dovenest

pim.rs

1	//! CalDAV and CardDAV.
2	//!
3	//! URL layout under [`PIM`]:
4	//!
5	//! * `/principals/` and `/principals/{name}/`: accounts, rooms and resources
6	//! * `/calendars/{name}/` and `/addressbooks/{name}/`, the homes
7	//! * `/calendars/{name}/{collection}/` and `.../{collection}/{object}`, the
8	//! same for address books
9	//!
10	//! A home also shows the collections lent to its account, as
11	//! `shared-{collection id}`, and the address book home shows the generated
12	//! system address book as `system`. The calendar home holds the scheduling
13	//! `inbox` and `outbox`, and the generated `birthdays` calendar. A room's home
14	//! holds its bookings.
15	//!
16	//! The protocol logic is `pimdav`'s. This module authenticates, maps URLs onto
17	//! the store and assembles the responses.
18
19	use std::collections::HashSet;
20	use std::sync::Arc;
21
22	use api_types::PIM;
23	use axum::body::Body;
24	use axum::extract::State;
25	use axum::http::header::{ALLOW, CONTENT_LENGTH, CONTENT_TYPE, ETAG, LOCATION};
26	use axum::http::{HeaderMap, HeaderValue, Method, Request, Response, StatusCode};
27	use axum::response::IntoResponse;
28	use percent_encoding::{
29	AsciiSet, CONTROLS, NON_ALPHANUMERIC, percent_decode_str, utf8_percent_encode,
30	};
31	use pimdav::calcard::icalendar::ICalendar;
32	use pimdav::calcard::vcard::VCard;
33	use pimdav::principal::{self, Principal, Search, UserType};
34	use pimdav::render::{self, TooManyInstances};
35	use pimdav::report::{self, Props, Refused, Report};
36	use pimdav::xml::{
37	self, APPLE, CALDAV, CALSERVER, CARDDAV, DAV, Name, Propfind, Update, el, hrefs, with_attr,
38	with_children, with_text,
39	};
40	use pimdav::zone::{self, Zone};
41	use pimdav::{contact, filter, freebusy, object};
42
43	use super::common::{blocking, href_path};
44	use super::pim_schedule::{self, Directory, Writer};
45	use sha2::{Digest, Sha256};
46	use xmltree::Element;
47
48	use crate::db::{
49	DeadProp, PimCollection, PimKind, PimObject, PimOp, PimPrincipal, PimShareMode, PimWrite,
50	Precondition, PropPlace, User,
51	};
52	use crate::error::{ApiError, AppState};
53
54	/// Largest object a PUT may store. Contacts carry photos inline.
55	pub(super) const MAX_RESOURCE_SIZE: usize = 10 * 1024 * 1024;
56
57	const MAX_SLUG: usize = 255;
58	pub(super) const MAX_COLLECTIONS: usize = 100;
59	pub(super) const MAX_DISPLAYNAME: usize = 256;
60	pub(super) const MAX_DESCRIPTION: usize = 1024;
61
62	/// A trimmed name (`lines` false) or description within `max` characters.
63	pub(super) fn valid_text(v: &str, max: usize, lines: bool) -> bool {
64	let v = v.trim();
65	v.chars().count() <= max
66	&& !v
67	.chars()
68	.any(\|c\| c.is_control() && !(lines && matches!(c, '\n' \| '\r' \| '\t')))
69	}
70
71	/// Largest XML request body.
72	const MAX_XML_SIZE: usize = 1024 * 1024;
73
74	/// Largest client property the server stores without interpreting it, and
75	/// the most one resource may hold. The total, `calendar-timezone` included,
76	/// bounds what a PROPFIND of a home returns.
77	const MAX_DEAD_SIZE: usize = 64 * 1024;
78	const MAX_DEAD_PROPS: usize = 100;
79	const MAX_DEAD_TOTAL: usize = 256 * 1024;
80
81	/// The domain of the addresses users schedule with. `.invalid` is reserved
82	/// (RFC 2606), so nothing sent there can reach anyone.
83	pub(super) const MAIL_DOMAIN: &str = "dovenest.invalid";
84
85	/// The ids of the generated collections, which no stored one has.
86	pub(super) const DIRECTORY: i64 = 0;
87	pub(super) const BIRTHDAYS: i64 = -1;
88	pub(super) const DIRECTORY_SLUG: &str = "system";
89	pub(super) const BIRTHDAYS_SLUG: &str = "birthdays";
90	/// The slug prefix of a collection lent to the account.
91	pub(super) const SHARED_PREFIX: &str = "shared-";
92	/// The scheduling inbox is a stored calendar collection under this slug.
93	pub(crate) const INBOX: &str = "inbox";
94	/// The scheduling outbox holds nothing and is not stored.
95	pub(crate) const OUTBOX: &str = "outbox";
96
97	/// Characters escaped in an href segment.
98	const SEGMENT: &AsciiSet = &CONTROLS
99	.add(b' ')
100	.add(b'"')
101	.add(b'#')
102	.add(b'%')
103	.add(b'/')
104	.add(b'<')
105	.add(b'>')
106	.add(b'?')
107	.add(b'[')
108	.add(b']')
109	.add(b'`')
110	.add(b'{')
111	.add(b'}');
112
113	/// Characters a principal name keeps in the local part of its address. The
114	/// rest is percent-encoded: `%` is valid there, `@` and spaces are not
115	/// (RFC 5322, 3.2.3).
116	const LOCAL: &AsciiSet = &NON_ALPHANUMERIC.remove(b'-').remove(b'_').remove(b'.');
117	/// The same without the dot, for names where a dot would lead, trail or
118	/// repeat.
119	const LOCAL_NO_DOT: &AsciiSet = &LOCAL.add(b'.');
120
121	type Reply = Result<Response<Body>, ApiError>;
122
123	/// Up to this many responses a PROPFIND answer is built in place. Larger ones
124	/// go to the blocking pool, so they do not stall the async workers.
125	const INLINE_RESPONSES: usize = 64;
126
127	/// `{WELL_KNOWN_CALDAV}` and `{WELL_KNOWN_CARDDAV}`.
128	///
129	/// 307, not 301: HTTP clients drop the body on a 301, and python-caldav sends
130	/// its principal search to the URL it was configured with.
131	pub async fn well_known() -> Response<Body> {
132	(
133	StatusCode::TEMPORARY_REDIRECT,
134	[(LOCATION, format!("{PIM}/"))],
135	)
136	.into_response()
137	}
138
139	/// The `DAV` header of every response here. Apple Calendar looks for it on
140	/// PROPFIND responses too, not only on OPTIONS.
141	pub(super) const COMPLIANCE: &str =
142	"1, 3, access-control, calendar-access, calendar-auto-schedule, addressbook, extended-mkcol";
143
144	/// `{PIM}` and everything under it.
145	pub async fn handle(State(state): State<Arc<AppState>>, req: Request<Body>) -> Response<Body> {
146	let mut r = match super::dav::authenticate(&state, req.headers()).await {
147	Some((user_id, _)) => serve(&state, user_id, req)
148	.await
149	.unwrap_or_else(IntoResponse::into_response),
150	None => super::dav::challenge(),
151	};
152	r.headers_mut()
153	.insert("dav", axum::http::HeaderValue::from_static(COMPLIANCE));
154	r
155	}
156
157	/// The signed-in account.
158	#[derive(Clone)]
159	struct Me {
160	id: i64,
161	/// The account's principal, which owns its collections.
162	pid: i64,
163	admin: bool,
164	name: String,
165	/// The own principal href. Spelled as the request spelled the name when
166	/// it named this account: a client that asked for `/ALICE/` must get
167	/// hrefs it recognises.
168	principal: String,
169	}
170
171	/// The principal whose URLs a request addresses: the signed-in account, or
172	/// a room or resource. Another account's principal is readable too.
173	#[derive(Clone)]
174	struct Space {
175	id: i64,
176	/// The URL segment, as the request spelled it.
177	path: String,
178	display: String,
179	kind: UserType,
180	mine: bool,
181	}
182
183	impl Space {
184	fn principal(&self) -> String {
185	principal_href(&self.path)
186	}
187
188	fn home(&self, kind: PimKind) -> String {
189	format!("{PIM}/{}/{}/", kind_segment(kind), seg(&self.path))
190	}
191
192	fn collection(&self, kind: PimKind, slug: &str) -> String {
193	format!("{}{}/", self.home(kind), seg(slug))
194	}
195
196	fn object(&self, kind: PimKind, slug: &str, name: &str) -> String {
197	format!("{}{}", self.collection(kind, slug), seg(name))
198	}
199
200	/// A principal as PROPFIND and the searches describe it.
201	fn of(p: &PimPrincipal, me: &Me) -> Self {
202	Space {
203	id: p.id,
204	path: p.name.clone(),
205	display: p.display().to_string(),
206	kind: p.kind,
207	mine: p.id == me.pid,
208	}
209	}
210
211	/// Only the mailto address: Apple takes the first href in order unless
212	/// one is `preferred`, and an attendee matched by its principal URL gets
213	/// no reply buttons. Scheduling still accepts the principal URL and the
214	/// `urn:uuid:` form.
215	fn addresses(&self) -> Vec<String> {
216	vec![format!("mailto:{}", mailto(&self.path, self.kind))]
217	}
218	}
219
220	/// The URL of a principal.
221	pub(crate) fn principal_href(name: &str) -> String {
222	format!("{PIM}/principals/{}/", seg(name))
223	}
224
225	/// The principal name of a principal URL, given as a path or a full URL.
226	pub(super) fn principal_name(href: &str) -> Option<String> {
227	match parse_target(href_path(href)?.strip_prefix(PIM)?)? {
228	Target::Principal(name) => Some(name),
229	_ => None,
230	}
231	}
232
233	/// The URL of a collection in the home of `user`, whether it owns it or
234	/// has it lent (`lent_id`).
235	pub(crate) fn collection_href(
236	user: &str,
237	kind: PimKind,
238	slug: &str,
239	lent_id: Option<i64>,
240	) -> String {
241	let slug = match lent_id {
242	Some(id) => format!("{SHARED_PREFIX}{id}"),
243	None => slug.to_string(),
244	};
245	format!("{PIM}/{}/{}/{}/", kind_segment(kind), seg(user), seg(&slug))
246	}
247
248	/// What the signed-in account may do with a collection.
249	#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
250	enum Access {
251	Read,
252	/// Change members, not the collection's own properties.
253	Write,
254	/// Also send scheduling messages as the owner.
255	Schedule,
256	Own,
257	}
258
259	/// A collection as the signed-in account sees it.
260	struct Col {
261	/// `slug` and `displayname` as this account sees them.
262	c: PimCollection,
263	access: Access,
264	/// The principal href of the owner.
265	owner: String,
266	}
267
268	async fn serve(state: &AppState, user_id: i64, req: Request<Body>) -> Reply {
269	let Some(user) = state.db.find_user_by_id(user_id).await? else {
270	return Ok(super::dav::challenge());
271	};
272	let path = req.uri().path().strip_prefix(PIM).unwrap_or_default();
273	let Some(target) = parse_target(path) else {
274	return Ok(status(StatusCode::NOT_FOUND));
275	};
276	let (me, space) = match resolve_space(state, &user, &target).await? {
277	Ok(v) => v,
278	Err(code) => return Ok(status(code)),
279	};
280	state.db.pim_ensure_defaults(me.pid).await?;
281
282	let method = req.method().clone();
283	let (parts, body) = req.into_parts();
284	let cx = Cx {
285	state,
286	me: &me,
287	space: space.as_ref(),
288	};
289	let reply = match method.as_str() {
290	"OPTIONS" => Ok(options(&target)),
291	"POST" => cx.post(&target, body).await,
292	"PROPFIND" => cx.propfind(&target, &parts.headers, body).await,
293	"PROPPATCH" => cx.proppatch(&target, body).await,
294	"MKCALENDAR" \| "MKCOL" => cx.mkcol(&target, method.as_str(), body).await,
295	"GET" \| "HEAD" => {
296	cx.get(&target, &parts.headers, method == Method::HEAD)
297	.await
298	}
299	"PUT" => cx.put(&target, &parts.headers, body).await,
300	"DELETE" => cx.delete(&target, &parts.headers).await,
301	"REPORT" => cx.report(&target, body).await,
302	"MOVE" => cx.move_object(&target, &parts.headers).await,
303	_ => Ok(status(StatusCode::METHOD_NOT_ALLOWED)),
304	};
305	reply.map(\|mut r\| {
306	if r.status() == StatusCode::METHOD_NOT_ALLOWED {
307	r.headers_mut()
308	.insert(ALLOW, HeaderValue::from_static(allowed(&target)));
309	}
310	r
311	})
312	}
313
314	/// The methods a 405 names in `Allow`. OPTIONS keeps its wider list, which
315	/// clients read for what a URL may become.
316	fn allowed(target: &Target) -> &'static str {
317	match target {
318	Target::Collection(PimKind::Calendar, _, s) if s == OUTBOX => "OPTIONS, PROPFIND, POST",
319	Target::Collection(..) => "OPTIONS, GET, HEAD, DELETE, PROPFIND, PROPPATCH, REPORT",
320	Target::Object(..) => "OPTIONS, GET, HEAD, PUT, DELETE, MOVE, PROPFIND, REPORT",
321	Target::Home(..) \| Target::Principal(_) => {
322	"OPTIONS, GET, HEAD, PROPFIND, PROPPATCH, REPORT"
323	}
324	Target::Root \| Target::Principals => "OPTIONS, GET, HEAD, PROPFIND, REPORT",
325	}
326	}
327
328	/// Who asks, and in whose URL space. Another account's space is off limits
329	/// except for its principal.
