lemmy/server/src/apub/post.rs

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use crate::{
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api::check_slurs,
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apub::{
activities::{generate_activity_id, send_activity_to_community},
check_actor_domain,
create_apub_response,
create_apub_tombstone_response,
create_tombstone,
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extensions::page_extension::PageExtension,
fetcher::{get_or_fetch_and_upsert_community, get_or_fetch_and_upsert_user},
ActorType,
ApubLikeableType,
ApubObjectType,
FromApub,
PageExt,
ToApub,
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},
blocking,
DbPool,
LemmyContext,
LemmyError,
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};
use activitystreams::{
activity::{
kind::{CreateType, DeleteType, DislikeType, LikeType, RemoveType, UndoType, UpdateType},
Create,
Delete,
Dislike,
Like,
Remove,
Undo,
Update,
},
object::{kind::PageType, Image, Object, Page, Tombstone},
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prelude::*,
public,
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};
use activitystreams_ext::Ext1;
use actix_web::{body::Body, web, HttpResponse};
use anyhow::Context;
use lemmy_db::{
community::Community,
post::{Post, PostForm},
user::User_,
Crud,
};
use lemmy_utils::{convert_datetime, location_info, remove_slurs};
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use serde::Deserialize;
use url::Url;
#[derive(Deserialize)]
pub struct PostQuery {
post_id: String,
}
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/// Return the post json over HTTP.
pub async fn get_apub_post(
info: web::Path<PostQuery>,
context: web::Data<LemmyContext>,
) -> Result<HttpResponse<Body>, LemmyError> {
let id = info.post_id.parse::<i32>()?;
let post = blocking(context.pool(), move |conn| Post::read(conn, id)).await??;
if !post.deleted {
Ok(create_apub_response(&post.to_apub(context.pool()).await?))
} else {
Ok(create_apub_tombstone_response(&post.to_tombstone()?))
}
}
#[async_trait::async_trait(?Send)]
impl ToApub for Post {
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type Response = PageExt;
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// Turn a Lemmy post into an ActivityPub page that can be sent out over the network.
async fn to_apub(&self, pool: &DbPool) -> Result<PageExt, LemmyError> {
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let mut page = Page::new();
let creator_id = self.creator_id;
let creator = blocking(pool, move |conn| User_::read(conn, creator_id)).await??;
let community_id = self.community_id;
let community = blocking(pool, move |conn| Community::read(conn, community_id)).await??;
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page
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// Not needed when the Post is embedded in a collection (like for community outbox)
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// TODO: need to set proper context defining sensitive/commentsEnabled fields
// https://git.asonix.dog/Aardwolf/activitystreams/issues/5
.set_context(activitystreams::context())
.set_id(self.ap_id.parse::<Url>()?)
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// Use summary field to be consistent with mastodon content warning.
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// https://mastodon.xyz/@Louisa/103987265222901387.json
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.set_summary(self.name.to_owned())
.set_published(convert_datetime(self.published))
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.set_to(community.actor_id)
.set_attributed_to(creator.actor_id);
if let Some(body) = &self.body {
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page.set_content(body.to_owned());
}
// TODO: hacky code because we get self.url == Some("")
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// https://github.com/LemmyNet/lemmy/issues/602
let url = self.url.as_ref().filter(|u| !u.is_empty());
if let Some(u) = url {
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page.set_url(u.to_owned());
// Embeds
let mut page_preview = Page::new();
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page_preview.set_url(u.to_owned());
if let Some(embed_title) = &self.embed_title {
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page_preview.set_name(embed_title.to_owned());
}
if let Some(embed_description) = &self.embed_description {
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page_preview.set_summary(embed_description.to_owned());
}
if let Some(embed_html) = &self.embed_html {
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page_preview.set_content(embed_html.to_owned());
}
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page.set_preview(page_preview.into_any_base()?);
}
if let Some(thumbnail_url) = &self.thumbnail_url {
let mut image = Image::new();
image.set_url(thumbnail_url.to_string());
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page.set_image(image.into_any_base()?);
}
if let Some(u) = self.updated {
page.set_updated(convert_datetime(u));
}
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let ext = PageExtension {
comments_enabled: !self.locked,
sensitive: self.nsfw,
stickied: self.stickied,
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};
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Ok(Ext1::new(page, ext))
}
fn to_tombstone(&self) -> Result<Tombstone, LemmyError> {
create_tombstone(self.deleted, &self.ap_id, self.updated, PageType::Page)
}
}
struct EmbedType {
title: Option<String>,
description: Option<String>,
html: Option<String>,
}
fn extract_embed_from_apub(
page: &Ext1<Object<PageType>, PageExtension>,
) -> Result<EmbedType, LemmyError> {
match page.inner.preview() {
Some(preview) => {
let preview_page = Page::from_any_base(preview.one().context(location_info!())?.to_owned())?
