Support validating proof with domain expressed as an array.

Author: dlongley

CHANGELOG.md

@@ -1,5 +1,10 @@
 # jsonld-signatures ChangeLog
 
+## 11.4.0 - 2024-12-dd
+
+### Added
+- Add support for validating proof with `domain` expressed as an array.
+
 ## 11.3.2 - 2024-11-06
 
 ### Fixed

lib/purposes/AuthenticationProofPurpose.js

@@ -25,14 +25,23 @@ module.exports = class AuthenticationProofPurpose extends
     try {
       // check challenge
       if(proof.challenge !== this.challenge) {
-        throw new Error('The challenge is not as expected; ' +
+        throw new Error(
+          'The challenge is not as expected; ' +
           `challenge="${proof.challenge}", expected="${this.challenge}"`);
       }
 
       // check domain
-      if(this.domain !== undefined && proof.domain !== this.domain) {
-        throw new Error('The domain is not as expected; ' +
-          `domain="${proof.domain}", expected="${this.domain}"`);
+      if(this.domain !== undefined) {
+        // `proof.domain` must equal `this.domain` OR if `proof.domain` is
+        // an array, the array must include `this.domain` as an element
+        const {domain} = proof;
+        if(!(domain === this.domain ||
+          (Array.isArray(domain) && domain.includes(this.domain)))) {
+          throw new Error(
+            'The domain is not as expected; ' +
+            `domain=${JSON.stringify(domain)}, ` +
+            `expected=${JSON.stringify(this.domain)}`);
+        }
       }
 
       return super.validate(