lemmy/crates/apub/src/objects/post.rs

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use crate::{
activities::verify_person_in_community,
check_is_apub_id_valid,
fetcher::object_id::ObjectId,
protocol::{
objects::{page::Page, tombstone::Tombstone},
ImageObject,
Source,
},
};
use activitystreams::{
object::kind::{ImageType, PageType},
public,
};
use chrono::NaiveDateTime;
use lemmy_api_common::blocking;
use lemmy_apub_lib::{
traits::ApubObject,
values::{MediaTypeHtml, MediaTypeMarkdown},
};
use lemmy_db_schema::{
self,
source::{
community::Community,
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person::Person,
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post::{Post, PostForm},
},
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traits::Crud,
};
use lemmy_utils::{
request::fetch_site_data,
utils::{convert_datetime, markdown_to_html, remove_slurs},
LemmyError,
};
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<Post> for ApubPost {
fn from(p: Post) -> Self {
ApubPost { 0: p }
}
}
#[async_trait::async_trait(?Send)]
impl ApubObject for ApubPost {
type DataType = LemmyContext;
type ApubType = Page;
type TombstoneType = Tombstone;
fn last_refreshed_at(&self) -> Option<NaiveDateTime> {
None
}
async fn read_from_apub_id(
object_id: Url,
context: &LemmyContext,
) -> Result<Option<Self>, LemmyError> {
Ok(
blocking(context.pool(), move |conn| {
Post::read_from_apub_id(conn, object_id)
})
.await??
.map(Into::into),
)
}
async fn delete(self, context: &LemmyContext) -> Result<(), LemmyError> {
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.
async fn to_apub(&self, context: &LemmyContext) -> Result<Page, LemmyError> {
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 source = self.body.clone().map(|body| Source {
content: body,
media_type: MediaTypeMarkdown::Markdown,
});
let image = self.thumbnail_url.clone().map(|thumb| ImageObject {
kind: ImageType::Image,
url: thumb.into(),
});
let page = Page {
r#type: PageType::Page,
id: self.ap_id.clone().into(),
attributed_to: ObjectId::new(creator.actor_id),
to: vec![community.actor_id.into(), public()],
name: self.name.clone(),
content: self.body.as_ref().map(|b| markdown_to_html(b)),
media_type: Some(MediaTypeHtml::Html),
source,
url: self.url.clone().map(|u| u.into()),
image,
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),
unparsed: Default::default(),
};
Ok(page)
}
fn to_tombstone(&self) -> Result<Tombstone, LemmyError> {
Ok(Tombstone::new(
PageType::Page,
self.updated.unwrap_or(self.published),
))
}
async fn from_apub(
page: &Page,
context: &LemmyContext,
expected_domain: &Url,
request_counter: &mut i32,
) -> Result<ApubPost, 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.
let ap_id = if page.is_mod_action(context).await? {
page.id_unchecked()
} else {
page.id(expected_domain)?
};
let ap_id = Some(ap_id.clone().into());
let creator = page
.attributed_to
.dereference(context, request_counter)
.await?;
let community = page.extract_community(context, request_counter).await?;
check_is_apub_id_valid(&page.id, community.local, &context.settings())?;
verify_person_in_community(&page.attributed_to, &community, context, request_counter).await?;
let thumbnail_url: Option<Url> = page.image.clone().map(|i| i.url);
let (metadata_res, pictrs_thumbnail) = if let Some(url) = &page.url {
fetch_site_data(context.client(), &context.settings(), Some(url)).await
} else {
(None, thumbnail_url)
};
let (embed_title, embed_description, embed_html) = metadata_res
.map(|u| (u.title, u.description, u.html))
.unwrap_or((None, None, None));
let body_slurs_removed = page
.source
.as_ref()
.map(|s| remove_slurs(&s.content, &context.settings().slur_regex()));
let form = PostForm {
name: page.name.clone(),
url: page.url.clone().map(|u| u.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_html,
thumbnail_url: pictrs_thumbnail.map(|u| u.into()),
ap_id,
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local: Some(false),
};
let post = blocking(context.pool(), move |conn| Post::upsert(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::{file_to_json_object, init_context},
};
use serial_test::serial;
#[actix_rt::test]
#[serial]
async fn test_parse_lemmy_post() {
let context = init_context();
let community = parse_lemmy_community(&context).await;
let person = parse_lemmy_person(&context).await;
let json = file_to_json_object("assets/lemmy/objects/page.json");
let url = Url::parse("https://enterprise.lemmy.ml/post/55143").unwrap();
let mut request_counter = 0;
let post = ApubPost::from_apub(&json, &context, &url, &mut request_counter)
.await
.unwrap();
assert_eq!(post.ap_id.clone().into_inner(), url);
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();
}
}