330	async fn resolve_space(
331	state: &AppState,
332	user: &User,
333	target: &Target,
334	) -> Result<Result<(Me, Option<Space>), StatusCode>, ApiError> {
335	let mut me = Me {
336	id: user.id,
337	pid: state.db.principal_of(user.id).await?,
338	admin: user.is_admin,
339	name: user.name.clone(),
340	principal: principal_href(&user.name),
341	};
342	let Some(segment) = target.owner() else {
343	return Ok(Ok((me, None)));
344	};
345	if segment.eq_ignore_ascii_case(&user.name) {
346	me.principal = principal_href(segment);
347	let space = Space {
348	id: me.pid,
349	path: segment.to_string(),
350	display: user.name.clone(),
351	kind: UserType::Individual,
352	mine: true,
353	};
354	return Ok(Ok((me, Some(space))));
355	}
356	let Some(p) = state.db.pim_principal(segment).await? else {
357	return Ok(Err(StatusCode::NOT_FOUND));
358	};
359	if p.kind == UserType::Individual && !matches!(target, Target::Principal(_)) {
360	return Ok(Err(StatusCode::FORBIDDEN));
361	}
362	let space = Space {
363	id: p.id,
364	path: segment.to_string(),
365	display: p.display().to_string(),
366	kind: p.kind,
367	mine: false,
368	};
369	Ok(Ok((me, Some(space))))
370	}
371
372	#[derive(Debug)]
373	enum Target {
374	Root,
375	Principals,
376	Principal(String),
377	Home(PimKind, String),
378	Collection(PimKind, String, String),
379	Object(PimKind, String, String, String),
380	}
381
382	impl Target {
383	fn owner(&self) -> Option<&str> {
384	match self {
385	Target::Root \| Target::Principals => None,
386	Target::Principal(u)
387	\| Target::Home(_, u)
388	\| Target::Collection(_, u, _)
389	\| Target::Object(_, u, _, _) => Some(u),
390	}
391	}
392	}
393
394	fn parse_target(path: &str) -> Option<Target> {
395	let segs = path
396	.split('/')
397	.filter(\|s\| !s.is_empty())
398	.map(\|s\| {
399	let s = percent_decode_str(s).decode_utf8().ok()?;
400	(s != "." && s != "..").then(\|\| s.into_owned())
401	})
402	.collect::<Option<Vec<_>>>()?;
403	let kind = \|s: &str\| match s {
404	"calendars" => Some(PimKind::Calendar),
405	"addressbooks" => Some(PimKind::Addressbook),
406	_ => None,
407	};
408	let mut it = segs.into_iter();
409	let Some(first) = it.next() else {
410	return Some(Target::Root);
411	};
412	let rest: Vec<String> = it.collect();
413	if first == "principals" {
414	let mut rest = rest.into_iter();
415	return match (rest.next(), rest.next()) {
416	(None, _) => Some(Target::Principals),
417	(Some(user), None) => Some(Target::Principal(user)),
418	_ => None,
419	};
420	}
421	let kind = kind(&first)?;
422	let mut rest = rest.into_iter();
423	Some(match (rest.next(), rest.next(), rest.next(), rest.next()) {
424	(Some(u), None, None, None) => Target::Home(kind, u),
425	(Some(u), Some(c), None, None) => Target::Collection(kind, u, c),
426	(Some(u), Some(c), Some(o), None) => Target::Object(kind, u, c, o),
427	_ => return None,
428	})
429	}
430
431	fn kind_segment(kind: PimKind) -> &'static str {
432	match kind {
433	PimKind::Calendar => "calendars",
434	PimKind::Addressbook => "addressbooks",
435	}
436	}
437
438	fn kind_ns(kind: PimKind) -> &'static str {
439	match kind {
440	PimKind::Calendar => CALDAV,
441	PimKind::Addressbook => CARDDAV,
442	}
443	}
444
445	pub(super) fn seg(s: &str) -> String {
446	utf8_percent_encode(s, SEGMENT).to_string()
447	}
448
449	fn status(code: StatusCode) -> Response<Body> {
450	code.into_response()
451	}
452
453	/// 403: another object of the collection, at `href`, has the UID.
454	fn uid_conflict(ns: &str, href: &str) -> Response<Body> {
455	error(
456	StatusCode::FORBIDDEN,
457	with_children(el(ns, "no-uid-conflict"), hrefs([href])),
458	)
459	}
460
461	fn xml_response(code: StatusCode, body: String) -> Response<Body> {
462	(
463	code,
464	[(CONTENT_TYPE, "application/xml; charset=utf-8")],
465	body,
466	)
467	.into_response()
468	}
469
470	/// A failed precondition, named in a `<d:error>` body.
471	fn error(code: StatusCode, condition: Element) -> Response<Body> {
472	xml_response(code, xml::error(condition))
473	}
474
475	/// The condition for a lacking privilege on `href` (RFC 3744, 7.1.1).
476	pub(super) fn need_privilege(href: &str, ns: &str, privilege: &str) -> Element {
477	with_children(
478	el(DAV, "need-privileges"),
479	[with_children(
480	el(DAV, "resource"),
481	[
482	with_text(el(DAV, "href"), href),
483	with_children(el(DAV, "privilege"), [el(ns, privilege)]),
484	],
485	)],
486	)
487	}
488
489	fn denied(href: &str, privilege: &str) -> Response<Body> {
490	error(StatusCode::FORBIDDEN, need_privilege(href, DAV, privilege))
491	}
492
493	fn options(target: &Target) -> Response<Body> {
494	let outbox = matches!(target, Target::Collection(PimKind::Calendar, _, s) if s == OUTBOX);
495	let allow = match outbox {
496	true => "OPTIONS, PROPFIND, POST",
497	false => {
498	"OPTIONS, GET, HEAD, PUT, DELETE, MOVE, PROPFIND, PROPPATCH, MKCALENDAR, MKCOL, REPORT"
499	}
500	};
501	(StatusCode::OK, [(ALLOW.as_str(), allow)]).into_response()
502	}
503
504	async fn read_body(body: Body, limit: usize) -> Option<axum::body::Bytes> {
505	axum::body::to_bytes(body, limit).await.ok()
506	}
507
508	pub(super) fn etag_of(data: &[u8]) -> String {
509	format!("\"{}\"", crate::hex(&Sha256::digest(data)[..16]))
510	}
511
512	/// A stable UUID per principal, for the `urn:uuid:` calendar user address.
513	pub(super) fn principal_uuid(id: i64) -> String {
514	let h = crate::hex(&Sha256::digest(format!("dovenest principal {id}"))[..16]);
515	format!(
516	"{}-{}-{}-{}-{}",
517	&h[..8],
518	&h[8..12],
519	&h[12..16],
520	&h[16..20],
521	&h[20..]
522	)
523	}
524
525	/// The scheduling address of a principal. Rooms and resources use their own
526	/// subdomains, so no account name can take their address.
527	pub(super) fn mailto(name: &str, kind: UserType) -> String {
528	let domain = match kind {
529	UserType::Individual => MAIL_DOMAIN.to_string(),
530	UserType::Room => format!("rooms.{MAIL_DOMAIN}"),
531	UserType::Resource => format!("resources.{MAIL_DOMAIN}"),
532	};
533	format!("{}@{domain}", local_part(name))
534	}
535
536	/// A principal name as the local part of an address. Decoding the percent
537	/// escapes gives the name back.
538	pub(super) fn local_part(name: &str) -> String {
539	let set = match name.starts_with('.') \|\| name.ends_with('.') \|\| name.contains("..") {
540	true => LOCAL_NO_DOT,
541	false => LOCAL,
542	};
543	utf8_percent_encode(name, set).to_string()
544	}
545
546	// ---------------------------------------------------------------------------
547	// Collections and members
548	// ---------------------------------------------------------------------------
549
550	/// Whether a collection is generated rather than stored.
551	pub(super) fn generated(id: i64) -> bool {
552	id <= DIRECTORY
553	}
554
555	/// A generated collection. Its CTag and sync token come from `source`, what
556	/// its members are built from, so they are known without building them.
557	/// Only the current token is valid, so a client resyncs after each change.
558	fn generated_collection(
559	id: i64,
560	slug: &str,
561	name: &str,
562	components: &str,
563	source: &str,
564	) -> PimCollection {
565	// Bump when the members built from the same source change.
566	const FORMAT: &str = "1";
567	let digest = Sha256::digest(format!("{FORMAT}\n{source}"));
568	PimCollection {
569	id,
570	slug: slug.to_string(),
571	displayname: Some(name.to_string()),
572	components: components.to_string(),
573	seq: i64::from_be_bytes(digest[..8].try_into().expect("8 bytes")) & i64::MAX,
574	..Default::default()
575	}
576	}
577
578	pub(super) type Members = Vec<(PimObject, Vec<u8>)>;
579	type MemberMap = std::collections::HashMap<String, (PimObject, Vec<u8>)>;
580
581	/// The generated system address book.
582	pub(super) async fn directory_collection(state: &AppState) -> Result<PimCollection, ApiError> {
583	let source: String = state
584	.db
585	.pim_principals(true)
586	.await?
587	.iter()
588	.map(\|p\| format!("{}\t{}\t{}\t{:?}\n", p.id, p.name, p.display(), p.kind))
589	.collect();
590	Ok(generated_collection(
591	DIRECTORY,
592	DIRECTORY_SLUG,
593	"Directory",
594	"",
595	&source,
596	))
597	}
598
599	/// The members of the system address book: one card per visible principal.
600	pub(super) async fn directory(state: &AppState) -> Result<Members, ApiError> {
601	let mut members = Vec::new();
602	for p in state.db.pim_principals(true).await? {
603	let uuid = principal_uuid(p.id);
604	let uid = format!("urn:uuid:{uuid}");
605	let addresses: [String; 0] = [];
606	let view = Principal {
607	name: &p.name,
608	display: p.display(),
609	addresses: &addresses,
610	kind: p.kind,
611	};
612	let data = principal::card(&uid, &view, &mailto(&p.name, p.kind)).into_bytes();
613	members.push((
614	generated_object(format!("{uuid}.vcf"), uid, "VCARD", &data),
615	data,
616	));
617	}
618	Ok(members)
619	}
620
621	/// The generated birthday calendar of a principal. It changes whenever one
622	/// of the principal's own address books does.
623	pub(super) async fn birthdays_collection(
624	state: &AppState,
625	principal: i64,
626	) -> Result<PimCollection, ApiError> {
627	let source: String = state
628	.db
629	.pim_collections(principal, PimKind::Addressbook)
630	.await?
631	.iter()
632	.map(\|b\| format!("{}:{}\n", b.id, b.seq))
633	.collect();
634	let mut col = generated_collection(BIRTHDAYS, BIRTHDAYS_SLUG, "Birthdays", "VEVENT", &source);
635	col.transparent = true;
636	Ok(col)
637	}
638
639	/// The members of the birthday calendar: the birthdays and anniversaries in
640	/// the principal's own address books, not lent ones.
641	// ponytail: rebuilt from every contact on each request. Store the events if
642	// large address books make it slow.
643	pub(super) async fn birthdays(state: &AppState, principal: i64) -> Result<Members, ApiError> {
644	let mut books = Vec::new();
645	for book in state
646	.db
647	.pim_collections(principal, PimKind::Addressbook)
648	.await?
649	{
650	books.push((book.id, state.db.pim_objects_with_data(book.id).await?));
651	}
652	blocking(move \|\| -> Result<Members, ApiError> {
653	let mut members = Vec::new();
654	for (book, objects) in books {
655	for (o, data) in objects {
656	let key = format!("{book}/{}", o.name);
657	for (uid, ics) in contact::dates(&String::from_utf8_lossy(&data), &key) {
658	let data = ics.into_bytes();
659	members.push((
660	generated_object(format!("{uid}.ics"), uid, "VEVENT", &data),
661	data,
662	));
663	}
664	}
665	}
666	Ok(members)
667	})
668	.await
669	}
670
671	/// The members of collection `id`, stored or generated. `principal` owns
672	/// a generated birthday calendar.
673	pub(super) async fn members_of(
674	state: &AppState,
675	principal: i64,
676	id: i64,
677	) -> Result<Members, ApiError> {
678	match id {
679	DIRECTORY => directory(state).await,
680	BIRTHDAYS => birthdays(state, principal).await,
681	id => Ok(state.db.pim_objects_with_data(id).await?),
682	}
683	}
684
685	fn generated_object(name: String, uid: String, component: &str, data: &[u8]) -> PimObject {
686	PimObject {
687	name,
688	uid,
689	component: component.to_string(),
690	etag: etag_of(data),
691	size: data.len() as i64,
692	..Default::default()
693	}
694	}
695
696	/// The request context: who asks, and in whose URL space.
697	struct Cx<'a> {
698	state: &'a AppState,
699	me: &'a Me,
700	space: Option<&'a Space>,
701	}
702
703	impl Cx<'_> {
704	fn space(&self) -> &Space {
705	self.space.expect("targets with an owner resolve a space")
706	}
707
708	/// A collection of the space by slug, with the access of the signed-in
709	/// account.
710	async fn collection(&self, kind: PimKind, slug: &str) -> Result<Option<Col>, ApiError> {
711	let space = self.space();
712	let db = &self.state.db;
713	if !space.mine {
714	if slug == INBOX {
715	return Ok(None);
716	}
717	// A room: everyone reads its bookings, admins may change and
718	// answer them.
719	let access = if self.me.admin {
720	Access::Schedule
721	} else {
722	Access::Read
723	};
724	return Ok(db.pim_collection(space.id, kind, slug).await?.map(\|c\| Col {
725	c,
726	access,
727	owner: space.principal(),
728	}));
729	}
730	if let Some(c) = db.pim_collection(space.id, kind, slug).await? {
731	return Ok(Some(Col {
732	c,
733	access: Access::Own,
734	owner: space.principal(),
735	}));
736	}
737	let generated = match (kind, slug) {
738	(PimKind::Addressbook, DIRECTORY_SLUG) => Some(directory_collection(self.state).await?),
739	(PimKind::Calendar, BIRTHDAYS_SLUG) => {
740	Some(birthdays_collection(self.state, space.id).await?)
741	}
742	_ => None,
743	};
744	if let Some(c) = generated {
745	return Ok(Some(Col {
746	c,
747	access: Access::Read,
748	owner: space.principal(),
749	}));
750	}
751	let Some(id) = slug
752	.strip_prefix(SHARED_PREFIX)
753	.and_then(\|id\| id.parse::<i64>().ok())
754	else {
755	return Ok(None);
756	};
757	Ok(db
758	.pim_shared_collection(self.me.id, kind, id)
759	.await?
