crates/db_views_actor/src/community_view.rs

   1 use crate::{community_moderator_view::CommunityModeratorView, person_view::PersonViewSafe};
   2 use diesel::{result::Error, *};
   3 use lemmy_db_schema::{
   4   aggregates::community_aggregates::CommunityAggregates,
   5   functions::hot_rank,
   6   fuzzy_search,
   7   limit_and_offset,
   8   newtypes::{CommunityId, PersonId},
   9   schema::{community, community_aggregates, community_block, community_follower},
  10   source::{
  11     community::{Community, CommunityFollower, CommunitySafe},
  12     community_block::CommunityBlock,
  13   },
  14   traits::{MaybeOptional, ToSafe, ViewToVec},
  15   ListingType,
  16   SortType,
  17 };
  18 use serde::{Deserialize, Serialize};
  19
  20 #[derive(Debug, Serialize, Deserialize, Clone)]
  21 pub struct CommunityView {
  22   pub community: CommunitySafe,
  23   pub subscribed: bool,
  24   pub blocked: bool,
  25   pub counts: CommunityAggregates,
  26 }
  27
  28 type CommunityViewTuple = (
  29   CommunitySafe,
  30   CommunityAggregates,
  31   Option<CommunityFollower>,
  32   Option<CommunityBlock>,
  33 );
  34
  35 impl CommunityView {
  36   pub fn read(
  37     conn: &PgConnection,
  38     community_id: CommunityId,
  39     my_person_id: Option<PersonId>,
  40   ) -> Result<Self, Error> {
  41     // The left join below will return None in this case
  42     let person_id_join = my_person_id.unwrap_or(PersonId(-1));
  43
  44     let (community, counts, follower, blocked) = community::table
  45       .find(community_id)
  46       .inner_join(community_aggregates::table)
  47       .left_join(
  48         community_follower::table.on(
  49           community::id
  50             .eq(community_follower::community_id)
  51             .and(community_follower::person_id.eq(person_id_join)),
  52         ),
  53       )
  54       .left_join(
  55         community_block::table.on(
  56           community::id
  57             .eq(community_block::community_id)
  58             .and(community_block::person_id.eq(person_id_join)),
  59         ),
  60       )
  61       .select((
  62         Community::safe_columns_tuple(),
  63         community_aggregates::all_columns,
  64         community_follower::all_columns.nullable(),
  65         community_block::all_columns.nullable(),
  66       ))
  67       .first::<CommunityViewTuple>(conn)?;
  68
  69     Ok(CommunityView {
  70       community,
  71       subscribed: follower.is_some(),
  72       blocked: blocked.is_some(),
  73       counts,
  74     })
  75   }
  76
  77   // TODO: this function is only used by is_mod_or_admin() below, can probably be merged
  78   fn community_mods_and_admins(
  79     conn: &PgConnection,
  80     community_id: CommunityId,
  81   ) -> Result<Vec<PersonId>, Error> {
  82     let mut mods_and_admins: Vec<PersonId> = Vec::new();
  83     mods_and_admins.append(
  84       &mut CommunityModeratorView::for_community(conn, community_id)
  85         .map(|v| v.into_iter().map(|m| m.moderator.id).collect())?,
  86     );
  87     mods_and_admins.append(
  88       &mut PersonViewSafe::admins(conn).map(|v| v.into_iter().map(|a| a.person.id).collect())?,
  89     );
  90     Ok(mods_and_admins)
  91   }
  92
  93   pub fn is_mod_or_admin(
  94     conn: &PgConnection,
  95     person_id: PersonId,
  96     community_id: CommunityId,
  97   ) -> bool {
  98     Self::community_mods_and_admins(conn, community_id)
  99       .unwrap_or_default()
 100       .contains(&person_id)
 101   }
 102 }
 103
 104 pub struct CommunityQueryBuilder<'a> {
 105   conn: &'a PgConnection,
 106   listing_type: Option<ListingType>,
 107   sort: Option<SortType>,
 108   my_person_id: Option<PersonId>,
 109   show_nsfw: Option<bool>,
 110   search_term: Option<String>,
 111   page: Option<i64>,
 112   limit: Option<i64>,
 113 }
 114
 115 impl<'a> CommunityQueryBuilder<'a> {
 116   pub fn create(conn: &'a PgConnection) -> Self {
 117     CommunityQueryBuilder {
 118       conn,
 119       my_person_id: None,
 120       listing_type: None,
 121       sort: None,
 122       show_nsfw: None,
 123       search_term: None,
 124       page: None,
 125       limit: None,
 126     }
 127   }
 128
 129   pub fn listing_type<T: MaybeOptional<ListingType>>(mut self, listing_type: T) -> Self {
 130     self.listing_type = listing_type.get_optional();
 131     self
 132   }
 133
 134   pub fn sort<T: MaybeOptional<SortType>>(mut self, sort: T) -> Self {
 135     self.sort = sort.get_optional();
