applinks icon improvements

src/applinks.js

@@ -17,6 +17,7 @@ const assert = require('assert'),
     uuid = require('uuid'),
     safe = require('safetydance'),
     superagent = require('superagent'),
+    validator = require('validator'),
     jsdom = require('jsdom'),
     debug = require('debug')('box:applinks');
 
@@ -129,6 +130,13 @@ async function update(applinkId, applink) {
 
     debug(`update: ${applinkId} ${applink.upstreamUri}`, applink);
 
+    if ('icon' in applink) {
+        if (applink.icon) {
+            if (!validator.isBase64(applink.icon)) throw new BoxError(BoxError.BAD_FIELD, 'icon is not base64');
+            applink.icon = Buffer.from(applink.icon, 'base64');
+        }
+    }
+
     await amendIconAndLabel(applink);
 
     const query = 'UPDATE applinks SET label=?, icon=?, upstreamUri=?, tagsJson=?, accessRestrictionJson=? WHERE id = ?';