function Get-SiteTempDirectoryPath {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [Alias('SiteName')]
        [Alias('Site')]
        [Alias('Name')]
        [Alias('AppName')]
        [string]$SiteOrAppName
    )
    Start-Job -InputObject @{ SiteOrAppName = $SiteOrAppName; } -ScriptBlock {
        Import-Module WebAdministration
        $SiteOrAppName = $Input.SiteOrAppName
        $hashCode = @"
    public class HashCode
    {
        // https://stackoverflow.com/a/41575325/109749 ish
        public static string GetDirectoryName(string id, string appname, string path) {
            string v_app_name64b = HashCode.GetStringHashCode(("/LM/W3SVC/" + id + "/" + appname + path).ToLower(System.Globalization.CultureInfo.InvariantCulture)).ToString("x", System.Globalization.CultureInfo.InvariantCulture);
            return HashCode.GetString64(v_app_name64b).ToString("x8") + "\\" + v_app_name64b;
        }
        
        // System.Web.Util.StringUtil.GetStringHashCode() (System.Web.4.0.0.0) via System.Web.Hosting.ApplicationManager.CreateAppDomainWithHostingEnvironment(string appId, IApplicationHost appHost, HostingEnvironmentParameters hostingParameters) 
        internal unsafe static int GetStringHashCode(string s)
        {
            fixed(char* ptr = s){
                int num = 352654597;
                int num2 = num;
                int* ptr2 = (int*)ptr;
                for (int i = s.Length; i > 0; i -= 4)
                {
                    num = ((num << 5) + num + (num >> 27) ^ *ptr2);
                    if (i <= 2)
                    {
                        break;
                    }
                    num2 = ((num2 << 5) + num2 + (num2 >> 27) ^ ptr2[1]);
                    ptr2 += 2;
                }
                return num + num2 * 1566083941;
            }
        }
        
        // https://stackoverflow.com/a/41575325/109749
        internal static unsafe int GetString64(string s)
        {
            fixed (char* str = s)
            {
                int num3;
                char* chPtr = str;
                int num = 0x1505;
                int num2 = num;
                for (char* chPtr2 = chPtr; (num3 = chPtr2[0]) != '\0'; chPtr2 += 2)
                {
                    num = ((num << 5) + num) ^ num3;
                    num3 = chPtr2[1];
                    if (num3 == 0)
                    {
                        break;
                    }
                    num2 = ((num2 << 5) + num2) ^ num3;
                }
                return (num + (num2 * 0x5d588b65));
            }
        }
    }
"@;

        $cp = [System.CodeDom.Compiler.CompilerParameters]::new($assemblies);
        $cp.CompilerOptions = '/unsafe';
        Add-Type -TypeDefinition $hashCode -CompilerParameters $cp;

        $rootOrAppName = "root";
        $physicalPath = "";
        $siteId = "";

        $website = (Get-Website $siteOrAppName);
        if ($null -ne $website) {
            $physicalPath = $website.PhysicalPath.TrimEnd("\") + "\";
            $siteId = $website.id;
        } else {
            $appPool = (Get-WebApplication $siteOrAppName);
            if ($null -eq $appPool) {
                Write-Warning "could not match to any site or apppool. Did you provide the right information?"
                exit -1;
            }
            $sitename = $appPool.GetParentElement().attributes["name"].Value;
            $website = (Get-Website $sitename);
            if ($null -ne $website) {
                $physicalPath = $website.PhysicalPath.TrimEnd("\") + "\";
                $siteId = $website.id;
                $rootOrAppName = $siteOrAppName
            } else {
                Write-Warning "Could not find the site for $siteOrAppName";
                exit -1;
            }
        }

        $tempFilePath = "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\$rootOrAppName\" + [HashCode]::GetDirectoryName($siteid, $rootOrAppName, $physicalPath);
        return $tempFilePath
    } | Receive-Job -Wait -AutoRemoveJob
}