 136     self
 137   }
 138
 139   pub fn show_nsfw<T: MaybeOptional<bool>>(mut self, show_nsfw: T) -> Self {
 140     self.show_nsfw = show_nsfw.get_optional();
 141     self
 142   }
 143
 144   pub fn search_term<T: MaybeOptional<String>>(mut self, search_term: T) -> Self {
 145     self.search_term = search_term.get_optional();
 146     self
 147   }
 148
 149   pub fn my_person_id<T: MaybeOptional<PersonId>>(mut self, my_person_id: T) -> Self {
 150     self.my_person_id = my_person_id.get_optional();
 151     self
 152   }
 153
 154   pub fn page<T: MaybeOptional<i64>>(mut self, page: T) -> Self {
 155     self.page = page.get_optional();
 156     self
 157   }
 158
 159   pub fn limit<T: MaybeOptional<i64>>(mut self, limit: T) -> Self {
 160     self.limit = limit.get_optional();
 161     self
 162   }
 163
 164   pub fn list(self) -> Result<Vec<CommunityView>, Error> {
 165     // The left join below will return None in this case
 166     let person_id_join = self.my_person_id.unwrap_or(PersonId(-1));
 167
 168     let mut query = community::table
 169       .inner_join(community_aggregates::table)
 170       .left_join(
 171         community_follower::table.on(
 172           community::id
 173             .eq(community_follower::community_id)
 174             .and(community_follower::person_id.eq(person_id_join)),
 175         ),
 176       )
 177       .left_join(
 178         community_block::table.on(
 179           community::id
 180             .eq(community_block::community_id)
 181             .and(community_block::person_id.eq(person_id_join)),
 182         ),
 183       )
 184       .select((
 185         Community::safe_columns_tuple(),
 186         community_aggregates::all_columns,
 187         community_follower::all_columns.nullable(),
 188         community_block::all_columns.nullable(),
 189       ))
 190       .into_boxed();
 191
 192     if let Some(search_term) = self.search_term {
 193       let searcher = fuzzy_search(&search_term);
 194       query = query
 195         .filter(community::name.ilike(searcher.to_owned()))
 196         .or_filter(community::title.ilike(searcher.to_owned()))
 197         .or_filter(community::description.ilike(searcher));
 198     };
 199
 200     match self.sort.unwrap_or(SortType::Hot) {
 201       SortType::New => query = query.order_by(community::published.desc()),
 202       SortType::TopAll => query = query.order_by(community_aggregates::subscribers.desc()),
 203       SortType::TopMonth => query = query.order_by(community_aggregates::users_active_month.desc()),
 204       // Covers all other sorts, including hot
 205       _ => {
 206         query = query
 207           .order_by(
 208             hot_rank(
 209               community_aggregates::subscribers,
 210               community_aggregates::published,
 211             )
 212             .desc(),
 213           )
 214           .then_order_by(community_aggregates::published.desc())
 215       }
 216     };
 217
 218     if !self.show_nsfw.unwrap_or(false) {
 219       query = query.filter(community::nsfw.eq(false));
 220     };
 221
 222     if let Some(listing_type) = self.listing_type {
 223       query = match listing_type {
 224         ListingType::Subscribed => query.filter(community_follower::person_id.is_not_null()), // TODO could be this: and(community_follower::person_id.eq(person_id_join)),
 225         ListingType::Local => query.filter(community::local.eq(true)),
 226         _ => query,
 227       };
 228     }
 229
 230     // Don't show blocked communities
 231     if self.my_person_id.is_some() {
 232       query = query.filter(community_block::person_id.is_null());
 233     }
 234
 235     let (limit, offset) = limit_and_offset(self.page, self.limit);
 236     let res = query
 237       .limit(limit)
 238       .offset(offset)
 239       .filter(community::removed.eq(false))
 240       .filter(community::deleted.eq(false))
 241       .load::<CommunityViewTuple>(self.conn)?;
 242
 243     Ok(CommunityView::from_tuple_to_vec(res))
 244   }
 245 }
 246
 247 impl ViewToVec for CommunityView {
 248   type DbTuple = CommunityViewTuple;
 249   fn from_tuple_to_vec(items: Vec<Self::DbTuple>) -> Vec<Self> {
 250     items
 251       .iter()
 252       .map(|a| Self {
 253         community: a.0.to_owned(),
 254         counts: a.1.to_owned(),
 255         subscribed: a.2.is_some(),
 256         blocked: a.3.is_some(),
 257       })
 258       .collect::<Vec<Self>>()
 259   }
 260 }