Simple Service Now Change Control Validator

ado-servicenow-validate.yml

parameters:
- name: changeControlNumber
  type: string
  displayName: Change Control Number
  default: 'CHG000000'
- name: serviceNowUri
  type: string
  displayName: Service Now Base Uri
  default: https://service-now-tenant.service-now.com
- name: serviceNowUser
  type: string
- name: serviceNowPassword
  type: string
- name: requiresAllActive
  type: boolean
  default: true

steps:
- powershell: |
    Get-ChildItem env:
    $url = "$($env:SYSTEM_TEAMFOUNDATIONSERVERURI)$env:SYSTEM_TEAMPROJECTID/_apis/git/repositories/$($env:BUILD_REPOSITORY_NAME)/pullRequests/$($env:SYSTEM_PULLREQUEST_PULLREQUESTID)/labels?api-version=5.1-preview.1"
    $response = Invoke-RestMethod -Uri $url -Method Get -Headers @{
        Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"
    }
    $val = $response.value.name -split ",\s*" | Where-Object { $_.StartsWith("CHG") } | ConvertTo-Json -Compress
    Write-Host "##vso[task.setvariable variable=PullRequestTags;isOutput=true]$val"
  displayName: Scan for PR Tags
  name: PR

- powershell: |
    try {
      $url = '${{ parameters.serviceNowUri }}'
      $combined = '${{ parameters.serviceNowUser }}' + ':' + '${{ parameters.serviceNowPassword }}'
      $bytes = [System.Text.Encoding]::UTF8.GetBytes($combined)
      $b64creds = [System.Convert]::ToBase64String($bytes)

      $headers = @{
          "Authorization" = "Basic $b64creds"
          "Accept" = "application/json"
      }

      $changeControlNumbers = '$(PR.PullRequestTags)' | ConvertFrom-Json
      if ($changeControlNumbers.length -eq 0) {
          $changeControlNumbers = '["${{ parameters.changeControlNumber }}"]' | ConvertFrom-Json
      }

      $requiresAllActive = '${{ parameters.requiresAllActive }}'
      $notActive = New-Object System.Collections.ArrayList($null)
      $areActive = New-Object System.Collections.ArrayList($null)

      foreach ($changeNum in $changeControlNumbers) {
          $response = Invoke-RestMethod "$url/api/sn_chg_rest/change?sysparm_query=number=$changeNum" -Headers $headers
          $active_cc = @($response.result | Where-Object { $_.active.value -eq $true })
          if ($active_cc.length -gt 0) 
          {
            $areActive.Add($changeNum)
          } else {
            $notActive.Add($changeNum)
          }
      }

      if ($requiresAllActive -eq $true) {
          if ($areActive.length -ne $changeControlNumbers.length) {
              Write-Host "##vso[task.logissue type=error;] The following change controls are not active: $notActive"
              exit 1
          }
          else {
              Write-Host "All change controls provided are active ($areActive)."
              exit 0
          }
      }
      else {
          if ($areActive.length -gt 0) {
              Write-Host "At least one Change Control is active ($areActive)"
              exit 0
          }
          else {
            Write-Host "##vso[task.logissue type=error;] The following change controls are not active: $notActive"
            exit 1
          }
      }
    } catch {
      Write-Host "##vso[task.logissue type=error;] $_"
      exit 1
    }
  displayName: Validate Change Control