760	.map(\|(c, owner, mode)\| lent(c, &owner, mode)))
761	}
762
763	/// Every collection of `kind` in the space's home.
764	async fn collections(&self, kind: PimKind) -> Result<Vec<Col>, ApiError> {
765	let space = self.space();
766	let db = &self.state.db;
767	let own = if space.mine {
768	Access::Own
769	} else if self.me.admin {
770	Access::Schedule
771	} else {
772	Access::Read
773	};
774	let mut out: Vec<Col> = db
775	.pim_collections(space.id, kind)
776	.await?
777	.into_iter()
778	.filter(\|c\| space.mine \|\| c.slug != INBOX)
779	.map(\|c\| Col {
780	c,
781	access: own,
782	owner: space.principal(),
783	})
784	.collect();
785	if space.mine {
786	let generated = match kind {
787	PimKind::Addressbook => directory_collection(self.state).await?,
788	PimKind::Calendar => birthdays_collection(self.state, space.id).await?,
789	};
790	out.push(Col {
791	c: generated,
792	access: Access::Read,
793	owner: space.principal(),
794	});
795	for (c, owner, mode) in db.pim_shared_collections(self.me.id, kind).await? {
796	out.push(lent(c, &owner, mode));
797	}
798	}
799	Ok(out)
800	}
801
802	async fn members(&self, c: &PimCollection) -> Result<Members, ApiError> {
803	members_of(self.state, self.space().id, c.id).await
804	}
805
806	async fn member_map(&self, c: &PimCollection) -> Result<MemberMap, ApiError> {
807	Ok(self
808	.members(c)
809	.await?
810	.into_iter()
811	.map(\|m\| (m.0.name.clone(), m))
812	.collect())
813	}
814
815	/// A generated collection is built as a whole, so a REPORT that looks up
816	/// many of its members builds it once.
817	async fn generated_members(&self, c: &PimCollection) -> Result<Option<MemberMap>, ApiError> {
818	match generated(c.id) {
819	true => Ok(Some(self.member_map(c).await?)),
820	false => Ok(None),
821	}
822	}
823
824	async fn member(
825	&self,
826	c: &PimCollection,
827	name: &str,
828	) -> Result<Option<(PimObject, Vec<u8>)>, ApiError> {
829	member_of(self.state, self.space().id, c.id, name).await
830	}
831	}
832
833	/// The member `name` of collection `id` of `principal`, generated or stored.
834	pub(super) async fn member_of(
835	state: &AppState,
836	principal: i64,
837	id: i64,
838	name: &str,
839	) -> Result<Option<(PimObject, Vec<u8>)>, ApiError> {
840	if generated(id) {
841	let all = members_of(state, principal, id).await?;
842	return Ok(all.into_iter().find(\|(o, _)\| o.name == name));
843	}
844	Ok(state.db.pim_object(id, name).await?)
845	}
846
847	/// Deletes a collection of principal `owner`. A calendar's scheduling
848	/// objects are cancelled for their attendees first. `Err` names the
849	/// precondition that refuses it: the calendar that receives invitations
850	/// stays. Takes [`pim_schedule::LOCK`].
851	pub(super) async fn delete_own(
852	state: &AppState,
853	owner: i64,
854	kind: PimKind,
855	col: &PimCollection,
856	) -> Result<Result<(), Element>, ApiError> {
857	let db = &state.db;
858	// A PUT checks under the lock that its collection still exists.
859	let _lock = pim_schedule::LOCK.lock().await;
860	if db.pim_collection_by_id(col.id).await?.is_none() {
861	return Err(ApiError::new(StatusCode::NOT_FOUND, "collection not found"));
862	}
863	if kind == PimKind::Calendar && col.slug != INBOX {
864	if db
865	.pim_calendar_for(owner, "VEVENT")
866	.await?
867	.is_some_and(\|d\| d.id == col.id)
868	{
869	return Ok(Err(el(CALDAV, "default-calendar-needed")));
870	}
871	let dir = Directory::load(state).await?;
872	let owner = dir
873	.get(owner)
874	.cloned()
875	.ok_or_else(\|\| ApiError::new(StatusCode::NOT_FOUND, "collection not found"))?;
876	let mut ops = match pim_schedule::retract(state, &dir, &owner, &[col.id]).await? {
877	Ok(ops) => ops,
878	Err(refused) => return Ok(Err(refused)),
879	};
880	// The cancellations commit with the delete, so no event goes without
881	// its attendees hearing of it.
882	ops.push(PimOp::DeleteCollection(col.id));
883	db.pim_apply(&ops).await?;
884	return Ok(Ok(()));
885	}
886	db.pim_apply(&[PimOp::DeleteCollection(col.id)]).await?;
887	Ok(Ok(()))
888	}
889
890	/// A collection lent to the signed-in account, as it appears in their home.
891	fn lent(mut c: PimCollection, owner: &str, mode: PimShareMode) -> Col {
892	let name = c.displayname.take().unwrap_or_else(\|\| c.slug.clone());
893	c.displayname = Some(format!("{name} ({owner})"));
894	c.slug = format!("{SHARED_PREFIX}{}", c.id);
895	Col {
896	c,
897	access: match mode {
898	PimShareMode::Ro => Access::Read,
899	PimShareMode::Rw => Access::Write,
900	PimShareMode::RwSchedule => Access::Schedule,
901	},
902	owner: principal_href(owner),
903	}
904	}
905
906	// ---------------------------------------------------------------------------
907	// PROPFIND
908	// ---------------------------------------------------------------------------
909
910	/// A resource PROPFIND can describe.
911	enum Res {
912	Root,
913	Principals,
914	Principal(Space),
915	/// With its owner's principal href, whether the account may add to it,
916	/// and where its client properties live.
917	Home(String, Access, PropPlace),
918	Collection(PimKind, Col),
919	/// With the href of the calendar that receives new invitations.
920	Inbox(Col, Option<String>),
921	/// With its owner's principal href.
922	Outbox(String),
923	Object(PimKind, PimObject),
924	}
925
926	impl Cx<'_> {
927	async fn propfind(&self, target: &Target, headers: &HeaderMap, body: Body) -> Reply {
928	// Missing means infinity to RFC 4918, but clients that omit it mean 0.
929	let deep = match headers.get("depth").and_then(\|v\| v.to_str().ok()) {
930	None \| Some("0") => false,
931	Some("1") => true,
932	Some(_) => {
933	return Ok(error(
934	StatusCode::FORBIDDEN,
935	el(DAV, "propfind-finite-depth"),
936	));
937	}
938	};
939	let Some(body) = read_body(body, MAX_XML_SIZE).await else {
940	return Ok(status(StatusCode::PAYLOAD_TOO_LARGE));
941	};
942	let Ok(request) = xml::propfind(&body) else {
943	return Ok(status(StatusCode::BAD_REQUEST));
944	};
945
946	let mut list: Vec<(String, Res)> = Vec::new();
947	match target {
948	Target::Root => list.push((format!("{PIM}/"), Res::Root)),
949	Target::Principals => {
950	list.push((format!("{PIM}/principals/"), Res::Principals));
951	if deep {
952	for p in self.state.db.pim_principals(true).await? {
953	list.push((
954	principal_href(&p.name),
955	Res::Principal(Space::of(&p, self.me)),
956	));
957	}
958	}
959	}
960	Target::Principal(_) => {
961	let s = self.space();
962	list.push((s.principal(), Res::Principal(s.clone())));
963	}
964	Target::Home(kind, _) => {
965	let s = self.space();
966	let access = if s.mine { Access::Own } else { Access::Read };
967	let place = PropPlace::Home(s.id, *kind);
968	list.push((s.home(*kind), Res::Home(s.principal(), access, place)));
969	if deep {
970	for col in self.collections(*kind).await? {
971	let href = s.collection(*kind, &col.c.slug);
972	list.push((href, self.res(*kind, col).await?));
973	}
974	if *kind == PimKind::Calendar && s.mine {
975	list.push((s.collection(*kind, OUTBOX), Res::Outbox(s.principal())));
976	}
977	}
978	}
979	Target::Collection(PimKind::Calendar, _, slug)
980	if slug == OUTBOX && self.space().mine =>
981	{
982	let s = self.space();
983	list.push((
984	s.collection(PimKind::Calendar, OUTBOX),
985	Res::Outbox(s.principal()),
986	));
987	}
988	Target::Collection(kind, _, slug) => {
989	let Some(col) = self.collection(*kind, slug).await? else {
990	return Ok(status(StatusCode::NOT_FOUND));
991	};
992	let objects = match (deep, col.c.id) {
993	(false, _) => Vec::new(),
994	(true, id) if generated(id) => self
995	.members(&col.c)
996	.await?
997	.into_iter()
998	.map(\|(o, _)\| o)
999	.collect(),
1000	(true, id) => self.state.db.pim_objects(id).await?,
1001	};
1002	let s = self.space();
1003	let slug = col.c.slug.clone();
1004	list.push((s.collection(kind, &slug), self.res(kind, col).await?));
1005	for o in objects {
1006	list.push((s.object(kind, &slug, &o.name), Res::Object(kind, o)));
1007	}
1008	}
1009	Target::Object(kind, _, slug, name) => {
1010	let found = match self.collection(*kind, slug).await? {
1011	Some(col) => self.member(&col.c, name).await?,
1012	None => None,
1013	};
1014	let Some((o, _)) = found else {
1015	return Ok(status(StatusCode::NOT_FOUND));
1016	};
1017	list.push((
1018	self.space().object(*kind, slug, name),
1019	Res::Object(*kind, o),
1020	));
1021	}
1022	}
1023
1024	let described_len = list.len();
1025	let mut described = Vec::with_capacity(described_len);
1026	for (href, res) in list {
1027	let dead = self.dead_props(&res).await?;
1028	described.push((href, res, dead));
1029	}
1030	let answer = move \|me: &Me, space: Option<&Space>\| {
1031	let responses: Vec<_> = described
1032	.into_iter()
1033	.map(\|(href, res, dead)\| {
1034	let mut all = live_props(me, space, &res);
1035	all.extend(dead);
1036	select(href, &request, all)
1037	})
1038	.collect();
1039	multistatus(&responses, None)
1040	};
1041	// A handoff to the blocking pool costs more than a small answer.
1042	if described_len <= INLINE_RESPONSES {
1043	return Ok(answer(self.me, self.space));
1044	}
1045	let (me, space) = (self.me.clone(), self.space.cloned());
1046	blocking(move \|\| -> Reply { Ok(answer(&me, space.as_ref())) }).await
1047	}
1048
1049	/// The client properties stored for a resource. Those of a principal or
1050	/// home only reach the accounts that may write them: they hold another
1051	/// account's client settings.
1052	async fn dead_props(&self, res: &Res) -> Result<Vec<Element>, ApiError> {
1053	let place = match res {
1054	Res::Principal(p) if p.mine \|\| (self.me.admin && p.kind != UserType::Individual) => {
1055	PropPlace::Principal(p.id)
1056	}
1057	Res::Home(_, _, place) if self.may_edit(self.space()) => *place,
1058	Res::Collection(_, col) \| Res::Inbox(col, _) if !generated(col.c.id) => {
1059	PropPlace::Collection(col.c.id)
1060	}
1061	_ => return Ok(Vec::new()),
1062	};
1063	Ok(self
1064	.state
1065	.db
1066	.pim_props(place)
1067	.await?
1068	.iter()
1069	.filter_map(\|p\| Element::parse(p.xml.as_bytes()).ok())
1070	.collect())
1071	}
1072	}
1073
1074	/// Every live property of a resource, with its value.
1075	fn live_props(me: &Me, space: Option<&Space>, res: &Res) -> Vec<Element> {
1076	let text = \|ns: &str, local: &str, v: &str\| with_text(el(ns, local), v);
1077	let href_prop = \|ns: &str, local: &str, h: &str\| with_children(el(ns, local), hrefs([h]));
1078	let resourcetype = \|types: &[(&str, &str)]\| {
1079	with_children(
1080	el(DAV, "resourcetype"),
1081	types.iter().map(\|(ns, l)\| el(ns, l)),
1082	)
1083	};
1084	let principals = format!("{PIM}/principals/");
1085	let mut out = vec![
1086	href_prop(DAV, "current-user-principal", &me.principal),
1087	href_prop(DAV, "principal-collection-set", &principals),
1088	];
1089	match res {
1090	Res::Root => out.push(resourcetype(&[(DAV, "collection")])),
1091	Res::Principals => out.extend([
1092	resourcetype(&[(DAV, "collection")]),
1093	privileges(Access::Read),
1094	principal_reports(),
1095	]),
1096	Res::Principal(p) => {
1097	// The own principal in the spelling of the request.
1098	let href = match p.mine {
1099	true => me.principal.clone(),
1100	false => principal_href(&p.path),
1101	};
1102	let addresses = p.addresses();
1103	out.extend([
1104	resourcetype(&[(DAV, "collection"), (DAV, "principal")]),
1105	text(DAV, "displayname", &p.display),
1106	href_prop(DAV, "principal-URL", &href),
1107	with_children(
1108	el(CALDAV, "calendar-user-address-set"),
1109	hrefs(addresses.iter().map(String::as_str))
1110	.into_iter()
1111	.map(\|h\| with_attr(h, "preferred", "1")),
1112	),
1113	with_children(
1114	el(CALSERVER, "email-address-set"),
1115	[with_text(
1116	el(CALSERVER, "email-address"),
1117	mailto(&p.path, p.kind),
1118	)],
1119	),
1120	text(CALDAV, "calendar-user-type", p.kind.as_str()),
1121	privileges(if p.mine { Access::Own } else { Access::Read }),
1122	principal_reports(),
1123	]);
1124	let home = \|kind: PimKind\| {
1125	let name = match p.mine {
1126	true => space
1127	.filter(\|s\| s.mine)
1128	.map_or(p.path.clone(), \|s\| s.path.clone()),
1129	false => p.path.clone(),
1130	};
1131	format!("{PIM}/{}/{}/", kind_segment(kind), seg(&name))
1132	};
1133	// Also for other accounts: python-caldav drops a search hit
1134	// without one. Their homes still answer 403.
