lemmy/crates/apub/src/lib.rs

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Rust
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use crate::fetcher::post_or_comment::PostOrComment;
use anyhow::Context;
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use lemmy_api_common::blocking;
use lemmy_db_schema::{newtypes::DbUrl, source::activity::Activity, DbPool};
use lemmy_utils::{location_info, settings::structs::Settings, LemmyError};
use serde::{Deserialize, Deserializer};
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use std::net::IpAddr;
use url::{ParseError, Url};
pub mod activities;
pub(crate) mod activity_lists;
pub(crate) mod collections;
mod context;
pub mod fetcher;
pub mod http;
pub(crate) mod mentions;
pub mod migrations;
pub mod objects;
pub mod protocol;
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/// Checks if the ID is allowed for sending or receiving.
///
/// In particular, it checks for:
/// - federation being enabled (if its disabled, only local URLs are allowed)
/// - the correct scheme (either http or https)
/// - URL being in the allowlist (if it is active)
/// - URL not being in the blocklist (if it is active)
///
/// `use_strict_allowlist` should be true only when parsing a remote community, or when parsing a
/// post/comment in a local community.
#[tracing::instrument(skip(settings))]
pub(crate) fn check_is_apub_id_valid(
apub_id: &Url,
use_strict_allowlist: bool,
settings: &Settings,
) -> Result<(), LemmyError> {
let domain = apub_id.domain().context(location_info!())?.to_string();
let local_instance = settings.get_hostname_without_port()?;
if !settings.federation.enabled {
return if domain == local_instance {
Ok(())
} else {
let error = LemmyError::from(anyhow::anyhow!(
"Trying to connect with {}, but federation is disabled",
domain
));
Err(error.with_message("federation_disabled"))
};
}
let host = apub_id.host_str().context(location_info!())?;
let host_as_ip = host.parse::<IpAddr>();
if host == "localhost" || host_as_ip.is_ok() {
let error = LemmyError::from(anyhow::anyhow!("invalid hostname {}: {}", host, apub_id));
return Err(error.with_message("invalid_hostname"));
}
if apub_id.scheme() != settings.get_protocol_string() {
let error = LemmyError::from(anyhow::anyhow!(
"invalid apub id scheme {}: {}",
apub_id.scheme(),
apub_id
));
return Err(error.with_message("invalid_scheme"));
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}
// TODO: might be good to put the part above in one method, and below in another
// (which only gets called in apub::objects)
// -> no that doesnt make sense, we still need the code below for blocklist and strict allowlist
if let Some(blocked) = settings.to_owned().federation.blocked_instances {
if blocked.contains(&domain) {
let error = LemmyError::from(anyhow::anyhow!("{} is in federation blocklist", domain));
return Err(error.with_message("federation_blocked"));
}
}
if let Some(mut allowed) = settings.to_owned().federation.allowed_instances {
// Only check allowlist if this is a community, or strict allowlist is enabled.
let strict_allowlist = settings.to_owned().federation.strict_allowlist;
if use_strict_allowlist || strict_allowlist {
// need to allow this explicitly because apub receive might contain objects from our local
// instance.
allowed.push(local_instance);
if !allowed.contains(&domain) {
let error = LemmyError::from(anyhow::anyhow!("{} not in federation allowlist", domain));
return Err(error.with_message("federation_not_allowed"));
}
}
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}
Ok(())
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}
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pub(crate) fn deserialize_one_or_many<'de, T, D>(deserializer: D) -> Result<Vec<T>, D::Error>
where
T: Deserialize<'de>,
D: Deserializer<'de>,
{
#[derive(Deserialize)]
#[serde(untagged)]
enum OneOrMany<T> {
One(T),
Many(Vec<T>),
}
let result: OneOrMany<T> = Deserialize::deserialize(deserializer)?;
Ok(match result {
OneOrMany::Many(list) => list,
OneOrMany::One(value) => vec![value],
})
}
pub(crate) fn deserialize_one<'de, T, D>(deserializer: D) -> Result<[T; 1], D::Error>
where
T: Deserialize<'de>,
D: Deserializer<'de>,
{
#[derive(Deserialize)]
#[serde(untagged)]
enum MaybeArray<T> {
Simple(T),
Array([T; 1]),
}
let result: MaybeArray<T> = Deserialize::deserialize(deserializer)?;
Ok(match result {
MaybeArray::Simple(value) => [value],
MaybeArray::Array(value) => value,
})
}
pub enum EndpointType {
Community,
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Person,
Post,
Comment,
PrivateMessage,
}
/// Generates an apub endpoint for a given domain, IE xyz.tld
pub fn generate_local_apub_endpoint(
endpoint_type: EndpointType,
name: &str,
domain: &str,
) -> Result<DbUrl, ParseError> {
let point = match endpoint_type {
EndpointType::Community => "c",
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EndpointType::Person => "u",
EndpointType::Post => "post",
EndpointType::Comment => "comment",
EndpointType::PrivateMessage => "private_message",
};
Ok(Url::parse(&format!("{}/{}/{}", domain, point, name))?.into())
}
pub fn generate_followers_url(actor_id: &DbUrl) -> Result<DbUrl, ParseError> {
Ok(Url::parse(&format!("{}/followers", actor_id))?.into())
}
pub fn generate_inbox_url(actor_id: &DbUrl) -> Result<DbUrl, ParseError> {
Ok(Url::parse(&format!("{}/inbox", actor_id))?.into())
}
pub fn generate_shared_inbox_url(actor_id: &DbUrl) -> Result<DbUrl, LemmyError> {
let actor_id: Url = actor_id.clone().into();
let url = format!(
"{}://{}{}/inbox",
&actor_id.scheme(),
&actor_id.host_str().context(location_info!())?,
if let Some(port) = actor_id.port() {
format!(":{}", port)
} else {
"".to_string()
},
);
Ok(Url::parse(&url)?.into())
}
pub fn generate_outbox_url(actor_id: &DbUrl) -> Result<DbUrl, ParseError> {
Ok(Url::parse(&format!("{}/outbox", actor_id))?.into())
}
fn generate_moderators_url(community_id: &DbUrl) -> Result<DbUrl, LemmyError> {
Ok(Url::parse(&format!("{}/moderators", community_id))?.into())
}
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/// Store a sent or received activity in the database, for logging purposes. These records are not
/// persistent.
#[tracing::instrument(skip(pool))]
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async fn insert_activity(
ap_id: &Url,
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activity: serde_json::Value,
local: bool,
sensitive: bool,
pool: &DbPool,
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) -> Result<(), LemmyError> {
let ap_id = ap_id.to_owned().into();
blocking(pool, move |conn| {
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Activity::insert(conn, ap_id, activity, local, sensitive)
})
.await??;
Ok(())
}