Fetch PowerShell release information and convert to an ORAS artifact manifest

pwsh-oras-manifest.ps1

# Fetch latest PowerShell release information from GitHub and export ORAS manifest

$Headers = @{
    Accept = "application/vnd.github.v3+json";
}

$RequestParams = @{
    Method = 'GET';
    Headers = $Headers;
    UseBasicParsing = $true;
    Uri = "https://api.github.com/repos/PowerShell/PowerShell/releases/latest";
}

$Response = $(Invoke-WebRequest @RequestParams).Content | ConvertFrom-Json

# GitHub release tag

$TagName = $Response.tag_name

# extract PowerShell artifact hashes from textual release description

$Hashes = @{}
$HashMatches = $($Response.body | Select-String -AllMatches -Pattern '\- (.*)\n  \- (.*)\n').Matches
foreach ($HashMatch in $HashMatches) {
    $FileName = $($HashMatch.Groups[1].Value | Out-String).Trim()
    $FileHash = $($HashMatch.Groups[2].Value | Out-String).Trim()
    $Hashes[$FileName] = $FileHash
}

# create array of blob artifacts

$blobs = @()
$Response.assets | ForEach-Object {
    $filename = $_.name
    $mediaType = "application/octet-stream"
    $digest = "sha256`:$($Hashes[$filename])"
    $url = $_.browser_download_url

    $blob = [PSCustomObject]@{
        mediaType = $mediaType
        digest = $digest
        urls = @($url)
        filename = $filename
    }
    $blobs += $blob
}

$Manifest = [PSCustomObject]@{
    artifactType = "org.cncf.oras.manifest.annotations"
    blobs = $blobs
}

# Convert to JSON and export manifest

$json = $Manifest | ConvertTo-Json -Depth 8

Write-Host "PowerShell $TagName"
Write-Host $json

Set-Content -Path "powershell-$TagName.json" -Value $json -Encoding utf8NoBOM