Add AvatarEvent and ImageInfo.

src/room/avatar.rs

@@ -1 +1,59 @@
 //! Types for the *m.room.avatar* event.
+
+use core::{Event, RoomEvent, StateEvent};
+use super::ImageInfo;
+
+/// A picture that is associated with the room.
+///
+/// This can be displayed alongside the room information.
+pub struct AvatarEvent<'a, 'b> {
+    content: AvatarEventContent<'a>,
+    event_id: &'a str,
+    prev_content: Option<AvatarEventContent<'b>>,
+    room_id: &'a str,
+    user_id: &'a str,
+}
+
+impl<'a, 'b> Event<'a, AvatarEventContent<'a>> for AvatarEvent<'a, 'b> {
+    fn content(&'a self) -> &'a AvatarEventContent<'a> {
+        &self.content
+    }
+
+    fn event_type(&self) -> &'static str {
+        "m.room.avatar"
+    }
+}
+
+impl<'a, 'b> RoomEvent<'a, AvatarEventContent<'a>> for AvatarEvent<'a, 'b> {
+    fn event_id(&'a self) -> &'a str {
+        &self.event_id
+    }
+
+    fn room_id(&'a self) -> &'a str {
+        &self.room_id
+    }
+
+    fn user_id(&'a self) -> &'a str {
+        &self.user_id
+    }
+}
+
+impl<'a, 'b> StateEvent<'a, 'b, AvatarEventContent<'a>> for AvatarEvent<'a, 'b> {
+    fn prev_content(&'a self) -> Option<&'b AvatarEventContent> {
+        match self.prev_content {
+            Some(ref prev_content) => Some(prev_content),
+            None => None,
+        }
+    }
+
+    fn state_key(&self) -> &'a str {
+        ""
+    }
+}
+/// The payload of an `AvatarEvent`.
+pub struct AvatarEventContent<'a> {
+    info: &'a ImageInfo<'a>,
+    thumbnail_info: &'a ImageInfo<'a>,
+    thumbnail_url: &'a str,
+    url: &'a str,
+}

src/room/mod.rs

@@ -16,3 +16,11 @@ pub mod power_levels;
 pub mod redaction;
 pub mod third_party_invite;
 pub mod topic;
+
+/// Metadata about an image.
+pub struct ImageInfo<'a> {
+    height: u64,
+    mimetype: &'a str,
+    size: u64,
+    width: u64,
+}