From 3b8b6d3732956f3b4bcd6ca3b8268039293749ee Mon Sep 17 00:00:00 2001
From: Alexey Skobkin <x@skobkin.ru>
Date: Thu, 5 Jan 2017 23:17:19 +0300
Subject: [PATCH] Telegram account linking added. Telegram bot services
 refactored. Legacy abstract API client POST requests fixed.

---
 .../Version20170105191821.php                 |  38 +++
 .../Controller/Telegram/WebHookController.php |  21 +-
 .../Bundle/PointToolsBundle/DTO/Api/Auth.php  |  96 ++++++
 .../Entity/Telegram/Account.php               | 264 +++++++++++++++
 .../Telegram/CommandProcessingException.php   |   9 +
 .../SubscriptionEventRepository.php           |  27 +-
 .../Resources/config/services.yml             |  57 +++-
 .../Resources/views/Telegram/error.md.twig    |   7 +
 .../Resources/views/Telegram/help.md.twig     |   3 +
 .../Telegram/last_user_subscriptions.md.twig  |  12 +
 .../views/Telegram/user_subscribers.md.twig   |  11 +
 .../Resources/views/User/show.html.twig       |   4 +-
 .../PointToolsBundle/Service/AbstractApi.php  |   4 +-
 .../Factory/Telegram/AccountFactory.php       |  46 +++
 .../Telegram/IncomingUpdateDispatcher.php     |  53 +++
 .../Telegram/IncomingUpdateProcessor.php      | 170 ----------
 .../Service/Telegram/InlineQueryProcessor.php |  68 ++++
 .../Telegram/PrivateMessageProcessor.php      | 307 ++++++++++++++++++
 .../PointToolsBundle/Service/UserApi.php      |  61 +++-
 19 files changed, 1065 insertions(+), 193 deletions(-)
 create mode 100644 app/DoctrineMigrations/Version20170105191821.php
 create mode 100644 src/Skobkin/Bundle/PointToolsBundle/DTO/Api/Auth.php
 create mode 100644 src/Skobkin/Bundle/PointToolsBundle/Entity/Telegram/Account.php
 create mode 100644 src/Skobkin/Bundle/PointToolsBundle/Exception/Telegram/CommandProcessingException.php
 create mode 100644 src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/error.md.twig
 create mode 100644 src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/last_user_subscriptions.md.twig
 create mode 100644 src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/user_subscribers.md.twig
 create mode 100644 src/Skobkin/Bundle/PointToolsBundle/Service/Factory/Telegram/AccountFactory.php
 create mode 100644 src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/IncomingUpdateDispatcher.php
 delete mode 100644 src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/IncomingUpdateProcessor.php
 create mode 100644 src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/InlineQueryProcessor.php
 create mode 100644 src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/PrivateMessageProcessor.php

diff --git a/app/DoctrineMigrations/Version20170105191821.php b/app/DoctrineMigrations/Version20170105191821.php
new file mode 100644
index 0000000..5eb5559
--- /dev/null
+++ b/app/DoctrineMigrations/Version20170105191821.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Application\Migrations;
+
+use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\DBAL\Schema\Schema;
+
+/**
+ * Telegram accounts added
+ */
+class Version20170105191821 extends AbstractMigration
+{
+    /**
+     * @param Schema $schema
+     */
+    public function up(Schema $schema)
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->abortIf($this->connection->getDatabasePlatform()->getName() != 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
+
+        $this->addSql('CREATE TABLE users.telegram_accounts (account_id INT NOT NULL, user_id INT DEFAULT NULL, created_at TIMESTAMP(0) WITHOUT TIME ZONE NOT NULL, updated_at TIMESTAMP(0) WITHOUT TIME ZONE DEFAULT NULL, linked_at TIMESTAMP(0) WITHOUT TIME ZONE DEFAULT NULL, first_name TEXT NOT NULL, last_name TEXT DEFAULT NULL, username TEXT DEFAULT NULL, private_chat_id BIGINT DEFAULT NULL, subscriber_notification BOOLEAN NOT NULL, rename_notification BOOLEAN NOT NULL, PRIMARY KEY(account_id))');
+        $this->addSql('CREATE UNIQUE INDEX UNIQ_1EDB9B25A76ED395 ON users.telegram_accounts (user_id)');
+        $this->addSql('CREATE INDEX subscriber_notification_idx ON users.telegram_accounts (subscriber_notification) WHERE subscriber_notification = TRUE');
+        $this->addSql('CREATE INDEX rename_notification_idx ON users.telegram_accounts (rename_notification) WHERE rename_notification = TRUE');
+        $this->addSql('ALTER TABLE users.telegram_accounts ADD CONSTRAINT FK_1EDB9B25A76ED395 FOREIGN KEY (user_id) REFERENCES users.users (id) ON DELETE CASCADE NOT DEFERRABLE INITIALLY IMMEDIATE');
+    }
+
+    /**
+     * @param Schema $schema
+     */
+    public function down(Schema $schema)
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->abortIf($this->connection->getDatabasePlatform()->getName() != 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
+
+        $this->addSql('DROP TABLE users.telegram_accounts');
+    }
+}
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Controller/Telegram/WebHookController.php b/src/Skobkin/Bundle/PointToolsBundle/Controller/Telegram/WebHookController.php
index 666ac6e..8bd13e9 100644
--- a/src/Skobkin/Bundle/PointToolsBundle/Controller/Telegram/WebHookController.php
+++ b/src/Skobkin/Bundle/PointToolsBundle/Controller/Telegram/WebHookController.php
@@ -18,14 +18,31 @@ class WebHookController extends Controller
             throw $this->createNotFoundException();
         }
 
+        $logger = $this->get('logger');
+
         $content = json_decode($request->getContent(), true);
 
         $update = new Update(
             $content,
-            $this->get('logger')
+            $logger
         );
 
