mirror of
https://github.com/LemmyNet/lemmy.git
synced 2024-12-04 10:11:21 +00:00
188 lines
5 KiB
Rust
188 lines
5 KiB
Rust
use crate::{
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check_is_apub_id_valid,
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extensions::signatures::verify_signature,
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fetcher::get_or_fetch_and_upsert_actor,
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http::inbox_enums::SharedInboxActivities,
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insert_activity,
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APUB_JSON_CONTENT_TYPE,
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};
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use actix_web::{
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body::Body,
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web,
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web::{Bytes, BytesMut, Payload},
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HttpRequest,
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HttpResponse,
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};
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use anyhow::{anyhow, Context};
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use futures::StreamExt;
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use http::StatusCode;
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use lemmy_api_common::blocking;
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use lemmy_apub_lib::ActivityHandler;
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use lemmy_db_queries::{source::activity::Activity_, DbPool};
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use lemmy_db_schema::source::activity::Activity;
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use lemmy_utils::{location_info, settings::structs::Settings, LemmyError};
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use lemmy_websocket::LemmyContext;
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use serde::{Deserialize, Serialize};
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use std::{fmt::Debug, io::Read};
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use url::Url;
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mod comment;
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mod community;
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mod inbox_enums;
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mod person;
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mod post;
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pub mod routes;
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pub async fn shared_inbox(
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request: HttpRequest,
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payload: Payload,
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context: web::Data<LemmyContext>,
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) -> Result<HttpResponse, LemmyError> {
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let unparsed = payload_to_string(payload).await?;
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receive_activity::<SharedInboxActivities>(request, &unparsed, context).await
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}
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async fn payload_to_string(mut payload: Payload) -> Result<String, LemmyError> {
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let mut bytes = BytesMut::new();
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while let Some(item) = payload.next().await {
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bytes.extend_from_slice(&item?);
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}
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let mut unparsed = String::new();
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Bytes::from(bytes).as_ref().read_to_string(&mut unparsed)?;
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Ok(unparsed)
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}
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// TODO: move most of this code to library
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async fn receive_activity<'a, T>(
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request: HttpRequest,
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activity: &'a str,
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context: web::Data<LemmyContext>,
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) -> Result<HttpResponse, LemmyError>
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where
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T: ActivityHandler + Clone + Deserialize<'a> + Serialize + std::fmt::Debug + Send + 'static,
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{
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let activity = serde_json::from_str::<T>(activity)?;
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let activity_data = activity.common();
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let request_counter = &mut 0;
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let actor =
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get_or_fetch_and_upsert_actor(&activity_data.actor, &context, request_counter).await?;
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verify_signature(&request, &actor.public_key().context(location_info!())?)?;
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// Do nothing if we received the same activity before
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if is_activity_already_known(context.pool(), activity_data.id_unchecked()).await? {
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return Ok(HttpResponse::Ok().finish());
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}
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check_is_apub_id_valid(&activity_data.actor, false)?;
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println!(
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"Verifying activity {}",
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activity_data.id_unchecked().to_string()
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);
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activity.verify(&context, request_counter).await?;
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assert_activity_not_local(&activity)?;
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// Log the activity, so we avoid receiving and parsing it twice. Note that this could still happen
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// if we receive the same activity twice in very quick succession.
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insert_activity(
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activity_data.id_unchecked(),
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activity.clone(),
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false,
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true,
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context.pool(),
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)
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.await?;
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println!(
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"Receiving activity {}",
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activity_data.id_unchecked().to_string()
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);
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activity.receive(&context, request_counter).await?;
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Ok(HttpResponse::Ok().finish())
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}
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/// Convert the data to json and turn it into an HTTP Response with the correct ActivityPub
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/// headers.
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fn create_apub_response<T>(data: &T) -> HttpResponse<Body>
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where
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T: Serialize,
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{
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HttpResponse::Ok()
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.content_type(APUB_JSON_CONTENT_TYPE)
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.json(data)
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}
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fn create_apub_tombstone_response<T>(data: &T) -> HttpResponse<Body>
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where
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T: Serialize,
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{
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HttpResponse::Gone()
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.content_type(APUB_JSON_CONTENT_TYPE)
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.status(StatusCode::GONE)
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.json(data)
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}
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#[derive(Deserialize)]
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pub struct ActivityQuery {
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type_: String,
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id: String,
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}
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/// Return the ActivityPub json representation of a local activity over HTTP.
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pub(crate) async fn get_activity(
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info: web::Path<ActivityQuery>,
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context: web::Data<LemmyContext>,
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) -> Result<HttpResponse<Body>, LemmyError> {
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let settings = Settings::get();
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let activity_id = Url::parse(&format!(
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"{}/activities/{}/{}",
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settings.get_protocol_and_hostname(),
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info.type_,
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info.id
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))?
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.into();
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let activity = blocking(context.pool(), move |conn| {
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Activity::read_from_apub_id(conn, &activity_id)
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})
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.await??;
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let sensitive = activity.sensitive.unwrap_or(true);
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if !activity.local || sensitive {
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Ok(HttpResponse::NotFound().finish())
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} else {
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Ok(create_apub_response(&activity.data))
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}
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}
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pub(crate) async fn is_activity_already_known(
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pool: &DbPool,
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activity_id: &Url,
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) -> Result<bool, LemmyError> {
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let activity_id = activity_id.to_owned().into();
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let existing = blocking(pool, move |conn| {
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Activity::read_from_apub_id(conn, &activity_id)
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})
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.await?;
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match existing {
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Ok(_) => Ok(true),
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Err(_) => Ok(false),
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}
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}
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fn assert_activity_not_local<T: Debug + ActivityHandler>(activity: &T) -> Result<(), LemmyError> {
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let activity_domain = activity
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.common()
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.id_unchecked()
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.domain()
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.context(location_info!())?;
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if activity_domain == Settings::get().hostname {
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return Err(
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anyhow!(
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"Error: received activity which was sent by local instance: {:?}",
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activity
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)
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.into(),
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);
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}
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Ok(())
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}
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