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     sanitize_html,
  17     sanitize_html_opt,
  18     EndpointType,
  19   },
  20 };
  21 use lemmy_db_schema::{
  22   source::{
  23     actor_language::{CommunityLanguage, SiteLanguage},
  24     community::{
  25       Community,
  26       CommunityFollower,
  27       CommunityFollowerForm,
  28       CommunityInsertForm,
  29       CommunityModerator,
  30       CommunityModeratorForm,
  31     },
  32   },
  33   traits::{ApubActor, Crud, Followable, Joinable},
  34   utils::diesel_option_overwrite_to_url_create,
  35 };
  36 use lemmy_db_views::structs::SiteView;
  37 use lemmy_utils::{
  38   error::{LemmyError, LemmyErrorExt, LemmyErrorType},
  39   utils::{
  40     slurs::{check_slurs, check_slurs_opt},
  41     validation::{is_valid_actor_name, is_valid_body_field},
  42   },
  43 };
  44
  45 #[async_trait::async_trait(?Send)]
  46 impl PerformCrud for CreateCommunity {
  47   type Response = CommunityResponse;
  48
  49   #[tracing::instrument(skip(context))]
  50   async fn perform(&self, context: &Data<LemmyContext>) -> Result<CommunityResponse, LemmyError> {
  51     let data: &CreateCommunity = self;
  52     let local_user_view = local_user_view_from_jwt(&data.auth, context).await?;
  53     let site_view = SiteView::read_local(&mut context.pool()).await?;
  54     let local_site = site_view.local_site;
  55
  56     if local_site.community_creation_admin_only && is_admin(&local_user_view).is_err() {
  57       return Err(LemmyErrorType::OnlyAdminsCanCreateCommunities)?;
  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 name = sanitize_html(&data.name);
  65     let title = sanitize_html(&data.title);
  66     let description = sanitize_html_opt(&data.description);
  67
  68     let slur_regex = local_site_to_slur_regex(&local_site);
  69     check_slurs(&name, &slur_regex)?;
  70     check_slurs(&title, &slur_regex)?;
  71     check_slurs_opt(&description, &slur_regex)?;
  72
  73     is_valid_actor_name(&data.name, local_site.actor_name_max_length as usize)?;
  74     is_valid_body_field(&data.description, false)?;
  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 =
  83       Community::read_from_apub_id(&mut context.pool(), &community_actor_id).await?;
  84     if community_dupe.is_some() {
  85       return Err(LemmyErrorType::CommunityAlreadyExists)?;
  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(name)
  93       .title(title)
  94       .description(description)
  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(&mut context.pool(), &community_form)
 109       .await
 110       .with_lemmy_type(LemmyErrorType::CommunityAlreadyExists)?;
 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(&mut context.pool(), &community_moderator_form)
 119       .await
 120       .with_lemmy_type(LemmyErrorType::CommunityModeratorAlreadyExists)?;
 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(&mut context.pool(), &community_follower_form)
 130       .await
 131       .with_lemmy_type(LemmyErrorType::CommunityFollowerAlreadyExists)?;
 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(&mut 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(LemmyErrorType::LanguageNotAllowed)?;
 142       }
 143       CommunityLanguage::update(&mut context.pool(), languages, community_id).await?;
 144     }
 145
 146     build_community_response(context, local_user_view, community_id).await
 147   }
 148 }