From 0a3040fba40d42c62ea70b7ccbade28e43ebaad5 Mon Sep 17 00:00:00 2001
From: rtkay123 <dev@kanjala.com>
Date: Wed, 16 Jul 2025 18:04:10 +0200
Subject: feat: follow activity

---
 src/server/activities.rs        |  1 +
 src/server/activities/follow.rs | 65 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+)
 create mode 100644 src/server/activities.rs
 create mode 100644 src/server/activities/follow.rs

diff --git a/src/server/activities.rs b/src/server/activities.rs
new file mode 100644
index 0000000..62d6fa2
--- /dev/null
+++ b/src/server/activities.rs
@@ -0,0 +1 @@
+pub mod follow;
diff --git a/src/server/activities/follow.rs b/src/server/activities/follow.rs
new file mode 100644
index 0000000..9148f02
--- /dev/null
+++ b/src/server/activities/follow.rs
@@ -0,0 +1,65 @@
+use activitypub_federation::{
+    config::Data, fetch::object_id::ObjectId, kinds::activity::FollowType, traits::Activity,
+};
+use async_trait::async_trait;
+use serde::{Deserialize, Serialize};
+use url::Url;
+
+use crate::{entity::user::User, error::AppError, state::AppHandle};
+
+#[derive(Deserialize, Serialize, Clone, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct Follow {
+    pub actor: ObjectId<User>,
+    pub object: ObjectId<User>,
+    #[serde(rename = "type")]
+    kind: FollowType,
+    id: Url,
+}
+
+impl Follow {
+    pub fn new(actor: ObjectId<User>, object: ObjectId<User>, id: Url) -> Follow {
+        Follow {
+            actor,
+            object,
+            kind: Default::default(),
+            id,
+        }
+    }
+}
+
+#[async_trait]
+impl Activity for Follow {
+    #[doc = " App data type passed to handlers. Must be identical to"]
+    #[doc = " [crate::config::FederationConfigBuilder::app_data] type."]
+    type DataType = AppHandle;
+
+    #[doc = " Error type returned by handler methods"]
+    type Error = AppError;
+
+    #[doc = " `id` field of the activity"]
+    fn id(&self) -> &Url {
+        todo!()
+    }
+
+    #[doc = " `actor` field of activity"]
+    fn actor(&self) -> &Url {
+        todo!()
+    }
+
+    #[doc = " Verifies that the received activity is valid."]
+    #[doc = ""]
+    #[doc = " This needs to be a separate method, because it might be used for activities"]
+    #[doc = " like `Undo/Follow`, which shouldn\'t perform any database write for the inner `Follow`."]
+    async fn verify(&self, data: &Data<Self::DataType>) -> Result<(), Self::Error> {
+        todo!()
+    }
+
+    #[doc = " Called when an activity is received."]
+    #[doc = ""]
+    #[doc = " Should perform validation and possibly write action to the database. In case the activity"]
+    #[doc = " has a nested `object` field, must call `object.from_json` handler."]
+    async fn receive(self, data: &Data<Self::DataType>) -> Result<(), Self::Error> {
+        todo!()
+    }
+}
-- 
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