merge upstream

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "activitypub_federation"
-version = "0.5.0-beta.5"
+version = "0.5.0-beta.6"
 edition = "2021"
 description = "High-level Activitypub framework"
 keywords = ["activitypub", "activitystreams", "federation", "fediverse"]
@@ -8,18 +8,27 @@ license = "AGPL-3.0"
 repository = "https://github.com/LemmyNet/activitypub-federation-rust"
 documentation = "https://docs.rs/activitypub_federation/"
 
+[features]
+default = ["actix-web", "axum"]
+actix-web = ["dep:actix-web"]
+axum = ["dep:axum", "dep:tower", "dep:hyper", "dep:http-body-util"]
+diesel = ["dep:diesel"]
+
 [dependencies]
 chrono = { version = "0.4.31", features = ["clock"], default-features = false }
 serde = { version = "1.0.193", features = ["derive"] }
+serde = { version = "1.0.193", features = ["derive"] }
 async-trait = "0.1.74"
 url = { version = "2.5.0", features = ["serde"] }
 serde_json = { version = "1.0.108", features = ["preserve_order"] }
+url = { version = "2.5.0", features = ["serde"] }
+serde_json = { version = "1.0.108", features = ["preserve_order"] }
 reqwest = { version = "0.11.22", features = ["json", "stream"] }
 reqwest-middleware = "0.2.4"
 tracing = "0.1.40"
 base64 = "0.21.5"
-openssl = "0.10.60"
+openssl = "0.10.61"
-once_cell = "1.18.0"
+once_cell = "1.19.0"
 http = "0.2.11"
 sha2 = "0.10.8"
 thiserror = "1.0.50"
@@ -32,6 +41,7 @@ http-signature-normalization-reqwest = { version = "0.10.0", default-features =
   "default-spawner",
   "sha-2",
   "middleware",
+  "default-spawner",
 ] }
 http-signature-normalization = "0.7.0"
 bytes = "1.5.0"
@@ -48,6 +58,9 @@ tokio = { version = "1.34.0", features = [
   "rt-multi-thread",
   "time",
 ] }
+diesel = { version = "2.1.4", features = ["postgres"], default-features = false, optional = true }
+futures = "0.3.29"
+moka = { version = "0.12.1", features = ["future"] }
 
 # Actix-web
 actix-web = { version = "4.4.0", default-features = false, optional = true }
@@ -58,8 +71,7 @@ axum = { git = "https://github.com/tokio-rs/axum.git", rev = "30afe97e99303fffc4
 ], default-features = false, optional = true }
 tower = { version = "*", optional = true }
 hyper = { version = "*", optional = true }
-futures = "*"
+http-body-util = {version = "0.1.0", optional = true }
-moka = { version = "0.12.1", features = ["future"] }
 
 [features]
 default = ["actix-web", "axum"]

docs/06_http_endpoints_axum.md

@@ -48,7 +48,7 @@ async fn http_get_user(
 ) -> impl IntoResponse {
     let accept = header_map.get("accept").map(|v| v.to_str().unwrap());
     if accept == Some(FEDERATION_CONTENT_TYPE) {
-        let db_user = data.read_local_user(name).await.unwrap();
+        let db_user = data.read_local_user(&name).await.unwrap();
         let json_user = db_user.into_json(&data).await.unwrap();
         FederationJson(WithContext::new_default(json_user)).into_response()
     }

examples/live_federation/http.rs

@@ -61,7 +61,7 @@ pub async fn webfinger(
     data: Data<DatabaseHandle>,
 ) -> Result<Json<Webfinger>, Error> {
     let name = extract_webfinger_name(&query.resource, &data)?;
-    let db_user = data.read_user(&name)?;
+    let db_user = data.read_user(name)?;
     Ok(Json(build_webfinger_response(
         query.resource,
         db_user.ap_id.into_inner(),

examples/local_federation/actix_web/http.rs

@@ -89,7 +89,7 @@ pub async fn webfinger(
     data: Data<DatabaseHandle>,
 ) -> Result<HttpResponse, Error> {
     let name = extract_webfinger_name(&query.resource, &data)?;
-    let db_user = data.read_user(&name)?;
+    let db_user = data.read_user(name)?;
     Ok(HttpResponse::Ok().json(build_webfinger_response(
         query.resource.clone(),
         db_user.ap_id.into_inner(),

