camo: include subdomains of whitelisted domains in whitelist

src/camo.js

@@ -6,9 +6,9 @@ import { CamoConfig } from './configuration/camoconfig';
 const LOGGER = require('@calzoneman/jsli')('camo');
 
 function isWhitelisted(camoConfig: CamoConfig, url: string): boolean {
-    const whitelistedDomains = camoConfig.getWhitelistedDomains();
+    const whitelistedDomains = camoConfig.getWhitelistedDomainsRegexp();
     const parsed = urlparse.parse(url);
-    return whitelistedDomains.includes(parsed.hostname);
+    return whitelistedDomains.test('.' + parsed.hostname);
 }
 
 export function camoify(camoConfig: CamoConfig, url: string): string {

src/configuration/camoconfig.js

@@ -1,3 +1,5 @@
+const SPECIALCHARS = /([\\\.\?\+\*\$\^\|\(\)\[\]\{\}])/g;
+
 class CamoConfig {
     constructor(config = { camo: { enabled: false } }) {
         this.config = config.camo;
@@ -30,6 +32,17 @@ class CamoConfig {
         return this.config['whitelisted-domains'] || [];
     }
 
+    getWhitelistedDomainsRegexp() {
+        const domains = this.getWhitelistedDomains()
+                .map(d => '\\.' + d.replace(SPECIALCHARS, '\\$1') + '$');
+        if (domains.length === 0) {
+            // If no whitelist, match nothing
+            return new RegExp('$^');
+        }
+
+        return new RegExp(domains.join('|'), 'i');
+    }
+
     getEncoding() {
         return this.config.encoding || 'url';
     }