2021-07-17 16:20:44 +00:00
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use crate::{
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generate_moderators_url,
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2021-10-28 15:25:26 +00:00
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insert_activity,
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2022-06-02 14:33:41 +00:00
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local_instance,
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2021-10-18 21:36:44 +00:00
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objects::{community::ApubCommunity, person::ApubPerson},
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2022-06-02 14:33:41 +00:00
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ActorType,
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CONTEXT,
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};
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use activitypub_federation::{
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core::{activity_queue::send_activity, object_id::ObjectId},
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2022-06-02 14:33:41 +00:00
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deser::context::WithContext,
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traits::{ActivityHandler, Actor},
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};
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2021-11-19 17:47:06 +00:00
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use activitystreams_kinds::public;
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2022-03-16 20:11:49 +00:00
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use anyhow::anyhow;
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2022-10-27 09:24:07 +00:00
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use lemmy_db_schema::{
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newtypes::CommunityId,
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source::{community::Community, local_site::LocalSite},
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};
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2022-05-03 17:44:13 +00:00
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use lemmy_db_views_actor::structs::{CommunityPersonBanView, CommunityView};
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2022-06-02 14:33:41 +00:00
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use lemmy_utils::error::LemmyError;
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use lemmy_websocket::LemmyContext;
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2021-10-29 10:32:42 +00:00
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use serde::Serialize;
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2022-06-02 14:33:41 +00:00
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use std::ops::Deref;
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2021-11-23 12:16:47 +00:00
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use tracing::info;
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2021-07-27 22:18:50 +00:00
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use url::{ParseError, Url};
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use uuid::Uuid;
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2021-07-17 16:20:44 +00:00
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2022-02-07 19:23:12 +00:00
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pub mod block;
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pub mod community;
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pub mod create_or_update;
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pub mod deletion;
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pub mod following;
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pub mod voting;
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/// Checks that the specified Url actually identifies a Person (by fetching it), and that the person
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/// doesn't have a site ban.
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2021-12-06 14:54:47 +00:00
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#[tracing::instrument(skip_all)]
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async fn verify_person(
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person_id: &ObjectId<ApubPerson>,
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context: &LemmyContext,
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request_counter: &mut i32,
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) -> Result<(), LemmyError> {
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let person = person_id
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.dereference(context, local_instance(context).await, request_counter)
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.await?;
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if person.banned {
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let err = anyhow!("Person {} is banned", person_id);
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return Err(LemmyError::from_error_message(err, "banned"));
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}
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Ok(())
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}
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2021-07-27 22:18:50 +00:00
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/// Fetches the person and community to verify their type, then checks if person is banned from site
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/// or community.
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#[tracing::instrument(skip_all)]
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pub(crate) async fn verify_person_in_community(
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person_id: &ObjectId<ApubPerson>,
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community: &ApubCommunity,
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context: &LemmyContext,
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request_counter: &mut i32,
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) -> Result<(), LemmyError> {
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let person = person_id
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.dereference(context, local_instance(context).await, request_counter)
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.await?;
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if person.banned {
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return Err(LemmyError::from_message("Person is banned from site"));
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}
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let person_id = person.id;
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let community_id = community.id;
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let is_banned = CommunityPersonBanView::get(context.pool(), person_id, community_id)
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.await
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.is_ok();
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if is_banned {
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return Err(LemmyError::from_message("Person is banned from community"));
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}
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Ok(())
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}
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2022-10-10 15:20:36 +00:00
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/// Verify that mod action in community was performed by a moderator.
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///
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/// * `mod_id` - Activitypub ID of the mod or admin who performed the action
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/// * `object_id` - Activitypub ID of the actor or object that is being moderated
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/// * `community` - The community inside which moderation is happening
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#[tracing::instrument(skip_all)]
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pub(crate) async fn verify_mod_action(
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mod_id: &ObjectId<ApubPerson>,
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object_id: &Url,
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community_id: CommunityId,
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context: &LemmyContext,
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request_counter: &mut i32,
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) -> Result<(), LemmyError> {
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let mod_ = mod_id
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.dereference(context, local_instance(context).await, request_counter)
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.await?;
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2022-11-09 10:05:00 +00:00
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let is_mod_or_admin =
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CommunityView::is_mod_or_admin(context.pool(), mod_.id, community_id).await?;
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if is_mod_or_admin {
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return Ok(());
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}
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2022-10-10 15:20:36 +00:00
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// mod action comes from the same instance as the moderated object, so it was presumably done
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// by an instance admin.
