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/likes.rs

@@ -0,0 +1,116 @@
+use activitypub::activity;
+use chrono;
+use diesel::{self, PgConnection, QueryDsl, RunQueryDsl, ExpressionMethods};
+
+use plume_common::activity_pub::{
+    PUBLIC_VISIBILTY,
+    Id,
+    IntoId,
+    inbox::{FromActivity, Deletable, Notify}
+};
+use notifications::*;
+use posts::Post;
+use users::User;
+use schema::likes;
+
+#[derive(Queryable, Identifiable)]
+pub struct Like {
+    pub id: i32,
+    pub user_id: i32,
+    pub post_id: i32,
+    pub creation_date: chrono::NaiveDateTime,
+    pub ap_url: String
+}
+
+#[derive(Default, Insertable)]
+#[table_name = "likes"]
+pub struct NewLike {
+    pub user_id: i32,
+    pub post_id: i32,
+    pub ap_url: String
+}
+
+impl Like {
+    insert!(likes, NewLike);
+    get!(likes);
+    find_by!(likes, find_by_ap_url, ap_url as String);
+    find_by!(likes, 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(likes::ap_url.eq(format!(
+                    "{}/like/{}",
+                    User::get(conn, self.user_id).unwrap().ap_url,
+                    Post::get(conn, self.post_id).unwrap().ap_url
+                )))
+                .get_result::<Like>(conn).expect("Couldn't update AP URL");
+        }
+    }
+
+    pub fn delete(&self, conn: &PgConnection) -> activity::Undo {
+        diesel::delete(self).execute(conn).unwrap();
+
+        let mut act = activity::Undo::default();
+        act.undo_props.set_actor_link(User::get(conn, self.user_id).unwrap().into_id()).expect("Like::delete: actor error");
+        act.undo_props.set_object_object(self.into_activity(conn)).expect("Like::delete: object error");
+        act.object_props.set_id_string(format!("{}#delete", self.ap_url)).expect("Like::delete: id error");
+        act.object_props.set_to_link(Id::new(PUBLIC_VISIBILTY.to_string())).expect("Like::delete: to error");
+        act.object_props.set_cc_link_vec::<Id>(vec![]).expect("Like::delete: cc error");
+
+        act
+    }
+
+    pub fn into_activity(&self, conn: &PgConnection) -> activity::Like {
+        let mut act = activity::Like::default();
+        act.like_props.set_actor_link(User::get(conn, self.user_id).unwrap().into_id()).expect("Like::into_activity: actor error");
+        act.like_props.set_object_link(Post::get(conn, self.post_id).unwrap().into_id()).expect("Like::into_activity: object error");
+        act.object_props.set_to_link(Id::new(PUBLIC_VISIBILTY.to_string())).expect("Like::into_activity: to error");
+        act.object_props.set_cc_link_vec::<Id>(vec![]).expect("Like::into_activity: cc error");
+        act.object_props.set_id_string(self.ap_url.clone()).expect("Like::into_activity: id error");
+
+        act
+    }
+}
+
+impl FromActivity<activity::Like, PgConnection> for Like {
+    fn from_activity(conn: &PgConnection, like: activity::Like, _actor: Id) -> Like {
+        let liker = User::from_url(conn, like.like_props.actor.as_str().unwrap().to_string());
+        let post = Post::find_by_ap_url(conn, like.like_props.object.as_str().unwrap().to_string());
+        let res = Like::insert(conn, NewLike {
+            post_id: post.unwrap().id,
+            user_id: liker.unwrap().id,
+            ap_url: like.object_props.id_string().unwrap_or(String::from(""))
+        });
+        res.notify(conn);
+        res
+    }
+}
+
+impl Notify<PgConnection> for Like {
+    fn notify(&self, conn: &PgConnection) {
+        let liker = User::get(conn, self.user_id).unwrap();
+        let post = Post::get(conn, self.post_id).unwrap();
+        for author in post.get_authors(conn) {
+            let post = post.clone();
+            Notification::insert(conn, NewNotification {
+                title: "{{ data }} liked your article".to_string(),
+                data: Some(liker.display_name.clone()),
+                content: Some(post.title),
+                link: Some(post.ap_url),
+                user_id: author.id
+            });
+        }
+    }
+}
+
+impl Deletable<PgConnection> for Like {
+    fn delete_activity(conn: &PgConnection, id: Id) -> bool {
+        if let Some(like) = Like::find_by_ap_url(conn, id.into()) {
+            like.delete(conn);
+            true
+        } else {
+            false
+        }
+    }
+}