internal/functions/resolve/Resolve-Agreement.ps1

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function Resolve-Agreement
{
    [CmdletBinding()]
    Param (
        [Parameter(Mandatory = $true)]
        [string] $InputReference,
        [switch] $DontFailIfNotExisting,
        [System.Management.Automation.PSCmdlet]
        $Cmdlet = $PSCmdlet
    )
    
    begin {
        $InputReference = Resolve-String -Text $InputReference
    }
    process
    {            
        try {
            if ($InputReference -match $script:guidRegex) {
                $agreement = (Invoke-MgGraphRequest -Method GET -Uri ("$script:graphBaseUrl/agreements/{0}" -f $InputReference)).Value
            }
            else {
                $agreement = (Invoke-MgGraphRequest -Method GET -Uri ("$script:graphBaseUrl/agreements/?`$filter=displayName eq '{0}'" -f $InputReference)).Value
            }

            if (-Not $agreement -and -Not $DontFailIfNotExisting) { throw "Cannot find agreement $InputReference" } 
            elseif (-Not $location -and $DontFailIfNotExisting) { return }

            if ($agreement.count -gt 1) { throw "Got multiple agreements for $InputReference" }
            return $agreement.Id
        }
        catch {
            Write-PSFMessage -Level Warning -String 'TMF.CannotResolveResource' -StringValues "Agreement" -Tag 'failed' -ErrorRecord $_
            $Cmdlet.ThrowTerminatingError($_)                
        }            
    }
}