crates/db_views_actor/src/community_view.rs

   1 use crate::structs::{CommunityModeratorView, CommunityView, PersonView};
   2 use diesel::{
   3   result::Error,
   4   BoolExpressionMethods,
   5   ExpressionMethods,
   6   JoinOnDsl,
   7   NullableExpressionMethods,
   8   PgTextExpressionMethods,
   9   QueryDsl,
  10 };
  11 use diesel_async::RunQueryDsl;
  12 use lemmy_db_schema::{
  13   aggregates::structs::CommunityAggregates,
  14   newtypes::{CommunityId, PersonId},
  15   schema::{community, community_aggregates, community_block, community_follower, local_user},
  16   source::{
  17     community::{Community, CommunityFollower},
  18     community_block::CommunityBlock,
  19     local_user::LocalUser,
  20   },
  21   traits::JoinView,
  22   utils::{fuzzy_search, get_conn, limit_and_offset, DbPool},
  23   ListingType,
  24   SortType,
  25 };
  26 use typed_builder::TypedBuilder;
  27
  28 type CommunityViewTuple = (
  29   Community,
  30   CommunityAggregates,
  31   Option<CommunityFollower>,
  32   Option<CommunityBlock>,
  33 );
  34
  35 impl CommunityView {
  36   pub async fn read(
  37     pool: &DbPool,
  38     community_id: CommunityId,
  39     my_person_id: Option<PersonId>,
  40     is_mod_or_admin: Option<bool>,
  41   ) -> Result<Self, Error> {
  42     let conn = &mut get_conn(pool).await?;
  43     // The left join below will return None in this case
  44     let person_id_join = my_person_id.unwrap_or(PersonId(-1));
  45
  46     let mut query = community::table
  47       .find(community_id)
  48       .inner_join(community_aggregates::table)
  49       .left_join(
  50         community_follower::table.on(
  51           community::id
  52             .eq(community_follower::community_id)
  53             .and(community_follower::person_id.eq(person_id_join)),
  54         ),
  55       )
  56       .left_join(
  57         community_block::table.on(
  58           community::id
  59             .eq(community_block::community_id)
  60             .and(community_block::person_id.eq(person_id_join)),
  61         ),
  62       )
  63       .select((
  64         community::all_columns,
  65         community_aggregates::all_columns,
  66         community_follower::all_columns.nullable(),
  67         community_block::all_columns.nullable(),
  68       ))
  69       .into_boxed();
  70
  71     // Hide deleted and removed for non-admins or mods
  72     if !is_mod_or_admin.unwrap_or(true) {
  73       query = query
  74         .filter(community::removed.eq(false))
  75         .filter(community::deleted.eq(false));
  76     }
  77
  78     let (community, counts, follower, blocked) = query.first::<CommunityViewTuple>(conn).await?;
  79
  80     Ok(CommunityView {
  81       community,
  82       subscribed: CommunityFollower::to_subscribed_type(&follower),
  83       blocked: blocked.is_some(),
  84       counts,
  85     })
  86   }
  87
  88   pub async fn is_mod_or_admin(
  89     pool: &DbPool,
  90     person_id: PersonId,
  91     community_id: CommunityId,
  92   ) -> Result<bool, Error> {
  93     let is_mod = CommunityModeratorView::for_community(pool, community_id)
  94       .await
  95       .map(|v| {
  96         v.into_iter()
  97           .map(|m| m.moderator.id)
  98           .collect::<Vec<PersonId>>()
  99       })
 100       .unwrap_or_default()
 101       .contains(&person_id);
 102     if is_mod {
 103       return Ok(true);
 104     }
 105
 106     let is_admin = PersonView::admins(pool)
 107       .await
 108       .map(|v| {
 109         v.into_iter()
 110           .map(|a| a.person.id)
 111           .collect::<Vec<PersonId>>()
 112       })
 113       .unwrap_or_default()
 114       .contains(&person_id);
 115     Ok(is_admin)
 116   }
 117 }
 118
 119 #[derive(TypedBuilder)]
 120 #[builder(field_defaults(default))]
 121 pub struct CommunityQuery<'a> {
 122   #[builder(!default)]
 123   pool: &'a DbPool,
 124   listing_type: Option<ListingType>,
 125   sort: Option<SortType>,
 126   local_user: Option<&'a LocalUser>,
 127   search_term: Option<String>,
 128   is_mod_or_admin: Option<bool>,
 129   page: Option<i64>,
 130   limit: Option<i64>,
 131 }
 132
 133 impl<'a> CommunityQuery<'a> {
 134   pub async fn list(self) -> Result<Vec<CommunityView>, Error> {
