version 0.12.3

Add truncation for automatically derived timezones
version 0.12.2
2026-01-30 21:18:19 +00:00 · 2026-01-24 22:49:02 +01:00 · 2026-01-24 22:48:08 +01:00 · 2026-01-24 20:09:42 +01:00 · 2026-01-24 20:07:38 +01:00 · 2026-01-24 19:52:13 +01:00
53 changed files with 553 additions and 329 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -181,9 +181,9 @@ dependencies = [

 [[package]]
 name = "askama_web"
-version = "0.15.0"
+version = "0.15.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0d6576f8e59513752a3e2673ca602fb403be7d0d0aacba5cd8b219838ab58fe"
+checksum = "5911a65ac3916ef133167a855d52978f9fbf54680a093e0ef29e20b7e94a4523"
 dependencies = [
 "askama",
 "askama_web_derive",
@@ -565,6 +565,24 @@ version = "1.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b35204fbdc0b3f4446b89fc1ac2cf84a8a68971995d0bf2e925ec7cd960f9cb3"

+[[package]]
+name = "caldata"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f36de4a8034d98c95e7fe874b828272d823cfbd68e9571fe7bf6c419e852cbe2"
+dependencies = [
+ "chrono",
+ "chrono-tz",
+ "derive_more",
+ "itertools 0.14.0",
+ "lazy_static",
+ "phf 0.13.1",
+ "regex",
+ "rrule",
+ "thiserror 2.0.18",
+ "vtimezones-rs",
+]
+
 [[package]]
 name = "cast"
 version = "0.3.0"
@@ -573,9 +591,9 @@ checksum = "37b2a672a2cb129a2e41c10b1224bb368f9f37a2b16b612598138befd7b37eb5"

 [[package]]
 name = "cc"
-version = "1.2.53"
+version = "1.2.54"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "755d2fce177175ffca841e9a06afdb2c4ab0f593d53b4dee48147dfaade85932"
+checksum = "6354c81bbfd62d9cfa9cb3c773c2b7b2a3a482d569de977fd0e961f6e7c00583"
 dependencies = [
 "find-msvc-tools",
 "shlex",
@@ -1768,22 +1786,6 @@ dependencies = [
 "cc",
 ]

-[[package]]
-name = "ical"
-version = "0.12.0-dev"
-source = "git+https://github.com/lennart-k/ical-rs?branch=dev#8697656303f182ce173efdaf6aa7e842ffdb3f33"
-dependencies = [
- "chrono",
- "chrono-tz",
- "derive_more",
- "itertools 0.14.0",
- "lazy_static",
- "phf 0.13.1",
- "regex",
- "rrule",
- "thiserror 2.0.18",
-]
-
 [[package]]
 name = "icu_collections"
 version = "2.1.1"
@@ -2025,9 +2027,9 @@ checksum = "bcc35a38544a891a5f7c865aca548a982ccb3b8650a5b06d0fd33a10283c56fc"

 [[package]]
 name = "libm"
-version = "0.2.15"
+version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9fbbcab51052fe104eb5e5d351cf728d30a5be1fe14d9be8a3b097481fb97de"
+checksum = "b6d2cec3eae94f9f509c767b45932f1ada8350c4bdb85af2fcab4a3c14807981"

 [[package]]
 name = "libredox"
@@ -2200,9 +2202,9 @@ dependencies = [

 [[package]]
 name = "num-conv"
-version = "0.1.0"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "51d515d32fb182ee37cda2ccdcb92950d6a3c2893aa280e540671c2cd0f3b1d9"
+checksum = "cf97ec579c3c42f953ef76dbf8d55ac91fb219dde70e49aa4a6b7d74e9919050"

 [[package]]
 name = "num-integer"
@@ -2610,22 +2612,12 @@ dependencies = [

 [[package]]
 name = "phf_codegen"
-version = "0.12.1"
+version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "efbdcb6f01d193b17f0b9c3360fa7e0e620991b193ff08702f78b3ce365d7e61"
+checksum = "49aa7f9d80421bca176ca8dbfebe668cc7a2684708594ec9f3c0db0805d5d6e1"
 dependencies = [
- "phf_generator 0.12.1",
- "phf_shared 0.12.1",
-]
-
-[[package]]
-name = "phf_generator"
-version = "0.12.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2cbb1126afed61dd6368748dae63b1ee7dc480191c6262a3b4ff1e29d86a6c5b"
-dependencies = [
- "fastrand",
- "phf_shared 0.12.1",
+ "phf_generator",
+ "phf_shared 0.13.1",
 ]

 [[package]]
@@ -2644,7 +2636,7 @@ version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "812f032b54b1e759ccd5f8b6677695d5268c588701effba24601f6932f8269ef"
 dependencies = [
- "phf_generator 0.13.1",
+ "phf_generator",
 "phf_shared 0.13.1",
 "proc-macro2",
 "quote",
@@ -2825,9 +2817,9 @@ dependencies = [

 [[package]]
 name = "proc-macro2"
-version = "1.0.105"
+version = "1.0.106"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "535d180e0ecab6268a3e718bb9fd44db66bbbc256257165fc699dadf70d16fe7"
+checksum = "8fd00f0bb2e90d81d1044c2b32617f68fcb9fa3bb7640c23e9c748e53fb30934"
 dependencies = [
 "unicode-ident",
 ]
@@ -2934,9 +2926,9 @@ dependencies = [

 [[package]]
 name = "quote"
-version = "1.0.43"
+version = "1.0.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc74d9a594b72ae6656596548f56f667211f8a97b3d4c3d467150794690dc40a"
+checksum = "21b2ebcf727b7760c461f091f9f0f539b77b8e87f2fd88131e7f1b433b3cece4"
 dependencies = [
 "proc-macro2",
 ]
@@ -3317,18 +3309,18 @@ dependencies = [

 [[package]]
 name = "rustical"
-version = "0.11.17"
+version = "0.12.3"
 dependencies = [
 "anyhow",
 "argon2",
 "async-trait",
 "axum",
 "axum-extra",
+ "caldata",
 "clap",
 "figment",
 "headers",
 "http",
- "ical",
 "insta",
 "opentelemetry",
 "opentelemetry-otlp",
@@ -3364,20 +3356,20 @@ dependencies = [

 [[package]]
 name = "rustical_caldav"
-version = "0.11.17"
+version = "0.12.3"
 dependencies = [
 "async-std",
 "async-trait",
 "axum",
 "axum-extra",
 "base64 0.22.1",
+ "caldata",
 "chrono",
 "chrono-tz",
 "derive_more",
 "futures-util",
 "headers",
 "http",
- "ical",
 "insta",
 "percent-encoding",
 "quick-xml",
@@ -3406,17 +3398,17 @@ dependencies = [

 [[package]]
 name = "rustical_carddav"
-version = "0.11.17"
+version = "0.12.3"
 dependencies = [
 "async-trait",
 "axum",
 "axum-extra",
 "base64 0.22.1",
+ "caldata",
 "chrono",
 "derive_more",
 "futures-util",
 "http",
- "ical",
 "insta",
 "percent-encoding",
 "quick-xml",
@@ -3440,16 +3432,16 @@ dependencies = [

 [[package]]
 name = "rustical_dav"
-version = "0.11.17"
+version = "0.12.3"
 dependencies = [
 "async-trait",
 "axum",
 "axum-extra",
+ "caldata",
 "derive_more",
 "futures-util",
 "headers",
 "http",
- "ical",
 "itertools 0.14.0",
 "log",
 "matchit 0.9.1",
@@ -3466,7 +3458,7 @@ dependencies = [

 [[package]]
 name = "rustical_dav_push"
-version = "0.11.17"
+version = "0.12.3"
 dependencies = [
 "async-trait",
 "axum",
@@ -3491,7 +3483,7 @@ dependencies = [

 [[package]]
 name = "rustical_frontend"
-version = "0.11.17"
+version = "0.12.3"
 dependencies = [
 "askama",
 "askama_web",
@@ -3527,13 +3519,13 @@ dependencies = [

 [[package]]
 name = "rustical_ical"
-version = "0.11.17"
+version = "0.12.3"
 dependencies = [
 "axum",
+ "caldata",
 "chrono",
 "chrono-tz",
 "derive_more",
- "ical",
 "regex",
 "rrule",
 "rstest",
@@ -3546,7 +3538,7 @@ dependencies = [

 [[package]]
 name = "rustical_oidc"
-version = "0.11.17"
+version = "0.12.3"
 dependencies = [
 "async-trait",
 "axum",
@@ -3562,11 +3554,12 @@ dependencies = [

 [[package]]
 name = "rustical_store"
-version = "0.11.17"
+version = "0.12.3"
 dependencies = [
 "anyhow",
 "async-trait",
 "axum",
+ "caldata",
 "chrono",
 "chrono-tz",
 "clap",
@@ -3574,7 +3567,6 @@ dependencies = [
 "futures-core",
 "headers",
 "http",
- "ical",
 "regex",
 "rrule",
 "rstest",
@@ -3595,13 +3587,13 @@ dependencies = [

 [[package]]
 name = "rustical_store_sqlite"
-version = "0.11.17"
+version = "0.12.3"
 dependencies = [
 "async-trait",
+ "caldata",
 "chrono",
 "criterion",
 "derive_more",
- "ical",
 "password-auth",
 "password-hash",
 "pbkdf2",
@@ -3620,7 +3612,7 @@ dependencies = [

 [[package]]
 name = "rustical_xml"
-version = "0.11.17"
+version = "0.12.3"
 dependencies = [
 "quick-xml",
 "thiserror 2.0.18",
@@ -3980,9 +3972,9 @@ dependencies = [

 [[package]]
 name = "socket2"
-version = "0.6.1"
+version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "17129e116933cf371d018bb80ae557e889637989d8638274fb25622827b03881"
+checksum = "86f4aa3ad99f2088c990dfa82d367e19cb29268ed67c574d10d0a4bfe71f07e0"
 dependencies = [
 "libc",
 "windows-sys 0.60.2",
@@ -4356,9 +4348,9 @@ dependencies = [

 [[package]]
 name = "time"
-version = "0.3.45"
+version = "0.3.46"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9e442fc33d7fdb45aa9bfeb312c095964abdf596f7567261062b2a7107aaabd"
+checksum = "9da98b7d9b7dad93488a84b8248efc35352b0b2657397d4167e7ad67e5d535e5"
 dependencies = [
 "deranged",
 "itoa",
@@ -4371,15 +4363,15 @@ dependencies = [

 [[package]]
 name = "time-core"
-version = "0.1.7"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b36ee98fd31ec7426d599183e8fe26932a8dc1fb76ddb6214d05493377d34ca"
+checksum = "7694e1cfe791f8d31026952abf09c69ca6f6fa4e1a1229e18988f06a04a12dca"

 [[package]]
 name = "time-macros"
-version = "0.2.25"
+version = "0.2.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "71e552d1249bf61ac2a52db88179fd0673def1e1ad8243a00d9ec9ed71fee3dd"
+checksum = "78cc610bac2dcee56805c99642447d4c5dbde4d01f752ffea0199aee1f601dc4"
 dependencies = [
 "num-conv",
 "time-core",
@@ -4951,12 +4943,12 @@ checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"

