Allow unblocking a blocked user. (#4018)

* Allow unblocking a blocked user.

* Warning unblocked user message.

config/services/user.yml

@@ -34,3 +34,8 @@ services:
     arguments: ['@database', '@entity_type.manager', '@date.formatter', '@console.drupal_api']
     tags:
       - { name: drupal.command }
+  console.user_unblock:
+    class: Drupal\Console\Command\User\UnblockCommand
+    arguments: ['@entity_type.manager']
+    tags:
+      - { name: drupal.command }

src/Command/User/UnblockCommand.php

@@ -0,0 +1,102 @@
+<?php
+/**
+ * @file
+ * Contains \Drupal\Console\Command\User\UnblockCommand.
+ */
+
+namespace Drupal\Console\Command\User;
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Output\OutputInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+
+class UnblockCommand extends UserBase
+{
+    /**
+     * UnblockCommand constructor.
+     *
+     * @param EntityTypeManagerInterface $entityTypeManager
+     */
+    public function __construct(
+        EntityTypeManagerInterface $entityTypeManager
+    ) {
+        parent::__construct($entityTypeManager);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('user:unblock')
+            ->setDescription($this->trans('commands.user.unblock.description'))
+            ->setHelp($this->trans('commands.user.unblock.help'))
+            ->addArgument(
+                'user',
+                InputArgument::REQUIRED,
+                $this->trans('commands.user.unblock.options.user')
+            )
+            ->setAliases(['uu']);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function interact(InputInterface $input, OutputInterface $output)
+    {
+        $this->getUserArgument();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $user = $input->getArgument('user');
+
+        $userEntity = $this->getUserEntity($user);
+
+        if (!$userEntity) {
+            $this->getIo()->error(
+                sprintf(
+                    $this->trans('commands.user.unblock.errors.invalid-user'),
+                    $user
+                )
+            );
+
+            return 1;
+        }
+
+        if (!$userEntity->isBlocked()) {
+          $this->getIo()->warning(
+            sprintf(
+              $this->trans('commands.user.unblock.warnings.unblocked-user'),
+              $user
+            )
+          );
+
+          return 1;
+        }
+
+        try {
+            $userEntity->activate();
+
+            $userEntity->save();
+
+            $this->getIo()->success(
+              sprintf(
+                $this->trans('commands.user.unblock.messages.unblock-successful'),
+                $user
+              )
+            );
+
+            return 0;
+        } catch (\Exception $e) {
+            $this->getIo()->error($e->getMessage());
+
+            return 1;
+        }
+    }
+}