
+            self.s3_client.upload_fileobj(file_data, self.bucket_name, object_name)
+            return f"s3://{self.bucket_name}/{object_name}"
+        except ClientError as e:
+            logger.error(f"Failed to upload file to S3: {e}")
+            raise
+
+    async def download_file(self, object_name: str) -> bytes:
+        """Download file from S3"""
+        try:
+            response = self.s3_client.get_object(Bucket=self.bucket_name, Key=object_name)
+            return response['Body'].read()
+        except ClientError as e:
+            logger.error(f"Failed to download file from S3: {e}")
+            raise
+
+    async def delete_file(self, object_name: str) -> bool:
+        """Delete file from S3"""
+        try:
+            self.s3_client.delete_object(Bucket=self.bucket_name, Key=object_name)
+            return True
+        except ClientError as e:
+            logger.error(f"Failed to delete file from S3: {e}")
+            return False
+
+    async def file_exists(self, object_name: str) -> bool:
+        """Check if file exists in S3"""
+        try:
+            self.s3_client.head_object(Bucket=self.bucket_name, Key=object_name)
+            return True
+        except ClientError:
+            return False
+
+    async def get_file_url(self, object_name: str, expiration: int = 3600) -> str:
+        """Generate presigned URL for S3 object"""
+        try:
+            url = self.s3_client.generate_presigned_url(
+                'get_object',
+                Params={'Bucket': self.bucket_name, 'Key': object_name},
+                ExpiresIn=expiration
+            )
+            return url
+        except ClientError as e:
+            logger.error(f"Failed to generate presigned URL: {e}")
+            raise