Interface ElectronShellApi

Triggers a Chromium download for the given URL — the file is saved through the normal "Save As" flow instead of being opened in the renderer.

Security: locked to the renderer's own origin. The scheme, hostname, and port must all match the running app's origin (http://localhost:PORT for the dev server, or the custom trilium-app://app/ protocol for packaged Electron). Cross-origin downloads, hostless URLs (data:, blob:, about:, plain file:///), and unparseable URLs are rejected. This stops a compromised renderer from pre-positioning a remote payload in the user's Downloads folder under a familiar name.

Opens a file with a Trilium-specific custom handler (configured via the "Open With" option), falling back to the OS default if none is set.

Security: the path must resolve to a strict descendant of Trilium's tmp directory and the file must exist on disk. The legitimate caller always passes a path that was just written by saveToTmpDir; anything else (the data dir itself, paths elsewhere on disk, null bytes, empty strings) is rejected.

Opens a URL in the user's default external browser via electron.shell.openExternal.

Security: the scheme is matched against the allowlist in SHELL_OPEN_EXTERNAL_PROTOCOLS (commons). Blocked schemes include file:, data:, smb:, ldap:, ldaps:, jar:, and view-source: — they cover Follina-class RCE primitives (ms-msdt:, search-ms:), NTLM credential theft, and Java loader vectors. URLs that fail to parse are rejected outright.

Opens a file:// URL with its default OS handler. Exists as a separate channel from openExternal because Electron's shell.openExternal mishandles Unicode characters in file: URLs on Windows; converting to a filesystem path and calling shell.openPath works correctly.

Security: the URL must use the file: scheme and must have an empty hostname. UNC paths (file://attacker.example/share/x) are explicitly blocked because Windows would otherwise resolve them to \\attacker.example\share\x and leak the user's NTLM hash via SMB authentication. Drive-letter-as-host malformations like file://C:/path are normalized to file:///C:/path before parsing.

Note: unlike openPath, the resolved path is NOT confined to the Trilium data / tmp directories — this channel handles user-clicked file:// links inside note content, which routinely reference arbitrary locations on disk (file:///C:/Users/me/Documents/contract.pdf and similar). Equivalent to a browser following a file: link the user clicked. Treat clicks on attacker-influenced note content accordingly.

Opens a local path with its default OS handler.

Security: the path is canonicalized and must resolve to either the Trilium data directory (or a descendant) or the Trilium tmp directory (or a descendant). Anything else — absolute paths elsewhere on disk, traversal attempts, UNC paths that don't normalize under those roots — is rejected. Null bytes, empty strings, and non-existent files are also rejected.