Scripts for Pre-requisite to install RMM

#Powershell version 5.1 or later
$requiredVersion = [version]'5.1';
$installedVersion = $PSVersionTable.PSVersion;
if ($installedVersion -lt $requiredVersion) {
   Write-Host "Error: PowerShell version $($installedVersion.Major).$($installedVersion.Minor) is below the required version $($requiredVersion.Major).$($requiredVersion.Minor). Upgrade to a newer version to run this script.";
}

#500 mb storage
#GET System DRIVE SPACE
$systemDrive = (Get-WmiObject Win32_OperatingSystem).SystemDrive;
if($systemDrive){
    $driveInfo = Get-PSDrive -PSProvider FileSystem | Where-Object { $_.Name -eq $systemDrive[0] };
    if ($driveInfo) {
      $freeSpaceMB = [math]::Round($driveInfo.Free / 1MB, 2);
       if($freeSpaceMB -le 300){
        Write-Host "Warning: Free space is less than 300 MB!";
      }
    }
}
else {
    Write-Host "Warning: Failed to get System Drive!";
}

#64-bit operating system
#Processor Architecture
$processorArchitecture = $env:PROCESSOR_ARCHITECTURE;
if ($processorArchitecture -eq "AMD64") {
#  Write-Host "64-bit processor architecture detected."
} elseif ($processorArchitecture -eq "x86") {
   Write-Host "32-bit processor architecture detected.";
} else {
   Write-Host "Unknown processor architecture: $processorArchitecture";
}

#Registry read/write permission
#CHECK FOR REGISTRY IF IT CAN SET, GET & DELETE
try{
Set-ItemProperty -Path "HKLM:\\SOFTWARE\\Gorelo" -Name "Test" -Value ”test” -Type String -ErrorAction Stop;
$registryTestValue = (Get-ItemProperty -Path "HKLM:\\SOFTWARE\\Gorelo" -Name "Test" -ErrorAction Stop).Test ;
Remove-ItemProperty -Path "HKLM:\\SOFTWARE\\Gorelo" -Name "Test" -Force -ErrorAction Stop;
}
catch {
    Write-Host "Failed to perform registry action. Error: $($_)";
}

#Whitelist gorelo api urls
#Gorelo api
$apiUrls = "https://gorelo-rmm.azurewebsites.net","https://www.google.com/";
Foreach ($apiUrl in $apiUrls)
{
    try {
      $response = Invoke-webrequest -Uri $apiUrl -Method Get -UseBasicParsing;
    # Check the response status code
    if ($response.StatusCode -eq 200) {
         #Write-Host "API request was successful."
    } else {
          Write-Host "API $($apiUrl) request failed with status code: $($response.StatusCode)";
    }
    } catch {
      Write-Host "Failed to access gorelo api. Error: $_";
    }
}

#Event log read/write permission
#AppInsights logger throws permission exception on some devices
$logName = 'Application'
$sourceName = 'GoreloRmmTest'
# If the source does not exist, create it & write it
try {
    if (-not[System.Diagnostics.EventLog]::SourceExists($sourceName)) {
       New-EventLog -LogName $logName -Source $sourceName -ErrorAction Stop;
       #Write-Host "Event source '$sourceName' created in log '$logName'."
    }
    Write-EventLog -LogName $logName -Source $sourceName -EventId 0 -EntryType Information -Message "This is a sample event with source '$sourceName'." -ErrorAction Stop;
}
catch {
    Write-Host "Failed to perform event viewer action. Error: $_";
}

# Define the URL and headers
$url = "https://r1.uw2.rmm.gorelo.io/message"
$headers = @{
    DeviceId = "1"
}
try {
    # Send the GET request and get the response
    $response = Invoke-WebRequest -Uri $url -Headers $headers -Method Get
    # Check the status code and print the appropriate message
    if ($response.StatusCode -eq 204) {
        Write-Output "OK"
    } else {
        throw "Unexpected status code: $($response.StatusCode). Response content: $($response.Content)"
    }
} catch {
    # Catch and display any exceptions 
    Write-Error "An error occurred: $_"
}

#Check Environment Variable
$path = [System.Environment]::GetEnvironmentVariable("PATH")
if ($path -notlike "*system32*") {
    Write-Output "The PATH environment variable does not contain 'system32'."
}