 [[package]]
 name = "vtimezones-rs"
-version = "0.2.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6728de8767c8dea44f41b88115a205ed23adc3302e1b4342be59d922934dae5"
+checksum = "1e4e9cf6888a927b6cec4aa2416f379885b92dd2aa4476bc83718fe58051f67e"
 dependencies = [
 "glob",
- "phf 0.12.1",
+ "phf 0.13.1",
 "phf_codegen",
 ]

@@ -5442,7 +5434,7 @@ checksum = "9edde0db4769d2dc68579893f2306b26c6ecfbe0ef499b013d731b7b9247e0b9"

 [[package]]
 name = "xml_derive"
-version = "0.11.17"
+version = "0.12.3"
 dependencies = [
 "darling 0.23.0",
 "heck",
@@ -5563,6 +5555,6 @@ dependencies = [

 [[package]]
 name = "zmij"
-version = "1.0.15"
+version = "1.0.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "94f63c051f4fe3c1509da62131a678643c5b6fbdc9273b2b79d4378ebda003d2"
+checksum = "dfcd145825aace48cff44a8844de64bf75feec3080e0aa5cdbde72961ae51a65"
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 members = ["crates/*"]

 [workspace.package]
-version = "0.11.17"
+version = "0.12.3"
 rust-version = "1.92"
 edition = "2024"
 description = "A CalDAV server"
@@ -107,9 +107,7 @@ strum = "0.27"
 strum_macros = "0.27"
 serde_json = { version = "1.0", features = ["raw_value"] }
 sqlx-sqlite = { version = "0.8", features = ["bundled"] }
-ical = { git = "https://github.com/lennart-k/ical-rs", branch = "dev", features = [
-  "chrono-tz",
-] }
+caldata = { version = "0.14.0", features = ["chrono-tz", "vtimezones-rs"] }
 toml = "0.9"
 tower = "0.5"
 tower-http = { version = "0.6", features = [
@@ -139,7 +137,7 @@ reqwest = { version = "0.12", features = [
 openidconnect = "4.0"
 clap = { version = "4.5", features = ["derive", "env"] }
 matchit-serde = { git = "https://github.com/lennart-k/matchit-serde", rev = "e18e65d7" }
-vtimezones-rs = "0.2"
+vtimezones-rs = "0.3"
 ece = { version = "2.3", default-features = false, features = [
  "backend-openssl",
 ] }
@@ -161,7 +159,7 @@ rustical_store_sqlite.workspace = true
 rustical_caldav.workspace = true
 rustical_carddav.workspace = true
 rustical_frontend.workspace = true
-ical.workspace = true
+caldata.workspace = true
 toml.workspace = true
 serde.workspace = true
 tokio.workspace = true
--- a/crates/caldav/Cargo.toml
+++ b/crates/caldav/Cargo.toml
@@ -34,7 +34,7 @@ rustical_store.workspace = true
 chrono.workspace = true
 chrono-tz.workspace = true
 sha2.workspace = true
-ical.workspace = true
+caldata.workspace = true
 percent-encoding.workspace = true
 rustical_xml.workspace = true
 uuid.workspace = true
--- a/crates/caldav/src/calendar/methods/get.rs
+++ b/crates/caldav/src/calendar/methods/get.rs
@@ -3,11 +3,11 @@ use crate::calendar::CalendarResourceService;
 use axum::body::Body;
 use axum::extract::State;
 use axum::{extract::Path, response::Response};
+use caldata::component::IcalCalendar;
+use caldata::generator::Emitter;
+use caldata::parser::ContentLine;
 use headers::{ContentType, HeaderMapExt};
 use http::{HeaderValue, Method, StatusCode, header};
-use ical::component::IcalCalendar;
-use ical::generator::Emitter;
-use ical::property::ContentLine;
 use percent_encoding::{CONTROLS, utf8_percent_encode};
 use rustical_store::{CalendarStore, SubscriptionStore, auth::Principal};
 use std::str::FromStr;
--- a/crates/caldav/src/calendar/methods/import.rs
+++ b/crates/caldav/src/calendar/methods/import.rs
@@ -4,8 +4,9 @@ use axum::{
    extract::{Path, State},
    response::{IntoResponse, Response},
 };
+use caldata::component::{Component, ComponentMut};
+use caldata::{IcalParser, parser::ParserOptions};
 use http::StatusCode;
-use ical::parser::{Component, ComponentMut};
 use rustical_dav::header::Overwrite;
 use rustical_ical::CalendarObjectType;
 use rustical_store::{
@@ -25,7 +26,7 @@ pub async fn route_import<C: CalendarStore, S: SubscriptionStore>(
        return Err(Error::Unauthorized);
    }

-    let parser = ical::IcalParser::from_slice(body.as_bytes());
+    let parser = IcalParser::from_slice(body.as_bytes());
    let mut cal = match parser.expect_one() {
        Ok(cal) => cal.mutable(),
        Err(err) => return Ok((StatusCode::BAD_REQUEST, err.to_string()).into_response()),
@@ -49,7 +50,7 @@ pub async fn route_import<C: CalendarStore, S: SubscriptionStore>(
    cal.remove_property("X-WR-CALDESC");
    cal.remove_property("X-WR-CALCOLOR");
    cal.remove_property("X-WR-TIMEZONE");
-    let cal = cal.build(None).unwrap();
+    let cal = cal.build(&ParserOptions::default(), None).unwrap();

    // Make sure timezone is valid
    if let Some(timezone_id) = timezone_id.as_ref() {
--- a/crates/caldav/src/calendar/methods/mkcalendar.rs
+++ b/crates/caldav/src/calendar/methods/mkcalendar.rs
@@ -1,10 +1,13 @@
+use std::str::FromStr;
+
 use crate::Error;
 use crate::calendar::CalendarResourceService;
 use crate::calendar::prop::SupportedCalendarComponentSet;
+use crate::error::Precondition;
 use axum::extract::{Path, State};
 use axum::response::{IntoResponse, Response};
+use caldata::IcalParser;
 use http::{Method, StatusCode};
-use ical::IcalParser;
 use rustical_dav::xml::HrefElement;
 use rustical_ical::CalendarObjectType;
 use rustical_store::auth::Principal;
@@ -84,21 +87,33 @@ pub async fn route_mkcalendar<C: CalendarStore, S: SubscriptionStore>(
    }

    let timezone_id = if let Some(tzid) = request.calendar_timezone_id {
+        if chrono_tz::Tz::from_str(&tzid).is_err() {
+            return Err(Error::PreconditionFailed(Precondition::CalendarTimezone(
+                "Invalid timezone ID in calendar-timezone-id",
+            )));
+        }
        Some(tzid)
    } else if let Some(tz) = request.calendar_timezone {
-        // TODO: Proper error (calendar-timezone precondition)
        let calendar = IcalParser::from_slice(tz.as_bytes())
            .next()
-            .ok_or_else(|| rustical_dav::Error::BadRequest("No timezone data provided".to_owned()))?
-            .map_err(|_| rustical_dav::Error::BadRequest("Error parsing timezone".to_owned()))?;
+            .ok_or(Error::PreconditionFailed(Precondition::CalendarTimezone(
+                "No timezone data provided",
+            )))?
+            .map_err(|_| {
+                Error::PreconditionFailed(Precondition::CalendarTimezone("Error parsing timezone"))
+            })?;

-        let timezone = calendar.vtimezones.values().next().ok_or_else(|| {
-            rustical_dav::Error::BadRequest("No timezone data provided".to_owned())
-        })?;
+        let timezone = calendar
+            .vtimezones
+            .values()
+            .next()
+            .ok_or(Error::PreconditionFailed(Precondition::CalendarTimezone(
+                "No timezone data provided",
+            )))?;
        let timezone: Option<chrono_tz::Tz> = timezone.into();
-        let timezone = timezone.ok_or_else(|| {
-            rustical_dav::Error::BadRequest("Cannot translate VTIMEZONE into IANA TZID".to_owned())
-        })?;
+        let timezone = timezone.ok_or(Error::PreconditionFailed(
+            Precondition::CalendarTimezone("No timezone data provided"),
+        ))?;

        Some(timezone.name().to_owned())
    } else {
--- a/crates/caldav/src/calendar/methods/report/calendar_query/comp_filter.rs
+++ b/crates/caldav/src/calendar/methods/report/calendar_query/comp_filter.rs
@@ -2,9 +2,12 @@ use crate::calendar::methods::report::calendar_query::{
    TimeRangeElement,
    prop_filter::{PropFilterElement, PropFilterable},
 };
-use ical::{
-    component::{CalendarInnerData, IcalAlarm, IcalCalendarObject, IcalEvent, IcalTodo},
-    parser::{Component, ical::component::IcalTimeZone},
+use caldata::{
+    component::{
+        CalendarInnerData, Component, IcalAlarm, IcalCalendarObject, IcalEvent, IcalTimeZone,
+        IcalTodo,
+    },
+    parser::ContentLine,
 };
 use rustical_xml::XmlDeserialize;

@@ -112,10 +115,7 @@ impl CompFilterable for CalendarInnerData {
 }

 impl PropFilterable for IcalAlarm {
-    fn get_named_properties<'a>(
-        &'a self,
-        name: &'a str,
-    ) -> impl Iterator<Item = &'a ical::property::ContentLine> {
+    fn get_named_properties<'a>(&'a self, name: &'a str) -> impl Iterator<Item = &'a ContentLine> {
        Component::get_named_properties(self, name)
    }
 }
@@ -139,7 +139,7 @@ impl PropFilterable for CalendarInnerData {
    fn get_named_properties<'a>(
        &'a self,
        name: &'a str,
-    ) -> Box<dyn Iterator<Item = &'a ical::property::ContentLine> + 'a> {
+    ) -> Box<dyn Iterator<Item = &'a ContentLine> + 'a> {
        // TODO: If we were pedantic, we would have to do recurrence expansion first
        // and take into account the overrides :(
        match self {
@@ -151,10 +151,7 @@ impl PropFilterable for CalendarInnerData {
 }

 impl PropFilterable for IcalCalendarObject {
-    fn get_named_properties<'a>(
-        &'a self,
-        name: &'a str,
-    ) -> impl Iterator<Item = &'a ical::property::ContentLine> {
+    fn get_named_properties<'a>(&'a self, name: &'a str) -> impl Iterator<Item = &'a ContentLine> {
        Component::get_named_properties(self, name)
    }
 }
@@ -185,10 +182,7 @@ impl CompFilterable for IcalCalendarObject {
 }