-        $this->get('point_tools.telegram.update_processor')->process($update);
+        try {
+            $this->get('point_tools.telegram.update_dispatcher')->process($update);
+        } catch (\Exception $e) {
+            if ($this->getParameter('kernel.debug')) {
+                throw $e;
+            }
+
+            $logger->addError('Telegram bot error', [
+                'exception' => get_class($e),
+                'file' => $e->getFile(),
+                'line' => $e->getLine(),
+                'code' => $e->getCode(),
+                'message' => $e->getMessage(),
+                'trace' => $e->getTraceAsString(),
+            ]);
+        }
 
         return new JsonResponse('received');
     }
diff --git a/src/Skobkin/Bundle/PointToolsBundle/DTO/Api/Auth.php b/src/Skobkin/Bundle/PointToolsBundle/DTO/Api/Auth.php
new file mode 100644
index 0000000..51bf3e6
--- /dev/null
+++ b/src/Skobkin/Bundle/PointToolsBundle/DTO/Api/Auth.php
@@ -0,0 +1,96 @@
+<?php
+
+namespace Skobkin\Bundle\PointToolsBundle\DTO\Api;
+
+use JMS\Serializer\Annotation as JMSS;
+
+/**
+ * @JMSS\ExclusionPolicy("none")
+ * @JMSS\AccessType("public_method")
+ */
+class Auth
+{
+    /**
+     * @var string
+     *
+     * @JMSS\SerializedName("token")
+     * @JMSS\Type("string")
+     */
+    private $token;
+
+    /**
+     * @var string
+     *
+     * @JMSS\SerializedName("csrf_token")
+     * @JMSS\Type("string")
+     */
+    private $csRfToken;
+
+    /**
+     * @var string
+     *
+     * @JMSS\SerializedName("error")
+     * @JMSS\Type("string")
+     */
+    private $error;
+
+    /**
+     * @return string|null
+     */
+    public function getToken()
+    {
+        return $this->token;
+    }
+
+    /**
+     * @param string|null $token
+     *
+     * @return Auth
+     */
+    public function setToken(string $token = null): Auth
+    {
+        $this->token = $token;
+
+        return $this;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getCsRfToken()
+    {
+        return $this->csRfToken;
+    }
+
+    /**
+     * @param string $csRfToken
+     *
+     * @return Auth
+     */
+    public function setCsRfToken(string $csRfToken = null)
+    {
+        $this->csRfToken = $csRfToken;
+
+        return $this;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getError()
+    {
+        return $this->error;
+    }
+
+    /**
+     * @param string|null $error
+     *
+     * @return Auth
+     */
+    public function setError(string $error = null): Auth
+    {
+        $this->error = $error;
+
+        return $this;
+    }
+}
\ No newline at end of file
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Entity/Telegram/Account.php b/src/Skobkin/Bundle/PointToolsBundle/Entity/Telegram/Account.php
new file mode 100644
index 0000000..20d4b48
--- /dev/null
+++ b/src/Skobkin/Bundle/PointToolsBundle/Entity/Telegram/Account.php
@@ -0,0 +1,264 @@
+<?php
+
+namespace Skobkin\Bundle\PointToolsBundle\Entity\Telegram;
+
+use Doctrine\ORM\Mapping as ORM;
+use Skobkin\Bundle\PointToolsBundle\Entity\User;
+
+/**
+ * Account
+ *
+ * @ORM\Table(name="telegram_accounts", schema="users", indexes={
+ *      @ORM\Index(name="subscriber_notification_idx", columns={"subscriber_notification"}, options={"where": "subscriber_notification = TRUE"}),
+ *      @ORM\Index(name="rename_notification_idx", columns={"rename_notification"}, options={"where": "rename_notification = TRUE"}),
+ * })
+ * @ORM\Entity
+ * @ORM\HasLifecycleCallbacks()
+ */
+class Account
+{
+    /**
+     * Telegram user ID
+     *
+     * @var int
+     *
+     * @ORM\Id()
+     * @ORM\Column(name="account_id", type="integer")
+     */
+    private $id;
+
+    /**
+     * @var \DateTime
+     *
+     * @ORM\Column(name="created_at", type="datetime")
+     */
+    private $createdAt;
+
+    /**
+     * @var \DateTime
+     *
+     * @ORM\Column(name="updated_at", type="datetime", nullable=true)
+     */
+    private $updatedAt;
+
+    /**
+     * @var \DateTime
+     *
+     * @ORM\Column(name="linked_at", type="datetime", nullable=true)
+     */
+    private $linkedAt;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(name="first_name", type="text")
+     */
+    private $firstName;
+
+    /**
+     * @var string|null
+     *
+     * @ORM\Column(name="last_name", type="text", nullable=true)
+     */
+    private $lastName;
+
+    /**
+     * @var string|null
+     *
+     * @ORM\Column(name="username", type="text", nullable=true)
+     */
+    private $username;
+
+    /**
+     * ID of private chat with user
+     *
+     * @var int
+     *
+     * @ORM\Column(name="private_chat_id", type="bigint", nullable=true)
+     */
+    private $chatId;
+
+    /**
+     * @var User
+     *
+     * @ORM\OneToOne(targetEntity="Skobkin\Bundle\PointToolsBundle\Entity\User")
+     * @ORM\JoinColumn(name="user_id", nullable=true, onDelete="CASCADE")
+     */
+    private $user;
+
+    /**
+     * Notifications about new subscribers
+     *
+     * @var bool
+     *
+     * @ORM\Column(name="subscriber_notification", type="boolean")
+     */
+    private $subscriberNotification = false;
+
+    /**
+     * Notifications about user renaming
+     *
+     * @var bool
+     *
+     * @ORM\Column(name="rename_notification", type="boolean")
+     */
+    private $renameNotification = false;
+
+
+    public function __construct(int $id)
+    {
+        $this->id = $id;
+    }
+
+    /**
+     * @ORM\PrePersist()
+     */
+    public function prePersist()
+    {
+        $this->createdAt = new \DateTime();
+    }
+
+    /**
+     * @ORM\PreUpdate()
+     */
+    public function preUpdate()
+    {
+        $this->updatedAt = new \DateTime();
+    }
+
+    public function getId(): int
+    {
+        return $this->id;
+    }
+
+    /**
+     * @return \DateTime
+     */
+    public function getCreatedAt(): \DateTime
+    {
+        return $this->createdAt;
+    }
+
+    /**
+     * @return \DateTime
+     */
+    public function getUpdatedAt(): \DateTime
+    {
+        return $this->updatedAt;
+    }
+
+    /**
+     * @return \DateTime
+     */
+    public function getLinkedAt(): \DateTime
+    {
+        return $this->linkedAt;
+    }
+
+    public function getFirstName(): string
+    {
+        return $this->firstName;
+    }
+
+    public function setFirstName(string $firstName): Account
+    {
+        $this->firstName = $firstName;
+
+        return $this;
+    }
+
+    public function getLastName(): string
+    {
+        return $this->lastName;
+    }
+
+    public function setLastName(string $lastName = null): Account
+    {
+        $this->lastName = $lastName;
+
+        return $this;
+    }
+
+    public function getUsername(): string
+    {
+        return $this->username;
+    }
+
+    public function setUsername(string $username = null): Account
+    {
+        $this->username = $username;
+
+        return $this;
+    }
+
+    public function setChatId(int $chatId): self
+    {
+        $this->chatId = $chatId;
+
+        return $this;
+    }
+
+    public function getChatId(): int
+    {
+        return $this->chatId;
+    }
+
+    /**
+     * @return User|null
+     */
+    public function getUser()
+    {
+        return $this->user;
+    }
+
+    public function setUser(User $user): Account
+    {
+        if (!$this->user && $user) {
+            $this->linkedAt = new \DateTime();
+        }
+
+        $this->user = $user;
+
+        return $this;
+    }
+
+    public function getUserId(): int
+    {
+        return $this->user->getId();
+    }
+
+    /**
+     * Disables all notifications
+     */
+    public function disableNotifications(): self
+    {
+        $this->subscriberNotification = false;
+        $this->renameNotification = false;
+
+        return $this;
+    }
+
+    public function setSubscriberNotification(bool $subscriberNotification): self
+    {
+        $this->subscriberNotification = $subscriberNotification;
+
+        return $this;
+    }
+
+    public function isSubscriberNotification(): bool
+    {
+        return $this->subscriberNotification;
+    }
+
+    public function setRenameNotification(bool $renameNotification): self
+    {
+        $this->renameNotification = $renameNotification;
+
+        return $this;
+    }
+
+    public function isRenameNotification(): bool
+    {
+        return $this->renameNotification;
+    }
+}
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Exception/Telegram/CommandProcessingException.php b/src/Skobkin/Bundle/PointToolsBundle/Exception/Telegram/CommandProcessingException.php
new file mode 100644
index 0000000..ae742c7
--- /dev/null
+++ b/src/Skobkin/Bundle/PointToolsBundle/Exception/Telegram/CommandProcessingException.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Skobkin\Bundle\PointToolsBundle\Exception\Telegram;
+
+
+class CommandProcessingException extends \Exception
+{
+
+}
\ No newline at end of file
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Repository/SubscriptionEventRepository.php b/src/Skobkin/Bundle/PointToolsBundle/Repository/SubscriptionEventRepository.php
index 8a8bef5..44b1dd1 100644
--- a/src/Skobkin/Bundle/PointToolsBundle/Repository/SubscriptionEventRepository.php
+++ b/src/Skobkin/Bundle/PointToolsBundle/Repository/SubscriptionEventRepository.php
@@ -3,7 +3,6 @@
 namespace Skobkin\Bundle\PointToolsBundle\Repository;
 
