From 84e915830d09b95ff1cdee3b54fcdd90c480e89d Mon Sep 17 00:00:00 2001
From: Steve Boyd <emteknetnz@gmail.com>
Date: Mon, 15 Apr 2024 15:31:18 +1200
Subject: [PATCH] NEW Create GraphQLSchemaInitTask

Co-authored-by: Aaron Carlino <unclecheese@leftandmain.com>
---
 README.md                     |  23 +++
 src/GraphQLSchemaInitTask.php | 278 ++++++++++++++++++++++++++++++++++
 2 files changed, 301 insertions(+)
 create mode 100644 src/GraphQLSchemaInitTask.php

diff --git a/README.md b/README.md
index 3e5f256..b0712af 100644
--- a/README.md
+++ b/README.md
@@ -88,6 +88,29 @@ SilverStripe\Control\Director:
       Schema: default
 ```
 
+## GraphQL schema initialise task
+
+This module provides a `GraphQLSchemaInitTask` task to initialise a basic GraphQL schema to get you started. It will create configuration files for your schema and a basic resolver. Specifically it will create:
+
+- `app/_config/graphql.yml`
+- `app/_graphql` containing several yml files
+- `src/GraphQL/Resolvers.php`
+
+You must be in CLI mode to use this task
+
+To view help for the task to see what options are available:
+
+```bash
+vendor/bin/sake dev/tasks/GraphQLSchemaInitTask help=1
+```
+
+To run the task with with minimal options:
+
+```bash
+vendor/bin/sake dev/tasks/GraphQLSchemaInitTask namespace=App
+```
+
+
 ## Upgrading and maintaining the IDE
  
  The library running the IDE is [GraphQL Playground](https://github.com/graphql/graphql-playground).
diff --git a/src/GraphQLSchemaInitTask.php b/src/GraphQLSchemaInitTask.php
new file mode 100644
index 0000000..c074586
--- /dev/null
+++ b/src/GraphQLSchemaInitTask.php
@@ -0,0 +1,278 @@
+<?php
+
+namespace SilverStripe\GraphQLDevTools;
+
+use SilverStripe\Control\Director;
+use SilverStripe\Control\HTTPRequest;
+use SilverStripe\Core\Manifest\ModuleManifest;
+use SilverStripe\Core\Path;
+use SilverStripe\Dev\BuildTask;
+use SilverStripe\GraphQL\Config\Configuration;
+
+/**
+ * A task that initialises a GraphQL 4+ schema with boilerplate config and files.
+ */
+class GraphQLSchemaInitTask extends BuildTask
+{
+    private static $segment = 'GraphQLSchemaInitTask';
+
+    protected $enabled = true;
+
+    protected $title = 'Initialise a new GraphQL schema';
+
+    protected $description = 'Boilerplate setup for a new GraphQL schema';
+
+    private string $appNamespace;
+
+    private string $schemaName = 'default';
+
+    private string $graphqlConfigDir = '_graphql';
+
+    private string $graphqlCodeDir = 'GraphQL';
+
+    private string $endpoint = 'graphql';
+
+    private string $projectDir = '';
+
+    private string $srcDir = 'src';
+
+    private string $perms = '';
+
+    /**
+     * @param HTTPRequest $request
+     */
+    public function run($request)
+    {
+        if (!Director::is_cli()) {
+            echo "This task can only be run from CLI\n";
+            return;
+        }
+
+        if (!class_exists(Configuration::class)) {
+            echo "This task requires GraphQL v4+ to be installed\n";
+            return;
+        }
+
+        if ($request->getVar('help')) {
+            $this->showHelp();
+            return;
+        }
+
+        $appNamespace = $request->getVar('namespace');
+
+        if (!$appNamespace) {
+            $segment = static::$segment;
+            echo "Please provide a base namespace for your app, e.g. \"namespace=App\" or \"namespace=MyVendor\MyProject\".\nFor help, run \"dev/tasks/$segment help=1\"\n";
+            return;
+        }
+
+        $this->appNamespace = $appNamespace;
+
+        $this->projectDir = ModuleManifest::config()->get('project');
+
+        $schemaName = $request->getVar('name');
+        if ($schemaName) {
+            $this->schemaName = $schemaName;
+        }
+
+        $graphqlConfigDir = $request->getVar('graphqlConfigDir');
+        if ($graphqlConfigDir) {
+            $this->graphqlConfigDir = $graphqlConfigDir;
+        }
+
+        $graphqlCodeDir = $request->getVar('graphqlCodeDir');
+        if ($graphqlCodeDir) {
+            $this->graphqlCodeDir = $graphqlCodeDir;
+        }
+
+        $endpoint = $request->getVar('endpoint');
+        if ($endpoint) {
+            $this->endpoint = $endpoint;
+        }
+
+        $srcDir = $request->getVar('srcDir');
+        if ($srcDir) {
+            $this->srcDir = $srcDir;
+        }
+
+        $absProjectDir = Path::join(BASE_PATH, $this->projectDir);
+        $this->perms = fileperms($absProjectDir);
+
+        $this->createGraphQLConfig();
+        $this->createProjectConfig();
+        $this->createResolvers();
+    }
+
+    /**
+     * Creates the SS config in _config/graphql.yml
+     */
+    private function createProjectConfig(): void
+    {
+        $absConfigFile = Path::join(BASE_PATH, $this->projectDir, '_config', 'graphql.yml');
+        if (file_exists($absConfigFile)) {
+            echo "Config file $absConfigFile already exists. Skipping." . PHP_EOL;
+            return;
+        }
+
+        $rulesArr = [
+            "    $this->endpoint: '%\$SilverStripe\GraphQL\Controller.$this->schemaName'"
+        ];
+        // A default schema is required, even though it's empty
+        if ($this->schemaName !== 'default') {
+            $rulesArr[] = "    default: '%\$SilverStripe\GraphQL\Controller.default'";
+        }
+        $rules = implode("\n", $rulesArr);
