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Chapter 54. Telegram Source

Important

The Telegram Source Kamelet is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production.

These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. For more information about the support scope of Red Hat Technology Preview features, see https://access.redhat.com/support/offerings/techpreview.

Receive all messages that people send to your Telegram bot.

To create a bot, contact the @botfather account using the Telegram app.

The source attaches the following headers to the messages:

chat-id / ce-chatid: the ID of the chat where the message comes from

54.1. Configuration Options

The following table summarizes the configuration options available for the telegram-source Kamelet:

Property	Name	Description	Type	Default	Example
authorizationToken *	Token	The token to access your bot on Telegram. You you can obtain it from the Telegram @botfather.	string

Note

Fields marked with an asterisk (*) are mandatory.

54.2. Dependencies

At runtime, the telegram-source Kamelet relies upon the presence of the following dependencies:

camel:jackson
camel:kamelet
camel:telegram
camel:core

54.3. Usage

This section describes how you can use the telegram-source.

54.3.1. Knative Source

You can use the telegram-source Kamelet as a Knative source by binding it to a Knative object.

telegram-source-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: telegram-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: telegram-source
    properties:
      authorizationToken: "The Token"
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel

54.3.1.1. Prerequisite

Make sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.

54.3.1.2. Procedure for using the cluster CLI

Save the telegram-source-binding.yaml file to your local drive, and then edit it as needed for your configuration.
Run the source by using the following command:
```
oc apply -f telegram-source-binding.yaml
```

54.3.1.3. Procedure for using the Kamel CLI

Configure and run the source by using the following command:

kamel bind telegram-source -p "source.authorizationToken=The Token" channel:mychannel

This command creates the KameletBinding in the current namespace on the cluster.

54.3.2. Kafka Source

You can use the telegram-source Kamelet as a Kafka source by binding it to a Kafka topic.

telegram-source-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: telegram-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: telegram-source
    properties:
      authorizationToken: "The Token"
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic

54.3.2.1. Prerequisites

Ensure that you’ve installed the AMQ Streams operator in your OpenShift cluster and created a topic named my-topic in the current namespace. Make also sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.

54.3.2.2. Procedure for using the cluster CLI

Save the telegram-source-binding.yaml file to your local drive, and then edit it as needed for your configuration.
Run the source by using the following command:
```
oc apply -f telegram-source-binding.yaml
```

54.3.2.3. Procedure for using the Kamel CLI