 use Doctrine\ORM\EntityRepository;
-use Doctrine\ORM\Mapping\ClassMetadata;
 use Doctrine\ORM\QueryBuilder;
 use Skobkin\Bundle\PointToolsBundle\Entity\SubscriptionEvent;
 use Skobkin\Bundle\PointToolsBundle\Entity\User;
@@ -11,9 +10,9 @@ use Skobkin\Bundle\PointToolsBundle\Entity\User;
 class SubscriptionEventRepository extends EntityRepository
 {
     /**
-     * @return integer
+     * @return int
      */
-    public function getLastDayEventsCount()
+    public function getLastDayEventsCount(): int
     {
         $qb = $this->createQueryBuilder('se');
 
@@ -34,7 +33,7 @@ class SubscriptionEventRepository extends EntityRepository
      *
      * @return QueryBuilder
      */
-    public function createUserLastSubscribersEventsQuery(User $user)
+    public function createUserLastSubscribersEventsQuery(User $user): QueryBuilder
     {
         $qb = $this->createQueryBuilder('se');
 
@@ -47,12 +46,28 @@ class SubscriptionEventRepository extends EntityRepository
         ;
     }
 
+    /**
+     * Get last user subscriber events
+     *
+     * @param User $user
+     * @param int $limit
+     *
+     * @return SubscriptionEvent[]
+     */
+    public function getUserLastSubscribersEvents(User $user, int $limit = 20): array
+    {
+        $qb = $this->createUserLastSubscribersEventsQuery($user);
+        $qb->setMaxResults($limit);
+
+        return $qb->getQuery()->getResult();
+    }
+
     /**
      * Get last global subscriptions QueryBuilder for pagination
      *
      * @return QueryBuilder
      */
-    public function createLastSubscriptionEventsQuery()
+    public function createLastSubscriptionEventsQuery(): QueryBuilder
     {
         $qb = $this->createQueryBuilder('se');
 
@@ -71,7 +86,7 @@ class SubscriptionEventRepository extends EntityRepository
      *
      * @return SubscriptionEvent[]
      */
-    public function getLastSubscriptionEvents($limit = 20)
+    public function getLastSubscriptionEvents(int $limit = 20): array
     {
         $qb = $this->createLastSubscriptionEventsQuery();
         $qb->setMaxResults($limit);
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Resources/config/services.yml b/src/Skobkin/Bundle/PointToolsBundle/Resources/config/services.yml
index 935bceb..61bbe9d 100644
--- a/src/Skobkin/Bundle/PointToolsBundle/Resources/config/services.yml
+++ b/src/Skobkin/Bundle/PointToolsBundle/Resources/config/services.yml
@@ -14,6 +14,7 @@ services:
         tags:
             - { name: guzzle.client }
 
+
     skobkin_point_tools.api_user:
         class: Skobkin\Bundle\PointToolsBundle\Service\UserApi
         arguments:
@@ -21,6 +22,7 @@ services:
             - "%point_use_https%"
             - "%point_api_base_url%"
             - @doctrine.orm.entity_manager
+            - @serializer
 
     skobkin_point_tools.api_post:
         class: Skobkin\Bundle\PointToolsBundle\Service\PostApi
@@ -30,26 +32,34 @@ services:
             - "%point_api_base_url%"
             - @skobkin__point_tools.service_factory.post_factory
 
+
     skobkin_point_tools.subscriptions_manager:
         class: Skobkin\Bundle\PointToolsBundle\Service\SubscriptionsManager
         arguments: [ @doctrine.orm.entity_manager ]
 
+
+    # Factories
+    # User factory
     skobkin__point_tools.service_factory.user_factory:
         class: Skobkin\Bundle\PointToolsBundle\Service\Factory\UserFactory
         arguments: [ @doctrine.orm.entity_manager ]
 
+    # Comment factory
     skobkin__point_tools.service_factory.comment_factory:
         class: Skobkin\Bundle\PointToolsBundle\Service\Factory\Blogs\CommentFactory
         arguments: [ @doctrine.orm.entity_manager, @skobkin__point_tools.service_factory.user_factory ]
 
+    # Tag factory
     skobkin__point_tools.service_factory.tag_factory:
         class: Skobkin\Bundle\PointToolsBundle\Service\Factory\Blogs\TagFactory
         arguments: [ @logger, @doctrine.orm.entity_manager ]
 
+    # File factory
     skobkin__point_tools.service_factory.file_factory:
         class: Skobkin\Bundle\PointToolsBundle\Service\Factory\Blogs\FileFactory
         arguments: [ @logger, @doctrine.orm.entity_manager ]
 
+    # Post factory
     skobkin__point_tools.service_factory.post_factory:
         class: Skobkin\Bundle\PointToolsBundle\Service\Factory\Blogs\PostFactory
         arguments:
@@ -60,21 +70,27 @@ services:
             - @skobkin__point_tools.service_factory.comment_factory
             - @skobkin__point_tools.service_factory.tag_factory
 
