add /blogs/:username activitypub route

src/ap/blog.ts

@@ -0,0 +1,20 @@
+import { BASE_URL } from "~/config.js";
+import { Blog } from "~/db/entities/blog.js";
+
+/** Transforms the given Blog into an ActivityPub Person. It is the caller's responsibility to ensure the blog is local. */
+export function blogToActivityPub(blog: Blog) {
+  return {
+    "@context": "https://www.w3.org/ns/activitystreams",
+    type: "Person",
+    id: `${BASE_URL}/blogs/${blog.username}`,
+    inbox: `${BASE_URL}/blogs/${blog.username}/inbox`,
+    outbox: `${BASE_URL}/blogs/${blog.username}/outbox`,
+    name: blog.username,
+    preferredUsername: blog.username,
+    publicKey: {
+      id: `${BASE_URL}/blogs/${blog.username}#main-key`,
+      owner: `${BASE_URL}/blogs/${blog.username}`,
+      publicKeyPem: blog.publicKey,
+    },
+  };
+}

src/routes/ap/blog.ts

@@ -0,0 +1,31 @@
+import { RouteOptions } from "fastify";
+
+import MercuryDataSource from "~/db/index.js";
+import { Blog } from "~/db/entities/blog.js";
+import { IsNull } from "typeorm";
+import { blogToActivityPub } from "~/ap/blog.js";
+
+const route: RouteOptions = {
+  method: "GET",
+  url: "/blogs/:username",
+  handler: async (req, res) => {
+    const username = (req.params as { username: string }).username;
+
+    // Only respond to ActivityPub requests
+    if (req.headers.accept && !req.headers.accept.indexOf("application/json")) {
+      res.redirect(303, `/@${username}`);
+    }
+
+    const blog = await MercuryDataSource.getRepository(Blog).findOneBy({
+      username,
+      host: IsNull(),
+    });
+    if (!blog) {
+      return res.status(404).send({ message: "Not found" });
+    }
+
+    return res.send(blogToActivityPub(blog));
+  },
+};
+
+export default route;

src/routes/nodeinfo/nodeinfo_2.0.ts

@@ -9,13 +9,15 @@ const route: RouteOptions = {
   method: "GET",
   url: "/nodeinfo/2.0",
   handler: async (_, res) => {
-    const userCount = await MercuryDataSource.getRepository(Blog).countBy({
-      host: IsNull(),
-    });
-    const postCount = await MercuryDataSource.getRepository(Post).count({
-      relations: { blog: true },
-      where: { blog: { host: IsNull() } },
-    });
+    const [userCount, postCount] = await Promise.all([
+      MercuryDataSource.getRepository(Blog).countBy({
+        host: IsNull(),
+      }),
+      MercuryDataSource.getRepository(Post).count({
+        relations: { blog: true },
+        where: { blog: { host: IsNull() } },
+      }),
+    ]);
 
     res.send({
       version: "2.0",