crates/apub/src/http/mod.rs

   1 use crate::{
   2   activity_lists::SharedInboxActivities,
   3   check_is_apub_id_valid,
   4   context::WithContext,
   5   fetcher::user_or_community::UserOrCommunity,
   6   http::{community::receive_group_inbox, person::receive_person_inbox},
   7   insert_activity,
   8 };
   9 use actix_web::{
  10   web,
  11   web::{Bytes, BytesMut, Payload},
  12   HttpRequest,
  13   HttpResponse,
  14 };
  15 use anyhow::Context;
  16 use futures::StreamExt;
  17 use http::StatusCode;
  18 use lemmy_api_common::blocking;
  19 use lemmy_apub_lib::{
  20   data::Data,
  21   object_id::ObjectId,
  22   signatures::verify_signature,
  23   traits::{ActivityHandler, ActorType},
  24   APUB_JSON_CONTENT_TYPE,
  25 };
  26 use lemmy_db_schema::source::activity::Activity;
  27 use lemmy_utils::{location_info, LemmyError};
  28 use lemmy_websocket::LemmyContext;
  29 use serde::{Deserialize, Serialize};
  30 use std::{fmt::Debug, io::Read};
  31 use tracing::info;
  32 use url::Url;
  33
  34 mod comment;
  35 mod community;
  36 mod person;
  37 mod post;
  38 pub mod routes;
  39
  40 #[tracing::instrument(skip_all)]
  41 pub async fn shared_inbox(
  42   request: HttpRequest,
  43   payload: Payload,
  44   context: web::Data<LemmyContext>,
  45 ) -> Result<HttpResponse, LemmyError> {
  46   let unparsed = payload_to_string(payload).await?;
  47   info!("Received shared inbox activity {}", unparsed);
  48   let activity_data: ActivityCommonFields = serde_json::from_str(&unparsed)?;
  49   let activity = serde_json::from_str::<WithContext<SharedInboxActivities>>(&unparsed)?;
  50   match activity.inner() {
  51     SharedInboxActivities::GroupInboxActivities(g) => {
  52       receive_group_inbox(*g, activity_data, request, &context).await
  53     }
  54     SharedInboxActivities::PersonInboxActivities(p) => {
  55       receive_person_inbox(*p, activity_data, request, &context).await
  56     }
  57   }
  58 }
  59
  60 async fn payload_to_string(mut payload: Payload) -> Result<String, LemmyError> {
  61   let mut bytes = BytesMut::new();
  62   while let Some(item) = payload.next().await {
  63     bytes.extend_from_slice(&item?);
  64   }
  65   let mut unparsed = String::new();
  66   Bytes::from(bytes).as_ref().read_to_string(&mut unparsed)?;
  67   Ok(unparsed)
  68 }
  69
  70 #[derive(Clone, Debug, Deserialize, Serialize)]
  71 #[serde(rename_all = "camelCase")]
  72 pub(crate) struct ActivityCommonFields {
  73   pub(crate) id: Url,
  74   pub(crate) actor: Url,
  75 }
  76
  77 // TODO: move most of this code to library
  78 #[tracing::instrument(skip_all)]
  79 async fn receive_activity<'a, T>(
  80   request: HttpRequest,
  81   activity: T,
  82   activity_data: ActivityCommonFields,
  83   context: &LemmyContext,
  84 ) -> Result<HttpResponse, LemmyError>
  85 where
  86   T: ActivityHandler<DataType = LemmyContext>
  87     + Clone
  88     + Deserialize<'a>
  89     + Serialize
  90     + std::fmt::Debug
  91     + Send
  92     + 'static,
  93 {
  94   check_is_apub_id_valid(&activity_data.actor, false, &context.settings())?;
  95   let request_counter = &mut 0;
  96   let actor = ObjectId::<UserOrCommunity>::new(activity_data.actor)
  97     .dereference(context, context.client(), request_counter)
  98     .await?;
  99   verify_signature(&request, &actor.public_key())?;
 100
 101   info!("Verifying activity {}", activity_data.id.to_string());
 102   activity
 103     .verify(&Data::new(context.clone()), request_counter)
 104     .await?;
 105   assert_activity_not_local(&activity_data.id, &context.settings().hostname)?;
 106
 107   // Log the activity, so we avoid receiving and parsing it twice. Note that this could still happen
 108   // if we receive the same activity twice in very quick succession.
 109   let object_value = serde_json::to_value(&activity)?;
 110   insert_activity(&activity_data.id, object_value, false, true, context.pool()).await?;
 111
 112   info!("Receiving activity {}", activity_data.id.to_string());
 113   activity
 114     .receive(&Data::new(context.clone()), request_counter)
 115     .await?;
 116   Ok(HttpResponse::Ok().finish())
 117 }
 118
 119 /// Convert the data to json and turn it into an HTTP Response with the correct ActivityPub
 120 /// headers.
 121 fn create_apub_response<T>(data: &T) -> HttpResponse
 122 where
 123   T: Serialize,
 124 {
 125   HttpResponse::Ok()
 126     .content_type(APUB_JSON_CONTENT_TYPE)
 127     .json(WithContext::new(data))
 128 }
 129
 130 fn create_json_apub_response(data: serde_json::Value) -> HttpResponse {
 131   HttpResponse::Ok()
 132     .content_type(APUB_JSON_CONTENT_TYPE)
 133     .json(data)
 134 }
 135
 136 fn create_apub_tombstone_response<T>(data: &T) -> HttpResponse
 137 where
 138   T: Serialize,
 139 {
 140   HttpResponse::Gone()
 141     .content_type(APUB_JSON_CONTENT_TYPE)
 142     .status(StatusCode::GONE)
 143     .json(WithContext::new(data))
 144 }
 145
 146 #[derive(Deserialize)]
 147 pub struct ActivityQuery {
 148   type_: String,
 149   id: String,
 150 }
 151
 152 /// Return the ActivityPub json representation of a local activity over HTTP.
 153 #[tracing::instrument(skip_all)]
 154 pub(crate) async fn get_activity(
 155   info: web::Path<ActivityQuery>,
 156   context: web::Data<LemmyContext>,
 157 ) -> Result<HttpResponse, LemmyError> {
 158   let settings = context.settings();
 159   let activity_id = Url::parse(&format!(
 160     "{}/activities/{}/{}",
 161     settings.get_protocol_and_hostname(),
 162     info.type_,
 163     info.id
 164   ))?
 165   .into();
 166   let activity = blocking(context.pool(), move |conn| {
 167     Activity::read_from_apub_id(conn, &activity_id)
 168   })
 169   .await??;
 170
 171   let sensitive = activity.sensitive.unwrap_or(true);
 172   if !activity.local || sensitive {
 173     Ok(HttpResponse::NotFound().finish())
 174   } else {
 175     Ok(create_json_apub_response(activity.data))
 176   }
 177 }
 178
 179 fn assert_activity_not_local(id: &Url, hostname: &str) -> Result<(), LemmyError> {
 180   let activity_domain = id.domain().context(location_info!())?;
 181
 182   if activity_domain == hostname {
 183     let error = LemmyError::from(anyhow::anyhow!(
 184       "Error: received activity which was sent by local instance: {:?}",
 185       id
 186     ));
 187     return Err(error.with_message("received_local_activity"));
 188   }
 189   Ok(())
 190 }