Functions/Public/Get-AMProcess.ps1

function Get-AMProcess {
    <#
        .SYNOPSIS
            Gets Automate processes.

        .DESCRIPTION
            Get-AMProccess gets process objects from Automate. Get-AMProcess can receive items on the pipeline and return related objects.

        .PARAMETER InputObject
            The object(s) to use in search for processes.

        .PARAMETER Name
            The name of the process (case sensitive). Wildcard characters can be escaped using the ` character. If using escaped wildcards, the string
            must be wrapped in single quotes. For example: Get-AMProcess -Name '`[Test`]'

        .PARAMETER ID
            The ID of the process.

        .PARAMETER FilterSet
            The parameters to filter the search on. Supply hashtable(s) with the following properties: Property, Operator, Value.
            Valid values for the Operator are: =, !=, <, >, contains (default - no need to supply Operator when using 'contains')

        .PARAMETER FilterSetMode
            If multiple filter sets are provided, FilterSetMode determines if the filter sets should be evaluated with an AND or an OR

        .PARAMETER SortProperty
            The object property to sort results on. Do not use ConnectionAlias, since it is a custom property added by this module, and not exposed in the API.

        .PARAMETER SortDescending
            If specified, this will sort the output on the specified SortProperty in descending order. Otherwise, ascending order is assumed.

        .PARAMETER Connection
            The Automate management server.

        .INPUTS
            Processes related to the following objects can be retrieved by this function:
            Workflow
            Folder

        .OUTPUTS
            Process

        .EXAMPLE
            # Get process "My Process"
            Get-AMProcess "My Process"

        .EXAMPLE
            # Get processes in folder "My Folder"
            Get-AMFolder "My Folder" | Get-AMProcess

        .EXAMPLE
            # Get processes in workflow "My Workflow"
            Get-AMWorkflow "My Workflow" | Get-AMProcess

        .EXAMPLE
            # Get processes using filter sets
            Get-AMProcess -FilterSet @{ Property = "Name"; Operator = "contains"; Value = "CMD"},@{ Property = "Enabled"; Operator = "="; Value = "false"}

        .LINK
            https://github.com/AutomatePS/AutomatePS/blob/master/Docs/Get-AMProcess.md
    #>

    [CmdletBinding(DefaultParameterSetName="All")]
    [OutputType([AMProcessv10],[AMProcessv11])]
    param (
        [Parameter(ValueFromPipeline = $true, ParameterSetName = "ByPipeline")]
        [ValidateNotNullOrEmpty()]
        $InputObject,

        [Parameter(Position = 0)]
        [ValidateNotNullOrEmpty()]
        [string]$Name,

        [Parameter(ParameterSetName = "ByID")]
        [ValidateNotNullOrEmpty()]
        [string]$ID,

        [ValidateNotNull()]
        [Hashtable[]]$FilterSet = @(),

        [ValidateSet("And","Or")]
        [string]$FilterSetMode = "And",

        [ValidateNotNullOrEmpty()]
        [string[]]$SortProperty = "Name",

        [ValidateNotNullOrEmpty()]
        [switch]$SortDescending = $false,

        [ValidateNotNullOrEmpty()]
        [ArgumentCompleter([AMConnectionCompleter])]
        $Connection
    )

    BEGIN {
        # If the server is specified, or only 1 server is connected, don't show it. Otherwise, show the server.
        if ($PSCmdlet.ParameterSetName -eq "ByID" -and (-not $PSBoundParameters.ContainsKey("Connection")) -and ((Get-AMConnection).Count -gt 1)) {
            throw "When searching by ID: 1) Connection must be specified, OR 2) only one server can be connected."
        }
        $splat = @{
            RestMethod = "Get"
        }
        if ($PSBoundParameters.ContainsKey("Connection")) {
            $Connection = Get-AMConnection -Connection $Connection
            $splat.Add("Connection",$Connection)
        }
        $result = @()
        $processCache = @{}
        if ($PSBoundParameters.ContainsKey("Name") -and (-not [System.Management.Automation.WildcardPattern]::ContainsWildcardCharacters($Name))) {
            $FilterSet += @{Property = "Name"; Operator = "="; Value = [System.Management.Automation.WildcardPattern]::Unescape($Name)}
        } elseif ($PSBoundParameters.ContainsKey("Name") -and [System.Management.Automation.WildcardPattern]::ContainsWildcardCharacters($Name)) {
            try   { "" -like $Name | Out-Null } # Test wildcard string
            catch { throw }                     # Throw error if wildcard invalid
            $splat += @{ FilterScript = {$_.Name -like $Name} }
        }
    }

    PROCESS {
        switch($PSCmdlet.ParameterSetName) {
            "All" {
                $splat += @{ Resource = Format-AMUri -Path "processes/list" -FilterSet $FilterSet -FilterSetMode $FilterSetMode -SortProperty $SortProperty -SortDescending:$SortDescending.ToBool() }
                $result = Invoke-AMRestMethod @splat
            }
            "ByID" {
                $splat += @{ Resource = "processes/$ID/get" }
                $result = Invoke-AMRestMethod @splat
            }
            "ByPipeline" {
                foreach ($obj in $InputObject) {
                    $tempSplat = $splat
                    if (-not $tempSplat.ContainsKey("Connection")) {
                        $tempSplat += @{ Connection = $obj.ConnectionAlias }
                    } else {
                        $tempSplat["Connection"] = $obj.ConnectionAlias
                    }
                    if (-not $processCache.ContainsKey($obj.ConnectionAlias)) {
                        Write-Verbose "Caching process objects for server $($obj.ConnectionAlias) for better performance"
                        $processCache.Add($obj.ConnectionAlias, (Get-AMProcess -FilterSet $FilterSet -FilterSetMode $FilterSetMode -SortProperty $SortProperty -SortDescending:$SortDescending.ToBool() -Connection $obj.ConnectionAlias))
                    }
                    Write-Verbose "Processing $($obj.Type) '$($obj.Name)'"
                    switch ($obj.Type) {
                        "Workflow" {
                            # Get tasks contained within the provided workflow(s)
                            foreach ($item in $obj.Items) {
                                switch ($item.ConstructType) {
                                    "Process" {
                                        if ($item.ConstructID -ne "") {
                                            $result += $processCache[$obj.ConnectionAlias] | Where-Object {$_.ID -eq $item.ConstructID}
                                        } else {
                                            Write-Warning "Workflow '$($obj.Name)' contains an unbuilt process!"
                                        }
                                    }
                                }
                            }
                        }
                        "Folder" {
                            # Get tasks contained within the provided folder(s)
                            $result += $processCache[$obj.ConnectionAlias] | Where-Object {$_.ParentID -eq $obj.ID}
                        }
                        default {
                            $unsupportedType = $obj.GetType().FullName
                            if ($_) {
                                $unsupportedType = $_
                            } elseif (-not [string]::IsNullOrEmpty($obj.Type)) {
                                $unsupportedType = $obj.Type
                            }
                            Write-Error -Message "Unsupported input type '$unsupportedType' encountered!" -TargetObject $obj
                        }
                    }
                }
            }
        }
    }

    END {
        # Workaround for bug 23382 - processes/list doesn't return the EnvironmentVariables property, bug processes/{id}/get does
        $finalResult = @()
        foreach ($r in $result) {
            $finalResult += Invoke-AMRestMethod -Resource "processes/$($r.ID)/get" -Connection $r.ConnectionAlias
        }
        # End workaround

        $SortProperty += "ConnectionAlias", "ID"
        return $finalResult | Sort-Object $SortProperty -Unique -Descending:$SortDescending.ToBool()
    }
}