Merge branch 'caldav'

1 files changed, 1036 insertions, 0 deletions

diff --git a/aero-dav/src/calencoder.rs b/aero-dav/src/calencoder.rs
new file mode 100644
index 0000000..15df965
--- /dev/null
+++ b/aero-dav/src/calencoder.rs
@@ -0,0 +1,1036 @@
+use quick_xml::events::{BytesText, Event};
+use quick_xml::Error as QError;
+
+use super::caltypes::*;
+use super::types::Extension;
+use super::xml::{IWrite, Node, QWrite, Writer};
+
+// ==================== Calendar Types Serialization =========================
+
+// -------------------- MKCALENDAR METHOD ------------------------------------
+impl<E: Extension> QWrite for MkCalendar<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("mkcalendar");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for MkCalendarResponse<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("mkcalendar-response");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        for propstat in self.0.iter() {
+            propstat.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+// ----------------------- REPORT METHOD -------------------------------------
+impl QWrite for ReportTypeName {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Query => {
+                let start = xml.create_dav_element("calendar-query");
+                xml.q.write_event_async(Event::Empty(start)).await
+            }
+            Self::Multiget => {
+                let start = xml.create_dav_element("calendar-multiget");
+                xml.q.write_event_async(Event::Empty(start)).await
+            }
+            Self::FreeBusy => {
+                let start = xml.create_dav_element("free-busy-query");
+                xml.q.write_event_async(Event::Empty(start)).await
+            }
+        }
+    }
+}
+
+impl<E: Extension> QWrite for ReportType<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Query(v) => v.qwrite(xml).await,
+            Self::Multiget(v) => v.qwrite(xml).await,
+            Self::FreeBusy(v) => v.qwrite(xml).await,
+        }
+    }
+}
+
+impl<E: Extension> QWrite for CalendarQuery<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("calendar-query");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        if let Some(selector) = &self.selector {
+            selector.qwrite(xml).await?;
+        }
+        self.filter.qwrite(xml).await?;
+        if let Some(tz) = &self.timezone {
+            tz.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for CalendarMultiget<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("calendar-multiget");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        if let Some(selector) = &self.selector {
+            selector.qwrite(xml).await?;
+        }
+        for href in self.href.iter() {
+            href.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for FreeBusyQuery {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("free-busy-query");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+// -------------------------- DAV::prop --------------------------------------
+impl QWrite for PropertyRequest {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut atom = async |c| {
+            let empty_tag = xml.create_cal_element(c);
+            xml.q.write_event_async(Event::Empty(empty_tag)).await
+        };
+
+        match self {
+            Self::CalendarHomeSet => atom("calendar-home-set").await,
+            Self::CalendarDescription => atom("calendar-description").await,
+            Self::CalendarTimezone => atom("calendar-timezone").await,
+            Self::SupportedCalendarComponentSet => atom("supported-calendar-component-set").await,
+            Self::SupportedCalendarData => atom("supported-calendar-data").await,
+            Self::MaxResourceSize => atom("max-resource-size").await,
+            Self::MinDateTime => atom("min-date-time").await,
+            Self::MaxDateTime => atom("max-date-time").await,
+            Self::MaxInstances => atom("max-instances").await,
+            Self::MaxAttendeesPerInstance => atom("max-attendees-per-instance").await,
+            Self::SupportedCollationSet => atom("supported-collation-set").await,
+            Self::CalendarData(req) => req.qwrite(xml).await,
+        }
+    }
+}
+impl QWrite for Property {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::CalendarHomeSet(href) => {
+                let start = xml.create_cal_element("calendar-home-set");
+                let end = start.to_end();
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                href.qwrite(xml).await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::CalendarDescription { lang, text } => {
+                let mut start = xml.create_cal_element("calendar-description");
+                if let Some(the_lang) = lang {
+                    start.push_attribute(("xml:lang", the_lang.as_str()));
+                }
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(text)))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::CalendarTimezone(payload) => {
+                let start = xml.create_cal_element("calendar-timezone");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(payload)))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::SupportedCalendarComponentSet(many_comp) => {
+                let start = xml.create_cal_element("supported-calendar-component-set");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                for comp in many_comp.iter() {
+                    comp.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::SupportedCalendarData(many_mime) => {
