feat: make regular api tokens revocable

.env.example

@@ -63,3 +63,6 @@ S3_ACCESS_KEY_ID=your_s3_access_key_id_here
 S3_SECRET_ACCESS_KEY=your_s3_secret_access_key_here
 S3_BUCKET=your_s3_bucket_name_here
 S3_ENDPOINT=https://<ACCOUNT_ID>.r2.cloudflarestorage.com
+
+# Revocation key for token revocation
+HKA_REVOCATION_KEY=your_hka_revocation_key_here

app/controllers/api/internal/revocations_controller.rb

@@ -1,26 +1,52 @@
 module Api
   module Internal
     class RevocationsController < Api::Internal::ApplicationController
+      REGULAR_KEY_REGEX = /\A[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}\z/i
+      ADMIN_KEY_REGEX = /\Ahka_[0-9a-f]{64}\z/
+
       def create
         token = params[:token]
 
         return head 400 unless token.present?
 
-        admin_api_key = AdminApiKey.active.find_by(token:)
-
-        return render json: { success: false } unless admin_api_key.present?
+        key, user = revocable_key_and_owner(token)
 
-        admin_api_key.revoke!
+        return render json: { success: false } unless key.present?
 
-        user = admin_api_key.user
+        revoke_key!(key)
 
         render json: {
           success: true,
           owner_email: user.email_addresses.first&.email,
-          key_name: admin_api_key.name
+          key_name: key.name
         }.compact_blank
       end
 
+      private
+
+      def revocable_key_and_owner(token)
+        if token.match?(ADMIN_KEY_REGEX)
+          key = AdminApiKey.active.find_by(token:)
+          return [ key, key&.user ]
+        end
+
+        if token.match?(REGULAR_KEY_REGEX)
+          key = ApiKey.find_by(token:)
+          return [ key, key&.user ]
+        end
+
+        [ nil, nil ]
+      end
+
+      def revoke_key!(key)
+        return key.revoke! if key.is_a?(AdminApiKey)
+
+        key.update!(
+          token: SecureRandom.uuid_v4,
+          name: "#{key.name}_revoked_#{SecureRandom.hex(8)}"
+        )
+      end
+
       private def authenticate!
         res = authenticate_with_http_token do |token, _|
           ActiveSupport::SecurityUtils.secure_compare(token, ENV["HKA_REVOCATION_KEY"])