crates/apub/src/objects/post.rs

   1 use crate::{
   2   check_is_apub_id_valid,
   3   extensions::{context::lemmy_context, page_extension::PageExtension},
   4   fetcher::user::get_or_fetch_and_upsert_user,
   5   objects::{
   6     check_object_domain,
   7     check_object_for_community_or_site_ban,
   8     create_tombstone,
   9     get_object_from_apub,
  10     get_source_markdown_value,
  11     get_to_community,
  12     set_content_and_source,
  13     FromApub,
  14     FromApubToForm,
  15     ToApub,
  16   },
  17   PageExt,
  18 };
  19 use activitystreams::{
  20   object::{kind::PageType, ApObject, Image, Page, Tombstone},
  21   prelude::*,
  22   public,
  23 };
  24 use activitystreams_ext::Ext1;
  25 use anyhow::Context;
  26 use lemmy_api_structs::blocking;
  27 use lemmy_db_queries::{Crud, DbPool};
  28 use lemmy_db_schema::{
  29   self,
  30   source::{
  31     community::Community,
  32     post::{Post, PostForm},
  33     user::User_,
  34   },
  35 };
  36 use lemmy_utils::{
  37   location_info,
  38   request::fetch_iframely_and_pictrs_data,
  39   utils::{check_slurs, convert_datetime, remove_slurs},
  40   LemmyError,
  41 };
  42 use lemmy_websocket::LemmyContext;
  43 use url::Url;
  44
  45 #[async_trait::async_trait(?Send)]
  46 impl ToApub for Post {
  47   type ApubType = PageExt;
  48
  49   // Turn a Lemmy post into an ActivityPub page that can be sent out over the network.
  50   async fn to_apub(&self, pool: &DbPool) -> Result<PageExt, LemmyError> {
  51     let mut page = ApObject::new(Page::new());
  52
  53     let creator_id = self.creator_id;
  54     let creator = blocking(pool, move |conn| User_::read(conn, creator_id)).await??;
  55
  56     let community_id = self.community_id;
  57     let community = blocking(pool, move |conn| Community::read(conn, community_id)).await??;
  58
  59     page
  60       // Not needed when the Post is embedded in a collection (like for community outbox)
  61       // TODO: need to set proper context defining sensitive/commentsEnabled fields
  62       // https://git.asonix.dog/Aardwolf/activitystreams/issues/5
  63       .set_many_contexts(lemmy_context()?)
  64       .set_id(self.ap_id.to_owned().into_inner())
  65       .set_name(self.name.to_owned())
  66       // `summary` field for compatibility with lemmy v0.9.9 and older,
  67       // TODO: remove this after some time
  68       .set_summary(self.name.to_owned())
  69       .set_published(convert_datetime(self.published))
  70       .set_many_tos(vec![community.actor_id.into_inner(), public()])
  71       .set_attributed_to(creator.actor_id.into_inner());
  72
  73     if let Some(body) = &self.body {
  74       set_content_and_source(&mut page, &body)?;
  75     }
  76
  77     if let Some(url) = &self.url {
  78       page.set_url::<Url>(url.to_owned().into());
  79     }
  80
  81     if let Some(thumbnail_url) = &self.thumbnail_url {
  82       let mut image = Image::new();
  83       image.set_url::<Url>(thumbnail_url.to_owned().into());
  84       page.set_image(image.into_any_base()?);
  85     }
  86
  87     if let Some(u) = self.updated {
  88       page.set_updated(convert_datetime(u));
  89     }
  90
  91     let ext = PageExtension {
  92       comments_enabled: Some(!self.locked),
  93       sensitive: Some(self.nsfw),
  94       stickied: Some(self.stickied),
  95     };
  96     Ok(Ext1::new(page, ext))
  97   }
  98
  99   fn to_tombstone(&self) -> Result<Tombstone, LemmyError> {
 100     create_tombstone(
 101       self.deleted,
 102       self.ap_id.to_owned().into(),
 103       self.updated,
 104       PageType::Page,
 105     )
 106   }
 107 }
 108
 109 #[async_trait::async_trait(?Send)]
 110 impl FromApub for Post {
 111   type ApubType = PageExt;
 112
 113   /// Converts a `PageExt` to `PostForm`.
 114   ///
 115   /// If the post's community or creator are not known locally, these are also fetched.
