feat(backup): wrapper de stockage S3 (boto3) + faux stockage de test (#89)

tests/backup/fakes.py

@@ -0,0 +1,15 @@
+class FakeStorage:
+    def __init__(self):
+        self.objects: dict[str, bytes] = {}
+
+    def upload_bytes(self, key, data):
+        self.objects[key] = data
+
+    def download_bytes(self, key):
+        return self.objects[key]
+
+    def list_keys(self, prefix):
+        return [k for k in self.objects if k.startswith(prefix)]
+
+    def delete(self, key):
+        self.objects.pop(key, None)

tests/backup/test_storage_s3.py

@@ -0,0 +1,31 @@
+import boto3
+import pytest
+from moto import mock_aws
+
+from src.backup.storage import S3Storage
+
+BUCKET = "decp-backups"
+
+
+@pytest.fixture
+def s3_storage():
+    with mock_aws():
+        boto3.client("s3", region_name="us-east-1").create_bucket(Bucket=BUCKET)
+        yield S3Storage(
+            bucket=BUCKET,
+            endpoint_url=None,
+            access_key="testing",
+            secret_key="testing",
+        )
+
+
+def test_upload_list_download_delete(s3_storage):
+    s3_storage.upload_bytes("backups/a.enc", b"alpha")
+    s3_storage.upload_bytes("backups/b.enc", b"beta")
+    s3_storage.upload_bytes("autre/c.enc", b"gamma")
+
+    assert set(s3_storage.list_keys("backups/")) == {"backups/a.enc", "backups/b.enc"}
+    assert s3_storage.download_bytes("backups/a.enc") == b"alpha"
+
+    s3_storage.delete("backups/a.enc")
+    assert s3_storage.list_keys("backups/") == ["backups/b.enc"]