For more information, see IAM Policies for AWS Chatbot. This is a user-defined role that AWS Chatbot will assume. The ARN of the IAM role that defines the permissions for AWS Chatbot. Secret pathĪs mentioned in the Telegram documentation, it’s a good idea to provide a secret value in the path so you can be sure updates are coming from Telegram and not somewhere else.Terraform module setting up Slack notifications from AWS using AWS Chatbot.įind instructions to deploy this on: Requirements Name That’s why we need to separate the integration from the API. But if the aws_apigatewayv2_api depends on the Lambda function then the Lambda can’t depend on the API. In this implementation the Lambda sets the webhook (as we’ll cover later), so it needs the API’s endpoint URL. It seems like a lot of resources, and you may be wondering why not just take advantage of the target argument that also creates the integration, the route, and the stage? The resources you’ll need to create and configure this API: ![]() It provides a publicly-accessible URL that forwards all requests to the function and returns its results, which is all we need for a webhook. To add a proper HTTP endpoint to a function, you can use an HTTP API service. Because of this, this is usually not the way to provide a way to call a Lambda function. While the Lambda service provides a way to invoke a function with an HTTP request it requires a specific structure and a signature calculated using AWS’s signature algorithm. To provide an HTTP endpoint that can work as a webhook, we need an API Gateway that forwards requests to the Lambda function. The Lambda function can run whenever there is a new event, process it in some way, then wait for the next message. It also fits nicely into the serverless application model. It provides a way to process these events in real-time, so a bot will be responsive to incoming messages. While the bot could fetch these updates periodically using the getUpdates function, it is better to set up a webhook.Ī webhook is an HTTP endpoint that Telegram calls when there is an event for the bot. When a user sends a message to the bot, it generates an Update. Lower costs by staying in the standard SSM Parameter Store throughput limits Webhook Anyone who has access to any of these has access to the token. And accessing the code can happen in many places, from the version control, to deployment, to the actual function running on AWS. What’s wrong with adding the token to the code? Anyone who has access to the code can extract this value. Even environment variables are not suitable for this. This is wrong on many levels, as it is a secret value it should not be hardcoded anywhere in the code. When I researched for this article I found that most tutorials jump to code at this point and define a variable for this token. This token is the key to the bot, it allows anyone to send and receive messages, set the webhook, and practically everything the bot can do. If you are successful, it gives you an access token:Īs BotFather tells you, it is a secret value and don’t show it to anyone (if you are wondering, the token on the image is invalidated). Start a chat and choose a bot name that is available. By the end of the article, you’ll have a bot that you can deploy with a single command and then anyone can interact with it.īut first, let’s register a new bot! You’ll need a bot for this, BotFather. We’ll take a detailed look into all of them and discuss best practices. When deploying a Telegram bot (or any similar one), 3 areas need extra care: It runs on AWS Lambda behind an HTTP API and implements a simple echo functionality: whatever you send to it, it echoes it back. In this article, we’ll deploy a serverless Telegram bot to AWS using Terraform. ![]() That’s what prompted me to look into it in a bit more detail and start experimenting. For simple or personal projects, taking advantage of the platform makes things easier. With Telegram, you get push notifications, account security with 2-factor authentication (phone number and an optional password), chat history, form support, and more. Why build on an existing platform and not start a separate project, probably a website? It could start EC2 instances, monitor Kubernetes clusters in GCP, or send a notification when a backup is completed. Since you, the developer, control the bot, you can define how it interacts with your environment. This opens a wide range of what’s possible on the platform: sending commands to a system, receiving security notifications, or any other integration. Users can start chatting with bots and these bots can send message to users. Telegram, one of the biggest messenger platform, offers a Bot API that allows third-party automation. Code is available on GitHub Telegram bots
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