Public/Get-JiraIssueWatcher.ps1

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function Get-JiraIssueWatcher {
    <#
    .SYNOPSIS
       Returns watchers on an issue in JIRA.
    .DESCRIPTION
       This function obtains watchers from existing issues in JIRA.
    .EXAMPLE
       Get-JiraIssueWatcher -Key TEST-001
       This example returns all watchers posted to issue TEST-001.
    .EXAMPLE
       Get-JiraIssue TEST-002 | Get-JiraIssueWatcher
       This example illustrates use of the pipeline to return all watchers on issue TEST-002.
    .INPUTS
       This function can accept JiraPS.Issue objects, Strings, or Objects via the pipeline. It uses Get-JiraIssue to identify the issue parameter; see its Inputs section for details on how this function handles inputs.
    .OUTPUTS
       This function outputs all JiraPS.Watchers issues associated with the provided issue.
    .NOTES
       This function requires either the -Credential parameter to be passed or a persistent JIRA session. See New-JiraSession for more details. If neither are supplied, this function will run with anonymous access to JIRA.
    #>

    [CmdletBinding()]
    param(
        # JIRA issue to check for watchers. Can be a JiraPS.Issue object, issue key, or internal issue ID.
        [Parameter( Mandatory, ValueFromPipeline, ValueFromPipelineByPropertyName )]
        [ValidateNotNullOrEmpty()]
        [ValidateScript(
            {
                if (("JiraPS.Issue" -notin $_.PSObject.TypeNames) -and (($_ -isnot [String]))) {
                    $errorItem = [System.Management.Automation.ErrorRecord]::new(
                        ([System.ArgumentException]"Invalid Type for Parameter"),
                        'ParameterType.NotJiraIssue',
                        [System.Management.Automation.ErrorCategory]::InvalidArgument,
                        $_
                    )
                    $errorItem.ErrorDetails = "Wrong object type provided for Issue. Expected [JiraPS.Issue] or [String], but was $($_.GetType().Name)"
                    $PSCmdlet.ThrowTerminatingError($errorItem)
                    <#
                      #ToDo:CustomClass
                      Once we have custom classes, this check can be done with Type declaration
                    #>

                }
                else {
                    return $true
                }
            }
        )]
        [Alias('Key')]
        [Object]
        $Issue,

        # Credentials to use to connect to JIRA.
        # If not specified, this function will use anonymous access.
        [PSCredential]
        $Credential
    )

    begin {
        Write-Verbose "[$($MyInvocation.MyCommand.Name)] Function started"
    }

    process {
        Write-DebugMessage "[$($MyInvocation.MyCommand.Name)] ParameterSetName: $($PsCmdlet.ParameterSetName)"
        Write-DebugMessage "[$($MyInvocation.MyCommand.Name)] PSBoundParameters: $($PSBoundParameters | Out-String)"

        # Find the proper object for the Issue
        $issueObj = Resolve-JiraIssueObject -InputObject $Issue -Credential $Credential

        foreach ($issue in $issueObj) {
            $parameter = @{
                URI        = "{0}/watchers" -f $issue.RestURL
                Method     = "GET"
                Credential = $Credential
            }
            Write-Debug "[$($MyInvocation.MyCommand.Name)] Invoking JiraMethod with `$parameter"
            $result = Invoke-JiraMethod @parameter

            Write-Output $result.watchers
            # TODO: are these users?
        }
    }

    end {
        Write-Verbose "[$($MyInvocation.MyCommand.Name)] Complete"
    }
}