src/cmd/folders.rs


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use std::collections::BTreeSet;
use std::ffi::{OsStr, OsString};
use std::path::{Path, PathBuf};
use std::sync::LazyLock;

use protobuf::Message as _;

use crate::error::Result;
use crate::pb3::jwebmail::{FoldersReq, FoldersResp};

static REQUIRED_MAILDIR_DIRS: LazyLock<BTreeSet<OsString>> = LazyLock::new(|| {
    [
        OsString::from("cur"),
        "new".into(),
        "tmp".into(),
        "maildirfolder".into(),
    ]
    .into()
});

fn is_mailsubdir(p: &Path) -> bool {
    p.is_dir()
        && p.file_name()
            .map_or(false, |fname| fname.to_string_lossy().starts_with('.'))
        && p.read_dir()
            .map(|dir| {
                dir.filter_map(|child| {
                    child
                        .ok()
                        .and_then(|dir_entry| dir_entry.path().file_name().map(OsStr::to_owned))
                })
                .collect::<BTreeSet<_>>()
                .is_superset(&*REQUIRED_MAILDIR_DIRS)
            })
            .unwrap_or_default()
}

pub fn folders(path: PathBuf, req: &[u8]) -> Result<Vec<u8>> {
    let _ = FoldersReq::parse_from_bytes(req)?;

    let subdirs = path
        .read_dir()?
        .filter_map(|d| d.ok())
        .filter(|d| is_mailsubdir(&d.path()))
        .filter_map(|d| Some(d.path().file_name()?.to_string_lossy()[1..].to_owned()))
        .collect();

    let mut res = FoldersResp::new();
    res.folders = subdirs;
    res.write_to_bytes().map_err(|e| e.into())
}