+                let start = xml.create_cal_element("supported-calendar-data");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                for mime in many_mime.iter() {
+                    mime.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::MaxResourceSize(bytes) => {
+                let start = xml.create_cal_element("max-resource-size");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(bytes.to_string().as_str())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::MinDateTime(dt) => {
+                let start = xml.create_cal_element("min-date-time");
+                let end = start.to_end();
+
+                let dtstr = format!("{}", dt.format(UTC_DATETIME_FMT));
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(dtstr.as_str())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::MaxDateTime(dt) => {
+                let start = xml.create_cal_element("max-date-time");
+                let end = start.to_end();
+
+                let dtstr = format!("{}", dt.format(UTC_DATETIME_FMT));
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(dtstr.as_str())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::MaxInstances(count) => {
+                let start = xml.create_cal_element("max-instances");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(count.to_string().as_str())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::MaxAttendeesPerInstance(count) => {
+                let start = xml.create_cal_element("max-attendees-per-instance");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(count.to_string().as_str())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::SupportedCollationSet(many_collations) => {
+                let start = xml.create_cal_element("supported-collation-set");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                for collation in many_collations.iter() {
+                    collation.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::CalendarData(inner) => inner.qwrite(xml).await,
+        }
+    }
+}
+
+// ---------------------- DAV::resourcetype ----------------------------------
+impl QWrite for ResourceType {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Calendar => {
+                let empty_tag = xml.create_cal_element("calendar");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+        }
+    }
+}
+
+// --------------------------- DAV::error ------------------------------------
+impl QWrite for Violation {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut atom = async |c| {
+            let empty_tag = xml.create_cal_element(c);
+            xml.q.write_event_async(Event::Empty(empty_tag)).await
+        };
+
+        match self {
+            //@FIXME
+            // DAV elements, should not be here but in RFC3744 on ACLs
+            // (we do not use atom as this error is in the DAV namespace, not the caldav one)
+            Self::NeedPrivileges => {
+                let empty_tag = xml.create_dav_element("need-privileges");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+
+            // Regular CalDAV errors
+            Self::ResourceMustBeNull => atom("resource-must-be-null").await,
+            Self::CalendarCollectionLocationOk => atom("calendar-collection-location-ok").await,
+            Self::ValidCalendarData => atom("valid-calendar-data").await,
+            Self::InitializeCalendarCollection => atom("initialize-calendar-collection").await,
+            Self::SupportedCalendarData => atom("supported-calendar-data").await,
+            Self::ValidCalendarObjectResource => atom("valid-calendar-object-resource").await,
+            Self::SupportedCalendarComponent => atom("supported-calendar-component").await,
+            Self::NoUidConflict(href) => {
+                let start = xml.create_cal_element("no-uid-conflict");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                href.qwrite(xml).await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::MaxResourceSize => atom("max-resource-size").await,
+            Self::MinDateTime => atom("min-date-time").await,
+            Self::MaxDateTime => atom("max-date-time").await,
+            Self::MaxInstances => atom("max-instances").await,
+            Self::MaxAttendeesPerInstance => atom("max-attendees-per-instance").await,
+            Self::ValidFilter => atom("valid-filter").await,
+            Self::SupportedFilter { comp, prop, param } => {
+                let start = xml.create_cal_element("supported-filter");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                for comp_item in comp.iter() {
+                    comp_item.qwrite(xml).await?;
+                }
+                for prop_item in prop.iter() {
+                    prop_item.qwrite(xml).await?;
+                }
+                for param_item in param.iter() {
+                    param_item.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::NumberOfMatchesWithinLimits => atom("number-of-matches-within-limits").await,
+        }
+    }
+}
+
+// ---------------------------- Inner XML ------------------------------------
+impl QWrite for SupportedCollation {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("supported-collation");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for Collation {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let col = match self {
+            Self::AsciiCaseMap => "i;ascii-casemap",
+            Self::Octet => "i;octet",
+            Self::Unknown(v) => v.as_str(),