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// TODO: federate instance admin status and check it here
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if mod_id.inner().domain() == object_id.domain() {
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return Ok(());
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}
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Err(LemmyError::from_message("Not a mod"))
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}
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/// For Add/Remove community moderator activities, check that the target field actually contains
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/// /c/community/moderators. Any different values are unsupported.
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fn verify_add_remove_moderator_target(
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target: &Url,
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community: &ApubCommunity,
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) -> Result<(), LemmyError> {
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if target != &generate_moderators_url(&community.actor_id)?.into() {
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return Err(LemmyError::from_message("Unkown target url"));
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}
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Ok(())
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}
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2021-11-06 17:44:34 +00:00
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pub(crate) fn verify_is_public(to: &[Url], cc: &[Url]) -> Result<(), LemmyError> {
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2021-11-16 00:58:15 +00:00
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if ![to, cc].iter().any(|set| set.contains(&public())) {
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return Err(LemmyError::from_message("Object is not public"));
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2021-10-21 17:25:35 +00:00
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}
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Ok(())
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}
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2022-12-01 20:52:49 +00:00
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pub(crate) fn verify_community_matches(
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a: &ApubCommunity,
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b: CommunityId,
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) -> Result<(), LemmyError> {
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if a.id != b {
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return Err(LemmyError::from_message("Invalid community"));
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}
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Ok(())
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}
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2021-10-14 16:33:19 +00:00
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pub(crate) fn check_community_deleted_or_removed(community: &Community) -> Result<(), LemmyError> {
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if community.deleted || community.removed {
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Err(LemmyError::from_message(
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"New post or comment cannot be created in deleted or removed community",
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))
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} else {
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Ok(())
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}
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}
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2021-07-27 22:18:50 +00:00
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/// Generate a unique ID for an activity, in the format:
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/// `http(s)://example.com/receive/create/202daf0a-1489-45df-8d2e-c8a3173fed36`
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2021-09-22 15:57:09 +00:00
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fn generate_activity_id<T>(kind: T, protocol_and_hostname: &str) -> Result<Url, ParseError>
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where
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T: ToString,
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{
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let id = format!(
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"{}/activities/{}/{}",
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protocol_and_hostname,
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kind.to_string().to_lowercase(),
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Uuid::new_v4()
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);
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Url::parse(&id)
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}
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2021-12-06 14:54:47 +00:00
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#[tracing::instrument(skip_all)]
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async fn send_lemmy_activity<Activity, ActorT>(
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context: &LemmyContext,
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activity: Activity,
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actor: &ActorT,
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inbox: Vec<Url>,
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sensitive: bool,
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) -> Result<(), LemmyError>
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where
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Activity: ActivityHandler + Serialize,
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ActorT: Actor + ActorType,
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Activity: ActivityHandler<Error = LemmyError>,
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{
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2022-11-09 10:05:00 +00:00
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let federation_enabled = LocalSite::read(context.pool())
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.await
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.map(|l| l.federation_enabled)
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.unwrap_or(false);
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if !federation_enabled {
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2022-10-17 18:29:18 +00:00
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return Ok(());
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}
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2022-10-27 09:24:07 +00:00
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2022-06-08 15:45:39 +00:00
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info!("Sending activity {}", activity.id().to_string());
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2022-06-02 14:33:41 +00:00
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let activity = WithContext::new(activity, CONTEXT.deref().clone());
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2021-10-28 15:25:26 +00:00
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2021-11-16 02:07:07 +00:00
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let object_value = serde_json::to_value(&activity)?;
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2022-06-08 15:45:39 +00:00
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insert_activity(activity.id(), object_value, true, sensitive, context.pool()).await?;
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send_activity(
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activity,
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actor.get_public_key(),
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actor.private_key().expect("actor has private key"),
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inbox,
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local_instance(context).await,
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)
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2022-06-02 14:33:41 +00:00
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.await?;
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Ok(())
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2021-10-28 15:25:26 +00:00
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}
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