Fix/handle non existent author

CHANGELOG.md

@@ -3,6 +3,12 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- If a post has an author that no longer exists, the authorship of that post is re-allocated to the user with ID matching the `archive_author` option (if that options exists)
+
 ## [6.0.2] - 2024-12-13
 
 ### Fixed

app/Theme/FixNonExistentAuthors.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace GovUKBlogs\Theme;
+
+class FixNonExistentAuthors implements \Dxw\Iguana\Registerable
+{
+	public function register()
+	{
+		add_action('gds_byline', [$this, 'replaceAbsentAuthor']);
+	}
+
+	public function replaceAbsentAuthor()
+	{
+		global $post;
+		$post_author_id = get_post_field('post_author', $post->ID);
+		if ($post_author_id > 1) {
+			$post_author = get_user_by('id', $post_author_id);
+			if (!($post_author)) {
+				error_log("author of post {$post->ID} is deleted user $post_author_id", 0);
+				add_filter('wp_insert_post_data', [$this, 'setArchiveAuthor'], 99, 2);
+				wp_update_post($post);
+			}
+		}
+	}
+
+	public function setArchiveAuthor($postData, $postArray)
+	{
+		$fix_types = ["page", "post", "attachment"];
+
+		if (!in_array($postData['post_type'], $fix_types)) {
+			return $postData;
+		}
+
+		$archive_user_option = get_network_option(null, 'archive_author');
+
+		if (!empty($archive_user_option)) {
+			if (is_int($archive_user_option)) {
+				$archive_author_id = $archive_user_option;
+			} elseif (is_string($archive_user_option) && ctype_digit($archive_user_option)) {
+				$archive_author_id = intval($archive_user_option);
+			}
+			if (!empty($archive_author_id)) {
+				$postData['post_author'] = $archive_author_id;
+				if (taxonomy_exists('author')) {
+					wp_delete_object_term_relationships($postArray['ID'], 'author');
+				}
+			}
+		}
+		return $postData;
+	}
+}

app/di.php

@@ -26,3 +26,4 @@
 ));
 $registrar->addInstance(new \GovUKBlogs\Theme\ThemeSetup());
 $registrar->addInstance(new \GovUKBlogs\Theme\OldRootsCleanup());
+$registrar->addInstance(new \GovUKBlogs\Theme\FixNonExistentAuthors());

lib/byline.php

@@ -3,6 +3,7 @@
 # Display the author for a post, using coauthors if available and falling back to the WordPress user if not.
 function gds_byline()
 {
+	do_action('gds_byline');
 	?>
 	<span class="govuk-visually-hidden">Posted by: </span>
 	<?php