examples/local_federation/axum/http.rs

@@ -75,7 +75,7 @@ async fn webfinger(
     data: Data<DatabaseHandle>,
 ) -> Result<Json<Webfinger>, Error> {
     let name = extract_webfinger_name(&query.resource, &data)?;
-    let db_user = data.read_user(&name)?;
+    let db_user = data.read_user(name)?;
     Ok(Json(build_webfinger_response(
         query.resource,
         db_user.ap_id.into_inner(),

src/activity_sending.rs

@@ -13,17 +13,15 @@ use crate::{
 
 use bytes::Bytes;
 use futures::StreamExt;
-use http::{header::HeaderName, HeaderMap, HeaderValue};
 use httpdate::fmt_http_date;
 use itertools::Itertools;
 use openssl::pkey::{PKey, Private};
-use reqwest::Request;
+use reqwest::header::{HeaderMap, HeaderName, HeaderValue};
-use reqwest_middleware::ClientWithMiddleware;
 use serde::Serialize;
 use std::{
     self,
     fmt::{Debug, Display},
-    time::{Duration, SystemTime},
+    time::SystemTime,
 };
 use tracing::debug;
 use url::Url;
@@ -94,33 +92,19 @@ impl SendActivityTask<'_> {
 
     /// convert a sendactivitydata to a request, signing and sending it
     pub async fn sign_and_send<Datatype: Clone>(&self, data: &Data<Datatype>) -> Result<(), Error> {
-        let req = self
+        let client = &data.config.client;
-            .sign(&data.config.client, data.config.request_timeout)
-            .await?;
-        self.send(&data.config.client, req).await
-    }
-    async fn sign(
-        &self,
-        client: &ClientWithMiddleware,
-        timeout: Duration,
-    ) -> Result<Request, Error> {
-        let task = self;
         let request_builder = client
-            .post(task.inbox.to_string())
+            .post(self.inbox.to_string())
-            .timeout(timeout)
+            .timeout(data.config.request_timeout)
-            .headers(generate_request_headers(&task.inbox));
+            .headers(generate_request_headers(&self.inbox));
         let request = sign_request(
             request_builder,
-            task.actor_id,
+            self.actor_id,
-            task.activity.clone(),
+            self.activity.clone(),
-            task.private_key.clone(),
+            self.private_key.clone(),
-            task.http_signature_compat,
+            self.http_signature_compat,
         )
         .await?;
-        Ok(request)
-    }
-
-    async fn send(&self, client: &ClientWithMiddleware, request: Request) -> Result<(), Error> {
         let response = client.execute(request).await?;
 
         match response {
@@ -287,7 +271,7 @@ mod tests {
         let start = Instant::now();
 
         for _ in 0..num_messages {
-            message.sign_and_send(&data).await?;
+            message.clone().sign_and_send(&data).await?;
         }
 
         info!("Queue Sent: {:?}", start.elapsed());

src/actix_web/inbox.rs

@@ -3,8 +3,8 @@
 use crate::{
     config::Data,
     error::Error,
-    fetch::object_id::ObjectId,
     http_signatures::{verify_body_hash, verify_signature},
+    parse_received_activity,
     traits::{ActivityHandler, Actor, Object},
 };
 use actix_web::{web::Bytes, HttpRequest, HttpResponse};
@@ -29,11 +29,7 @@ where
 {
     verify_body_hash(request.headers().get("Digest"), &body)?;
 
-    let activity: Activity = serde_json::from_slice(&body).map_err(Error::Json)?;
+    let (activity, actor) = parse_received_activity::<Activity, ActorT, _>(&body, data).await?;
-    data.config.verify_url_and_domain(&activity).await?;
-    let actor = ObjectId::<ActorT>::from(activity.actor().clone())
-        .dereference(data)
-        .await?;
 
     verify_signature(
         request.headers(),
@@ -54,12 +50,14 @@ mod test {
     use crate::{
         activity_sending::generate_request_headers,
         config::FederationConfig,
+        fetch::object_id::ObjectId,
         http_signatures::sign_request,
         traits::tests::{DbConnection, DbUser, Follow, DB_USER_KEYPAIR},
     };
     use actix_web::test::TestRequest;
     use reqwest::Client;
     use reqwest_middleware::ClientWithMiddleware;
+    use serde_json::json;
     use url::Url;
 