1135	out.push(href_prop(
1136	CALDAV,
1137	"calendar-home-set",
1138	&home(PimKind::Calendar),
1139	));
1140	if p.mine {
1141	let cal = home(PimKind::Calendar);
1142	out.push(href_prop(
1143	CALDAV,
1144	"schedule-inbox-URL",
1145	&format!("{cal}{INBOX}/"),
1146	));
1147	out.push(href_prop(
1148	CALDAV,
1149	"schedule-outbox-URL",
1150	&format!("{cal}{OUTBOX}/"),
1151	));
1152	let book = home(PimKind::Addressbook);
1153	out.push(href_prop(CARDDAV, "addressbook-home-set", &book));
1154	out.push(href_prop(
1155	CARDDAV,
1156	"directory-gateway",
1157	&format!("{book}{DIRECTORY_SLUG}/"),
1158	));
1159	}
1160	}
1161	Res::Home(owner, access, _) => out.extend([
1162	resourcetype(&[(DAV, "collection")]),
1163	href_prop(DAV, "owner", owner),
1164	privileges(*access),
1165	]),
1166	Res::Collection(kind, col) => {
1167	let c = &col.c;
1168	let (types, desc) = match kind {
1169	PimKind::Calendar => ((CALDAV, "calendar"), (CALDAV, "calendar-description")),
1170	PimKind::Addressbook => (
1171	(CARDDAV, "addressbook"),
1172	(CARDDAV, "addressbook-description"),
1173	),
1174	};
1175	out.extend([
1176	resourcetype(&[(DAV, "collection"), types]),
1177	href_prop(DAV, "owner", &col.owner),
1178	privileges(col.access),
1179	supported_reports(*kind),
1180	text(CALSERVER, "getctag", &format!("{}-{}", c.id, c.seq)),
1181	text(DAV, "sync-token", &sync_token(c.id, c.seq, None)),
1182	text(
1183	kind_ns(*kind),
1184	"max-resource-size",
1185	&MAX_RESOURCE_SIZE.to_string(),
1186	),
1187	]);
1188	if let Some(v) = &c.displayname {
1189	out.push(text(DAV, "displayname", v));
1190	}
1191	if let Some(v) = &c.description {
1192	out.push(text(desc.0, desc.1, v));
1193	}
1194	match kind {
1195	PimKind::Calendar => {
1196	out.push(with_children(
1197	el(CALDAV, "supported-calendar-component-set"),
1198	c.components
1199	.split(',')
1200	.map(\|comp\| with_attr(el(CALDAV, "comp"), "name", comp)),
1201	));
1202	out.push(with_children(
1203	el(CALDAV, "supported-calendar-data"),
1204	[with_attr(
1205	with_attr(el(CALDAV, "calendar-data"), "content-type", "text/calendar"),
1206	"version",
1207	"2.0",
1208	)],
1209	));
1210	if let Some(v) = &c.color {
1211	out.push(text(APPLE, "calendar-color", v));
1212	}
1213	if let Some(v) = &c.sort_order {
1214	out.push(text(APPLE, "calendar-order", v));
1215	}
1216	if let Some(v) = &c.timezone {
1217	out.push(text(CALDAV, "calendar-timezone", v));
1218	}
1219	out.push(with_children(
1220	el(CALDAV, "schedule-calendar-transp"),
1221	[el(
1222	CALDAV,
1223	if c.transparent {
1224	"transparent"
1225	} else {
1226	"opaque"
1227	},
1228	)],
1229	));
1230	}
1231	// 3.0 only: a client told of 4.0 writes 4.0 groups, which
1232	// Apple Contacts on the same account cannot read. A 4.0
1233	// PUT is still stored, and served as 4.0 on request.
1234	PimKind::Addressbook => out.push(with_children(
1235	el(CARDDAV, "supported-address-data"),
1236	[with_attr(
1237	with_attr(
1238	el(CARDDAV, "address-data-type"),
1239	"content-type",
1240	"text/vcard",
1241	),
1242	"version",
1243	"3.0",
1244	)],
1245	)),
1246	}
1247	}
1248	Res::Inbox(col, default) => {
1249	let c = &col.c;
1250	out.extend([
1251	resourcetype(&[(DAV, "collection"), (CALDAV, "schedule-inbox")]),
1252	href_prop(DAV, "owner", &col.owner),
1253	privilege_set(INBOX_PRIVILEGES),
1254	report_set(&[
1255	(CALDAV, "calendar-multiget"),
1256	(CALDAV, "calendar-query"),
1257	(DAV, "sync-collection"),
1258	]),
1259	text(CALSERVER, "getctag", &format!("{}-{}", c.id, c.seq)),
1260	text(DAV, "sync-token", &sync_token(c.id, c.seq, None)),
1261	]);
1262	if let Some(v) = &c.displayname {
1263	out.push(text(DAV, "displayname", v));
1264	}
1265	if let Some(h) = default {
1266	out.push(href_prop(CALDAV, "schedule-default-calendar-URL", h));
1267	}
1268	}
1269	Res::Outbox(owner) => out.extend([
1270	resourcetype(&[(DAV, "collection"), (CALDAV, "schedule-outbox")]),
1271	href_prop(DAV, "owner", owner),
1272	privilege_set(OUTBOX_PRIVILEGES),
1273	]),
1274	Res::Object(kind, o) => {
1275	if let Some(tag) = &o.schedule_tag {
1276	out.push(text(CALDAV, "schedule-tag", tag));
1277	}
1278	out.extend([
1279	resourcetype(&[]),
1280	text(DAV, "getetag", &o.etag),
1281	text(DAV, "getcontenttype", &content_type(*kind, &o.component)),
1282	text(DAV, "getcontentlength", &o.size.to_string()),
1283	]);
1284	if let Ok(t) = chrono::DateTime::parse_from_rfc3339(&o.modified_at) {
1285	let http_date = t.to_utc().format("%a, %d %b %Y %H:%M:%S GMT").to_string();
1286	out.push(text(DAV, "getlastmodified", &http_date));
1287	}
1288	}
1289	}
1290	out
1291	}
1292
1293	impl Cx<'_> {
1294	/// How PROPFIND describes a collection. The inbox names the calendar
1295	/// that receives new invitations.
1296	async fn res(&self, kind: PimKind, col: Col) -> Result<Res, ApiError> {
1297	if kind != PimKind::Calendar \|\| col.c.slug != INBOX {
1298	return Ok(Res::Collection(kind, col));
1299	}
1300	let space = self.space();
1301	let default = self
1302	.state
1303	.db
1304	.pim_calendar_for(space.id, "VEVENT")
1305	.await?
1306	.map(\|c\| space.collection(PimKind::Calendar, &c.slug));
1307	Ok(Res::Inbox(col, default))
1308	}
1309	}
1310
1311	/// The response for one resource: the requested ones of `all`, and 404 for
1312	/// those it lacks.
1313	fn select(href: String, request: &Propfind, all: Vec<Element>) -> xml::Response {
1314	let mut r = xml::Response::new(href);
1315	match request {
1316	Propfind::AllProp(_) => all.into_iter().for_each(\|p\| r.push(200, p)),
1317	Propfind::PropName => all.iter().for_each(\|p\| r.push(200, Name::of(p).element())),
1318	Propfind::Prop(names) => {
1319	for n in names {
1320	match all.iter().find(\|p\| Name::of(p) == *n) {
1321	Some(p) => r.push(200, p.clone()),
1322	None => r.push(404, n.element()),
1323	}
1324	}
1325	}
1326	}
1327	if r.propstats.is_empty() {
1328	r.status = Some(200);
1329	}
1330	r
1331	}
1332
1333	fn multistatus(responses: &[xml::Response], tail: Option<Element>) -> Response<Body> {
1334	xml_response(
1335	StatusCode::MULTI_STATUS,
1336	xml::multistatus_with(&Name::new(DAV, "multistatus"), responses, tail),
1337	)
1338	}
1339
1340	fn report_set(reports: &[(&str, &str)]) -> Element {
1341	with_children(
1342	el(DAV, "supported-report-set"),
1343	reports.iter().map(\|(ns, local)\| {
1344	with_children(
1345	el(DAV, "supported-report"),
1346	[with_children(el(DAV, "report"), [el(ns, local)])],
1347	)
1348	}),
1349	)
1350	}
1351
1352	fn supported_reports(kind: PimKind) -> Element {
1353	report_set(match kind {
1354	PimKind::Calendar => &[
1355	(CALDAV, "calendar-multiget"),
1356	(CALDAV, "calendar-query"),
1357	(CALDAV, "free-busy-query"),
1358	(DAV, "sync-collection"),
1359	],
1360	PimKind::Addressbook => &[
1361	(CARDDAV, "addressbook-multiget"),
1362	(CARDDAV, "addressbook-query"),
1363	(DAV, "sync-collection"),
1364	],
1365	})
1366	}
1367
1368	fn principal_reports() -> Element {
1369	report_set(&[
1370	(DAV, "principal-property-search"),
1371	(DAV, "principal-search-property-set"),
1372	(CALSERVER, "calendarserver-principal-search"),
1373	])
1374	}
1375
1376	fn privileges(access: Access) -> Element {
1377	const WRITE: [(&str, &str); 5] = [
1378	(DAV, "read"),
1379	(DAV, "write-content"),
1380	(DAV, "bind"),
1381	(DAV, "unbind"),
1382	(DAV, "read-current-user-privilege-set"),
1383	];
1384	let names: Vec<(&str, &str)> = match access {
1385	Access::Own => [
1386	"all",
1387	"read",
1388	"write",
1389	"write-properties",
1390	"write-content",
1391	"bind",
1392	"unbind",
1393	"read-current-user-privilege-set",
1394	]
1395	.map(\|n\| (DAV, n))
1396	.to_vec(),
1397	// RFC 6638 grants these on the outbox, which a sharee cannot see.
1398	Access::Schedule => [
1399	(CALDAV, "schedule-send"),
1400	(CALDAV, "schedule-send-invite"),
1401	(CALDAV, "schedule-send-reply"),
1402	]
1403	.into_iter()
1404	.chain(WRITE)
1405	.collect(),
1406	Access::Write => WRITE.to_vec(),
1407	Access::Read => vec![(DAV, "read"), (DAV, "read-current-user-privilege-set")],
1408	};
1409	privilege_set(names)
1410	}
1411
1412	/// The owner reads and empties the inbox; only the server delivers into it.
1413	const INBOX_PRIVILEGES: [(&str, &str); 7] = [
1414	(DAV, "read"),
1415	(DAV, "unbind"),
1416	(DAV, "read-current-user-privilege-set"),
1417	(CALDAV, "schedule-deliver"),
1418	(CALDAV, "schedule-deliver-invite"),
1419	(CALDAV, "schedule-deliver-reply"),
1420	(CALDAV, "schedule-query-freebusy"),
1421	];
1422
1423	const OUTBOX_PRIVILEGES: [(&str, &str); 6] = [
1424	(DAV, "read"),
1425	(DAV, "read-current-user-privilege-set"),
1426	(CALDAV, "schedule-send"),
1427	(CALDAV, "schedule-send-invite"),
1428	(CALDAV, "schedule-send-reply"),
1429	(CALDAV, "schedule-send-freebusy"),
1430	];
1431
1432	fn privilege_set<'a>(names: impl IntoIterator<Item = (&'a str, &'a str)>) -> Element {
1433	with_children(
1434	el(DAV, "current-user-privilege-set"),
1435	names
1436	.into_iter()
1437	.map(\|(ns, n)\| with_children(el(DAV, "privilege"), [el(ns, n)])),
1438	)
1439	}
1440
1441	/// Carries the collection id, so a token handed out for a deleted
1442	/// collection never matches the one that later takes its URL. A cut initial
1443	/// sync also carries `issued`, the collection seq it began at.
1444	fn sync_token(id: i64, seq: i64, issued: Option<i64>) -> String {
1445	match issued {
1446	Some(i) => format!("urn:dovenest:sync:{id}-{seq}.{i}"),
1447	None => format!("urn:dovenest:sync:{id}-{seq}"),
1448	}
1449	}
1450
1451	fn content_type(kind: PimKind, component: &str) -> String {
1452	match kind {
1453	PimKind::Calendar => format!("text/calendar; charset=utf-8; component={component}"),
1454	PimKind::Addressbook => "text/vcard; charset=utf-8".to_string(),
1455	}
1456	}
1457
1458	// ---------------------------------------------------------------------------
1459	// PROPPATCH, MKCALENDAR, MKCOL
1460	// ---------------------------------------------------------------------------
1461
1462	impl Cx<'_> {
1463	async fn proppatch(&self, target: &Target, body: Body) -> Reply {
1464	let Some(body) = read_body(body, MAX_XML_SIZE).await else {
1465	return Ok(status(StatusCode::PAYLOAD_TOO_LARGE));
1466	};
1467	let Ok(mut update) = xml::update(&body) else {
1468	return Ok(status(StatusCode::BAD_REQUEST));
1469	};
1470	// Read before the lock, so a slow client cannot hold it.
1471	let _lock = pim_schedule::LOCK.lock().await;
1472	let (href, place, res, mut col) = match target {
1473	Target::Collection(kind, _, slug) => {
1474	let Some(col) = self.collection(*kind, slug).await? else {
1475	return Ok(status(StatusCode::NOT_FOUND));
1476	};
1477	let href = self.space().collection(*kind, slug);
1478	// Per property, so a client that colors every calendar it sees
1479	// goes on.
