crates/api_crud/src/post/create.rs

   1 use activitypub_federation::config::Data;
   2 use actix_web::web::Json;
   3 use lemmy_api_common::{
   4   build_response::build_post_response,
   5   context::LemmyContext,
   6   post::{CreatePost, PostResponse},
   7   request::fetch_site_data,
   8   send_activity::{ActivityChannel, SendActivityData},
   9   utils::{
  10     check_community_ban,
  11     check_community_deleted_or_removed,
  12     generate_local_apub_endpoint,
  13     honeypot_check,
  14     local_site_to_slur_regex,
  15     local_user_view_from_jwt,
  16     mark_post_as_read,
  17     EndpointType,
  18   },
  19 };
  20 use lemmy_db_schema::{
  21   impls::actor_language::default_post_language,
  22   source::{
  23     actor_language::CommunityLanguage,
  24     community::Community,
  25     local_site::LocalSite,
  26     post::{Post, PostInsertForm, PostLike, PostLikeForm, PostUpdateForm},
  27   },
  28   traits::{Crud, Likeable},
  29 };
  30 use lemmy_db_views_actor::structs::CommunityView;
  31 use lemmy_utils::{
  32   error::{LemmyError, LemmyErrorExt, LemmyErrorType},
  33   spawn_try_task,
  34   utils::{
  35     slurs::{check_slurs, check_slurs_opt},
  36     validation::{check_url_scheme, clean_url_params, is_valid_body_field, is_valid_post_title},
  37   },
  38   SYNCHRONOUS_FEDERATION,
  39 };
  40 use tracing::Instrument;
  41 use url::Url;
  42 use webmention::{Webmention, WebmentionError};
  43
  44 #[tracing::instrument(skip(context))]
  45 pub async fn create_post(
  46   data: Json<CreatePost>,
  47   context: Data<LemmyContext>,
  48 ) -> Result<Json<PostResponse>, LemmyError> {
  49   let local_user_view = local_user_view_from_jwt(&data.auth, &context).await?;
  50   let local_site = LocalSite::read(&mut context.pool()).await?;
  51
  52   let slur_regex = local_site_to_slur_regex(&local_site);
  53   check_slurs(&data.name, &slur_regex)?;
  54   check_slurs_opt(&data.body, &slur_regex)?;
  55   honeypot_check(&data.honeypot)?;
  56
  57   let data_url = data.url.as_ref();
  58   let url = data_url.map(clean_url_params).map(Into::into); // TODO no good way to handle a "clear"
  59
  60   is_valid_post_title(&data.name)?;
  61   is_valid_body_field(&data.body, true)?;
  62   check_url_scheme(&data.url)?;
  63
  64   check_community_ban(
  65     local_user_view.person.id,
  66     data.community_id,
  67     &mut context.pool(),
  68   )
  69   .await?;
  70   check_community_deleted_or_removed(data.community_id, &mut context.pool()).await?;
  71
  72   let community_id = data.community_id;
  73   let community = Community::read(&mut context.pool(), community_id).await?;
  74   if community.posting_restricted_to_mods {
  75     let community_id = data.community_id;
  76     let is_mod = CommunityView::is_mod_or_admin(
  77       &mut context.pool(),
  78       local_user_view.local_user.person_id,
  79       community_id,
  80     )
  81     .await?;
  82     if !is_mod {
  83       return Err(LemmyErrorType::OnlyModsCanPostInCommunity)?;
  84     }
  85   }
  86
  87   // Fetch post links and pictrs cached image
  88   let (metadata_res, thumbnail_url) =
  89     fetch_site_data(context.client(), context.settings(), data_url, true).await;
  90   let (embed_title, embed_description, embed_video_url) = metadata_res
  91     .map(|u| (u.title, u.description, u.embed_video_url))
  92     .unwrap_or_default();
  93
  94   // Only need to check if language is allowed in case user set it explicitly. When using default
  95   // language, it already only returns allowed languages.
  96   CommunityLanguage::is_allowed_community_language(
  97     &mut context.pool(),
  98     data.language_id,
  99     community_id,
 100   )
 101   .await?;
 102
 103   // attempt to set default language if none was provided
 104   let language_id = match data.language_id {
 105     Some(lid) => Some(lid),
 106     None => {
 107       default_post_language(
 108         &mut context.pool(),
 109         community_id,
 110         local_user_view.local_user.id,
 111       )
 112       .await?
 113     }
 114   };
 115
 116   let post_form = PostInsertForm::builder()
 117     .name(data.name.trim().to_owned())
 118     .url(url)
 119     .body(data.body.clone())
 120     .community_id(data.community_id)
 121     .creator_id(local_user_view.person.id)
 122     .nsfw(data.nsfw)
 123     .embed_title(embed_title)
 124     .embed_description(embed_description)
 125     .embed_video_url(embed_video_url)
 126     .language_id(language_id)
 127     .thumbnail_url(thumbnail_url)
 128     .build();
 129
 130   let inserted_post = Post::create(&mut context.pool(), &post_form)
 131     .await
 132     .with_lemmy_type(LemmyErrorType::CouldntCreatePost)?;
 133
 134   let inserted_post_id = inserted_post.id;
 135   let protocol_and_hostname = context.settings().get_protocol_and_hostname();
 136   let apub_id = generate_local_apub_endpoint(
 137     EndpointType::Post,
 138     &inserted_post_id.to_string(),
 139     &protocol_and_hostname,
 140   )?;
 141   let updated_post = Post::update(
 142     &mut context.pool(),
 143     inserted_post_id,
 144     &PostUpdateForm::builder().ap_id(Some(apub_id)).build(),
 145   )
 146   .await
 147   .with_lemmy_type(LemmyErrorType::CouldntCreatePost)?;
 148
 149   // They like their own post by default
 150   let person_id = local_user_view.person.id;
 151   let post_id = inserted_post.id;
 152   let like_form = PostLikeForm {
 153     post_id,
 154     person_id,
 155     score: 1,
 156   };
 157
 158   PostLike::like(&mut context.pool(), &like_form)
 159     .await
 160     .with_lemmy_type(LemmyErrorType::CouldntLikePost)?;
 161
 162   ActivityChannel::submit_activity(SendActivityData::CreatePost(updated_post.clone()), &context)
 163     .await?;
 164
 165   // Mark the post as read
 166   mark_post_as_read(person_id, post_id, &mut context.pool()).await?;
 167
 168   if let Some(url) = updated_post.url.clone() {
 169     let task = async move {
 170       let mut webmention =
 171         Webmention::new::<Url>(updated_post.ap_id.clone().into(), url.clone().into())?;
 172       webmention.set_checked(true);
 173       match webmention
 174         .send()
 175         .instrument(tracing::info_span!("Sending webmention"))
 176         .await
 177       {
 178         Err(WebmentionError::NoEndpointDiscovered(_)) => Ok(()),
 179         Ok(_) => Ok(()),
 180         Err(e) => Err(e).with_lemmy_type(LemmyErrorType::CouldntSendWebmention),
 181       }
 182     };
 183     if *SYNCHRONOUS_FEDERATION {
 184       task.await?;
 185     } else {
 186       spawn_try_task(task);
 187     }
 188   };
 189
 190   Ok(Json(
 191     build_post_response(&context, community_id, person_id, post_id).await?,
 192   ))
 193 }