fix: author validation

Author: mvayngrib

lib/validator.js

@@ -10,10 +10,13 @@ const utils = require('./utils')
 const types = require('./types')
 const errors = require('./errors')
 const MESSAGE_TYPE = require('./constants').TYPES.MESSAGE
-const PERMALINK = constants.PERMALINK
-const PREVLINK = constants.PREVLINK
-const SIG = constants.SIG
-const TYPE = constants.TYPE
+const {
+  PERMALINK,
+  PREVLINK,
+  SIG,
+  TYPE,
+  AUTHOR
+} = require('@tradle/constants')
 
 /**
  * message / object validation
@@ -140,16 +143,22 @@ module.exports = function validator (node) {
   }
 
   function checkAuthentic (wrapper, cb) {
-    const object = wrapper.object
+    const { object, link, author } = wrapper
     const sig = object[SIG]
-    const link = wrapper.link
+    if (object[AUTHOR] !== author.permalink) {
+      return cb(new errors.Author({
+        author: object[AUTHOR],
+        sig
+      }))
+    }
+
     utils.extractSigPubKey(object, function (err, signingKey) {
       if (err || !signingKey) return cb(new errors.InvalidSignature({ sig }))
 
       const pubKey = utils.findPubKey(wrapper.author.object, signingKey)
       if (!pubKey) {
         return cb(new errors.Author({
-          author: wrapper.author.link,
+          author: author.permalink,
           sig: sig
         }))
       }