Ethereum: safe-global/auth-kit CORS policy issues on localhost

Ethereum: Safe-Global/Auth Kit CORS Policy Issues on Localhost

As an Ethereum developer, you are probably familiar with the importance of cross-origin resource sharing (CORS) policies in modern web applications. However, Safe-Global/Auth Kit, a popular library for authenticating users on Ethereum, has been known to introduce CORS issues on localhost due to its use of CORS-enabled libraries such as CORS.js.

The Problem:

When using Safe-Global/Auth Kit on localhost, you may encounter CORS policy issues that prevent your application from accessing the Ethereum blockchain. This is because Safe-Global/Auth Kit relies on CORS-enabled libraries such as CORS.js to detect and handle cross-origin requests.

Workaround options:

To resolve this issue, we will explore two possible workarounds:

• Disable CORS for Safe-Global/Auth Kit – One workaround is to disable the CORS policy for Safe-Global/Auth Kit on the local host by setting the mode option in your configuration file.

• Use a different authentication library – Another workaround is to switch to a different authentication library that does not depend on CORS-enabled libraries like CORS.js.

Option 1: Disable CORS for Safe-Global/Auth Kit

You can disable the CORS policy for Safe-Global/Auth Kit by setting the mode option in your configuration file:

import { SafeGlobal } from 'safe-global';
const safeGlobal = new SafeGlobal({
mode: 'disable',
});
safeGlobal.authenticate({
// Your authentication credentials...
});

Setting mode to 'disable' will disable CORS for Safe-Global/Auth Kit on the local host. However, be aware that this may break some of your application’s functionality.

Option 2: Use a different authentication library

If you are not ready to disable CORS for Safe-Global/Auth Kit, you can explore alternative authentication libraries that do not rely on CORS-enabled libraries such as CORS.js. One option is to use the ethers.js library, which provides an authentication API that does not require CORS.

Here is an example of how you can integrate ethers.js with Safe-Global/Auth Kit:

import { SafeAuthPack } from 'safe-auth-pack';
import { SafeGlobal } from 'safe-global';
const safeAuthPack = new SafeAuthPack({
// Your authentication credentials...
});
const safeGlobal = new SafeGlobal();
safeAuthPack.authenticate(safeGlobal);

By using ethers.js with Safe-Global/Auth Kit, you can avoid CORS policy issues on the local host.

Conclusion:

While disabling CORS policy for Safe-Global/Auth Kit may seem like a viable solution, it is essential to weigh the potential benefits against the drawbacks. By exploring alternative authentication libraries or adjusting your configuration settings, you can ensure a smooth user experience on the local host without relying on CORS-enabled libraries.

Tips and Recommendations:

• When switching to a different authentication library, be sure to update all dependencies in your project.

• Consider using ethers.js with Safe-Global/Auth Kit for more reliable, cross-origin-aware authentication.

• Please note that some features or functionality may be affected by CORS policy changes.

By implementing these workarounds, you can ensure a smooth user experience on the local host while maintaining optimal performance.