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

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use crate::{
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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::{
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objects::{
page::{Attachment, AttributedTo, Page, PageType},
LanguageTag,
},
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,
language::Language,
moderator::{ModLockPost, ModLockPostForm, ModStickyPost, ModStickyPostForm},
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person::Person,
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post::{Post, PostForm},
},
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traits::Crud,
};
use lemmy_utils::{
error::LemmyError,
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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<Post> for ApubPost {
fn from(p: Post) -> Self {
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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<NaiveDateTime> {
None
}
#[tracing::instrument(skip_all)]
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),
)
}
#[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<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 language = self.language_id;
let language = blocking(context.pool(), move |conn| {
Language::read_from_id(conn, language)
})
.await??;
let page = Page {
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kind: PageType::Page,
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id: ObjectId::new(self.ap_id.clone()),
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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)),
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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),
language: LanguageTag::new(language),
published: Some(convert_datetime(self.published)),
updated: self.updated.map(convert_datetime),
};
Ok(page)
}
#[tracing::instrument(skip_all)]
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async fn verify(
page: &Page,
expected_domain: &Url,
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context: &LemmyContext,
request_counter: &mut i32,
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) -> 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.
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if !page.is_mod_action(context).await? {
verify_domains_match(page.id.inner(), expected_domain)?;
verify_is_remote_object(page.id.inner(), context.settings())?;
};
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let community = page.extract_community(context, request_counter).await?;
check_apub_id_valid_with_strictness(page.id.inner(), community.local, context.settings())?;
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verify_person_in_community(&page.creator()?, &community, context, request_counter).await?;
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check_slurs(&page.name, &context.settings().slur_regex())?;
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verify_domains_match(page.creator()?.inner(), page.id.inner())?;
verify_is_public(&page.to, &page.cc)?;
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Ok(())
}
#[tracing::instrument(skip_all)]
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async fn from_apub(
page: Page,
context: &LemmyContext,
request_counter: &mut i32,
) -> Result<ApubPost, LemmyError> {
let creator = page
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.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(),
})
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} 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 {
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// 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();
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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())));
let language = page.language.map(|l| l.identifier);
let language = blocking(context.pool(), move |conn| {
Language::read_id_from_code_opt(conn, language.as_deref())
})
.await??;
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),
language_id: language,
}
} 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::<ApubPost>::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 conn = &mut context.pool().get().unwrap();
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;
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ApubPost::verify(&json, &url, &context, &mut request_counter)
.await
.unwrap();
let post = ApubPost::from_apub(json, &context, &mut request_counter)
.await
.unwrap();
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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(conn, post.id).unwrap();
Person::delete(conn, person.id).unwrap();
Community::delete(conn, community.id).unwrap();
Site::delete(conn, site.id).unwrap();
}
}