How can I run custom auth logic, like beforeLogin

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To modify the login functionality in Strapi, you would need to customize the users-permissions plugin and specifically the Auth controller. This is where the check for the existence of a User is made during the login process.

Here’s a general idea of how you could approach this:

  1. Locate the Auth.js file in the users-permissions plugin. The exact location of this file may vary depending on your Strapi setup, but it’s typically found in the controllers directory of the plugin.

  2. In the Auth.js file, find the function that handles user login. This function is typically named login or something similar.

  3. Inside the login function, before the user is authenticated and the login result is sent back, add a check for the specific boolean value on the user object. You can access the user object through the ctx parameter that’s passed into the function.

Here’s a simplified example of what the modified login function might look like:

async function login(ctx) {
  const user = await strapi.plugins['users-permissions'].services.user.fetch({
    id: ctx.state.user.id,
  });

  if (user.yourBooleanAttribute) {
    // Continue with the login process if the boolean value is true
  } else {
    // Return an error or redirect the user if the boolean value is false
  }
}

Please replace yourBooleanAttribute with the actual name of the boolean attribute you want to check on the user object.

Remember that this is a simplified example and the actual code may be more complex depending on your specific requirements and the existing code in the Auth.js file.

For more information on customizing controllers in Strapi, you can refer to the official Strapi documentation (https://strapi.io/documentation/developer-docs/latest/development/backend-customization.html#controllers).