Big repository reorganization

The code is divided in three crates:
- plume-common, for the ActivityPub module, and some common utils
- plume-models, for the models and database-related code
- plume, the app itself

This new organization will allow to test it more easily, but also to create other tools that only reuse a little part of
the code (for instance a Wordpress import tool, that would just use the plume-models crate)

plume-models/src/reshares.rs

@@ -0,0 +1,123 @@
+use activitypub::activity::{Announce, Undo};
+use chrono::NaiveDateTime;
+use diesel::{self, PgConnection, QueryDsl, RunQueryDsl, ExpressionMethods};
+
+use plume_common::activity_pub::{Id, IntoId, inbox::{FromActivity, Notify, Deletable}, PUBLIC_VISIBILTY};
+use notifications::*;
+use posts::Post;
+use  users::User;
+use schema::reshares;
+
+#[derive(Serialize, Deserialize, Queryable, Identifiable)]
+pub struct Reshare {
+    pub id: i32,
+    pub user_id: i32,
+    pub post_id: i32,
+    pub ap_url: String,
+    pub creation_date: NaiveDateTime
+}
+
+#[derive(Insertable)]
+#[table_name = "reshares"]
+pub struct NewReshare {
+    pub user_id: i32,
+    pub post_id: i32,
+    pub ap_url: String
+}
+
+impl Reshare {
+    insert!(reshares, NewReshare);
+    get!(reshares);
+    find_by!(reshares, find_by_ap_url, ap_url as String);
+    find_by!(reshares, find_by_user_on_post, user_id as i32, post_id as i32);
+
+    pub fn update_ap_url(&self, conn: &PgConnection) {
+        if self.ap_url.len() == 0 {
+            diesel::update(self)
+                .set(reshares::ap_url.eq(format!(
+                    "{}/reshare/{}",
+                    User::get(conn, self.user_id).unwrap().ap_url,
+                    Post::get(conn, self.post_id).unwrap().ap_url
+                )))
+                .get_result::<Reshare>(conn).expect("Couldn't update AP URL");
+        }
+    }
+
+    pub fn get_recents_for_author(conn: &PgConnection, user: &User, limit: i64) -> Vec<Reshare> {
+        reshares::table.filter(reshares::user_id.eq(user.id))
+            .order(reshares::creation_date.desc())
+            .limit(limit)
+            .load::<Reshare>(conn)
+            .expect("Error loading recent reshares for user")
+    }
+
+    pub fn get_post(&self, conn: &PgConnection) -> Option<Post> {
+        Post::get(conn, self.post_id)
+    }
+
+    pub fn delete(&self, conn: &PgConnection) -> Undo {
+        diesel::delete(self).execute(conn).unwrap();
+
+        let mut act = Undo::default();
+        act.undo_props.set_actor_link(User::get(conn, self.user_id).unwrap().into_id()).unwrap();
+        act.undo_props.set_object_object(self.into_activity(conn)).unwrap();
+        act.object_props.set_id_string(format!("{}#delete", self.ap_url)).expect("Reshare::delete: id error");
+        act.object_props.set_to_link(Id::new(PUBLIC_VISIBILTY.to_string())).expect("Reshare::delete: to error");
+        act.object_props.set_cc_link_vec::<Id>(vec![]).expect("Reshare::delete: cc error");
+
+        act
+    }
+
+    pub fn into_activity(&self, conn: &PgConnection) -> Announce {
+        let mut act = Announce::default();
+        act.announce_props.set_actor_link(User::get(conn, self.user_id).unwrap().into_id()).unwrap();
+        act.announce_props.set_object_link(Post::get(conn, self.post_id).unwrap().into_id()).unwrap();
+        act.object_props.set_id_string(self.ap_url.clone()).unwrap();
+        act.object_props.set_to_link(Id::new(PUBLIC_VISIBILTY.to_string())).expect("Reshare::into_activity: to error");
+        act.object_props.set_cc_link_vec::<Id>(vec![]).expect("Reshare::into_activity: cc error");
+
+        act
+    }
+}
+
+impl FromActivity<Announce, PgConnection> for Reshare {
+    fn from_activity(conn: &PgConnection, announce: Announce, _actor: Id) -> Reshare {
+        let user = User::from_url(conn, announce.announce_props.actor.as_str().unwrap().to_string());
+        let post = Post::find_by_ap_url(conn, announce.announce_props.object.as_str().unwrap().to_string());
+        let reshare = Reshare::insert(conn, NewReshare {
+            post_id: post.unwrap().id,
+            user_id: user.unwrap().id,
+            ap_url: announce.object_props.id_string().unwrap_or(String::from(""))
+        });
+        reshare.notify(conn);
+        reshare
+    }
+}
+
+impl Notify<PgConnection> for Reshare {
+    fn notify(&self, conn: &PgConnection) {
+        let actor = User::get(conn, self.user_id).unwrap();
+        let post = self.get_post(conn).unwrap();
+        for author in post.get_authors(conn) {
+            let post = post.clone();
+            Notification::insert(conn, NewNotification {
+                title: "{{ data }} reshared your article".to_string(),
+                data: Some(actor.display_name.clone()),
+                content: Some(post.title),
+                link: Some(post.ap_url),
+                user_id: author.id
+            });
+        }
+    }
+}
+
+impl Deletable<PgConnection> for Reshare {
+    fn delete_activity(conn: &PgConnection, id: Id) -> bool {
+        if let Some(reshare) = Reshare::find_by_ap_url(conn, id.into()) {
+            reshare.delete(conn);
+            true
+        } else {
+            false
+        }
+    }
+}