+    # Telegram accounts factory
+    point_tools.factory.telegram_account:
+        class: Skobkin\Bundle\PointToolsBundle\Service\Factory\Telegram\AccountFactory
+        arguments: [@doctrine.orm.entity_manager]
+
+
     # Custom Markdown parser
     markdown.parser.point:
         class: Skobkin\Bundle\PointToolsBundle\Service\Markdown\PointParser
-        arguments:
-            - []
-            - @router
+        arguments: [[], @router]
         tags:
             - { name: markdown.parser }
 
+
     # Event listener
     point_tools.event_listener.user_rename_subscriber:
         class: Skobkin\Bundle\PointToolsBundle\EventListener\UserRenameSubscriber
         tags:
             - { name: doctrine.event_subscriber, connection: default }
 
+
     # Twig extensions
     point_tools.twig.point_avatar_extension:
         class: Skobkin\Bundle\PointToolsBundle\Twig\PointUserExtension
@@ -83,17 +99,40 @@ services:
         tags:
             - { name: twig.extension }
 
-    # Telegram API client
+
+    # Telegram services
+    # API client
     point_tools.telegram.api_client:
         class: unreal4u\TelegramAPI\TgLog
         arguments: [%telegram_token%, @logger, @point_tools.http.telegram_client]
 
-    # Telegram simple message sender
+    # Simple message sender
     point_tools.telegram.simple_sender:
         class: Skobkin\Bundle\PointToolsBundle\Service\Telegram\SimpleSender
         arguments: [@point_tools.telegram.api_client]
 
-    # Telegram command processor
-    point_tools.telegram.update_processor:
-        class: Skobkin\Bundle\PointToolsBundle\Service\Telegram\IncomingUpdateProcessor
-        arguments: [%point_id%, @point_tools.telegram.api_client, @doctrine.orm.entity_manager, @twig]
\ No newline at end of file
+    # Common incoming message processor
+    point_tools.telegram.update_dispatcher:
+        class: Skobkin\Bundle\PointToolsBundle\Service\Telegram\IncomingUpdateDispatcher
+        arguments:
+            - @point_tools.telegram.private_message_processor
+            - @point_tools.telegram.inline_query_processor
+
+    # InlineQuery processor
+    point_tools.telegram.inline_query_processor:
+        class: Skobkin\Bundle\PointToolsBundle\Service\Telegram\InlineQueryProcessor
+        lazy: true
+        arguments: [@doctrine.orm.entity_manager, @point_tools.telegram.api_client]
+
+    # Private message processor
+    point_tools.telegram.private_message_processor:
+        class: Skobkin\Bundle\PointToolsBundle\Service\Telegram\PrivateMessageProcessor
+        lazy: true
+        arguments:
+            - @point_tools.telegram.api_client
+            - @skobkin_point_tools.api_user
+            - @point_tools.factory.telegram_account
+            - @doctrine.orm.entity_manager
+            - @twig
+            - %point_id%
+            - %point_login%
\ No newline at end of file
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/error.md.twig b/src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/error.md.twig
new file mode 100644
index 0000000..05f3344
--- /dev/null
+++ b/src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/error.md.twig
@@ -0,0 +1,7 @@
+*{{ title }}*
+{% if text %}
+
+{{ text }}
+{% endif %}
+
+[Send bug report](https://bitbucket.org/skobkin/point-tools/issues?status=new&status=open).
\ No newline at end of file
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/help.md.twig b/src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/help.md.twig
index 562b7ad..807a7d6 100644
--- a/src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/help.md.twig
+++ b/src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/help.md.twig
@@ -1,7 +1,10 @@
 *Help*:
 
+/me - Show your last subscriber events (/link needed)
+/link %login% %password% - Link your Telegram account with Point.im account
 /last - shows last global subscription events
 /last %user% - shows last user subscribers events
+/sub - Show user subscribers
 /help shows this message
 
 Visit [Point Tools](https://point.skobk.in/) for more info.
\ No newline at end of file
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/last_user_subscriptions.md.twig b/src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/last_user_subscriptions.md.twig
new file mode 100644
index 0000000..6f1bead
--- /dev/null
+++ b/src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/last_user_subscriptions.md.twig
@@ -0,0 +1,12 @@
+{# @var user \Skobkin\Bundle\PointToolsBundle\Entity\User #}
+*Last [@{{ user.login }}]({{ user.login|point_user_url(true) }}):*
+
+{% set subscription = constant('\\Skobkin\\Bundle\\PointToolsBundle\\Entity\\SubscriptionEvent::ACTION_SUBSCRIBE') %}
+{# @var event \Skobkin\Bundle\PointToolsBundle\Entity\SubscriptionEvent #}
+{% for event in events %}
+{% set sub_login = event.subscriber.login %}
+{{ event.date|date('d M y H:i') }} {% if subscription == event.action %} + {% else %} - {% endif %} [@{{ sub_login }}]({{ sub_login|point_user_url(true) }})
+{% endfor %}
+
+{# @todo remove hardcoded URL #}
+See more events on [Point Tools](https://point.skobk.in{{ path('user_show', {'login': user.login}) }}) site.
\ No newline at end of file
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/user_subscribers.md.twig b/src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/user_subscribers.md.twig
new file mode 100644
index 0000000..47bd43e
--- /dev/null
+++ b/src/Skobkin/Bundle/PointToolsBundle/Resources/views/Telegram/user_subscribers.md.twig
@@ -0,0 +1,11 @@
+{# @var user \Skobkin\Bundle\PointToolsBundle\Entity\User #}
+*@{{ user.login }} subscribers:*
+
+{% if subscribers|length > 0 %}
+{{ subscribers|join(', ') }}
+{% else %}
+No subscribers
+{% endif %}
+
+{# @todo remove hardcoded URL #}
+See more events on [Point Tools](https://point.skobk.in{{ path('user_show', {'login': user.login}) }}) site.
\ No newline at end of file
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Resources/views/User/show.html.twig b/src/Skobkin/Bundle/PointToolsBundle/Resources/views/User/show.html.twig
index 75ebe28..625ddda 100644
--- a/src/Skobkin/Bundle/PointToolsBundle/Resources/views/User/show.html.twig
+++ b/src/Skobkin/Bundle/PointToolsBundle/Resources/views/User/show.html.twig
@@ -23,7 +23,7 @@
                         <div class="panel-body">
                             <ul class="users mosaic">
                                 {% for user in subscribers %}
-                                    <li><a href="{{ url('user_show', {login: user.login}) }}">@{{ user.login }}</a></li>
+                                    <li><a href="{{ path('user_show', {login: user.login}) }}">@{{ user.login }}</a></li>
                                 {% endfor %}
                             </ul>
                         </div>
@@ -94,7 +94,7 @@
                 {% for event in subscriptions_log %}
                     <tr>
                         <td>
-                            <a href="{{ url('user_show', {login: event.subscriber.login}) }}">@{{ event.subscriber.login }}</a>
+                            <a href="{{ path('user_show', {login: event.subscriber.login}) }}">@{{ event.subscriber.login }}</a>
                         </td>
                         <td>
                             <span class="glyphicon {% if event.action == 'subscribe' %}glyphicon-plus{% elseif event.action == 'unsubscribe' %}glyphicon-minus{% endif %}"></span>
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Service/AbstractApi.php b/src/Skobkin/Bundle/PointToolsBundle/Service/AbstractApi.php
index f8f2594..cec0234 100644
--- a/src/Skobkin/Bundle/PointToolsBundle/Service/AbstractApi.php
+++ b/src/Skobkin/Bundle/PointToolsBundle/Service/AbstractApi.php
@@ -80,9 +80,7 @@ class AbstractApi
     public function sendPostRequest($path, array $parameters = [])
     {
         /** @var GuzzleRequest $request */
-        $request = $this->client->post($path, null, null, [
-            'form_params' => $parameters,
-        ]);
+        $request = $this->client->post($path, null, $parameters);
 
