Slack plugin for Jenkins

Provides Jenkins notification integration with Slack or Slack compatible applications like RocketChat and Mattermost.

Install Instructions for Slack

1. Get a Slack account: https://slack.com/

2. Install this plugin on your Jenkins server:

   1. From the Jenkins homepage navigate to Manage Jenkins
   2. Navigate to Manage Plugins,
   3. Change the tab to Available,
   4. Search for slack,
   5. Check the box next to install.

3. Continue to the next section to create your Slack app.

Creating your app

1. Go to https://api.slack.com/apps and click "Create New App".
2. Click From an app manifest
3. Select your workspace
4. Delete the example manifest that Slack provides
5. Click YAML
6. Paste the following into the text box:

display_information:
  name: Jenkins
features:
  bot_user:
    display_name: Jenkins
    always_online: true
oauth_config:
  scopes:
    bot:
      - channels:read
      - chat:write
      - chat:write.customize
      - files:write
      - reactions:write
      - users:read
      - users:read.email
      - groups:read
settings:
  org_deploy_enabled: false
  socket_mode_enabled: false
  token_rotation_enabled: false

7. Click "Next"
8. Click "Create"
9. Click "Install App to Workspace"
10. Click "Allow"
11. Click "OAuth & Permissions" in the sidebar
12. Copy the "Bot User OAuth Access Token"
13. On Jenkins: Find the Slack configuration in "Manage Jenkins → System".
    1. On Jenkins: Click "Add" to create a new "Secret text" Credential with the bot user token.
    2. On Jenkins: Select the new "Secret text" in the dropdown.
    3. On Jenkins: Add a default channel (this can be removed after validating the connection works).
    4. On Jenkins: Tick the "Custom slack app bot user" option.
14. Invite the Jenkins bot user into the Slack channel(s) you wish to be notified in.
15. On Jenkins: Click test connection. A message will be sent to the default channel / default member.

Notify for all jobs

If you want to configure a notification to be sent to Slack for all jobs, you may want to also consider installing an additional plugin called Global Slack Notifier plugin.

Pipeline job

slackSend color: "good", message: "Message from Jenkins Pipeline"

Additionally you can pass attachments or blocks (requires bot user) in order to send complex messages, for example:

Attachments:

def attachments = [
  [
    text: 'I find your lack of faith disturbing!',
    fallback: 'Hey, Vader seems to be mad at you.',
    color: '#ff0000'
  ]
]

slackSend(channel: "#general", attachments: attachments)

Blocks (this feature requires a 'bot user' and a custom slack app):

blocks = [
    [
        "type": "section",
        "text": [
            "type": "mrkdwn",
            "text": "Hello, Assistant to the Regional Manager Dwight! *Michael Scott* wants to know where you'd like to take the Paper Company investors to dinner tonight.\n\n *Please select a restaurant:*"
        ]
    ],
    [
        "type": "divider"
    ],
    [
        "type": "section",
        "text": [
            "type": "mrkdwn",
            "text": "*Farmhouse Thai Cuisine*\n:star::star::star::star: 1528 reviews\n They do have some vegan options, like the roti and curry, plus they have a ton of salad stuff and noodles can be ordered without meat!! They have something for everyone here"
        ],
        "accessory": [
            "type": "image",
            "image_url": "https://s3-media3.fl.yelpcdn.com/bphoto/c7ed05m9lC2EmA3Aruue7A/o.jpg",
            "alt_text": "alt text for image"
        ]
    ]
]

slackSend(channel: "#general", blocks: blocks)

For more information about slack messages see Slack Messages Api, Slack attachments Api and Block kit

Note: the attachments API is classified as legacy, with blocks as the replacement (but blocks are only supported when using a bot user through a custom slack app).

File upload

You can upload files to slack with this plugin:

node {
  sh "echo hey > blah.txt"
  slackUploadFile filePath: "*.txt", initialComment:  "HEY HEY"
}

This feature requires botUser mode.

File upload to a user channel

You can upload files to a user channel by messaging the user first and then using the channel ID from the message response:

node {
  sh "echo hey > blah.txt"
  def slackResponse = slackSend channel: '$userId', message: 'Hey', sendAsText: true
  slackUploadFile filePath: "*.txt", channel: slackResponse.channelId
}

Threads Support

You can send a message and create a thread on that message using the pipeline step. The step returns an object which you can use to retrieve the thread ID. Send new messages with that thread ID as the target channel to create a thread. All messages of a thread should use the same thread ID.

Example:

def slackResponse = slackSend(channel: "cool-threads", message: "Here is the primary message")
slackSend(channel: slackResponse.threadId, message: "Thread reply #1")
slackSend(channel: slackResponse.threadId, message: "Thread reply #2")

This feature requires botUser mode.

