# Simple WebService to run various powershell commands

# You have to install and bind certificate manually, if HTTPS is used as Admin with 
# netsh http add sslcert ipport=0.0.0.0:44388 certhash=<hashvalue> "appid={01234567-1234-1234-1234-1234567890AB}"
# remove with 
# netsh http delete sslcert ipport=0.0.0.0:44388

param (
    [string]$listenparam = "http://+:44388/",  #"https://+:443/",  #"http://+:80/"
    [string]$configfile = ".\config.csv"
)

set-PSDebug -strict

$error.clear()
Write-host "ADSyncWebService:Start"
Write-host " Parameter Listenparam: $($listenparam)"
Write-host " Parameter Configfile : $($configfile)"

Write-host " Checking Configfile $($configfile)"
if (Test-Path -path $configfile -pathtype leaf) {
    Write-host " Importing Configfile $($configfile)"
    $configcsv = import-csv $configfile
    Write-host " Configfile loaded. total lines $($configcsv.count)"
    $line = 0
    foreach ($config in $configcsv) {
        $line++
        Write-host " Checking config line $($line) " -nonewline
        if (!$config.action) {Write-Host  "no mandantory Action found" -ForegroundColor red; exit}
        if (!$config.secret) {Write-Host  "no mandantory Secret found" -ForegroundColor red; exit}
        if (!$config.script) {Write-Host  "no mandantory script found" -ForegroundColor red; exit}
        Write-host "Looks valid" -ForegroundColor green
    }
}
else {
    Write-Error "Configfile $($configfile) not found"
}

Write-host " Init HTTPListener on $($listenparam)"
try{
    $HttpListener = New-Object System.Net.HttpListener
    $HttpListener.Prefixes.Add($listenparam)
    $HttpListener.Start()
}
catch {
    Write-Error "Unable to create HTTPListener. Run as Admin or add binding with NetSH"
    Exit 1
}

While ($HttpListener.IsListening -and (!([console]::KeyAvailable))) {
    Write-Host "---- Waiting for Request on $($listenparam)  Press any key and wait until next request arrives" -BackgroundColor blue
    $HttpContext = $HttpListener.GetContext()
    
    if(([console]::KeyAvailable)){
        Write-host "Keypress detected - terminating script" -ForegroundColor green
        break
    }

    $HttpRequest = $HttpContext.Request
    $RequestUrl = $HttpRequest.Url.OriginalString
    Write-Host " Got: $($RequestUrl)" -ForegroundColor green
    if($HttpRequest.HasEntityBody) {
        $Reader = New-Object System.IO.StreamReader($HttpRequest.InputStream)
        $body =  $Reader.ReadToEnd()
        Write-Host " Body: $($body)" 
    }
    else {
        Write-Host " Body: <empty>" 
        [string]$body=$null
    }
    #$HttpRequest
    $request = [pscustomobject][ordered]@{
        url = $httpRequest.url
        rawurl = $httpRequest.rawurl
        headers = $httpRequest.headers
        HttpMethod = $httpRequest.HttpMethod
        UserAgent = $httpRequest.UserAgent
        RemoteEndPoint = $httpRequest.RemoteEndPoint
        QueryString = $HttpRequest.QueryString
        body = $body
    }
    
    $returnbody = @()
    [string]$action = $HttpRequest.QueryString["action"]
    [string]$secret = $HttpRequest.QueryString["secret"]
    $HttpResponse = $HttpContext.Response
    Write-Host " Action:$($action)"
    Write-Host " Secret:$($secret)"
    if (!$action){
        Write-Warning "Action not specified"
        $returnbody = "Action not specified"
        $HttpResponse.StatusCode = 400  # bad request
    }
    elseif (!$secret){
        Write-Warning "Secret not specified"
        $returnbody = "Secret not specified"
        $HttpResponse.StatusCode = 400  # bad request
    }
    else {
        Write-Host "---Start Processing Configuration"
        foreach ($config in $configcsv) {
            Write-Host "CheckingConfigLine  $(($config | convertto-csv -NoTypeInformation)[1])" -NoNewline
            if ($config.action -ne $action) {
                Write-Host "Action-NoMatch" -ForegroundColor Yellow
            }
            elseif ($config.secret -ne $secret) {
                Write-Host "Secret-NoMatch" -ForegroundColor Yellow
            }
            else {
                Write-Host "Match"
                Write-host "Starting Script $($config.script)" -ForegroundColor Magenta
                $returnbody+= & ".\$($config.script)" -request $request
            } 
        }
    }

    if (!$returnbody) {
        $returnbody+="{Result = NoRulesMatch}"
    }
    $HttpResponse.StatusCode = 200
    $HttpResponse.Headers.Add("Content-Type","application/json")
    $ResponseBuffer = [System.Text.Encoding]::UTF8.GetBytes(($returnbody | ConvertTo-Json))
    $HttpResponse.ContentLength64 = $ResponseBuffer.Length
    $HttpResponse.OutputStream.Write($ResponseBuffer,0,$ResponseBuffer.Length)
    $HttpResponse.Close()
    Write-Host "Processing Done"
}
Write-host " Stopping HTTPListener"
$HttpListener.Stop()

Write-host "ADSyncWebService:End"