 impl PropFilterable for IcalTimeZone {
-    fn get_named_properties<'a>(
-        &'a self,
-        name: &'a str,
-    ) -> impl Iterator<Item = &'a ical::property::ContentLine> {
+    fn get_named_properties<'a>(&'a self, name: &'a str) -> impl Iterator<Item = &'a ContentLine> {
        Component::get_named_properties(self, name)
    }
 }
--- a/crates/caldav/src/calendar/methods/report/calendar_query/elements.rs
+++ b/crates/caldav/src/calendar/methods/report/calendar_query/elements.rs
@@ -1,6 +1,6 @@
 use super::comp_filter::{CompFilterElement, CompFilterable};
 use crate::calendar_object::CalendarObjectPropWrapperName;
-use ical::{component::IcalCalendarObject, property::ContentLine};
+use caldata::{component::IcalCalendarObject, parser::ContentLine};
 use rustical_dav::xml::{PropfindType, TextMatchElement};
 use rustical_ical::UtcDateTime;
 use rustical_store::calendar_store::CalendarQuery;
--- a/crates/caldav/src/calendar/methods/report/calendar_query/prop_filter.rs
+++ b/crates/caldav/src/calendar/methods/report/calendar_query/prop_filter.rs
@@ -1,5 +1,5 @@
 use super::{ParamFilterElement, TimeRangeElement};
-use ical::{property::ContentLine, types::CalDateTime};
+use caldata::{parser::ContentLine, types::CalDateTime};
 use rustical_dav::xml::TextMatchElement;
 use rustical_ical::UtcDateTime;
 use rustical_xml::XmlDeserialize;
--- a/crates/caldav/src/calendar/resource.rs
+++ b/crates/caldav/src/calendar/resource.rs
@@ -1,10 +1,10 @@
 use super::prop::{SupportedCalendarComponentSet, SupportedCalendarData};
 use crate::Error;
 use crate::calendar::prop::{ReportMethod, SupportedCollationSet};
+use caldata::IcalParser;
+use caldata::types::CalDateTime;
 use chrono::{DateTime, Utc};
 use derive_more::derive::{From, Into};
-use ical::IcalParser;
-use ical::types::CalDateTime;
 use rustical_dav::extensions::{
    CommonPropertiesExtension, CommonPropertiesProp, SyncTokenExtension, SyncTokenExtensionProp,
 };
--- a/crates/caldav/src/calendar/service.rs
+++ b/crates/caldav/src/calendar/service.rs
@@ -6,7 +6,7 @@ use crate::calendar::methods::report::route_report_calendar;
 use crate::calendar::resource::CalendarResource;
 use crate::calendar_object::CalendarObjectResourceService;
 use crate::calendar_object::resource::CalendarObjectResource;
-use crate::{CalDavPrincipalUri, Error};
+use crate::{CalDavConfig, CalDavPrincipalUri, Error};
 use async_trait::async_trait;
 use axum::Router;
 use axum::extract::Request;
@@ -23,6 +23,7 @@ use tower::Service;
 pub struct CalendarResourceService<C: CalendarStore, S: SubscriptionStore> {
    pub(crate) cal_store: Arc<C>,
    pub(crate) sub_store: Arc<S>,
+    pub(crate) config: Arc<CalDavConfig>,
 }

 impl<C: CalendarStore, S: SubscriptionStore> Clone for CalendarResourceService<C, S> {
@@ -30,15 +31,17 @@ impl<C: CalendarStore, S: SubscriptionStore> Clone for CalendarResourceService<C
        Self {
            cal_store: self.cal_store.clone(),
            sub_store: self.sub_store.clone(),
+            config: self.config.clone(),
        }
    }
 }

 impl<C: CalendarStore, S: SubscriptionStore> CalendarResourceService<C, S> {
-    pub const fn new(cal_store: Arc<C>, sub_store: Arc<S>) -> Self {
+    pub const fn new(cal_store: Arc<C>, sub_store: Arc<S>, config: Arc<CalDavConfig>) -> Self {
        Self {
            cal_store,
            sub_store,
+            config,
        }
    }
 }
@@ -112,7 +115,8 @@ impl<C: CalendarStore, S: SubscriptionStore> ResourceService for CalendarResourc
        Router::new()
            .nest(
                "/{object_id}",
-                CalendarObjectResourceService::new(self.cal_store.clone()).axum_router(),
+                CalendarObjectResourceService::new(self.cal_store.clone(), self.config.clone())
+                    .axum_router(),
            )
            .route_service("/", self.axum_service())
    }
--- a/crates/caldav/src/calendar/snapshots/rustical_caldavcalendartests__propfind-2.snap
+++ b/crates/caldav/src/calendar/snapshots/rustical_caldavcalendartests__propfind-2.snap
@@ -12,7 +12,7 @@ PRODID:-//github.com/lennart-k/vzic-rs//RustiCal Calendar server//EN
 VERSION:2.0
 BEGIN:VTIMEZONE
 TZID:Europe/Berlin
-LAST-MODIFIED:20250723T190331Z
+LAST-MODIFIED:20260124T185655Z
 X-LIC-LOCATION:Europe/Berlin
 X-PROLEPTIC-TZNAME:LMT
 BEGIN:STANDARD
--- a/crates/caldav/src/calendar_object/methods.rs
+++ b/crates/caldav/src/calendar_object/methods.rs
@@ -5,13 +5,14 @@ use axum::body::Body;
 use axum::extract::{Path, State};
 use axum::response::{IntoResponse, Response};
 use axum_extra::TypedHeader;
+use caldata::parser::ParserOptions;
 use headers::{ContentType, ETag, HeaderMapExt, IfNoneMatch};
 use http::{HeaderMap, HeaderValue, Method, StatusCode};
 use rustical_ical::CalendarObject;
 use rustical_store::CalendarStore;
 use rustical_store::auth::Principal;
 use std::str::FromStr;
-use tracing::{debug, instrument};
+use tracing::{instrument, warn};

 #[instrument(skip(cal_store))]
 pub async fn get_event<C: CalendarStore>(
@@ -20,7 +21,10 @@ pub async fn get_event<C: CalendarStore>(
        calendar_id,
        object_id,
    }): Path<CalendarObjectPathComponents>,
-    State(CalendarObjectResourceService { cal_store }): State<CalendarObjectResourceService<C>>,
+    State(CalendarObjectResourceService {
+        cal_store,
+        config: _,
+    }): State<CalendarObjectResourceService<C>>,
    user: Principal,
    method: Method,
 ) -> Result<Response, Error> {
@@ -57,7 +61,9 @@ pub async fn put_event<C: CalendarStore>(
        calendar_id,
        object_id,
    }): Path<CalendarObjectPathComponents>,
-    State(CalendarObjectResourceService { cal_store }): State<CalendarObjectResourceService<C>>,
+    State(CalendarObjectResourceService { cal_store, config }): State<
+        CalendarObjectResourceService<C>,
+    >,
    user: Principal,
    mut if_none_match: Option<TypedHeader<IfNoneMatch>>,
    header_map: HeaderMap,
@@ -94,9 +100,18 @@ pub async fn put_event<C: CalendarStore>(
        true
    };

-    let Ok(object) = CalendarObject::from_ics(body.clone()) else {
-        debug!("invalid calendar data:\n{body}");
-        return Err(Error::PreconditionFailed(Precondition::ValidCalendarData));
+    let object = match CalendarObject::import(
+        &body,
+        Some(ParserOptions {
+            rfc7809: config.rfc7809,
+        }),
+    ) {
+        Ok(object) => object,
+        Err(err) => {
+            warn!("invalid calendar data:\n{body}");
+            warn!("{err}");
+            return Err(Error::PreconditionFailed(Precondition::ValidCalendarData));
+        }
    };
    let etag = object.get_etag();
    cal_store
--- a/crates/caldav/src/calendar_object/resource.rs
+++ b/crates/caldav/src/calendar_object/resource.rs
@@ -3,8 +3,8 @@ use super::prop::{
    CalendarObjectPropWrapperName,
 };
 use crate::Error;
+use caldata::generator::Emitter;
 use derive_more::derive::{From, Into};
-use ical::generator::Emitter;
 use rustical_dav::{
    extensions::CommonPropertiesExtension,
    privileges::UserPrivilegeSet,
--- a/crates/caldav/src/calendar_object/service.rs
+++ b/crates/caldav/src/calendar_object/service.rs
@@ -1,5 +1,5 @@
 use crate::{
-    CalDavPrincipalUri, Error,
+    CalDavConfig, CalDavPrincipalUri, Error,
    calendar_object::{
        methods::{get_event, put_event},
        resource::CalendarObjectResource,
@@ -24,19 +24,21 @@ pub struct CalendarObjectPathComponents {

 pub struct CalendarObjectResourceService<C: CalendarStore> {
    pub(crate) cal_store: Arc<C>,
+    pub(crate) config: Arc<CalDavConfig>,
 }

 impl<C: CalendarStore> Clone for CalendarObjectResourceService<C> {
    fn clone(&self) -> Self {
        Self {
            cal_store: self.cal_store.clone(),
+            config: self.config.clone(),
        }
    }
 }

 impl<C: CalendarStore> CalendarObjectResourceService<C> {
-    pub const fn new(cal_store: Arc<C>) -> Self {
-        Self { cal_store }
+    pub const fn new(cal_store: Arc<C>, config: Arc<CalDavConfig>) -> Self {
+        Self { cal_store, config }
    }
 }

--- a/crates/caldav/src/error.rs
+++ b/crates/caldav/src/error.rs
@@ -12,6 +12,9 @@ pub enum Precondition {
    #[error("valid-calendar-data")]
    #[xml(ns = "rustical_dav::namespace::NS_CALDAV")]
    ValidCalendarData,
+    #[error("calendar-timezone")]
+    #[xml(ns = "rustical_dav::namespace::NS_CALDAV")]
+    CalendarTimezone(&'static str),
 }

 impl IntoResponse for Precondition {
@@ -23,7 +26,7 @@ impl IntoResponse for Precondition {
        if let Err(err) = error.serialize_root(&mut writer) {
            return rustical_dav::Error::from(err).into_response();
        }
-        let mut res = Response::builder().status(StatusCode::PRECONDITION_FAILED);
+        let mut res = Response::builder().status(StatusCode::FORBIDDEN);
        res.headers_mut().unwrap().typed_insert(ContentType::xml());
        res.body(Body::from(output)).unwrap()
    }
@@ -72,17 +75,20 @@ impl Error {
            Self::XmlDecodeError(_) => StatusCode::BAD_REQUEST,
            Self::ChronoParseError(_) | Self::NotImplemented => StatusCode::INTERNAL_SERVER_ERROR,
            Self::NotFound => StatusCode::NOT_FOUND,
-            Self::PreconditionFailed(_err) => StatusCode::PRECONDITION_FAILED,
+            // The correct status code for a failed precondition is not PreconditionFailed but
+            // Forbidden (or Conflict):
+            // https://datatracker.ietf.org/doc/html/rfc4791#section-1.3
+            Self::PreconditionFailed(_err) => StatusCode::FORBIDDEN,
        }
    }
 }