.context(location_info!())?;
let title = preview_page
.name()
.map(|n| n.one())
.flatten()
.map(|s| s.as_xsd_string())
.flatten()
.map(|s| s.to_string());
let description = preview_page
.summary()
.map(|s| s.as_single_xsd_string())
.flatten()
.map(|s| s.to_string());
let html = preview_page
.content()
.map(|c| c.as_single_xsd_string())
.flatten()
.map(|s| s.to_string());
Ok(EmbedType {
title,
description,
html,
})
}
None => Ok(EmbedType {
title: None,
description: None,
html: None,
}),
}
}
#[async_trait::async_trait(?Send)]
impl FromApub for PostForm {
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type ApubType = PageExt;
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/// Parse an ActivityPub page received from another instance into a Lemmy post.
async fn from_apub(
page: &PageExt,
context: &LemmyContext,
expected_domain: Option<Url>,
) -> Result<PostForm, LemmyError> {
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let ext = &page.ext_one;
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let creator_actor_id = page
.inner
.attributed_to()
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.as_ref()
.context(location_info!())?
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.as_single_xsd_any_uri()
.context(location_info!())?;
let creator = get_or_fetch_and_upsert_user(creator_actor_id, context).await?;
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let community_actor_id = page
.inner
.to()
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.as_ref()
.context(location_info!())?
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.as_single_xsd_any_uri()
.context(location_info!())?;
let community = get_or_fetch_and_upsert_community(community_actor_id, context).await?;
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let thumbnail_url = match &page.inner.image() {
Some(any_image) => Image::from_any_base(
any_image
.to_owned()
.as_one()
.context(location_info!())?
.to_owned(),
)?
.context(location_info!())?
.url()
.context(location_info!())?
.as_single_xsd_any_uri()
.map(|u| u.to_string()),
None => None,
};
let embed = extract_embed_from_apub(page)?;
let name = page
.inner
.summary()
.as_ref()
.context(location_info!())?
.as_single_xsd_string()
.context(location_info!())?
.to_string();
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let url = page
.inner
.url()
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.as_ref()
.map(|u| u.as_single_xsd_string())
.flatten()
.map(|s| s.to_string());
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let body = page
.inner
.content()
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.as_ref()
.map(|c| c.as_single_xsd_string())
.flatten()
.map(|s| s.to_string());
check_slurs(&name)?;
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let body_slurs_removed = body.map(|b| remove_slurs(&b));
Ok(PostForm {
name,
url,
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body: body_slurs_removed,
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creator_id: creator.id,
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community_id: community.id,
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removed: None,
locked: Some(!ext.comments_enabled),
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published: page
.inner
.published()
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.as_ref()
.map(|u| u.to_owned().naive_local()),
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updated: page
.inner
.updated()
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.as_ref()
.map(|u| u.to_owned().naive_local()),
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deleted: None,
nsfw: ext.sensitive,
stickied: Some(ext.stickied),
embed_title: embed.title,
embed_description: embed.description,
embed_html: embed.html,
thumbnail_url,
ap_id: check_actor_domain(page, expected_domain)?,
local: false,
})
}
}
#[async_trait::async_trait(?Send)]
impl ApubObjectType for Post {
/// Send out information about a newly created post, to the followers of the community.
