Plugin File Open -

plugins/ my-opener/ manifest.json bin/ plugin.dll (or .so) resources/ logs/ This write-up gives you a blueprint to implement a secure, extensible file open handler in a plugin system. Adjust the API style (C, C++, Python, Rust) to match your host application.

Define standard return codes:

// Called after host opens file void (*on_after_file_open)(const char* path, void* context, int host_result); plugin file open

Step 1: Plugin Registration PluginManager::register_file_handler( plugin_id, FileOpenFlags::CAN_HANDLE_EXTENSION | FileOpenFlags::ASYNC, ".xyz", ".abc", &my_file_open_callback ); Step 2: Host Invocation Logic def host_open_file(filepath): handlers = plugin_mgr.get_matching_handlers(filepath) handlers.sort(key=lambda h: h.priority, reverse=True) for handler in handlers: result = handler.before_open(filepath) if result.action == "HANDLE_FULLY": data = handler.open(filepath) return data elif result.action == "MODIFY_PATH": filepath = result.new_path plugins/ my-opener/ manifest

1. Overview Purpose: Allow a host application (e.g., editor, IDE, media player, game engine) to open external files via a plugin system. The plugin registers a custom file open handler to intercept or extend the application’s native file opening behavior. Overview Purpose: Allow a host application (e

def decrypt(self, data): # custom decryption logic return xor_cipher(data, key='secret') | Threat | Mitigation | |--------|-------------| | Path traversal (../../etc/passwd) | Sanitize and canonicalize paths; reject if outside allowed roots | | Plugin crash crashing host | Run plugin in separate process or sandbox (e.g., WASM, Lua sandbox) | | Malicious plugin reading arbitrary files | Enforce capability-based permissions: allow_paths=["/data/project/*"] | | Symlink attacks | Use realpath() and verify file ownership/permissions before open | | Recursive plugin calls | Set a recursion guard (max depth = 3) |