Support signed fetch for federation (fixes #868) (#4125)

* Support signed fetch for federation (fixes #868)

* taplo

crates/api_crud/src/site/create.rs

@@ -492,29 +492,13 @@ mod tests {
     site_registration_mode: RegistrationMode,
   ) -> LocalSite {
     LocalSite {
-      id: Default::default(),
-      site_id: Default::default(),
       site_setup,
-      enable_downvotes: false,
-      enable_nsfw: false,
-      community_creation_admin_only: false,
-      require_email_verification: false,
       application_question: site_application_question,
       private_instance: site_is_private,
-      default_theme: String::new(),
-      default_post_listing_type: ListingType::All,
-      legal_information: None,
-      hide_modlog_mod_names: false,
-      application_email_admins: false,
       slur_filter_regex: site_slur_filter_regex,
-      actor_name_max_length: 0,
       federation_enabled: site_is_federated,
-      captcha_enabled: false,
-      captcha_difficulty: String::new(),
-      published: Default::default(),
-      updated: None,
       registration_mode: site_registration_mode,
-      reports_email_admins: false,
+      ..Default::default()
     }
   }
 

crates/api_crud/src/site/update.rs

@@ -491,29 +491,12 @@ mod tests {
     site_registration_mode: RegistrationMode,
   ) -> LocalSite {
     LocalSite {
-      id: Default::default(),
-      site_id: Default::default(),
-      site_setup: true,
-      enable_downvotes: false,
-      enable_nsfw: false,
-      community_creation_admin_only: false,
-      require_email_verification: false,
       application_question: site_application_question,
       private_instance: site_is_private,
-      default_theme: String::new(),
-      default_post_listing_type: ListingType::All,
-      legal_information: None,
-      hide_modlog_mod_names: false,
-      application_email_admins: false,
       slur_filter_regex: site_slur_filter_regex,
-      actor_name_max_length: 0,
       federation_enabled: site_is_federated,
-      captcha_enabled: false,
-      captcha_difficulty: String::new(),
-      published: Default::default(),
-      updated: None,
       registration_mode: site_registration_mode,
-      reports_email_admins: false,
+      ..Default::default()
     }
   }
 

crates/db_schema/src/lib.rs

@@ -114,7 +114,9 @@ pub enum ListingType {
   ModeratorView,
 }
 
-#[derive(EnumString, Display, Debug, Serialize, Deserialize, Clone, Copy, PartialEq, Eq)]
+#[derive(
+  EnumString, Display, Debug, Serialize, Deserialize, Clone, Copy, PartialEq, Eq, Default,
+)]
 #[cfg_attr(feature = "full", derive(DbEnum, TS))]
 #[cfg_attr(
   feature = "full",
@@ -129,6 +131,7 @@ pub enum RegistrationMode {
   /// Open, but pending approval of a registration application.
   RequireApplication,
   /// Open to all.
+  #[default]
   Open,
 }
 

crates/db_schema/src/schema.rs

@@ -385,6 +385,7 @@ diesel::table! {
         updated -> Nullable<Timestamptz>,
         registration_mode -> RegistrationModeEnum,
         reports_email_admins -> Bool,
+        federation_signed_fetch -> Bool,
     }
 }
 

crates/db_schema/src/source/local_site.rs

@@ -13,7 +13,7 @@ use ts_rs::TS;
 use typed_builder::TypedBuilder;
 
 #[skip_serializing_none]
-#[derive(PartialEq, Eq, Debug, Clone, Serialize, Deserialize)]
+#[derive(PartialEq, Eq, Debug, Clone, Serialize, Deserialize, Default)]
 #[cfg_attr(feature = "full", derive(Queryable, Identifiable, TS))]
 #[cfg_attr(feature = "full", diesel(table_name = local_site))]
 #[cfg_attr(feature = "full", diesel(belongs_to(crate::source::site::Site)))]
@@ -60,6 +60,9 @@ pub struct LocalSite {
   pub registration_mode: RegistrationMode,
   /// Whether to email admins on new reports.
   pub reports_email_admins: bool,
+  /// Whether to sign outgoing Activitypub fetches with private key of local instance. Some
+  /// Fediverse instances and platforms require this.
+  pub federation_signed_fetch: bool,
 }
 
 #[derive(Clone, TypedBuilder)]
@@ -88,6 +91,7 @@ pub struct LocalSiteInsertForm {
   pub captcha_difficulty: Option<String>,
   pub registration_mode: Option<RegistrationMode>,
   pub reports_email_admins: Option<bool>,
+  pub federation_signed_fetch: Option<bool>,
 }
 
 #[derive(Clone, Default)]
@@ -114,4 +118,5 @@ pub struct LocalSiteUpdateForm {
   pub registration_mode: Option<RegistrationMode>,
   pub reports_email_admins: Option<bool>,
   pub updated: Option<Option<DateTime<Utc>>>,
+  pub federation_signed_fetch: Option<bool>,
 }

migrations/2023-11-02-120140_apub-signed-fetch/down.sql

@@ -0,0 +1,3 @@
+ALTER TABLE local_site
+    DROP COLUMN federation_signed_fetch;
+

migrations/2023-11-02-120140_apub-signed-fetch/up.sql

@@ -0,0 +1,3 @@
+ALTER TABLE local_site
+    ADD COLUMN federation_signed_fetch boolean NOT NULL DEFAULT FALSE;
+

src/lib.rs

@@ -36,6 +36,7 @@ use lemmy_api_common::{
 };
 use lemmy_apub::{
   activities::{handle_outgoing_activities, match_outgoing_activities},
+  objects::instance::ApubSite,
   VerifyUrlData,
   FEDERATION_HTTP_FETCH_LIMIT,
 };
@@ -164,16 +165,20 @@ pub async fn start_lemmy_server(args: CmdArgs) -> Result<(), LemmyError> {
     serve_prometheus(prometheus, context.clone())?;
   }
 
-  let federation_config = FederationConfig::builder()
+  let mut federation_config = FederationConfig::builder();
+  federation_config
     .domain(SETTINGS.hostname.clone())
     .app_data(context.clone())
     .client(client.clone())
     .http_fetch_limit(FEDERATION_HTTP_FETCH_LIMIT)
     .debug(cfg!(debug_assertions))
     .http_signature_compat(true)
-    .url_verifier(Box::new(VerifyUrlData(context.inner_pool().clone())))
-    .build()
-    .await?;
+    .url_verifier(Box::new(VerifyUrlData(context.inner_pool().clone())));
+  if local_site.federation_signed_fetch {
+    let site: ApubSite = site_view.site.into();
+    federation_config.signed_fetch_actor(&site);
+  }
+  let federation_config = federation_config.build().await?;
 
   MATCH_OUTGOING_ACTIVITIES
     .set(Box::new(move |d, c| {