DSCResources/cFirefoxPolicy/cFirefoxPolicy.schema.psm1

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Configuration cFirefoxPolicy
{
    # help about Firefox Policy Engine
    # https://github.com/mozilla/policy-templates
    param
    (
        [Parameter(Mandatory = $false)]
        [ValidateSet('Ensure', 'Absent')]
        [string]
        $Ensure = 'Present',

        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [string]
        $PolicyName,

        [Parameter(Mandatory = $true)]
        [AllowEmptyString()]
        [string]
        $PolicyValue,

        [Parameter(Mandatory = $false)]
        [ValidateNotNullOrEmpty()]
        [string]
        $FirefoxDirectory = 'C:\Program Files\Mozilla Firefox'
    )

    Import-DscResource -ModuleName PSDesiredStateConfiguration
    Import-DscResource -ModuleName DSCR_FileContent

    $MozPolicyPath = Join-Path $FirefoxDirectory '\distribution\policies.json'

    $FormattedPolicyValue = & {
        if ([int]::TryParse($PolicyValue, [ref]$null)) {$PolicyValue}
        elseif ([bool]::TryParse($PolicyValue, [ref]$null)) {$PolicyValue.toLower()}
        elseif ($PolicyValue -ceq 'null') {$PolicyValue}
        else
        {
            try
            {
                ConvertFrom-Json -InputObject ($PolicyValue.Trim()) -ErrorAction Stop >$null
                $PolicyValue.Trim()
            }
            catch
            {
                $PolicyValue
            }
        }
    }

    Script Test_FirefoxDirectory
    {
        GetScript  = {
        }
        TestScript = {
            if (-not (Test-Path (Join-Path $using:FirefoxDirectory 'Firefox.exe') -PathType Leaf))
            {
                Write-Warning ('"FireFox.exe" does not exist in "{0}". Please confirm FirefoxDirectory' -f $using:FirefoxDirectory)
            }
            $true
        }
        SetScript  = {
        }
    }

    JsonFile FirefoxPolicy
    {
        Ensure = $Ensure
        Path   = $MozPolicyPath
        Key    = "policies/$PolicyName"
        Value  = $FormattedPolicyValue
    }
}