Group member add and remove routes.

src/routes/channels/group_remove_member.rs

@@ -0,0 +1,69 @@
+use crate::util::result::{Error, Result};
+use crate::{database::*, notifications::events::ClientboundNotification};
+
+use mongodb::bson::doc;
+
+#[delete("/<target>/recipients/<member>")]
+pub async fn req(user: User, target: Ref, member: Ref) -> Result<()> {
+    if &user.id == &member.id {
+        Err(Error::CannotRemoveYourself)?
+    }
+
+    let channel = target.fetch_channel().await?;
+
+    if let Channel::Group {
+        id,
+        owner,
+        recipients,
+        ..
+    } = channel
+    {
+        if &user.id != &owner {
+            // figure out if we want to use perm system here
+            Err(Error::LabelMe)?
+        }
+
+        if recipients.iter().find(|x| *x == &member.id).is_none() {
+            Err(Error::NotInGroup)?
+        }
+
+        get_collection("channels")
+            .update_one(
+                doc! {
+                    "_id": &id
+                },
+                doc! {
+                    "$pull": {
+                        "recipients": &member.id
+                    }
+                },
+                None,
+            )
+            .await
+            .map_err(|_| Error::DatabaseError {
+                operation: "update_one",
+                with: "channel",
+            })?;
+
+        ClientboundNotification::ChannelGroupLeave {
+            id: id.clone(),
+            user: member.id.clone(),
+        }
+        .publish(id.clone())
+        .await
+        .ok();
+
+        Message::create(
+            "00000000000000000000000000".to_string(),
+            id,
+            format!("<@{}> removed <@{}> from the group.", user.id, member.id),
+        )
+        .publish()
+        .await
+        .ok();
+
+        Ok(())
+    } else {
+        Err(Error::InvalidOperation)
+    }
+}