Download Genshin without the launcher

download_gs.ps1

param (
    [switch]$en = $true,
    [switch]$jp = $false,
    [switch]$ko = $false,
    [switch]$cn = $false,
	[switch]$extract = $false
)

Add-Type -Assembly System.Windows.Forms

function Get-Aria2{
    Invoke-WebRequest -Uri https://github.com/aria2/aria2/releases/download/release-1.35.0/aria2-1.35.0-win-64bit-build1.zip -OutFile 'aria.zip'
    if ((Get-FileHash -Algorithm MD5 'aria.zip' | Select-Object Hash).Hash -ne '118D109C350993E6A8B43CBC3700E0A7') {
        Write-Host "Hash for aria2 does not match. It is possible someone has done something nasty!"
        Remove-Item 'aria.zip'
        exit
    }
    Add-Type -Assembly System.IO.Compression.FileSystem
    $zip = [IO.Compression.ZipFile]::OpenRead('aria.zip')
    $zip.Entries | where {$_.Name -like 'aria2c.exe'} | foreach {[System.IO.Compression.ZipFileExtensions]::ExtractToFile($_, "aria2c.exe", $true)}
    $zip.Dispose()
    Remove-Item 'aria.zip'
}

function Get-7zip{
    Invoke-WebRequest -Uri 'https://download.sourceforge.net/sevenzip/7za920.zip' -OutFile '7z.zip'
    if ((Get-FileHash -Algorithm MD5 '7z.zip' | Select-Object Hash).Hash -ne '2FAC454A90AE96021F4FFC607D4C00F8') {
        Write-Host "Hash for 7zip does not match. It is possible someone has done something nasty!"
        Remove-Item '7z.zip'
        exit
    }
    Add-Type -Assembly System.IO.Compression.FileSystem
    $zip = [IO.Compression.ZipFile]::OpenRead('7z.zip')
    $zip.Entries | where {$_.Name -like '7za.exe'} | foreach {[System.IO.Compression.ZipFileExtensions]::ExtractToFile($_, "7za.exe", $true)}
    $zip.Dispose()
}

function Invoke-AriaDownload{
    param (
        $Uri,
        $MD5hash
    )
    if (-not(Test-Path '.\aria2c.exe')){Get-Aria2}
    $Parms = "-UWget -x16 -j16 -s16 -k 1M -Vtrue --checksum=md5=$MD5hash $Uri"
    $Prms = $Parms.Split() 
    & ".\aria2c.exe" $Prms
}

function Invoke-7zExtraction{
    param(
        $FileName
        )
    if (-not(Test-Path '.\7za.exe')){Get-Aria2}
    $Parms = "x $FileName"
    $Prms = $Parms.Split() 
    & ".\7za.exe" $Prms
}

function Get-GameFiles{
    $target = 'https://sdk-os-static.mihoyo.com/hk4e_global/mdk/launcher/api/resource?launcher_id=10&key=gcStgarh'
    $info = Invoke-WebRequest -Uri $target | ConvertFrom-Json 
    Write-Host "Downloading version $($info.data.game.latest.version)"
    Invoke-AriaDownload -Uri $info.data.game.latest.path -MD5hash $info.data.game.latest.md5
    foreach ($pack in $info.data.game.latest.voice_packs){
        if (($pack.language -eq 'en-us') -and ($en)){
            Invoke-AriaDownload -Uri $pack.path -MD5hash $pack.md5
        }
        if (($pack.language -eq 'ja-jp') -and ($ja)){
            Invoke-AriaDownload -Uri $pack.path -MD5hash $pack.md5
        }
        if (($pack.language -eq 'zh-cn') -and ($ko)){
            Invoke-AriaDownload -Uri $pack.path -MD5hash $pack.md5
        }
        if (($pack.language -eq 'ko-kr') -and ($cn)){
            Invoke-AriaDownload -Uri $pack.path -MD5hash $pack.md5
        }
    }
}

function Extract-AllGameFiles{
     Get-ChildItem -File -Filter *.zip | ForEach-Object {Invoke-7zExtraction -FileName $_}
}

Write-Host("Select your install folder...")
$FileBrowser = New-Object System.Windows.Forms.FolderBrowserDialog
$FileBrowser.Description = "Select your install folder"
if($FileBrowser.ShowDialog((New-Object System.Windows.Forms.Form -Property @{TopMost = $true })) -eq "OK"){
    Set-Location($FileBrowser.SelectedPath)
} else {
    exit
}

Write-Host("Warning: You are about to download 13+ GB of data. Make sure you aren't going to go bankrupt!")
Pause

Get-GameFiles

if ($extract) {
	Invoke-7zExtraction
}