feat: repository architecture for files crate w. added tests (#498)

crates/core/files/tests/integration_test.rs

@@ -0,0 +1,31 @@
+use std::io::Cursor;
+
+use revolt_files::{EncryptionKey, FileStorageRepository, MediaImpl, MediaRepository, S3Storage};
+
+#[tokio::test]
+async fn test_image_roundtrip_png() {
+    let media = MediaImpl::from_config().await;
+    let encryption = EncryptionKey::from_config().await;
+    let s3 = S3Storage::from_config(encryption).await;
+
+    let buf = include_bytes!("./assets/test.png");
+    let bucket_id = uuid::Uuid::new_v4().to_string();
+
+    s3.create_bucket(&bucket_id).await.unwrap();
+
+    let mut reader = Cursor::new(buf);
+    media.decode_image(&mut reader, "image/png").unwrap();
+
+    let iv = s3
+        .encrypt_and_upload_file(&bucket_id, "/my-file", buf)
+        .await
+        .unwrap();
+
+    let buf = s3
+        .fetch_and_decrypt_file(&bucket_id, "/my-file", &iv)
+        .await
+        .unwrap();
+
+    let mut reader = Cursor::new(buf);
+    media.decode_image(&mut reader, "image/png").unwrap();
+}