+        };
+
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(col)))
+            .await
+    }
+}
+
+impl QWrite for CalendarDataSupport {
+    async fn qwrite(&self, _xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        unreachable!();
+    }
+}
+
+impl QWrite for CalendarDataPayload {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("calendar-data");
+        if let Some(mime) = &self.mime {
+            start.push_attribute(("content-type", mime.content_type.as_str()));
+            start.push_attribute(("version", mime.version.as_str()));
+        }
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(self.payload.as_str())))
+            .await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for CalendarDataRequest {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("calendar-data");
+        if let Some(mime) = &self.mime {
+            start.push_attribute(("content-type", mime.content_type.as_str()));
+            start.push_attribute(("version", mime.version.as_str()));
+        }
+
+        // Empty tag
+        if self.comp.is_none() && self.recurrence.is_none() && self.limit_freebusy_set.is_none() {
+            return xml.q.write_event_async(Event::Empty(start.clone())).await;
+        }
+
+        let end = start.to_end();
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        if let Some(comp) = &self.comp {
+            comp.qwrite(xml).await?;
+        }
+        if let Some(recurrence) = &self.recurrence {
+            recurrence.qwrite(xml).await?;
+        }
+        if let Some(freebusy) = &self.limit_freebusy_set {
+            freebusy.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for CalendarDataEmpty {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("calendar-data");
+        if let Some(mime) = &self.0 {
+            empty.push_attribute(("content-type", mime.content_type.as_str()));
+            empty.push_attribute(("version", mime.version.as_str()));
+        }
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+impl QWrite for Comp {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("comp");
+        start.push_attribute(("name", self.name.as_str()));
+        match (&self.prop_kind, &self.comp_kind) {
+            (None, None) => xml.q.write_event_async(Event::Empty(start)).await,
+            _ => {
+                let end = start.to_end();
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                if let Some(prop_kind) = &self.prop_kind {
+                    prop_kind.qwrite(xml).await?;
+                }
+                if let Some(comp_kind) = &self.comp_kind {
+                    comp_kind.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await
+            }
+        }
+    }
+}
+
+impl QWrite for CompSupport {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("comp");
+        empty.push_attribute(("name", self.0.as_str()));
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+impl QWrite for CompKind {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::AllComp => {
+                let empty_tag = xml.create_cal_element("allcomp");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::Comp(many_comp) => {
+                for comp in many_comp.iter() {
+                    // Required: recursion in an async fn requires boxing
+                    // rustc --explain E0733
+                    // Cycle detected when computing type of ...
+                    // For more information about this error, try `rustc --explain E0391`.
+                    // https://github.com/rust-lang/rust/issues/78649
+                    #[inline(always)]
+                    fn recurse<'a>(
+                        comp: &'a Comp,
+                        xml: &'a mut Writer<impl IWrite>,
+                    ) -> futures::future::BoxFuture<'a, Result<(), QError>> {
+                        Box::pin(comp.qwrite(xml))
+                    }
+                    recurse(comp, xml).await?;
+                }
+                Ok(())
+            }
+        }
+    }
+}
+
+impl QWrite for PropKind {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::AllProp => {
+                let empty_tag = xml.create_cal_element("allprop");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::Prop(many_prop) => {
+                for prop in many_prop.iter() {
+                    prop.qwrite(xml).await?;
+                }
+                Ok(())
+            }
+        }
+    }
+}
+
+impl QWrite for CalProp {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("prop");
+        empty.push_attribute(("name", self.name.0.as_str()));
+        match self.novalue {
+            None => (),
+            Some(true) => empty.push_attribute(("novalue", "yes")),
+            Some(false) => empty.push_attribute(("novalue", "no")),
+        }
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+impl QWrite for RecurrenceModifier {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Expand(exp) => exp.qwrite(xml).await,
+            Self::LimitRecurrenceSet(lrs) => lrs.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for Expand {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("expand");
+        empty.push_attribute((
+            "start",
+            format!("{}", self.0.format(UTC_DATETIME_FMT)).as_str(),
+        ));
+        empty.push_attribute((
+            "end",
+            format!("{}", self.1.format(UTC_DATETIME_FMT)).as_str(),
+        ));
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+impl QWrite for LimitRecurrenceSet {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("limit-recurrence-set");
