Avm.Authoring

0.28.0

Engines/Bicep/Get-AvmBicepMcrTagList.ps1

                                function Get-AvmBicepMcrTagList {

    [CmdletBinding()]

    [OutputType([pscustomobject])]

    param(

        [Parameter(Mandatory)]

        [string] $ModulePath

    )

    Set-StrictMode -Version 3.0

    $ErrorActionPreference = 'Stop'

    if ($ModulePath -cnotmatch '^avm/(?:res|ptn|utl)(?:/[a-z0-9]+(?:-[a-z0-9]+)*){2,}\z') {

        throw [AvmConfigurationException]::new("Invalid Bicep module path for MCR: '$ModulePath'.")

    }

    if ($env:AVM_OFFLINE -eq '1') {

        throw [AvmConfigurationException]::new(

            "AVM_OFFLINE=1: published tags for '$ModulePath' cannot be verified without MCR.")

    }

    $registryName = "bicep/$ModulePath"

    $expectedPath = "/v2/$registryName/tags/list"

    $uri = [uri]::new("https://mcr.microsoft.com$expectedPath")

    $seen = [System.Collections.Generic.HashSet[string]]::new([System.StringComparer]::Ordinal)

    $published = [System.Collections.Generic.HashSet[string]]::new([System.StringComparer]::Ordinal)

    $pageQueryPattern = '^\?(?:(?:n=[1-9][0-9]{0,3}&)?last=(?:0|[1-9][0-9]*)\.(?:0|[1-9][0-9]*)\.(?:0|[1-9][0-9]*)(?:&n=[1-9][0-9]{0,3})?)\z'

    $versionPattern = '^(?:0|[1-9][0-9]*)\.(?:0|[1-9][0-9]*)\.(?:0|[1-9][0-9]*)\z'

    for ($page = 0; $page -lt 100; $page++) {

        if ($uri.Scheme -cne 'https' -or $uri.Host -cne 'mcr.microsoft.com' -or

            -not $uri.IsDefaultPort -or $uri.UserInfo -or $uri.Fragment -or

            $uri.AbsolutePath -cne $expectedPath -or

            ($page -eq 0 -and $uri.Query) -or

            ($page -gt 0 -and $uri.Query -cnotmatch $pageQueryPattern)) {

            throw [AvmConfigurationException]::new(

                "MCR tag-list page for '$ModulePath' has an unapproved HTTPS host, path, or query.")

        }

        if (-not $seen.Add($uri.AbsoluteUri)) {

            throw [AvmConfigurationException]::new(

                "MCR tag-list pagination repeated a page for '$ModulePath'.")

        }

        try {

            $response = Invoke-AvmWebRequest -Uri $uri -Headers @{ Accept = 'application/json' } `

                -MaximumRedirection 0 -SkipHttpErrorCheck -TimeoutSec 20 -Label "MCR tag-list request for '$ModulePath'"

        }

        catch [System.Net.Http.HttpRequestException], [System.Net.WebException],

        [System.TimeoutException], [System.Management.Automation.RuntimeException] {

            throw [AvmConfigurationException]::new(

                "Cannot read published tags from '$($uri.AbsoluteUri)': $($_.Exception.Message)")

        }

        if ($null -eq $response.BaseResponse -or

            $null -eq $response.BaseResponse.RequestMessage -or

            $null -eq $response.BaseResponse.RequestMessage.RequestUri -or

            $response.BaseResponse.RequestMessage.RequestUri.AbsoluteUri -cne $uri.AbsoluteUri) {

            throw [AvmConfigurationException]::new(

                "MCR tag-list response for '$ModulePath' cannot be attributed to its requested endpoint.")

        }

        if ($response.StatusCode -notin @(200, 404)) {

            throw [AvmConfigurationException]::new(

                "MCR tag-list request for '$ModulePath' returned HTTP $($response.StatusCode); published versions are unknown.")

        }

        $document = $null

        try {

            $document = [System.Text.Json.JsonDocument]::Parse([string]$response.Content)

        }

        catch [System.Text.Json.JsonException] {

            throw [AvmConfigurationException]::new(

                "MCR tag-list response for '$ModulePath' is not valid JSON: $($_.Exception.Message)")

        }

        try {

            $root = $document.RootElement

            $entry = [System.Text.Json.JsonElement]::new()

            if ($root.ValueKind -ne [System.Text.Json.JsonValueKind]::Object) {

                throw [AvmConfigurationException]::new(

                    "MCR tag-list response for '$ModulePath' must be a JSON object.")