 impl IntoResponse for Error {
    fn into_response(self) -> axum::response::Response {
-        if matches!(
-            self.status_code(),
-            StatusCode::INTERNAL_SERVER_ERROR | StatusCode::PRECONDITION_FAILED
-        ) {
+        if let Self::PreconditionFailed(precondition) = self {
+            return precondition.into_response();
+        }
+        if matches!(self.status_code(), StatusCode::INTERNAL_SERVER_ERROR) {
            error!("{self}");
        }
        (self.status_code(), self.to_string()).into_response()
--- a/crates/caldav/src/lib.rs
+++ b/crates/caldav/src/lib.rs
@@ -8,6 +8,7 @@ use rustical_dav::resources::RootResourceService;
 use rustical_store::auth::middleware::AuthenticationLayer;
 use rustical_store::auth::{AuthenticationProvider, Principal};
 use rustical_store::{CalendarStore, SubscriptionStore};
+use serde::{Deserialize, Serialize};
 use std::sync::Arc;

 pub mod calendar;
@@ -34,6 +35,7 @@ pub fn caldav_router<AP: AuthenticationProvider, C: CalendarStore, S: Subscripti
    store: Arc<C>,
    subscription_store: Arc<S>,
    simplified_home_set: bool,
+    config: Arc<CalDavConfig>,
 ) -> Router {
    Router::new().nest(
        prefix,
@@ -42,9 +44,27 @@ pub fn caldav_router<AP: AuthenticationProvider, C: CalendarStore, S: Subscripti
            sub_store: subscription_store,
            cal_store: store,
            simplified_home_set,
+            config,
        })
        .axum_router()
        .layer(AuthenticationLayer::new(auth_provider))
        .layer(Extension(CalDavPrincipalUri(prefix))),
    )
 }
+
+const fn default_true() -> bool {
+    true
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[serde(deny_unknown_fields, default)]
+pub struct CalDavConfig {
+    #[serde(default = "default_true")]
+    rfc7809: bool,
+}
+
+impl Default for CalDavConfig {
+    fn default() -> Self {
+        Self { rfc7809: true }
+    }
+}
--- a/crates/caldav/src/principal/service.rs
+++ b/crates/caldav/src/principal/service.rs
@@ -1,7 +1,7 @@
 use crate::calendar::CalendarResourceService;
 use crate::calendar::resource::CalendarResource;
 use crate::principal::PrincipalResource;
-use crate::{CalDavPrincipalUri, Error};
+use crate::{CalDavConfig, CalDavPrincipalUri, Error};
 use async_trait::async_trait;
 use axum::Router;
 use rustical_dav::resource::{AxumMethods, ResourceService};
@@ -20,6 +20,7 @@ pub struct PrincipalResourceService<
    pub(crate) cal_store: Arc<CS>,
    // If true only return the principal as the calendar home set, otherwise also groups
    pub(crate) simplified_home_set: bool,
+    pub(crate) config: Arc<CalDavConfig>,
 }

 impl<AP: AuthenticationProvider, S: SubscriptionStore, CS: CalendarStore> Clone
@@ -31,6 +32,7 @@ impl<AP: AuthenticationProvider, S: SubscriptionStore, CS: CalendarStore> Clone
            sub_store: self.sub_store.clone(),
            cal_store: self.cal_store.clone(),
            simplified_home_set: self.simplified_home_set,
+            config: self.config.clone(),
        }
    }
 }
@@ -84,8 +86,12 @@ impl<AP: AuthenticationProvider, S: SubscriptionStore, CS: CalendarStore> Resour
        Router::new()
            .nest(
                "/{calendar_id}",
-                CalendarResourceService::new(self.cal_store.clone(), self.sub_store.clone())
-                    .axum_router(),
+                CalendarResourceService::new(
+                    self.cal_store.clone(),
+                    self.sub_store.clone(),
+                    self.config.clone(),
+                )
+                .axum_router(),
            )
            .route_service("/", self.axum_service())
    }
--- a/crates/caldav/src/principal/tests.rs
+++ b/crates/caldav/src/principal/tests.rs
@@ -27,6 +27,7 @@ async fn test_principal_resource(
        sub_store: Arc::new(sub_store),
        auth_provider: Arc::new(auth_provider),
        simplified_home_set: false,
+        config: Default::default(),
    };

    // We don't have any calendars here
--- a/crates/carddav/Cargo.toml
+++ b/crates/carddav/Cargo.toml
@@ -32,7 +32,7 @@ rustical_ical.workspace = true
 http.workspace = true
 tower-http.workspace = true
 percent-encoding.workspace = true
-ical.workspace = true
+caldata.workspace = true
 strum.workspace = true
 strum_macros.workspace = true
 rstest.workspace = true
--- a/crates/carddav/src/address_object/resource.rs
+++ b/crates/carddav/src/address_object/resource.rs
@@ -7,8 +7,8 @@ use crate::{
        AddressObjectPropWrapperName,
    },
 };
+use caldata::property::VcardFNProperty;
 use derive_more::derive::{From, Into};
-use ical::parser::VcardFNProperty;
 use rustical_dav::{
    extensions::CommonPropertiesExtension,
    privileges::UserPrivilegeSet,
--- a/crates/carddav/src/addressbook/methods/import.rs
+++ b/crates/carddav/src/addressbook/methods/import.rs
@@ -4,11 +4,12 @@ use axum::{
    extract::{Path, State},
    response::{IntoResponse, Response},
 };
-use http::StatusCode;
-use ical::{
-    parser::{Component, ComponentMut, vcard},
-    property::ContentLine,
+use caldata::{
+    VcardParser,
+    component::{Component, ComponentMut},
+    parser::{ContentLine, ParserOptions},
 };
+use http::StatusCode;
 use rustical_store::{Addressbook, AddressbookStore, SubscriptionStore, auth::Principal};
 use tracing::instrument;

@@ -23,7 +24,7 @@ pub async fn route_import<AS: AddressbookStore, S: SubscriptionStore>(
        return Err(Error::Unauthorized);
    }

-    let parser = vcard::VcardParser::from_slice(body.as_bytes());
+    let parser = VcardParser::from_slice(body.as_bytes());

    let mut objects = vec![];
    for res in parser {
@@ -36,7 +37,7 @@ pub async fn route_import<AS: AddressbookStore, S: SubscriptionStore>(
                value: Some(uuid::Uuid::new_v4().to_string()),
                params: vec![].into(),
            });
-            card = card_mut.build(None).unwrap();
+            card = card_mut.build(&ParserOptions::default(), None).unwrap();
        }
        // TODO: Make nicer
        let uid = card.get_uid().unwrap();
--- a/crates/carddav/src/addressbook/methods/report/addressbook_query/elements.rs
+++ b/crates/carddav/src/addressbook/methods/report/addressbook_query/elements.rs
@@ -2,8 +2,8 @@ use crate::{
    address_object::AddressObjectPropWrapperName,
    addressbook::methods::report::addressbook_query::PropFilterElement,
 };
+use caldata::parser::ContentLine;
 use derive_more::{From, Into};
-use ical::property::ContentLine;
 use rustical_dav::xml::{PropfindType, TextMatchElement};
 use rustical_ical::{AddressObject, UtcDateTime};
 use rustical_xml::{ValueDeserialize, XmlDeserialize, XmlRootTag};
--- a/crates/carddav/src/addressbook/methods/report/addressbook_query/prop_filter.rs
+++ b/crates/carddav/src/addressbook/methods/report/addressbook_query/prop_filter.rs
@@ -1,5 +1,5 @@
 use super::{Allof, ParamFilterElement};
-use ical::{parser::Component, property::ContentLine};
+use caldata::{component::Component, parser::ContentLine};
 use rustical_dav::xml::TextMatchElement;
 use rustical_ical::AddressObject;
 use rustical_xml::XmlDeserialize;
--- a/crates/dav/Cargo.toml
+++ b/crates/dav/Cargo.toml
@@ -28,7 +28,7 @@ headers.workspace = true
 strum.workspace = true
 matchit.workspace = true
 matchit-serde.workspace = true
-ical = { workspace = true, optional = true }
+caldata = { workspace = true, optional = true }

 [features]
-ical = ["dep:ical"]
+ical = ["dep:caldata"]
--- a/crates/dav/src/error.rs
+++ b/crates/dav/src/error.rs
@@ -51,19 +51,18 @@ impl Error {
                _ => StatusCode::BAD_REQUEST,
            },
            Self::PropReadOnly => StatusCode::CONFLICT,
-            Self::PreconditionFailed => StatusCode::PRECONDITION_FAILED,
            Self::InternalError | Self::IOError(_) => StatusCode::INTERNAL_SERVER_ERROR,
-            Self::Forbidden => StatusCode::FORBIDDEN,
+            // The correct status code for a failed precondition is not PreconditionFailed but
+            // Forbidden (or Conflict):
+            // https://datatracker.ietf.org/doc/html/rfc4791#section-1.3
+            Self::PreconditionFailed | Self::Forbidden => StatusCode::FORBIDDEN,
        }
    }
 }

 impl axum::response::IntoResponse for Error {
    fn into_response(self) -> axum::response::Response {
-        if matches!(
-            self.status_code(),
-            StatusCode::INTERNAL_SERVER_ERROR | StatusCode::PRECONDITION_FAILED
-        ) {
+        if matches!(self.status_code(), StatusCode::INTERNAL_SERVER_ERROR) {
            error!("{self}");
        }

--- a/crates/dav/src/resource/methods/proppatch.rs
+++ b/crates/dav/src/resource/methods/proppatch.rs
@@ -71,6 +71,7 @@ pub async fn axum_route_proppatch<R: ResourceService>(
    route_proppatch(&path, uri.path(), &body, &principal, &resource_service).await
 }

+#[allow(clippy::too_many_lines)]
 pub async fn route_proppatch<R: ResourceService>(
    path_components: &R::PathComponents,
    path: &str,
@@ -116,12 +117,14 @@ pub async fn route_proppatch<R: ResourceService>(
                            }
                        }
                        SetPropertyPropWrapper::Invalid(invalid) => {
-                            let propname = invalid.tag_name();
+                            let Unparsed(propns, propname) = invalid;

                            if let Some(full_propname) = <R::Resource as Resource>::list_props()
                                .into_iter()
                                .find_map(|(ns, tag)| {
-                                    if tag == propname.as_str() {
+                                    if (ns, tag)
+                                        == (propns.as_ref().map(NamespaceOwned::as_ref), &propname)
+                                    {
                                        Some((ns.map(NamespaceOwned::from), tag.to_owned()))
                                    } else {
                                        None
@@ -133,7 +136,7 @@ pub async fn route_proppatch<R: ResourceService>(
                                // - internal properties
                                props_conflict.push(full_propname);
                            } else {
-                                props_not_found.push((None, propname));
+                                props_not_found.push((propns, propname));
                            }
                        }
                    }
--- a/crates/dav/src/xml/text_match.rs
+++ b/crates/dav/src/xml/text_match.rs
@@ -1,4 +1,4 @@
-use ical::property::ContentLine;
+use caldata::parser::ContentLine;
 use rustical_xml::{ValueDeserialize, XmlDeserialize};
 use std::borrow::Cow;

