feat: authentication callback

app/routes/ecom/auth-callback.js

@@ -1 +1,34 @@
 'use strict'
+
+// log on files
+const logger = require('console-files')
+
+module.exports = appSdk => {
+  return (req, res) => {
+    // E-Com Plus Store ID from request header
+    const storeId = parseInt(req.get('x-store-id'), 10)
+
+    // handle callback with E-Com Plus app SDK
+    // https://github.com/ecomclub/ecomplus-app-sdk
+    appSdk.handleCallback(storeId, req.body)
+
+      .then(({ isNew, authenticationId }) => {
+        // authentication tokens were updated
+        res.status(204)
+        res.end()
+      })
+
+      .catch(err => {
+        if (typeof err.code === 'string' && !err.code.startsWith('SQLITE_CONSTRAINT')) {
+          // debug SQLite errors
+          logger.error(err)
+        }
+        res.status(500)
+        let { message } = err
+        res.send({
+          error: 'auth_callback_error',
+          message
+        })
+      })
+  }
+}