A3_MOD_Downloader.ps1

<#
    Arma 3 Steam Workshop Content Downloader
    Created by: Brian Hill

    • Requires Arma 3 Dedicated Server files to be downloaded
    • Requires SteamCMD - https://developer.valvesoftware.com/wiki/SteamCMD
    • Customize the directory locations for your server
    • Add to the list of MOD's you wish to download from the Steam Workshop
#>

# Directory Locations
$steamcmdpath = "C:\Servers\SteamCMD"  # Location of SteamCMD folder
$a3folder = "C:\Servers\Arma3\"  # Location of Arma 3 server folder

# Steam Workshop Items To Download
$mods = @(
    # Create a new line for each mod
    # 'modName' = folder name to install mod into
    # 'modID' = ID of workshop item, can be found in the URL. Eg: https://steamcommunity.com/workshop/filedetails/?id=450814997
    # 'download' = true/false. False will skip downloading the mod.

    <#  Framework / Utility MOD's  #>
    [pscustomobject]@{modName='@cba_a3';modID='450814997';download='true'}
    [pscustomobject]@{modName='@ace3';modID='463939057';download='true'}

    <#  Weapons / Vehicles / Uniforms / Equipment MOD's  #>
    [pscustomobject]@{modName='@RHSAFRF';modID='843425103';download='false'}
    [pscustomobject]@{modName='@RHSUSAF';modID='843577117';download='false'}
    [pscustomobject]@{modName='@RHSGREF';modID='843593391';download='false'}
    [pscustomobject]@{modName='@RHSSAF';modID='843632231';download='false'}

    <#  Terrain MOD's  #>
    [pscustomobject]@{modName='@Cup_Terrains_Core';modID='583496184';download='false'}
    [pscustomobject]@{modName='@Cup_Terrains_Maps';modID='583544987';download='false'}
    [pscustomobject]@{modName='@Taviana';modID='1333620906';download='false'}
    [pscustomobject]@{modName='@Kujari';modID='1726494027';download='false'}
    [pscustomobject]@{modName='@Beketov';modID='743968516';download='false'}

    <#  Scenario / Mission MOD's  #>
    [pscustomobject]@{modName='@Vindicta';modID='2185874952';download='false'}

    <#  Miscellaneous MOD's  #>
    [pscustomobject]@{modName='@FileXT';modID='2162811561';download='false'}
)

<#################################################################################
        DO NOT MODIFY BELOW
#################################################################################>

# Steam Credentials
$username = Read-Host -Prompt 'Enter username to use with SteamCMD'
$password = Read-Host -Prompt 'Enter password to use with SteamCMD'

$steamcmd = Join-Path -Path $steamcmdpath -ChildPath "\steamcmd.exe"
$modslocation = Join-Path -Path $steamcmdpath -ChildPath "\steamapps\workshop\content\107410\"

# Create steamcmd commands file
foreach ($mod in $mods) {
    $modid = $mod[0].modID

    if ($mod[0].download -eq "true") {
        # Create folder for mod
        Add-Content -path $steamcmdpath\steamcmnds.txt -value "workshop_download_item 107410 $modid validate"
    }
} 

Add-Content -path $steamcmdpath\steamcmnds.txt -value "quit"

# Download all mods
WRITE-HOST ""
WRITE-HOST "Downloading all Mods at once"

& $steamcmd '+login' $username $password '+runscript steamcmnds.txt'

WRITE-HOST ""
WRITE-HOST "Finished downloading"
WRITE-HOST ""

# cleanup steamcmd commands file
Set-Content -path $steamcmdpath\steamcmnds.txt -value ""

foreach ($mod in $mods) {
    if ($mod[0].download -eq "true") {
        $sourcedir = Join-Path -Path $modslocation -ChildPath $mod[0].modID
        $destdir = Join-Path -Path $a3folder -ChildPath $mod[0].modName

        # Check if Symlink already exists
        if (!(test-path $destdir)) {
            WRITE-HOST "Creating symlink to mod in server folder"
            # Create symlink from download location to server folder
            cmd "/c mklink /D $destdir $sourcedir"
        } else {
            WRITE-HOST "Symlink already exists"
        }

        # Copy bikey file to server's keys folder
        $keysource = Join-Path -Path $modslocation -ChildPath $mod[0].modID
        $keydest = Join-Path -Path $a3folder -ChildPath "keys"
        $bikeypath = Get-ChildItem -Path $keysource -Recurse -Filter *.bikey
        # Only Copy the key if it doesn't already exist (This can happen if multiple mods of the same creator are downloaded)
        if (!(test-path "$keydest\$bikeypath.Name")) {
            WRITE-HOST ""
            WRITE-HOST "Copying .bikey file to server's keys folder"
            Copy-Item -Path $bikeypath.FullName -Destination $keydest
        }
    }
}