Add new image functions check

includes/Checker/Checks/Performance/Enqueued_Resources_Check.php

@@ -31,7 +31,10 @@ class Enqueued_Resources_Check extends Abstract_PHP_CodeSniffer_Check {
 	 * @return array The categories for the check.
 	 */
 	public function get_categories() {
-		return array( Check_Categories::CATEGORY_PLUGIN_REPO );
+		return array(
+			Check_Categories::CATEGORY_PLUGIN_REPO,
+			Check_Categories::CATEGORY_PERFORMANCE
+		);
 	}
 
 	/**

includes/Checker/Checks/Performance/Image_Functions_Check.php

@@ -0,0 +1,78 @@
+<?php
+/**
+ * Class Image_Functions_Check.
+ *
+ * @package plugin-check
+ */
+
+namespace WordPress\Plugin_Check\Checker\Checks\Performance;
+
+use WordPress\Plugin_Check\Checker\Check_Categories;
+use WordPress\Plugin_Check\Checker\Check_Result;
+use WordPress\Plugin_Check\Checker\Checks\Abstract_PHP_CodeSniffer_Check;
+use WordPress\Plugin_Check\Traits\Stable_Check;
+
+/**
+ * Check for running WordPress image functions sniffs.
+ *
+ * @since 1.3.0
+ */
+class Image_Functions_Check extends Abstract_PHP_CodeSniffer_Check {
+
+	use Stable_Check;
+
+	/**
+	 * Gets the categories for the check.
+	 *
+	 * Every check must have at least one category.
+	 *
+	 * @since 1.3.0
+	 *
+	 * @return array The categories for the check.
+	 */
+	public function get_categories() {
+		return array( Check_Categories::CATEGORY_PERFORMANCE );
+	}
+
+	/**
+	 * Returns an associative array of arguments to pass to PHPCS.
+	 *
+	 * @since 1.3.0
+	 *
+	 * @param Check_Result $result The check result to amend, including the plugin context to check.
+	 * @return array An associative array of PHPCS CLI arguments.
+	 */
+	protected function get_args( Check_Result $result ) {
+		return array(
+			'extensions' => 'php',
+			'standard'   => 'PluginCheck',
+			'sniffs'     => 'PluginCheck.CodeAnalysis.ImageFunctions',
+		);
+	}
+
+	/**
+	 * Gets the description for the check.
+	 *
+	 * Every check must have a short description explaining what the check does.
+	 *
+	 * @since 1.3.0
+	 *
+	 * @return string Description.
+	 */
+	public function get_description(): string {
+		return __( 'Checks whether images are inserted using recommended functions.', 'plugin-check' );
+	}
+
+	/**
+	 * Gets the documentation URL for the check.
+	 *
+	 * Every check must have a URL with further information about the check.
+	 *
+	 * @since 1.3.0
+	 *
+	 * @return string The documentation URL.
+	 */
+	public function get_documentation_url(): string {
+		return __( 'https://developer.wordpress.org/plugins/', 'plugin-check' );
+	}
+}

includes/Checker/Default_Check_Repository.php

@@ -60,6 +60,7 @@ private function register_default_checks() {
 				'trademarks'                 => new Checks\Plugin_Repo\Trademarks_Check(),
 				'non_blocking_scripts'       => new Checks\Performance\Non_Blocking_Scripts_Check(),
 				'offloading_files'           => new Checks\Plugin_Repo\Offloading_Files_Check(),
+				'image_functions'            => new Checks\Performance\Image_Functions_Check(),
 			)
 		);
 

