slack: A Makefile repository from micklove

SimpleSlackWebhookClient

Simple slack webhook client, built in java. (Using no external libs)

Using json template, created on https://app.slack.com/block-kit-builder (details below)

Github Actions build

Branches

main branch uses jdk 11
java18 branch for jdk 1.8

Help

make help

Required ENV Properties

The app expects the following properties to be loaded from the Env

export SLACK_WEBHOOK_URL='SLACK_WEBHOOK_URL=https://hooks.slack.com/services/SOMEVALUE/SOMEOTHERVALUE/SOMETOKENLOOKINGVALUE'
export SLACK_MESSAGE_ICON='https://avatars2.githubusercontent.com/u/459687?s=200&v=4'

Running from the command line: (if built locally, by Maven. If not, adapt to suit)

SLACK_WEBHOOK_URL=https://hooks.slack.com/services/SOMEVALUE/SOMEOTHERVALUE/SOMETOKENLOOKINGVALUE \
   SLACK_MESSAGE_ICON="https://avatars2.githubusercontent.com/u/459687?s=200&v=4" \
      java -cp target/classes \
        SimpleSlackWebhookClient \
        "Talend" \
        "Load data from Member preferences" \
        "Failure" \
        "Job complete"

Run, using make (which uses mvn exec. nb: Ensure env vars are exported ,see above)

make run

# Using overridden values
make run TITLE="BLAH" SUMMARY="my-summary" MSG_TEXT="Hello-World" STATUS="failure"

Message template

A very basic json message template is used to create the slack json message structure, using the Slack Block Kit Builder

To use, simply paste the contents of slack-message.json into the Slack Block Kit Builder, modify to suit and replace the local copy.

Other

jenv was used locally to set the required jdk version, 1.8.0.242. See .java-version

References

nb: There is a Slack SDK for Java, however, my requirement was to build this without the need to use external libraries.

micklove/slack