functions/Get-SL1Appliance.ps1

Function Get-SL1Appliance {
    [CmdletBinding(DefaultParameterSetName='Filter')]
    Param(
        [Parameter(Position=0, ValueFromPipeline, ParameterSetName='ID')]
        [ValidateScript({$_ -gt 0})]
        [int64]$Id,

        [Parameter(Position=0, ValueFromPipeline, ParameterSetName='Filter')]
        [string]$Filter,

        [Parameter(Position=1)]
        [ValidateRange(0,([int64]::MaxValue))]
        [int64]$Limit
    )

    Begin {
        Assert-SL1Connected
        if ($Limit -eq 0) {
            $Limit = $Script:SL1Defaults.DefaultLimit
        }
    }

    Process {
        switch ($PSCmdlet.ParameterSetName) {
            'ID' {
                if ($id) {
                    $SL1Appliance = Invoke-SL1Request GET "$($Script:SL1Defaults.APIROOT)/api/appliance/$($Id)"
                    switch ($SL1Appliance.StatusCode) {
                        { $_ -eq [system.net.httpstatuscode]::OK } {
                            $Appliance = ConvertFrom-Json $SL1Appliance.content
                            ConvertTo-Appliance -SL1Appliance $Appliance -ID $Id
                        }
                        { $_ -eq [system.net.httpstatuscode]::Forbidden } { throw "You are not authorized to getappliance information"}
                        { $_ -eq [System.Net.HttpStatusCode]::NotFound } { throw "Device group with id $($Id) is not found in the SL1 system" }
                    }
                } else {
                    Get-SL1Appliance -Filter 'filter.0.name.contains=bru-in-sclo'
                }
            }
            'Filter' {
                if ($filter -ne "") {
                    $SL1Appliance = Invoke-SL1Request Get "$($Script:SL1Defaults.APIROOT)/api/appliance?$($Filter)&limit=$($Limit)"
                } else {
                    $SL1Appliance = Invoke-SL1Request Get "$($Script:SL1Defaults.APIRoot)/api/appliance?limit=$($Limit)"
                }
                switch ($SL1Appliance.StatusCode) {
                    { $_ -eq [system.net.httpstatuscode]::OK} {
                        $Json = ConvertFrom-Json $SL1Appliance.content
                        if ($Json.total_matched -eq 0) {
                            throw "No device group found with filter '$($Filter)'"
                        } else {
                            $Appliances = ConvertFrom-Json ((Invoke-SL1Request Get "$($Script:SL1Defaults.APIROOT)/api/appliance?$($Filter)&limit=$($Limit)&hide_filterinfo=1&extended_fetch=1").Content)
                            foreach ($ApplianceURI in (($Appliances | Get-Member -MemberType NoteProperty).name) ) {
                                ConvertTo-Appliance -SL1Appliance $Appliances.$ApplianceURI -ID "$( ($ApplianceURI -split '/')[-1])"
                            }
                        }
                    }
                    { $_ -eq [system.net.httpstatuscode]::Forbidden }  { throw "You are not authorized to get information on device groups"}
                    { $_ -eq [System.Net.HttpStatusCode]::NotFound } { throw "Device group with id $($Id) is not found in the SL1 system" }
                }
            }
        }
    }
}