Public/Get-JiraIssueAttachment.ps1

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function Get-JiraIssueAttachment {
    # .ExternalHelp ..\JiraPS-help.xml
    [CmdletBinding()]
    param(
        [Parameter( Mandatory, ValueFromPipeline, ValueFromPipelineByPropertyName )]
        [ValidateNotNullOrEmpty()]
        [ValidateScript(
            {
                if (("JiraPS.Issue" -notin $_.PSObject.TypeNames) -and (($_ -isnot [String]))) {
                    $exception = ([System.ArgumentException]"Invalid Type for Parameter") #fix code highlighting]
                    $errorId = 'ParameterType.NotJiraIssue'
                    $errorCategory = [System.Management.Automation.ErrorCategory]::InvalidArgument
                    $errorTarget = $_
                    $errorItem = New-Object -TypeName System.Management.Automation.ErrorRecord $exception, $errorId, $errorCategory, $errorTarget
                    $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,

        [String]
        $FileName,

        [Parameter()]
        [System.Management.Automation.PSCredential]
        [System.Management.Automation.Credential()]
        $Credential = [System.Management.Automation.PSCredential]::Empty
    )

    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

        if ($issueObj.Attachment) {
            Write-Debug "[$($MyInvocation.MyCommand.Name)] Found Attachments on the Issue."
            if ($FileName) {
                $attachments = $issueObj.Attachment | Where-Object {$_.Filename -like $FileName}
            }
            else {
                $attachments = $issueObj.Attachment
            }

            ConvertTo-JiraAttachment -InputObject $attachments
        }
        else {
            $errorMessage = @{
                Category         = "ObjectNotFound"
                CategoryActivity = "Searching for resource"
                Message          = "This issue does not have any attachments"
            }
            Write-Error @errorMessage
        }
    }

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