1480	if col.access != Access::Own {
1481	let mut r = xml::Response::new(href.clone());
1482	r.error = Some(need_privilege(&href, DAV, "write-properties"));
1483	let names = update
1484	.set
1485	.iter()
1486	.map(Name::of)
1487	.chain(update.remove.iter().cloned());
1488	for n in names {
1489	r.push(403, n.element());
1490	}
1491	return Ok(multistatus(&[r], None));
1492	}
1493	let place = PropPlace::Collection(col.c.id);
1494	let stored = (*kind, col.c.clone());
1495	(href, place, self.res(*kind, col).await?, Some(stored))
1496	}
1497	Target::Home(kind, _) => {
1498	let s = self.space();
1499	if !self.may_edit(s) {
1500	return Ok(denied(&s.home(*kind), "write-properties"));
1501	}
1502	let place = PropPlace::Home(s.id, *kind);
1503	let res = Res::Home(s.principal(), Access::Own, place);
1504	(s.home(*kind), place, res, None)
1505	}
1506	Target::Principal(_) => {
1507	let s = self.space();
1508	if !self.may_edit(s) {
1509	return Ok(denied(&s.principal(), "write-properties"));
1510	}
1511	let place = PropPlace::Principal(s.id);
1512	(s.principal(), place, Res::Principal(s.clone()), None)
1513	}
1514	_ => return Ok(status(StatusCode::FORBIDDEN)),
1515	};
1516	let before = col.as_ref().map(\|(_, c)\| c.clone());
1517	// The inbox names the calendar that receives invitations (RFC 6638,
1518	// 9.2). `Some(Err(()))`: it names none of the owner's calendars.
1519	let default_url = Name::new(CALDAV, "schedule-default-calendar-URL");
1520	let mut default = None;
1521	if matches!(res, Res::Inbox(..)) {
1522	if let Some(i) = update.set.iter().position(\|p\| Name::of(p) == default_url) {
1523	let p = update.set.remove(i);
1524	let href = xml::child(&p, DAV, "href").map(xml::text);
1525	default = Some(match href {
1526	Some(h) => self.receiving_calendar(&h).await?.map(Some).ok_or(()),
1527	None => Err(()),
1528	});
1529	} else if let Some(i) = update.remove.iter().position(\|n\| *n == default_url) {
1530	update.remove.remove(i);
1531	default = Some(Ok(None));
1532	}
1533	}
1534	let live: Vec<Name> = live_props(self.me, self.space, &res)
1535	.iter()
1536	.map(Name::of)
1537	.collect();
1538	let stored = self.state.db.pim_props(place).await?;
1539	let mut patch = apply(
1540	col.as_mut().map(\|(k, c)\| (*k, c)),
1541	&update,
1542	false,
1543	&live,
1544	&stored,
1545	);
1546	let default_ok = !matches!(default, Some(Err(())));
1547	if !default_ok {
1548	for (code, _) in &mut patch.results {
1549	if *code == 200 {
1550	*code = 424;
1551	}
1552	}
1553	}
1554	let all_ok = patch.ok() && default_ok;
1555	if all_ok {
1556	let db = &self.state.db;
1557	db.pim_patch(
1558	place,
1559	before.as_ref().zip(col.as_ref().map(\|(_, c)\| c)),
1560	&patch.set,
1561	&patch.remove,
1562	)
1563	.await?;
1564	if let Some(Ok(id)) = default {
1565	db.pim_set_default_calendar(self.space().id, id).await?;
1566	}
1567	}
1568	let mut r = xml::Response::new(href);
1569	r.error = match (default_ok, patch.protected) {
1570	(false, _) => Some(el(CALDAV, "valid-schedule-default-calendar-URL")),
1571	(true, true) => Some(el(DAV, "cannot-modify-protected-property")),
1572	(true, false) => None,
1573	};
1574	for (code, prop) in patch.results {
1575	r.push(code, prop);
1576	}
1577	if let Some(d) = default {
1578	let code = match (d, all_ok) {
1579	(Err(()), _) => 403,
1580	(Ok(_), true) => 200,
1581	(Ok(_), false) => 424,
1582	};
1583	r.push(code, default_url.element());
1584	}
1585	Ok(multistatus(&[r], None))
1586	}
1587
1588	/// The id of the own calendar at `href` that can receive invitations:
1589	/// stored, not the inbox, taking events.
1590	async fn receiving_calendar(&self, href: &str) -> Result<Option<i64>, ApiError> {
1591	let Some(path) = href_path(href) else {
1592	return Ok(None);
1593	};
1594	let space = self.space();
1595	let slug = match path.strip_prefix(PIM).and_then(parse_target) {
1596	Some(Target::Collection(PimKind::Calendar, owner, slug))
1597	if owner.eq_ignore_ascii_case(&space.path) =>
1598	{
1599	slug
1600	}
1601	_ => return Ok(None),
1602	};
1603	Ok(self
1604	.collection(PimKind::Calendar, &slug)
1605	.await?
1606	.filter(\|c\| {
1607	c.access == Access::Own
1608	&& !generated(c.c.id)
1609	&& c.c.slug != INBOX
1610	&& c.c.components.split(',').any(\|x\| x == "VEVENT")
1611	})
1612	.map(\|c\| c.c.id))
1613	}
1614
1615	/// The owner changes the properties of its principal and homes, admins
1616	/// those of rooms and resources.
1617	fn may_edit(&self, s: &Space) -> bool {
1618	s.mine \|\| (self.me.admin && s.kind != UserType::Individual)
1619	}
1620
1621	async fn mkcol(&self, target: &Target, method: &str, body: Body) -> Reply {
1622	let Target::Collection(kind, _, slug) = target else {
1623	return Ok(status(StatusCode::METHOD_NOT_ALLOWED));
1624	};
1625	let space = self.space();
1626	if !space.mine {
1627	return Ok(denied(&space.home(*kind), "bind"));
1628	}
1629	let calendar = method == "MKCALENDAR";
1630	if calendar && *kind != PimKind::Calendar {
1631	return Ok(status(StatusCode::FORBIDDEN));
1632	}
1633	if self.collection(*kind, slug).await?.is_some() {
1634	return Ok(status(StatusCode::METHOD_NOT_ALLOWED));
1635	}
1636	// Names the home shows for lent and generated collections.
1637	if slug.starts_with(SHARED_PREFIX)
1638	\|\| [DIRECTORY_SLUG, BIRTHDAYS_SLUG, INBOX, OUTBOX].contains(&slug.as_str())
1639	\|\| slug.len() > MAX_SLUG
1640	{
1641	return Ok(status(StatusCode::FORBIDDEN));
1642	}
1643	let Some(body) = read_body(body, MAX_XML_SIZE).await else {
1644	return Ok(status(StatusCode::PAYLOAD_TOO_LARGE));
1645	};
1646	let Ok(update) = xml::update(&body) else {
1647	return Ok(status(StatusCode::BAD_REQUEST));
1648	};
1649	// A plain MKCOL makes a plain collection, which a calendar home cannot
1650	// hold. An address book home takes it as an address book.
1651	let typed = update
1652	.set
1653	.iter()
1654	.any(\|p\| Name::of(p).is(DAV, "resourcetype"));
1655	if !calendar && *kind == PimKind::Calendar && !typed {
1656	return Ok(status(StatusCode::FORBIDDEN));
1657	}
1658	let mut col = PimCollection {
1659	slug: slug.clone(),
1660	components: match kind {
1661	PimKind::Calendar => "VEVENT,VTODO,VJOURNAL".to_string(),
1662	PimKind::Addressbook => String::new(),
1663	},
1664	..Default::default()
1665	};
1666	let res = Res::Collection(
1667	*kind,
1668	Col {
1669	c: col.clone(),
1670	access: Access::Own,
1671	owner: space.principal(),
1672	},
1673	);
1674	let live: Vec<Name> = live_props(self.me, self.space, &res)
1675	.iter()
1676	.map(Name::of)
1677	.collect();
1678	let patch = apply(Some((*kind, &mut col)), &update, true, &live, &[]);
1679	if !patch.ok() {
1680	let root = match calendar {
1681	true => Name::new(CALDAV, "mkcalendar-response"),
1682	false => Name::new(DAV, "mkcol-response"),
1683	};
1684	let propstats = group(patch.results);
1685	return Ok(xml_response(
1686	StatusCode::FORBIDDEN,
1687	xml::propstat_document(&root, &propstats),
1688	));
1689	}
1690	let _lock = pim_schedule::LOCK.lock().await;
1691	let count = self.state.db.pim_collections(self.me.pid, *kind).await?;
1692	if count.iter().filter(\|c\| c.slug != INBOX).count() >= MAX_COLLECTIONS {
1693	return Ok(status(StatusCode::FORBIDDEN));
1694	}
1695	if !self
1696	.state
1697	.db
1698	.pim_create_collection(self.me.pid, *kind, &col, &patch.set)
1699	.await?
1700	{
1701	return Ok(status(StatusCode::METHOD_NOT_ALLOWED));
1702	}
1703	Ok(status(StatusCode::CREATED))
1704	}
1705	}
1706
1707	fn group(results: Vec<(u16, Element)>) -> Vec<(u16, Vec<Element>)> {
1708	let mut r = xml::Response::default();
1709	for (code, prop) in results {
1710	r.push(code, prop);
1711	}
1712	r.propstats
1713	}
1714
1715	/// A property update: each property with its status, and the client
1716	/// properties to store and remove.
1717	struct Patch {
1718	results: Vec<(u16, Element)>,
1719	set: Vec<DeadProp>,
1720	remove: Vec<(String, String)>,
1721	/// A property the server computes was named.
1722	protected: bool,
1723	}
1724
1725	impl Patch {
1726	fn ok(&self) -> bool {
1727	self.results.iter().all(\|(code, _)\| *code == 200)
1728	}
1729	}
1730
1731	/// DAV properties the server computes on some resource, beyond the ones
1732	/// `live` names for the resource at hand.
1733	const PROTECTED: [&str; 20] = [
1734	"acl",
1735	"alternate-URI-set",
1736	"creationdate",
1737	"current-user-principal",
1738	"current-user-privilege-set",
1739	"getcontentlength",
1740	"getcontenttype",
1741	"getetag",
1742	"getlastmodified",
1743	"group",
1744	"group-member-set",
1745	"group-membership",
1746	"lockdiscovery",
1747	"owner",
1748	"principal-URL",
1749	"principal-collection-set",
1750	"resourcetype",
1751	"supported-report-set",
1752	"supportedlock",
1753	"sync-token",
1754	];
1755
1756	/// Applies a PROPPATCH, MKCALENDAR or extended MKCOL body. A collection's
1757	/// own properties go into `col`. What the server computes (`live`, or a
1758	/// [`PROTECTED`] DAV property) is refused; anything else is stored as the
1759	/// client sent it, as clients expect of properties such as Apple's
1760	/// `default-alarm-vevent-date`. Nothing may be stored unless all of it is
1761	/// allowed: RFC 4918 makes PROPPATCH atomic.
1762	fn apply(
1763	mut col: Option<(PimKind, &mut PimCollection)>,
1764	update: &Update,
1765	creating: bool,
1766	live: &[Name],
1767	stored: &[DeadProp],
1768	) -> Patch {
1769	let mut patch = Patch {
1770	results: Vec::new(),
1771	set: Vec::new(),
1772	remove: Vec::new(),
1773	protected: false,
1774	};
1775	let is_protected =
1776	\|n: &Name\| live.contains(n) \|\| (n.ns == DAV && PROTECTED.contains(&n.local.as_str()));
1777	for p in &update.set {
1778	let name = Name::of(p);
1779	let xml = xml::document(p);
1780	let own = col
1781	.as_mut()
1782	.and_then(\|(kind, c)\| set_own(*kind, c, p, &name, creating));
1783	let code = match own {
1784	Some(false) => 403,
1785	None if is_protected(&name) => {
1786	patch.protected = true;
1787	403
1788	}
1789	_ if xml.len() > MAX_DEAD_SIZE => 507,
1790	Some(true) => 200,
1791	None => {
1792	patch.set.push(DeadProp {
1793	ns: name.ns.clone(),
1794	name: name.local.clone(),
1795	xml,
1796	});
1797	200
1798	}
1799	};
1800	patch.results.push((code, name.element()));
1801	}
1802	for name in &update.remove {
1803	let own = col
1804	.as_mut()
1805	.and_then(\|(kind, c)\| remove_own(*kind, c, name));
1806	let code = match own {
1807	Some(()) => 200,
1808	None if is_protected(name) => {
1809	patch.protected = true;
1810	403
1811	}
1812	None => {
1813	patch.remove.push((name.ns.clone(), name.local.clone()));
1814	200
1815	}
1816	};
1817	patch.results.push((code, name.element()));
1818	}
1819	let mut names: Vec<(&str, &str)> = stored
1820	.iter()
1821	.map(\|p\| (p.ns.as_str(), p.name.as_str()))
1822	.chain(patch.set.iter().map(\|p\| (p.ns.as_str(), p.name.as_str())))
1823	.filter(\|n\| {
1824	!patch
1825	.remove
1826	.iter()
1827	.any(\|(ns, l)\| (ns.as_str(), l.as_str()) == *n)
1828	})
1829	.collect();
1830	names.sort_unstable();
1831	names.dedup();
1832	let replaced = \|p: &DeadProp\| {
1833	patch
1834	.set
1835	.iter()
1836	.any(\|s\| (&s.ns, &s.name) == (&p.ns, &p.name))
1837	\|\| patch
1838	.remove
1839	.iter()
1840	.any(\|(ns, l)\| (ns, l) == (&p.ns, &p.name))
1841	};
1842	let size = stored
1843	.iter()
1844	.filter(\|p\| !replaced(p))
1845	.chain(&patch.set)
1846	.map(\|p\| p.xml.len())
1847	.sum::<usize>()
1848	+ col
1849	.as_ref()
1850	.and_then(\|(_, c)\| c.timezone.as_ref())
1851	.map_or(0, String::len);
1852	if names.len() > MAX_DEAD_PROPS \|\| size > MAX_DEAD_TOTAL {
1853	// Only what adds to the total is refused.
