crates/api_crud/src/community/create.rs

   1 use crate::PerformCrud;
   2 use activitypub_federation::http_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     is_admin,
  13     local_site_to_slur_regex,
  14     local_user_view_from_jwt,
  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::{
  38     slurs::{check_slurs, check_slurs_opt},
  39     validation::{is_valid_actor_name, is_valid_body_field},
  40   },
  41   ConnectionId,
  42 };
  43
  44 #[async_trait::async_trait(?Send)]
  45 impl PerformCrud for CreateCommunity {
  46   type Response = CommunityResponse;
  47
  48   #[tracing::instrument(skip(context, _websocket_id))]
  49   async fn perform(
  50     &self,
  51     context: &Data<LemmyContext>,
  52     _websocket_id: Option<ConnectionId>,
  53   ) -> Result<CommunityResponse, LemmyError> {
  54     let data: &CreateCommunity = self;
  55     let local_user_view = local_user_view_from_jwt(&data.auth, context).await?;
  56     let site_view = SiteView::read_local(context.pool()).await?;
  57     let local_site = site_view.local_site;
  58
  59     if local_site.community_creation_admin_only && is_admin(&local_user_view).is_err() {
  60       return Err(LemmyError::from_message(
  61         "only_admins_can_create_communities",
  62       ));
  63     }
  64
  65     // Check to make sure the icon and banners are urls
  66     let icon = diesel_option_overwrite_to_url_create(&data.icon)?;
  67     let banner = diesel_option_overwrite_to_url_create(&data.banner)?;
  68
  69     let slur_regex = local_site_to_slur_regex(&local_site);
  70     check_slurs(&data.name, &slur_regex)?;
  71     check_slurs(&data.title, &slur_regex)?;
  72     check_slurs_opt(&data.description, &slur_regex)?;
  73
  74     is_valid_actor_name(&data.name, local_site.actor_name_max_length as usize)?;
  75     is_valid_body_field(&data.description)?;
  76
  77     // Double check for duplicate community actor_ids
  78     let community_actor_id = generate_local_apub_endpoint(
  79       EndpointType::Community,
  80       &data.name,
  81       &context.settings().get_protocol_and_hostname(),
  82     )?;
  83     let community_dupe = Community::read_from_apub_id(context.pool(), &community_actor_id).await?;
  84     if community_dupe.is_some() {
  85       return Err(LemmyError::from_message("community_already_exists"));
  86     }
  87
  88     // When you create a community, make sure the user becomes a moderator and a follower
  89     let keypair = generate_actor_keypair()?;
  90
  91     let community_form = CommunityInsertForm::builder()
  92       .name(data.name.clone())
  93       .title(data.title.clone())
  94       .description(data.description.clone())
  95       .icon(icon)
  96       .banner(banner)
  97       .nsfw(data.nsfw)
  98       .actor_id(Some(community_actor_id.clone()))
  99       .private_key(Some(keypair.private_key))
 100       .public_key(keypair.public_key)
 101       .followers_url(Some(generate_followers_url(&community_actor_id)?))
 102       .inbox_url(Some(generate_inbox_url(&community_actor_id)?))
 103       .shared_inbox_url(Some(generate_shared_inbox_url(&community_actor_id)?))
 104       .posting_restricted_to_mods(data.posting_restricted_to_mods)
 105       .instance_id(site_view.site.instance_id)
 106       .build();
 107
 108     let inserted_community = Community::create(context.pool(), &community_form)
 109       .await
 110       .map_err(|e| LemmyError::from_error_message(e, "community_already_exists"))?;
 111
 112     // The community creator becomes a moderator
 113     let community_moderator_form = CommunityModeratorForm {
 114       community_id: inserted_community.id,
 115       person_id: local_user_view.person.id,
 116     };
 117
 118     CommunityModerator::join(context.pool(), &community_moderator_form)
 119       .await
 120       .map_err(|e| LemmyError::from_error_message(e, "community_moderator_already_exists"))?;
 121
 122     // Follow your own community
 123     let community_follower_form = CommunityFollowerForm {
 124       community_id: inserted_community.id,
 125       person_id: local_user_view.person.id,
 126       pending: false,
 127     };
 128
 129     CommunityFollower::follow(context.pool(), &community_follower_form)
 130       .await
 131       .map_err(|e| LemmyError::from_error_message(e, "community_follower_already_exists"))?;
 132
 133     // Update the discussion_languages if that's provided
 134     let community_id = inserted_community.id;
 135     if let Some(languages) = data.discussion_languages.clone() {
 136       let site_languages = SiteLanguage::read_local_raw(context.pool()).await?;
 137       // check that community languages are a subset of site languages
 138       // https://stackoverflow.com/a/64227550
 139       let is_subset = languages.iter().all(|item| site_languages.contains(item));
 140       if !is_subset {
 141         return Err(LemmyError::from_message("language_not_allowed"));
 142       }
 143       CommunityLanguage::update(context.pool(), languages, community_id).await?;
 144     }
 145
 146     let person_id = local_user_view.person.id;
 147     let community_view =
 148       CommunityView::read(context.pool(), inserted_community.id, Some(person_id), None).await?;
 149     let discussion_languages =
 150       CommunityLanguage::read(context.pool(), inserted_community.id).await?;
 151
 152     Ok(CommunityResponse {
 153       community_view,
 154       discussion_languages,
 155     })
 156   }
 157 }