use crate::{ check_community_or_site_ban, check_is_apub_id_valid, fetcher::object_id::ObjectId, generate_moderators_url, }; use anyhow::anyhow; use lemmy_api_common::blocking; use lemmy_apub_lib::{traits::ActivityFields, verify::verify_domains_match}; use lemmy_db_schema::source::{community::Community, person::Person}; use lemmy_db_views_actor::community_view::CommunityView; use lemmy_utils::{settings::structs::Settings, LemmyError}; use lemmy_websocket::LemmyContext; use serde::{Deserialize, Serialize}; use strum_macros::ToString; use url::{ParseError, Url}; use uuid::Uuid; pub mod comment; pub mod community; pub mod deletion; pub mod following; pub mod post; pub mod private_message; pub mod undo_remove; pub mod voting; #[derive(Clone, Debug, ToString, Deserialize, Serialize)] pub enum CreateOrUpdateType { Create, Update, } /// Checks that the specified Url actually identifies a Person (by fetching it), and that the person /// doesn't have a site ban. async fn verify_person( person_id: &ObjectId, context: &LemmyContext, request_counter: &mut i32, ) -> Result<(), LemmyError> { let person = person_id.dereference(context, request_counter).await?; if person.banned { return Err(anyhow!("Person {} is banned", person_id).into()); } Ok(()) } pub(crate) async fn extract_community( cc: &[Url], context: &LemmyContext, request_counter: &mut i32, ) -> Result { let mut cc_iter = cc.iter(); loop { if let Some(cid) = cc_iter.next() { let cid = ObjectId::new(cid.clone()); if let Ok(c) = cid.dereference(context, request_counter).await { break Ok(c); } } else { return Err(anyhow!("No community found in cc").into()); } } } /// Fetches the person and community to verify their type, then checks if person is banned from site /// or community. pub(crate) async fn verify_person_in_community( person_id: &ObjectId, community_id: &ObjectId, context: &LemmyContext, request_counter: &mut i32, ) -> Result<(), LemmyError> { let community = community_id.dereference(context, request_counter).await?; let person = person_id.dereference(context, request_counter).await?; check_community_or_site_ban(&person, community.id, context.pool()).await } /// Simply check that the url actually refers to a valid group. async fn verify_community( community_id: &ObjectId, context: &LemmyContext, request_counter: &mut i32, ) -> Result<(), LemmyError> { community_id.dereference(context, request_counter).await?; Ok(()) } fn verify_activity(activity: &dyn ActivityFields, settings: &Settings) -> Result<(), LemmyError> { check_is_apub_id_valid(activity.actor(), false, settings)?; verify_domains_match(activity.id_unchecked(), activity.actor())?; Ok(()) } /// Verify that the actor is a community mod. This check is only run if the community is local, /// because in case of remote communities, admins can also perform mod actions. As admin status /// is not federated, we cant verify their actions remotely. pub(crate) async fn verify_mod_action( actor_id: &ObjectId, community_id: ObjectId, context: &LemmyContext, request_counter: &mut i32, ) -> Result<(), LemmyError> { let community = community_id.dereference_local(context).await?; if community.local { let actor = actor_id.dereference(context, request_counter).await?; // Note: this will also return true for admins in addition to mods, but as we dont know about // remote admins, it doesnt make any difference. let community_id = community.id; let actor_id = actor.id; let is_mod_or_admin = blocking(context.pool(), move |conn| { CommunityView::is_mod_or_admin(conn, actor_id, community_id) }) .await?; if !is_mod_or_admin { return Err(anyhow!("Not a mod").into()); } } Ok(()) } /// For Add/Remove community moderator activities, check that the target field actually contains /// /c/community/moderators. Any different values are unsupported. fn verify_add_remove_moderator_target( target: &Url, community: &ObjectId, ) -> Result<(), LemmyError> { if target != &generate_moderators_url(&community.clone().into())?.into_inner() { return Err(anyhow!("Unkown target url").into()); } Ok(()) } pub(crate) fn check_community_deleted_or_removed(community: &Community) -> Result<(), LemmyError> { if community.deleted || community.removed { Err(anyhow!("New post or comment cannot be created in deleted or removed community").into()) } else { Ok(()) } } /// Generate a unique ID for an activity, in the format: /// `http(s)://example.com/receive/create/202daf0a-1489-45df-8d2e-c8a3173fed36` fn generate_activity_id(kind: T, protocol_and_hostname: &str) -> Result where T: ToString, { let id = format!( "{}/activities/{}/{}", protocol_and_hostname, kind.to_string().to_lowercase(), Uuid::new_v4() ); Url::parse(&id) }