Paginate the outbox responses. Fixes #669 (#681)

* Paginate the outbox responses. Fixes #669

* Address Ana's review

* Make outbox_fetch page through instance outboxes

* Fix infinite loop in fetch_outbox

* Fix off by one

src/routes/user.rs

@@ -1,4 +1,7 @@
-use activitypub::{activity::Create, collection::OrderedCollection};
+use activitypub::{
+    activity::Create,
+    collection::{OrderedCollection, OrderedCollectionPage},
+};
 use atom_syndication::{Entry, FeedBuilder};
 use diesel::SaveChangesDsl;
 use rocket::{
@@ -553,7 +556,15 @@ pub fn outbox(name: String, rockets: PlumeRocket) -> Option<ActivityStream<Order
     let user = User::find_by_fqn(&rockets, &name).ok()?;
     user.outbox(&*rockets.conn).ok()
 }
-
+#[get("/@/<name>/outbox?<page>")]
+pub fn outbox_page(
+    name: String,
+    page: Page,
+    rockets: PlumeRocket,
+) -> Option<ActivityStream<OrderedCollectionPage>> {
+    let user = User::find_by_fqn(&rockets, &name).ok()?;
+    user.outbox_page(&*rockets.conn, page.limits()).ok()
+}
 #[post("/@/<name>/inbox", data = "<data>")]
 pub fn inbox(
     name: String,