crates/api_crud/src/post/create.rs

   1 use crate::PerformCrud;
   2 use actix_web::web::Data;
   3 use lemmy_api_common::{
   4   post::{CreatePost, PostResponse},
   5   request::fetch_site_data,
   6   utils::{
   7     blocking,
   8     check_community_ban,
   9     check_community_deleted_or_removed,
  10     get_local_user_view_from_jwt,
  11     honeypot_check,
  12     mark_post_as_read,
  13   },
  14 };
  15 use lemmy_apub::{
  16   generate_local_apub_endpoint,
  17   objects::post::ApubPost,
  18   protocol::activities::{create_or_update::post::CreateOrUpdatePost, CreateOrUpdateType},
  19   EndpointType,
  20 };
  21 use lemmy_db_schema::{
  22   source::{
  23     community::Community,
  24     post::{Post, PostForm, PostLike, PostLikeForm},
  25   },
  26   traits::{Crud, Likeable},
  27 };
  28 use lemmy_db_views_actor::structs::CommunityView;
  29 use lemmy_utils::{
  30   error::LemmyError,
  31   utils::{
  32     check_slurs,
  33     check_slurs_opt,
  34     clean_optional_text,
  35     clean_url_params,
  36     is_valid_post_title,
  37   },
  38   ConnectionId,
  39 };
  40 use lemmy_websocket::{send::send_post_ws_message, LemmyContext, UserOperationCrud};
  41 use tracing::{warn, Instrument};
  42 use url::Url;
  43 use webmention::{Webmention, WebmentionError};
  44
  45 #[async_trait::async_trait(?Send)]
  46 impl PerformCrud for CreatePost {
  47   type Response = PostResponse;
  48
  49   #[tracing::instrument(skip(context, websocket_id))]
  50   async fn perform(
  51     &self,
  52     context: &Data<LemmyContext>,
  53     websocket_id: Option<ConnectionId>,
  54   ) -> Result<PostResponse, LemmyError> {
  55     let data: &CreatePost = self;
  56     let local_user_view =
  57       get_local_user_view_from_jwt(&data.auth, context.pool(), context.secret()).await?;
  58
  59     let slur_regex = &context.settings().slur_regex();
  60     check_slurs(&data.name, slur_regex)?;
  61     check_slurs_opt(&data.body, slur_regex)?;
  62     honeypot_check(&data.honeypot)?;
  63
  64     if !is_valid_post_title(&data.name) {
  65       return Err(LemmyError::from_message("invalid_post_title"));
  66     }
  67
  68     check_community_ban(local_user_view.person.id, data.community_id, context.pool()).await?;
  69     check_community_deleted_or_removed(data.community_id, context.pool()).await?;
  70
  71     let community_id = data.community_id;
  72     let community = blocking(context.pool(), move |conn| {
  73       Community::read(conn, community_id)
  74     })
  75     .await??;
  76     if community.posting_restricted_to_mods {
  77       let community_id = data.community_id;
  78       let is_mod = blocking(context.pool(), move |conn| {
  79         CommunityView::is_mod_or_admin(conn, local_user_view.local_user.person_id, community_id)
  80       })
  81       .await?;
  82       if !is_mod {
  83         return Err(LemmyError::from_message("only_mods_can_post_in_community"));
  84       }
  85     }
  86
  87     // Fetch post links and pictrs cached image
  88     let data_url = data.url.as_ref();
  89     let (metadata_res, thumbnail_url) =
  90       fetch_site_data(context.client(), &context.settings(), data_url).await;
  91     let (embed_title, embed_description, embed_video_url) = metadata_res
  92       .map(|u| (u.title, u.description, u.embed_video_url))
  93       .unwrap_or_default();
  94
  95     let post_form = PostForm {
  96       name: data.name.trim().to_owned(),
  97       url: data_url.map(|u| clean_url_params(u.to_owned()).into()),
  98       body: clean_optional_text(&data.body),
  99       community_id: data.community_id,
 100       creator_id: local_user_view.person.id,
 101       nsfw: data.nsfw,
 102       embed_title,
 103       embed_description,
 104       embed_video_url,
 105       thumbnail_url,
 106       ..PostForm::default()
 107     };
 108
 109     let inserted_post =
 110       match blocking(context.pool(), move |conn| Post::create(conn, &post_form)).await? {
 111         Ok(post) => post,
 112         Err(e) => {
 113           let err_type = if e.to_string() == "value too long for type character varying(200)" {
 114             "post_title_too_long"
 115           } else {
 116             "couldnt_create_post"
 117           };
 118
 119           return Err(LemmyError::from_error_message(e, err_type));
 120         }
 121       };
 122
 123     let inserted_post_id = inserted_post.id;
 124     let protocol_and_hostname = context.settings().get_protocol_and_hostname();
 125     let updated_post = blocking(context.pool(), move |conn| -> Result<Post, LemmyError> {
 126       let apub_id = generate_local_apub_endpoint(
 127         EndpointType::Post,
 128         &inserted_post_id.to_string(),
 129         &protocol_and_hostname,
 130       )?;
 131       Ok(Post::update_ap_id(conn, inserted_post_id, apub_id)?)
 132     })
 133     .await?
 134     .map_err(|e| e.with_message("couldnt_create_post"))?;
 135
 136     // They like their own post by default
 137     let person_id = local_user_view.person.id;
 138     let post_id = inserted_post.id;
 139     let like_form = PostLikeForm {
 140       post_id,
 141       person_id,
 142       score: 1,
 143     };
 144
 145     let like = move |conn: &'_ _| PostLike::like(conn, &like_form);
 146     blocking(context.pool(), like)
 147       .await?
 148       .map_err(|e| LemmyError::from_error_message(e, "couldnt_like_post"))?;
 149
 150     // Mark the post as read
 151     mark_post_as_read(person_id, post_id, context.pool()).await?;
 152
 153     if let Some(url) = &updated_post.url {
 154       let mut webmention =
 155         Webmention::new::<Url>(updated_post.ap_id.clone().into(), url.clone().into())?;
 156       webmention.set_checked(true);
 157       match webmention
 158         .send()
 159         .instrument(tracing::info_span!("Sending webmention"))
 160         .await
 161       {
 162         Ok(_) => {}
 163         Err(WebmentionError::NoEndpointDiscovered(_)) => {}
 164         Err(e) => warn!("Failed to send webmention: {}", e),
 165       }
 166     }
 167
 168     let apub_post: ApubPost = updated_post.into();
 169     CreateOrUpdatePost::send(
 170       apub_post.clone(),
 171       &local_user_view.person.clone().into(),
 172       CreateOrUpdateType::Create,
 173       context,
 174     )
 175     .await?;
 176
 177     send_post_ws_message(
 178       inserted_post.id,
 179       UserOperationCrud::CreatePost,
 180       websocket_id,
 181       Some(local_user_view.person.id),
 182       context,
 183     )
 184     .await
 185   }
 186 }