lemmy/server/src/apub/comment.rs

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use crate::{
apub::{
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activities::{populate_object_props, send_activity_to_community},
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create_apub_response,
create_apub_tombstone_response,
create_tombstone,
fetch_webfinger_url,
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fetcher::get_or_fetch_and_upsert_remote_user,
ActorType,
ApubLikeableType,
ApubObjectType,
FromApub,
ToApub,
},
convert_datetime,
db::{
comment::{Comment, CommentForm},
community::Community,
post::Post,
user::User_,
Crud,
},
routes::DbPoolParam,
scrape_text_for_mentions,
MentionData,
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};
use activitystreams::{
activity::{Create, Delete, Dislike, Like, Remove, Undo, Update},
context,
link::Mention,
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object::{kind::NoteType, properties::ObjectProperties, Note},
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};
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use activitystreams_new::object::Tombstone;
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use actix_web::{body::Body, web::Path, HttpResponse, Result};
use diesel::PgConnection;
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use failure::Error;
use itertools::Itertools;
use log::debug;
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use serde::Deserialize;
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#[derive(Deserialize)]
pub struct CommentQuery {
comment_id: String,
}
/// Return the post json over HTTP.
pub async fn get_apub_comment(
info: Path<CommentQuery>,
db: DbPoolParam,
) -> Result<HttpResponse<Body>, Error> {
let id = info.comment_id.parse::<i32>()?;
let comment = Comment::read(&&db.get()?, id)?;
if !comment.deleted {
Ok(create_apub_response(&comment.to_apub(&db.get().unwrap())?))
} else {
Ok(create_apub_tombstone_response(&comment.to_tombstone()?))
}
}
impl ToApub for Comment {
type Response = Note;
fn to_apub(&self, conn: &PgConnection) -> Result<Note, Error> {
let mut comment = Note::default();
let oprops: &mut ObjectProperties = comment.as_mut();
let creator = User_::read(&conn, self.creator_id)?;
let post = Post::read(&conn, self.post_id)?;
let community = Community::read(&conn, post.community_id)?;
// Add a vector containing some important info to the "in_reply_to" field
// [post_ap_id, Option(parent_comment_ap_id)]
let mut in_reply_to_vec = vec![post.ap_id];
if let Some(parent_id) = self.parent_id {
let parent_comment = Comment::read(&conn, parent_id)?;
in_reply_to_vec.push(parent_comment.ap_id);
}
oprops
// Not needed when the Post is embedded in a collection (like for community outbox)
.set_context_xsd_any_uri(context())?
.set_id(self.ap_id.to_owned())?
.set_published(convert_datetime(self.published))?
.set_to_xsd_any_uri(community.actor_id)?
.set_many_in_reply_to_xsd_any_uris(in_reply_to_vec)?
.set_content_xsd_string(self.content.to_owned())?
.set_attributed_to_xsd_any_uri(creator.actor_id)?;
if let Some(u) = self.updated {
oprops.set_updated(convert_datetime(u))?;
}
Ok(comment)
}
fn to_tombstone(&self) -> Result<Tombstone, Error> {
create_tombstone(
self.deleted,
&self.ap_id,
self.updated,
NoteType.to_string(),
)
}
}
impl FromApub for CommentForm {
type ApubType = Note;
/// Parse an ActivityPub note received from another instance into a Lemmy comment
fn from_apub(note: &Note, conn: &PgConnection) -> Result<CommentForm, Error> {
let oprops = &note.object_props;
let creator_actor_id = &oprops.get_attributed_to_xsd_any_uri().unwrap().to_string();
let creator = get_or_fetch_and_upsert_remote_user(&creator_actor_id, &conn)?;
let mut in_reply_tos = oprops.get_many_in_reply_to_xsd_any_uris().unwrap();
let post_ap_id = in_reply_tos.next().unwrap().to_string();
// The 2nd item, if it exists, is the parent comment apub_id
let parent_id: Option<i32> = match in_reply_tos.next() {
Some(parent_comment_uri) => {
let parent_comment_uri_str = &parent_comment_uri.to_string();
let parent_comment = Comment::read_from_apub_id(&conn, &parent_comment_uri_str)?;
Some(parent_comment.id)
}
None => None,
};
// TODO this failed because a mention on a post that wasn't on this server yet. Has to do with
// fetching replytos
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dbg!(&post_ap_id);
let post = Post::read_from_apub_id(&conn, &post_ap_id)?;
Ok(CommentForm {
creator_id: creator.id,
post_id: post.id,
parent_id,
content: oprops
.get_content_xsd_string()
.map(|c| c.to_string())
.unwrap(),
removed: None,
read: None,
published: oprops
.get_published()
.map(|u| u.as_ref().to_owned().naive_local()),
updated: oprops
.get_updated()
.map(|u| u.as_ref().to_owned().naive_local()),
deleted: None,
ap_id: oprops.get_id().unwrap().to_string(),
local: false,
})
}
}
impl ApubObjectType for Comment {
/// Send out information about a newly created comment, to the followers of the community.
fn send_create(&self, creator: &User_, conn: &PgConnection) -> Result<(), Error> {
let note = self.to_apub(conn)?;
let post = Post::read(&conn, self.post_id)?;
let community = Community::read(conn, post.community_id)?;
let id = format!("{}/create/{}", self.ap_id, uuid::Uuid::new_v4());
let maa: MentionsAndAddresses =
collect_non_local_mentions_and_addresses(&conn, &self.content, &community)?;
let mut create = Create::new();
populate_object_props(&mut create.object_props, maa.addressed_ccs, &id)?;
// Set the mention tags
create.object_props.set_many_tag_base_boxes(maa.tags)?;
create
.create_props
.set_actor_xsd_any_uri(creator.actor_id.to_owned())?
.set_object_base_box(note)?;
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send_activity_to_community(&creator, &conn, &community, maa.inboxes, create)?;
Ok(())
}
/// Send out information about an edited post, to the followers of the community.
fn send_update(&self, creator: &User_, conn: &PgConnection) -> Result<(), Error> {
let note = self.to_apub(&conn)?;
let post = Post::read(&conn, self.post_id)?;
let community = Community::read(&conn, post.community_id)?;
let id = format!("{}/update/{}", self.ap_id, uuid::Uuid::new_v4());
let maa: MentionsAndAddresses =
collect_non_local_mentions_and_addresses(&conn, &self.content, &community)?;
let mut update = Update::new();
populate_object_props(&mut update.object_props, maa.addressed_ccs, &id)?;
// Set the mention tags
update.object_props.set_many_tag_base_boxes(maa.tags)?;
update
.update_props
.set_actor_xsd_any_uri(creator.actor_id.to_owned())?
.set_object_base_box(note)?;
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send_activity_to_community(&creator, &conn, &community, maa.inboxes, update)?;
Ok(())
}
fn send_delete(&self, creator: &User_, conn: &PgConnection) -> Result<(), Error> {
let note = self.to_apub(&conn)?;
let post = Post::read(&conn, self.post_id)?;
let community = Community::read(&conn, post.community_id)?;
let id = format!("{}/delete/{}", self.ap_id, uuid::Uuid::new_v4());
let mut delete = Delete::default();
populate_object_props(
&mut delete.object_props,
vec![community.get_followers_url()],
&id,
)?;
delete
.delete_props
.set_actor_xsd_any_uri(creator.actor_id.to_owned())?
.set_object_base_box(note)?;
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send_activity_to_community(
&creator,
&conn,
&community,
vec![community.get_shared_inbox_url()],
delete,
)?;
Ok(())
}
fn send_undo_delete(&self, creator: &User_, conn: &PgConnection) -> Result<(), Error> {
let note = self.to_apub(&conn)?;
let post = Post::read(&conn, self.post_id)?;
let community = Community::read(&conn, post.community_id)?;
// Generate a fake delete activity, with the correct object
let id = format!("{}/delete/{}", self.ap_id, uuid::Uuid::new_v4());
let mut delete = Delete::default();
populate_object_props(
&mut delete.object_props,
vec![community.get_followers_url()],
&id,
)?;
delete
.delete_props
.set_actor_xsd_any_uri(creator.actor_id.to_owned())?
.set_object_base_box(note)?;
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// TODO
// Undo that fake activity
let undo_id = format!("{}/undo/delete/{}", self.ap_id, uuid::Uuid::new_v4());
let mut undo = Undo::default();
populate_object_props(
&mut undo.object_props,
vec![community.get_followers_url()],
&undo_id,
)?;
undo
.undo_props
.set_actor_xsd_any_uri(creator.actor_id.to_owned())?
.set_object_base_box(delete)?;
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send_activity_to_community(
&creator,
&conn,
&community,
vec![community.get_shared_inbox_url()],
undo,
)?;
Ok(())
}
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fn send_remove(&self, mod_: &User_, conn: &PgConnection) -> Result<(), Error> {
let note = self.to_apub(&conn)?;
let post = Post::read(&conn, self.post_id)?;
let community = Community::read(&conn, post.community_id)?;
let id = format!("{}/remove/{}", self.ap_id, uuid::Uuid::new_v4());
let mut remove = Remove::default();
populate_object_props(
&mut remove.object_props,
vec![community.get_followers_url()],
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&id,
)?;
remove
.remove_props
.set_actor_xsd_any_uri(mod_.actor_id.to_owned())?
.set_object_base_box(note)?;
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send_activity_to_community(
&mod_,
&conn,
&community,
vec![community.get_shared_inbox_url()],
remove,
)?;
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Ok(())
}
fn send_undo_remove(&self, mod_: &User_, conn: &PgConnection) -> Result<(), Error> {
let note = self.to_apub(&conn)?;
let post = Post::read(&conn, self.post_id)?;
let community = Community::read(&conn, post.community_id)?;
// Generate a fake delete activity, with the correct object
let id = format!("{}/remove/{}", self.ap_id, uuid::Uuid::new_v4());
let mut remove = Remove::default();
populate_object_props(
&mut remove.object_props,
vec![community.get_followers_url()],
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&id,
)?;
remove
.remove_props
.set_actor_xsd_any_uri(mod_.actor_id.to_owned())?
.set_object_base_box(note)?;
// Undo that fake activity
let undo_id = format!("{}/undo/remove/{}", self.ap_id, uuid::Uuid::new_v4());
let mut undo = Undo::default();
populate_object_props(
&mut undo.object_props,
vec![community.get_followers_url()],
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&undo_id,
)?;
undo
.undo_props
.set_actor_xsd_any_uri(mod_.actor_id.to_owned())?
.set_object_base_box(remove)?;
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send_activity_to_community(
&mod_,
&conn,
&community,
vec![community.get_shared_inbox_url()],
undo,
)?;
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Ok(())
}
}
impl ApubLikeableType for Comment {
fn send_like(&self, creator: &User_, conn: &PgConnection) -> Result<(), Error> {
let note = self.to_apub(&conn)?;
let post = Post::read(&conn, self.post_id)?;
let community = Community::read(&conn, post.community_id)?;
let id = format!("{}/like/{}", self.ap_id, uuid::Uuid::new_v4());
let mut like = Like::new();
populate_object_props(
&mut like.object_props,
vec![community.get_followers_url()],
&id,
)?;
like
.like_props
.set_actor_xsd_any_uri(creator.actor_id.to_owned())?
.set_object_base_box(note)?;
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send_activity_to_community(
&creator,
&conn,
&community,
vec![community.get_shared_inbox_url()],
like,
)?;
Ok(())
}
fn send_dislike(&self, creator: &User_, conn: &PgConnection) -> Result<(), Error> {
let note = self.to_apub(&conn)?;
let post = Post::read(&conn, self.post_id)?;
let community = Community::read(&conn, post.community_id)?;
let id = format!("{}/dislike/{}", self.ap_id, uuid::Uuid::new_v4());
let mut dislike = Dislike::new();
populate_object_props(
&mut dislike.object_props,
vec![community.get_followers_url()],
&id,
)?;
dislike
.dislike_props
.set_actor_xsd_any_uri(creator.actor_id.to_owned())?
.set_object_base_box(note)?;
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send_activity_to_community(
&creator,
&conn,
&community,
vec![community.get_shared_inbox_url()],
dislike,
)?;
Ok(())
}
fn send_undo_like(&self, creator: &User_, conn: &PgConnection) -> Result<(), Error> {
let note = self.to_apub(&conn)?;
let post = Post::read(&conn, self.post_id)?;
let community = Community::read(&conn, post.community_id)?;
let id = format!("{}/dislike/{}", self.ap_id, uuid::Uuid::new_v4());
let mut like = Like::new();
populate_object_props(
&mut like.object_props,
vec![community.get_followers_url()],
&id,
)?;
like
.like_props
.set_actor_xsd_any_uri(creator.actor_id.to_owned())?
.set_object_base_box(note)?;
// TODO
// Undo that fake activity
let undo_id = format!("{}/undo/like/{}", self.ap_id, uuid::Uuid::new_v4());
let mut undo = Undo::default();
populate_object_props(
&mut undo.object_props,
vec![community.get_followers_url()],
&undo_id,
)?;
undo
.undo_props
.set_actor_xsd_any_uri(creator.actor_id.to_owned())?
.set_object_base_box(like)?;
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send_activity_to_community(
&creator,
&conn,
&community,
vec![community.get_shared_inbox_url()],
undo,
)?;
Ok(())
}
}
struct MentionsAndAddresses {
addressed_ccs: Vec<String>,
inboxes: Vec<String>,
tags: Vec<Mention>,
}
/// This takes a comment, and builds a list of to_addresses, inboxes,
/// and mention tags, so they know where to be sent to.
/// Addresses are the users / addresses that go in the cc field.
fn collect_non_local_mentions_and_addresses(
conn: &PgConnection,
content: &str,
community: &Community,
) -> Result<MentionsAndAddresses, Error> {
let mut addressed_ccs = vec![community.get_followers_url()];
// Add the mention tag
let mut tags = Vec::new();
// Get the inboxes for any mentions
let mentions = scrape_text_for_mentions(&content)
.into_iter()
// Filter only the non-local ones
.filter(|m| !m.is_local())
.collect::<Vec<MentionData>>();
let mut mention_inboxes = Vec::new();
for mention in &mentions {
// TODO should it be fetching it every time?
if let Ok(actor_id) = fetch_webfinger_url(mention) {
debug!("mention actor_id: {}", actor_id);
addressed_ccs.push(actor_id.to_owned());
let mention_user = get_or_fetch_and_upsert_remote_user(&actor_id, &conn)?;
let shared_inbox = mention_user.get_shared_inbox_url();
mention_inboxes.push(shared_inbox);
let mut mention_tag = Mention::new();
mention_tag
.link_props
.set_href(actor_id)?
.set_name_xsd_string(mention.full_name())?;
tags.push(mention_tag);
}
}
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let mut inboxes = vec![community.get_shared_inbox_url()];
inboxes.extend(mention_inboxes);
inboxes = inboxes.into_iter().unique().collect();
Ok(MentionsAndAddresses {
addressed_ccs,
inboxes,
tags,
})
}