first commit

Observer/DisableFrontend.php

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+<?php
+namespace Abelbm\DisableFrontend\Observer;
+use Magento\Framework\Event\ObserverInterface;
+
+class DisableFrontend implements ObserverInterface{
+
+    protected   $_actionFlag;
+    protected   $redirect;
+    private     $HelperBackend;
+    private     $logger;
+
+    /**
+     * 
+     * @author Abel Bolanos Martinez <[email protected]> 
+     * @param \Magento\Framework\App\ActionFlag $actionFlag
+     * @param \Magento\Framework\Message\ManagerInterface $messageManager
+     * @param \Magento\Framework\App\Response\RedirectInterface $redirect
+     * @param \Magento\Backend\Helper\Data $HelperBackend
+     * @param \Psr\Log\LoggerInterface $logger
+     */
+    public function __construct(
+        \Magento\Framework\App\ActionFlag $actionFlag,
+        \Magento\Framework\App\Response\RedirectInterface $redirect,
+        \Magento\Backend\Helper\Data $HelperBackend,
+        \Psr\Log\LoggerInterface $logger
+    ) {
+        $this->_actionFlag = $actionFlag;
+        $this->redirect = $redirect;
+        $this->HelperBackend = $HelperBackend;
+        $this->logger = $logger;
+    }
+
+    /**
+     *
+     * @author Abel Bolanos Martinez <[email protected]>
+     * @param \Magento\Framework\Event\Observer $observer
+     * @return void
+     */
+    public function execute(\Magento\Framework\Event\Observer $observer){
+
+        //$this->logger->info('TEST LOGGER');
+
+        $this->_actionFlag->set('', \Magento\Framework\App\Action\Action::FLAG_NO_DISPATCH, true);
+
+        //custom redirect
+        //$controller = $observer->getControllerAction();
+        //$this->redirect->redirect($controller->getResponse(),$this->HelperBackend->getHomePageUrl());
+    }
+}

README.md

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+## Disable Frontend
+Magento 2 
+
+#### 1 - Installation Disable Frontend
+
+##### Manual Installation
+
+Install Disable Frontend for Magento2
+ * Download the extension
+ * Unzip the file
+ * Create a folder {Magento root}/app/code/Abelbm/DisableFrontend
+ * Copy the content from the unzip folder
+
+
+##### Using Composer
+
+```
+composer require abelbm/disablefrontend:dev-master
+```
+
+#### 2 - Enable Disable Frontend
+
+ * php bin/magento module:enable Abelbm_DisableFrontend
+ * php bin/magento setup:upgrade
+ * php bin/magento cache:flush
+ * php bin/magento setup:di:compile

composer.json

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+{
+    "name": "abelbm/disablefrontend",
+    "description": "Disable Frontend",
+    "keywords": [
+        "magento 2",
+        "Disable",
+        "Frontend",
+        "Disable Frontend Magento 2"
+    ],
+    "require": {
+        "php": "~5.5.0|~5.6.0|~7.0.0"
+    },
+    "type": "magento2-module",
+    "version": "1.0.0",
+    "license": [
+        "AGPL-3.0"
+    ],
+    "author": [
+        {
+            "name": "Abel Bolanos Martinez",
+            "email": "[email protected]",
+            "homepage": "http://abelbolanos.blogspot.com/",
+            "role": "Developer"
+        }
+    ],
+    "autoload": {
+        "files": [
+            "registration.php"
+        ],
+        "psr-4": {
+            "Abelbm\\DisableFrontend\\": ""
+        }
+    }
+}

etc/frontend/events.xml

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+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
+    <event name="controller_action_predispatch">
+        <observer name="disable_frontend_observer" instance="Abelbm\DisableFrontend\Observer\DisableFrontend"/>
+    </event>
+</config>

etc/module.xml

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+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
+    <module name="Abelbm_DisableFrontend" setup_version="1.0.0">
+        <sequence>
+            <module name="Magento_Store"/>
+        </sequence>
+    </module>
+</config>

registration.php

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+<?php
+
+\Magento\Framework\Component\ComponentRegistrar::register(
+    \Magento\Framework\Component\ComponentRegistrar::MODULE,
+    'Abelbm_DisableFrontend',
+    __DIR__
+);