Mark Payne created NIFI-12331:
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Summary: Introduce a PublishSlack processor
Key: NIFI-12331
URL: https://issues.apache.org/jira/browse/NIFI-12331
Project: Apache NiFi
Issue Type: New Feature
Components: Extensions
Reporter: Mark Payne
The Slack API provides multiple different ways to publish messages to a Slack
channel. NiFi already has two Processors for pushing to Slack - PostSlack and
PutSlack. These processors have slightly different nuances, and the
documentation does not articulate when to which one. One of them is oriented
more toward sending FlowFile contents as an attachment while the other is
oriented toward posting a message based on a property value. We should
consolidate both of these Processors into a single Processor that is capable of
sending a message and optionally providing the FlowFile content as an
attachment.
Both PostSlack and PutSlack make use of WebHooks instead of using the official
Slack SDK. This means that rather than simply specifying the name of the
Channel to post to, in order to send a message in Slack, the creator of the
Slack App must explicitly add a Webhook for the desired channel, and the
Processor must then be configured to use that Webhook. As a result, the channel
cannot be easily configured and cannot be dynamic. This makes it difficult to
use in conjunction with ListenSlack / ConsumeSlack in order to respond in
threads.
We need to consolidate both into a single Processor that is configured and
behaves differently, based on the SDK.
This Processor should be configured with properties that allow specifying:
* Bot Token
* Name of the channel to send to
* How to obtain the message content (FlowFile Content or specified as a
Property that accepts Expression Language)
* If using a Property value, should be configured also with the message to
send, and whether or not to attach the FlowFile content as an attachment to the
message.
* Thread Timestamp (optional to convey which thread the message should be sent
to) - should support Expression Language
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