1854	for (code, prop) in patch.results.iter_mut().take(update.set.len()) {
1855	let n = Name::of(prop);
1856	if n.is(CALDAV, "calendar-timezone")
1857	\|\| patch.set.iter().any(\|p\| p.ns == n.ns && p.name == n.local)
1858	{
1859	*code = 507;
1860	}
1861	}
1862	}
1863	if !patch.ok() {
1864	for (code, _) in &mut patch.results {
1865	if *code == 200 {
1866	*code = 424;
1867	}
1868	}
1869	}
1870	patch
1871	}
1872
1873	/// `#rgb`, `#rrggbb` or `#rrggbbaa`: what clients write to `calendar-color`.
1874	/// `#rgb` is widened to `#rrggbb`.
1875	pub(super) fn color(v: &str) -> Option<String> {
1876	let hex = v
1877	.strip_prefix('#')
1878	.filter(\|h\| h.bytes().all(\|b\| b.is_ascii_hexdigit()))?;
1879	match hex.len() {
1880	3 => Some(format!(
1881	"#{}",
1882	hex.chars().flat_map(\|c\| [c, c]).collect::<String>()
1883	)),
1884	6 \| 8 => Some(v.to_string()),
1885	_ => None,
1886	}
1887	}
1888
1889	/// An integer order. Some clients write a fraction.
1890	fn order(v: &str) -> Option<String> {
1891	let n = v.parse::<f64>().ok().filter(\|n\| n.is_finite())?;
1892	Some((n.round() as i64).to_string())
1893	}
1894
1895	/// Sets one of a collection's own properties. `None` if it is none of them,
1896	/// `Some(valid)` otherwise.
1897	fn set_own(
1898	kind: PimKind,
1899	col: &mut PimCollection,
1900	p: &Element,
1901	name: &Name,
1902	creating: bool,
1903	) -> Option<bool> {
1904	let cal = kind == PimKind::Calendar;
1905	let value = \|\| Some(xml::text(p)).filter(\|v\| !v.is_empty());
1906	let set_text = \|field: &mut Option<String>, max: usize, lines: bool\| {
1907	let v = value();
1908	let valid = v.as_ref().is_none_or(\|v\| valid_text(v, max, lines));
1909	if valid {
1910	*field = v;
1911	}
1912	valid
1913	};
1914	let description = match cal {
1915	true => (CALDAV, "calendar-description"),
1916	false => (CARDDAV, "addressbook-description"),
1917	};
1918	Some(match (name.ns.as_str(), name.local.as_str()) {
1919	(DAV, "displayname") => set_text(&mut col.displayname, MAX_DISPLAYNAME, false),
1920	n if n == description => set_text(&mut col.description, MAX_DESCRIPTION, true),
1921	(APPLE, "calendar-color") if cal => match value() {
1922	None => {
1923	col.color = None;
1924	true
1925	}
1926	Some(v) => color(&v).map(\|c\| col.color = Some(c)).is_some(),
1927	},
1928	(APPLE, "calendar-order") if cal => match value() {
1929	None => {
1930	col.sort_order = None;
1931	true
1932	}
1933	Some(v) => order(&v).map(\|o\| col.sort_order = Some(o)).is_some(),
1934	},
1935	(CALDAV, "calendar-timezone") if cal => {
1936	let tz = value();
1937	let valid = tz.as_deref().is_none_or(is_timezone);
1938	if valid {
1939	col.timezone = tz;
1940	}
1941	valid
1942	}
1943	(CALDAV, "schedule-calendar-transp") if cal => {
1944	let transparent = xml::child(p, CALDAV, "transparent").is_some();
1945	let valid = transparent \|\| xml::child(p, CALDAV, "opaque").is_some();
1946	if valid {
1947	col.transparent = transparent;
1948	}
1949	valid
1950	}
1951	(DAV, "resourcetype") if creating => {
1952	let wanted = match kind {
1953	PimKind::Calendar => (CALDAV, "calendar"),
1954	PimKind::Addressbook => (CARDDAV, "addressbook"),
1955	};
1956	xml::child(p, wanted.0, wanted.1).is_some()
1957	}
1958	(CALDAV, "supported-calendar-component-set") if creating && cal => {
1959	let comps: Vec<_> = xml::elements(p)
1960	.filter(\|c\| Name::of(c).is(CALDAV, "comp"))
1961	.filter_map(\|c\| c.attributes.get("name"))
1962	.map(\|n\| n.to_ascii_uppercase())
1963	.collect();
1964	let valid = !comps.is_empty()
1965	&& comps
1966	.iter()
1967	.all(\|c\| ["VEVENT", "VTODO", "VJOURNAL"].contains(&c.as_str()));
1968	if valid {
1969	col.components = comps.join(",");
1970	}
1971	valid
1972	}
1973	_ => return None,
1974	})
1975	}
1976
1977	/// Removes one of a collection's own properties. `None` if it is none of
1978	/// them.
1979	fn remove_own(kind: PimKind, col: &mut PimCollection, name: &Name) -> Option<()> {
1980	let cal = kind == PimKind::Calendar;
1981	if cal && name.is(CALDAV, "schedule-calendar-transp") {
1982	col.transparent = false;
1983	return Some(());
1984	}
1985	let field = match (name.ns.as_str(), name.local.as_str()) {
1986	(DAV, "displayname") => &mut col.displayname,
1987	(CALDAV, "calendar-description") if cal => &mut col.description,
1988	(CARDDAV, "addressbook-description") if !cal => &mut col.description,
1989	(APPLE, "calendar-color") if cal => &mut col.color,
1990	(APPLE, "calendar-order") if cal => &mut col.sort_order,
1991	(CALDAV, "calendar-timezone") if cal => &mut col.timezone,
1992	_ => return None,
1993	};
1994	*field = None;
1995	Some(())
1996	}
1997
1998	/// A VCALENDAR holding a VTIMEZONE, as `calendar-timezone` must be.
1999	fn is_timezone(v: &str) -> bool {
2000	use pimdav::calcard::icalendar::{ICalendar, ICalendarComponentType};
2001	ICalendar::parse(v).is_ok_and(\|c\| {
2002	c.components
2003	.iter()
2004	.any(\|c\| c.component_type == ICalendarComponentType::VTimezone)
2005	})
2006	}
2007
2008	// ---------------------------------------------------------------------------
2009	// Objects
2010	// ---------------------------------------------------------------------------
2011
2012	impl Cx<'_> {
2013	async fn get(&self, target: &Target, headers: &HeaderMap, head: bool) -> Reply {
2014	let Target::Object(kind, _, slug, name) = target else {
2015	return self.get_collection(target, head).await;
2016	};
2017	let found = match self.collection(*kind, slug).await? {
2018	Some(col) => self.member(&col.c, name).await?,
2019	None => None,
2020	};
2021	let Some((o, mut data)) = found else {
2022	return Ok(status(StatusCode::NOT_FOUND));
2023	};
2024	if *kind == PimKind::Addressbook {
2025	let accept = headers.get("accept").and_then(\|v\| v.to_str().ok());
2026	let req = render::AddressData {
2027	props: None,
2028	version: Some(render::accepted_version(accept)),
2029	};
2030	data = blocking(move \|\| -> Result<_, ApiError> {
2031	Ok(render::address_data(&String::from_utf8_lossy(&data), &req).into_bytes())
2032	})
2033	.await?;
2034	}
2035	let length = data.len().to_string();
2036	let body = if head {
2037	Body::empty()
2038	} else {
2039	Body::from(data)
2040	};
2041	let mut r = (
2042	StatusCode::OK,
2043	[
2044	(CONTENT_TYPE, content_type(*kind, &o.component)),
2045	(ETAG, o.etag),
2046	(CONTENT_LENGTH, length),
2047	],
2048	body,
2049	)
2050	.into_response();
2051	with_schedule_tag(&mut r, o.schedule_tag.as_deref());
2052	Ok(r)
2053	}
2054
2055	/// Clients that discover with GET, as RFC 6764 allows, expect a 2xx on
2056	/// every collection on the way.
2057	async fn get_collection(&self, target: &Target, head: bool) -> Reply {
2058	if let Target::Collection(kind, _, slug) = target
2059	&& !(*kind == PimKind::Calendar && slug == OUTBOX && self.space().mine)
2060	&& self.collection(*kind, slug).await?.is_none()
2061	{
2062	return Ok(status(StatusCode::NOT_FOUND));
2063	}
2064	let text = "CalDAV and CardDAV collection. Open it with a calendar or contacts app.\n";
2065	Ok((
2066	StatusCode::OK,
2067	[
2068	(CONTENT_TYPE, "text/plain; charset=utf-8".to_string()),
2069	(CONTENT_LENGTH, text.len().to_string()),
2070	],
2071	if head { "" } else { text },
2072	)
2073	.into_response())
2074	}
2075
2076	async fn put(&self, target: &Target, headers: &HeaderMap, body: Body) -> Reply {
2077	let Target::Object(kind, _, slug, name) = target else {
2078	return Ok(status(StatusCode::METHOD_NOT_ALLOWED));
2079	};
2080	let Some(Col { c: col, access, .. }) = self.collection(*kind, slug).await? else {
2081	return Ok(status(StatusCode::CONFLICT));
2082	};
2083	let space = self.space();
2084	// The server alone delivers into the inbox.
2085	if access < Access::Write \|\| col.slug == INBOX {
2086	return Ok(denied(&space.collection(*kind, slug), "bind"));
2087	}
2088	let ns = kind_ns(*kind);
2089	let Some(data) = read_body(body, MAX_RESOURCE_SIZE).await else {
2090	return Ok(error(StatusCode::FORBIDDEN, el(ns, "max-resource-size")));
2091	};
2092	let (kind_c, components, name_c) = (*kind, col.components.clone(), name.clone());
2093	let (parsed, stamped, data) = blocking(move \|\| -> Result<_, ApiError> {
2094	let parsed = match kind_c {
2095	PimKind::Calendar => {
2096	let supported: Vec<&str> = components.split(',').collect();
2097	object::calendar(&data, &supported).map(\|o\| (o.uid, o.component.to_string()))
2098	}
2099	PimKind::Addressbook => {
2100	object::vcard(&data).map(\|uid\| (uid.unwrap_or(name_c), "VCARD".into()))
2101	}
2102	};
2103	let stamped = match (&parsed, kind_c) {
2104	(Ok(_), PimKind::Calendar) => object::with_dtstamp(&data, chrono::Utc::now()),
2105	_ => None,
2106	};
2107	Ok((parsed, stamped, data))
2108	})
2109	.await?;
2110	let (uid, component) = match parsed {
2111	Ok(v) => v,
2112	Err(invalid) => return Ok(error(StatusCode::FORBIDDEN, invalid.condition())),
2113	};
2114	let data = stamped.as_deref().unwrap_or(&data);
2115
2116	let _lock = pim_schedule::LOCK.lock().await;
2117	// A DELETE of the collection or of the share may have run meanwhile.
2118	let access = match self.collection(*kind, slug).await? {
2119	Some(now) if now.c.id == col.id => now.access,
2120	_ => return Ok(status(StatusCode::CONFLICT)),
2121	};
2122	if access < Access::Write {
2123	return Ok(denied(&space.collection(*kind, slug), "bind"));
2124	}
2125	let db = &self.state.db;
2126	let current = self.member(&col, name).await?;
2127	if current.is_none() && name.len() > MAX_SLUG {
2128	return Ok(status(StatusCode::FORBIDDEN));
2129	}
2130	if refuses(headers, current.as_ref().map(\|(o, _)\| o)) {
2131	return Ok(status(StatusCode::PRECONDITION_FAILED));
2132	}
2133	// A card stored without UID may gain one.
2134	let renamed = current.as_ref().is_some_and(\|(o, stored)\| {
2135	o.uid != uid
2136	&& (*kind == PimKind::Calendar \|\| object::vcard(stored).is_ok_and(\|u\| u.is_some()))
2137	});
2138	if renamed {
2139	return Ok(uid_conflict(ns, &space.object(*kind, slug, name)));
2140	}
2141	if let Some(holder) = db.pim_uid_holder(col.id, &uid, name).await? {
2142	return Ok(uid_conflict(ns, &space.object(*kind, slug, &holder)));
2143	}
2144	let stored = match kind {
2145	PimKind::Calendar => {
2146	let dir = Directory::load(self.state).await?;
2147	let owner = self.owner(&col, &dir).await?;
2148	let w = self.writer(&owner, access);
2149	let old = current.as_ref().map(\|(_, d)\| d.as_slice());
2150	match pim_schedule::put(self.state, &dir, &w, (col.id, name), old, data).await? {
2151	Ok(s) => s,
2152	Err(condition) => return Ok(error(StatusCode::FORBIDDEN, condition)),
2153	}
2154	}
2155	PimKind::Addressbook => pim_schedule::unchanged(data, None),
2156	};
2157	let etag = etag_of(&stored.data);
2158	let (changed, schedule_tag) = (stored.changed, stored.schedule_tag.clone());
2159	let obj = PimObject {
2160	name: name.clone(),
2161	uid,
2162	component,
2163	..Default::default()
2164	};
2165	db.pim_apply(&stored.into_ops(col.id, obj)).await?;
2166	let code = match current {
2167	Some(_) => StatusCode::NO_CONTENT,
2168	None => StatusCode::CREATED,
2169	};
2170	let mut r = status(code);
2171	// Only when the stored bytes are the request bytes (RFC 4791, 5.3.4).
2172	if !changed && stamped.is_none() {
2173	r.headers_mut()
2174	.insert(ETAG, etag.parse().expect("hex is a valid header"));
2175	}
2176	with_schedule_tag(&mut r, schedule_tag.as_deref());
2177	Ok(r)
2178	}
2179
2180	/// The signed-in account writing into a calendar of `owner`.
2181	fn writer<'a>(&self, owner: &'a PimPrincipal, access: Access) -> Writer<'a> {
2182	Writer::new(
2183	owner,
2184	self.me.pid,
2185	&self.me.name,
2186	access >= Access::Schedule,
2187	)
2188	}
2189
2190	/// The principal owning a collection, whose addresses decide how it takes
2191	/// part in the objects there.