spec/theme/fix_not_existent_authors.spec.php

@@ -0,0 +1,153 @@
+<?php
+
+describe(\GovUKBlogs\Theme\FixNonExistentAuthors::class, function () {
+	beforeEach(function () {
+		$this->fixNonExistentAuthors = new \GovUKBlogs\Theme\FixNonExistentAuthors();
+	});
+
+	it('implements the Registerable interface', function () {
+		expect($this->fixNonExistentAuthors)->toBeAnInstanceOf(\Dxw\Iguana\Registerable::class);
+	});
+
+	describe('->register()', function () {
+		it('adds the action', function () {
+			allow('add_action')->toBeCalled();
+			expect('add_action')->toBeCalled()->once()->with('gds_byline', [$this->fixNonExistentAuthors, 'replaceAbsentAuthor']);
+			$this->fixNonExistentAuthors->register();
+		});
+	});
+
+	describe('->replaceAbsentAuthor()', function () {
+		context('the post author ID is 1', function () {
+			it('does nothing', function () {
+				global $post;
+				$post = (object) [
+					"ID" => 123
+				];
+				allow('get_post_field')->toBeCalled()->andReturn(1);
+				expect('wp_update_post')->not->toBeCalled();
+
+				$this->fixNonExistentAuthors->replaceAbsentAuthor();
+			});
+		});
+		context('the post author ID is greater than 1', function () {
+			context('but the user exists', function () {
+				it('does nothing', function () {
+					global $post;
+					$post = (object) [
+						"ID" => 123
+					];
+					allow('get_post_field')->toBeCalled()->andReturn(2);
+					allow('get_user_by')->toBeCalled()->andReturn((object) [
+						"ID" => 2,
+						"user_login" => "valid_user"
+					]);
+					expect('wp_update_post')->not->toBeCalled();
+
+					$this->fixNonExistentAuthors->replaceAbsentAuthor();
+				});
+			});
+			context('and the user does not exist', function () {
+				it('adds the filter and calls update_post', function () {
+					global $post;
+					$post = (object) [
+						"ID" => 123
+					];
+					allow('get_post_field')->toBeCalled()->andReturn(2);
+					allow('get_user_by')->toBeCalled()->andReturn(false);
+					allow('add_filter')->toBeCalled();
+					allow('error_log')->toBeCalled();
+					expect('error_log')->toBeCalled()->once()->with('author of post 123 is deleted user 2', 0);
+					expect('add_filter')->toBeCalled()->once()->with('wp_insert_post_data', [$this->fixNonExistentAuthors, 'setArchiveAuthor'], 99, 2);
+					allow('wp_update_post')->toBeCalled();
+					expect('wp_update_post')->toBeCalled()->once();
+
+					$this->fixNonExistentAuthors->replaceAbsentAuthor();
+				});
+			});
+		});
+	});
+
+	describe('->setArchiveAuthor()', function () {
+		context('the post is not one of the types we want to fix', function () {
+			it('returns the post data unamended', function () {
+				$postData = [
+					'post_type' => 'custom_post_type',
+					'post_author' => 123
+				];
+				expect('get_network_option')->not->toBeCalled();
+
+				$result = $this->fixNonExistentAuthors->setArchiveAuthor($postData, []);
+
+				expect($result)->toEqual($postData);
+			});
+		});
+		context('the post is one of the type we want to fix', function () {
+			beforeEach(function () {
+				$this->postData = [
+					'post_type' => 'post',
+					'post_author' => 123
+				];
+			});
+			context('but the archive_author option is not set', function () {
+				it('returns the post data unamended', function () {
+					allow('get_network_option')->toBeCalled()->andReturn(false);
+
+					$result = $this->fixNonExistentAuthors->setArchiveAuthor($this->postData, []);
+
+					expect($result)->toEqual($this->postData);
+				});
+			});
+			context('and the archive_author option is an integer', function () {
+				it('amends the post data to set the post_author to the archive_author value', function () {
+					allow('get_network_option')->toBeCalled()->andReturn(456);
+					allow('taxonomy_exists')->toBeCalled()->andReturn(false);
+
+					$result = $this->fixNonExistentAuthors->setArchiveAuthor($this->postData, []);
+
+					expect($result)->toEqual([
+						'post_type' => 'post',
+						'post_author' => 456
+					]);
+				});
+			});
+			context('and the archive_author option is a string containing only an integer', function () {
+				it('amends the post data to set the post_author to the archive_author value', function () {
+					allow('get_network_option')->toBeCalled()->andReturn('456');
+					allow('taxonomy_exists')->toBeCalled()->andReturn(false);
+
+					$result = $this->fixNonExistentAuthors->setArchiveAuthor($this->postData, []);
+
+					expect($result)->toEqual([
+						'post_type' => 'post',
+						'post_author' => 456
+					]);
+				});
+			});
+			context('and the archive_author option is a string containing non-numeric characters', function () {
+				it('returns the post data unamended', function () {
+					allow('get_network_option')->toBeCalled()->andReturn('456foo');
+
+					$result = $this->fixNonExistentAuthors->setArchiveAuthor($this->postData, []);
+
+					expect($result)->toEqual($this->postData);
+				});
+			});
+			context('and the "author" taxonomy exists, indicating that co-authors is in use', function () {
+				it('removes any existing co-author relationships with this post, as well as amending the author ID', function () {
+					allow('get_network_option')->toBeCalled()->andReturn(456);
+					allow('taxonomy_exists')->toBeCalled()->andReturn(true);
+					allow('wp_delete_object_term_relationships')->toBeCalled();
+					expect('wp_delete_object_term_relationships')->toBeCalled()->once()->with(123, 'author');
+
+					$result = $this->fixNonExistentAuthors->setArchiveAuthor($this->postData, ['ID' => 123]);
+
+					expect($result)->toEqual([
+						'post_type' => 'post',
+						'post_author' => 456
+					]);
+				});
+			});
+		});
+	});
+});