+        empty.push_attribute((
+            "start",
+            format!("{}", self.0.format(UTC_DATETIME_FMT)).as_str(),
+        ));
+        empty.push_attribute((
+            "end",
+            format!("{}", self.1.format(UTC_DATETIME_FMT)).as_str(),
+        ));
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+impl QWrite for LimitFreebusySet {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("limit-freebusy-set");
+        empty.push_attribute((
+            "start",
+            format!("{}", self.0.format(UTC_DATETIME_FMT)).as_str(),
+        ));
+        empty.push_attribute((
+            "end",
+            format!("{}", self.1.format(UTC_DATETIME_FMT)).as_str(),
+        ));
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+impl<E: Extension> QWrite for CalendarSelector<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::AllProp => {
+                let empty_tag = xml.create_dav_element("allprop");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::PropName => {
+                let empty_tag = xml.create_dav_element("propname");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::Prop(prop) => prop.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for CompFilter {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("comp-filter");
+        start.push_attribute(("name", self.name.as_str()));
+
+        match &self.additional_rules {
+            None => xml.q.write_event_async(Event::Empty(start)).await,
+            Some(rules) => {
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                rules.qwrite(xml).await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+        }
+    }
+}
+
+impl QWrite for CompFilterRules {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::IsNotDefined => {
+                let empty_tag = xml.create_dav_element("is-not-defined");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::Matches(cfm) => cfm.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for CompFilterMatch {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        if let Some(time_range) = &self.time_range {
+            time_range.qwrite(xml).await?;
+        }
+
+        for prop_item in self.prop_filter.iter() {
+            prop_item.qwrite(xml).await?;
+        }
+        for comp_item in self.comp_filter.iter() {
+            // Required: recursion in an async fn requires boxing
+            // rustc --explain E0733
+            // Cycle detected when computing type of ...
+            // For more information about this error, try `rustc --explain E0391`.
+            // https://github.com/rust-lang/rust/issues/78649
+            #[inline(always)]
+            fn recurse<'a>(
+                comp: &'a CompFilter,
+                xml: &'a mut Writer<impl IWrite>,
+            ) -> futures::future::BoxFuture<'a, Result<(), QError>> {
+                Box::pin(comp.qwrite(xml))
+            }
+            recurse(comp_item, xml).await?;
+        }
+        Ok(())
+    }
+}
+
+impl QWrite for PropFilter {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("prop-filter");
+        start.push_attribute(("name", self.name.0.as_str()));
+
+        match &self.additional_rules {
+            None => xml.q.write_event_async(Event::Empty(start.clone())).await,
+            Some(rules) => {
+                let end = start.to_end();
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                rules.qwrite(xml).await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+        }
+    }
+}
+
+impl QWrite for PropFilterRules {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::IsNotDefined => {
+                let empty_tag = xml.create_dav_element("is-not-defined");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::Match(prop_match) => prop_match.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for PropFilterMatch {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        if let Some(time_or_text) = &self.time_or_text {
+            time_or_text.qwrite(xml).await?;
+        }
+        for param_item in self.param_filter.iter() {
+            param_item.qwrite(xml).await?;
+        }
+        Ok(())
+    }
+}
+
+impl QWrite for TimeOrText {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Time(time) => time.qwrite(xml).await,
+            Self::Text(txt) => txt.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for TextMatch {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("text-match");
+        if let Some(collation) = &self.collation {
+            start.push_attribute(("collation", collation.as_str()));
+        }
+        match self.negate_condition {
+            None => (),
+            Some(true) => start.push_attribute(("negate-condition", "yes")),
+            Some(false) => start.push_attribute(("negate-condition", "no")),
+        }
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(self.text.as_str())))
+            .await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for ParamFilter {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("param-filter");
+        start.push_attribute(("name", self.name.as_str()));
+
+        match &self.additional_rules {
+            None => xml.q.write_event_async(Event::Empty(start)).await,
+            Some(rules) => {
+                let end = start.to_end();
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                rules.qwrite(xml).await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+        }
