move core::pdu and core::state_res into core::matrix::

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/matrix/pdu/redact.rs

@@ -0,0 +1,117 @@
+use ruma::{
+	OwnedEventId, RoomVersionId,
+	canonical_json::redact_content_in_place,
+	events::{TimelineEventType, room::redaction::RoomRedactionEventContent},
+};
+use serde::Deserialize;
+use serde_json::{
+	json,
+	value::{RawValue as RawJsonValue, to_raw_value},
+};
+
+use crate::{Error, Result, implement};
+
+#[derive(Deserialize)]
+struct ExtractRedactedBecause {
+	redacted_because: Option<serde::de::IgnoredAny>,
+}
+
+#[implement(super::Pdu)]
+pub fn redact(&mut self, room_version_id: &RoomVersionId, reason: &Self) -> Result {
+	self.unsigned = None;
+
+	let mut content = serde_json::from_str(self.content.get())
+		.map_err(|_| Error::bad_database("PDU in db has invalid content."))?;
+
+	redact_content_in_place(&mut content, room_version_id, self.kind.to_string())
+		.map_err(|e| Error::Redaction(self.sender.server_name().to_owned(), e))?;
+
+	self.unsigned = Some(
+		to_raw_value(&json!({
+			"redacted_because": serde_json::to_value(reason).expect("to_value(Pdu) always works")
+		}))
+		.expect("to string always works"),
+	);
+
+	self.content = to_raw_value(&content).expect("to string always works");
+
+	Ok(())
+}
+
+#[implement(super::Pdu)]
+#[must_use]
+pub fn is_redacted(&self) -> bool {
+	let Some(unsigned) = &self.unsigned else {
+		return false;
+	};
+
+	let Ok(unsigned) = ExtractRedactedBecause::deserialize(&**unsigned) else {
+		return false;
+	};
+
+	unsigned.redacted_because.is_some()
+}
+
+/// Copies the `redacts` property of the event to the `content` dict and
+/// vice-versa.
+///
+/// This follows the specification's
+/// [recommendation](https://spec.matrix.org/v1.10/rooms/v11/#moving-the-redacts-property-of-mroomredaction-events-to-a-content-property):
+///
+/// > For backwards-compatibility with older clients, servers should add a
+/// > redacts
+/// > property to the top level of m.room.redaction events in when serving
+/// > such events
+/// > over the Client-Server API.
+///
+/// > For improved compatibility with newer clients, servers should add a
+/// > redacts property
+/// > to the content of m.room.redaction events in older room versions when
+/// > serving
+/// > such events over the Client-Server API.
+#[implement(super::Pdu)]
+#[must_use]
+pub fn copy_redacts(&self) -> (Option<OwnedEventId>, Box<RawJsonValue>) {
+	if self.kind == TimelineEventType::RoomRedaction {
+		if let Ok(mut content) =
+			serde_json::from_str::<RoomRedactionEventContent>(self.content.get())
+		{
+			match content.redacts {
+				| Some(redacts) => {
+					return (Some(redacts), self.content.clone());
+				},
+				| _ => match self.redacts.clone() {
+					| Some(redacts) => {
+						content.redacts = Some(redacts);
+						return (
+							self.redacts.clone(),
+							to_raw_value(&content)
+								.expect("Must be valid, we only added redacts field"),
+						);
+					},
+					| _ => {},
+				},
+			}
+		}
+	}
+
+	(self.redacts.clone(), self.content.clone())
+}
+
+#[implement(super::Pdu)]
+#[must_use]
+pub fn redacts_id(&self, room_version: &RoomVersionId) -> Option<OwnedEventId> {
+	use RoomVersionId::*;
+
+	if self.kind != TimelineEventType::RoomRedaction {
+		return None;
+	}
+
+	match *room_version {
+		| V1 | V2 | V3 | V4 | V5 | V6 | V7 | V8 | V9 | V10 => self.redacts.clone(),
+		| _ =>
+			self.get_content::<RoomRedactionEventContent>()
+				.ok()?
+				.redacts,
+	}
+}