Add Random Reviewers to Pull Request from Group

Overview

Add Random Reviewers to Pull Request from Group.

Example

As a tech leader, I want to add random reviewers to pull requests from my development team group in order to improve the way of sharing the pull request review between the team members. The reviewers should be added after the pull request has been created.

Good to Know

This script must be configured as a Custom listener for the PullRequestOpenedEvent event by someone with at least global administrator permission.
Use the GROUP_NAME string to set the group name that will be used get the reviewers.
Use the PROJECT_KEY and REPOSITORY_NAME strings to specify the project and repository that this script will be executed.
Use the NUMBER_OF_USERS integer to set how many reviewers from the group should be added to the pull request.

import com.atlassian.bitbucket.pull.PullRequestService
import com.atlassian.bitbucket.user.UserService
import com.atlassian.bitbucket.user.ApplicationUser
import com.atlassian.bitbucket.util.PageUtils
import com.atlassian.sal.api.component.ComponentLocator

def final GROUP_NAME = 'dev-reviewer-group'
def final PROJECT_KEY = 'LIBRARY'
def final REPOSITORY_NAME = 'scripts-repository'
def final NUMBER_OF_USERS = 2
def final PAGE_SIZE = 1000

def pullRequestService = ComponentLocator.getComponent(PullRequestService)
def userService = ComponentLocator.getComponent(UserService)
def pullRequest = event.pullRequest

if (pullRequest.toRef.repository.project.key != PROJECT_KEY || pullRequest.toRef.repository.name != REPOSITORY_NAME) {
    return
}

def usersFromGroup = PageUtils.toStream({ pageRequest ->
    userService.findUsersByGroup(GROUP_NAME, pageRequest)
}, PAGE_SIZE).collect { it as ApplicationUser }

def randomUsersFromGroup = getRandomUsersFromGroup(usersFromGroup, NUMBER_OF_USERS, pullRequest.author.user)

randomUsersFromGroup.each { user ->
    pullRequestService.addReviewer(pullRequest.toRef.repository.id, pullRequest.id, user.name)
}

Set<ApplicationUser> getRandomUsersFromGroup (List<ApplicationUser> users, int numberOfUsers, ApplicationUser prUserAuthor) {
    def randomUsers = [] as Set<ApplicationUser>

    while (randomUsers.size() < numberOfUsers) {
        Collections.shuffle(users)

        // The PR Author can't be reviewer and to avoid the user being duplicated
        if (prUserAuthor != users.first() && !randomUsers.contains(users.first())) {
            randomUsers << users.first()
        }
    }

    randomUsers
}