codetether-agent 4.7.0-a-002.4

//! Windows Registry browser path lookup — replaces `where.exe` subprocess.
//!
//! Probes the Windows registry `App Paths` keys for Chromium-family browsers,
//! eliminating the need to shell out to `where.exe`.

use super::query;
use std::path::PathBuf;

/// Executable names to look up under
/// `HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\`.
const APP_PATHS: &[&str] = &[
    "chrome.exe",
    "msedge.exe",
    "brave.exe",
    "vivaldi.exe",
    "chromium.exe",
    "opera.exe",
];

/// Query the registry for a Chromium-family browser executable.
///
/// Checks `App Paths` under both `HKLM` and `HKCU`.
pub fn registry_browser_path() -> Option<PathBuf> {
    unsafe { probe_app_paths() }
}

unsafe fn probe_app_paths() -> Option<PathBuf> {
    use windows::Win32::System::Registry::*;
    use windows::core::PCWSTR;

    for name in APP_PATHS {
        let key_path = format!("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\{name}");
        let key_path_w: Vec<u16> = key_path.encode_utf16().chain(std::iter::once(0)).collect();

        let mut hkey = Default::default();
        if unsafe {
            RegOpenKeyExW(
                HKEY_LOCAL_MACHINE,
                PCWSTR(key_path_w.as_ptr()),
                Some(0),
                KEY_READ,
                &mut hkey,
            )
        }
        .is_err()
            && unsafe {
                RegOpenKeyExW(
                    HKEY_CURRENT_USER,
                    PCWSTR(key_path_w.as_ptr()),
                    Some(0),
                    KEY_READ,
                    &mut hkey,
                )
            }
            .is_err()
        {
            continue;
        }

        let path = unsafe { query::read_path_value(hkey) };
        let _ = unsafe { RegCloseKey(hkey) };
        if path.is_some() {
            return path;
        }
    }
    None
}