phpcs-sniffs/PluginCheck/Sniffs/CodeAnalysis/ImageFunctionsSniff.php

@@ -0,0 +1,95 @@
+<?php
+/**
+ * ImageFunctionsSniff
+ *
+ * Based on code from {@link https://github.com/WordPress/WordPress-Coding-Standards}
+ * which is licensed under {@link https://opensource.org/licenses/MIT}.
+ *
+ * @package PluginCheck
+ */
+
+namespace PluginCheckCS\PluginCheck\Sniffs\CodeAnalysis;
+
+use PHP_CodeSniffer\Exceptions\RuntimeException;
+use PHP_CodeSniffer\Util\Tokens;
+use PHPCSUtils\Tokens\Collections;
+use PHPCSUtils\Utils\TextStrings;
+use WordPressCS\WordPress\Sniff;
+
+/**
+ * Makes sure images are inserted using recommended functions and not explicitly echo'd.
+ *
+ * @since 1.3.0
+ */
+final class ImageFunctionsSniff extends Sniff {
+
+	/**
+	 * Returns an array of tokens this test wants to listen for.
+	 *
+	 * @return array
+	 */
+	public function register() {
+		$targets   = Collections::textStringStartTokens();
+		$targets[] = \T_INLINE_HTML;
+
+		return $targets;
+	}
+
+	/**
+	 * Processes this test, when one of its tokens is encountered.
+	 *
+	 * @param int $stackPtr The position of the current token in the stack.
+	 *
+	 * @return int|void Integer stack pointer to skip forward or void to continue
+	 *                  normal file processing.
+	 */
+	public function process_token( $stackPtr ) {
+
+		$end_ptr = $stackPtr;
+		$content = $this->tokens[ $stackPtr ]['content'];
+		if ( \T_INLINE_HTML !== $this->tokens[ $stackPtr ]['code'] ) {
+			try {
+				$end_ptr = TextStrings::getEndOfCompleteTextString( $this->phpcsFile, $stackPtr );
+				$content = TextStrings::getCompleteTextString( $this->phpcsFile, $stackPtr );
+			} catch ( RuntimeException $e ) {
+				// Parse error/live coding.
+				return;
+			}
+		}
+
+		if ( preg_match_all( '#<img[^>]*(?<=src=)#', $content, $matches, \PREG_OFFSET_CAPTURE ) > 0 ) {
+			foreach ( $matches[0] as $match ) {
+				$this->phpcsFile->addError(
+					'Images should be added using wp_get_attachment_image() or similar functions',
+					$this->find_token_in_multiline_string( $stackPtr, $content, $match[1] ),
+					'NonEnqueuedImage'
+				);
+			}
+		}
+
+		return ( $end_ptr + 1 );
+	}
+
+	/**
+	 * Find the exact token on which the error should be reported for multi-line strings.
+	 *
+	 * @param int    $stackPtr The position of the current token in the stack.
+	 * @param string $content The complete, potentially multi-line, text string.
+	 * @param int    $match_offset The offset within the content at which the match was found.
+	 *
+	 * @return int The stack pointer to the token containing the start of the match.
+	 */
+	private function find_token_in_multiline_string( $stackPtr, $content, $match_offset ) {
+		$newline_count = 0;
+		if ( $match_offset > 0 ) {
+			$newline_count = substr_count( $content, "\n", 0, $match_offset );
+		}
+
+		// Account for heredoc/nowdoc text starting at the token *after* the opener.
+		if ( isset( Tokens::$heredocTokens[ $this->tokens[ $stackPtr ]['code'] ] ) === true ) {
+			++$newline_count;
+		}
+
+		return ( $stackPtr + $newline_count );
+	}
+}

phpcs-sniffs/PluginCheck/Tests/CodeAnalysis/ImageFunctionsUnitTest.inc

@@ -0,0 +1,27 @@
+<img src="https://example.com/image.jpeg" />
+
+<?php
+
+?>img src="https://example.com/image.jpeg" /><?php
+
+echo '<img src="' . SOMEIMAGE . '">';
+
+$double_quoted = "<img src=\"{$img}\">";
+
+$double_quoted = "<img src='{$img}'>";
+
+$content = <<<'EOD'
+<img src="https://example.com/image.jpeg">
+EOD;
+
+// Test multi-line text string.
+echo '<img
+	src="' . $img . '"/>';
+
+// Test multi-line text string with multiple issues.
+echo '<img
+	src="https://example.com/image.jpeg"/>
+	<img src="https://example.com/image.jpeg"/>
+	<img
+	src="https://example.com/image.jpeg"/>
+	';