     #[tokio::test]
@@ -105,22 +103,49 @@ mod test {
         assert_eq!(&err, &Error::ActivitySignatureInvalid)
     }
 
-    async fn setup_receive_test() -> (Bytes, TestRequest, FederationConfig<DbConnection>) {
+    #[tokio::test]
+    async fn test_receive_unparseable_activity() {
+        let (_, _, config) = setup_receive_test().await;
+
+        let actor = Url::parse("http://ds9.lemmy.ml/u/lemmy_alpha").unwrap();
+        let id = "http://localhost:123/1";
+        let activity = json!({
+          "actor": actor.as_str(),
+          "to": ["https://www.w3.org/ns/activitystreams#Public"],
+          "object": "http://ds9.lemmy.ml/post/1",
+          "cc": ["http://enterprise.lemmy.ml/c/main"],
+          "type": "Delete",
+          "id": id
+        }
+        );
+        let body: Bytes = serde_json::to_vec(&activity).unwrap().into();
+        let incoming_request = construct_request(&body, &actor).await;
+
+        // intentionally cause a parse error by using wrong type for deser
+        let res = receive_activity::<Follow, DbUser, DbConnection>(
+            incoming_request.to_http_request(),
+            body,
+            &config.to_request_data(),
+        )
+        .await;
+
+        match res {
+            Err(Error::ParseReceivedActivity(url, _)) => {
+                assert_eq!(id, url.as_str());
+            }
+            _ => unreachable!(),
+        }
+    }
+
+    async fn construct_request(body: &Bytes, actor: &Url) -> TestRequest {
         let inbox = "https://example.com/inbox";
         let headers = generate_request_headers(&Url::parse(inbox).unwrap());
         let request_builder = ClientWithMiddleware::from(Client::default())
             .post(inbox)
             .headers(headers);
-        let activity = Follow {
-            actor: ObjectId::parse("http://localhost:123").unwrap(),
-            object: ObjectId::parse("http://localhost:124").unwrap(),
-            kind: Default::default(),
-            id: "http://localhost:123/1".try_into().unwrap(),
-        };
-        let body: Bytes = serde_json::to_vec(&activity).unwrap().into();
         let outgoing_request = sign_request(
             request_builder,
-            &activity.actor.into_inner(),
+            actor,
             body.clone(),
             DB_USER_KEYPAIR.private_key().unwrap(),
             false,
@@ -131,6 +156,18 @@ mod test {
         for h in outgoing_request.headers() {
             incoming_request = incoming_request.append_header(h);
         }
+        incoming_request
+    }
+
+    async fn setup_receive_test() -> (Bytes, TestRequest, FederationConfig<DbConnection>) {
+        let activity = Follow {
+            actor: ObjectId::parse("http://localhost:123").unwrap(),
+            object: ObjectId::parse("http://localhost:124").unwrap(),
+            kind: Default::default(),
+            id: "http://localhost:123/1".try_into().unwrap(),
+        };
+        let body: Bytes = serde_json::to_vec(&activity).unwrap().into();
+        let incoming_request = construct_request(&body, activity.actor.inner()).await;
 
         let config = FederationConfig::builder()
             .domain("localhost:8002")

src/axum/inbox.rs

@@ -5,8 +5,8 @@
 use crate::{
     config::Data,
     error::Error,
-    fetch::object_id::ObjectId,
+    http_signatures::verify_signature,
-    http_signatures::{verify_body_hash, verify_signature},
+    parse_received_activity,
     traits::{ActivityHandler, Actor, Object},
 };
 use axum::{
@@ -33,13 +33,8 @@ where
     <ActorT as Object>::Error: From<Error>,
     Datatype: Clone,
 {
-    verify_body_hash(activity_data.headers.get("Digest"), &activity_data.body)?;
+    let (activity, actor) =
-
+        parse_received_activity::<Activity, ActorT, _>(&activity_data.body, data).await?;
-    let activity: Activity = serde_json::from_slice(&activity_data.body).map_err(Error::Json)?;
-    data.config.verify_url_and_domain(&activity).await?;
-    let actor = ObjectId::<ActorT>::from(activity.actor().clone())
-        .dereference(data)
-        .await?;
 
