Add php-cs-fixer as tool to project

Squashed commits
----------------
* fb76eba 2022-06-13 Zombaya  Add php-cs-fixer as tool to project.
                                Installed according to best practice in README of php-cs-fixer.
* 549ceae 2022-06-14 Zombaya  Add pipeline-check for valid codestyle using php-cs-fixer
* 11812f2 2022-09-13 Zombaya  Update CONTRIBUTING.md and set version of php-cs-fixer fixed to current latest version
* 01cb480 2022-09-13 Zombaya  Autoformat src and tests to PSR-12 using php-cs-fixer
* e5e6e9599 2022-09-13 Zombaya  Add release-file

.changes/nextrelease/php-cs-fixer

@@ -0,0 +1,7 @@
+[
+    {
+        "type": "enhancement",
+        "category": "",
+        "description": "Add php-cs-fixer as tool to format code and lint code according to PSR-12 during github actions"
+    }
+]

.gitattributes

@@ -1,6 +1,7 @@
 build/ export-ignore
 docs/ export-ignore
 tests/ export-ignore
+tools/ export-ignore
 features/ export-ignore
 vendor/ export-ignore
 .gitattributes export-ignore
@@ -13,6 +14,7 @@ composer.lock export-ignore
 CONTRIBUTING.md export-ignore
 Makefile export-ignore
 phpunit.xml.dist export-ignore
+.php-cs-fixer.dist.php export-ignore
 README.md export-ignore
 UPGRADING.md export-ignore
 src/data/*.json export-ignore

.github/workflows/tests.yml

@@ -87,3 +87,36 @@ jobs:
     - if: ${{ (matrix.php-versions == '7.1' || matrix.php-versions == '8.0') && matrix.composer-options == '' }}
       name: Code coverage
       run: bash <(curl -s https://codecov.io/bash)
+
+  lint:
+    runs-on: ubuntu-20.04
+    name: Lint
+    steps:
+      #sets up the correct version of PHP with necessary config options
+      - name: Setup PHP with Xdebug
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.1
+          ini-values: xdebug.overload_var_dump=0, memory_limit=4G, phar.readonly=false
+
+      #checkout the codebase from github
+      - name: Checkout codebase
+        uses: actions/checkout@v2
+
+      #get dependencies
+      - name: Install dependencies
+        run: composer update --working-dir=tools/php-cs-fixer --no-interaction
+
+      #run tests
+      - name: Lint codestyle using php-cs-fixer
+        run: >
+          tools/php-cs-fixer/vendor/bin/php-cs-fixer fix --verbose --dry-run || \
+              ( echo -e "\n\n" \
+                  && echo "Problems with the formatting of the code have been detected." \
+                  && echo "You can manually fix these problems or run following commands to automatically fix these problems:" \
+                  && echo -e "\n" \
+                  && echo "composer install --working-dir=tools/php-cs-fixer" \
+                  && echo "tools/php-cs-fixer/vendor/bin/php-cs-fixer fix -v" \
+                  && echo -e "\n\n" \
+                  && $(exit 1) # fail test \
+                )

.gitignore

@@ -9,12 +9,13 @@ test_services.json
 .idea
 .php_cs.cache
 .phpunit.result.cache
+.php-cs-fixer.cache
 atlassian-ide-plugin.xml
 aws-sdk-php.iml
 .DS_Store
 .swp
 .build
-composer.lock
+/composer.lock
 vendor
 docs/_build
 docs/venv

.php-cs-fixer.dist.php

@@ -0,0 +1,29 @@
+<?php
+
+$finder = PhpCsFixer\Finder::create()
+    ->in([
+        __DIR__ . '/src',
+        __DIR__ . '/tests',
+    ])
+    ->exclude([
+        'data'
+    ])
+;
+
+return (new PhpCsFixer\Config())
+    ->setRules([
+        '@PER' => true,
+
+        // By default, visibility is required by PSR-12 for property, method and const.
+        // PHP >= 7.1 is required for const.
+        // Since we support PHP >= 5.5, the required visibility for const's is disabled.
+        // See https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/master/doc/rules/class_notation/visibility_required.rst
+        'visibility_required' => [
+            'elements' => [
+                'property',
+                'method',
+            ],
+        ]
+    ])
+    ->setFinder($finder)
+;

CONTRIBUTING.md

@@ -85,8 +85,12 @@ we ask the same of all community contributions as well:
    will be released under that license. For substantial contributions, we may
    ask you to sign a [Contributor License Agreement (CLA)][cla].
 2. We follow all of the relevant PSR recommendations from the [PHP Framework
-   Interop Group][php-fig]. Please submit code that follows these standards.
-   The [PHP CS Fixer][cs-fixer] tool can be helpful for formatting your code.
+   Interop Group][php-fig]. Please submit code that follows the 
+   [PSR-12 standard](php-fig-psr12).  
+   The [PHP CS Fixer][cs-fixer] tool can be helpful for formatting your code.  
+   You can install the currently used version of PHP CS Fixer using 
+   `composer install-cs-fix` and automatically format
+   your code by running `composer cs-fix`.
 3. We maintain a high percentage of code coverage in our unit tests. If you make
    changes to the code, please add, update, and/or remove tests as appropriate.
    Tests are run via `make test` command.
@@ -152,7 +156,8 @@ category field should exist with the value set to an empty string `""`.
 [pull-requests]: https://github.com/aws/aws-sdk-php/pulls
 [license]: http://aws.amazon.com/apache2.0/
 [cla]: https://github.com/aws/aws-cla/blob/master/amazon-single-contribution-license.txt
-[php-fig]: http://php-fig.org
+[php-fig]: https://www.php-fig.org/
+[php-fig-psr12]: https://www.php-fig.org/psr/psr-12/
 [cs-fixer]: http://cs.sensiolabs.org/
 [phpstan]: https://github.com/phpstan/phpstan
 [sphinx]: http://sphinx-doc.org/

composer.json

@@ -45,6 +45,10 @@
         "yoast/phpunit-polyfills": "^1.0",
         "dms/phpunit-arraysubset-asserts": "^0.4.0"
     },
+    "scripts": {
+        "install-cs-fix": "@composer install --working-dir=tools/php-cs-fixer",
+        "cs-fix": "tools/php-cs-fixer/vendor/bin/php-cs-fixer fix -v"
+    },
     "suggest": {
         "ext-openssl": "Allows working with CloudFront private distributions and verifying received SNS messages",
         "ext-curl": "To send requests using cURL",

tools/php-cs-fixer/.gitignore

@@ -0,0 +1 @@
+.php-cs-fixer.cache

tools/php-cs-fixer/composer.json

@@ -0,0 +1,5 @@
+{
+    "require": {
+        "friendsofphp/php-cs-fixer": "^3.11.0"
+    }
+}