feat(channels): add / remove group members

src/routes/channels/group_add_member.rs

@@ -1,11 +1,23 @@
-use revolt_quark::{EmptyResponse, Result};
+use revolt_quark::{Error, EmptyResponse, Result, models::{User, Channel}, Ref, Db, perms, ChannelPermission};
 
 use mongodb::bson::doc;
 
 #[put("/<target>/recipients/<member>")]
 pub async fn req(
-    /*user: UserRef, target: Ref, member: Ref*/ target: String,
-    member: String,
+    db: &Db,
+    user: User, target: Ref, member: Ref
 ) -> Result<EmptyResponse> {
-    todo!()
+    let channel = target.as_channel(db).await?;
+    if !perms(&user).channel(&channel).calc_channel(db).await.get_invite_others() {
+        return Err(Error::MissingPermission { permission: ChannelPermission::InviteOthers as i32 })
+    }
+
+    match channel {
+        Channel::Group { id, .. } => {
+            let user = member.as_user(db).await?;
+            db.add_user_to_group(&id, &user.id).await?;
+            Ok(EmptyResponse)
+        }
+        _ => Err(Error::InvalidOperation)
+    }
 }