Plugin File Open [best] ★

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.

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. plugin file open

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) | plugins/ my-opener/ manifest

// Cleanup void (*on_close)(void* context); FileOpenPluginAPI; "id": "com.example.custom-opener", "version": "1.0.0", "hooks": "file-open": "extensions": [".xyz", ".custom"], "priority": 10, "async": true, "handler": "handlers/file_open.js" "hooks": "file-open": "extensions": [".xyz"

// Called instead of host opening (if plugin handles fully) int (*on_open_file)(const char* path, void* context, char** output_data, size_t* output_size);

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

Define standard return codes: