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Allow for remote mods to remove posts/comments

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This commit is contained in:
Felix Ableitner 2021-03-11 17:21:45 +01:00
parent 3ffae1f5b8
commit a2698dea92
6 changed files with 117 additions and 70 deletions
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15
crates/apub/src/activities/receive/community.rs
View file

@ -1,4 +1,7 @@
use crate::{activities::receive::verify_activity_domains_valid, inbox::is_addressed_to_public};
use crate::{
activities::receive::verify_activity_domains_valid,
inbox::verify_is_addressed_to_public,
};
use activitystreams::{
activity::{ActorAndObjectRefExt, Delete, Remove, Undo},
base::{AnyBase, ExtendsExt},
@ -47,7 +50,7 @@ pub(crate) async fn receive_remove_community(
) -> Result<(), LemmyError> {
let remove = Remove::from_any_base(activity)?.context(location_info!())?;
verify_activity_domains_valid(&remove, expected_domain, true)?;
is_addressed_to_public(&remove)?;
verify_is_addressed_to_public(&remove)?;
let community_uri = remove
.object()
@ -89,11 +92,11 @@ pub(crate) async fn receive_undo_delete_community(
community: Community,
expected_domain: &Url,
) -> Result<(), LemmyError> {
is_addressed_to_public(&undo)?;
verify_is_addressed_to_public(&undo)?;
let inner = undo.object().to_owned().one().context(location_info!())?;
let delete = Delete::from_any_base(inner)?.context(location_info!())?;
verify_activity_domains_valid(&delete, expected_domain, true)?;
is_addressed_to_public(&delete)?;
verify_is_addressed_to_public(&delete)?;
let deleted_community = blocking(context.pool(), move |conn| {
Community::update_deleted(conn, community.id, false)
@ -124,12 +127,12 @@ pub(crate) async fn receive_undo_remove_community(
undo: Undo,
expected_domain: &Url,
) -> Result<(), LemmyError> {
is_addressed_to_public(&undo)?;
verify_is_addressed_to_public(&undo)?;
let inner = undo.object().to_owned().one().context(location_info!())?;
let remove = Remove::from_any_base(inner)?.context(location_info!())?;
verify_activity_domains_valid(&remove, &expected_domain, true)?;
is_addressed_to_public(&remove)?;
verify_is_addressed_to_public(&remove)?;
let community_uri = remove
.object()

6
crates/apub/src/activities/send/community.rs
View file

@ -219,7 +219,8 @@ pub async fn send_add_mod(
add
.set_many_contexts(lemmy_context()?)
.set_id(generate_activity_id(AddType::Add)?)
.set_many_tos(vec![community.actor_id.to_owned().into_inner(), public()])
.set_to(public())
.set_many_ccs(vec![community.actor_id()])
.set_target(generate_moderators_url(&community.actor_id)?.into_inner());
if community.local {
@ -245,7 +246,8 @@ pub async fn send_remove_mod(
remove
.set_many_contexts(lemmy_context()?)
.set_id(generate_activity_id(RemoveType::Remove)?)
.set_many_tos(vec![community.actor_id.to_owned().into_inner(), public()])
.set_to(public())
.set_many_ccs(vec![community.actor_id()])
.set_target(generate_moderators_url(&community.actor_id)?.into_inner());
if community.local {

8
crates/apub/src/inbox/community_inbox.rs
View file

@ -6,7 +6,6 @@ use crate::{
get_activity_to_and_cc,
inbox_verify_http_signature,
is_activity_already_known,
is_addressed_to_public,
receive_for_community::{
receive_add_for_community,
receive_create_for_community,
@ -17,6 +16,7 @@ use crate::{
receive_undo_for_community,
receive_update_for_community,
},
verify_is_addressed_to_public,
},
insert_activity,
ActorType,
@ -164,18 +164,18 @@ pub(crate) async fn community_receive_message(
true
}
CommunityValidTypes::Add => {
receive_add_for_community(context, any_base.clone(), &actor_url, request_counter).await?;
receive_add_for_community(context, any_base.clone(), None, request_counter).await?;
true
}
CommunityValidTypes::Remove => {
receive_remove_for_community(context, any_base.clone(), &actor_url, request_counter).await?;
receive_remove_for_community(context, any_base.clone(), None, request_counter).await?;
true
}
};
if do_announce {
// Check again that the activity is public, just to be sure
is_addressed_to_public(&activity)?;
verify_is_addressed_to_public(&activity)?;
to_community
.send_announce(activity.into_any_base()?, context)
.await?;

