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.. _howto/connection:slack-incoming-webhook:

Slack Incoming Webhook Connection
=================================

The Slack Incoming Webhook connection type enables
`Slack Incoming Webhooks <https://api.slack.com/messaging/webhooks>`_ Integrations.

Authenticating to Slack
-----------------------

Authenticate to Slack using a `Incoming Webhook URL
<https://api.slack.com/messaging/webhooks#getting_started>`_.

Default Connection IDs
----------------------

.. warning::

  The :class:`airflow.providers.slack.hooks.slack_webhook.SlackWebhookHook` and community provided operators
  not intend to use any Slack Incoming Webhook Connection by default right now.
  It might change in the future to ``slack_default``.

Configuring the Connection
--------------------------

Schema
    Optional. Http schema, if not specified than **https** is used.

Slack Webhook Endpoint (Host)
    Optional. Reference to slack webhook endpoint, if not specified than **hooks.slack.com/services** is used.
    In case if endpoint contain schema, than value from field ``Schema`` ignores.

Webhook Token (Password)
    Specify the Slack Incoming Webhook URL. It might specified as full url like
    **https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX** in this case values
    from ``Slack Webhook Endpoint (Host)`` and ``Schema`` fields ignores.
    Or it might specified as URL path like **T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX** in this case
    Slack Incoming Webhook URL will build from this field, ``Schema`` and ``Slack Webhook Endpoint (Host)``.

Extra
    Specify the extra parameters (as json dictionary) that can be used in
    `slack_sdk.WebhookClient <https://slack.dev/python-slack-sdk/webhook/index.html>`_.
    All parameters are optional.

    * ``timeout``: The maximum number of seconds the client will wait to connect
      and receive a response from Slack Incoming Webhook.
    * ``proxy``: Proxy to make the Slack Incoming Webhook call.

If you are configuring the connection via a URI, ensure that all components of the URI are URL-encoded.

Examples
--------

**Snippet for create Connection as URI**:
  .. code-block:: python

    from airflow.models.connection import Connection

    conn = Connection(
        conn_id="slack_default",
        conn_type="slackwebhook",
        password="T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX",
        extra={
            # Specify extra parameters here
            "timeout": "42",
        },
    )

    # Generate Environment Variable Name
    env_key = f"AIRFLOW_CONN_{conn.conn_id.upper()}"
    print(f"{env_key}='{conn.get_uri()}'")

**Set Slack API Connection as Environment Variable (URI)**
  .. code-block:: bash

     export AIRFLOW_CONN_SLACK_DEFAULT='slackwebhook://:T00000000%2FB00000000%2FXXXXXXXXXXXXXXXXXXXXXXXX@/?timeout=42'