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   utils::diesel_option_overwrite,
  28 };
  29 use lemmy_db_views_actor::structs::CommunityView;
  30 use lemmy_utils::{
  31   error::LemmyError,
  32   utils::{check_slurs, check_slurs_opt, clean_url_params, is_valid_post_title},
  33   ConnectionId,
  34 };
  35 use lemmy_websocket::{send::send_post_ws_message, LemmyContext, UserOperationCrud};
  36 use tracing::{warn, Instrument};
  37 use url::Url;
  38 use webmention::{Webmention, WebmentionError};
  39
  40 #[async_trait::async_trait(?Send)]
  41 impl PerformCrud for CreatePost {
  42   type Response = PostResponse;
  43
  44   #[tracing::instrument(skip(context, websocket_id))]
  45   async fn perform(
  46     &self,
  47     context: &Data<LemmyContext>,
  48     websocket_id: Option<ConnectionId>,
  49   ) -> Result<PostResponse, LemmyError> {
  50     let data: &CreatePost = self;
  51     let local_user_view =
  52       get_local_user_view_from_jwt(&data.auth, context.pool(), context.secret()).await?;
  53
  54     let slur_regex = &context.settings().slur_regex();
  55     check_slurs(&data.name, slur_regex)?;
  56     check_slurs_opt(&data.body, slur_regex)?;
  57     honeypot_check(&data.honeypot)?;
  58
  59     let data_url = data.url.as_ref();
  60     let url = Some(data_url.map(clean_url_params).map(Into::into)); // TODO no good way to handle a "clear"
  61     let body = diesel_option_overwrite(&data.body);
  62
  63     if !is_valid_post_title(&data.name) {
  64       return Err(LemmyError::from_message("invalid_post_title"));
  65     }
  66
  67     check_community_ban(local_user_view.person.id, data.community_id, context.pool()).await?;
  68     check_community_deleted_or_removed(data.community_id, context.pool()).await?;
  69
  70     let community_id = data.community_id;
  71     let community = blocking(context.pool(), move |conn| {
  72       Community::read(conn, community_id)
  73     })
  74     .await??;
  75     if community.posting_restricted_to_mods {
  76       let community_id = data.community_id;
  77       let is_mod = blocking(context.pool(), move |conn| {
  78         CommunityView::is_mod_or_admin(conn, local_user_view.local_user.person_id, community_id)
  79       })
  80       .await?;
  81       if !is_mod {
  82         return Err(LemmyError::from_message("only_mods_can_post_in_community"));
  83       }
  84     }
  85
  86     // Fetch post links and pictrs cached image
  87     let (metadata_res, thumbnail_url) =
  88       fetch_site_data(context.client(), context.settings(), data_url).await;
  89     let (embed_title, embed_description, embed_video_url) = metadata_res
  90       .map(|u| (Some(u.title), Some(u.description), Some(u.embed_video_url)))
  91       .unwrap_or_default();
  92
  93     let post_form = PostForm {
  94       name: data.name.trim().to_owned(),
  95       url,
  96       body,
  97       community_id: data.community_id,
  98       creator_id: local_user_view.person.id,
  99       nsfw: data.nsfw,
 100       embed_title,
 101       embed_description,
 102       embed_video_url,
 103       thumbnail_url: Some(thumbnail_url),
 104       ..PostForm::default()
 105     };
 106
 107     let inserted_post =
 108       match blocking(context.pool(), move |conn| Post::create(conn, &post_form)).await? {
 109         Ok(post) => post,
 110         Err(e) => {
 111           let err_type = if e.to_string() == "value too long for type character varying(200)" {
 112             "post_title_too_long"
 113           } else {
 114             "couldnt_create_post"
 115           };
 116
 117           return Err(LemmyError::from_error_message(e, err_type));
 118         }
 119       };
 120
 121     let inserted_post_id = inserted_post.id;
 122     let protocol_and_hostname = context.settings().get_protocol_and_hostname();
 123     let updated_post = blocking(context.pool(), move |conn| -> Result<Post, LemmyError> {
 124       let apub_id = generate_local_apub_endpoint(
 125         EndpointType::Post,
 126         &inserted_post_id.to_string(),
 127         &protocol_and_hostname,
 128       )?;
 129       Ok(Post::update_ap_id(conn, inserted_post_id, apub_id)?)
 130     })
 131     .await?
 132     .map_err(|e| e.with_message("couldnt_create_post"))?;
 133
 134     // They like their own post by default
 135     let person_id = local_user_view.person.id;
 136     let post_id = inserted_post.id;
 137     let like_form = PostLikeForm {
 138       post_id,
 139       person_id,
 140       score: 1,
 141     };
 142
 143     let like = move |conn: &'_ _| PostLike::like(conn, &like_form);
 144     blocking(context.pool(), like)
 145       .await?
 146       .map_err(|e| LemmyError::from_error_message(e, "couldnt_like_post"))?;
 147
 148     // Mark the post as read
 149     mark_post_as_read(person_id, post_id, context.pool()).await?;
 150
 151     if let Some(url) = &updated_post.url {
 152       let mut webmention =
 153         Webmention::new::<Url>(updated_post.ap_id.clone().into(), url.clone().into())?;
 154       webmention.set_checked(true);
 155       match webmention
 156         .send()
 157         .instrument(tracing::info_span!("Sending webmention"))
 158         .await
 159       {
 160         Ok(_) => {}
 161         Err(WebmentionError::NoEndpointDiscovered(_)) => {}
 162         Err(e) => warn!("Failed to send webmention: {}", e),
 163       }
 164     }
 165
 166     let apub_post: ApubPost = updated_post.into();
 167     CreateOrUpdatePost::send(
 168       apub_post.clone(),
 169       &local_user_view.person.clone().into(),
 170       CreateOrUpdateType::Create,
 171       context,
 172     )
 173     .await?;
 174
 175     send_post_ws_message(
 176       inserted_post.id,
 177       UserOperationCrud::CreatePost,
 178       websocket_id,
 179       Some(local_user_view.person.id),
 180       context,
 181     )
 182     .await
 183   }
 184 }