            }

            if ($response.StatusCode -eq 404) {

                if ($page -ne 0 -or

                    -not $root.TryGetProperty('errors', [ref]$entry) -or

                    $entry.ValueKind -ne [System.Text.Json.JsonValueKind]::Array -or

                    $entry.GetArrayLength() -ne 1) {

                    throw [AvmConfigurationException]::new(

                        "MCR returned HTTP 404 for '$ModulePath' without a single registry not-found error.")

                }

                $registryError = $entry[0]

                $code = [System.Text.Json.JsonElement]::new()

                if ($registryError.ValueKind -ne [System.Text.Json.JsonValueKind]::Object -or

                    -not $registryError.TryGetProperty('code', [ref]$code) -or

                    $code.ValueKind -ne [System.Text.Json.JsonValueKind]::String -or

                    $code.GetString() -cne 'NAME_UNKNOWN') {

                    throw [AvmConfigurationException]::new(

                        "MCR returned HTTP 404 for '$ModulePath' without NAME_UNKNOWN.")

                }

                $detail = [System.Text.Json.JsonElement]::new()

                if ($registryError.TryGetProperty('detail', [ref]$detail) -and

                    $detail.ValueKind -ne [System.Text.Json.JsonValueKind]::Null) {

                    $name = [System.Text.Json.JsonElement]::new()

                    if ($detail.ValueKind -ne [System.Text.Json.JsonValueKind]::Object -or

                        -not $detail.TryGetProperty('name', [ref]$name) -or

                        $name.ValueKind -ne [System.Text.Json.JsonValueKind]::String -or

                        $name.GetString() -cne $registryName) {

                        throw [AvmConfigurationException]::new(

                            "MCR returned HTTP 404 for a different repository than '$registryName'.")

                    }

                }

                return [pscustomobject]@{ Exists = $false; Tags = $published }

            }

            $name = [System.Text.Json.JsonElement]::new()

            if (-not $root.TryGetProperty('name', [ref]$name) -or

                $name.ValueKind -ne [System.Text.Json.JsonValueKind]::String -or

                $name.GetString() -cne $registryName -or

                -not $root.TryGetProperty('tags', [ref]$entry) -or

                $entry.ValueKind -ne [System.Text.Json.JsonValueKind]::Array) {

                throw [AvmConfigurationException]::new(

                    "MCR tag-list response for '$ModulePath' lacks the expected repository name and tags array.")

            }

            foreach ($tag in $entry.EnumerateArray()) {

                $parsed = $null

                if ($tag.ValueKind -ne [System.Text.Json.JsonValueKind]::String -or

                    $tag.GetString() -cnotmatch $versionPattern -or

                    -not [version]::TryParse($tag.GetString(), [ref]$parsed) -or

                    -not $published.Add($tag.GetString())) {

                    throw [AvmConfigurationException]::new(

                        "MCR tag-list response for '$ModulePath' contains an invalid or duplicate version tag.")

                }

            }

        }

        finally {

            $document.Dispose()

        }

        if ($null -eq $response.Headers) {

            throw [AvmConfigurationException]::new(

                "MCR tag-list response for '$ModulePath' has no inspectable headers.")

        }

        $link = @($response.Headers['Link']) -join ','

        if ([string]::IsNullOrWhiteSpace($link)) {

            return [pscustomobject]@{ Exists = $true; Tags = $published }

        }

        $next = [regex]::Match($link, '^\s*<(?<url>[^<>]+)>;\s*rel="?next"?\s*\z')

        if (-not $next.Success) {

            throw [AvmConfigurationException]::new(

                "MCR tag-list response for '$ModulePath' has an uninspectable pagination link.")

        }

        $uri = [uri]::new($uri, $next.Groups['url'].Value)

    }

    throw [AvmConfigurationException]::new(

        "MCR tag-list response for '$ModulePath' exceeded the page limit; published versions are unknown.")

}

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