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

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use crate::{
activities::{extract_community, verify_person_in_community},
context::lemmy_context,
fetcher::object_id::ObjectId,
objects::{create_tombstone, person::ApubPerson, ImageObject, Source},
};
use activitystreams::{
base::AnyBase,
object::{
kind::{ImageType, PageType},
Tombstone,
},
primitives::OneOrMany,
public,
unparsed::Unparsed,
};
use chrono::{DateTime, FixedOffset, NaiveDateTime};
use lemmy_api_common::blocking;
use lemmy_apub_lib::{
traits::{ActorType, ApubObject, FromApub, ToApub},
values::{MediaTypeHtml, MediaTypeMarkdown},
verify::verify_domains_match,
};
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,
DbPool,
};
use lemmy_utils::{
request::fetch_site_data,
utils::{check_slurs, convert_datetime, markdown_to_html, remove_slurs},
LemmyError,
};
use lemmy_websocket::LemmyContext;
use serde::{Deserialize, Serialize};
use serde_with::skip_serializing_none;
use std::ops::Deref;
use url::Url;
#[skip_serializing_none]
#[derive(Clone, Debug, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct Page {
#[serde(rename = "@context")]
context: OneOrMany<AnyBase>,
r#type: PageType,
id: Url,
pub(crate) attributed_to: ObjectId<ApubPerson>,
to: [Url; 2],
name: String,
content: Option<String>,
media_type: MediaTypeHtml,
source: Option<Source>,
url: Option<Url>,
image: Option<ImageObject>,
pub(crate) comments_enabled: Option<bool>,
sensitive: Option<bool>,
pub(crate) stickied: Option<bool>,
published: DateTime<FixedOffset>,
updated: Option<DateTime<FixedOffset>>,
#[serde(flatten)]
unparsed: Unparsed,
}
impl Page {
pub(crate) fn id_unchecked(&self) -> &Url {
&self.id
}
pub(crate) fn id(&self, expected_domain: &Url) -> Result<&Url, LemmyError> {
verify_domains_match(&self.id, expected_domain)?;
Ok(&self.id)
}
/// Only mods can change the post's stickied/locked status. So if either of these is changed from
/// the current value, it is a mod action and needs to be verified as such.
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///
/// Both stickied and locked need to be false on a newly created post (verified in [[CreatePost]].
pub(crate) async fn is_mod_action(&self, context: &LemmyContext) -> Result<bool, LemmyError> {
let old_post = ObjectId::<ApubPost>::new(self.id.clone())
.dereference_local(context)
.await;
let is_mod_action = if let Ok(old_post) = old_post {
self.stickied != Some(old_post.stickied) || self.comments_enabled != Some(!old_post.locked)
} else {
false
};
Ok(is_mod_action)
}
pub(crate) async fn verify(
&self,
context: &LemmyContext,
request_counter: &mut i32,
) -> Result<(), LemmyError> {
let community = extract_community(&self.to, context, request_counter).await?;
check_slurs(&self.name, &context.settings().slur_regex())?;
verify_domains_match(self.attributed_to.inner(), &self.id.clone())?;
verify_person_in_community(
&self.attributed_to,
&ObjectId::new(community.actor_id()),
context,
request_counter,
)
.await?;
Ok(())
}
}
#[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;
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(())
}
}
#[async_trait::async_trait(?Send)]
impl ToApub for ApubPost {
type ApubType = Page;
type TombstoneType = Tombstone;
type DataType = DbPool;
// Turn a Lemmy post into an ActivityPub page that can be sent out over the network.
async fn to_apub(&self, pool: &DbPool) -> Result<Page, LemmyError> {
let creator_id = self.creator_id;
let creator = blocking(pool, move |conn| Person::read(conn, creator_id)).await??;
let community_id = self.community_id;
let community = blocking(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 {
context: lemmy_context(),
r#type: PageType::Page,
id: self.ap_id.clone().into(),
attributed_to: ObjectId::new(creator.actor_id),
to: [community.actor_id.into(), public()],
name: self.name.clone(),
content: self.body.as_ref().map(|b| markdown_to_html(b)),
media_type: 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: convert_datetime(self.published),
updated: self.updated.map(convert_datetime),
unparsed: Default::default(),
};
Ok(page)
}
fn to_tombstone(&self) -> Result<Tombstone, LemmyError> {
create_tombstone(
self.deleted,
self.ap_id.to_owned().into(),
self.updated,
PageType::Page,
)
}
}
#[async_trait::async_trait(?Send)]
impl FromApub for ApubPost {
type ApubType = Page;
type DataType = LemmyContext;
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 = extract_community(&page.to, 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: Some(page.published.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())
}
}