async fn send_create(&self, creator: &User_, context: &LemmyContext) -> Result<(), LemmyError> {
let page = self.to_apub(context.pool()).await?;
let community_id = self.community_id;
let community = blocking(context.pool(), move |conn| {
Community::read(conn, community_id)
})
.await??;
let mut create = Create::new(creator.actor_id.to_owned(), page.into_any_base()?);
create
.set_context(activitystreams::context())
.set_id(generate_activity_id(CreateType::Create)?)
.set_to(public())
.set_many_ccs(vec![community.get_followers_url()?]);
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send_activity_to_community(
creator,
&community,
vec![community.get_shared_inbox_url()?],
create.into_any_base()?,
context,
)
.await?;
Ok(())
}
/// Send out information about an edited post, to the followers of the community.
async fn send_update(&self, creator: &User_, context: &LemmyContext) -> Result<(), LemmyError> {
let page = self.to_apub(context.pool()).await?;
let community_id = self.community_id;
let community = blocking(context.pool(), move |conn| {
Community::read(conn, community_id)
})
.await??;
let mut update = Update::new(creator.actor_id.to_owned(), page.into_any_base()?);
update
.set_context(activitystreams::context())
.set_id(generate_activity_id(UpdateType::Update)?)
.set_to(public())
.set_many_ccs(vec![community.get_followers_url()?]);
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send_activity_to_community(
creator,
&community,
vec![community.get_shared_inbox_url()?],
update.into_any_base()?,
context,
)
.await?;
Ok(())
}
async fn send_delete(&self, creator: &User_, context: &LemmyContext) -> Result<(), LemmyError> {
let page = self.to_apub(context.pool()).await?;
let community_id = self.community_id;
let community = blocking(context.pool(), move |conn| {
Community::read(conn, community_id)
})
.await??;
let mut delete = Delete::new(creator.actor_id.to_owned(), page.into_any_base()?);
delete
.set_context(activitystreams::context())
.set_id(generate_activity_id(DeleteType::Delete)?)
.set_to(public())
.set_many_ccs(vec![community.get_followers_url()?]);
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send_activity_to_community(
creator,
&community,
vec![community.get_shared_inbox_url()?],
delete.into_any_base()?,
context,
)
.await?;
Ok(())
}
async fn send_undo_delete(
&self,
creator: &User_,
context: &LemmyContext,
) -> Result<(), LemmyError> {
let page = self.to_apub(context.pool()).await?;
let community_id = self.community_id;
let community = blocking(context.pool(), move |conn| {
Community::read(conn, community_id)
})
.await??;
let mut delete = Delete::new(creator.actor_id.to_owned(), page.into_any_base()?);
delete
.set_context(activitystreams::context())
.set_id(generate_activity_id(DeleteType::Delete)?)
.set_to(public())
.set_many_ccs(vec![community.get_followers_url()?]);
// Undo that fake activity
let mut undo = Undo::new(creator.actor_id.to_owned(), delete.into_any_base()?);
undo
.set_context(activitystreams::context())
.set_id(generate_activity_id(UndoType::Undo)?)
.set_to(public())
.set_many_ccs(vec![community.get_followers_url()?]);
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send_activity_to_community(
creator,
&community,
vec![community.get_shared_inbox_url()?],
undo.into_any_base()?,
context,
)
.await?;
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Ok(())
}
async fn send_remove(&self, mod_: &User_, context: &LemmyContext) -> Result<(), LemmyError> {
let page = self.to_apub(context.pool()).await?;
let community_id = self.community_id;
let community = blocking(context.pool(), move |conn| {
Community::read(conn, community_id)
})
.await??;
let mut remove = Remove::new(mod_.actor_id.to_owned(), page.into_any_base()?);
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remove
.set_context(activitystreams::context())
.set_id(generate_activity_id(RemoveType::Remove)?)
.set_to(public())
.set_many_ccs(vec![community.get_followers_url()?]);
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send_activity_to_community(
mod_,
&community,
vec![community.get_shared_inbox_url()?],
remove.into_any_base()?,
context,
)
.await?;
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Ok(())
}
async fn send_undo_remove(&self, mod_: &User_, context: &LemmyContext) -> Result<(), LemmyError> {
let page = self.to_apub(context.pool()).await?;
let community_id = self.community_id;
let community = blocking(context.pool(), move |conn| {
Community::read(conn, community_id)
})
.await??;
let mut remove = Remove::new(mod_.actor_id.to_owned(), page.into_any_base()?);
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remove
.set_context(activitystreams::context())
.set_id(generate_activity_id(RemoveType::Remove)?)
.set_to(public())
.set_many_ccs(vec![community.get_followers_url()?]);
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// Undo that fake activity
let mut undo = Undo::new(mod_.actor_id.to_owned(), remove.into_any_base()?);
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undo
.set_context(activitystreams::context())
.set_id(generate_activity_id(UndoType::Undo)?)
.set_to(public())
.set_many_ccs(vec![community.get_followers_url()?]);
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send_activity_to_community(
mod_,
&community,
vec![community.get_shared_inbox_url()?],
undo.into_any_base()?,
context,
)
.await?;
Ok(())
}
}
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#[async_trait::async_trait(?Send)]
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impl ApubLikeableType for Post {
async fn send_like(&self, creator: &User_, context: &LemmyContext) -> Result<(), LemmyError> {
let page = self.to_apub(context.pool()).await?;
let community_id = self.community_id;
let community = blocking(context.pool(), move |conn| {
Community::read(conn, community_id)
})
.await??;
let mut like = Like::new(creator.actor_id.to_owned(), page.into_any_base()?);
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like
.set_context(activitystreams::context())
.set_id(generate_activity_id(LikeType::Like)?)
.set_to(public())
.set_many_ccs(vec![community.get_followers_url()?]);
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send_activity_to_community(
&creator,
&community,
vec![community.get_shared_inbox_url()?],
like.into_any_base()?,
context,
)
.await?;
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Ok(())
}
async fn send_dislike(&self, creator: &User_, context: &LemmyContext) -> Result<(), LemmyError> {
let page = self.to_apub(context.pool()).await?;
let community_id = self.community_id;
let community = blocking(context.pool(), move |conn| {
Community::read(conn, community_id)
})
.await??;
let mut dislike = Dislike::new(creator.actor_id.to_owned(), page.into_any_base()?);
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dislike
.set_context(activitystreams::context())
.set_id(generate_activity_id(DislikeType::Dislike)?)
.set_to(public())
.set_many_ccs(vec![community.get_followers_url()?]);
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send_activity_to_community(
&creator,
&community,
vec![community.get_shared_inbox_url()?],
dislike.into_any_base()?,
context,
)
.await?;
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Ok(())
}
async fn send_undo_like(
&self,
creator: &User_,
context: &LemmyContext,
) -> Result<(), LemmyError> {
let page = self.to_apub(context.pool()).await?;
let community_id = self.community_id;
let community = blocking(context.pool(), move |conn| {
Community::read(conn, community_id)
})
.await??;
let mut like = Like::new(creator.actor_id.to_owned(), page.into_any_base()?);
like
.set_context(activitystreams::context())
.set_id(generate_activity_id(LikeType::Like)?)
.set_to(public())
.set_many_ccs(vec![community.get_followers_url()?]);
// Undo that fake activity
let mut undo = Undo::new(creator.actor_id.to_owned(), like.into_any_base()?);
undo
.set_context(activitystreams::context())
.set_id(generate_activity_id(UndoType::Undo)?)
.set_to(public())
.set_many_ccs(vec![community.get_followers_url()?]);
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send_activity_to_community(
&creator,
&community,
vec![community.get_shared_inbox_url()?],
undo.into_any_base()?,
context,
)
.await?;
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Ok(())
}
}