telegram source Telegram Source

Provided by: "Apache Software Foundation"

Support Level for this Kamelet is: "Preview"

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

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
Fields marked with (*) are mandatory.

Usage

This section summarizes how the telegram-source can be used in various contexts.

Knative Source

The telegram-source Kamelet can be used as 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

Make sure you have Camel K installed into the Kubernetes cluster you’re connected to.

Save the telegram-source-binding.yaml file into your hard drive, then configure it according to your needs.

You can run the source using the following command:

kubectl apply -f telegram-source-binding.yaml

Dependencies

The Kamelet needs the following dependencies:

  • camel:jackson

  • camel:kamelet

  • camel:telegram

  • camel:core

Binding to Knative using the Kamel CLI:

The procedure described above can be simplified into a single execution of the kamel bind command:

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

This will create the KameletBinding under the hood and apply it to the current namespace in the cluster.

Kafka Source

The telegram-source Kamelet can be used as 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

Ensure that you’ve installed Strimzi and created a topic named my-topic in the current namespace. Make also sure you have Camel K installed into the Kubernetes cluster you’re connected to.

Save the telegram-source-binding.yaml file into your hard drive, then configure it according to your needs.

You can run the source using the following command:

kubectl apply -f telegram-source-binding.yaml

Binding to Kafka using the Kamel CLI:

The procedure described above can be simplified into a single execution of the kamel bind command:

kamel bind telegram-source -p "source.authorizationToken=The Token" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic

This will create the KameletBinding under the hood and apply it to the current namespace in the cluster.

Kamelet source file

Have a look at the following link:

https://github.com/apache/camel-kamelets/blob/main/telegram-source.kamelet.yaml

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