Messages that are posted to a thread can also optionally be broadcasted to the channel. Set replyBroadcast: true to do so. For example:

def slackResponse = slackSend(channel: "ci", message: "Started build")
slackSend(channel: slackResponse.threadId, message: "Build still in progress")
slackSend(
    channel: slackResponse.threadId,
    replyBroadcast: true,
    message: "Build failed. Broadcast to channel for better visibility."
)

If you wish to upload a file to a thread, you can do so by specifying the channel, and the timestamp of the thread you want to add the file to, separated by a colon. For example:

def slackResponse = slackSend(channel: "cool-threads", message: "Here is the primary message")
sh "echo hey > blah.txt"
slackUploadFile(channel: "cool-threads:" + slackResponse.ts, filePath: "*.txt", initialComment:  "A file, inside a thread.")

Update Messages

You can update the content of a previously sent message using the pipeline step. The step returns an object which you can use to retrieve the timestamp and channelId NOTE: The slack API requires the channel ID for chat.update calls.

Example:

def slackResponse = slackSend(channel: "updating-stuff", message: "Here is the primary message")
slackSend(channel: slackResponse.channelId, message: "Update message now", timestamp: slackResponse.ts)

This feature requires botUser mode.

Emoji Reactions

Add an emoji reaction to a previously-sent message like this:

Example:

def slackResponse = slackSend(channel: "emoji-demo", message: "Here is the primary message")
slackResponse.addReaction("thumbsup")

You can remove an emoji reaction to a previously-sent message like this:

Example:

def slackResponse = slackSend(channel: "emoji-demo", message: "Here is the primary message")
slackResponse.addReaction("thumbsup")
// ... do some stuff
slackResponse.removeReaction("thumbsup")

This may only work reliably in channels (as opposed to private messages) due to limitations in the Slack API (See "Post to an IM channel").

This does not currently work in a situation where Jenkins is restarted between sending the initial message and adding the reaction. If this is something you need, please file an issue.

This feature requires botUser mode and the reactions:write API scope.

Unfurling Links

You can allow link unfurling if you send the message as text. This only works in a text message, as attachments cannot be unfurled.

Example:

slackSend(channel: "news-update", message: "https://www.nytimes.com", sendAsText: true)

User Id Look Up

There are two pipeline steps available to help with user id look up.

A user id can be resolved from a user's email address with the slackUserIdFromEmail step.

Example:

def userId = slackUserIdFromEmail('spengler@ghostbusters.example.com')
slackSend(color: "good", message: "<@$userId> Message from Jenkins Pipeline")

A list of user ids can be resolved against the set of changeset commit authors with the slackUserIdsFromCommitters step.

Example:

def userIds = slackUserIdsFromCommitters()
def userIdsString = userIds.collect { "<@$it>" }.join(' ')
slackSend(color: "good", message: "$userIdsString Message from Jenkins Pipeline")

This feature requires botUser mode and the users:read and users:read.email API scopes.

Colors

Warning: This functionality is not supported if you are using the blocks layout mode

Any hex triplet (i.e. '#AA1100') can be used for the color of the message. There are also three builtin color options:

Freestyle job

1. Configure it in your Jenkins job (and optionally as global configuration) and add it as a Post-build action.

Security

Use Jenkins Credentials and a credential ID to configure the Slack integration token. It is a security risk to expose your integration token using the previous Integration Token setting.

Create a new Secret text credential:

Select that credential as the value for the Credential field:

Direct Message

You can send messages to channels or you can notify individual users via their slackbot. In order to notify an individual user, use the syntax @user_id in place of the project channel. Mentioning users by display name may work, but it is not unique and will not work if it is an ambiguous match.

User Mentions

Use the syntax <@user_id> in a message to mention users directly. See User Id Look Up for pipeline steps to help with user id look up.

Configuration as code

This plugin supports configuration as code Add to your yaml file:

credentials:
  system:
    domainCredentials:
      - credentials:
          - string:
              scope: GLOBAL
              id: slack-token
              secret: '${SLACK_TOKEN}'
              description: Slack token

unclassified:
  slackNotifier:
    teamDomain: <your-slack-workspace-name> # i.e. your-company (just the workspace name not the full url)
    tokenCredentialId: slack-token
    botUser: true

For more details see the configuration as code plugin documentation: https://github.com/jenkinsci/configuration-as-code-plugin#getting-started

Troubleshooting connection failure

When testing the connection, you may see errors like:

    WARNING j.p.slack.StandardSlackService#publish: Response Code: 404

There's a couple of things to try:

Have you enabled bot user mode?

If you've ticked Custom slack app bot user then try unticking it, that mode is for when you've created a custom app and installed it to your workspace instead of the default Jenkins app made by Slack

Have you set the override URL?

If you've entered something into Override url then try clearing it out, that field is only needed for slack compatible apps like mattermost.

Enable additional logging

Add a log recorder for the StandardSlackService class this should give you additional details on what's going on.

If you still can't figure it out please raise an issue with as much information as possible about your config and any relevant logs.

Developer instructions

Install Maven and JDK.

$ mvn -version | grep -v home
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T08:41:47-08:00)
Java version: 1.7.0_79, vendor: Oracle Corporation
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "4.4.0-65-generic", arch: "amd64", family: "unix"

Run unit tests

mvn test

Create an HPI file to install in Jenkins (HPI file will be in target/slack.hpi).

mvn clean package