2192	async fn owner(&self, col: &PimCollection, dir: &Directory) -> Result<PimPrincipal, ApiError> {
2193	let owner = match self.state.db.pim_collection_by_id(col.id).await? {
2194	Some((id, _, _)) => dir.get(id).cloned(),
2195	None => None,
2196	};
2197	owner.ok_or_else(\|\| ApiError::new(StatusCode::NOT_FOUND, "collection not found"))
2198	}
2199
2200	async fn delete(&self, target: &Target, headers: &HeaderMap) -> Reply {
2201	let (kind, slug, name) = match target {
2202	Target::Collection(k, _, s) => (k, s, None),
2203	Target::Object(k, _, s, n) => (k, s, Some(n)),
2204	_ => return Ok(status(StatusCode::FORBIDDEN)),
2205	};
2206	// Under the lock, so a revoked share applies at once. `delete_own`
2207	// takes it for a collection.
2208	let _lock = match name {
2209	Some(_) => Some(pim_schedule::LOCK.lock().await),
2210	None => None,
2211	};
2212	let Some(Col { c: col, access, .. }) = self.collection(*kind, slug).await? else {
2213	return Ok(status(StatusCode::NOT_FOUND));
2214	};
2215	let space = self.space();
2216	let href = space.collection(*kind, slug);
2217	let scheduling = *kind == PimKind::Calendar && col.slug != INBOX;
2218	let db = &self.state.db;
2219	let Some(name) = name else {
2220	return Ok(match access {
2221	Access::Own if *kind == PimKind::Calendar && col.slug == INBOX => {
2222	denied(&space.home(*kind), "unbind")
2223	}
2224	Access::Own => match delete_own(self.state, space.id, *kind, &col).await? {
2225	Ok(()) => status(StatusCode::NO_CONTENT),
2226	Err(condition) => error(StatusCode::FORBIDDEN, condition),
2227	},
2228	// Deleting a lent collection only takes it out of this home.
2229	_ if slug.starts_with(SHARED_PREFIX) && space.mine => {
2230	let _lock = pim_schedule::LOCK.lock().await;
2231	db.pim_remove_share(col.id, self.me.id).await?;
2232	status(StatusCode::NO_CONTENT)
2233	}
2234	_ => denied(&space.home(*kind), "unbind"),
2235	});
2236	};
2237	if access < Access::Write {
2238	return Ok(denied(&href, "unbind"));
2239	}
2240	let Some((obj, data)) = self.member(&col, name).await? else {
2241	return Ok(status(StatusCode::NOT_FOUND));
2242	};
2243	if refuses(headers, Some(&obj)) {
2244	return Ok(status(StatusCode::PRECONDITION_FAILED));
2245	}
2246	let mut ops = vec![PimOp::Delete {
2247	collection_id: col.id,
2248	name: name.clone(),
2249	}];
2250	if scheduling {
2251	let dir = Directory::load(self.state).await?;
2252	let owner = self.owner(&col, &dir).await?;
2253	let w = self.writer(&owner, access);
2254	let reply = headers.get("schedule-reply").and_then(\|v\| v.to_str().ok()) != Some("F");
2255	match pim_schedule::delete(self.state, &dir, &w, &data, reply).await? {
2256	Ok(more) => ops.extend(more),
2257	Err(condition) => return Ok(error(StatusCode::FORBIDDEN, condition)),
2258	}
2259	}
2260	db.pim_apply(&ops).await?;
2261	Ok(status(StatusCode::NO_CONTENT))
2262	}
2263	}
2264
2265	/// Whether If-Match, If-None-Match or If-Schedule-Tag-Match fails against
2266	/// the current object.
2267	fn refuses(headers: &HeaderMap, current: Option<&PimObject>) -> bool {
2268	if !precondition(headers).allows(current.map(\|o\| o.etag.as_str())) {
2269	return true;
2270	}
2271	headers
2272	.get("if-schedule-tag-match")
2273	.and_then(\|v\| v.to_str().ok())
2274	.is_some_and(\|tag\| current.and_then(\|o\| o.schedule_tag.as_deref()) != Some(tag.trim()))
2275	}
2276
2277	fn with_schedule_tag(r: &mut Response<Body>, tag: Option<&str>) {
2278	if let Some(v) = tag.and_then(\|t\| t.parse().ok()) {
2279	r.headers_mut().insert("schedule-tag", v);
2280	}
2281	}
2282
2283	fn precondition(headers: &HeaderMap) -> Precondition {
2284	let header = \|name: &str\| {
2285	headers
2286	.get(name)
2287	.and_then(\|v\| v.to_str().ok())
2288	.map(str::to_string)
2289	};
2290	Precondition {
2291	if_match: header("if-match"),
2292	if_none_match: header("if-none-match"),
2293	}
2294	}
2295
2296	// ---------------------------------------------------------------------------
2297	// REPORT
2298	// ---------------------------------------------------------------------------
2299
2300	impl Cx<'_> {
2301	async fn report(&self, target: &Target, body: Body) -> Reply {
2302	let Some(body) = read_body(body, MAX_XML_SIZE).await else {
2303	return Ok(status(StatusCode::PAYLOAD_TOO_LARGE));
2304	};
2305	let report = match report::parse(&body) {
2306	Ok(r) => r,
2307	Err(Refused::Invalid) => return Ok(status(StatusCode::BAD_REQUEST)),
2308	Err(Refused::Condition(c)) => return Ok(error(StatusCode::FORBIDDEN, c.element())),
2309	};
2310	let unsupported = \|\| Ok(error(StatusCode::FORBIDDEN, el(DAV, "supported-report")));
2311	let on_principals = matches!(
2312	target,
2313	Target::Root \| Target::Principals \| Target::Principal(_)
2314	);
2315	match report {
2316	Report::PrincipalSearch(search) if on_principals => {
2317	return self.principal_search(&search).await;
2318	}
2319	Report::PrincipalSearchPropertySet if on_principals => {
2320	return Ok(search_property_set());
2321	}
2322	Report::PrincipalSearch(_) \| Report::PrincipalSearchPropertySet => {
2323	return unsupported();
2324	}
2325	_ => {}
2326	}
2327	let Target::Collection(kind, _, slug) = target else {
2328	return unsupported();
2329	};
2330	let calendar_report = matches!(
2331	report,
2332	Report::CalendarMultiget { .. } \| Report::CalendarQuery { .. } \| Report::FreeBusy(_)
2333	);
2334	let card_report = matches!(
2335	report,
2336	Report::AddressbookMultiget { .. } \| Report::AddressbookQuery { .. }
2337	);
2338	if (calendar_report && *kind != PimKind::Calendar)
2339	\|\| (card_report && *kind != PimKind::Addressbook)
2340	{
2341	return unsupported();
2342	}
2343	let Some(Col { c: col, .. }) = self.collection(*kind, slug).await? else {
2344	return Ok(status(StatusCode::NOT_FOUND));
2345	};
2346	// Busy time comes from calendars, never from messages (RFC 6638, 2.3).
2347	if col.slug == INBOX && matches!(report, Report::FreeBusy(_)) {
2348	return unsupported();
2349	}
2350	let floating = col
2351	.timezone
2352	.as_deref()
2353	.and_then(zone::from_vtimezone)
2354	.unwrap_or(Zone::Utc);
2355	let mut out = Out {
2356	me: self.me.clone(),
2357	space: self.space().clone(),
2358	kind: *kind,
2359	col: col.clone(),
2360	expanded: 0,
2361	rendered: 0,
2362	};
2363
2364	match report {
2365	Report::CalendarMultiget { props, hrefs }
2366	\| Report::AddressbookMultiget { props, hrefs } => {
2367	let members = self.generated_members(&col).await?;
2368	let mut seen = HashSet::new();
2369	let mut found = Vec::new();
2370	let mut loaded = 0;
2371	let mut cut = false;
2372	for href in hrefs {
2373	if !seen.insert(href.clone()) {
2374	continue;
2375	}
2376	if found.len() >= MAX_MULTIGET_HREFS \|\| loaded > MAX_MULTIGET_BYTES {
2377	cut = true;
2378	break;
2379	}
2380	let hit = match self.own_object(*kind, &href) {
2381	Some((slug, name)) if slug == col.slug => match &members {
2382	Some(m) => m.get(&name).cloned(),
2383	None => self.state.db.pim_object(col.id, &name).await?,
2384	},
2385	_ => None,
2386	};
2387	loaded += hit.as_ref().map_or(0, \|(_, data)\| data.len());
2388	found.push((href, hit));
2389	}
2390	blocking(move \|\| -> Reply {
2391	let mut responses = Vec::new();
2392	for (href, hit) in found {
2393	if out.full() {
2394	cut = true;
2395	break;
2396	}
2397	responses.push(match hit {
2398	// The href as the client wrote it, so it can match it.
2399	Some((o, data)) => match out.object(&o, &data, &props, &floating) {
2400	Ok(r) => xml::Response { href, ..r },
2401	Err(TooManyInstances) => return Ok(too_many()),
2402	},
2403	None => xml::Response::status(href, 404),
2404	});
2405	}
2406	if cut {
2407	responses.push(out.over_limit());
2408	}
2409	Ok(multistatus(&responses, None))
2410	})
2411	.await
2412	}
2413	Report::CalendarQuery {
2414	props,
2415	filter,
2416	timezone,
2417	} => {
2418	let floating = timezone.unwrap_or(floating);
2419	let members = self.members(&col).await?;
2420	blocking(move \|\| -> Reply {
2421	let mut responses = Vec::new();
2422	for (o, data) in members {
2423	let Ok(cal) = ICalendar::parse(String::from_utf8_lossy(&data).as_ref())
2424	else {
2425	continue;
2426	};
2427	if !filter::matches_calendar(&cal, &filter, &floating) {
2428	continue;
2429	}
2430	if out.full() {
2431	responses.push(out.over_limit());
2432	break;
2433	}
2434	match out.object(&o, &data, &props, &floating) {
2435	Ok(r) => responses.push(r),
2436	Err(TooManyInstances) => return Ok(too_many()),
2437	}
2438	}
2439	Ok(multistatus(&responses, None))
2440	})
2441	.await
2442	}
2443	Report::AddressbookQuery {
2444	props,
2445	filter,
2446	limit,
2447	} => {
2448	let members = self.members(&col).await?;
2449	blocking(move \|\| -> Reply {
2450	let mut responses = Vec::new();
2451	let mut truncated = false;
2452	for (o, data) in members {
2453	let Ok(card) = VCard::parse(String::from_utf8_lossy(&data).as_ref()) else {
2454	continue;
2455	};
2456	if !filter::matches_card(&card, &filter) {
2457	continue;
2458	}
2459	if limit.is_some_and(\|n\| responses.len() >= n) \|\| out.full() {
2460	truncated = true;
2461	break;
2462	}
2463	if let Ok(r) = out.object(&o, &data, &props, &floating) {
2464	responses.push(r);
2465	}
2466	}
2467	if truncated {
2468	responses.push(out.over_limit());
2469	}
2470	Ok(multistatus(&responses, None))
2471	})
2472	.await
2473	}
2474	Report::SyncCollection {
2475	token,
2476	props,
2477	limit,
2478	} => {
2479	let (since, issued) = match token.is_empty() {
2480	true => (None, None),
2481	false => match parse_sync_token(&token) {
2482	// A generated collection has no change log: only its
2483	// current token is valid.
2484	Some((id, seq, None))
2485	if id == col.id && generated(id) && seq == col.seq =>
2486	{
2487	(Some(seq), None)
2488	}
2489	Some((id, seq, issued))
2490	if id == col.id
2491	&& !generated(id)
2492	&& seq <= col.seq
2493	&& issued.is_none_or(\|i\| seq <= i && i <= col.seq) =>
2494	{
2495	(Some(seq), issued)
2496	}
2497	_ => return Ok(invalid_sync_token()),
2498	},
2499	};
2500	// A generated collection has no change log to resume a cut
2501	// answer from. It is small, so it always answers in full.
2502	let limit = limit.filter(\|_\| !generated(col.id));
2503	// The changes come first: a write between the two reads then
2504	// only makes the next sync refetch a member.
2505	let mut changes = match generated(col.id) {
2506	true => Vec::new(),
2507	false => match self.state.db.pim_changes(col.id, since, issued).await? {
2508	Some(c) => c,
2509	None => return Ok(invalid_sync_token()),
2510	},
2511	};
2512	// An initial sync reads every member at once, not one per change.
2513	let mut members = match since {
2514	None => Some(self.member_map(&col).await?),
2515	Some(_) => None,
2516	};
2517	if let (Some(m), true) = (&members, generated(col.id)) {
2518	let mut names: Vec<_> = m.keys().cloned().collect();
2519	names.sort();
2520	changes = names.into_iter().map(\|n\| (n, col.seq, false)).collect();
2521	}
2522	// The client of a cut initial sync saw nothing deleted before it
2523	// began, so pruning up to there leaves its resume token valid.
2524	let issued = issued.or(since.is_none().then_some(col.seq));
2525	let truncated = limit.is_some_and(\|n\| changes.len() > n);
2526	if let Some(n) = limit {
2527	changes.truncate(n);
2528	}
2529	// A truncated answer hands out the token of its last change, so
2530	// the next sync resumes after it.
2531	let seq = match (truncated, changes.last()) {
2532	_ if generated(col.id) => col.seq,
2533	(true, Some((_, s, _))) => *s,
2534	(_, last) => col.seq.max(last.map_or(0, \|(_, s, _)\| *s)),
2535	};
2536	let mut found = Vec::with_capacity(changes.len());
2537	for (name, change, deleted) in changes {
2538	let hit = match (deleted, members.as_mut().and_then(\|m\| m.remove(&name))) {
2539	(true, _) => None,
2540	(false, Some(hit)) => Some(hit),
2541	// Written after the member map was read.
2542	(false, None) if !generated(col.id) => {
2543	self.state.db.pim_object(col.id, &name).await?
