crates/api_crud/src/community/create.rs

   1 use crate::PerformCrud;
   2 use activitypub_federation::core::signatures::generate_actor_keypair;
   3 use actix_web::web::Data;
   4 use lemmy_api_common::{
   5   community::{CommunityResponse, CreateCommunity},
   6   context::LemmyContext,
   7   utils::{
   8     generate_followers_url,
   9     generate_inbox_url,
  10     generate_local_apub_endpoint,
  11     generate_shared_inbox_url,
  12     get_local_user_view_from_jwt,
  13     is_admin,
  14     local_site_to_slur_regex,
  15     EndpointType,
  16   },
  17 };
  18 use lemmy_db_schema::{
  19   source::{
  20     actor_language::{CommunityLanguage, SiteLanguage},
  21     community::{
  22       Community,
  23       CommunityFollower,
  24       CommunityFollowerForm,
  25       CommunityInsertForm,
  26       CommunityModerator,
  27       CommunityModeratorForm,
  28     },
  29   },
  30   traits::{ApubActor, Crud, Followable, Joinable},
  31   utils::diesel_option_overwrite_to_url_create,
  32 };
  33 use lemmy_db_views::structs::SiteView;
  34 use lemmy_db_views_actor::structs::CommunityView;
  35 use lemmy_utils::{
  36   error::LemmyError,
  37   utils::{check_slurs, check_slurs_opt, is_valid_actor_name},
  38   ConnectionId,
  39 };
  40
  41 #[async_trait::async_trait(?Send)]
  42 impl PerformCrud for CreateCommunity {
  43   type Response = CommunityResponse;
  44
  45   #[tracing::instrument(skip(context, _websocket_id))]
  46   async fn perform(
  47     &self,
  48     context: &Data<LemmyContext>,
  49     _websocket_id: Option<ConnectionId>,
  50   ) -> Result<CommunityResponse, LemmyError> {
  51     let data: &CreateCommunity = self;
  52     let local_user_view =
  53       get_local_user_view_from_jwt(&data.auth, context.pool(), context.secret()).await?;
  54     let site_view = SiteView::read_local(context.pool()).await?;
  55     let local_site = site_view.local_site;
  56
  57     if local_site.community_creation_admin_only && is_admin(&local_user_view).is_err() {
  58       return Err(LemmyError::from_message(
  59         "only_admins_can_create_communities",
  60       ));
  61     }
  62
  63     // Check to make sure the icon and banners are urls
  64     let icon = diesel_option_overwrite_to_url_create(&data.icon)?;
  65     let banner = diesel_option_overwrite_to_url_create(&data.banner)?;
  66
  67     let slur_regex = local_site_to_slur_regex(&local_site);
  68     check_slurs(&data.name, &slur_regex)?;
  69     check_slurs(&data.title, &slur_regex)?;
  70     check_slurs_opt(&data.description, &slur_regex)?;
  71
  72     if !is_valid_actor_name(&data.name, local_site.actor_name_max_length as usize) {
  73       return Err(LemmyError::from_message("invalid_community_name"));
  74     }
  75
  76     // Double check for duplicate community actor_ids
  77     let community_actor_id = generate_local_apub_endpoint(
  78       EndpointType::Community,
  79       &data.name,
  80       &context.settings().get_protocol_and_hostname(),
  81     )?;
  82     let community_dupe = Community::read_from_apub_id(context.pool(), &community_actor_id).await?;
  83     if community_dupe.is_some() {
  84       return Err(LemmyError::from_message("community_already_exists"));
  85     }
  86
  87     // When you create a community, make sure the user becomes a moderator and a follower
  88     let keypair = generate_actor_keypair()?;
  89
  90     let community_form = CommunityInsertForm::builder()
  91       .name(data.name.clone())
  92       .title(data.title.clone())
  93       .description(data.description.clone())
  94       .icon(icon)
  95       .banner(banner)
  96       .nsfw(data.nsfw)
  97       .actor_id(Some(community_actor_id.clone()))
  98       .private_key(Some(keypair.private_key))
  99       .public_key(keypair.public_key)
 100       .followers_url(Some(generate_followers_url(&community_actor_id)?))
 101       .inbox_url(Some(generate_inbox_url(&community_actor_id)?))
 102       .shared_inbox_url(Some(generate_shared_inbox_url(&community_actor_id)?))
 103       .posting_restricted_to_mods(data.posting_restricted_to_mods)
 104       .instance_id(site_view.site.instance_id)
 105       .build();
 106
 107     let inserted_community = Community::create(context.pool(), &community_form)
 108       .await
 109       .map_err(|e| LemmyError::from_error_message(e, "community_already_exists"))?;
 110
 111     // The community creator becomes a moderator
 112     let community_moderator_form = CommunityModeratorForm {
 113       community_id: inserted_community.id,
 114       person_id: local_user_view.person.id,
 115     };
 116
 117     CommunityModerator::join(context.pool(), &community_moderator_form)
 118       .await
 119       .map_err(|e| LemmyError::from_error_message(e, "community_moderator_already_exists"))?;
 120
 121     // Follow your own community
 122     let community_follower_form = CommunityFollowerForm {
 123       community_id: inserted_community.id,
 124       person_id: local_user_view.person.id,
 125       pending: false,
 126     };
 127
 128     CommunityFollower::follow(context.pool(), &community_follower_form)
 129       .await
 130       .map_err(|e| LemmyError::from_error_message(e, "community_follower_already_exists"))?;
 131
 132     // Update the discussion_languages if that's provided
 133     let community_id = inserted_community.id;
 134     if let Some(languages) = data.discussion_languages.clone() {
 135       let site_languages = SiteLanguage::read_local(context.pool()).await?;
 136       // check that community languages are a subset of site languages
 137       // https://stackoverflow.com/a/64227550
 138       let is_subset = languages.iter().all(|item| site_languages.contains(item));
 139       if !is_subset {
 140         return Err(LemmyError::from_message("language_not_allowed"));
 141       }
 142       CommunityLanguage::update(context.pool(), languages, community_id).await?;
 143     }
 144
 145     let person_id = local_user_view.person.id;
 146     let community_view =
 147       CommunityView::read(context.pool(), inserted_community.id, Some(person_id)).await?;
 148     let discussion_languages =
 149       CommunityLanguage::read(context.pool(), inserted_community.id).await?;
 150
 151     Ok(CommunityResponse {
 152       community_view,
 153       discussion_languages,
 154     })
 155   }
 156 }