optifine.netの更新をDiscordにWebhookで通知するPowershellスクリプト

OptifineNotifier.ps1

#190424
#for pwsh linux
#requires -version 6.1

#$PSName = "$(Split-Path $PSCommandPath -Parent)/$(Split-Path $PSCommandPath -Leafbase)"
$PSName = $PSCommandPath.Replace('.ps1','')

#投稿関数
function Post-Discord($i)
{
    $Content =
@"
**$($i.File) Released.**

Download Link:
<$($i.Mirror)>
ChangeLog:
<$(($i.Changelog).Replace('about:','http://optifine.net/'))>
"@
    $Content
    Invoke-RestMethod -Uri 'https://discordapp.com/api/webhooks/XXXXXXXXXX' -Method Post -Body ([System.Text.Encoding]::UTF8.GetBytes($([PSCustomObject]@{content = $Content} | ConvertTo-Json)))
}

#メインルーチン
#optifine.netから取得
$Response = Invoke-WebRequest -Uri 'https://optifine.net/downloads'

#HTMLのStringをLFで分割してArrayとして変数に格納
$Response = $Response.Content -split '\n'

#Preview、Releaseそれぞれの最新バージョンの行を取得
[PSCustomObject]$Latest =
@{
    Preview =
    @{
        File = ($Response | Where-Object {$_ -match "td class=`'downloadLineFile`'"})[0]
    }
    Release =
    @{
        File = ($Response | Where-Object {$_ -match "td class=`'downloadLineFileFirst`'"})[0]
    }
}

#Fileは整形、Dateはそれに該当する行を取得・整形
[PSCustomObject]$Latest =
@{
    Preview =
    @{
        File = $Latest.Preview.File -split "<.*?>" | Where-Object {$_ -ne ""}
        Date = $Response[[Array]::IndexOf($Response,$Latest.Preview.File) + 4] -split "<.*?>" | Where-Object {$_ -ne ""}
    }
    Release =
    @{
        File = $Latest.Release.File -split "<.*?>" | Where-Object {$_ -ne ""}
        Date = $Response[[Array]::IndexOf($Response,$Latest.Release.File) + 4] -split "<.*?>" | Where-Object {$_ -ne ""}
    }
}

#Fileはそのまま、MirrorとChangelogはFileを元に生成、DateはStringからDate型に変換
[PSCustomObject]$Latest =
@{
    Preview =
    @{
        File = $Latest.Preview.File
        Mirror = "https://optifine.net/adloadx?f=preview_$($Latest.Preview.File -replace ' ','_').jar" #adf.lyでないMirrorのURLを選択
        Changelog = "https://optifine.net/changelog?f=preview_$($Latest.Preview.File -replace ' ','_').jar"
        Date = [System.DateTimeOffset]::ParseExact("$($Latest.Preview.Date)","dd.MM.yyyy",$Null) #preview版は正式版がリリースされると消され、古いバージョンが先頭に来てしまうため、日付の大小による判別が適切
    }
    Release =
    @{
        File = $Latest.Release.File
        Mirror = "https://optifine.net/adloadx?f=$($Latest.Release.File -replace ' ','_').jar"
        Changelog = "https://optifine.net/changelog?f=$($Latest.Release.File -replace ' ','_').jar"
        Date = [System.DateTimeOffset]::ParseExact("$($Latest.Release.Date)","dd.MM.yyyy",$Null)
    }
}

#前回の実行結果を取得
[PSCustomObject]$BeforeLatest = Get-Content -Encoding UTF8 "$PSName.json" -ErrorAction SilentlyContinue | ConvertFrom-Json

#初回($Null)又はPreview版の日付が大きくなった場合Post
#pwshではOut-FileしたJsonに含まれるDateTimeがズレる不具合が無いようなので、$Latest.Preview.Date.UtcDateTimeとしなくて良い[要出典]
if ($Latest.Preview.Date -gt $BeforeLatest.Preview.Date)
{
    Post-Discord $Latest.Preview
}

#初回($Null)又はRelease版の日付が大きくなった場合Post
if ($Latest.Release.Date -gt $BeforeLatest.Release.Date)
{
    Post-Discord $Latest.Release
}

#比較用jsonファイルを更新
$Latest | ConvertTo-Json | Out-File "$PSName.json" -Encoding UTF8