     // verify_signature(
     //     &activity_data.headers,

src/axum/json.rs

@@ -9,7 +9,7 @@
 //! # use activitypub_federation::traits::Object;
 //! # use activitypub_federation::traits::tests::{DbConnection, DbUser, Person};
 //! async fn http_get_user(Path(name): Path<String>, data: Data<DbConnection>) -> Result<FederationJson<WithContext<Person>>, Error> {
-//!     let user: DbUser = data.read_local_user(name).await?;
+//!     let user: DbUser = data.read_local_user(&name).await?;
 //!     let person = user.into_json(&data).await?;
 //!
 //!     Ok(FederationJson(WithContext::new_default(person)))

src/error.rs

@@ -6,6 +6,8 @@ use http_signature_normalization_reqwest::SignError;
 use openssl::error::ErrorStack;
 use url::Url;
 
+use crate::fetch::webfinger::WebFingerError;
+
 /// Error messages returned by this library
 #[derive(thiserror::Error, Debug)]
 pub enum Error {
@@ -32,13 +34,13 @@ pub enum Error {
     ActivitySignatureInvalid,
     /// Failed to resolve actor via webfinger
     #[error("Failed to resolve actor via webfinger")]
-    WebfingerResolveFailed,
+    WebfingerResolveFailed(#[from] WebFingerError),
-    /// Failed to resolve actor via webfinger
-    #[error("Webfinger regex failed to match")]
-    WebfingerRegexFailed,
     /// JSON Error
     #[error(transparent)]
     Json(#[from] serde_json::Error),
+    /// Failed to parse an activity received from another instance
+    #[error("Failed to parse incoming activity with id {0}: {1}")]
+    ParseReceivedActivity(Url, serde_json::Error),
     /// Reqwest Middleware Error
     #[error(transparent)]
     ReqwestMiddleware(#[from] reqwest_middleware::Error),

src/fetch/collection_id.rs

@@ -102,3 +102,92 @@ where
         self.0.eq(&other.0) && self.1 == other.1
     }
 }
+
+#[cfg(feature = "diesel")]
+const _IMPL_DIESEL_NEW_TYPE_FOR_COLLECTION_ID: () = {
+    use diesel::{
+        backend::Backend,
+        deserialize::{FromSql, FromStaticSqlRow},
+        expression::AsExpression,
+        internal::derives::as_expression::Bound,
+        pg::Pg,
+        query_builder::QueryId,
+        serialize,
+        serialize::{Output, ToSql},
+        sql_types::{HasSqlType, SingleValue, Text},
+        Expression,
+        Queryable,
+    };
+
+    // TODO: this impl only works for Postgres db because of to_string() call which requires reborrow
+    impl<Kind, ST> ToSql<ST, Pg> for CollectionId<Kind>
+    where
+        Kind: Collection,
+        for<'de2> <Kind as Collection>::Kind: Deserialize<'de2>,
+        String: ToSql<ST, Pg>,
+    {
+        fn to_sql<'b>(&'b self, out: &mut Output<'b, '_, Pg>) -> serialize::Result {
+            let v = self.0.to_string();
+            <String as ToSql<Text, Pg>>::to_sql(&v, &mut out.reborrow())
+        }
+    }
+    impl<'expr, Kind, ST> AsExpression<ST> for &'expr CollectionId<Kind>
+    where
+        Kind: Collection,
+        for<'de2> <Kind as Collection>::Kind: Deserialize<'de2>,
+        Bound<ST, String>: Expression<SqlType = ST>,
+        ST: SingleValue,
+    {
+        type Expression = Bound<ST, &'expr str>;
+        fn as_expression(self) -> Self::Expression {
+            Bound::new(self.0.as_str())
+        }
+    }
+    impl<Kind, ST> AsExpression<ST> for CollectionId<Kind>
+    where
+        Kind: Collection,
+        for<'de2> <Kind as Collection>::Kind: Deserialize<'de2>,
+        Bound<ST, String>: Expression<SqlType = ST>,
+        ST: SingleValue,
+    {
+        type Expression = Bound<ST, String>;
+        fn as_expression(self) -> Self::Expression {
+            Bound::new(self.0.to_string())
+        }
+    }
+    impl<Kind, ST, DB> FromSql<ST, DB> for CollectionId<Kind>
+    where
+        Kind: Collection + Send + 'static,
+        for<'de2> <Kind as Collection>::Kind: Deserialize<'de2>,
+        String: FromSql<ST, DB>,
+        DB: Backend,
+        DB: HasSqlType<ST>,
+    {
+        fn from_sql(
+            raw: DB::RawValue<'_>,
+        ) -> Result<Self, Box<dyn ::std::error::Error + Send + Sync>> {
+            let string: String = FromSql::<ST, DB>::from_sql(raw)?;
+            Ok(CollectionId::parse(&string)?)
+        }
+    }
+    impl<Kind, ST, DB> Queryable<ST, DB> for CollectionId<Kind>
+    where
+        Kind: Collection + Send + 'static,
+        for<'de2> <Kind as Collection>::Kind: Deserialize<'de2>,
+        String: FromStaticSqlRow<ST, DB>,
+        DB: Backend,
+        DB: HasSqlType<ST>,
+    {
+        type Row = String;
+        fn build(row: Self::Row) -> diesel::deserialize::Result<Self> {
+            Ok(CollectionId::parse(&row)?)
+        }
+    }
+    impl<Kind> QueryId for CollectionId<Kind>
+    where
+        Kind: Collection + 'static,
+        for<'de2> <Kind as Collection>::Kind: Deserialize<'de2>,
+    {
+        type QueryId = Self;
+    }
+};

