How to send a message to Slack using curl from gitlab-ci.yml? - yaml

Question

I am using GitLab for a CI/CD process. I want to send messages to my channel in Slack. Following the API works from the terminal:
curl -X POST -H 'Content-type: application/json' --data '{"text":"Hello, World!"}' https://hooks.slack.com/services/xxx/yyyy/zzzz
However, when I put this line into my .yml file, it gives me a "yaml invalid error". Complete block is here:
slack_jar:
stage: slack
before_script:
- echo "hi there"
script:
- curl -F file=#target/springApp-0.0.1.jar -F channels=#application_dev_backend -F token='xoxb-1111-2222-yyyyyy' https://slack.com/api/files.upload
only:
- dev
slack_message:
stage: slack
script:
- echo "Send Slack Messages"
- curl -X POST -H 'Content-type: application/json' --data '{"text":"Hello, World!"}' https://hooks.slack.com/services/xxxx/yyyy/zzzz
only:
- dev
The first stage (sending file) is correct, but the second one is not working. This is the error message I get:
Status: syntax is incorrect Error: jobs:slack_message:script config should be a string or an array of strings

Answer 1

Based on your error message, the curl command in slack_message is incorrect. Try wrapping the entire command in quotes and escaping the internal quotes. The way you have it, the YAML parser thinks the Content-type: application/json is a key:value pair of a dictionary.
Try this instead:
slack_message:
stage: slack
script:
- echo "Send Slack Messages"
- "curl -X POST -H 'Content-type: application/json' --data '{\"text\":\"Hello, World!\"}' https://hooks.slack.com/services/xxxx/yyyy/zzzz"
only:
- dev
Pro Tip
You can use the CI Lint tool to validate the contents of gitlab-ci.yaml. You can access this in the CI/CD > Pipelines screen. See CI Lint.
There is also a useful website http://www.yamllint.com/ where you can input YAML, and it will (a) validate it, and (b) return a UTF-8 version. If you have string problems, the UTF-8 version will look mangled (which is what happens with your YAML).

Answer 2

Please give required privilege to bot User to post in channel.
follow the below ci.yaml
#please select the image which has curl command
slack_notification:
image: ubuntu:latest
script:
- echo "Get user id with curl from Slack"
- curl -X GET -H 'Authorization:Bearer <bot token>' https://slack.com/api/users.lookupByEmail?email=$GITLAB_USER_EMAIL | jq -r '.user.id'
# From the above if you change the | jq -r '.user.name' then you will get the name of the user from slack.
- echo "Slack post request"
- >
curl -X POST -H 'Authorization:Bearer <bot token>' -H 'Content-type: application/json' --data '{"channel":"<channel id which start CXXXX>","text":"Your job has been finished please validate Job Url '"$CI_PIPELINE_URL"'"}' https://slack.com/api/chat.postMessage
CI_PIPELINE_URL: This will give the job url.
Slack reference: https://api.slack.com/web