2
crates/apub/src/inbox/mod.rs
View file

@ -84,7 +84,7 @@ where
to_and_cc
}
pub(crate) fn is_addressed_to_public<T, Kind>(activity: &T) -> Result<(), LemmyError>
pub(crate) fn verify_is_addressed_to_public<T, Kind>(activity: &T) -> Result<(), LemmyError>
where
T: AsBase<Kind> + AsObject<Kind> + ActorAndObjectRefExt,
{

144
crates/apub/src/inbox/receive_for_community.rs
View file

@ -36,7 +36,8 @@ use crate::{
user::get_or_fetch_and_upsert_user,
},
find_post_or_comment_by_id,
inbox::is_addressed_to_public,
generate_moderators_url,
inbox::verify_is_addressed_to_public,
ActorType,
PostOrComment,
};
@ -44,6 +45,7 @@ use activitystreams::{
activity::{
ActorAndObjectRef,
Add,
Announce,
Create,
Delete,
Dislike,
@ -54,6 +56,7 @@ use activitystreams::{
Update,
},
base::AnyBase,
object::AsObject,
prelude::*,
};
use anyhow::{anyhow, Context};
@ -92,7 +95,7 @@ pub(in crate::inbox) async fn receive_create_for_community(
) -> Result<(), LemmyError> {
let create = Create::from_any_base(activity)?.context(location_info!())?;
verify_activity_domains_valid(&create, &expected_domain, true)?;
is_addressed_to_public(&create)?;
verify_is_addressed_to_public(&create)?;
let kind = create
.object()
@ -114,7 +117,7 @@ pub(in crate::inbox) async fn receive_update_for_community(
) -> Result<(), LemmyError> {
let update = Update::from_any_base(activity)?.context(location_info!())?;
verify_activity_domains_valid(&update, &expected_domain, true)?;
is_addressed_to_public(&update)?;
verify_is_addressed_to_public(&update)?;
let kind = update
.object()
@ -136,7 +139,7 @@ pub(in crate::inbox) async fn receive_like_for_community(
) -> Result<(), LemmyError> {
let like = Like::from_any_base(activity)?.context(location_info!())?;
verify_activity_domains_valid(&like, &expected_domain, false)?;
is_addressed_to_public(&like)?;
verify_is_addressed_to_public(&like)?;
let object_id = like
.object()
@ -167,7 +170,7 @@ pub(in crate::inbox) async fn receive_dislike_for_community(
let dislike = Dislike::from_any_base(activity)?.context(location_info!())?;
verify_activity_domains_valid(&dislike, &expected_domain, false)?;
is_addressed_to_public(&dislike)?;
verify_is_addressed_to_public(&dislike)?;
let object_id = dislike
.object()
@ -191,7 +194,7 @@ pub(in crate::inbox) async fn receive_delete_for_community(
) -> Result<(), LemmyError> {
let delete = Delete::from_any_base(activity)?.context(location_info!())?;
verify_activity_domains_valid(&delete, &expected_domain, true)?;
is_addressed_to_public(&delete)?;
verify_is_addressed_to_public(&delete)?;
let object = delete
.object()
@ -210,18 +213,18 @@ pub(in crate::inbox) async fn receive_delete_for_community(
/// A post or comment being removed by a mod/admin
pub(in crate::inbox) async fn receive_remove_for_community(
context: &LemmyContext,
activity: AnyBase,
expected_domain: &Url,
remove_any_base: AnyBase,
announce: Option<Announce>,
request_counter: &mut i32,
) -> Result<(), LemmyError> {
let remove = Remove::from_any_base(activity.to_owned())?.context(location_info!())?;
verify_activity_domains_valid(&remove, &expected_domain, false)?;
is_addressed_to_public(&remove)?;
let remove = Remove::from_any_base(remove_any_base.to_owned())?.context(location_info!())?;
let community = extract_community_from_cc(&remove, context).await?;
verify_mod_activity(&remove, announce, &community, context).await?;
verify_is_addressed_to_public(&remove)?;
verify_actor_is_community_mod(&remove, &community, context).await?;
// Remove a moderator from community
if remove.target().is_some() {
let community = verify_actor_is_community_mod(&remove, context).await?;
let remove_mod = remove
.object()
.as_single_xsd_any_uri()
@ -235,32 +238,18 @@ pub(in crate::inbox) async fn receive_remove_for_community(
CommunityModerator::leave(conn, &form)
})
.await??;
community.send_announce(activity, context).await?;
community.send_announce(remove_any_base, context).await?;
// TODO: send websocket notification about removed mod
Ok(())
}
// Remove a post or comment
else {
let cc = remove
.cc()
.map(|c| c.as_many())
.flatten()
.context(location_info!())?;
let community_id = cc
.first()
.map(|c| c.as_xsd_any_uri())
.flatten()
.context(location_info!())?;
let object = remove
.object()
.to_owned()
.single_xsd_any_uri()
.context(location_info!())?;
// Ensure that remove activity comes from the same domain as the community
remove.id(community_id.domain().context(location_info!())?)?;
match find_post_or_comment_by_id(context, object).await {
Ok(PostOrComment::Post(p)) => receive_remove_post(context, remove, *p).await,
Ok(PostOrComment::Comment(c)) => receive_remove_comment(context, remove, *c).await,
@ -287,7 +276,7 @@ pub(in crate::inbox) async fn receive_undo_for_community(
) -> Result<(), LemmyError> {
let undo = Undo::from_any_base(activity)?.context(location_info!())?;
verify_activity_domains_valid(&undo, &expected_domain.to_owned(), true)?;
is_addressed_to_public(&undo)?;
verify_is_addressed_to_public(&undo)?;
use UndoableActivities::*;
match undo
@ -316,7 +305,7 @@ pub(in crate::inbox) async fn receive_undo_delete_for_community(