--- a/crates/ical/Cargo.toml
+++ b/crates/ical/Cargo.toml
@@ -15,7 +15,7 @@ chrono-tz.workspace = true
 thiserror.workspace = true
 derive_more.workspace = true
 rustical_xml.workspace = true
-ical.workspace = true
+caldata.workspace = true
 regex.workspace = true
 rrule.workspace = true
 serde.workspace = true
--- a/crates/ical/src/address_object.rs
+++ b/crates/ical/src/address_object.rs
@@ -1,20 +1,23 @@
 use crate::{CalendarObject, Error};
+use caldata::{
+    VcardParser,
+    component::{
+        CalendarInnerDataBuilder, ComponentMut, IcalAlarmBuilder, IcalCalendarObjectBuilder,
+        IcalEventBuilder, VcardContact,
+    },
+    generator::Emitter,
+    parser::{ContentLine, ParserOptions},
+    property::{
+        Calscale, IcalCALSCALEProperty, IcalDTENDProperty, IcalDTSTAMPProperty,
+        IcalDTSTARTProperty, IcalPRODIDProperty, IcalRRULEProperty, IcalSUMMARYProperty,
+        IcalUIDProperty, IcalVERSIONProperty, IcalVersion, VcardANNIVERSARYProperty,
+        VcardBDAYProperty, VcardFNProperty,
+    },
+    types::{CalDate, PartialDate, Timezone},
+};
 use chrono::{NaiveDate, Utc};
-use ical::component::{
-    CalendarInnerDataBuilder, IcalAlarmBuilder, IcalCalendarObjectBuilder, IcalEventBuilder,
-};
-use ical::generator::Emitter;
-use ical::parser::vcard::{self, component::VcardContact};
-use ical::parser::{
-    Calscale, ComponentMut, IcalCALSCALEProperty, IcalDTENDProperty, IcalDTSTAMPProperty,
-    IcalDTSTARTProperty, IcalPRODIDProperty, IcalRRULEProperty, IcalSUMMARYProperty,
-    IcalUIDProperty, IcalVERSIONProperty, IcalVersion, VcardANNIVERSARYProperty, VcardBDAYProperty,
-    VcardFNProperty,
-};
-use ical::property::ContentLine;
-use ical::types::{CalDate, PartialDate};
 use sha2::{Digest, Sha256};
-use std::collections::HashMap;
+use std::collections::BTreeMap;
 use std::str::FromStr;

 #[derive(Debug, Clone)]
@@ -32,7 +35,7 @@ impl From<VcardContact> for AddressObject {

 impl AddressObject {
    pub fn from_vcf(vcf: String) -> Result<Self, Error> {
-        let parser = vcard::VcardParser::from_slice(vcf.as_bytes());
+        let parser = VcardParser::from_slice(vcf.as_bytes());
        let vcard = parser.expect_one()?;
        Ok(Self { vcf, vcard })
    }
@@ -70,7 +73,7 @@ impl AddressObject {
        let Some(dtstart) = NaiveDate::from_ymd_opt(year.unwrap_or(1900), month, day) else {
            return Ok(None);
        };
-        let start_date = CalDate(dtstart, ical::types::Timezone::Local);
+        let start_date = CalDate(dtstart, Timezone::Local);
        let Some(end_date) = start_date.succ_opt() else {
            // start_date is MAX_DATE, this should never happen but FAPP also not raise an error
            return Ok(None);
@@ -131,9 +134,9 @@ impl AddressObject {
                    .into(),
                ],
                inner: Some(CalendarInnerDataBuilder::Event(vec![event])),
-                vtimezones: HashMap::default(),
+                vtimezones: BTreeMap::default(),
            }
-            .build(None)?
+            .build(&ParserOptions::default(), None)?
            .into(),
        ))
    }
--- a/crates/ical/src/calendar_object.rs
+++ b/crates/ical/src/calendar_object.rs
@@ -1,9 +1,13 @@
+use std::sync::OnceLock;
+
 use crate::Error;
+use caldata::{
+    IcalObjectParser,
+    component::{CalendarInnerData, IcalCalendarObject},
+    generator::Emitter,
+    parser::ParserOptions,
+};
 use derive_more::Display;
-use ical::IcalObjectParser;
-use ical::component::CalendarInnerData;
-use ical::component::IcalCalendarObject;
-use ical::generator::Emitter;
 use serde::Deserialize;
 use serde::Serialize;
 use sha2::{Digest, Sha256};
@@ -64,15 +68,35 @@ impl rustical_xml::ValueDeserialize for CalendarObjectType {
 #[derive(Debug, Clone)]
 pub struct CalendarObject {
    inner: IcalCalendarObject,
-    ics: String,
+    ics: OnceLock<String>,
 }

 impl CalendarObject {
+    // This function parses iCalendar data but doesn't cache it
+    // This is meant for iCalendar data coming from outside that might need to be normalised.
+    // For example if timezones are omitted this can be fixed by this function.
+    pub fn import(ics: &str, options: Option<ParserOptions>) -> Result<Self, Error> {
+        let parser =
+            IcalObjectParser::from_slice(ics.as_bytes()).with_options(options.unwrap_or_default());
+        let inner = parser.expect_one()?;
+
+        Ok(Self {
+            inner,
+            ics: OnceLock::new(),
+        })
+    }
+
+    // This function parses iCalendar data and then caches the parsed iCalendar data.
+    // This function is only meant for loading data from a data store where we know the iCalendar
+    // is already in the desired form.
    pub fn from_ics(ics: String) -> Result<Self, Error> {
        let parser = IcalObjectParser::from_slice(ics.as_bytes());
        let inner = parser.expect_one()?;

-        Ok(Self { inner, ics })
+        Ok(Self {
+            inner,
+            ics: ics.into(),
+        })
    }

    #[must_use]
@@ -95,7 +119,7 @@ impl CalendarObject {

    #[must_use]
    pub fn get_ics(&self) -> &str {
-        &self.ics
+        self.ics.get_or_init(|| self.inner.generate())
    }

    #[must_use]
@@ -113,7 +137,7 @@ impl From<CalendarObject> for IcalCalendarObject {
 impl From<IcalCalendarObject> for CalendarObject {
    fn from(value: IcalCalendarObject) -> Self {
        Self {
-            ics: value.generate(),
+            ics: value.generate().into(),
            inner: value,
        }
    }
--- a/crates/ical/src/lib.rs
+++ b/crates/ical/src/lib.rs
@@ -1,7 +1,7 @@
 #![warn(clippy::all, clippy::pedantic, clippy::nursery)]
 #![allow(clippy::missing_errors_doc, clippy::missing_panics_doc)]
 mod timestamp;
-use ical::parser::ParserError;
+use caldata::parser::ParserError;
 pub use timestamp::*;

 mod calendar_object;
--- a/crates/store/Cargo.toml
+++ b/crates/store/Cargo.toml
@@ -13,7 +13,7 @@ anyhow.workspace = true
 async-trait.workspace = true
 serde.workspace = true
 sha2.workspace = true
-ical.workspace = true
+caldata.workspace = true
 chrono.workspace = true
 regex.workspace = true
 thiserror.workspace = true
--- a/crates/store/src/error.rs
+++ b/crates/store/src/error.rs
@@ -26,7 +26,7 @@ pub enum Error {
    Other(#[from] anyhow::Error),

    #[error(transparent)]
-    IcalError(#[from] ical::parser::ParserError),
+    IcalError(#[from] caldata::parser::ParserError),
 }

 impl Error {
@@ -36,7 +36,6 @@ impl Error {
            Self::NotFound => StatusCode::NOT_FOUND,
            Self::AlreadyExists => StatusCode::CONFLICT,
            Self::ReadOnly => StatusCode::FORBIDDEN,
-            // TODO: Can also be Bad Request, depending on when this is raised
            Self::IcalError(_err) => StatusCode::INTERNAL_SERVER_ERROR,
            Self::InvalidPrincipalType(_) => StatusCode::BAD_REQUEST,
            _ => StatusCode::INTERNAL_SERVER_ERROR,
@@ -53,9 +52,7 @@ impl IntoResponse for Error {
    fn into_response(self) -> axum::response::Response {
        if matches!(
            self.status_code(),
-            StatusCode::INTERNAL_SERVER_ERROR
-                | StatusCode::PRECONDITION_FAILED
-                | StatusCode::CONFLICT
+            StatusCode::INTERNAL_SERVER_ERROR | StatusCode::CONFLICT
        ) {
            error!("{self}");
        }
--- a/crates/store_sqlite/Cargo.toml
+++ b/crates/store_sqlite/Cargo.toml
@@ -20,7 +20,7 @@ rstest.workspace = true
 criterion.workspace = true

 [dependencies]
-ical.workspace = true
+caldata.workspace = true
 tokio.workspace = true
 rustical_store.workspace = true
 async-trait.workspace = true
--- a/crates/store_sqlite/src/addressbook_store/birthday_calendar.rs
+++ b/crates/store_sqlite/src/addressbook_store/birthday_calendar.rs
@@ -338,7 +338,7 @@ impl CalendarStore for SqliteAddressbookStore {
                out_objects.push((format!("{object_id}-birthday"), birthday));
            }
            if let Some(anniversary) = object.get_anniversary_object()? {
-                out_objects.push((format!("{object_id}-anniversayr"), anniversary));
+                out_objects.push((format!("{object_id}-anniversary"), anniversary));
            }
        }

@@ -382,7 +382,7 @@ impl CalendarStore for SqliteAddressbookStore {
                objects.push((format!("{object_id}-birthday"), birthday));
            }
            if let Some(anniversary) = object.get_anniversary_object()? {
-                objects.push((format!("{object_id}-anniversayr"), anniversary));
+                objects.push((format!("{object_id}-anniversary"), anniversary));
            }
        }
        Ok(objects)
--- a/crates/store_sqlite/src/addressbook_store/mod.rs
+++ b/crates/store_sqlite/src/addressbook_store/mod.rs
@@ -1,6 +1,7 @@
 use super::ChangeOperation;
 use crate::BEGIN_IMMEDIATE;
 use async_trait::async_trait;
+use caldata::parser::ParserError;
 use derive_more::derive::Constructor;
 use rustical_ical::AddressObject;
 use rustical_store::{
@@ -9,7 +10,7 @@ use rustical_store::{
 };
 use sqlx::{Acquire, Executor, Sqlite, SqlitePool, Transaction};
 use tokio::sync::mpsc::Sender;
-use tracing::{error_span, instrument, warn};
+use tracing::{error, error_span, instrument, warn};

 pub mod birthday_calendar;

@@ -18,6 +19,12 @@ struct AddressObjectRow {
    id: String,
    vcf: String,
 }
+impl From<AddressObjectRow> for (String, Result<AddressObject, ParserError>) {
+    fn from(row: AddressObjectRow) -> Self {
+        let result = AddressObject::from_vcf(row.vcf);
+        (row.id, result)
+    }
+}

 impl TryFrom<AddressObjectRow> for (String, AddressObject) {
    type Error = rustical_store::Error;
@@ -31,6 +38,7 @@ impl TryFrom<AddressObjectRow> for (String, AddressObject) {
 pub struct SqliteAddressbookStore {
    db: SqlitePool,
    sender: Sender<CollectionOperation>,
+    skip_broken: bool,
 }

 impl SqliteAddressbookStore {
@@ -88,6 +96,36 @@ impl SqliteAddressbookStore {
        Ok(())
    }