src/fetch/object_id.rs

@@ -57,12 +57,12 @@ where
 pub struct ObjectId<Kind>(Box<Url>, PhantomData<Kind>)
 where
     Kind: Object,
-    for<'de2> <Kind as Object>::Kind: serde::Deserialize<'de2>;
+    for<'de2> <Kind as Object>::Kind: Deserialize<'de2>;
 
 impl<Kind> ObjectId<Kind>
 where
     Kind: Object + Send + Debug + 'static,
-    for<'de2> <Kind as Object>::Kind: serde::Deserialize<'de2>,
+    for<'de2> <Kind as Object>::Kind: Deserialize<'de2>,
 {
     /// Construct a new objectid instance
     pub fn parse(url: &str) -> Result<Self, url::ParseError> {
@@ -112,6 +112,24 @@ where
         }
     }
 
+    /// If this is a remote object, fetch it from origin instance unconditionally to get the
+    /// latest version, regardless of refresh interval.
+    pub async fn dereference_forced(
+        &self,
+        data: &Data<<Kind as Object>::DataType>,
+    ) -> Result<Kind, <Kind as Object>::Error>
+    where
+        <Kind as Object>::Error: From<Error>,
+    {
+        if data.config.is_local_url(&self.0) {
+            self.dereference_from_db(data)
+                .await
+                .map(|o| o.ok_or(Error::NotFound.into()))?
+        } else {
+            self.dereference_from_http(data, None).await
+        }
+    }
+
     /// Fetch an object from the local db. Instead of falling back to http, this throws an error if
     /// the object is not found in the database.
     pub async fn dereference_local(
@@ -163,7 +181,7 @@ where
 impl<Kind> Clone for ObjectId<Kind>
 where
     Kind: Object,
-    for<'de2> <Kind as Object>::Kind: serde::Deserialize<'de2>,
+    for<'de2> <Kind as Object>::Kind: Deserialize<'de2>,
 {
     fn clone(&self) -> Self {
         ObjectId(self.0.clone(), self.1)
@@ -190,7 +208,7 @@ fn should_refetch_object(last_refreshed: DateTime<Utc>) -> bool {
 impl<Kind> Display for ObjectId<Kind>
 where
     Kind: Object,
-    for<'de2> <Kind as Object>::Kind: serde::Deserialize<'de2>,
+    for<'de2> <Kind as Object>::Kind: Deserialize<'de2>,
 {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         write!(f, "{}", self.0.as_str())
@@ -200,7 +218,7 @@ where
 impl<Kind> Debug for ObjectId<Kind>
 where
     Kind: Object,
-    for<'de2> <Kind as Object>::Kind: serde::Deserialize<'de2>,
+    for<'de2> <Kind as Object>::Kind: Deserialize<'de2>,
 {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         write!(f, "{}", self.0.as_str())
@@ -210,7 +228,7 @@ where
 impl<Kind> From<ObjectId<Kind>> for Url
 where
     Kind: Object,
-    for<'de2> <Kind as Object>::Kind: serde::Deserialize<'de2>,
+    for<'de2> <Kind as Object>::Kind: Deserialize<'de2>,
 {
     fn from(id: ObjectId<Kind>) -> Self {
         *id.0
@@ -220,7 +238,7 @@ where
 impl<Kind> From<Url> for ObjectId<Kind>
 where
     Kind: Object + Send + 'static,
-    for<'de2> <Kind as Object>::Kind: serde::Deserialize<'de2>,
+    for<'de2> <Kind as Object>::Kind: Deserialize<'de2>,
 {
     fn from(url: Url) -> Self {
         ObjectId(Box::new(url), PhantomData::<Kind>)
@@ -230,13 +248,102 @@ where
 impl<Kind> PartialEq for ObjectId<Kind>
 where
     Kind: Object,
-    for<'de2> <Kind as Object>::Kind: serde::Deserialize<'de2>,
+    for<'de2> <Kind as Object>::Kind: Deserialize<'de2>,
 {
     fn eq(&self, other: &Self) -> bool {
         self.0.eq(&other.0) && self.1 == other.1
     }
 }
 
