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