+
+        $extra = '';
+        if ($this->schemaName !== 'default') {
+            $extra = <<<YAML
+            SilverStripe\Core\Injector\Injector:
+              SilverStripe\GraphQL\Controller.$this->schemaName:
+                class: SilverStripe\GraphQL\Controller
+                constructor:
+                  schemaKey: $this->schemaName
+            YAML;
+        }
+
+        $defaultProjectConfig = <<<YAML
+        SilverStripe\Control\Director:
+          rules:
+        $rules
+        
+        SilverStripe\GraphQL\Schema\Schema:
+          schemas:
+            $this->schemaName:
+              src:
+                - $this->projectDir/$this->graphqlConfigDir
+
+        $extra
+        YAML;
+        $defaultProjectConfig = trim($defaultProjectConfig) . "\n";
+        file_put_contents($absConfigFile, $defaultProjectConfig);
+    }
+
+    /**
+     * Creates the graphql schema specific config in _graphql/
+     */
+    private function createGraphQLConfig(): void
+    {
+        $absGraphQLDir = Path::join(BASE_PATH, $this->projectDir, $this->graphqlConfigDir);
+        if (is_dir($absGraphQLDir)) {
+            echo "GraphQL config directory already exists. Skipping." . PHP_EOL;
+            return;
+        }
+
+        echo "Creating graphql config directory: $this->graphqlConfigDir" . PHP_EOL;
+        mkdir($absGraphQLDir, $this->perms);
+        foreach (['models', 'config', 'types', 'queries', 'mutations'] as $file) {
+            touch(Path::join($absGraphQLDir, "$file.yml"));
+        }
+
+        // config.yml
+        $configPath = Path::join($absGraphQLDir, 'config.yml');
+        $defaultConfig = <<<YAML
+        resolvers:
+          - $this->appNamespace\\$this->graphqlCodeDir\\Resolvers
+        YAML;
+        file_put_contents($configPath, $defaultConfig);
+
+        // models.yml
+        $configPath = Path::join($absGraphQLDir, 'models.yml');
+        $defaultConfig = <<<YAML
+        # This is just an example to get you started. You should change this.
+        Page:
+          fields: '*'
+          operations: '*'
+        YAML;
+        file_put_contents($configPath, $defaultConfig);
+    }
+
+    /**
+     * Creates an example resolvers class for autodiscovery in app/src/GraphQL/Resolvers.php
+     */
+    private function createResolvers(): void
+    {
+        $absSrcDir = Path::join(BASE_PATH, $this->projectDir, $this->srcDir);
+        $absGraphQLCodeDir = Path::join($absSrcDir, $this->graphqlCodeDir);
+        $graphqlNamespace = implode('\\', [
+            $this->appNamespace,
+            str_replace('/', '\\', $this->graphqlCodeDir)
+        ]);
+        if (is_dir($absGraphQLCodeDir)) {
+            echo "GraphQL code dir $this->graphqlCodeDir already exists. Skipping" . PHP_EOL;
+            return;
+        }
+
+        echo "Creating resolvers class in $graphqlNamespace" . PHP_EOL;
+        mkdir($absGraphQLCodeDir, $this->perms, true);
+        $resolverFile = Path::join($absGraphQLCodeDir, 'Resolvers.php');
+        $moreInfo = 'https://docs.silverstripe.org/en/developer_guides/graphql/'
+            . 'working_with_generic_types/resolver_discovery/#the-resolver-discovery-pattern';
+        $resolverCode = <<<PHP
+        <?php
+
+        namespace $graphqlNamespace;
+
+        /**
+         * Use this class to define custom resolvers. Static functions in this class
+         * matching the pattern resolve<FieldName> or resolve<TypeNameFieldName>
+         * will be automatically assigned to their respective fields.
+         *
+         * More information: $moreInfo
+         */
+        class Resolvers
+        {
+            public static function resolveMyQuery(\$obj, array \$args, array \$context): array
+            {
+                // Return the result of query { myQuery { ... } }
+                return [
+                    'lorem' => 'ipsum'
+                ];
+            }
+        }
+
+        PHP;
+        file_put_contents($resolverFile, $resolverCode);
+    }
+
+    /**
+     * Outputs help text to the console
+     */
+    private function showHelp(): void
+    {
+        $segment = static::$segment;
+        echo <<<TXT
+
+        ****
+        This task executes a lot of the boilerplate required to build a new GraphQL schema. It will
+        generate a few files in your project directory. Any files that already exist will not be
+        overwritten. The task can be run multiple times and is non-destructive.
+        ****
+
+        -- Example:
+
+        $ vendor/bin/sake dev/tasks/$segment namespace="MyAgency\MyApp"
+
+        -- Arguments:
+
+        namespace
+        The root namespace. Required.
+
+        name
+        The name of the schema. Default: "default" (optional)
+
+        graphqlConfigDir
+        The folder where the flushless graphql config files will go. Default: "_graphql" (optional)
+
+        graphqlCodeDir
+        The subfolder of src/ where your GraphQL code (the resolver class) will go. Follows PSR-4 based on the namespace argument. Default: "GraphQL". (optional)
+
+        endpoint
+        The endpoint to use for the schema. Default: "graphql" (optional)
+
+        srcDir
+        The subfolder of the project directory where the src code lives. Default: "src" (optional)
+
+        TXT;
+    }
+}