public/Set-SpeedTestConfig.ps1

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<#
    .SYNOPSIS
    Set the default server configurations for Internet and Local speed test servers.

    .DESCRIPTION
    Set the default server configurations for Internet and Local speed test servers.
    Convert parameter values to appropriate PSCustomObject and write to the JSON configuration file.

    .PARAMETER InternetServer
    The server that will be utilized when running "Invoke-SpeedTest -Internet".

    .PARAMETER InternetPort
    The port that will be utilized when running "Invoke-SpeedTest -Internet".

    .PARAMETER LocalServer
    The server that will be utilized when running "Invoke-SpeedTest -Local".

    .PARAMETER LocalPort
    The port that will be utilized when running "Invoke-SpeedTest -Local".

    .EXAMPLE
    Set-SpeedTestConfig -InternetServer "test.public.com" -InternetPort "5201"
    Sets the default Internet speed test server to "test.public.com" on port "5201".

    .EXAMPLE
    Set-SpeedTestConfig -InternetServer "test.public.com"
    Sets the default Internet speed test server to "test.public.com".
    When running a speed test, the last saved Internet port will be utilized, or the default port "5201".

    .EXAMPLE
    Set-SpeedTestConfig -InternetPort "5201"
    Sets the default Internet speed test port to "5201".
    Requires a previously-saved Internet speed test server.

    .EXAMPLE
    Set-SpeedTestConfig -LocalServer "test.local.com" -LocalPort "5201"
    Sets the default Local speed test server to "test.local.com" on port "5201".

    .EXAMPLE
    Set-SpeedTestConfig -LocalServer "test.local.com"
    Sets the default Local speed test server to "test.local.com".
    When running a speed test, the last saved Local port will be utilized, or the default port "5201".

    .EXAMPLE
    Set-SpeedTestConfig -Local "5201"
    Sets the default Local speed test port to "5201".
    Requires a previously-saved Local speed test server.
#>


function Set-SpeedTestConfig {
    [CmdletBinding()]
    Param(
        [ValidateNotNullOrEmpty()]
        [String]
        $InternetServer,
        [ValidateNotNullOrEmpty()]
        [String]
        $InternetPort,
        [ValidateNotNullOrEmpty()]
        [String]
        $LocalServer,
        [ValidateNotNullOrEmpty()]
        [String]
        $LocalPort
    )

    try {
        $config = Get-SpeedTestConfig
    }
    catch {
        Write-Host "No configuration found - starting with empty configuration."
        $jsonString = @"
    { "defaultPort" : "5201",
        "defaultLocalServer": {
            "defaultServer" : "",
            "defaultPort" : ""
        },
        "defaultInternetServer" : {
            "defaultServer" : "",
            "defaultPort" : ""
        }
    }
"@

        $config = $jsonString | ConvertFrom-Json
    }

    # Detailed parameter validation against current configuration
    if ($InternetPort `
        -and (!($InternetServer)) `
        -and (!($config.defaultInternetServer.defaultServer))) {
        throw "Cannot set an Internet port with an empty InternetServer setting."
        }
    if ($LocalPort `
        -and (!($LocalServer)) `
        -and (!($config.defaultLocalServer.defaultServer))) {
        throw "Cannot set a Local port with an empty LocalServer setting."
    }

    if ($InternetServer) {$config.defaultInternetServer.defaultServer = $InternetServer}
    if ($InternetPort) {$config.defaultInternetServer.defaultPort = $InternetPort}
    if ($LocalServer) {$config.defaultLocalServer.defaultServer = $LocalServer}
    if ($LocalPort) {$config.defaultLocalServer.defaultServer = $LocalPort}

    $config `
        | ConvertTo-Json `
        | Set-Content -Path "$($PSScriptRoot | Split-Path -Parent)\config.json"
}