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