use crate::{community_moderator_view::CommunityModeratorView, person_view::PersonViewSafe}; use diesel::{result::Error, *}; use lemmy_db_schema::{ aggregates::community_aggregates::CommunityAggregates, functions::hot_rank, fuzzy_search, limit_and_offset, newtypes::{CommunityId, PersonId}, schema::{community, community_aggregates, community_block, community_follower, local_user}, source::{ community::{Community, CommunityFollower, CommunitySafe}, community_block::CommunityBlock, }, traits::{MaybeOptional, ToSafe, ViewToVec}, ListingType, SortType, }; use serde::{Deserialize, Serialize}; #[derive(Debug, Serialize, Deserialize, Clone)] pub struct CommunityView { pub community: CommunitySafe, pub subscribed: bool, pub blocked: bool, pub counts: CommunityAggregates, } type CommunityViewTuple = ( CommunitySafe, CommunityAggregates, Option, Option, ); impl CommunityView { pub fn read( conn: &PgConnection, community_id: CommunityId, my_person_id: Option, ) -> Result { // The left join below will return None in this case let person_id_join = my_person_id.unwrap_or(PersonId(-1)); let (community, counts, follower, blocked) = community::table .find(community_id) .inner_join(community_aggregates::table) .left_join( community_follower::table.on( community::id .eq(community_follower::community_id) .and(community_follower::person_id.eq(person_id_join)), ), ) .left_join( community_block::table.on( community::id .eq(community_block::community_id) .and(community_block::person_id.eq(person_id_join)), ), ) .select(( Community::safe_columns_tuple(), community_aggregates::all_columns, community_follower::all_columns.nullable(), community_block::all_columns.nullable(), )) .first::(conn)?; Ok(CommunityView { community, subscribed: follower.is_some(), blocked: blocked.is_some(), counts, }) } pub fn is_mod_or_admin( conn: &PgConnection, person_id: PersonId, community_id: CommunityId, ) -> bool { let is_mod = CommunityModeratorView::for_community(conn, community_id) .map(|v| { v.into_iter() .map(|m| m.moderator.id) .collect::>() }) .unwrap_or_default() .contains(&person_id); if is_mod { return true; } PersonViewSafe::admins(conn) .map(|v| { v.into_iter() .map(|a| a.person.id) .collect::>() }) .unwrap_or_default() .contains(&person_id) } } pub struct CommunityQueryBuilder<'a> { conn: &'a PgConnection, listing_type: Option, sort: Option, my_person_id: Option, show_nsfw: Option, search_term: Option, page: Option, limit: Option, } impl<'a> CommunityQueryBuilder<'a> { pub fn create(conn: &'a PgConnection) -> Self { CommunityQueryBuilder { conn, my_person_id: None, listing_type: None, sort: None, show_nsfw: None, search_term: None, page: None, limit: None, } } pub fn listing_type>(mut self, listing_type: T) -> Self { self.listing_type = listing_type.get_optional(); self } pub fn sort>(mut self, sort: T) -> Self { self.sort = sort.get_optional(); self } pub fn show_nsfw>(mut self, show_nsfw: T) -> Self { self.show_nsfw = show_nsfw.get_optional(); self } pub fn search_term>(mut self, search_term: T) -> Self { self.search_term = search_term.get_optional(); self } pub fn my_person_id>(mut self, my_person_id: T) -> Self { self.my_person_id = my_person_id.get_optional(); self } pub fn page>(mut self, page: T) -> Self { self.page = page.get_optional(); self } pub fn limit>(mut self, limit: T) -> Self { self.limit = limit.get_optional(); self } pub fn list(self) -> Result, Error> { // The left join below will return None in this case let person_id_join = self.my_person_id.unwrap_or(PersonId(-1)); let mut query = community::table .inner_join(community_aggregates::table) .left_join(local_user::table.on(local_user::person_id.eq(person_id_join))) .left_join( community_follower::table.on( community::id .eq(community_follower::community_id) .and(community_follower::person_id.eq(person_id_join)), ), ) .left_join( community_block::table.on( community::id .eq(community_block::community_id) .and(community_block::person_id.eq(person_id_join)), ), ) .select(( Community::safe_columns_tuple(), community_aggregates::all_columns, community_follower::all_columns.nullable(), community_block::all_columns.nullable(), )) .into_boxed(); if let Some(search_term) = self.search_term { let searcher = fuzzy_search(&search_term); query = query .filter(community::name.ilike(searcher.to_owned())) .or_filter(community::title.ilike(searcher.to_owned())) .or_filter(community::description.ilike(searcher)); }; match self.sort.unwrap_or(SortType::Hot) { SortType::New => query = query.order_by(community::published.desc()), SortType::TopAll => query = query.order_by(community_aggregates::subscribers.desc()), SortType::TopMonth => query = query.order_by(community_aggregates::users_active_month.desc()), SortType::Hot => { query = query .order_by( hot_rank( community_aggregates::subscribers, community_aggregates::published, ) .desc(), ) .then_order_by(community_aggregates::published.desc()); // Don't show hidden communities in Hot (trending) query = query.filter( community::hidden .eq(false) .or(community_follower::person_id.eq(person_id_join)), ); } // Covers all other sorts _ => { query = query .order_by( hot_rank( community_aggregates::subscribers, community_aggregates::published, ) .desc(), ) .then_order_by(community_aggregates::published.desc()) } }; if let Some(listing_type) = self.listing_type { query = match listing_type { ListingType::Subscribed => query.filter(community_follower::person_id.is_not_null()), // TODO could be this: and(community_follower::person_id.eq(person_id_join)), ListingType::Local => query.filter(community::local.eq(true)), _ => query, }; } // Don't show blocked communities or nsfw communities if not enabled in profile if self.my_person_id.is_some() { query = query.filter(community_block::person_id.is_null()); query = query.filter(community::nsfw.eq(false).or(local_user::show_nsfw.eq(true))); } else { // No person in request, only show nsfw communities if show_nsfw passed into request if !self.show_nsfw.unwrap_or(false) { query = query.filter(community::nsfw.eq(false)); } } let (limit, offset) = limit_and_offset(self.page, self.limit); let res = query .limit(limit) .offset(offset) .filter(community::removed.eq(false)) .filter(community::deleted.eq(false)) .load::(self.conn)?; Ok(CommunityView::from_tuple_to_vec(res)) } } impl ViewToVec for CommunityView { type DbTuple = CommunityViewTuple; fn from_tuple_to_vec(items: Vec) -> Vec { items .iter() .map(|a| Self { community: a.0.to_owned(), counts: a.1.to_owned(), subscribed: a.2.is_some(), blocked: a.3.is_some(), }) .collect::>() } }