+#[cfg(feature = "diesel")]
+const _IMPL_DIESEL_NEW_TYPE_FOR_OBJECT_ID: () = {
+    use diesel::{
+        backend::Backend,
+        deserialize::{FromSql, FromStaticSqlRow},
+        expression::AsExpression,
+        internal::derives::as_expression::Bound,
+        pg::Pg,
+        query_builder::QueryId,
+        serialize,
+        serialize::{Output, ToSql},
+        sql_types::{HasSqlType, SingleValue, Text},
+        Expression,
+        Queryable,
+    };
+
+    // TODO: this impl only works for Postgres db because of to_string() call which requires reborrow
+    impl<Kind, ST> ToSql<ST, Pg> for ObjectId<Kind>
+    where
+        Kind: Object,
+        for<'de2> <Kind as Object>::Kind: Deserialize<'de2>,
+        String: ToSql<ST, Pg>,
+    {
+        fn to_sql<'b>(&'b self, out: &mut Output<'b, '_, Pg>) -> serialize::Result {
+            let v = self.0.to_string();
+            <String as ToSql<Text, Pg>>::to_sql(&v, &mut out.reborrow())
+        }
+    }
+    impl<'expr, Kind, ST> AsExpression<ST> for &'expr ObjectId<Kind>
+    where
+        Kind: Object,
+        for<'de2> <Kind as Object>::Kind: Deserialize<'de2>,
+        Bound<ST, String>: Expression<SqlType = ST>,
+        ST: SingleValue,
+    {
+        type Expression = Bound<ST, &'expr str>;
+        fn as_expression(self) -> Self::Expression {
+            Bound::new(self.0.as_str())
+        }
+    }
+    impl<Kind, ST> AsExpression<ST> for ObjectId<Kind>
+    where
+        Kind: Object,
+        for<'de2> <Kind as Object>::Kind: Deserialize<'de2>,
+        Bound<ST, String>: Expression<SqlType = ST>,
+        ST: SingleValue,
+    {
+        type Expression = Bound<ST, String>;
+        fn as_expression(self) -> Self::Expression {
+            Bound::new(self.0.to_string())
+        }
+    }
+    impl<Kind, ST, DB> FromSql<ST, DB> for ObjectId<Kind>
+    where
+        Kind: Object + Send + 'static,
+        for<'de2> <Kind as Object>::Kind: Deserialize<'de2>,
+        String: FromSql<ST, DB>,
+        DB: Backend,
+        DB: HasSqlType<ST>,
+    {
+        fn from_sql(
+            raw: DB::RawValue<'_>,
+        ) -> Result<Self, Box<dyn ::std::error::Error + Send + Sync>> {
+            let string: String = FromSql::<ST, DB>::from_sql(raw)?;
+            Ok(ObjectId::parse(&string)?)
+        }
+    }
+    impl<Kind, ST, DB> Queryable<ST, DB> for ObjectId<Kind>
+    where
+        Kind: Object + Send + 'static,
+        for<'de2> <Kind as Object>::Kind: Deserialize<'de2>,
+        String: FromStaticSqlRow<ST, DB>,
+        DB: Backend,
+        DB: HasSqlType<ST>,
+    {
+        type Row = String;
+        fn build(row: Self::Row) -> diesel::deserialize::Result<Self> {
+            Ok(ObjectId::parse(&row)?)
+        }
+    }
+    impl<Kind> QueryId for ObjectId<Kind>
+    where
+        Kind: Object + 'static,
+        for<'de2> <Kind as Object>::Kind: Deserialize<'de2>,
+    {
+        type QueryId = Self;
+    }
+};
+
 #[cfg(test)]
 pub mod tests {
     use super::*;

