Add a notification setting for likes, reposts and quotes

.github/changelog/add-reaction-email-setting

@@ -0,0 +1,4 @@
+Significance: minor
+Type: added
+
+Add a notification setting to turn off emails about likes and reposts without silencing real comments and replies.

includes/class-activitypub.php

@@ -295,6 +295,18 @@ public static function register_user_meta() {
 		);
 		\add_filter( 'get_user_option_activitypub_mailer_new_mention', array( self::class, 'user_options_default' ) );
 
+		\register_meta(
+			'user',
+			$blog_prefix . 'activitypub_mailer_new_reaction',
+			array(
+				'type'              => 'integer',
+				'description'       => 'Send a notification when someone likes, reposts, or quotes this user\'s post.',
+				'single'            => true,
+				'sanitize_callback' => 'absint',
+			)
+		);
+		\add_filter( 'get_user_option_activitypub_mailer_new_reaction', array( self::class, 'user_options_default' ) );
+
 		\register_meta(
 			'user',
 			$blog_prefix . 'activitypub_mailer_annual_report',

includes/class-mailer.php

@@ -552,6 +552,12 @@ public static function maybe_prevent_comment_notification( $maybe_notify, $comme
 			return false;
 		}
 
+		// Anything that is not a plain reply (a like, repost, or quote) follows the recipient's own
+		// notification preference. get_comment_type() reports an empty legacy type as a plain comment.
+		if ( 'comment' !== \get_comment_type( $comment ) ) {
+			return (bool) \get_user_option( 'activitypub_mailer_new_reaction', $post->post_author );
+		}
+
 		return $maybe_notify;
 	}
 }

includes/wp-admin/class-admin.php

@@ -260,6 +260,7 @@ public static function save_user_settings( $user_id ) {
 			'activitypub_mailer_new_dm',
 			'activitypub_mailer_new_follower',
 			'activitypub_mailer_new_mention',
+			'activitypub_mailer_new_reaction',
 			'activitypub_mailer_annual_report',
 			'activitypub_mailer_monthly_report',
 		);

includes/wp-admin/class-user-settings-fields.php

@@ -253,6 +253,12 @@ public static function notifications_callback() {
 					<?php \esc_html_e( 'New Mentions', 'activitypub' ); ?>
 				</label>
 			</p>
+			<p>
+				<label>
+					<input type="checkbox" name="activitypub_mailer_new_reaction" id="activitypub_mailer_new_reaction" value="1" <?php \checked( 1, \get_user_option( 'activitypub_mailer_new_reaction' ) ); ?> />
+					<?php \esc_html_e( 'Likes, Reposts and Quotes', 'activitypub' ); ?>
+				</label>
+			</p>
 			<p>
 				<label>
 					<input type="checkbox" name="activitypub_mailer_annual_report" id="activitypub_mailer_annual_report" value="1" <?php \checked( 1, \get_user_option( 'activitypub_mailer_annual_report' ) ); ?> />

tests/phpunit/tests/includes/class-test-mailer.php

@@ -101,6 +101,53 @@ public function test_comment_like_notification() {
 		$this->assertEquals( 'Default Subject', $subject );
 	}
 
+	/**
+	 * The reaction notification setting silences reaction emails (likes, reposts, quotes) without touching real replies.
+	 *
+	 * @covers ::maybe_prevent_comment_notification
+	 */
+	public function test_reaction_notification_setting() {
+		$like_id         = wp_insert_comment(
+			array(
+				'comment_post_ID' => self::$post_id,
+				'comment_type'    => 'like',
+			)
+		);
+		$quote_id        = wp_insert_comment(
+			array(
+				'comment_post_ID' => self::$post_id,
+				'comment_type'    => 'quote',
+			)
+		);
+		$reply_id        = wp_insert_comment(
+			array(
+				'comment_post_ID' => self::$post_id,
+				'comment_type'    => 'comment',
+			)
+		);
+		$legacy_reply_id = wp_insert_comment(
+			array(
+				'comment_post_ID' => self::$post_id,
+				'comment_type'    => '',
+			)
+		);
+
+		// Default (unset): reactions still notify, so behavior is unchanged for existing users.
+		$this->assertTrue( Mailer::maybe_prevent_comment_notification( true, $like_id ) );
+
+		update_user_option( self::$user_id, 'activitypub_mailer_new_reaction', '0' );
+
+		// Opt out silences every non-reply interaction, including quotes.
+		$this->assertFalse( Mailer::maybe_prevent_comment_notification( true, $like_id ) );
+		$this->assertFalse( Mailer::maybe_prevent_comment_notification( true, $quote_id ) );
+
+		// Real replies are never affected, including legacy comments stored with an empty type.
+		$this->assertTrue( Mailer::maybe_prevent_comment_notification( true, $reply_id ) );
+		$this->assertTrue( Mailer::maybe_prevent_comment_notification( true, $legacy_reply_id ) );
+
+		delete_user_option( self::$user_id, 'activitypub_mailer_new_reaction' );
+	}
+
 	/**
 	 * Test comment notification text for ActivityPub comments.
 	 *