Improve peformance of search indexing, v2 fixes + new routes (#205)

* Refactor search to not spam the database with queries, new utility routes for V2

* Run prepare

src/routes/v1/users.rs

@@ -1,7 +1,7 @@
 use crate::auth::get_user_from_headers;
 use crate::database::models::User;
 use crate::models::ids::UserId;
-use crate::models::projects::ProjectStatus;
+use crate::models::projects::{ProjectId, ProjectStatus};
 use crate::routes::ApiError;
 use actix_web::web;
 use actix_web::{get, HttpRequest, HttpResponse};
@@ -42,3 +42,41 @@ pub async fn mods_list(
         Ok(HttpResponse::NotFound().body(""))
     }
 }
+
+#[get("{id}/follows")]
+pub async fn user_follows(
+    req: HttpRequest,
+    info: web::Path<(String,)>,
+    pool: web::Data<PgPool>,
+) -> Result<HttpResponse, ApiError> {
+    let user = get_user_from_headers(req.headers(), &**pool).await?;
+    let id_option =
+        crate::database::models::User::get_id_from_username_or_id(info.into_inner().0, &**pool)
+            .await?;
+
+    if let Some(id) = id_option {
+        if !user.role.is_mod() && user.id != id.into() {
+            return Err(ApiError::CustomAuthenticationError(
+                "You do not have permission to see the projects this user follows!".to_string(),
+            ));
+        }
+
+        use futures::TryStreamExt;
+
+        let projects: Vec<ProjectId> = sqlx::query!(
+            "
+            SELECT mf.mod_id FROM mod_follows mf
+            WHERE mf.follower_id = $1
+            ",
+            id as crate::database::models::ids::UserId,
+        )
+        .fetch_many(&**pool)
+        .try_filter_map(|e| async { Ok(e.right().map(|m| ProjectId(m.mod_id as u64))) })
+        .try_collect::<Vec<ProjectId>>()
+        .await?;
+
+        Ok(HttpResponse::Ok().json(projects))
+    } else {
+        Ok(HttpResponse::NotFound().body(""))
+    }
+}