use crate::{ activities::{verify_is_public, verify_person_in_community}, check_apub_id_valid_with_strictness, local_instance, objects::{read_from_string_or_source_opt, verify_is_remote_object}, protocol::{ objects::page::{Attachment, AttributedTo, Page, PageType}, ImageObject, Source, }, }; use activitypub_federation::{ core::object_id::ObjectId, deser::values::MediaTypeMarkdownOrHtml, traits::ApubObject, utils::verify_domains_match, }; use activitystreams_kinds::public; use chrono::NaiveDateTime; use lemmy_api_common::{request::fetch_site_data, utils::blocking}; use lemmy_db_schema::{ self, source::{ community::Community, moderator::{ModLockPost, ModLockPostForm, ModStickyPost, ModStickyPostForm}, person::Person, post::{Post, PostForm}, }, traits::Crud, }; use lemmy_utils::{ error::LemmyError, utils::{check_slurs, convert_datetime, markdown_to_html, remove_slurs}, }; use lemmy_websocket::LemmyContext; use std::ops::Deref; use url::Url; #[derive(Clone, Debug)] pub struct ApubPost(Post); impl Deref for ApubPost { type Target = Post; fn deref(&self) -> &Self::Target { &self.0 } } impl From for ApubPost { fn from(p: Post) -> Self { ApubPost(p) } } #[async_trait::async_trait(?Send)] impl ApubObject for ApubPost { type DataType = LemmyContext; type ApubType = Page; type DbType = Post; type Error = LemmyError; fn last_refreshed_at(&self) -> Option { None } #[tracing::instrument(skip_all)] async fn read_from_apub_id( object_id: Url, context: &LemmyContext, ) -> Result, LemmyError> { Ok( blocking(context.pool(), move |conn| { Post::read_from_apub_id(conn, object_id) }) .await?? .map(Into::into), ) } #[tracing::instrument(skip_all)] async fn delete(self, context: &LemmyContext) -> Result<(), LemmyError> { if !self.deleted { blocking(context.pool(), move |conn| { Post::update_deleted(conn, self.id, true) }) .await??; } Ok(()) } // Turn a Lemmy post into an ActivityPub page that can be sent out over the network. #[tracing::instrument(skip_all)] async fn into_apub(self, context: &LemmyContext) -> Result { let creator_id = self.creator_id; let creator = blocking(context.pool(), move |conn| Person::read(conn, creator_id)).await??; let community_id = self.community_id; let community = blocking(context.pool(), move |conn| { Community::read(conn, community_id) }) .await??; let page = Page { kind: PageType::Page, id: ObjectId::new(self.ap_id.clone()), attributed_to: AttributedTo::Lemmy(ObjectId::new(creator.actor_id)), to: vec![community.actor_id.into(), public()], cc: vec![], name: self.name.clone(), content: self.body.as_ref().map(|b| markdown_to_html(b)), media_type: Some(MediaTypeMarkdownOrHtml::Html), source: self.body.clone().map(Source::new), url: self.url.clone().map(|u| u.into()), attachment: self.url.clone().map(Attachment::new).into_iter().collect(), image: self.thumbnail_url.clone().map(ImageObject::new), comments_enabled: Some(!self.locked), sensitive: Some(self.nsfw), stickied: Some(self.stickied), published: Some(convert_datetime(self.published)), updated: self.updated.map(convert_datetime), }; Ok(page) } #[tracing::instrument(skip_all)] async fn verify( page: &Page, expected_domain: &Url, context: &LemmyContext, request_counter: &mut i32, ) -> Result<(), LemmyError> { // We can't verify the domain in case of mod action, because the mod may be on a different // instance from the post author. if !page.is_mod_action(context).await? { verify_domains_match(page.id.inner(), expected_domain)?; verify_is_remote_object(page.id.inner(), context.settings())?; }; let community = page.extract_community(context, request_counter).await?; check_apub_id_valid_with_strictness(page.id.inner(), community.local, context.settings())?; verify_person_in_community(&page.creator()?, &community, context, request_counter).await?; check_slurs(&page.name, &context.settings().slur_regex())?; verify_domains_match(page.creator()?.inner(), page.id.inner())?; verify_is_public(&page.to, &page.cc)?; Ok(()) } #[tracing::instrument(skip_all)] async fn from_apub( page: Page, context: &LemmyContext, request_counter: &mut i32, ) -> Result { let creator = page .creator()? .dereference(context, local_instance(context), request_counter) .await?; let community = page.extract_community(context, request_counter).await?; let form = if !page.is_mod_action(context).await? { let url = if let Some(attachment) = page.attachment.first() { Some(match attachment { // url as sent by Lemmy (new) Attachment::Link(link) => link.href.clone(), Attachment::Image(image) => image.url.clone(), }) } else if page.kind == PageType::Video { // we cant display videos directly, so insert a link to external video page Some(page.id.inner().clone()) } else { // url sent by lemmy (old) page.url }; let (metadata_res, thumbnail_url) = if let Some(url) = &url { fetch_site_data(context.client(), context.settings(), Some(url)).await } else { (None, page.image.map(|i| i.url.into())) }; let (embed_title, embed_description, embed_video_url) = metadata_res .map(|u| (Some(u.title), Some(u.description), Some(u.embed_video_url))) .unwrap_or_default(); let body_slurs_removed = read_from_string_or_source_opt(&page.content, &page.media_type, &page.source) .map(|s| Some(remove_slurs(&s, &context.settings().slur_regex()))); PostForm { name: page.name.clone(), url: Some(url.map(Into::into)), body: body_slurs_removed, creator_id: creator.id, community_id: community.id, removed: None, locked: page.comments_enabled.map(|e| !e), published: page.published.map(|u| u.naive_local()), updated: page.updated.map(|u| u.naive_local()), deleted: None, nsfw: page.sensitive, stickied: page.stickied, embed_title, embed_description, embed_video_url, thumbnail_url: Some(thumbnail_url), ap_id: Some(page.id.clone().into()), local: Some(false), } } else { // if is mod action, only update locked/stickied fields, nothing else PostForm { name: page.name.clone(), creator_id: creator.id, community_id: community.id, locked: page.comments_enabled.map(|e| !e), stickied: page.stickied, updated: page.updated.map(|u| u.naive_local()), ap_id: Some(page.id.clone().into()), ..Default::default() } }; // read existing, local post if any (for generating mod log) let old_post = ObjectId::::new(page.id.clone()) .dereference_local(context) .await; let post = blocking(context.pool(), move |conn| Post::upsert(conn, &form)).await??; // write mod log entries for sticky/lock if Page::is_stickied_changed(&old_post, &page.stickied) { let form = ModStickyPostForm { mod_person_id: creator.id, post_id: post.id, stickied: Some(post.stickied), }; blocking(context.pool(), move |conn| { ModStickyPost::create(conn, &form) }) .await??; } if Page::is_locked_changed(&old_post, &page.comments_enabled) { let form = ModLockPostForm { mod_person_id: creator.id, post_id: post.id, locked: Some(post.locked), }; blocking(context.pool(), move |conn| ModLockPost::create(conn, &form)).await??; } Ok(post.into()) } } #[cfg(test)] mod tests { use super::*; use crate::{ objects::{ community::tests::parse_lemmy_community, person::tests::parse_lemmy_person, post::ApubPost, tests::init_context, }, protocol::tests::file_to_json_object, }; use lemmy_db_schema::source::site::Site; use serial_test::serial; #[actix_rt::test] #[serial] async fn test_parse_lemmy_post() { let context = init_context(); let (person, site) = parse_lemmy_person(&context).await; let community = parse_lemmy_community(&context).await; let json = file_to_json_object("assets/lemmy/objects/page.json").unwrap(); let url = Url::parse("https://enterprise.lemmy.ml/post/55143").unwrap(); let mut request_counter = 0; ApubPost::verify(&json, &url, &context, &mut request_counter) .await .unwrap(); let post = ApubPost::from_apub(json, &context, &mut request_counter) .await .unwrap(); assert_eq!(post.ap_id, url.into()); assert_eq!(post.name, "Post title"); assert!(post.body.is_some()); assert_eq!(post.body.as_ref().unwrap().len(), 45); assert!(!post.locked); assert!(post.stickied); assert_eq!(request_counter, 0); Post::delete(&*context.pool().get().unwrap(), post.id).unwrap(); Person::delete(&*context.pool().get().unwrap(), person.id).unwrap(); Community::delete(&*context.pool().get().unwrap(), community.id).unwrap(); Site::delete(&*context.pool().get().unwrap(), site.id).unwrap(); } }