let delete = Delete::from_any_base(undo.object().to_owned().one().context(location_info!())?)?
.context(location_info!())?;
verify_activity_domains_valid(&delete, &expected_domain, true)?;
is_addressed_to_public(&delete)?;
verify_is_addressed_to_public(&delete)?;
let object = delete
.object()
@ -340,7 +329,7 @@ pub(in crate::inbox) async fn receive_undo_remove_for_community(
let remove = Remove::from_any_base(undo.object().to_owned().one().context(location_info!())?)?
.context(location_info!())?;
verify_activity_domains_valid(&remove, &expected_domain, false)?;
is_addressed_to_public(&remove)?;
verify_is_addressed_to_public(&remove)?;
let object = remove
.object()
@ -365,7 +354,7 @@ pub(in crate::inbox) async fn receive_undo_like_for_community(
let like = Like::from_any_base(undo.object().to_owned().one().context(location_info!())?)?
.context(location_info!())?;
verify_activity_domains_valid(&like, &expected_domain, false)?;
is_addressed_to_public(&like)?;
verify_is_addressed_to_public(&like)?;
let object_id = like
.object()
@ -384,14 +373,17 @@ pub(in crate::inbox) async fn receive_undo_like_for_community(
/// Add a new mod to the community (can only be done by an existing mod).
pub(in crate::inbox) async fn receive_add_for_community(
context: &LemmyContext,
activity: AnyBase,
expected_domain: &Url,
add_any_base: AnyBase,
announce: Option<Announce>,
request_counter: &mut i32,
) -> Result<(), LemmyError> {
let add = Add::from_any_base(activity.to_owned())?.context(location_info!())?;
verify_activity_domains_valid(&add, &expected_domain, false)?;
is_addressed_to_public(&add)?;
let community = verify_actor_is_community_mod(&add, context).await?;
let add = Add::from_any_base(add_any_base.to_owned())?.context(location_info!())?;
let community = extract_community_from_cc(&add, context).await?;
verify_mod_activity(&add, announce, &community, context).await?;
verify_is_addressed_to_public(&add)?;
verify_actor_is_community_mod(&add, &community, context).await?;
verify_add_remove_moderator_target(&add, &community)?;
let new_mod = add
.object()
@ -417,7 +409,7 @@ pub(in crate::inbox) async fn receive_add_for_community(
.await??;
}
if community.local {
community.send_announce(activity, context).await?;
community.send_announce(add_any_base, context).await?;
}
// TODO: send websocket notification about added mod
Ok(())
@ -433,7 +425,7 @@ pub(in crate::inbox) async fn receive_undo_dislike_for_community(
let dislike = Dislike::from_any_base(undo.object().to_owned().one().context(location_info!())?)?
.context(location_info!())?;
verify_activity_domains_valid(&dislike, &expected_domain, false)?;
is_addressed_to_public(&dislike)?;
verify_is_addressed_to_public(&dislike)?;
let object_id = dislike
.object()
@ -465,26 +457,39 @@ async fn fetch_post_or_comment_by_id(
Err(NotFound.into())
}
async fn verify_actor_is_community_mod<T, Kind>(
async fn extract_community_from_cc<T, Kind>(
activity: &T,
context: &LemmyContext,
) -> Result<Community, LemmyError>
where
T: ActorAndObjectRef + BaseExt<Kind> + OptTargetRef,
T: AsObject<Kind>,
{
// should be the moderators collection of a local community
let target = activity
.target()
.map(|t| t.as_single_xsd_any_uri())
let cc = activity
.cc()
.map(|c| c.as_many())
.flatten()
.context(location_info!())?;
// TODO: very hacky, we should probably store the moderators url in db
let community_id: DbUrl = Url::parse(&target.to_string().replace("/moderators", ""))?.into();
let community_id = cc
.first()
.map(|c| c.as_xsd_any_uri())
.flatten()
.context(location_info!())?;
let community_id: DbUrl = community_id.to_owned().into();
let community = blocking(&context.pool(), move |conn| {
Community::read_from_apub_id(&conn, &community_id)
})
.await??;
Ok(community)
}
async fn verify_actor_is_community_mod<T, Kind>(
activity: &T,
community: &Community,
context: &LemmyContext,
) -> Result<(), LemmyError>
where
T: ActorAndObjectRef + BaseExt<Kind>,
{
let actor = activity
.actor()?
.as_single_xsd_any_uri()
@ -507,6 +512,43 @@ where
return Err(anyhow!("Not a mod").into());
}
// TODO: the function name doesnt make sense if we return the community
Ok(community)
Ok(())
}
async fn verify_mod_activity<T, Kind>(
mod_action: &T,
announce: Option<Announce>,
community: &Community,
context: &LemmyContext,
) -> Result<(), LemmyError>
where
T: ActorAndObjectRef + OptTargetRef + BaseExt<Kind>,
{
// Remove was sent by community to user, we just check that it came from the right domain
if let Some(announce) = announce {
verify_activity_domains_valid(&announce, &community.actor_id.to_owned().into(), false)?;
}
// Remove was sent by a remote mod to community, check that they are actually mod
else {
verify_actor_is_community_mod(mod_action, community, context).await?;
}
Ok(())
}
fn verify_add_remove_moderator_target<T, Kind>(
activity: &T,
community: &Community,
) -> Result<(), LemmyError>
where
T: ActorAndObjectRef + BaseExt<Kind> + OptTargetRef,
{
let target = activity
.target()
.map(|t| t.as_single_xsd_any_uri())
.flatten()
.context(location_info!())?;
if target != &generate_moderators_url(&community.actor_id)?.into_inner() {
return Err(anyhow!("Unkown target url").into());
}
Ok(())
}

