Public/Get-JiraProject.ps1

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function Get-JiraProject {
    # .ExternalHelp ..\JiraPS-help.xml
    [CmdletBinding( DefaultParameterSetName = '_All' )]
    param(
        [Parameter( Position = 0, Mandatory, ValueFromPipeline, ParameterSetName = '_Search' )]
        [String[]]
        $Project,

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

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

        $server = Get-JiraConfigServer -ErrorAction Stop

        $resourceURi = "$server/rest/api/latest/project{0}?expand=description,lead,issueTypes,url,projectKeys"
    }

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

        switch ($PSCmdlet.ParameterSetName) {
            '_All' {
                $parameter = @{
                    URI        = $resourceURi -f ""
                    Method     = "GET"
                    Credential = $Credential
                }
                Write-Debug "[$($MyInvocation.MyCommand.Name)] Invoking JiraMethod with `$parameter"
                $result = Invoke-JiraMethod @parameter

                Write-Output (ConvertTo-JiraProject -InputObject $result)
            }
            '_Search' {
                foreach ($_project in $Project) {
                    Write-Verbose "[$($MyInvocation.MyCommand.Name)] Processing [$_project]"
                    Write-Debug "[$($MyInvocation.MyCommand.Name)] Processing `$_project [$_project]"

                    $parameter = @{
                        URI        = $resourceURi -f "/$($_project)"
                        Method     = "GET"
                        Credential = $Credential
                    }
                    Write-Debug "[$($MyInvocation.MyCommand.Name)] Invoking JiraMethod with `$parameter"
                    $result = Invoke-JiraMethod @parameter

                    Write-Output (ConvertTo-JiraProject -InputObject $result)
                }
            }
        }
    }

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