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Chapter 67. Telegram Source

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

67.1. Configuration Options
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The following table summarizes the configuration options available for the telegram-source Kamelet:

Expand
PropertyNameDescriptionTypeDefaultExample

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.

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

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

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

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

67.3.1.2. Procedure for using the cluster CLI
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  1. Save the telegram-source-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the source by using the following command: 

    oc apply -f telegram-source-binding.yaml
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67.3.1.3. Procedure for using the Kamel CLI
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Configure and run the source by using the following command: 

kamel bind telegram-source -p "source.authorizationToken=The Token" channel:mychannel
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This command creates the KameletBinding in the current namespace on the cluster.

67.3.2. Kafka Source
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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
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67.3.2.1. Prerequisites
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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.

67.3.2.2. Procedure for using the cluster CLI
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  1. Save the telegram-source-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the source by using the following command: 

    oc apply -f telegram-source-binding.yaml
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67.3.2.3. Procedure for using the Kamel CLI
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Configure and run the source by using the following command: 

kamel bind telegram-source -p "source.authorizationToken=The Token" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic
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This command creates the KameletBinding in the current namespace on the cluster.

67.4. Kamelet source file
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https://github.com/openshift-integration/kamelet-catalog/telegram-source.kamelet.yaml

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