 116   async fn from_apub(
 117     page: &PageExt,
 118     context: &LemmyContext,
 119     expected_domain: Option<Url>,
 120     request_counter: &mut i32,
 121   ) -> Result<Post, LemmyError> {
 122     let post: Post = get_object_from_apub(page, context, expected_domain, request_counter).await?;
 123     check_object_for_community_or_site_ban(page, post.community_id, context, request_counter)
 124       .await?;
 125     Ok(post)
 126   }
 127 }
 128
 129 #[async_trait::async_trait(?Send)]
 130 impl FromApubToForm<PageExt> for PostForm {
 131   async fn from_apub(
 132     page: &PageExt,
 133     context: &LemmyContext,
 134     expected_domain: Option<Url>,
 135     request_counter: &mut i32,
 136   ) -> Result<PostForm, LemmyError> {
 137     let ap_id = match expected_domain {
 138       Some(e) => check_object_domain(page, e)?,
 139       None => {
 140         let id = page.id_unchecked().context(location_info!())?;
 141         check_is_apub_id_valid(id)?;
 142         id.to_owned().into()
 143       }
 144     };
 145     let ext = &page.ext_one;
 146     let creator_actor_id = page
 147       .inner
 148       .attributed_to()
 149       .as_ref()
 150       .context(location_info!())?
 151       .as_single_xsd_any_uri()
 152       .context(location_info!())?;
 153
 154     let creator = get_or_fetch_and_upsert_user(creator_actor_id, context, request_counter).await?;
 155
 156     let community = get_to_community(page, context, request_counter).await?;
 157
 158     let thumbnail_url: Option<Url> = match &page.inner.image() {
 159       Some(any_image) => Image::from_any_base(
 160         any_image
 161           .to_owned()
 162           .as_one()
 163           .context(location_info!())?
 164           .to_owned(),
 165       )?
 166       .context(location_info!())?
 167       .url()
 168       .context(location_info!())?
 169       .as_single_xsd_any_uri()
 170       .map(|url| url.to_owned()),
 171       None => None,
 172     };
 173     let url = page
 174       .inner
 175       .url()
 176       .map(|u| u.as_single_xsd_any_uri())
 177       .flatten()
 178       .map(|u| u.to_owned());
 179
 180     let (iframely_title, iframely_description, iframely_html, pictrs_thumbnail) =
 181       if let Some(url) = &url {
 182         fetch_iframely_and_pictrs_data(context.client(), Some(url)).await
 183       } else {
 184         (None, None, None, thumbnail_url)
 185       };
 186
 187     let name = page
 188       .inner
 189       .name()
 190       // The following is for compatibility with lemmy v0.9.9 and older
 191       // TODO: remove it after some time (along with the map above)
 192       .or_else(|| page.inner.summary())
 193       .context(location_info!())?
 194       .as_single_xsd_string()
 195       .context(location_info!())?
 196       .to_string();
 197     let body = get_source_markdown_value(page)?;
 198
 199     // TODO: expected_domain is wrong in this case, because it simply takes the domain of the actor
 200     //       maybe we need to take id_unchecked() if the activity is from community to user?
 201     //       why did this work before? -> i dont think it did?
 202     //       -> try to make expected_domain optional and set it null if it is a mod action
 203
 204     check_slurs(&name)?;
 205     let body_slurs_removed = body.map(|b| remove_slurs(&b));
 206     Ok(PostForm {
 207       name,
 208       url: url.map(|u| u.into()),
 209       body: body_slurs_removed,
 210       creator_id: creator.id,
 211       community_id: community.id,
 212       removed: None,
 213       locked: ext.comments_enabled.map(|e| !e),
 214       published: page
 215         .inner
 216         .published()
 217         .as_ref()
 218         .map(|u| u.to_owned().naive_local()),
 219       updated: page
 220         .inner
 221         .updated()
 222         .as_ref()
 223         .map(|u| u.to_owned().naive_local()),
 224       deleted: None,
 225       nsfw: ext.sensitive.unwrap_or(false),
 226       stickied: ext.stickied.or(Some(false)),
 227       embed_title: iframely_title,
 228       embed_description: iframely_description,
 229       embed_html: iframely_html,
 230       thumbnail_url: pictrs_thumbnail.map(|u| u.into()),
 231       ap_id: Some(ap_id),
 232       local: false,
 233     })
 234   }
 235 }