Add Followers reference to Actor object

This is for Pleroma compatibility per

https://github.com/dariusk/rss-to-activitypub/issues/11#issuecomment-471390881

And fixes #11.

routes/api.js

@@ -97,6 +97,7 @@ function createActor(name, domain, pubkey, displayName, imageUrl, description) {
     'type': 'Person',
     'preferredUsername': `${name}`,
     'inbox': `https://${domain}/api/inbox`,
+    'followers': `https://${domain}/u/${name}/followers`,
     'name': displayName,
     'publicKey': {
       'id': `https://${domain}/u/${name}#main-key`,

routes/user.js

@@ -10,17 +10,23 @@ router.get('/:name', function (req, res) {
   else {
     let db = req.app.get('db');
     let domain = req.app.get('domain');
+    let username = name;
     name = `${name}@${domain}`;
     let result = db.prepare('select actor from accounts where name = ?').get(name);
     if (result === undefined) {
       return res.status(404).json(`No record found for ${name}.`);
     }
     else if (req.headers.accept && (req.headers.accept.includes('application/activity+json') || req.headers.accept.includes('application/json') || req.headers.accept.includes('application/json+ld'))) {
-      res.json(JSON.parse(result.actor));
+      let tempActor = JSON.parse(result.actor);
+      // Added this followers URI for Pleroma compatibility, see https://github.com/dariusk/rss-to-activitypub/issues/11#issuecomment-471390881
+      // New Actors should have this followers URI but in case of migration from an old version this will add it in on the fly
+      if (tempActor.followers === undefined) {
+        tempActor.followers = `https://${domain}/u/${username}/followers`,
+      }
+      res.json(tempActor);
     }
     else {
       let actor = JSON.parse(result.actor);
-      let username = name.replace('@'+domain,'');
       let resultFeed = db.prepare('select content, feed from feeds where username = ?').get(username);
       if (resultFeed === undefined) {
         return res.status(404).json(`Something went very wrong!`);
@@ -41,4 +47,36 @@ router.get('/:name', function (req, res) {
   }
 });
 
+router.get('/:name/followers', function (req, res) {
+  let name = req.params.name;
+  if (!name) {
+    return res.status(400).send('Bad request.');
+  }
+  else {
+    let db = req.app.get('db');
+    let domain = req.app.get('domain');
+    let result = db.prepare('select followers from accounts where name = ?').get(`${name}@${domain}`);
+    let followers = JSON.parse(result.followers);
+    // console.log(followers);
+    if (!followers) {
+      followers = [];
+    }
+    let followersCollection = {
+      "type":"OrderedCollection",
+      "totalItems":followers.length,
+      "id":`https://${domain}/u/${name}/followers`,
+      "first": {
+        "type":"OrderedCollectionPage",
+        "totalItems":followers.length,
+        "partOf":`https://${domain}/u/${name}/followers`,
+        "orderedItems": followers,
+        "id":`https://${domain}/u/${name}/followers?page=1`
+      },
+      "@context":["https://www.w3.org/ns/activitystreams"]
+    };
+    res.json(followersCollection);
+    //res.json(JSON.parse(result.actor));
+  }
+});
+
 module.exports = router;