lemmy/crates/apub/src/http/mod.rs

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