Implement HMAC validator

[sndrgrdn]

This will add functionality to verify HMAC signatures from the webhooks that are received.

There are specs available for this new behaviour.

[crrood]

Hi Sander,

Thanks for adding this functionality, it looks good to me.

Have you tested it in the sandbox environment, using a real-time HMAC signature?

Best,
Colin

[sndrgrdn]

Have you tested it in the sandbox environment, using a real-time HMAC signature?

I'm currently implementing Adyen into our webshop and needed it to verify webhooks. so yes this is being testing in the sandbox environment with real-time HMAC signatures :)

To give an example how it is being used in a Rails project, I included a snippet below:

hmac_key = 'YOUR_HMAC_KEY'
validator = Adyen::Utils::HmacValidator.new

params['notificationItems'].each do |notification_item|
  request_item = notification_item['NotificationRequestItem']
  next unless validator.validate(request_item, hmac_key)

  # Call some worker or other business logic here
end

render :text => '[accepted]'

[crrood]

Hi Sander,

Okay, sounds good - I've approved the PR, just need one of my colleagues to approve as well and we'll merge it.

Best,
Colin

[rikterbeek]

Hi @sndrgrdn,

Many thanks for this PR!. Definitely we wanted to add so great that you have done a PR for this.
As we are wanting to make this feature similar across all libraries could you adjust the naming of the methods ? For the rest it looks great :)

Regards,
Rik
Adyen