better handle different accept headers

src/index.ts

@@ -4,7 +4,7 @@ import { toCollection as getOutbox } from "./outbox.js";
 import { getById as getUserById, getNickname, get as getUserByNickname, getId as getUserId, User } from "./user.js";
 import { Routes } from "./router.js";
 import { getBySlug as getArticleBySlug, getById } from "./article.js";
-import { userToPerson, TYPE as ACTIVITYPUB_TYPE, handleInboxPost, createArticleObject, CONTEXT, createArticleActivity } from "./activity.js";
+import { userToPerson, TYPE as ACTIVITYPUB_TYPE, handleInboxPost, createArticleObject, CONTEXT, createArticleActivity, TYPE } from "./activity.js";
 import { handleFollowerGet } from "./follower.js";
 import { handleWebfingerGet } from "./net.js";
 
@@ -22,6 +22,13 @@ app.get(Routes.object, async (req, res) => {
   const article = await getById(parseInt(req.params.id));
 
   if (article) {
+    if (req.accepts("html")) {
+      res.redirect(`/${article.slug}.html`);
+    }
+    else if (req.accepts(["text/plain", "text/markdown"])) {
+      res.redirect(`/${article.slug}.md`);
+    }
+    else {
       const nickname = await getNickname(article.users_id) as string;
 
       const obj = createArticleObject(article, nickname);
@@ -30,6 +37,7 @@ app.get(Routes.object, async (req, res) => {
       res.append("Content-Type", ACTIVITYPUB_TYPE);
       res.send(JSON.stringify(obj, null, 4));
     }
+  }
   else {
     res.status(404).end();
   }
@@ -45,12 +53,20 @@ app.get(Routes.activity, async (req, res) => {
     const article = await getById(id);
 
     if (article) {
+      if (req.accepts("html")) {
+        res.redirect(`/${article.slug}.html`);
+      }
+      else if (req.accepts(["text/plain", "text/markdown"])) {
+        res.redirect(`/${article.slug}.md`);
+      }
+      else {
         const user = await getUserById(article.users_id) as User;
         const activity = createArticleActivity(article, user);
 
         res.append("Content-Type", ACTIVITYPUB_TYPE);
         res.send(JSON.stringify(activity, null, 4));
       }
+    }
     else {
       res.status(404).end();
     }