use crate::{check_is_apub_id_valid, fetcher::person::get_or_fetch_and_upsert_person}; use activitystreams::{ base::{AsBase, BaseExt, ExtendsExt}, markers::Base, mime::{FromStrError, Mime}, object::{ApObjectExt, Object, ObjectExt, Tombstone, TombstoneExt}, }; use anyhow::{anyhow, Context}; use chrono::NaiveDateTime; use lemmy_api_common::blocking; use lemmy_apub_lib::values::MediaTypeMarkdown; use lemmy_db_queries::{ApubObject, Crud, DbPool}; use lemmy_db_schema::DbUrl; use lemmy_utils::{ location_info, settings::structs::Settings, utils::{convert_datetime, markdown_to_html}, LemmyError, }; use lemmy_websocket::LemmyContext; use url::Url; pub(crate) mod comment; pub(crate) mod community; pub(crate) mod person; pub(crate) mod post; pub(crate) mod private_message; /// Trait for converting an object or actor into the respective ActivityPub type. #[async_trait::async_trait(?Send)] pub trait ToApub { type ApubType; async fn to_apub(&self, pool: &DbPool) -> Result; fn to_tombstone(&self) -> Result; } #[async_trait::async_trait(?Send)] pub trait FromApub { type ApubType; /// Converts an object from ActivityPub type to Lemmy internal type. /// /// * `apub` The object to read from /// * `context` LemmyContext which holds DB pool, HTTP client etc /// * `expected_domain` Domain where the object was received from. None in case of mod action. /// * `mod_action_allowed` True if the object can be a mod activity, ignore `expected_domain` in this case async fn from_apub( apub: &Self::ApubType, context: &LemmyContext, expected_domain: Url, request_counter: &mut i32, mod_action_allowed: bool, ) -> Result where Self: Sized; } #[async_trait::async_trait(?Send)] pub trait FromApubToForm { async fn from_apub( apub: &ApubType, context: &LemmyContext, expected_domain: Url, request_counter: &mut i32, mod_action_allowed: bool, ) -> Result where Self: Sized; } #[derive(Clone, Debug, serde::Deserialize, serde::Serialize)] #[serde(rename_all = "camelCase")] pub struct Source { content: String, media_type: MediaTypeMarkdown, } /// Updated is actually the deletion time fn create_tombstone( deleted: bool, object_id: Url, updated: Option, former_type: T, ) -> Result where T: ToString, { if deleted { if let Some(updated) = updated { let mut tombstone = Tombstone::new(); tombstone.set_id(object_id); tombstone.set_former_type(former_type.to_string()); tombstone.set_deleted(convert_datetime(updated)); Ok(tombstone) } else { Err(anyhow!("Cant convert to tombstone because updated time was None.").into()) } } else { Err(anyhow!("Cant convert object to tombstone if it wasnt deleted").into()) } } pub(in crate::objects) fn check_object_domain( apub: &T, expected_domain: Url, use_strict_allowlist: bool, ) -> Result where T: Base + AsBase, { let domain = expected_domain.domain().context(location_info!())?; let object_id = apub.id(domain)?.context(location_info!())?; check_is_apub_id_valid(object_id, use_strict_allowlist)?; Ok(object_id.to_owned().into()) } pub(in crate::objects) fn set_content_and_source( object: &mut T, markdown_text: &str, ) -> Result<(), LemmyError> where T: ApObjectExt + ObjectExt + AsBase, { let mut source = Object::<()>::new_none_type(); source .set_content(markdown_text) .set_media_type(mime_markdown()?); object.set_source(source.into_any_base()?); object.set_content(markdown_to_html(markdown_text)); object.set_media_type(mime_html()?); Ok(()) } pub(in crate::objects) fn get_source_markdown_value( object: &T, ) -> Result, LemmyError> where T: ApObjectExt + ObjectExt + AsBase, { let content = object .content() .map(|s| s.as_single_xsd_string().map(|s2| s2.to_string())) .flatten(); if content.is_some() { let source = object.source().context(location_info!())?; let source = Object::<()>::from_any_base(source.to_owned())?.context(location_info!())?; check_is_markdown(source.media_type())?; let source_content = source .content() .map(|s| s.as_single_xsd_string().map(|s2| s2.to_string())) .flatten() .context(location_info!())?; return Ok(Some(source_content)); } Ok(None) } fn mime_markdown() -> Result { "text/markdown".parse() } fn mime_html() -> Result { "text/html".parse() } pub(in crate::objects) fn check_is_markdown(mime: Option<&Mime>) -> Result<(), LemmyError> { let mime = mime.context(location_info!())?; if !mime.eq(&mime_markdown()?) { Err(LemmyError::from(anyhow!( "Lemmy only supports markdown content" ))) } else { Ok(()) } } /// Converts an ActivityPub object (eg `Note`) to a database object (eg `Comment`). If an object /// with the same ActivityPub ID already exists in the database, it is returned directly. Otherwise /// the apub object is parsed, inserted and returned. pub async fn get_object_from_apub( from: &From, context: &LemmyContext, expected_domain: Url, request_counter: &mut i32, is_mod_action: bool, ) -> Result where From: BaseExt, To: ApubObject + Crud + Send + 'static, ToForm: FromApubToForm + Send + 'static, { let object_id = from.id_unchecked().context(location_info!())?.to_owned(); let domain = object_id.domain().context(location_info!())?; // if its a local object, return it directly from the database if Settings::get().hostname() == domain { let object = blocking(context.pool(), move |conn| { To::read_from_apub_id(conn, &object_id.into()) }) .await??; Ok(object) } // otherwise parse and insert, assuring that it comes from the right domain else { let to_form = ToForm::from_apub( from, context, expected_domain, request_counter, is_mod_action, ) .await?; let to = blocking(context.pool(), move |conn| To::upsert(conn, &to_form)).await??; Ok(to) } }