src/fetch/webfinger.rs

@@ -1,17 +1,38 @@
 use crate::{
     config::Data,
-    error::{Error, Error::WebfingerResolveFailed},
+    error::Error,
     fetch::{fetch_object_http_with_accept, object_id::ObjectId},
     traits::{Actor, Object},
     FEDERATION_CONTENT_TYPE,
 };
 use itertools::Itertools;
+use once_cell::sync::Lazy;
 use regex::Regex;
 use serde::{Deserialize, Serialize};
-use std::collections::HashMap;
+use std::{collections::HashMap, fmt::Display};
 use tracing::debug;
 use url::Url;
 
+/// Errors relative to webfinger handling
+#[derive(thiserror::Error, Debug)]
+pub enum WebFingerError {
+    /// The webfinger identifier is invalid
+    #[error("The webfinger identifier is invalid")]
+    WrongFormat,
+    /// The webfinger identifier doesn't match the expected instance domain name
+    #[error("The webfinger identifier doesn't match the expected instance domain name")]
+    WrongDomain,
+    /// The wefinger object did not contain any link to an activitypub item
+    #[error("The webfinger object did not contain any link to an activitypub item")]
+    NoValidLink,
+}
+
+impl WebFingerError {
+    fn into_crate_error(self) -> Error {
+        self.into()
+    }
+}
+
 /// Takes an identifier of the form `name@example.com`, and returns an object of `Kind`.
 ///
 /// For this the identifier is first resolved via webfinger protocol to an Activitypub ID. This ID
@@ -23,12 +44,12 @@ pub async fn webfinger_resolve_actor<T: Clone, Kind>(
 where
     Kind: Object + Actor + Send + 'static + Object<DataType = T>,
     for<'de2> <Kind as Object>::Kind: serde::Deserialize<'de2>,
-    <Kind as Object>::Error: From<crate::error::Error> + Send + Sync,
+    <Kind as Object>::Error: From<crate::error::Error> + Send + Sync + Display,
 {
     let (_, domain) = identifier
         .splitn(2, '@')
         .collect_tuple()
-        .ok_or(WebfingerResolveFailed)?;
+        .ok_or(WebFingerError::WrongFormat.into_crate_error())?;
     let protocol = if data.config.debug { "http" } else { "https" };
     let fetch_url =
         format!("{protocol}://{domain}/.well-known/webfinger?resource=acct:{identifier}");
@@ -55,13 +76,15 @@ where
         })
         .filter_map(|l| l.href.clone())
         .collect();
+
     for l in links {
         let object = ObjectId::<Kind>::from(l).dereference(data).await;
-        if object.is_ok() {
+        match object {
-            return object;
+            Ok(obj) => return Ok(obj),
+            Err(error) => debug!(%error, "Failed to dereference link"),
         }
     }
-    Err(WebfingerResolveFailed.into())
+    Err(WebFingerError::NoValidLink.into_crate_error().into())
 }
 
