From b89342ffddae35af71c6dabc34c456fd5641c1df Mon Sep 17 00:00:00 2001
From: Dayllan Maza <dmaza@wikimedia.org>
Date: Thu, 15 Nov 2018 22:33:47 -0500
Subject: [PATCH] Add stats for block errors on create/edit actions

Monitoring block errors is behind $wgEnableBlockNoticeStats
and it is disabled by default.

The reason behind this metric is to get an idea on how
frequently blocked users attempt to edit a page. Similar tracking
is being added to MobileFrontend and VisualEditor.

Depends-On: I6bd1c95548616677e1f72ba6bcfc6f2b551c1ca6
Bug: T201717
Change-Id: I18bdb5ce61509ba3c2cea9aa6247656b9bd388e0
---
 includes/api/ApiBase.php | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/includes/api/ApiBase.php b/includes/api/ApiBase.php
index c66e5d52bb..fbb474b3e0 100644
--- a/includes/api/ApiBase.php
+++ b/includes/api/ApiBase.php
@@ -21,6 +21,7 @@
  */
 
 use Wikimedia\Rdbms\IDatabase;
+use MediaWiki\MediaWikiServices;
 
 /**
  * This abstract class implements many basic API functions, and is the base of
@@ -2069,11 +2070,41 @@ abstract class ApiBase extends ContextSource {
 		foreach ( (array)$actions as $action ) {
 			$errors = array_merge( $errors, $title->getUserPermissionsErrors( $action, $user ) );
 		}
+
 		if ( $errors ) {
+			// track block notices
+			if ( $this->getConfig()->get( 'EnableBlockNoticeStats' ) ) {
+				$this->trackBlockNotices( $errors );
+			}
+
 			$this->dieStatus( $this->errorArrayToStatus( $errors, $user ) );
 		}
 	}
 
+	/**
+	 * Keep track of errors messages resulting from a block
+	 *
+	 * @param array $errors
+	 */
+	private function trackBlockNotices( array $errors ) {
+		$errorMessageKeys = [
+			'blockedtext',
+			'blockedtext-partial',
+			'autoblockedtext',
+			'systemblockedtext',
+		];
+
+		$statsd = MediaWikiServices::getInstance()->getStatsdDataFactory();
+
+		foreach ( $errors as $error ) {
+			if ( in_array( $error[0], $errorMessageKeys ) ) {
+				$wiki = $this->getConfig()->get( 'DBname' );
+				$statsd->increment( 'BlockNotices.' . $wiki . '.MediaWikiApi.returned' );
+				break;
+			}
+		}
+	}
+
 	/**
 	 * Will only set a warning instead of failing if the global $wgDebugAPI
 	 * is set to true. Otherwise behaves exactly as self::dieWithError().
-- 
2.20.1