phpcs-sniffs/PluginCheck/Tests/CodeAnalysis/ImageFunctionsUnitTest.php

@@ -0,0 +1,44 @@
+<?php
+/**
+ * Unit tests for ImageFunctionsSniff.
+ *
+ * @package PluginCheck
+ */
+
+namespace PluginCheckCS\PluginCheck\Tests\CodeAnalysis;
+
+use PHP_CodeSniffer\Tests\Standards\AbstractSniffUnitTest;
+
+/**
+ * Unit tests for ImageFunctionsSniff.
+ */
+final class ImageFunctionsUnitTest extends AbstractSniffUnitTest {
+
+	/**
+	 * Returns the lines where errors should occur.
+	 *
+	 * @return array <int line number> => <int number of errors>
+	 */
+	public function getErrorList() {
+		return array(
+			1  => 1,
+			7  => 1,
+			9  => 1,
+			11 => 1,
+			14 => 1,
+			18 => 1,
+			22 => 1,
+			24 => 1,
+			25 => 1,
+		);
+	}
+
+	/**
+	 * Returns the lines where warnings should occur.
+	 *
+	 * @return array <int line number> => <int number of warnings>
+	 */
+	public function getWarningList() {
+		return array();
+	}
+}

phpcs-sniffs/PluginCheck/ruleset.xml

@@ -5,5 +5,6 @@
 
 	<rule ref="PluginCheck.CodeAnalysis.EnqueuedResourceOffloading" />
 	<rule ref="PluginCheck.CodeAnalysis.Offloading" />
+	<rule ref="PluginCheck.CodeAnalysis.ImageFunctions" />
 
 </ruleset>

tests/phpunit/testdata/plugins/test-plugin-image-functions-with-errors/load.php

@@ -0,0 +1,24 @@
+<?php
+/**
+ * Plugin Name: Test Plugin Image Functions check with errors
+ * Plugin URI: https://github.com/wordpress/plugin-check
+ * Description: Test plugin for the Image Functions check.
+ * Requires at least: 6.0
+ * Requires PHP: 5.6
+ * Version: 1.0.0
+ * Author: WordPress Performance Team
+ * Author URI: https://make.wordpress.org/performance/
+ * License: GPLv2 or later
+ * License URI: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * Text Domain: test-plugin-image-functions-with-errors
+ *
+ * @package test-plugin-image-functions-with-errors
+ */
+
+?>
+
+<img src="https://example.com/image.jpeg" />
+
+<?php
+
+echo '<img src="https://example.com/image.jpeg" />';

tests/phpunit/testdata/plugins/test-plugin-image-functions-without-errors/load.php

@@ -0,0 +1,23 @@
+<?php
+/**
+ * Plugin Name: Test Plugin Image Functions check without errors
+ * Plugin URI: https://github.com/wordpress/plugin-check
+ * Description: Test plugin for the Image Functions check.
+ * Requires at least: 6.0
+ * Requires PHP: 5.6
+ * Version: 1.0.0
+ * Author: WordPress Performance Team
+ * Author URI: https://make.wordpress.org/performance/
+ * License: GPLv2 or later
+ * License URI: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * Text Domain: test-plugin-image-functions-without-errors
+ *
+ * @package test-plugin-image-functions-without-errors
+ */
+
+add_action(
+	'wp_body_open',
+	function() {
+		echo wp_get_attachment_image( 123 );
+	}
+);

tests/phpunit/tests/Checker/Checks/Image_Functions_Check_Tests.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * Tests for the Image_Functions_Check class.
+ *
+ * @package plugin-check
+ */
+
+use WordPress\Plugin_Check\Checker\Check_Context;
+use WordPress\Plugin_Check\Checker\Check_Result;
+use WordPress\Plugin_Check\Checker\Checks\Performance\Image_Functions_Check;
+
+class Image_Functions_Check_Tests extends WP_UnitTestCase {
+
+	public function test_run_with_errors() {
+		$check         = new Image_Functions_Check();
+		$check_context = new Check_Context( UNIT_TESTS_PLUGIN_DIR . 'test-plugin-image-functions-with-errors/load.php' );
+		$check_result  = new Check_Result( $check_context );
+
+		$check->run( $check_result );
+
+		$errors = $check_result->get_errors();
+
+		$this->assertNotEmpty( $errors );
+		$this->assertArrayHasKey( 'load.php', $errors );
+		$this->assertEquals( 2, $check_result->get_error_count() );
+	}
+
+	public function test_run_without_errors() {
+		$check         = new Image_Functions_Check();
+		$check_context = new Check_Context( UNIT_TESTS_PLUGIN_DIR . 'test-plugin-image-functions-without-errors/load.php' );
+		$check_result  = new Check_Result( $check_context );
+
+		$check->run( $check_result );
+
+		$errors = $check_result->get_errors();
+
+		$this->assertEmpty( $errors );
+		$this->assertEquals( 0, $check_result->get_error_count() );
+	}
+}