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/mentions.rs

@@ -0,0 +1,111 @@
+use activitypub::link;
+use diesel::{self, PgConnection, QueryDsl, RunQueryDsl, ExpressionMethods};
+
+use plume_common::activity_pub::inbox::Notify;
+use comments::Comment;
+use notifications::*;
+use posts::Post;
+use users::User;
+use schema::mentions;
+
+#[derive(Queryable, Identifiable, Serialize, Deserialize)]
+pub struct Mention {
+    pub id: i32,
+    pub mentioned_id: i32,
+    pub post_id: Option<i32>,
+    pub comment_id: Option<i32>,
+    pub ap_url: String // TODO: remove, since mentions don't have an AP URL actually, this field was added by mistake
+}
+
+#[derive(Insertable)]
+#[table_name = "mentions"]
+pub struct NewMention {
+    pub mentioned_id: i32,
+    pub post_id: Option<i32>,
+    pub comment_id: Option<i32>,
+    pub ap_url: String
+}
+
+impl Mention {
+    insert!(mentions, NewMention);
+    get!(mentions);
+    find_by!(mentions, find_by_ap_url, ap_url as String);
+    list_by!(mentions, list_for_user, mentioned_id as i32);
+    list_by!(mentions, list_for_post, post_id as i32);
+    list_by!(mentions, list_for_comment, comment_id as i32);
+
+    pub fn get_mentioned(&self, conn: &PgConnection) -> Option<User> {
+        User::get(conn, self.mentioned_id)
+    }
+
+    pub fn get_post(&self, conn: &PgConnection) -> Option<Post> {
+        self.post_id.and_then(|id| Post::get(conn, id))
+    }
+
+    pub fn get_comment(&self, conn: &PgConnection) -> Option<Comment> {
+        self.comment_id.and_then(|id| Comment::get(conn, id))
+    }
+
+    pub fn build_activity(conn: &PgConnection, ment: String) -> link::Mention {
+        let user = User::find_by_fqn(conn, ment.clone());
+        let mut mention = link::Mention::default();
+        mention.link_props.set_href_string(user.clone().map(|u| u.ap_url).unwrap_or(String::new())).expect("Error setting mention's href");
+        mention.link_props.set_name_string(format!("@{}", ment)).expect("Error setting mention's name");
+        mention
+    }
+
+    pub fn to_activity(&self, conn: &PgConnection) -> link::Mention {
+        let user = self.get_mentioned(conn);
+        let mut mention = link::Mention::default();
+        mention.link_props.set_href_string(user.clone().map(|u| u.ap_url).unwrap_or(String::new())).expect("Error setting mention's href");
+        mention.link_props.set_name_string(user.map(|u| format!("@{}", u.get_fqn(conn))).unwrap_or(String::new())).expect("Error setting mention's name");
+        mention
+    }
+
+    pub fn from_activity(conn: &PgConnection, ment: link::Mention, inside: i32, in_post: bool) -> Option<Self> {
+        let ap_url = ment.link_props.href_string().unwrap();
+        let mentioned = User::find_by_ap_url(conn, ap_url).unwrap();
+
+        if in_post {
+            Post::get(conn, inside.clone().into()).map(|post| {
+                let res = Mention::insert(conn, NewMention {
+                    mentioned_id: mentioned.id,
+                    post_id: Some(post.id),
+                    comment_id: None,
+                    ap_url: ment.link_props.href_string().unwrap_or(String::new())
+                });
+                res.notify(conn);
+                res
+            })
+        } else {
+            Comment::get(conn, inside.into()).map(|comment| {
+                let res = Mention::insert(conn, NewMention {
+                    mentioned_id: mentioned.id,
+                    post_id: None,
+                    comment_id: Some(comment.id),
+                    ap_url: ment.link_props.href_string().unwrap_or(String::new())
+                });
+                res.notify(conn);
+                res
+            })
+        }
+    }
+}
+
+impl Notify<PgConnection> for Mention {
+    fn notify(&self, conn: &PgConnection) {
+        let author = self.get_comment(conn)
+            .map(|c| c.get_author(conn).display_name.clone())
+            .unwrap_or_else(|| self.get_post(conn).unwrap().get_authors(conn)[0].display_name.clone());
+
+        self.get_mentioned(conn).map(|m| {
+            Notification::insert(conn, NewNotification {
+                title: "{{ data }} mentioned you.".to_string(),
+                data: Some(author),
+                content: None,
+                link: Some(self.get_post(conn).map(|p| p.ap_url).unwrap_or_else(|| self.get_comment(conn).unwrap().ap_url.unwrap_or(String::new()))),
+                user_id: m.id
+            });
+        });
+    }
+}