Update: gitlab files moved to github

.craftplugin

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+{"pluginName":"Restrict Volumes","pluginDescription":"Decide what filetypes are allowed per volume.","pluginVersion":"1.0.0","pluginAuthorName":"Born05","pluginVendorName":"born05","pluginAuthorUrl":"https://born05.com","pluginAuthorGithub":"","codeComments":"","pluginComponents":["services","settings"],"consolecommandName":"","controllerName":"","cpsectionName":"","elementName":"","fieldName":"","modelName":"","purchasableName":"","recordName":"","serviceName":"test","taskName":"","utilityName":"","widgetName":"","apiVersion":"api_version_3_0"}

.gitignore

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+# CRAFT ENVIRONMENT
+.env.php
+.env.sh
+.env
+
+# COMPOSER
+/vendor
+
+# BUILD FILES
+/bower_components/*
+/node_modules/*
+/build/*
+/yarn-error.log
+
+# MISC FILES
+.cache
+.DS_Store
+.idea
+.project
+.settings
+*.esproj
+*.sublime-workspace
+*.sublime-project
+*.tmproj
+*.tmproject
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+config.codekit3
+prepros-6.config

CHANGELOG.md

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+# Craft volume filetypes Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/) and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## 1.0.0 - 2021-05-28
+### Added
+- Initial release
+## 1.0.2 - 2021-06-01
+### Fixed
+- Settings error after adding a new volume 

LICENSE.md

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+The MIT License (MIT)
+
+Copyright (c) 2021 Born05
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

composer.json

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+{
+    "name": "born05/restrict-volumes",
+    "description": "Decide what filetypes are allowed per volume.",
+    "type": "craft-plugin",
+    "version": "1.0.0",
+    "keywords": [
+        "craft",
+        "cms",
+        "craftcms",
+        "craft-plugin",
+        "restrict volumes"
+    ],
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Born05",
+            "homepage": "https://born05.com"
+        }
+    ],
+    "require": {
+        "craftcms/cms": "^3.0.0 || ^4.0.0"
+    },
+    "autoload": {
+        "psr-4": {
+          "born05\\restrictvolumes\\": "src/"
+        }
+    },
+    "extra": {
+        "name": "Restrict Volumes",
+        "handle": "restrict-volumes",
+        "developer": "Born05",
+        "developerUrl": "https://born05.com",
+        "class": "born05\\restrictvolumes\\Plugin"
+    }
+}

src/Plugin.php

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+<?php
+
+/**
+ * Craft restrict volumes plugin for Craft CMS 3.x
+ *
+ * Decide what filetypes are allowed per volume.
+ *
+ * @link      https://born05.com
+ * @copyright Copyright (c) 2021 Born05
+ */
+
+namespace born05\restrictvolumes;
+
+use born05\restrictvolumes\assetbundle\AssetBundle;
+use born05\restrictvolumes\models\Settings;
+
+use Craft;
+use craft\base\Model;
+use craft\elements\Asset;
+use craft\events\AssetEvent;
+use craft\helpers\Assets as AssetsHelper;
+use craft\i18n\PhpMessageSource;
+
+use yii\base\Event;
+
+/**
+ * Class Plugin
+ *
+ * @author    Born05
+ * @package   RestrictVolumes
+ * @since     1.0.0
+ */
+class Plugin extends \craft\base\Plugin
+{
+    // Static Properties
+    // =========================================================================
+
+    /**
+     * @var Plugin
+     */
+    public static $plugin;
+
+    // Public Properties
+    // =========================================================================
+
+    /**
+     * @inheritdoc
+     */
+    public string $schemaVersion = '1.0.0';
+
+    /**
+     * @var bool
+     */
+    public bool $hasCpSettings = true;
+
+    /**
+     * @var bool
+     */
+    public bool $hasCpSection = false;
+
+    // Public Methods
+    // =========================================================================
+
+    /**
+     * @inheritdoc
+     */
+    public function __construct($id, $parent = null, array $config = [])
+    {
+        Craft::setAlias('@born05/restrictvolumes', $this->getBasePath());
+
+        static::setInstance($this);
+
+        parent::__construct($id, $parent, $config);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function init()
+    {
+        parent::init();
+        self::$plugin = $this;
+
+        Craft::$app->i18n->translations['restrict-volumes'] = [
+            'class' => PhpMessageSource::class,
+            'sourceLanguage' => 'en',
+            'basePath' => __DIR__ . '/translations',
+            'allowOverrides' => true,
+        ];
+
+        if (Craft::$app->getRequest()->getIsCpRequest()) {
+            Craft::$app->getView()->registerAssetBundle(AssetBundle::class);
+        }
+
+        Event::on(
+            Asset::class,
+            Asset::EVENT_BEFORE_HANDLE_FILE,
+            function (AssetEvent $e) {
+                $asset = $e->asset;
+                $allowedKinds = $this->getSettings()->allowedKinds ?: [];
+
+                if (!$allowedKinds || count($allowedKinds) === 0) {
+                    return;
+                }
+
+                [$folderId] = AssetsHelper::parseFileLocation($asset->newLocation);
+                if (!$folderId) {
+                    return;
+                }
+
+                $targetVolume = Craft::$app->volumes->getVolumeById($folderId);
+                if (!$targetVolume) {
+                    return;
+                }
+
+                $targetVolumeHandle = $targetVolume->handle;
+                if (!array_key_exists($targetVolumeHandle, $allowedKinds)) {
+                    return;
+                }
+
+                $allowedVolumeFileKinds = $allowedKinds[$targetVolumeHandle];
+
+                $kind = $asset->kind;
+                if ($kind === null && $asset->filename !== null) {
+                    $kind = AssetsHelper::getFileKindByExtension($asset->filename);
+                } else if ($asset->kind === null) {
+                    return;
+                }
+
+                if (array_key_exists($kind, $allowedVolumeFileKinds) && !$allowedVolumeFileKinds[$kind]) {
+                    throw new \Exception(Craft::t('restrict-volumes', 'unallowed-error', ['kind' => $kind, 'volume' => $targetVolume->name]));
+                }
+            }
+        );
+    }
+
+    // Protected Methods
+    // =========================================================================
+
+    /**
+     * @inheritdoc
+     */
+    protected function createSettingsModel(): ?Model
+    {
+        return new Settings();
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function settingsHtml(): string
+    {
+        return Craft::$app->view->renderTemplate(
+            'restrict-volumes/settings',
+            [
+                'settings' => $this->getSettings()
+            ]
+        );
+    }
+}