+    #[allow(clippy::missing_panics_doc)]
+    pub async fn validate_objects(&self, principal: &str) -> Result<(), Error> {
+        let mut success = true;
+        for addressbook in self.get_addressbooks(principal).await? {
+            for (object_id, res) in Self::_get_objects(&self.db, principal, &addressbook.id).await?
+            {
+                if let Err(err) = res {
+                    warn!(
+                        "Invalid address object found at {principal}/{addr_id}/{object_id}.vcf. Error: {err}",
+                        addr_id = addressbook.id
+                    );
+                    success = false;
+                }
+            }
+        }
+        if !success {
+            if self.skip_broken {
+                error!(
+                    "Not all address objects are valid. Since data_store.sqlite.skip_broken=true they will be hidden. You are still advised to manually remove or repair the object. If you need help feel free to open up an issue on GitHub."
+                );
+            } else {
+                error!(
+                    "Not all address objects are valid. Since data_store.sqlite.skip_broken=false this causes a panic. Remove or repair the broken objects manually or set data_store.sqlite.skip_broken=false as a temporary solution to ignore the error. If you need help feel free to open up an issue on GitHub."
+                );
+                panic!();
+            }
+        }
+        Ok(())
+    }
+
    // Logs an operation to an address object
    async fn log_object_operation(
        tx: &mut Transaction<'_, Sqlite>,
@@ -134,7 +172,7 @@ impl SqliteAddressbookStore {
        if let Err(err) = self.sender.try_send(CollectionOperation { topic, data }) {
            error_span!(
                "Error trying to send addressbook update notification:",
-                err = format!("{err:?}"),
+                err = format!("{err}"),
            );
        }
    }
@@ -353,8 +391,8 @@ impl SqliteAddressbookStore {
        executor: E,
        principal: &str,
        addressbook_id: &str,
-    ) -> Result<Vec<(String, AddressObject)>, rustical_store::Error> {
-        sqlx::query_as!(
+    ) -> Result<impl Iterator<Item = (String, Result<AddressObject, ParserError>)>, Error> {
+        Ok(sqlx::query_as!(
            AddressObjectRow,
            "SELECT id, vcf FROM addressobjects WHERE principal = ? AND addressbook_id = ? AND deleted_at IS NULL",
            principal,
@@ -363,8 +401,8 @@ impl SqliteAddressbookStore {
        .fetch_all(executor)
        .await.map_err(crate::Error::from)?
        .into_iter()
-        .map(std::convert::TryInto::try_into)
-        .collect()
+        .map(Into::into)
+        )
    }

    async fn _get_object<'e, E: Executor<'e, Database = Sqlite>>(
@@ -607,7 +645,16 @@ impl AddressbookStore for SqliteAddressbookStore {
        principal: &str,
        addressbook_id: &str,
    ) -> Result<Vec<(String, AddressObject)>, rustical_store::Error> {
-        Self::_get_objects(&self.db, principal, addressbook_id).await
+        let objects = Self::_get_objects(&self.db, principal, addressbook_id).await?;
+        if self.skip_broken {
+            Ok(objects
+                .filter_map(|(id, res)| Some((id, res.ok()?)))
+                .collect())
+        } else {
+            Ok(objects
+                .map(|(id, res)| res.map(|obj| (id, obj)))
+                .collect::<Result<Vec<_>, _>>()?)
+        }
    }

    #[instrument]
--- a/crates/store_sqlite/src/calendar_store.rs
+++ b/crates/store_sqlite/src/calendar_store.rs
@@ -1,9 +1,10 @@
 use super::ChangeOperation;
 use crate::BEGIN_IMMEDIATE;
 use async_trait::async_trait;
+use caldata::parser::ParserError;
+use caldata::types::CalDateTime;
 use chrono::TimeDelta;
 use derive_more::derive::Constructor;
-use ical::types::CalDateTime;
 use regex::Regex;
 use rustical_ical::{CalendarObject, CalendarObjectType};
 use rustical_store::calendar_store::CalendarQuery;
@@ -13,7 +14,7 @@ use rustical_store::{CollectionOperation, CollectionOperationInfo};
 use sqlx::types::chrono::NaiveDateTime;
 use sqlx::{Acquire, Executor, Sqlite, SqlitePool, Transaction};
 use tokio::sync::mpsc::Sender;
-use tracing::{error_span, instrument, warn};
+use tracing::{error, error_span, instrument, warn};

 #[derive(Debug, Clone)]
 struct CalendarObjectRow {
@@ -22,6 +23,23 @@ struct CalendarObjectRow {
    uid: String,
 }

+impl From<CalendarObjectRow> for (String, Result<CalendarObject, ParserError>) {
+    fn from(row: CalendarObjectRow) -> Self {
+        let result = CalendarObject::from_ics(row.ics).inspect(|object| {
+            if object.get_uid() != row.uid {
+                warn!(
+                    "Calendar object {}.ics: UID={} and row uid={} do not match",
+                    row.id,
+                    object.get_uid(),
+                    row.uid
+                );
+            }
+        });
+
+        (row.id, result)
+    }
+}
+
 impl TryFrom<CalendarObjectRow> for (String, CalendarObject) {
    type Error = rustical_store::Error;

@@ -92,6 +110,7 @@ impl From<CalendarRow> for Calendar {
 pub struct SqliteCalendarStore {
    db: SqlitePool,
    sender: Sender<CollectionOperation>,
+    skip_broken: bool,
 }

 impl SqliteCalendarStore {
@@ -141,11 +160,40 @@ impl SqliteCalendarStore {
        if let Err(err) = self.sender.try_send(CollectionOperation { topic, data }) {
            error_span!(
                "Error trying to send calendar update notification:",
-                err = format!("{err:?}"),
+                err = format!("{err}"),
            );
        }
    }

+    #[allow(clippy::missing_panics_doc)]
+    pub async fn validate_objects(&self, principal: &str) -> Result<(), Error> {
+        let mut success = true;
+        for calendar in self.get_calendars(principal).await? {
+            for (object_id, res) in Self::_get_objects(&self.db, principal, &calendar.id).await? {
+                if let Err(err) = res {
+                    warn!(
+                        "Invalid calendar object found at {principal}/{cal_id}/{object_id}.ics. Error: {err}",
+                        cal_id = calendar.id
+                    );
+                    success = false;
+                }
+            }
+        }
+        if !success {
+            if self.skip_broken {
+                error!(
+                    "Not all calendar objects are valid. Since data_store.sqlite.skip_broken=true they will be hidden. You are still advised to manually remove or repair the object. If you need help feel free to open up an issue on GitHub."
+                );
+            } else {
+                error!(
+                    "Not all calendar objects are valid. Since data_store.sqlite.skip_broken=false this causes a panic. Remove or repair the broken objects manually or set data_store.sqlite.skip_broken=false as a temporary solution to ignore the error. If you need help feel free to open up an issue on GitHub."
+                );
+                panic!();
+            }
+        }
+        Ok(())
+    }
+
    /// In the past exports generated objects with invalid VERSION:4.0
    /// This repair sets them to VERSION:2.0
    #[allow(clippy::missing_panics_doc)]
@@ -456,8 +504,8 @@ impl SqliteCalendarStore {
        executor: E,
        principal: &str,
        cal_id: &str,
-    ) -> Result<Vec<(String, CalendarObject)>, Error> {
-        sqlx::query_as!(
+    ) -> Result<impl Iterator<Item = (String, Result<CalendarObject, ParserError>)>, Error> {
+        Ok(sqlx::query_as!(
            CalendarObjectRow,
            "SELECT id, uid, ics FROM calendarobjects WHERE principal = ? AND cal_id = ? AND deleted_at IS NULL",
            principal,
@@ -466,8 +514,8 @@ impl SqliteCalendarStore {
        .fetch_all(executor)
        .await.map_err(crate::Error::from)?
        .into_iter()
-        .map(std::convert::TryInto::try_into)
-        .collect()
+        .map(Into::into)
+        )
    }

    async fn _calendar_query<'e, E: Executor<'e, Database = Sqlite>>(
@@ -475,14 +523,14 @@ impl SqliteCalendarStore {
        principal: &str,
        cal_id: &str,
        query: CalendarQuery,
-    ) -> Result<Vec<(String, CalendarObject)>, Error> {
+    ) -> Result<impl Iterator<Item = (String, Result<CalendarObject, ParserError>)>, Error> {
        // We extend our query interval by one day in each direction since we really don't want to
        // miss any objects because of timezone differences
        // I've previously tried NaiveDate::MIN,MAX, but it seems like sqlite cannot handle these
        let start = query.time_start.map(|start| start - TimeDelta::days(1));
        let end = query.time_end.map(|end| end + TimeDelta::days(1));

-        sqlx::query_as!(
+        Ok(sqlx::query_as!(
            CalendarObjectRow,
            r"SELECT id, uid, ics FROM calendarobjects
                WHERE principal = ? AND cal_id = ? AND deleted_at IS NULL
@@ -500,8 +548,7 @@ impl SqliteCalendarStore {
        .await
        .map_err(crate::Error::from)?
        .into_iter()
-        .map(std::convert::TryInto::try_into)
-        .collect()
+        .map(Into::into))
    }

    async fn _get_object<'e, E: Executor<'e, Database = Sqlite>>(
@@ -641,6 +688,7 @@ impl SqliteCalendarStore {
        principal: &str,
        cal_id: &str,
        synctoken: i64,
+        skip_broken: bool,
    ) -> Result<(Vec<(String, CalendarObject)>, Vec<String>, i64), Error> {
        struct Row {
            object_id: String,
@@ -670,6 +718,8 @@ impl SqliteCalendarStore {
            match Self::_get_object(&mut *conn, principal, cal_id, &object_id, false).await {
                Ok(object) => objects.push((object_id, object)),
                Err(rustical_store::Error::NotFound) => deleted_objects.push(object_id),
+                // Skip broken object
+                Err(rustical_store::Error::IcalError(_)) if skip_broken => (),
                Err(err) => return Err(err),
            }
        }
@@ -820,7 +870,16 @@ impl CalendarStore for SqliteCalendarStore {
        cal_id: &str,
        query: CalendarQuery,
    ) -> Result<Vec<(String, CalendarObject)>, Error> {
-        Self::_calendar_query(&self.db, principal, cal_id, query).await
+        let objects = Self::_calendar_query(&self.db, principal, cal_id, query).await?;
+        if self.skip_broken {
+            Ok(objects
+                .filter_map(|(id, res)| Some((id, res.ok()?)))
+                .collect())
+        } else {
+            Ok(objects
+                .map(|(id, res)| res.map(|obj| (id, obj)))
+                .collect::<Result<Vec<_>, _>>()?)
+        }
    }

    async fn calendar_metadata(
@@ -851,7 +910,16 @@ impl CalendarStore for SqliteCalendarStore {
        principal: &str,
        cal_id: &str,
    ) -> Result<Vec<(String, CalendarObject)>, Error> {
-        Self::_get_objects(&self.db, principal, cal_id).await
+        let objects = Self::_get_objects(&self.db, principal, cal_id).await?;
+        if self.skip_broken {
+            Ok(objects
+                .filter_map(|(id, res)| Some((id, res.ok()?)))
+                .collect())
+        } else {
+            Ok(objects
+                .map(|(id, res)| res.map(|obj| (id, obj)))
+                .collect::<Result<Vec<_>, _>>()?)
+        }
    }

