crates/api_crud/src/community/create.rs

   1 use activitypub_federation::{config::Data, http_signatures::generate_actor_keypair};
   2 use actix_web::web::Json;
   3 use lemmy_api_common::{
   4   build_response::build_community_response,
   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     sanitize_html,
  16     sanitize_html_opt,
  17     EndpointType,
  18   },
  19 };
  20 use lemmy_db_schema::{
  21   source::{
  22     actor_language::{CommunityLanguage, SiteLanguage},
  23     community::{
  24       Community,
  25       CommunityFollower,
  26       CommunityFollowerForm,
  27       CommunityInsertForm,
  28       CommunityModerator,
  29       CommunityModeratorForm,
  30     },
  31   },
  32   traits::{ApubActor, Crud, Followable, Joinable},
  33   utils::diesel_option_overwrite_to_url_create,
  34 };
  35 use lemmy_db_views::structs::SiteView;
  36 use lemmy_utils::{
  37   error::{LemmyError, LemmyErrorExt, LemmyErrorType},
  38   utils::{
  39     slurs::{check_slurs, check_slurs_opt},
  40     validation::{is_valid_actor_name, is_valid_body_field},
  41   },
  42 };
  43
  44 #[tracing::instrument(skip(context))]
  45 pub async fn create_community(
  46   data: Json<CreateCommunity>,
  47   context: Data<LemmyContext>,
  48 ) -> Result<Json<CommunityResponse>, LemmyError> {
  49   let local_user_view = local_user_view_from_jwt(&data.auth, &context).await?;
  50   let site_view = SiteView::read_local(&mut context.pool()).await?;
  51   let local_site = site_view.local_site;
  52
  53   if local_site.community_creation_admin_only && is_admin(&local_user_view).is_err() {
  54     return Err(LemmyErrorType::OnlyAdminsCanCreateCommunities)?;
  55   }
  56
  57   // Check to make sure the icon and banners are urls
  58   let icon = diesel_option_overwrite_to_url_create(&data.icon)?;
  59   let banner = diesel_option_overwrite_to_url_create(&data.banner)?;
  60
  61   let name = sanitize_html(&data.name);
  62   let title = sanitize_html(&data.title);
  63   let description = sanitize_html_opt(&data.description);
  64
  65   let slur_regex = local_site_to_slur_regex(&local_site);
  66   check_slurs(&name, &slur_regex)?;
  67   check_slurs(&title, &slur_regex)?;
  68   check_slurs_opt(&description, &slur_regex)?;
  69
  70   is_valid_actor_name(&data.name, local_site.actor_name_max_length as usize)?;
  71   is_valid_body_field(&data.description, false)?;
  72
  73   // Double check for duplicate community actor_ids
  74   let community_actor_id = generate_local_apub_endpoint(
  75     EndpointType::Community,
  76     &data.name,
  77     &context.settings().get_protocol_and_hostname(),
  78   )?;
  79   let community_dupe =
  80     Community::read_from_apub_id(&mut context.pool(), &community_actor_id).await?;
  81   if community_dupe.is_some() {
  82     return Err(LemmyErrorType::CommunityAlreadyExists)?;
  83   }
  84
  85   // When you create a community, make sure the user becomes a moderator and a follower
  86   let keypair = generate_actor_keypair()?;
  87
  88   let community_form = CommunityInsertForm::builder()
  89     .name(name)
  90     .title(title)
  91     .description(description)
  92     .icon(icon)
  93     .banner(banner)
  94     .nsfw(data.nsfw)
  95     .actor_id(Some(community_actor_id.clone()))
  96     .private_key(Some(keypair.private_key))
  97     .public_key(keypair.public_key)
  98     .followers_url(Some(generate_followers_url(&community_actor_id)?))
  99     .inbox_url(Some(generate_inbox_url(&community_actor_id)?))
 100     .shared_inbox_url(Some(generate_shared_inbox_url(&community_actor_id)?))
 101     .posting_restricted_to_mods(data.posting_restricted_to_mods)
 102     .instance_id(site_view.site.instance_id)
 103     .build();
 104
 105   let inserted_community = Community::create(&mut context.pool(), &community_form)
 106     .await
 107     .with_lemmy_type(LemmyErrorType::CommunityAlreadyExists)?;
 108
 109   // The community creator becomes a moderator
 110   let community_moderator_form = CommunityModeratorForm {
 111     community_id: inserted_community.id,
 112     person_id: local_user_view.person.id,
 113   };
 114
 115   CommunityModerator::join(&mut context.pool(), &community_moderator_form)
 116     .await
 117     .with_lemmy_type(LemmyErrorType::CommunityModeratorAlreadyExists)?;
 118
 119   // Follow your own community
 120   let community_follower_form = CommunityFollowerForm {
 121     community_id: inserted_community.id,
 122     person_id: local_user_view.person.id,
 123     pending: false,
 124   };
 125
 126   CommunityFollower::follow(&mut context.pool(), &community_follower_form)
 127     .await
 128     .with_lemmy_type(LemmyErrorType::CommunityFollowerAlreadyExists)?;
 129
 130   // Update the discussion_languages if that's provided
 131   let community_id = inserted_community.id;
 132   if let Some(languages) = data.discussion_languages.clone() {
 133     let site_languages = SiteLanguage::read_local_raw(&mut context.pool()).await?;
 134     // check that community languages are a subset of site languages
 135     // https://stackoverflow.com/a/64227550
 136     let is_subset = languages.iter().all(|item| site_languages.contains(item));
 137     if !is_subset {
 138       return Err(LemmyErrorType::LanguageNotAllowed)?;
 139     }
 140     CommunityLanguage::update(&mut context.pool(), languages, community_id).await?;
 141   }
 142
 143   build_community_response(&context, local_user_view, community_id).await
 144 }