src/assetbundle/AssetBundle.php

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+<?php
+
+/**
+ * Craft restrict volumes plugin for Craft CMS 3.x
+ *
+ * Decide what filetypes are allowed per volume.
+ *
+ * @link      https://born05.com
+ * @copyright Copyright (c) 2021 Born05
+ */
+
+namespace born05\restrictvolumes\assetbundle;
+
+use craft\web\assets\cp\CpAsset;
+
+/**
+ * @author    Born05
+ * @package   RestrictVolumes
+ * @since     1.0.0
+ */
+class AssetBundle extends \craft\web\AssetBundle
+{
+    /**
+     * @inheritdoc
+     */
+    public $sourcePath = __DIR__ . '/dist';
+
+    /**
+     * @inheritdoc
+     */
+    public $depends = [CpAsset::class];
+
+    /**
+     * @inheritdoc
+     */
+    public $css = ['css/restrict-volumes.css'];
+}

src/assetbundle/dist/css/restrict-volumes.css

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+/**
+ * Craft volume filetypes plugin for Craft CMS
+ *
+ * Craft volume filetypes CSS
+ *
+ * @author    Born05
+ * @copyright Copyright (c) 2021 Born05
+ * @link      https://born05.com
+ * @package   RestrictVolumes
+ * @since     1.0.0
+ */
+
+.allowed-kinds .checkboxfield {
+    margin: 0;
+}
+
+.allowed-kinds {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, 230px);
+    grid-gap: 35px;
+}
+
+.allowed-kinds-volume {
+    padding: 22px 30px;
+    background-color: var(--gray-100);
+    border-radius: 5px;
+}

src/models/Settings.php

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+<?php
+
+/**
+ * Craft restrict volumes plugin for Craft CMS 3.x
+ *
+ * Decide what filetypes are allowed per volume.
+ *
+ * @link      https://born05.com
+ * @copyright Copyright (c) 2021 Born05
+ */
+
+namespace born05\restrictvolumes\models;
+
+/**
+ * @author    Born05
+ * @package   RestrictVolumes
+ * @since     1.0.0
+ */
+class Settings extends \craft\base\Model
+{
+    // Public Properties
+    // =========================================================================
+
+    /**
+     * @var string
+     */
+    public $allowedKinds = [];
+
+    // Public Methods
+    // =========================================================================
+
+    /**
+     * @inheritdoc
+     */
+    public function rules(): array
+    {
+        return [
+            ['allowedKinds', 'default', 'value' => []],
+        ];
+    }
+}