12
crates/apub/src/inbox/user_inbox.rs
View file

@ -26,7 +26,6 @@ use crate::{
is_activity_already_known,
is_addressed_to_community_followers,
is_addressed_to_local_user,
is_addressed_to_public,
receive_for_community::{
receive_add_for_community,
receive_create_for_community,
@ -37,6 +36,7 @@ use crate::{
receive_undo_for_community,
receive_update_for_community,
},
verify_is_addressed_to_public,
},
insert_activity,
ActorType,
@ -265,7 +265,7 @@ pub async fn receive_announce(
) -> Result<(), LemmyError> {
let announce = Announce::from_any_base(activity)?.context(location_info!())?;
verify_activity_domains_valid(&announce, &actor.actor_id(), false)?;
is_addressed_to_public(&announce)?;
verify_is_addressed_to_public(&announce)?;
let kind = announce
.object()
@ -299,13 +299,13 @@ pub async fn receive_announce(
}
Some(Delete) => receive_delete_for_community(context, inner_activity, &inner_id).await,
Some(Remove) => {
receive_remove_for_community(context, inner_activity, &inner_id, request_counter).await
receive_remove_for_community(context, inner_activity, Some(announce), request_counter).await
}
Some(Undo) => {
receive_undo_for_community(context, inner_activity, &inner_id, request_counter).await
}
Some(Add) => {
receive_add_for_community(context, inner_activity, &inner_id, request_counter).await
receive_add_for_community(context, inner_activity, Some(announce), request_counter).await
}
_ => receive_unhandled_activity(inner_activity),
}
@ -319,7 +319,7 @@ async fn receive_create(
) -> Result<(), LemmyError> {
let create = Create::from_any_base(activity)?.context(location_info!())?;
verify_activity_domains_valid(&create, &expected_domain, true)?;
if is_addressed_to_public(&create).is_ok() {
if verify_is_addressed_to_public(&create).is_ok() {
receive_create_comment(create, context, request_counter).await
} else {
receive_create_private_message(&context, create, expected_domain, request_counter).await
@ -334,7 +334,7 @@ async fn receive_update(
) -> Result<(), LemmyError> {
let update = Update::from_any_base(activity)?.context(location_info!())?;
verify_activity_domains_valid(&update, &expected_domain, true)?;
if is_addressed_to_public(&update).is_ok() {
if verify_is_addressed_to_public(&update).is_ok() {
receive_update_comment(update, context, request_counter).await
} else {
receive_update_private_message(&context, update, expected_domain, request_counter).await