2544	}
2545	(false, None) => None,
2546	};
2547	found.push((name, change, hit));
2548	}
2549	let slug = col.slug.clone();
2550	let cuttable = !generated(col.id);
2551	blocking(move \|\| -> Reply {
2552	let (mut responses, mut seq, mut truncated) = (Vec::new(), seq, truncated);
2553	let mut last = seq;
2554	for (name, change, hit) in found {
2555	// Cut like a client limit: the token of the last change answered.
2556	if cuttable && out.full() {
2557	(seq, truncated) = (last, true);
2558	break;
2559	}
2560	last = change;
2561	responses.push(match hit {
2562	Some((o, data)) => match out.object(&o, &data, &props, &floating) {
2563	Ok(r) => r,
2564	Err(TooManyInstances) => return Ok(too_many()),
2565	},
2566	None => {
2567	xml::Response::status(out.space.object(out.kind, &slug, &name), 404)
2568	}
2569	});
2570	}
2571	if truncated {
2572	responses.push(out.over_limit());
2573	}
2574	// Past `issued`, the answer holds every change up to `seq`.
2575	let token = sync_token(col.id, seq, issued.filter(\|&i\| truncated && seq <= i));
2576	Ok(multistatus(
2577	&responses,
2578	Some(with_text(el(DAV, "sync-token"), token)),
2579	))
2580	})
2581	.await
2582	}
2583	Report::FreeBusy(range) => {
2584	let members = self.members(&col).await?;
2585	blocking(move \|\| -> Reply {
2586	let mut busy = Vec::new();
2587	for (_, data) in members {
2588	if let Ok(cal) = ICalendar::parse(String::from_utf8_lossy(&data).as_ref()) {
2589	// ponytail: one period per instance, so a long range over
2590	// a frequent series makes a long answer.
2591	busy.extend(freebusy::busy(&cal, &range, &floating, None));
2592	}
2593	}
2594	let body =
2595	freebusy::vfreebusy(&freebusy::merge(busy), &range, chrono::Utc::now());
2596	Ok((
2597	StatusCode::OK,
2598	[(CONTENT_TYPE, "text/calendar; charset=utf-8")],
2599	body,
2600	)
2601	.into_response())
2602	})
2603	.await
2604	}
2605	Report::PrincipalSearch(_) \| Report::PrincipalSearchPropertySet => {
2606	unreachable!("answered above")
2607	}
2608	}
2609	}
2610
2611	/// principal-property-search and calendarserver-principal-search.
2612	async fn principal_search(&self, search: &Search) -> Reply {
2613	let mut responses = Vec::new();
2614	let mut truncated = false;
2615	for p in self.state.db.pim_principals(true).await? {
2616	let view = Space::of(&p, self.me);
2617	let addresses = view.addresses();
2618	let candidate = Principal {
2619	name: &p.name,
2620	display: p.display(),
2621	addresses: &addresses,
2622	kind: p.kind,
2623	};
2624	if !search.matches(&candidate) {
2625	continue;
2626	}
2627	if search.limit.is_some_and(\|n\| responses.len() >= n) {
2628	truncated = true;
2629	break;
2630	}
2631	let href = principal_href(&p.name);
2632	responses.push(select(
2633	href,
2634	&search.find,
2635	live_props(self.me, self.space, &Res::Principal(view)),
2636	));
2637	}
2638	if truncated {
2639	let mut r = xml::Response::status(format!("{PIM}/principals/"), 507);
2640	r.error = Some(el(DAV, "number-of-matches-within-limits"));
2641	responses.push(r);
2642	}
2643	Ok(multistatus(&responses, None))
2644	}
2645
2646	/// `(collection slug, object name)` of an href to an object of `kind` in
2647	/// the space of this request. Takes a path or a full URL.
2648	fn own_object(&self, kind: PimKind, href: &str) -> Option<(String, String)> {
2649	let space = self.space?;
2650	match parse_target(href_path(href)?.strip_prefix(PIM)?)? {
2651	Target::Object(k, owner, slug, name)
2652	if k == kind && owner.eq_ignore_ascii_case(&space.path) =>
2653	{
2654	Some((slug, name))
2655	}
2656	_ => None,
2657	}
2658	}
2659	}
2660
2661	fn search_property_set() -> Response<Body> {
2662	let body = xml::document(&with_children(
2663	el(DAV, "principal-search-property-set"),
2664	principal::SEARCHABLE.map(\|(ns, local, description)\| {
2665	with_children(
2666	el(DAV, "principal-search-property"),
2667	[
2668	with_children(el(DAV, "prop"), [el(ns, local)]),
2669	with_attr(
2670	with_text(el(DAV, "description"), description),
2671	"xml:lang",
2672	"en",
2673	),
2674	],
2675	)
2676	}),
2677	));
2678	xml_response(StatusCode::OK, body)
2679	}
2680
2681	/// Instances `expand` may produce for one REPORT answer, across its objects.
2682	/// Beyond it the answer is cut short with a 507, as for a client limit.
2683	const MAX_EXPANDED_PER_ANSWER: usize = 20_000;
2684
2685	/// Bytes of calendar-data and address-data one REPORT answer may carry.
2686	/// Beyond them it is cut short with a 507 too.
2687	const MAX_RENDERED_PER_ANSWER: usize = 64 * 1024 * 1024;
2688
2689	/// Hrefs and object bytes one multiget loads. Beyond them it answers 507.
2690	const MAX_MULTIGET_HREFS: usize = 1000;
2691	const MAX_MULTIGET_BYTES: usize = 32 * 1024 * 1024;
2692
2693	/// What a REPORT answer about one collection needs. Owned, so the answer
2694	/// can be built on the blocking pool.
2695	struct Out {
2696	me: Me,
2697	space: Space,
2698	kind: PimKind,
2699	col: PimCollection,
2700	/// Instances `expand` produced for this answer so far.
2701	expanded: usize,
2702	/// Bytes of object data rendered for this answer so far.
2703	rendered: usize,
2704	}
2705
2706	impl Out {
2707	fn object(
2708	&mut self,
2709	o: &PimObject,
2710	data: &[u8],
2711	props: &Props,
2712	floating: &Zone,
2713	) -> Result<xml::Response, TooManyInstances> {
2714	let mut all = live_props(
2715	&self.me,
2716	Some(&self.space),
2717	&Res::Object(self.kind, o.clone()),
2718	);
2719	let raw = String::from_utf8_lossy(data);
2720	if let Some(req) = &props.calendar {
2721	let (text, instances) = render::calendar_data(&raw, req, floating)?;
2722	self.expanded += instances;
2723	self.rendered += text.len();
2724	all.push(with_text(el(CALDAV, "calendar-data"), text));
2725	}
2726	if let Some(req) = &props.address {
2727	let text = render::address_data(&raw, req);
2728	self.rendered += text.len();
2729	all.push(with_text(el(CARDDAV, "address-data"), text));
2730	}
2731	let href = self.space.object(self.kind, &self.col.slug, &o.name);
2732	Ok(select(href, &props.find, all))
2733	}
2734
2735	fn full(&self) -> bool {
2736	self.expanded > MAX_EXPANDED_PER_ANSWER \|\| self.rendered > MAX_RENDERED_PER_ANSWER
2737	}
2738
2739	/// The response a query or sync adds when a limit cut it short.
2740	fn over_limit(&self) -> xml::Response {
2741	let href = self.space.collection(self.kind, &self.col.slug);
2742	let mut r = xml::Response::status(href, 507);
2743	r.error = Some(el(DAV, "number-of-matches-within-limits"));
2744	r
2745	}
2746	}
2747
2748	fn invalid_sync_token() -> Response<Body> {
2749	error(StatusCode::FORBIDDEN, el(DAV, "valid-sync-token"))
2750	}
2751
2752	fn too_many() -> Response<Body> {
2753	error(StatusCode::FORBIDDEN, el(CALDAV, "max-instances"))
2754	}
2755
2756	/// `(collection id, seq, issued)` of a token [`sync_token`] made.
2757	fn parse_sync_token(token: &str) -> Option<(i64, i64, Option<i64>)> {
2758	let rest = token.strip_prefix("urn:dovenest:sync:")?;
2759	let (rest, issued) = match rest.split_once('.') {
2760	Some((r, i)) => (r, Some(i.parse().ok()?)),
2761	None => (rest, None),
2762	};
2763	// The birthday calendar's id is negative.
2764	let (id, seq) = rest.rsplit_once('-')?;
2765	Some((id.parse().ok()?, seq.parse().ok()?, issued))
2766	}
2767
2768	// ---------------------------------------------------------------------------
2769	// POST
2770	// ---------------------------------------------------------------------------
2771
2772	impl Cx<'_> {
2773	/// A free-busy request to the own scheduling outbox (RFC 6638, 5).
2774	async fn post(&self, target: &Target, body: Body) -> Reply {
2775	let space = match target {
2776	Target::Collection(PimKind::Calendar, _, slug) if slug == OUTBOX => self.space(),
2777	_ => return Ok(status(StatusCode::METHOD_NOT_ALLOWED)),
2778	};
2779	if !space.mine {
2780	let href = space.collection(PimKind::Calendar, OUTBOX);
2781	return Ok(error(
2782	StatusCode::FORBIDDEN,
2783	need_privilege(&href, CALDAV, "schedule-send-freebusy"),
2784	));
2785	}
2786	let Some(body) = read_body(body, MAX_XML_SIZE).await else {
2787	return Ok(status(StatusCode::PAYLOAD_TOO_LARGE));
2788	};
2789	let request = match freebusy::request(&body) {
2790	Ok(r) => r,
2791	Err(condition) => return Ok(error(StatusCode::FORBIDDEN, condition.element())),
2792	};
2793	let dir = Directory::load(self.state).await?;
2794	if !dir.is(self.me.pid)(&request.organizer) {
2795	return Ok(error(
2796	StatusCode::FORBIDDEN,
2797	el(CALDAV, "organizer-allowed"),
2798	));
2799	}
2800	let answers = pim_schedule::free_busy(self.state, &dir, &request).await?;
2801	Ok(xml_response(
2802	StatusCode::OK,
2803	freebusy::schedule_response(&answers),
2804	))
2805	}
2806	}
2807
2808	// ---------------------------------------------------------------------------
2809	// MOVE
2810	// ---------------------------------------------------------------------------
2811
2812	impl Cx<'_> {
2813	async fn move_object(&self, target: &Target, headers: &HeaderMap) -> Reply {
2814	let Target::Object(kind, _, slug, name) = target else {
2815	return Ok(status(StatusCode::METHOD_NOT_ALLOWED));
2816	};
2817	let destination = headers.get("destination").and_then(\|v\| v.to_str().ok());
2818	let Some((to_slug, to_name)) = destination.and_then(\|d\| self.own_object(*kind, d)) else {
2819	return Ok(status(StatusCode::FORBIDDEN));
2820	};
2821	if (&to_slug, &to_name) == (slug, name) {
2822	return Ok(status(StatusCode::FORBIDDEN));
2823	}
2824	let space = self.space();
2825	let _lock = pim_schedule::LOCK.lock().await;
2826	let Some(from) = self.collection(*kind, slug).await? else {
2827	return Ok(status(StatusCode::NOT_FOUND));
2828	};
2829	let Some(to) = self.collection(*kind, &to_slug).await? else {
2830	return Ok(status(StatusCode::CONFLICT));
2831	};
2832	if from.access < Access::Write \|\| from.c.slug == INBOX {
2833	return Ok(denied(&space.collection(*kind, slug), "unbind"));
2834	}
2835	if to.access < Access::Write \|\| to.c.slug == INBOX {
2836	return Ok(denied(&space.collection(*kind, &to_slug), "bind"));
2837	}
2838	// A meeting stays in its organizer's calendars (`elsewhere` allows one
2839	// scheduling object per UID and principal), so an object never changes owner. Clients fall back to
2840	// PUT and DELETE, which schedule as usual.
2841	if !from.owner.eq_ignore_ascii_case(&to.owner) {
2842	return Ok(status(StatusCode::FORBIDDEN));
2843	}
2844	let Some((obj, _)) = self.member(&from.c, name).await? else {
2845	return Ok(status(StatusCode::NOT_FOUND));
2846	};
2847	// Moving between calendars schedules nothing (RFC 6638, 3.2.3.4).
2848	if refuses(headers, Some(&obj)) {
2849	return Ok(status(StatusCode::PRECONDITION_FAILED));
2850	}
2851	if *kind == PimKind::Calendar && !to.c.components.split(',').any(\|c\| c == obj.component) {
2852	return Ok(error(
2853	StatusCode::FORBIDDEN,
2854	el(CALDAV, "supported-calendar-component"),
2855	));
2856	}
2857	let overwrite = !headers
2858	.get("overwrite")
2859	.is_some_and(\|v\| v.as_bytes().eq_ignore_ascii_case(b"F"));
2860	let target = self.member(&to.c, &to_name).await?;
2861	if target.is_none() && to_name.len() > MAX_SLUG {
2862	return Ok(status(StatusCode::FORBIDDEN));
2863	}
2864	// Overwriting a meeting would drop it without telling its attendees.
2865	if overwrite && target.is_some_and(\|(o, _)\| o.schedule_tag.is_some()) {
2866	return Ok(status(StatusCode::FORBIDDEN));
2867	}
2868	let written = self
2869	.state
2870	.db
2871	.pim_move_object(
2872	from.c.id,
2873	name,
2874	to.c.id,
2875	&to_name,
2876	overwrite,
2877	&precondition(headers),
2878	)
2879	.await?;
2880	let tagged = \|code\| {
2881	let mut r = status(code);
2882	with_schedule_tag(&mut r, obj.schedule_tag.as_deref());
2883	r
2884	};
2885	Ok(match written {
2886	PimWrite::Created => tagged(StatusCode::CREATED),
2887	PimWrite::Updated => tagged(StatusCode::NO_CONTENT),
2888	PimWrite::NotFound => status(StatusCode::NOT_FOUND),
2889	PimWrite::PreconditionFailed => status(StatusCode::PRECONDITION_FAILED),
2890	PimWrite::UidConflict(holder) => {
2891	uid_conflict(kind_ns(kind), &space.object(kind, &to_slug, &holder))
2892	}
2893	})
2894	}
2895	}
2896