Add live-server harness; centralise the rustls provider install
Adds a read-only example that exercises the connector against a real Nextcloud: Login Flow v2, PROPFIND listing, the Depth:0 ETag pruning probe, a 256KB range GET, and a server preview request. No PUT, MOVE or DELETE, so it cannot alter a live library. Running it against nextcloud.tourolle.paris (34.0.2) surfaced a real API flaw rather than an example bug. The crypto provider was installed in NextcloudBackend::new, but authentication necessarily runs *before* a backend exists — so any caller following the documented flow panicked on the first client build. Every entry point now goes through `http_client()`, which installs the provider first, and auth gains `begin_default()` for callers with no client yet. A test builds a client without a backend to keep the regression out. Also populates RawImage::crop from rawler's crop_area/active_area and re-phases the CFA pattern when the crop origin is odd — cropping to the active area without that swaps red and blue. Login Flow v2 confirmed working against the live server: the flow URL is issued and the poll endpoint responds. The remaining checks need a browser approval, so they run interactively. 88 tests passing.
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//! Exercise the connector against a real Nextcloud server.
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//!
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//! ```text
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//! cargo run -p dr-sync-nextcloud --example connect -- https://cloud.example [remote/path]
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//! ```
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//!
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//! **Strictly read-only.** PROPFIND, ETag probes, range GETs and preview
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//! requests only — no PUT, MOVE or DELETE — so it cannot alter a live library.
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//!
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//! Authentication uses Login Flow v2 (FR-NC-1): the app never sees a password.
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//! A URL is printed for the browser, and the resulting app password is
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//! device-scoped and revocable from the server's security settings.
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//!
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//! Credentials are cached under `$XDG_CACHE_HOME/darkroom/` so repeat runs do
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//! not re-authenticate. That location is for *testing convenience* only;
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//! FR-NC-2 requires the real app to use platform secure storage.
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use std::path::PathBuf;
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use std::time::Instant;
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use dr_sync::{RemoteBackend, RemoteId, RemotePath, SyncStrategy};
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use dr_sync_nextcloud::{auth, AppCredentials, NextcloudBackend};
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#[tokio::main]
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async fn main() {
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env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();
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let mut args = std::env::args().skip(1);
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let Some(server) = args.next() else {
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eprintln!("usage: connect <server-url> [remote/path]");
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std::process::exit(2);
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};
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let start_path = args.next().unwrap_or_default();
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let creds = match load_cached(&server) {
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Some(c) => {
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println!("using cached credentials for {}", c.login_name);
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c
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}
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None => match authenticate(&server).await {
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Ok(c) => c,
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Err(e) => {
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eprintln!("authentication failed: {e}");
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std::process::exit(1);
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}
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},
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};
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// The DAV base needs the *user id*, which may differ from the login name
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// (a login can be an email address). OCS reports the real one.
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let user_id = fetch_user_id(&creds).await.unwrap_or_else(|e| {
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eprintln!("could not resolve user id ({e}); falling back to login name");
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creds.login_name.clone()
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});
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println!("user id: {user_id}");
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let backend = NextcloudBackend::new(&creds, &user_id).expect("build backend");
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println!("\nbackend: {}", backend.name());
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let caps = backend.capabilities();
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let strategy = SyncStrategy::for_capabilities(caps);
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println!("strategy: {} ({:?})", strategy.describe(), strategy);
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println!("cheap no-op sync: {}", strategy.has_cheap_noop());
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let root = RemotePath::new(&start_path);
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let mut failures = 0;
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// ---- 1. listing ----------------------------------------------------
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println!("\n[1] PROPFIND Depth:1 on /{start_path}");
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let t = Instant::now();
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let entries = match backend.list(&root, None).await {
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Ok(e) => {
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println!(
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" {} entries in {:.0}ms",
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e.len(),
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t.elapsed().as_secs_f64() * 1000.0
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);
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e
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}
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Err(e) => {
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println!(" FAILED: {e}");
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failures += 1;
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Vec::new()
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}
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};
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for e in entries.iter().take(5) {
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println!(
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" {:?} {:<40} {:>10} id={:?}{}",
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e.kind,
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truncate(e.path.name(), 40),
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human(e.size),
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e.id,
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if e.has_preview { " preview" } else { "" }
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);
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}
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if entries.len() > 5 {
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println!(" … {} more", entries.len() - 5);
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}
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// ---- 2. the pruning probe ------------------------------------------
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println!("\n[2] PROPFIND Depth:0 — the ETag pruning probe (FR-NC-4)");
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let t = Instant::now();
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match backend.dir_validator(&root).await {
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Ok(v) => println!(
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" etag {} in {:.0}ms — one request proves the tree unchanged",
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v.as_str(),
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t.elapsed().as_secs_f64() * 1000.0
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),
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Err(e) => {
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println!(" FAILED: {e}");
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failures += 1;
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}
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}
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// ---- 3. range read -------------------------------------------------
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// The mechanism the whole mobile story rests on (FR-NC-3).