         return $request->send();
     }
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Service/Factory/Telegram/AccountFactory.php b/src/Skobkin/Bundle/PointToolsBundle/Service/Factory/Telegram/AccountFactory.php
new file mode 100644
index 0000000..8cb3e38
--- /dev/null
+++ b/src/Skobkin/Bundle/PointToolsBundle/Service/Factory/Telegram/AccountFactory.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace Skobkin\Bundle\PointToolsBundle\Service\Factory\Telegram;
+
+use Doctrine\ORM\EntityManagerInterface;
+use Doctrine\ORM\EntityRepository;
+use Skobkin\Bundle\PointToolsBundle\Entity\Telegram\Account;
+use unreal4u\TelegramAPI\Telegram\Types\Message;
+
+class AccountFactory
+{
+    /**
+     * @var EntityManagerInterface
+     */
+    private $em;
+
+    /**
+     * @var EntityRepository
+     */
+    private $accountRepo;
+
+
+    public function __construct(EntityManagerInterface $em)
+    {
+        $this->em = $em;
+        $this->accountRepo = $em->getRepository('SkobkinPointToolsBundle:Telegram\Account');
+    }
+
+    public function findOrCreateFromMessage(Message $message): Account
+    {
+        if (null === $account = $this->accountRepo->findOneBy(['id' => $message->from->id])) {
+            $account = new Account($message->from->id);
+            $this->em->persist($account);
+        }
+
+        // Setting/updating account data
+        $account
+            ->setFirstName($message->from->first_name)
+            ->setLastName($message->from->last_name)
+            ->setUsername($message->from->username)
+            ->setChatId($message->chat->id)
+        ;
+
+        return $account;
+    }
+}
\ No newline at end of file
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/IncomingUpdateDispatcher.php b/src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/IncomingUpdateDispatcher.php
new file mode 100644
index 0000000..225f54e
--- /dev/null
+++ b/src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/IncomingUpdateDispatcher.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace Skobkin\Bundle\PointToolsBundle\Service\Telegram;
+
+use unreal4u\TelegramAPI\Telegram\Types\Inline\Query;
+use unreal4u\TelegramAPI\Telegram\Types\Message;
+use unreal4u\TelegramAPI\Telegram\Types\Update;
+
+/**
+ * Dispatches incoming messages processing to corresponding services
+ */
+class IncomingUpdateDispatcher
+{
+    const CHAT_TYPE_PRIVATE = 'private';
+    const CHAT_TYPE_GROUP = 'group';
+
+    /**
+     * @var InlineQueryProcessor
+     */
+    private $inlineQueryProcessor;
+
+    /**
+     * @var PrivateMessageProcessor
+     */
+    private $privateMessageProcessor;
+
+
+    public function __construct(PrivateMessageProcessor $privateMessageProcessor, InlineQueryProcessor $inlineQueryProcessor)
+    {
+        $this->privateMessageProcessor = $privateMessageProcessor;
+        $this->inlineQueryProcessor = $inlineQueryProcessor;
+    }
+
+    /**
+     * Processes update and delegates it to corresponding service
+     *
+     * @param Update $update
+     */
+    public function process(Update $update)
+    {
+        if ($update->message && $update->message instanceof Message) {
+            $chatType = $update->message->chat->type;
+
+            if (self::CHAT_TYPE_PRIVATE === $chatType) {
+                $this->privateMessageProcessor->process($update->message);
+            } elseif (self::CHAT_TYPE_GROUP === $chatType) {
+                // @todo implement
+            }
+        } elseif ($update->inline_query && $update->inline_query instanceof Query) {
+            $this->inlineQueryProcessor->process($update->inline_query);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/IncomingUpdateProcessor.php b/src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/IncomingUpdateProcessor.php
deleted file mode 100644
index 2315798..0000000
--- a/src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/IncomingUpdateProcessor.php
+++ /dev/null
@@ -1,170 +0,0 @@
-<?php
-
-namespace Skobkin\Bundle\PointToolsBundle\Service\Telegram;
-
-use Doctrine\ORM\EntityManagerInterface;
-use unreal4u\TelegramAPI\Telegram\Methods\AnswerInlineQuery;
-use unreal4u\TelegramAPI\Telegram\Methods\SendMessage;
-use unreal4u\TelegramAPI\Telegram\Types\Inline\Query;
-use unreal4u\TelegramAPI\Telegram\Types\InputMessageContent\Text;
-use unreal4u\TelegramAPI\Telegram\Types\Message;
-use unreal4u\TelegramAPI\Telegram\Types\Update;
-use unreal4u\TelegramAPI\TgLog;
-
-/**
- * @todo refactor
- */
-class IncomingUpdateProcessor
-{
-    const CHAT_TYPE_PRIVATE = 'private';
-    const CHAT_TYPE_GROUP = 'group';
-
-    const PARSE_MODE_MARKDOWN = 'Markdown';
-    const PARSE_MODE_HTML5 = 'HTML';
-
-    /**
-     * @var TgLog
-     */
-    private $client;
-
-    /**
-     * @var EntityManagerInterface
-     */
-    private $em;
-
-    /**
-     * @var \Twig_Environment
-     */
-    private $twig;
-
-    /**
-     * @var int
-     */
-    private $pointUserId;
-
-    /**
-     * @param TgLog $client
-     */
-    public function __construct(int $pointUserId, TgLog $client, EntityManagerInterface $em, \Twig_Environment $twig)
-    {
-        $this->client = $client;
-        $this->em = $em;
-        $this->twig = $twig;
-        $this->pointUserId = $pointUserId;
-    }
-
-    /**
-     * Processes update and delegates it to corresponding service
-     *
-     * @param Update $update
-     */
-    public function process(Update $update)
-    {
-        if ($update->message && $update->message instanceof Message) {
-            $chatType = $update->message->chat->type;
-
-            if (self::CHAT_TYPE_PRIVATE === $chatType) {
-                $this->processPrivateMessage($update);
-            } elseif (self::CHAT_TYPE_GROUP === $chatType) {
-
-            }
-        } elseif ($update->inline_query && $update->inline_query instanceof Query) {
-            $this->processInlineQuery($update);
-        }
-
-    }
-
-    /**
-     * @todo refactor
-     *
-     * @param Update $update
-     */
-    private function processPrivateMessage(Update $update)
-    {
-        $chatId = $update->message->chat->id;
-        $text = $update->message->text;
-
-        $sendMessage = new SendMessage();
-        $sendMessage->chat_id = $chatId;
-        $sendMessage->parse_mode = self::PARSE_MODE_MARKDOWN;
-        $sendMessage->disable_web_page_preview = true;
-
-        $words = explode(' ', $text, 3);
-
-        if (0 === count($words)) {
-            return;
-        }
-
-        switch ($words[0]) {
-            case 'l':
-            case '/last':
-            case 'last':
-                if (array_key_exists(1, $words)) {
-                    $sendMessage->text = 'Not implemented yet :(';
-                } else {
-                    $events = $this->em->getRepository('SkobkinPointToolsBundle:SubscriptionEvent')->getLastSubscriptionEvents(10);
-                    $sendMessage->text = $this->twig->render('@SkobkinPointTools/Telegram/last_global_subscriptions.md.twig', ['events' => $events]);
-                }
-
-                break;
-
-            case 'sub':
-            case '/sub':
-            case 'subscribers':
-                $sendMessage->text = 'Subscribers list here...';
-                break;
-
-            case 'stats':
-            case '/stats':
-                $stats = [
-                    'total_users' => $this->em->getRepository('SkobkinPointToolsBundle:User')->getUsersCount(),
-                    'active_users' => $this->em->getRepository('SkobkinPointToolsBundle:Subscription')->getUserSubscribersCountById($this->pointUserId),
-                    'today_events' => $this->em->getRepository('SkobkinPointToolsBundle:SubscriptionEvent')->getLastDayEventsCount(),
-                ];
-