 135     let conn = &mut get_conn(self.pool).await?;
 136
 137     // The left join below will return None in this case
 138     let person_id_join = self.local_user.map(|l| l.person_id).unwrap_or(PersonId(-1));
 139
 140     let mut query = community::table
 141       .inner_join(community_aggregates::table)
 142       .left_join(local_user::table.on(local_user::person_id.eq(person_id_join)))
 143       .left_join(
 144         community_follower::table.on(
 145           community::id
 146             .eq(community_follower::community_id)
 147             .and(community_follower::person_id.eq(person_id_join)),
 148         ),
 149       )
 150       .left_join(
 151         community_block::table.on(
 152           community::id
 153             .eq(community_block::community_id)
 154             .and(community_block::person_id.eq(person_id_join)),
 155         ),
 156       )
 157       .select((
 158         community::all_columns,
 159         community_aggregates::all_columns,
 160         community_follower::all_columns.nullable(),
 161         community_block::all_columns.nullable(),
 162       ))
 163       .into_boxed();
 164
 165     if let Some(search_term) = self.search_term {
 166       let searcher = fuzzy_search(&search_term);
 167       query = query
 168         .filter(community::name.ilike(searcher.clone()))
 169         .or_filter(community::title.ilike(searcher));
 170     };
 171
 172     // Hide deleted and removed for non-admins or mods
 173     if !self.is_mod_or_admin.unwrap_or(true) {
 174       query = query
 175         .filter(community::removed.eq(false))
 176         .filter(community::deleted.eq(false));
 177     }
 178
 179     match self.sort.unwrap_or(SortType::Hot) {
 180       SortType::New => query = query.order_by(community::published.desc()),
 181       SortType::TopAll => query = query.order_by(community_aggregates::subscribers.desc()),
 182       SortType::TopMonth => query = query.order_by(community_aggregates::users_active_month.desc()),
 183       SortType::Hot => {
 184         query = query.order_by(community_aggregates::users_active_month.desc());
 185         // Don't show hidden communities in Hot (trending)
 186         query = query.filter(
 187           community::hidden
 188             .eq(false)
 189             .or(community_follower::person_id.eq(person_id_join)),
 190         );
 191       }
 192       // Covers all other sorts
 193       _ => query = query.order_by(community_aggregates::users_active_month.desc()),
 194     };
 195
 196     if let Some(listing_type) = self.listing_type {
 197       query = match listing_type {
 198         ListingType::Subscribed => query.filter(community_follower::person_id.is_not_null()), // TODO could be this: and(community_follower::person_id.eq(person_id_join)),
 199         ListingType::Local => query.filter(community::local.eq(true)),
 200         _ => query,
 201       };
 202     }
 203
 204     // Don't show blocked communities or nsfw communities if not enabled in profile
 205     if self.local_user.is_some() {
 206       query = query.filter(community_block::person_id.is_null());
 207       query = query.filter(community::nsfw.eq(false).or(local_user::show_nsfw.eq(true)));
 208     } else {
 209       // No person in request, only show nsfw communities if show_nsfw passed into request
 210       if !self.local_user.map(|l| l.show_nsfw).unwrap_or(false) {
 211         query = query.filter(community::nsfw.eq(false));
 212       }
 213     }
 214
 215     let (limit, offset) = limit_and_offset(self.page, self.limit)?;
 216     let res = query
 217       .limit(limit)
 218       .offset(offset)
 219       .filter(community::removed.eq(false))
 220       .filter(community::deleted.eq(false))
 221       .load::<CommunityViewTuple>(conn)
 222       .await?;
 223
 224     Ok(res.into_iter().map(CommunityView::from_tuple).collect())
 225   }
 226 }
 227
 228 impl JoinView for CommunityView {
 229   type JoinTuple = CommunityViewTuple;
 230   fn from_tuple(a: Self::JoinTuple) -> Self {
 231     Self {
 232       community: a.0,
 233       counts: a.1,
 234       subscribed: CommunityFollower::to_subscribed_type(&a.2),
 235       blocked: a.3.is_some(),
 236     }
 237   }
 238 }