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Creation of VK chatbot based on VkBotCore C #

This article was created for lazy people who do not want to code a lot and deal with all the "stuffing".

Group training


First, we need to create a community that will be tied to our bot.

To do this, go to the "Communities" section and click "Create Community"

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Now we will configure it to work with Callback-API // More about Callback-API

Go to "Management" >>

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>> โ€œSettingsโ€ >> โ€œWorking with the APIโ€

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We create an access key with all permissions and write it out, it will come in handy for us.

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Next, go to the Callback-API tab, select the latest version of the API and write out the confirmation code specified. It

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remains to turn on the messages. Go to the section "Messages" >> "Settings for the bot" turn on and save the setting

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Server Preparation



To work, the bot needs a place where it will be launched. Any hosting is suitable for this, because .NET Core can be launched from any platform.

I considered an example with a VPS server on Ubuntu 18.04.

On a clean server for the bot to work, you need to install .NET Core at least version 2.2.

We enter the following commands:
The command to register the Microsoft key and web feed:

> wget -q https://packages.microsoft.com/config/ubuntu/19.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb

Updating the products available for installation:

> sudo apt-get update
> sudo apt-get install apt-transport-https
> sudo apt-get update

Now install the .NET Core itself.
For the Runtime version, enter the command:

> sudo apt-get install aspnetcore-runtime-3.1

For Software Development Kit version:

> sudo apt-get install dotnet-sdk-3.1

After installing the environment, check its readiness with the command:

> dotnet --info

Installation and setup


We pass directly to the bot.

Download and unload the archive with the assembly.

Open the appsettings.json file .

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Insert the access key and the confirmation key saved earlier in the AccessToken value and the Confirmation value .

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Save and go back to the console.

With the ใ€Šcd " "ใ€‹command, go to the assembly folder and enter the command to start:

> dotnet vkBotCore.dll

It remains to bind the bot to the group. To do this, in the Callback-API section, in the address field, enter the domain to which the server is attached with the path / api / callback.

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If everything is done correctly, a green checkmark will appear after confirmation.

Plugin creation


The basic functions of VkBotCore as a chatbot include only 2 commands: / help and / everyone.
To increase the functionality, you need to write a plugin.

Plugins are a class library with the basic functionality needed to connect as a plugin.

Let's create a new project.

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Connect the vkBotCore.dll library from the assembly to the project.

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Add using to vkBotCore.Plugins and inherit the main class from Plugin

using vkBotCore.Plugins;

namespace myPlugin
{
    public class MyFirstPlugin : Plugin
    {
    }
}

Add hello command so that it responds Hi {name}

using vkBotCore.Plugins;
using vkBotCore.Plugins.Attributes;

namespace myPlugin
{
    public class MyFirstPlugin : Plugin
    {
        [Command]
        public void Hello(CommandContext context)
        {
            context.Chat.SendMessage($" {context.Sender.GetMentionLine()}");
        }
    }
}

Now create a new folder in the assembly folder called plugins.
Save the assembled plugin

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p.s. in it . For the commands to work, in the settings "Calback-API" >> "Event types" you need to enable notification of incoming messages.

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Run and check:

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Related Materials


Archives of the assembly and test plugin
VkBotCore source code
Article with a chat bot based on ASP.NET Core, VkNet C #

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