    #[instrument]
@@ -974,7 +1042,7 @@ impl CalendarStore for SqliteCalendarStore {
        cal_id: &str,
        synctoken: i64,
    ) -> Result<(Vec<(String, CalendarObject)>, Vec<String>, i64), Error> {
-        Self::_sync_changes(&self.db, principal, cal_id, synctoken).await
+        Self::_sync_changes(&self.db, principal, cal_id, synctoken, self.skip_broken).await
    }

    fn is_read_only(&self, _cal_id: &str) -> bool {
--- a/crates/store_sqlite/src/error.rs
+++ b/crates/store_sqlite/src/error.rs
@@ -18,7 +18,7 @@ impl From<sqlx::Error> for Error {
            sqlx::Error::RowNotFound => Self::StoreError(rustical_store::Error::NotFound),
            sqlx::Error::Database(err) => {
                if err.is_unique_violation() {
-                    warn!("{err:?}");
+                    warn!("{err}");
                    Self::StoreError(rustical_store::Error::AlreadyExists)
                } else {
                    Self::SqlxError(sqlx::Error::Database(err))
--- a/crates/store_sqlite/src/tests/mod.rs
+++ b/crates/store_sqlite/src/tests/mod.rs
@@ -52,8 +52,8 @@ pub async fn test_store_context() -> TestStoreContext {
    let db = get_test_db().await;
    TestStoreContext {
        db: db.clone(),
-        addr_store: SqliteAddressbookStore::new(db.clone(), send_addr),
-        cal_store: SqliteCalendarStore::new(db.clone(), send_cal),
+        addr_store: SqliteAddressbookStore::new(db.clone(), send_addr, false),
+        cal_store: SqliteCalendarStore::new(db.clone(), send_cal, false),
        principal_store: SqlitePrincipalStore::new(db.clone()),
        sub_store: SqliteStore::new(db),
    }
--- a/crates/xml/src/namespace.rs
+++ b/crates/xml/src/namespace.rs
@@ -1,6 +1,6 @@
 use quick_xml::name::Namespace;

-#[derive(Debug, Clone, Default, PartialEq, Eq)]
+#[derive(Debug, Clone, Default, PartialEq, Eq, Hash)]
 pub struct NamespaceOwned(pub Vec<u8>);

 impl<'a> From<Namespace<'a>> for NamespaceOwned {
--- a/crates/xml/src/unparsed.rs
+++ b/crates/xml/src/unparsed.rs
@@ -1,18 +1,21 @@
 use std::io::BufRead;

-use quick_xml::events::BytesStart;
+use quick_xml::{events::BytesStart, name::ResolveResult};

-use crate::{XmlDeserialize, XmlError};
+use crate::{NamespaceOwned, XmlDeserialize, XmlError};

-// TODO: actually implement
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub struct Unparsed(String);
+pub struct Unparsed(pub Option<NamespaceOwned>, pub String);

 impl Unparsed {
    #[must_use]
-    pub fn tag_name(&self) -> String {
-        // TODO: respect namespace?
-        self.0.clone()
+    pub const fn ns(&self) -> Option<&NamespaceOwned> {
+        self.0.as_ref()
+    }
+
+    #[must_use]
+    pub const fn tag_name(&self) -> &str {
+        self.1.as_str()
    }
 }

@@ -27,7 +30,12 @@ impl XmlDeserialize for Unparsed {
            let mut buf = vec![];
            reader.read_to_end_into(start.name(), &mut buf)?;
        }
-        let tag_name = String::from_utf8_lossy(start.local_name().as_ref()).to_string();
-        Ok(Self(tag_name))
+        let (ns, tag_name) = reader.resolver().resolve_element(start.name());
+        let ns: Option<NamespaceOwned> = match ns {
+            ResolveResult::Bound(ns) => Some(ns.into()),
+            ResolveResult::Unbound | ResolveResult::Unknown(_) => None,
+        };
+        let tag_name = String::from_utf8_lossy(tag_name.as_ref()).to_string();
+        Ok(Self(ns, tag_name))
    }
 }
--- a/src/app.rs
+++ b/src/app.rs
@@ -9,7 +9,7 @@ use axum_extra::TypedHeader;
 use headers::{HeaderMapExt, UserAgent};
 use http::header::CONNECTION;
 use http::{HeaderValue, StatusCode};
-use rustical_caldav::caldav_router;
+use rustical_caldav::{CalDavConfig, caldav_router};
 use rustical_carddav::carddav_router;
 use rustical_frontend::nextcloud_login::nextcloud_login_router;
 use rustical_frontend::{FrontendConfig, frontend_router};
@@ -45,6 +45,7 @@ pub fn make_app<
    auth_provider: Arc<impl AuthenticationProvider>,
    frontend_config: FrontendConfig,
    oidc_config: Option<OidcConfig>,
+    caldav_config: CalDavConfig,
    nextcloud_login_config: &NextcloudLoginConfig,
    dav_push_enabled: bool,
    session_cookie_samesite_strict: bool,
@@ -54,6 +55,8 @@ pub fn make_app<
    let combined_cal_store =
        Arc::new(CombinedCalendarStore::new(cal_store).with_store(birthday_store));

+    let caldav_config = Arc::new(caldav_config);
+
    let mut router = Router::new()
        // endpoint to be used by healthcheck to see if rustical is online
        .route("/ping", axum::routing::get(async || "Pong!"))
@@ -63,6 +66,7 @@ pub fn make_app<
            combined_cal_store.clone(),
            subscription_store.clone(),
            false,
+            caldav_config.clone(),
        ))
        .merge(caldav_router(
            "/caldav-compat",
@@ -70,6 +74,7 @@ pub fn make_app<
            combined_cal_store.clone(),
            subscription_store.clone(),
            true,
+            caldav_config,
        ))
        .route(
            "/.well-known/caldav",
--- a/src/commands/mod.rs
+++ b/src/commands/mod.rs
@@ -3,6 +3,7 @@ use crate::config::{
    SqliteDataStoreConfig, TracingConfig,
 };
 use clap::Parser;
+use rustical_caldav::CalDavConfig;
 use rustical_frontend::FrontendConfig;

 pub mod health;
@@ -15,9 +16,11 @@ pub struct GenConfigArgs {}
 pub fn cmd_gen_config(_args: GenConfigArgs) -> anyhow::Result<()> {
    let config = Config {
        http: HttpConfig::default(),
+        caldav: CalDavConfig::default(),
        data_store: DataStoreConfig::Sqlite(SqliteDataStoreConfig {
            db_url: "/var/lib/rustical/db.sqlite3".to_owned(),
            run_repairs: true,
+            skip_broken: true,
        }),
        tracing: TracingConfig::default(),
        frontend: FrontendConfig {
--- a/src/config.rs
+++ b/src/config.rs
@@ -1,3 +1,4 @@
+use rustical_caldav::CalDavConfig;
 use rustical_frontend::FrontendConfig;
 use rustical_oidc::OidcConfig;
 use serde::{Deserialize, Serialize};
@@ -28,6 +29,8 @@ pub struct SqliteDataStoreConfig {
    pub db_url: String,
    #[serde(default = "default_true")]
    pub run_repairs: bool,
+    #[serde(default = "default_true")]
+    pub skip_broken: bool,
 }

 #[derive(Debug, Deserialize, Serialize)]
@@ -95,4 +98,6 @@ pub struct Config {
    pub dav_push: DavPushConfig,
    #[serde(default)]
    pub nextcloud_login: NextcloudLoginConfig,
+    #[serde(default)]
+    pub caldav: CalDavConfig,
 }
--- a/src/integration_tests/caldav/calendar.rs
+++ b/src/integration_tests/caldav/calendar.rs
@@ -8,7 +8,7 @@ use rustical_store::{CalendarMetadata, CalendarStore};
 use rustical_store_sqlite::tests::{TestStoreContext, test_store_context};
 use tower::ServiceExt;

-fn mkcalendar_template(
+pub fn mkcalendar_template(
    CalendarMetadata {
        displayname,
        order: _order,
--- a/src/integration_tests/caldav/calendar_put.rs
+++ b/src/integration_tests/caldav/calendar_put.rs
@@ -0,0 +1,77 @@
+use axum::body::Body;
+use headers::{Authorization, HeaderMapExt};
+use http::{Request, StatusCode};
+use rstest::rstest;
+use rustical_store::CalendarMetadata;
+use rustical_store_sqlite::tests::{TestStoreContext, test_store_context};
+use tower::ServiceExt;
+
+use crate::integration_tests::{
+    ResponseExtractString, caldav::calendar::mkcalendar_template, get_app,
+};
+
+#[rstest]
+#[tokio::test]
+async fn test_put_invalid(
+    #[from(test_store_context)]
+    #[future]
+    context: TestStoreContext,
+) {
+    let context = context.await;
+    let app = get_app(context.clone());
+
+    let calendar_meta = CalendarMetadata {
+        displayname: Some("Calendar".to_string()),
+        description: Some("Description".to_string()),
+        color: Some("#00FF00".to_string()),
+        order: 0,
+    };
+    let (principal, cal_id) = ("user", "calendar");
+    let url = format!("/caldav/principal/{principal}/{cal_id}");
+
+    let mut request = Request::builder()
+        .method("MKCALENDAR")
+        .uri(&url)
+        .body(Body::from(mkcalendar_template(&calendar_meta)))
+        .unwrap();
+    request
+        .headers_mut()
+        .typed_insert(Authorization::basic("user", "pass"));
+    let response = app.clone().oneshot(request).await.unwrap();
+    assert_eq!(response.status(), StatusCode::CREATED);
+
+    // Invalid calendar data
+    let ical = r"BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//Example Corp.//CalDAV Client//EN
+BEGIN:VEVENT
+UID:20010712T182145Z-123401@example.com
+DTSTAMP:20060712T182145Z
+DTSTART:20060714T170000Z
+RRULE:UNTIL=123
+DTEND:20060715T040000Z
+SUMMARY:Bastille Day Party
+END:VEVENT
+END:VCALENDAR";
+
+    let mut request = Request::builder()
+        .method("PUT")
+        .uri(format!("{url}/qwue23489.ics"))
+        .header("If-None-Match", "*")
+        .header("Content-Type", "text/calendar")
+        .body(Body::from(ical))
+        .unwrap();
+    request
+        .headers_mut()
+        .typed_insert(Authorization::basic("user", "pass"));
+
+    let response = app.clone().oneshot(request).await.unwrap();
+    assert_eq!(response.status(), StatusCode::FORBIDDEN);
+    let body = response.extract_string().await;
+    insta::assert_snapshot!(body, @r#"
+    <?xml version="1.0" encoding="utf-8"?>
+    <error xmlns="DAV:" xmlns:CAL="urn:ietf:params:xml:ns:caldav" xmlns:CARD="urn:ietf:params:xml:ns:carddav" xmlns:CS="http://calendarserver.org/ns/" xmlns:PUSH="https://bitfire.at/webdav-push">
+        <CAL:valid-calendar-data/>
+    </error>
+    "#);
+}
--- a/src/integration_tests/caldav/mod.rs
+++ b/src/integration_tests/caldav/mod.rs
@@ -9,6 +9,7 @@ use tower::ServiceExt;

 mod calendar;
 mod calendar_import;
+mod calendar_put;
 mod calendar_report;

