Add option remote inbox notifications rule processor (https://github.com/woocommerce/woocommerce-admin/pull/5206)

* Add option remote inbox notifications rule processor

* Add default option value to option rule

Co-authored-by: Rebecca Scott <me@becdetat.com>

plugins/woocommerce-admin/src/RemoteInboxNotifications/GetRuleProcessor.php

@@ -54,6 +54,8 @@ class GetRuleProcessor {
 				return new BaseLocationStateRuleProcessor();
 			case 'note_status':
 				return new NoteStatusRuleProcessor();
+			case 'option':
+				return new OptionRuleProcessor();
 		}
 
 		return new FailRuleProcessor();

plugins/woocommerce-admin/src/RemoteInboxNotifications/OptionRuleProcessor.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * Rule processor that performs a comparison operation against an option value.
+ */
+
+namespace Automattic\WooCommerce\Admin\RemoteInboxNotifications;
+
+defined( 'ABSPATH' ) || exit;
+
+/**
+ * Rule processor that performs a comparison operation against an option value.
+ */
+class OptionRuleProcessor implements RuleProcessorInterface {
+	/**
+	 * Performs a comparison operation against the option value.
+	 *
+	 * @param object $rule         The specific rule being processed by this rule processor.
+	 * @param object $stored_state Stored state.
+	 *
+	 * @return bool The result of the operation.
+	 */
+	public function process( $rule, $stored_state ) {
+		$default      = isset( $rule->default ) ? $rule->default : false;
+		$option_value = get_option( $rule->option_name, $default );
+
+		return ComparisonOperation::compare(
+			$option_value,
+			$rule->value,
+			$rule->operation
+		);
+	}
+
+	/**
+	 * Validates the rule.
+	 *
+	 * @param object $rule The rule to validate.
+	 *
+	 * @return bool Pass/fail.
+	 */
+	public function validate( $rule ) {
+		if ( ! isset( $rule->option_name ) ) {
+			return false;
+		}
+
+		if ( ! isset( $rule->value ) ) {
+			return false;
+		}
+
+		if ( ! isset( $rule->operation ) ) {
+			return false;
+		}
+
+		return true;
+	}
+}

plugins/woocommerce-admin/src/RemoteInboxNotifications/README.md

@@ -381,3 +381,18 @@ actioned.
 	"operation": "!="
 }
 ```
+
+### Option
+This passes when the option value matches the value using the operation.
+
+```
+{
+	"type": "option",
+	"option_name": "woocommerce_currency",
+	"value": "USD",
+	"default": "USD",
+	"operation": "="
+}
+```
+
+`option_name`, `value`, and `operation` are all required. `default` is not required and allows a default value to be used if the option does not exist.

plugins/woocommerce-admin/tests/remote-inbox-notifications/option-rule-processor.php

@@ -0,0 +1,60 @@
+<?php
+/**
+ * Option rule processor tests.
+ *
+ * @package WooCommerce\Admin\Tests\RemoteInboxNotifications
+ */
+
+use Automattic\WooCommerce\Admin\RemoteInboxNotifications\OptionRuleProcessor;
+
+/**
+ * class WC_Tests_RemoteInboxNotifications_OptionRuleProcessor
+ */
+class WC_Tests_RemoteInboxNotifications_OptionRuleProcessor extends WC_Unit_Test_Case {
+	/**
+	 * No default option resolves to false.
+	 *
+	 * @group fast
+	 */
+	public function test_rule_passes_for_no_default_option() {
+		$processor = new OptionRuleProcessor();
+		$rule      = json_decode(
+			'
+			{
+				"type": "option",
+				"option_name": "NON_EXISTENT_OPTION",
+				"value": false,
+				"operation": "="
+			}
+			'
+		);
+
+		$result = $processor->process( $rule, null );
+
+		$this->assertEquals( true, $result );
+	}
+
+	/**
+	 * Default option of true resolves to true.
+	 *
+	 * @group fast
+	 */
+	public function test_rule_passes_for_default_option() {
+		$processor = new OptionRuleProcessor();
+		$rule      = json_decode(
+			'
+			{
+				"type": "option",
+				"option_name": "NON_EXISTENT_OPTION",
+				"value": true,
+				"default": true,
+				"operation": "="
+			}
+			'
+		);
+
+		$result = $processor->process( $rule, null );
+
+		$this->assertEquals( true, $result );
+	}
+}