-                $sendMessage->text = $this->twig->render('@SkobkinPointTools/Telegram/stats.md.twig', $stats);
-
-                break;
-
-            case '/help':
-            default:
-                $sendMessage->text = $this->twig->render('@SkobkinPointTools/Telegram/help.md.twig');
-                break;
-        }
-
-        $this->client->performApiRequest($sendMessage);
-    }
-
-    private function processInlineQuery(Update $update)
-    {
-        $queryId = $update->inline_query->id;
-        $text = $update->inline_query->query;
-
-        if (mb_strlen($text) < 2) {
-            return;
-        }
-
-        $answerInlineQuery = new AnswerInlineQuery();
-        $answerInlineQuery->inline_query_id = $queryId;
-
-        foreach ($this->em->getRepository('SkobkinPointToolsBundle:User')->findUsersLikeLogin($text) as $user) {
-            $article = new Query\Result\Article();
-            $article->title = $user->getLogin();
-
-            $contentText = new Text();
-            $contentText->message_text = sprintf(
-                "@%s:\nName: %s\nSubscribers: %d",
-                $user->getLogin(),
-                $user->getName(),
-                $user->getSubscribers()->count()
-            );
-
-            $article->input_message_content = $contentText;
-            $article->id = md5($user->getId());
-
-            $answerInlineQuery->addResult($article);
-        }
-
-        $this->client->performApiRequest($answerInlineQuery);
-    }
-}
\ No newline at end of file
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/InlineQueryProcessor.php b/src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/InlineQueryProcessor.php
new file mode 100644
index 0000000..032d51e
--- /dev/null
+++ b/src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/InlineQueryProcessor.php
@@ -0,0 +1,68 @@
+<?php
+
+namespace Skobkin\Bundle\PointToolsBundle\Service\Telegram;
+
+
+use Doctrine\ORM\EntityManagerInterface;
+use Skobkin\Bundle\PointToolsBundle\Repository\UserRepository;
+use unreal4u\TelegramAPI\Telegram\Methods\AnswerInlineQuery;
+use unreal4u\TelegramAPI\Telegram\Types\Inline\Query;
+use unreal4u\TelegramAPI\Telegram\Types\InputMessageContent\Text;
+use unreal4u\TelegramAPI\TgLog;
+
+class InlineQueryProcessor
+{
+    /**
+     * @var EntityManagerInterface
+     */
+    private $em;
+
+    /**
+     * @var UserRepository
+     */
+    private $userRepo;
+
+    /**
+     * @var TgLog
+     */
+    private $client;
+
+
+    public function __construct(EntityManagerInterface $em, TgLog $client)
+    {
+        $this->em = $em;
+        $this->client = $client;
+
+        $this->userRepo = $em->getRepository('SkobkinPointToolsBundle:User');
+    }
+
+    public function process(Query $inlineQuery)
+    {
+        if (mb_strlen($inlineQuery->query) < 2) {
+            return;
+        }
+
+        $answerInlineQuery = new AnswerInlineQuery();
+        $answerInlineQuery->inline_query_id = $inlineQuery->id;
+
+        foreach ($this->em->getRepository('SkobkinPointToolsBundle:User')->findUsersLikeLogin($inlineQuery->query) as $user) {
+            $article = new Query\Result\Article();
+            $article->title = $user->getLogin();
+
+            $contentText = new Text();
+            $contentText->message_text = sprintf(
+                "@%s:\nName: %s\nSubscribers: %d",
+                $user->getLogin(),
+                $user->getName(),
+                $user->getSubscribers()->count()
+            );
+
+            $article->input_message_content = $contentText;
+            $article->id = md5($user->getId());
+
+            $answerInlineQuery->addResult($article);
+        }
+
+        $this->client->performApiRequest($answerInlineQuery);
+    }
+}
\ No newline at end of file
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/PrivateMessageProcessor.php b/src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/PrivateMessageProcessor.php
new file mode 100644
index 0000000..c900c3c
--- /dev/null
+++ b/src/Skobkin/Bundle/PointToolsBundle/Service/Telegram/PrivateMessageProcessor.php
@@ -0,0 +1,307 @@
+<?php
+
+namespace Skobkin\Bundle\PointToolsBundle\Service\Telegram;
+
+use Doctrine\ORM\EntityManagerInterface;
+use Skobkin\Bundle\PointToolsBundle\Entity\Telegram\Account;
+use Skobkin\Bundle\PointToolsBundle\Entity\User;
+use Skobkin\Bundle\PointToolsBundle\Exception\Telegram\CommandProcessingException;
+use Skobkin\Bundle\PointToolsBundle\Repository\SubscriptionEventRepository;
+use Skobkin\Bundle\PointToolsBundle\Repository\SubscriptionRepository;
+use Skobkin\Bundle\PointToolsBundle\Repository\UserRepository;
+use Skobkin\Bundle\PointToolsBundle\Service\Factory\Telegram\AccountFactory;
+use Skobkin\Bundle\PointToolsBundle\Service\UserApi;
+use unreal4u\TelegramAPI\Telegram\Methods\SendMessage;
+use unreal4u\TelegramAPI\Telegram\Types\Message;
+use unreal4u\TelegramAPI\TgLog;
+
+/**
+ * Processes all private messages
+ */
+class PrivateMessageProcessor
+{
+    const TEMPLATE_ERROR = '@SkobkinPointTools/Telegram/error.md.twig';
+    const TEMPLATE_STATS = '@SkobkinPointTools/Telegram/stats.md.twig';
+    const TEMPLATE_HELP = '@SkobkinPointTools/Telegram/help.md.twig';
+    const TEMPLATE_LAST_EVENTS = '@SkobkinPointTools/Telegram/last_global_subscriptions.md.twig';
+    const TEMPLATE_LAST_USER_SUB_EVENTS = '@SkobkinPointTools/Telegram/last_user_subscriptions.md.twig';
+    const TEMPLATE_USER_SUBSCRIBERS = '@SkobkinPointTools/Telegram/user_subscribers.md.twig';
+
+    const PARSE_MODE_MARKDOWN = 'Markdown';
+    const PARSE_MODE_HTML5 = 'HTML';
+
+    /**
+     * @var TgLog
+     */
+    private $client;
+
+    /**
+     * @var UserApi
+     */
+    private $userApi;
+
+    /**
+     * @var AccountFactory
+     */
+    private $accountFactory;
+
+    /**
+     * @var EntityManagerInterface
+     */
+    private $em;
+
+    /**
+     * @var \Twig_Environment
+     */
+    private $twig;
+
+    /**
+     * @var UserRepository
+     */
+    private $userRepo;
+
+    /**
+     * @var SubscriptionRepository
+     */
+    private $subscriptionRepo;
+
+    /**
+     * @var SubscriptionEventRepository
+     */
+    private $subscriptionEventRepo;
+
+    /**
+     * @var int
+     */
+    private $pointUserId;
+
+    /**
+     * @var string
+     */
+    private $pointUserLogin;
+
+
+    public function __construct(
+        TgLog $client,
+        UserApi $userApi,
+        AccountFactory $accountFactory,
+        EntityManagerInterface $em,
+        \Twig_Environment $twig,
+        int $pointUserId,
+        string $pointUserLogin
+    )
+    {
+        $this->client = $client;
+        $this->userApi = $userApi;
+        $this->accountFactory = $accountFactory;
+        $this->em = $em;
+        $this->twig = $twig;
+        $this->pointUserId = $pointUserId;
+        $this->pointUserLogin = $pointUserLogin;
+
+        $this->userRepo = $em->getRepository('SkobkinPointToolsBundle:User');
+        $this->subscriptionRepo = $em->getRepository('SkobkinPointToolsBundle:Subscription');
+        $this->subscriptionEventRepo = $em->getRepository('SkobkinPointToolsBundle:SubscriptionEvent');
+    }
+
+    public function process(Message $message)
+    {
+        if (!IncomingUpdateDispatcher::CHAT_TYPE_PRIVATE === $message->chat->type) {
+            throw new \InvalidArgumentException('This service can process only private chat messages');
+        }
+
+        // Registering Telegram user
+        /** @var Account $account */
+        $account = $this->accountFactory->findOrCreateFromMessage($message);
+        $this->em->flush();
+
+        // Creating blank response for later use
+        $sendMessage = $this->createResponseMessage($message, self::PARSE_MODE_MARKDOWN, true);
+