 #[rstest]
--- a/src/integration_tests/caldav/snapshots/rustical__integration_testscaldavcalendar__multiget_body.snap
+++ b/src/integration_tests/caldav/snapshots/rustical__integration_testscaldavcalendar__multiget_body.snap
@@ -8,7 +8,7 @@ expression: body
        <href>/caldav/principal/user/calendar/qwue23489.ics</href>
        <propstat>
            <prop>
-                <getetag>&quot;aea50382a7775bb9742bfec277382e3a260b6066f503b5f5ae34548d7215ee46&quot;</getetag>
+                <getetag>&quot;f781224669f0db2674e9e45a9be2b01774c02136e3fb72792ef217bccf49fafa&quot;</getetag>
            </prop>
            <status>HTTP/1.1 200 OK</status>
        </propstat>
--- a/src/integration_tests/caldav/snapshots/rustical__integration_testscaldavcalendar__propfind_body.snap
+++ b/src/integration_tests/caldav/snapshots/rustical__integration_testscaldavcalendar__propfind_body.snap
@@ -14,9 +14,10 @@ expression: body
 PRODID:-//github.com/lennart-k/vzic-rs//RustiCal Calendar server//EN
 VERSION:2.0
 BEGIN:VTIMEZONE
-TZID:America/New_York
-LAST-MODIFIED:20250723T190331Z
-X-LIC-LOCATION:America/New_York
+TZID:US/Eastern
+TZID-ALIAS-OF:America/New_York
+LAST-MODIFIED:20260124T185655Z
+X-LIC-LOCATION:US/Eastern
 X-PROLEPTIC-TZNAME:LMT
 BEGIN:STANDARD
 TZNAME:EST
--- a/src/integration_tests/mod.rs
+++ b/src/integration_tests/mod.rs
@@ -2,6 +2,7 @@ use crate::{app::make_app, config::NextcloudLoginConfig};
 use axum::extract::Request;
 use axum::{body::Body, response::Response};
 use rstest::rstest;
+use rustical_caldav::CalDavConfig;
 use rustical_frontend::FrontendConfig;
 use rustical_store_sqlite::tests::{TestStoreContext, test_store_context};
 use std::sync::Arc;
@@ -26,6 +27,7 @@ pub fn get_app(context: TestStoreContext) -> axum::Router {
            allow_password_login: true,
        },
        None,
+        CalDavConfig::default(),
        &NextcloudLoginConfig { enabled: false },
        false,
        true,
--- a/src/main.rs
+++ b/src/main.rs
@@ -34,9 +34,6 @@ mod config;
 pub mod integration_tests;
 mod setup_tracing;

-mod migration_0_12;
-use migration_0_12::{validate_address_objects_0_12, validate_calendar_objects_0_12};
-
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]
 struct Args {
@@ -73,13 +70,18 @@ async fn get_data_stores(
        DataStoreConfig::Sqlite(SqliteDataStoreConfig {
            db_url,
            run_repairs,
+            skip_broken,
        }) => {
            let db = create_db_pool(db_url, migrate).await?;
            // Channel to watch for changes (for DAV Push)
            let (send, recv) = tokio::sync::mpsc::channel(1000);

-            let addressbook_store = Arc::new(SqliteAddressbookStore::new(db.clone(), send.clone()));
-            let cal_store = Arc::new(SqliteCalendarStore::new(db.clone(), send));
+            let addressbook_store = Arc::new(SqliteAddressbookStore::new(
+                db.clone(),
+                send.clone(),
+                *skip_broken,
+            ));
+            let cal_store = Arc::new(SqliteCalendarStore::new(db.clone(), send, *skip_broken));
            if *run_repairs {
                info!("Running repair tasks");
                addressbook_store.repair_orphans().await?;
@@ -88,6 +90,13 @@ async fn get_data_stores(
            }
            let subscription_store = Arc::new(SqliteStore::new(db.clone()));
            let principal_store = Arc::new(SqlitePrincipalStore::new(db));
+
+            // Validate all calendar objects
+            for principal in principal_store.get_principals().await? {
+                cal_store.validate_objects(&principal.id).await?;
+                addressbook_store.validate_objects(&principal.id).await?;
+            }
+
            (
                addressbook_store,
                cal_store,
@@ -125,14 +134,6 @@ async fn main() -> Result<()> {
            let (addr_store, cal_store, subscription_store, principal_store, update_recv) =
                get_data_stores(!args.no_migrations, &config.data_store).await?;

-            warn!(
-                "Validating calendar data against the next-version ical parser.
-In the next major release these will be rejected and cause errors.
-If any errors occur, please open an issue so they can be fixed before the next major release."
-            );
-            validate_calendar_objects_0_12(principal_store.as_ref(), cal_store.as_ref()).await?;
-            validate_address_objects_0_12(principal_store.as_ref(), addr_store.as_ref()).await?;
-
            let mut tasks = vec![];

            if config.dav_push.enabled {
@@ -152,6 +153,7 @@ If any errors occur, please open an issue so they can be fixed before the next m
                principal_store.clone(),
                config.frontend.clone(),
                config.oidc.clone(),
+                config.caldav,
                &config.nextcloud_login,
                config.dav_push.enabled,
                config.http.session_cookie_samesite_strict,
--- a/src/migration_0_12.rs
+++ b/src/migration_0_12.rs
@@ -1,76 +0,0 @@
-use ical::parser::{ical::IcalObjectParser, vcard::VcardParser};
-use rustical_store::{AddressbookStore, CalendarStore, auth::AuthenticationProvider};
-use tracing::{error, info};
-
-pub async fn validate_calendar_objects_0_12(
-    principal_store: &impl AuthenticationProvider,
-    cal_store: &impl CalendarStore,
-) -> Result<(), rustical_store::Error> {
-    let mut success = true;
-    for principal in principal_store.get_principals().await? {
-        for calendar in cal_store.get_calendars(&principal.id).await? {
-            for (object_id, object) in cal_store
-                .get_objects(&calendar.principal, &calendar.id)
-                .await?
-            {
-                if let Err(err) =
-                    IcalObjectParser::from_slice(object.get_ics().as_bytes()).expect_one()
-                {
-                    success = false;
-                    error!(
-                        "An error occured parsing a calendar object: principal={principal}, calendar={calendar}, object_id={object_id}: {err}",
-                        principal = principal.id,
-                        calendar = calendar.id,
-                    );
-                    println!("{}", object.get_ics());
-                }
-            }
-        }
-    }
-    if success {
-        info!("Your calendar data seems to be valid in the next major version.");
-    } else {
-        error!(
-            "Not all calendar objects will be successfully parsed in the next major version (v0.12).
-This will not cause issues in this version, but please comment under the tracking issue on GitHub:
-https://github.com/lennart-k/rustical/issues/165"
-        );
-    }
-    Ok(())
-}
-
-pub async fn validate_address_objects_0_12(
-    principal_store: &impl AuthenticationProvider,
-    addr_store: &impl AddressbookStore,
-) -> Result<(), rustical_store::Error> {
-    let mut success = true;
-    for principal in principal_store.get_principals().await? {
-        for addressbook in addr_store.get_addressbooks(&principal.id).await? {
-            for (object_id, object) in addr_store
-                .get_objects(&addressbook.principal, &addressbook.id)
-                .await?
-            {
-                if let Err(err) = VcardParser::from_slice(object.get_vcf().as_bytes()).expect_one()
-                {
-                    success = false;
-                    error!(
-                        "An error occured parsing an address object: principal={principal}, addressbook={addressbook}, object_id={object_id}: {err}",
-                        principal = principal.id,
-                        addressbook = addressbook.id,
-                    );
-                    println!("{}", object.get_vcf());
-                }
-            }
-        }
-    }
-    if success {
-        info!("Your addressbook data seems to be valid in the next major version.");
-    } else {
-        error!(
-            "Not all address objects will be successfully parsed in the next major version (v0.12).
-This will not cause issues in this version, but please comment under the tracking issue on GitHub:
-https://github.com/lennart-k/rustical/issues/165"
-        );
-    }
-    Ok(())
-}
Author	SHA1	Message	Date
Lennart	b89ff1a2b5	version 0.12.3	2026-01-24 22:49:02 +01:00
Lennart	246a1aa738	Add truncation for automatically derived timezones	2026-01-24 22:48:08 +01:00
Lennart	bb0484ac4a	version 0.12.2	2026-01-24 20:09:42 +01:00
Lennart	1b3da2a99b	update caldata-rs	2026-01-24 20:07:38 +01:00
Lennart	3b01ae1cf6	update test snapshots	2026-01-24 19:52:13 +01:00
Lennart K	d918a255a9	PUT calendar_object: Allow omission of timezones as in RFC7809	2026-01-24 19:44:58 +01:00
Lennart K	6a31d3000c	Update vtimezones-rs	2026-01-24 18:05:42 +01:00
Lennart K	d5892ab56b	Migrate ical-rs to caldata-rs	2026-01-22 11:01:00 +01:00
Lennart K	11a61cf8b1	version 0.12.1	2026-01-20 13:20:04 +01:00
Lennart Kämmle	227d4bc61a	Merge pull request #171 from wrvsrx/fix-anniversayr-typo Fix a typo about anniversary	2026-01-20 13:17:44 +01:00
wrvsrx	d9afc85222	Fix a typo about anniversary	2026-01-20 19:45:50 +08:00
Lennart	c9fe5706a9	clippy appeasement	2026-01-19 17:03:14 +01:00
Lennart	1b6214d426	MKCALENDAR: Handling of invalid timezones	2026-01-19 16:36:25 +01:00
Lennart	be34cc3091	xml: Implement namespace for Unparsed	2026-01-19 16:22:21 +01:00
Lennart	99287f85f4	version 0.12.0	2026-01-19 15:48:56 +01:00
Lennart	df3143cd4c	Fix status code for failed preconditions	2026-01-19 15:37:41 +01:00
Lennart Kämmle	92a3418f8e	Merge pull request #164 from lennart-k/feat/ical-rewrite ical-rs overhaul	2026-01-19 15:14:14 +01:00
Lennart	ea2f841269	ical-rs: Pin version to Git commit	2026-01-19 15:04:54 +01:00
Lennart	15e1509fe3	sqlite_store: Add option to skip broken objects and add validation on start-up	2026-01-19 14:48:21 +01:00
Lennart	0eef4ffabf	Add test for uploading invalid calendar object and fix precondition	2026-01-19 13:40:54 +01:00