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### What problem does this PR solve? Closes #15330. RAGFlow had no connector for OneDrive / OneDrive for Business. Users who store working documents in OneDrive could not index them into a knowledge base without manually downloading and re-uploading files. This PR adds a net-new OneDrive data source that: - Authenticates against Microsoft Graph with the same MSAL client-credentials flow already used by the SharePoint and Teams connectors (no new auth primitives). - Enumerates every drive visible to the service principal and pages through `/drives/{id}/root/delta`, persisting `@odata.deltaLink` values per drive so subsequent syncs only fetch changed items. - Optionally narrows ingestion to a sub-folder (`folder_path`) without needing a separate code path. - Surfaces typed errors on the validation probe (`GET /drives?$top=1`): 401 → `ConnectorMissingCredentialError`, 403 → `InsufficientPermissionsError` (with a `Files.Read.All` hint), 5xx → `UnexpectedValidationError`. - Filters folders, soft-deleted items, and unsupported extensions (`.pdf .docx .doc .xlsx .xls .pptx .ppt .txt .md .csv`). #### Files | File | Change | |------|--------| | `common/data_source/onedrive_connector.py` | **New** — `OneDriveConnector` + `OneDriveCheckpoint`. | | `common/data_source/config.py` | `DocumentSource.ONEDRIVE = "onedrive"`. | | `common/constants.py` | `FileSource.ONEDRIVE = "onedrive"`. | | `common/data_source/__init__.py` | Export `OneDriveConnector`. | | `rag/svr/sync_data_source.py` | `OneDrive(SyncBase)` with `batch_size` normalisation; registered in `func_factory`. | | `web/src/pages/user-setting/data-source/constant/index.tsx` | `DataSourceKey.ONEDRIVE`, visibility map (`syncDeletedFiles: true`), info entry, form fields (tenant_id, client_id, client_secret, folder_path, batch_size), default values. | | `web/src/locales/en.ts`, `web/src/locales/zh.ts` | `onedriveDescription` + 4 tooltip keys (EN + ZH). | | `test/unit_test/data_source/test_onedrive_connector_unit.py` | **New** — 13 unit tests (`p1`/`p2`) covering auth, validation, checkpoint helpers, and document filtering. | #### Required Azure AD permission `Files.Read.All` (Application, admin-granted). #### Out of scope - Interactive end-user OAuth (delegated permissions) — the connector uses app-only credentials, consistent with the SharePoint / Teams precedent. - Binary download of file contents — the sync layer emits `Document`s carrying `webUrl` + metadata; bytes are hydrated downstream by the parse pipeline. ### Type of change - [x] New Feature (non-breaking change which adds functionality)