+        $words = explode(' ', $message->text, 4);
+
+        if (0 === count($words)) {
+            return;
+        }
+
+        try {
+            switch ($words[0]) {
+                case '/link':
+                case 'link':
+                    if (array_key_exists(2, $words)) {
+                        if ($this->linkAccount($account, $words[1], $words[2])) {
+                            // Saving linking status
+                            $this->em->flush();
+                            $this->sendAccountLinked($sendMessage);
+                        } else {
+                            $this->sendError($sendMessage, 'Account linking error', 'Check login and password or try again later.');
+                        }
+                    } else {
+                        $this->sendError($sendMessage, 'Login/Password error', 'You need to specify login and password separated by space after /link (example: `/link mylogin MypASSw0rd`)');
+                    }
+                    break;
+
+                case '/me':
+                case 'me':
+                    if ($user = $account->getUser()) {
+                        $this->sendUserEvents($sendMessage, $user);
+                    } else {
+                        $this->sendError($sendMessage, 'Account not linked', 'You must /link your account first to be able to use this command.');
+                    }
+                    break;
+
+                case '/last':
+                case 'l':
+                case 'last':
+                    if (array_key_exists(1, $words)) {
+                        if (null !== $user = $this->userRepo->findUserByLogin($words[1])) {
+                            $this->sendUserEvents($sendMessage, $user);
+                        } else {
+                            $this->sendError($sendMessage, 'User not found');
+                        }
+                    } else {
+                        $this->sendGlobalEvents($sendMessage);
+                    }
+
+                    break;
+
+                case '/sub':
+                case 'sub':
+                case 'subscribers':
+                    if (array_key_exists(1, $words)) {
+                        if (null !== $user = $this->userRepo->findUserByLogin($words[1])) {
+                            $this->sendUserSubscribers($sendMessage, $user);
+                        } else {
+                            $this->sendError($sendMessage, 'User not found');
+                        }
+                    } else {
+                        $user = $this->userRepo->findUserByLogin($this->pointUserLogin);
+                        $this->sendUserSubscribers($sendMessage, $user);
+                    }
+
+                    break;
+
+                case '/stats':
+                case 'stats':
+                    $this->sendStats($sendMessage);
+
+                    break;
+
+                case '/help':
+                default:
+                    $this->sendHelp($sendMessage);
+                    break;
+            }
+        } catch (CommandProcessingException $e) {
+            $this->sendError($sendMessage, 'Processing error', $e->getMessage());
+
+            if ($e->getPrevious()) {
+                throw $e->getPrevious();
+            }
+        } catch (\Exception $e) {
+            $this->sendError($sendMessage, 'Unknown error');
+
+            throw $e;
+        }
+    }
+
+    private function linkAccount(Account $account, string $login, string $password): bool
+    {
+        if ($this->userApi->isAuthDataValid($login, $password)) {
+            /** @var User $user */
+            if (null === $user = $this->userRepo->findOneBy(['login' => $login])) {
+                throw new CommandProcessingException('User not found in Point Tools database. Please try again later.');
+            }
+
+            $account->setUser($user);
+
+            return true;
+        }
+
+        return false;
+    }
+
+    private function sendAccountLinked(SendMessage $sendMessage)
+    {
+        $sendMessage->text = 'Account linked. Try using /me now.';
+
+        $this->client->performApiRequest($sendMessage);
+    }
+
+    private function sendUserSubscribers(SendMessage $sendMessage, User $user)
+    {
+        $subscribers = [];
+
+        foreach ($user->getSubscribers() as $subscription) {
+            $subscribers[] = '@'.$subscription->getSubscriber()->getLogin();
+        }
+
+        $sendMessage->text = $this->twig->render(self::TEMPLATE_USER_SUBSCRIBERS, [
+            'user' => $user,
+            'subscribers' => $subscribers,
+        ]);
+
+        $this->client->performApiRequest($sendMessage);
+    }
+
+    /**
+     * @param SendMessage $sendMessage
+     * @param User $user
+     */
+    private function sendUserEvents(SendMessage $sendMessage, User $user)
+    {
+        $events = $this->subscriptionEventRepo->getUserLastSubscribersEvents($user, 10);
+        $sendMessage->text = $this->twig->render(self::TEMPLATE_LAST_USER_SUB_EVENTS, [
+            'user' => $user,
+            'events' => $events,
+        ]);
+
+        $this->client->performApiRequest($sendMessage);
+    }
+
+    private function sendGlobalEvents(SendMessage $sendMessage)
+    {
+        $events = $this->subscriptionEventRepo->getLastSubscriptionEvents(10);
+        $sendMessage->text = $this->twig->render(self::TEMPLATE_LAST_EVENTS, ['events' => $events]);
+
+        $this->client->performApiRequest($sendMessage);
+    }
+
+    private function sendStats(SendMessage $sendMessage)
+    {
+        $sendMessage->text = $this->twig->render(self::TEMPLATE_STATS, [
+            'total_users' => $this->userRepo->getUsersCount(),
+            'active_users' => $this->subscriptionRepo->getUserSubscribersCountById($this->pointUserId),
+            'today_events' => $this->subscriptionEventRepo->getLastDayEventsCount(),
+        ]);
+
+        $this->client->performApiRequest($sendMessage);
+    }
+
+    private function sendHelp(SendMessage $sendMessage)
+    {
+        $sendMessage->text = $this->twig->render(self::TEMPLATE_HELP);
+
+        $this->client->performApiRequest($sendMessage);
+    }
+
+    private function sendError(SendMessage $sendMessage, string $title, string $text = '')
+    {
+        $sendMessage->text = $this->twig->render(self::TEMPLATE_ERROR, [
+            'title' => $title,
+            'text' => $text,
+        ]);
+
+        $this->client->performApiRequest($sendMessage);
+    }
+
+    private function createResponseMessage(Message $message, string $parseMode = self::PARSE_MODE_MARKDOWN, bool $disableWebPreview = false): SendMessage
+    {
+        $sendMessage = new SendMessage();
+        $sendMessage->chat_id = $message->chat->id;
+        $sendMessage->parse_mode = $parseMode;
+        $sendMessage->disable_web_page_preview = $disableWebPreview;
+
+        return $sendMessage;
+    }
+}
\ No newline at end of file
diff --git a/src/Skobkin/Bundle/PointToolsBundle/Service/UserApi.php b/src/Skobkin/Bundle/PointToolsBundle/Service/UserApi.php
index 544f742..a7166e0 100644
--- a/src/Skobkin/Bundle/PointToolsBundle/Service/UserApi.php
+++ b/src/Skobkin/Bundle/PointToolsBundle/Service/UserApi.php
@@ -6,6 +6,8 @@ use Doctrine\ORM\EntityManager;
 use Doctrine\ORM\EntityRepository;
 use Guzzle\Http\Exception\ClientErrorResponseException;
 use Guzzle\Service\Client;
+use JMS\Serializer\Serializer;
+use Skobkin\Bundle\PointToolsBundle\DTO\Api\Auth;
 use Skobkin\Bundle\PointToolsBundle\Entity\User;
 use Skobkin\Bundle\PointToolsBundle\Service\Exceptions\ApiException;
 use Skobkin\Bundle\PointToolsBundle\Service\Exceptions\InvalidResponseException;
@@ -36,12 +38,18 @@ class UserApi extends AbstractApi
      */
     protected $userRepository;
 
