Adding a Followers object to the Actor

See https://github.com/dariusk/rss-to-activitypub/issues/11 for more
information on why this fix is needed.

routes/admin.js

@@ -15,6 +15,7 @@ function createActor(name, domain, pubkey) {
     'type': 'Person',
     'preferredUsername': `${name}`,
     'inbox': `https://${domain}/api/inbox`,
+    'followers': `https://${domain}/u/${name}/followers`,
 
     'publicKey': {
       'id': `https://${domain}/u/${name}#main-key`,

routes/inbox.js

@@ -5,6 +5,9 @@ const express = require('express'),
       router = express.Router();
 
 function signAndSend(message, name, domain, req, res, targetDomain) { 
+  // get the URI of the actor object and append 'inbox' to it
+  let inbox = message.object.actor+'/inbox';
+  let inboxFragment = inbox.replace('https://'+targetDomain,'');
   // get the private key
   let db = req.app.get('db');
   db.get('select privkey from accounts where name = $name', {$name: `${name}@${domain}`}, (err, result) => {
@@ -15,14 +18,14 @@ function signAndSend(message, name, domain, req, res, targetDomain) {
       let privkey = result.privkey;
       const signer = crypto.createSign('sha256');
       let d = new Date();
-      let stringToSign = `(request-target): post /inbox\nhost: ${targetDomain}\ndate: ${d.toUTCString()}`;
+      let stringToSign = `(request-target): post ${inboxFragment}\nhost: ${targetDomain}\ndate: ${d.toUTCString()}`;
       signer.update(stringToSign);
       signer.end();
       const signature = signer.sign(privkey);
       const signature_b64 = signature.toString('base64');
       let header = `keyId="https://${domain}/u/${name}",headers="(request-target) host date",signature="${signature_b64}"`;
       request({
-        url: `https://${targetDomain}/inbox`,
+        url: inbox,
         headers: {
           'Host': targetDomain,
           'Date': d.toUTCString(),

routes/user.js

@@ -10,16 +10,53 @@ 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}`;
     db.get('select actor from accounts where name = $name', {$name: name}, (err, result) => {
       if (result === undefined) {
         return res.status(404).send(`No record found for ${name}.`);
       }
       else {
-        res.json(JSON.parse(result.actor));
+				let tempActor = JSON.parse(result.actor);
+				// Added this followers URI for Pleroma compatibility, see https://github.com/dariusk/rss-to-activitypub/issues/11#issuecomment-471390881
+				// New Actors should have this followers URI but in case of migration from an old version this will add it in on the fly
+				if (tempActor.followers === undefined) {
+					tempActor.followers = `https://${domain}/u/${username}/followers`;
+				}
+				res.json(tempActor);
       }
     });
   }
 });
 
+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);
+    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);
+  }
+});
+
 module.exports = router;