+    }
+}
+
+impl QWrite for ParamFilterMatch {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::IsNotDefined => {
+                let empty_tag = xml.create_dav_element("is-not-defined");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::Match(tm) => tm.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for TimeZone {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("timezone");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(self.0.as_str())))
+            .await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for Filter {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("filter");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for TimeRange {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("time-range");
+        match self {
+            Self::OnlyStart(start) => empty.push_attribute((
+                "start",
+                format!("{}", start.format(UTC_DATETIME_FMT)).as_str(),
+            )),
+            Self::OnlyEnd(end) => {
+                empty.push_attribute(("end", format!("{}", end.format(UTC_DATETIME_FMT)).as_str()))
+            }
+            Self::FullRange(start, end) => {
+                empty.push_attribute((
+                    "start",
+                    format!("{}", start.format(UTC_DATETIME_FMT)).as_str(),
+                ));
+                empty.push_attribute(("end", format!("{}", end.format(UTC_DATETIME_FMT)).as_str()));
+            }
+        }
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::realization::Calendar;
+    use crate::types as dav;
+    use chrono::{TimeZone, Utc};
+    use tokio::io::AsyncWriteExt;
+
+    async fn serialize(elem: &impl QWrite) -> String {
+        let mut buffer = Vec::new();
+        let mut tokio_buffer = tokio::io::BufWriter::new(&mut buffer);
+        let q = quick_xml::writer::Writer::new_with_indent(&mut tokio_buffer, b' ', 4);
+        let ns_to_apply = vec![
+            ("xmlns:D".into(), "DAV:".into()),
+            ("xmlns:C".into(), "urn:ietf:params:xml:ns:caldav".into()),
+        ];
+        let mut writer = Writer { q, ns_to_apply };
+
+        elem.qwrite(&mut writer).await.expect("xml serialization");
+        tokio_buffer.flush().await.expect("tokio buffer flush");
+        let got = std::str::from_utf8(buffer.as_slice()).unwrap();
+
+        return got.into();
+    }
+
+    #[tokio::test]
+    async fn basic_violation() {
+        let got = serialize(&dav::Error::<Calendar>(vec![dav::Violation::Extension(
+            Violation::ResourceMustBeNull,
+        )]))
+        .await;
+
+        let expected = r#"<D:error xmlns:D="DAV:" xmlns:C="urn:ietf:params:xml:ns:caldav">
+    <C:resource-must-be-null/>
+</D:error>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+    }
+
+    #[tokio::test]
+    async fn rfc_calendar_query1_req() {
+        let got = serialize(&CalendarQuery::<Calendar> {
+            selector: Some(CalendarSelector::Prop(dav::PropName(vec![
+                dav::PropertyRequest::GetEtag,
+                dav::PropertyRequest::Extension(PropertyRequest::CalendarData(
+                    CalendarDataRequest {
+                        mime: None,
+                        comp: Some(Comp {
+                            name: Component::VCalendar,
+                            prop_kind: Some(PropKind::Prop(vec![CalProp {
+                                name: ComponentProperty("VERSION".into()),
+                                novalue: None,
+                            }])),
+                            comp_kind: Some(CompKind::Comp(vec![
+                                Comp {
+                                    name: Component::VEvent,
+                                    prop_kind: Some(PropKind::Prop(vec![
+                                        CalProp {
+                                            name: ComponentProperty("SUMMARY".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("UID".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("DTSTART".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("DTEND".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("DURATION".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("RRULE".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("RDATE".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("EXRULE".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("EXDATE".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("RECURRENCE-ID".into()),
+                                            novalue: None,
+                                        },
+                                    ])),
+                                    comp_kind: None,
+                                },
+                                Comp {
+                                    name: Component::VTimeZone,
+                                    prop_kind: None,
+                                    comp_kind: None,
+                                },
+                            ])),
+                        }),
+                        recurrence: None,
+                        limit_freebusy_set: None,
+                    },
+                )),
+            ]))),
+            filter: Filter(CompFilter {
+                name: Component::VCalendar,
+                additional_rules: Some(CompFilterRules::Matches(CompFilterMatch {
+                    time_range: None,
+                    prop_filter: vec![],
+                    comp_filter: vec![CompFilter {
+                        name: Component::VEvent,