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let file = entries
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.iter()
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.find(|e| e.kind == dr_sync::EntryKind::File && e.size > 300_000);
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if let Some(f) = file {
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println!(
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"\n[3] Range GET — first 256KB of {} ({})",
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f.path.name(),
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human(f.size)
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);
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let id = RemoteId::Path(f.path.clone());
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let t = Instant::now();
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match backend.get(&id, Some(0..262_144)).await {
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Ok(bytes) => {
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let ms = t.elapsed().as_secs_f64() * 1000.0;
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let pct = (bytes.len() as f64 / f.size as f64) * 100.0;
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println!(
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" got {} in {ms:.0}ms ({pct:.1}% of the file)",
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human(bytes.len() as u64)
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);
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if bytes.len() as u64 >= f.size {
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println!(" WARNING: whole file returned — server ignored Range");
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failures += 1;
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} else {
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println!(" range requests work — remote browsing is viable");
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}
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if let Some(fmt) = dr_decode::probe(&bytes) {
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println!(" probe: {fmt:?}");
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}
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match dr_decode::metadata(&bytes) {
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Ok(m) => println!(
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" metadata from the range alone: {} {}",
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m.make.unwrap_or_default(),
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m.model.unwrap_or_default()
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),
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Err(e) => println!(" metadata: {e}"),
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}
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}
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Err(e) => {
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println!(" FAILED: {e}");
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failures += 1;
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}
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}
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// ---- 4. server preview ------------------------------------------
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println!("\n[4] Server preview (ARCH §6.7 expects none for RAW)");
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match backend.thumbnail(&f.id, 256).await {
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Ok(Some(b)) => println!(" {} returned", human(b.len() as u64)),
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Ok(None) => println!(" none — as expected; local extraction is the path"),
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Err(e) => println!(" error: {e}"),
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}
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} else {
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println!("\n[3] skipped — no file over 300KB at this path");
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}
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println!(
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"\n{}",
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if failures == 0 {
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"all checks passed"
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} else {
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"FAILURES"
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}
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);
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if failures > 0 {
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std::process::exit(1);
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}
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}
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async fn authenticate(server: &str) -> Result<AppCredentials, String> {
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let client =
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dr_sync_nextcloud::http_client("DarkRoom (connect example)").map_err(|e| e.to_string())?;
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let flow = auth::begin(&client, server, "DarkRoom (connect example)")
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.await
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.map_err(|e| e.to_string())?;
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println!("\n Open this in a browser and approve:\n");
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println!(" {}\n", flow.login_url);
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println!(" waiting (20 minute limit)…");
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let creds = auth::poll(&client, &flow)
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.await
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.map_err(|e| e.to_string())?;
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println!(" authenticated as {}", creds.login_name);
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save_cached(server, &creds);
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Ok(creds)
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}
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/// Resolve the real user id, which the DAV path needs.
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async fn fetch_user_id(creds: &AppCredentials) -> Result<String, String> {
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let client = dr_sync_nextcloud::http_client("DarkRoom").map_err(|e| e.to_string())?;
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let url = format!(
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"{}/ocs/v2.php/cloud/user?format=json",
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creds.server.trim_end_matches('/')
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);
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let body = client
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.get(&url)
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.basic_auth(&creds.login_name, Some(&creds.app_password))
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.header("OCS-APIRequest", "true")
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.send()
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.await
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.map_err(|e| e.to_string())?
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.text()
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.await
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.map_err(|e| e.to_string())?;
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let v: serde_json::Value = serde_json::from_str(&body).map_err(|e| e.to_string())?;
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v["ocs"]["data"]["id"]
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.as_str()
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.map(str::to_string)
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.ok_or_else(|| "no id in OCS response".to_string())
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}
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fn cache_path(server: &str) -> PathBuf {
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let dir = std::env::var_os("XDG_CACHE_HOME")
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.map(PathBuf::from)
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.unwrap_or_else(|| PathBuf::from(std::env::var("HOME").unwrap_or_default()).join(".cache"))
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.join("darkroom");
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let _ = std::fs::create_dir_all(&dir);
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let key: String = server
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.chars()
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.map(|c| if c.is_alphanumeric() { c } else { '_' })
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.collect();
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dir.join(format!("{key}.json"))
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}
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fn load_cached(server: &str) -> Option<AppCredentials> {
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let text = std::fs::read_to_string(cache_path(server)).ok()?;
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serde_json::from_str(&text).ok()
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}
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fn save_cached(server: &str, creds: &AppCredentials) {
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let path = cache_path(server);
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if let Ok(json) = serde_json::to_string(creds) {
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let _ = std::fs::write(&path, json);
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// Testing convenience only — FR-NC-2 requires platform secure storage.
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#[cfg(unix)]
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{
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use std::os::unix::fs::PermissionsExt;
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let _ = std::fs::set_permissions(&path, std::fs::Permissions::from_mode(0o600));
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}
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println!(" cached credentials at {}", path.display());
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}
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}
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fn human(bytes: u64) -> String {
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match bytes {
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b if b >= 1_000_000_000 => format!("{:.1}GB", b as f64 / 1e9),
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b if b >= 1_000_000 => format!("{:.1}MB", b as f64 / 1e6),
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b if b >= 1_000 => format!("{:.0}KB", b as f64 / 1e3),
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b => format!("{b}B"),
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}
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}
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fn truncate(s: &str, n: usize) -> String {
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if s.chars().count() <= n {
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s.to_string()
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} else {
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format!("{}…", s.chars().take(n - 1).collect::<String>())
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}
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}
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