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     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::{
  38     slurs::{check_slurs, check_slurs_opt},
  39     validation::is_valid_actor_name,
  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 =
  56       get_local_user_view_from_jwt(&data.auth, context.pool(), context.secret()).await?;
  57     let site_view = SiteView::read_local(context.pool()).await?;
  58     let local_site = site_view.local_site;
  59
  60     if local_site.community_creation_admin_only && is_admin(&local_user_view).is_err() {
  61       return Err(LemmyError::from_message(
  62         "only_admins_can_create_communities",
  63       ));
  64     }
  65
  66     // Check to make sure the icon and banners are urls
  67     let icon = diesel_option_overwrite_to_url_create(&data.icon)?;
  68     let banner = diesel_option_overwrite_to_url_create(&data.banner)?;
  69
  70     let slur_regex = local_site_to_slur_regex(&local_site);
  71     check_slurs(&data.name, &slur_regex)?;
  72     check_slurs(&data.title, &slur_regex)?;
  73     check_slurs_opt(&data.description, &slur_regex)?;
  74
  75     if !is_valid_actor_name(&data.name, local_site.actor_name_max_length as usize) {
  76       return Err(LemmyError::from_message("invalid_community_name"));
  77     }
  78
  79     // Double check for duplicate community actor_ids
  80     let community_actor_id = generate_local_apub_endpoint(
  81       EndpointType::Community,
  82       &data.name,
  83       &context.settings().get_protocol_and_hostname(),
  84     )?;
  85     let community_dupe = Community::read_from_apub_id(context.pool(), &community_actor_id).await?;
  86     if community_dupe.is_some() {
  87       return Err(LemmyError::from_message("community_already_exists"));
  88     }
  89
  90     // When you create a community, make sure the user becomes a moderator and a follower
  91     let keypair = generate_actor_keypair()?;
  92
  93     let community_form = CommunityInsertForm::builder()
  94       .name(data.name.clone())
  95       .title(data.title.clone())
  96       .description(data.description.clone())
  97       .icon(icon)
  98       .banner(banner)
  99       .nsfw(data.nsfw)
 100       .actor_id(Some(community_actor_id.clone()))
 101       .private_key(Some(keypair.private_key))
 102       .public_key(keypair.public_key)
 103       .followers_url(Some(generate_followers_url(&community_actor_id)?))
 104       .inbox_url(Some(generate_inbox_url(&community_actor_id)?))
 105       .shared_inbox_url(Some(generate_shared_inbox_url(&community_actor_id)?))
 106       .posting_restricted_to_mods(data.posting_restricted_to_mods)
 107       .instance_id(site_view.site.instance_id)
 108       .build();
 109
 110     let inserted_community = Community::create(context.pool(), &community_form)
 111       .await
 112       .map_err(|e| LemmyError::from_error_message(e, "community_already_exists"))?;
 113
 114     // The community creator becomes a moderator
 115     let community_moderator_form = CommunityModeratorForm {
 116       community_id: inserted_community.id,
 117       person_id: local_user_view.person.id,
 118     };
 119
 120     CommunityModerator::join(context.pool(), &community_moderator_form)
 121       .await
 122       .map_err(|e| LemmyError::from_error_message(e, "community_moderator_already_exists"))?;
 123
 124     // Follow your own community
 125     let community_follower_form = CommunityFollowerForm {
 126       community_id: inserted_community.id,
 127       person_id: local_user_view.person.id,
 128       pending: false,
 129     };
 130
 131     CommunityFollower::follow(context.pool(), &community_follower_form)
 132       .await
 133       .map_err(|e| LemmyError::from_error_message(e, "community_follower_already_exists"))?;
 134
 135     // Update the discussion_languages if that's provided
 136     let community_id = inserted_community.id;
 137     if let Some(languages) = data.discussion_languages.clone() {
 138       let site_languages = SiteLanguage::read_local_raw(context.pool()).await?;
 139       // check that community languages are a subset of site languages
 140       // https://stackoverflow.com/a/64227550
 141       let is_subset = languages.iter().all(|item| site_languages.contains(item));
 142       if !is_subset {
 143         return Err(LemmyError::from_message("language_not_allowed"));
 144       }
 145       CommunityLanguage::update(context.pool(), languages, community_id).await?;
 146     }
 147
 148     let person_id = local_user_view.person.id;
 149     let community_view =
 150       CommunityView::read(context.pool(), inserted_community.id, Some(person_id), None).await?;
 151     let discussion_languages =
 152       CommunityLanguage::read(context.pool(), inserted_community.id).await?;
 153
 154     Ok(CommunityResponse {
 155       community_view,
 156       discussion_languages,
 157     })
 158   }
 159 }