+    /**
+     * @var Serializer
+     */
+    private $serializer;
 
-    public function __construct(Client $httpClient, $https = true, $baseUrl = null, EntityManager $entityManager)
+
+    public function __construct(Client $httpClient, $https = true, $baseUrl = null, EntityManager $entityManager, Serializer $serializer)
     {
         parent::__construct($httpClient, $https, $baseUrl);
 
         $this->em = $entityManager;
+        $this->serializer = $serializer;
         $this->userRepository = $this->em->getRepository('SkobkinPointToolsBundle:User');
     }
 
@@ -50,6 +58,57 @@ class UserApi extends AbstractApi
         return 'skobkin_point_tools_api_user';
     }
 
+    public function isAuthDataValid(string $login, string $password): bool
+    {
+        $auth = $this->authenticate($login, $password);
+
+        if (!$auth->getError() && $auth->getToken()) {
+            $this->logout($auth);
+
+            return true;
+        }
+
+        return false;
+    }
+
+    public function authenticate(string $login, string $password): Auth
+    {
+        try {
+            $authData = $this->getPostRequestData(
+                '/api/login',
+                [
+                    'login' => $login,
+                    'password' => $password,
+                ]
+            );
+
+            return $this->serializer->deserialize($authData, Auth::class, 'json');
+        } catch (ClientErrorResponseException $e) {
+            if (Response::HTTP_NOT_FOUND === $e->getResponse()->getStatusCode()) {
+                throw new InvalidResponseException('API method not found', 0, $e);
+            } else {
+                throw $e;
+            }
+        }
+    }
+
+    public function logout(Auth $auth): bool
+    {
+        try {
+            $this->getPostRequestData('/api/logout', ['csrf_token' => $auth->getCsRfToken()]);
+
+            return true;
+        } catch (ClientErrorResponseException $e) {
+            if (Response::HTTP_NOT_FOUND === $e->getResponse()->getStatusCode()) {
+                throw new InvalidResponseException('API method not found', 0, $e);
+            } elseif (Response::HTTP_FORBIDDEN === $e->getResponse()->getStatusCode()) {
+                return true;
+            } else {
+                throw $e;
+            }
+        }
+    }
+
     /**
      * Get user subscribers by user login
      *