From 5b0427ad59cc373a92c34fb8380fd9b26d5ab367 Mon Sep 17 00:00:00 2001
From: miraikumiko <miraikumiko@disroot.org>
Date: Mon, 2 Jun 2025 17:31:39 +0200
Subject: [PATCH] Add activitypub.ex

---
 lib/nulla/activitypub.ex | 84 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 lib/nulla/activitypub.ex

diff --git a/lib/nulla/activitypub.ex b/lib/nulla/activitypub.ex
new file mode 100644
index 0000000..85647e1
--- /dev/null
+++ b/lib/nulla/activitypub.ex
@@ -0,0 +1,84 @@
+defmodule Nulla.ActivityPub do
+  @spec context() :: list()
+  defp context do
+    [
+      "https://www.w3.org/ns/activitystreams",
+      "https://w3id.org/security/v1",
+      Jason.OrderedObject.new(
+        manuallyApprovesFollowers: "as:manuallyApprovesFollowers",
+        toot: "http://joinmastodon.org/ns#",
+        featured: %{"@id" => "toot:featured", "@type" => "@id"},
+        featuredTags: %{"@id" => "toot:featuredTags", "@type" => "@id"},
+        alsoKnownAs: %{"@id" => "as:alsoKnownAs", "@type" => "@id"},
+        movedTo: %{"@id" => "as:movedTo", "@type" => "@id"},
+        schema: "http://schema.org#",
+        PropertyValue: "schema:PropertyValue",
+        value: "schema:value",
+        discoverable: "toot:discoverable",
+        suspended: "toot:suspended",
+        memorial: "toot:memorial",
+        indexable: "toot:indexable",
+        attributionDomains: %{"@id" => "toot:attributionDomains", "@type" => "@id"},
+        Hashtag: "as:Hashtag",
+        focalPoint: %{"@container" => "@list", "@id" => "toot:focalPoint"}
+      )
+    ]
+  end
+
+  @spec ap_user(String.t(), Nulla.Users.User.t()) :: Jason.OrderedObject.t()
+  def ap_user(domain, user) do
+    Jason.OrderedObject.new([
+      "@context": context(),
+      id: "https://#{domain}/@#{user.username}",
+      type: "Person",
+      following: "https://#{domain}/@#{user.username}/following",
+      followers: "https://#{domain}/@#{user.username}/followers",
+      inbox: "https://#{domain}/@#{user.username}/inbox",
+      outbox: "https://#{domain}/@#{user.username}/outbox",
+      featured: "https://#{domain}/@#{user.username}/collections/featured",
+      preferredUsername: user.username,
+      name: user.realname,
+      summary: user.bio,
+      url: "https://#{domain}/@#{user.username}",
+      manuallyApprovesFollowers: user.follow_approval,
+      discoverable: user.is_discoverable,
+      indexable: user.is_indexable,
+      published: DateTime.to_iso8601(user.inserted_at),
+      memorial: user.is_memorial,
+      publicKey: Jason.OrderedObject.new(
+        id: "https://#{domain}/@#{user.username}#main-key",
+        owner: "https://#{domain}/@#{user.username}",
+        publicKeyPem: user.public_key
+      ),
+      tag: Enum.map(user.tags, fn tag ->
+          Jason.OrderedObject.new(
+            type: "Hashtag",
+            href: "https://#{domain}/tags/#{tag}",
+            name: "##{tag}"
+          )
+        end),
+      attachment: Enum.map(user.fields, fn {name, value} ->
+          Jason.OrderedObject.new(
+            type: "PropertyValue",
+            name: name,
+            value: value
+          )
+        end),
+      endpoints: Jason.OrderedObject.new(
+        sharedInbox: "https://#{domain}/inbox"
+      ),
+      icon: Jason.OrderedObject.new(
+        type: "Image",
+        mediaType: MIME.from_path(user.avatar),
+        url: "https://#{domain}#{user.avatar}"
+      ),
+      image: Jason.OrderedObject.new(
+        type: "Image",
+        mediaType: MIME.from_path(user.banner),
+        url: "https://#{domain}#{user.banner}"
+      ),
+      "vcard:bday": user.birthday,
+      "vcard:Address": user.location
+    ])
+  end
+end