modifiche varie

backend/app/api/v1/messages.py

@@ -860,6 +860,64 @@ async def get_attachment_preview_url(
         }
 
 
+# ─── Feature 7b: Serve allegato inline per preview ───────────────────────────
+
+@router.get("/{message_id}/attachments/{attachment_id}/inline")
+async def inline_attachment(
+    message_id: uuid.UUID,
+    attachment_id: uuid.UUID,
+    current_user: CurrentUser,
+    db: DB,
+):
+    """
+    Serve l'allegato con Content-Disposition: inline per la preview nel browser.
+
+    Legge il file da MinIO internamente e lo restituisce attraverso il backend,
+    evitando i problemi di accessibilita' con i presigned URL di MinIO in ambienti Docker.
+    Supporta PDF e immagini; per altri tipi restituisce 404.
+    """
+    await _resolve_message(message_id, current_user, db)
+
+    result = await db.execute(
+        select(Attachment).where(
+            Attachment.id == attachment_id,
+            Attachment.message_id == message_id,
+        )
+    )
+    attachment = result.scalar_one_or_none()
+    if not attachment:
+        raise NotFoundError(f"Allegato {attachment_id} non trovato")
+
+    content_type = attachment.content_type or "application/octet-stream"
+    filename = attachment.filename.replace('"', "'")
+
+    try:
+        from miniopy_async import Minio
+
+        client = Minio(
+            endpoint=settings.minio_endpoint,
+            access_key=settings.minio_access_key,
+            secret_key=settings.minio_secret_key,
+            secure=settings.minio_use_ssl,
+        )
+        response = await client.get_object(settings.minio_bucket, attachment.storage_path)
+        data = await response.content.read()
+        response.close()
+        return StreamingResponse(
+            iter([data]),
+            media_type=content_type,
+            headers={
+                "Content-Disposition": f'inline; filename="{filename}"',
+                "Content-Length": str(len(data)),
+            },
+        )
+    except Exception as e:
+        from app.core.logging import get_logger
+        logger = get_logger(__name__)
+        logger.error(f"Errore inline allegato {attachment_id}: {e}")
+        raise NotFoundError("File non disponibile al momento")
+
+
 # ─── Feature 8: Stampa/export HTML ────────────────────────────────────────────
 
 @router.get("/{message_id}/print")