 /// Extracts username from a webfinger resource parameter.
@@ -89,22 +112,24 @@ where
 /// # Ok::<(), anyhow::Error>(())
 /// }).unwrap();
 ///```
-pub fn extract_webfinger_name<T>(query: &str, data: &Data<T>) -> Result<String, Error>
+pub fn extract_webfinger_name<'i, T>(query: &'i str, data: &Data<T>) -> Result<&'i str, Error>
 where
     T: Clone,
 {
+    static WEBFINGER_REGEX: Lazy<Regex> =
+        Lazy::new(|| Regex::new(r"^acct:([\p{L}0-9_]+)@(.*)$").expect("compile regex"));
     // Regex to extract usernames from webfinger query. Supports different alphabets using `\p{L}`.
-    // TODO: would be nice if we could implement this without regex and remove the dependency
+    // TODO: This should use a URL parser
-    let result = Regex::new(&format!(r"^acct:([\p{{L}}0-9_]+)@{}$", data.domain()))
+    let captures = WEBFINGER_REGEX
-        .map_err(|_| Error::WebfingerRegexFailed)
-        .and_then(|regex| {
-            regex
         .captures(query)
-                .and_then(|c| c.get(1))
+        .ok_or(WebFingerError::WrongFormat)?;
-                .ok_or_else(|| Error::WebfingerRegexFailed)
-        })?;
 
-    return Ok(result.as_str().to_string());
+    let account_name = captures.get(1).ok_or(WebFingerError::WrongFormat)?;
+
+    if captures.get(2).map(|m| m.as_str()) != Some(data.domain()) {
+        return Err(WebFingerError::WrongDomain.into());
+    }
+    Ok(account_name.as_str())
 }
 
 /// Builds a basic webfinger response for the actor.
@@ -252,15 +277,15 @@ mod tests {
             request_counter: Default::default(),
         };
         assert_eq!(
-            Ok("test123".to_string()),
+            Ok("test123"),
             extract_webfinger_name("acct:test123@example.com", &data)
         );
         assert_eq!(
-            Ok("Владимир".to_string()),
+            Ok("Владимир"),
             extract_webfinger_name("acct:Владимир@example.com", &data)
         );
         assert_eq!(
-            Ok("تجريب".to_string()),
+            Ok("تجريب"),
             extract_webfinger_name("acct:تجريب@example.com", &data)
         );
         Ok(())

src/lib.rs

@@ -23,7 +23,48 @@ pub mod protocol;
 pub(crate) mod reqwest_shim;
 pub mod traits;
 
+use crate::{
+    config::Data,
+    error::Error,
+    fetch::object_id::ObjectId,
+    traits::{ActivityHandler, Actor, Object},
+};
 pub use activitystreams_kinds as kinds;
 
+use serde::{de::DeserializeOwned, Deserialize};
+use url::Url;
+
 /// Mime type for Activitypub data, used for `Accept` and `Content-Type` HTTP headers
 pub static FEDERATION_CONTENT_TYPE: &str = "application/activity+json";
+
+/// Deserialize incoming inbox activity to the given type, perform basic
+/// validation and extract the actor.
+async fn parse_received_activity<Activity, ActorT, Datatype>(
+    body: &[u8],
+    data: &Data<Datatype>,
+) -> Result<(Activity, ActorT), <Activity as ActivityHandler>::Error>
+where
+    Activity: ActivityHandler<DataType = Datatype> + DeserializeOwned + Send + 'static,
+    ActorT: Object<DataType = Datatype> + Actor + Send + 'static,
+    for<'de2> <ActorT as Object>::Kind: serde::Deserialize<'de2>,
+    <Activity as ActivityHandler>::Error: From<Error> + From<<ActorT as Object>::Error>,
+    <ActorT as Object>::Error: From<Error>,
+    Datatype: Clone,
+{
+    let activity: Activity = serde_json::from_slice(body).map_err(|e| {
+        // Attempt to include activity id in error message
+        #[derive(Deserialize)]
+        struct Id {
+            id: Url,
+        }
+        match serde_json::from_slice::<Id>(body) {
+            Ok(id) => Error::ParseReceivedActivity(id.id, e),
+            Err(e) => Error::Json(e),
+        }
+    })?;
+    data.config.verify_url_and_domain(&activity).await?;
+    let actor = ObjectId::<ActorT>::from(activity.actor().clone())
+        .dereference(data)
+        .await?;
+    Ok((activity, actor))
+}

src/traits.rs

@@ -356,7 +356,7 @@ pub mod tests {
         pub async fn read_post_from_json_id<T>(&self, _: Url) -> Result<Option<T>, Error> {
             Ok(None)
         }
-        pub async fn read_local_user(&self, _: String) -> Result<DbUser, Error> {
+        pub async fn read_local_user(&self, _: &str) -> Result<DbUser, Error> {
             todo!()
         }
         pub async fn upsert<T>(&self, _: &T) -> Result<(), Error> {