+                        additional_rules: Some(CompFilterRules::Matches(CompFilterMatch {
+                            time_range: Some(TimeRange::FullRange(
+                                Utc.with_ymd_and_hms(2006, 1, 4, 0, 0, 0).unwrap(),
+                                Utc.with_ymd_and_hms(2006, 1, 5, 0, 0, 0).unwrap(),
+                            )),
+                            prop_filter: vec![],
+                            comp_filter: vec![],
+                        })),
+                    }],
+                })),
+            }),
+            timezone: None,
+        })
+        .await;
+
+        let expected = r#"<C:calendar-query xmlns:D="DAV:" xmlns:C="urn:ietf:params:xml:ns:caldav">
+    <D:prop>
+        <D:getetag/>
+        <C:calendar-data>
+            <C:comp name="VCALENDAR">
+                <C:prop name="VERSION"/>
+                <C:comp name="VEVENT">
+                    <C:prop name="SUMMARY"/>
+                    <C:prop name="UID"/>
+                    <C:prop name="DTSTART"/>
+                    <C:prop name="DTEND"/>
+                    <C:prop name="DURATION"/>
+                    <C:prop name="RRULE"/>
+                    <C:prop name="RDATE"/>
+                    <C:prop name="EXRULE"/>
+                    <C:prop name="EXDATE"/>
+                    <C:prop name="RECURRENCE-ID"/>
+                </C:comp>
+                <C:comp name="VTIMEZONE"/>
+            </C:comp>
+        </C:calendar-data>
+    </D:prop>
+    <C:filter>
+        <C:comp-filter name="VCALENDAR">
+            <C:comp-filter name="VEVENT">
+                <C:time-range start="20060104T000000Z" end="20060105T000000Z"/>
+            </C:comp-filter>
+        </C:comp-filter>
+    </C:filter>
+</C:calendar-query>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+    }
+
+    #[tokio::test]
+    async fn rfc_calendar_query1_res() {
+        let got = serialize(&dav::Multistatus::<Calendar> {
+            extension: None,
+            responses: vec![
+                dav::Response {
+                    status_or_propstat: dav::StatusOrPropstat::PropStat(
+                        dav::Href("http://cal.example.com/bernard/work/abcd2.ics".into()),
+                        vec![dav::PropStat {
+                            prop: dav::AnyProp(vec![
+                                dav::AnyProperty::Value(dav::Property::GetEtag(
+                                    "\"fffff-abcd2\"".into(),
+                                )),
+                                dav::AnyProperty::Value(dav::Property::Extension(
+                                    Property::CalendarData(CalendarDataPayload {
+                                        mime: None,
+                                        payload: "PLACEHOLDER".into(),
+                                    }),
+                                )),
+                            ]),
+                            status: dav::Status(http::status::StatusCode::OK),
+                            error: None,
+                            responsedescription: None,
+                        }],
+                    ),
+                    location: None,
+                    error: None,
+                    responsedescription: None,
+                },
+                dav::Response {
+                    status_or_propstat: dav::StatusOrPropstat::PropStat(
+                        dav::Href("http://cal.example.com/bernard/work/abcd3.ics".into()),
+                        vec![dav::PropStat {
+                            prop: dav::AnyProp(vec![
+                                dav::AnyProperty::Value(dav::Property::GetEtag(
+                                    "\"fffff-abcd3\"".into(),
+                                )),
+                                dav::AnyProperty::Value(dav::Property::Extension(
+                                    Property::CalendarData(CalendarDataPayload {
+                                        mime: None,
+                                        payload: "PLACEHOLDER".into(),
+                                    }),
+                                )),
+                            ]),
+                            status: dav::Status(http::status::StatusCode::OK),
+                            error: None,
+                            responsedescription: None,
+                        }],
+                    ),
+                    location: None,
+                    error: None,
+                    responsedescription: None,
+                },
+            ],
+            responsedescription: None,
+        })
+        .await;
+
+        let expected = r#"<D:multistatus xmlns:D="DAV:" xmlns:C="urn:ietf:params:xml:ns:caldav">
+    <D:response>
+        <D:href>http://cal.example.com/bernard/work/abcd2.ics</D:href>
+        <D:propstat>
+            <D:prop>
+                <D:getetag>&quot;fffff-abcd2&quot;</D:getetag>
+                <C:calendar-data>PLACEHOLDER</C:calendar-data>
+            </D:prop>
+            <D:status>HTTP/1.1 200 OK</D:status>
+        </D:propstat>
+    </D:response>
+    <D:response>
+        <D:href>http://cal.example.com/bernard/work/abcd3.ics</D:href>
+        <D:propstat>
+            <D:prop>
+                <D:getetag>&quot;fffff-abcd3&quot;</D:getetag>
+                <C:calendar-data>PLACEHOLDER</C:calendar-data>
+            </D:prop>
+            <D:status>HTTP/1.1 200 OK</D:status>
+        </D:propstat>
+    </D:response>
+</D:multistatus>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+    }
+}