Microsoft.PowerPlatform.EnterprisePolicies

0.19.0

Private/CacheMethods.ps1

                                <#

SAMPLE CODE NOTICE

THIS SAMPLE CODE IS MADE AVAILABLE AS IS. MICROSOFT MAKES NO WARRANTIES, WHETHER EXPRESS OR IMPLIED,

OF FITNESS FOR A PARTICULAR PURPOSE, OF ACCURACY OR COMPLETENESS OF RESPONSES, OF RESULTS, OR CONDITIONS OF MERCHANTABILITY.

THE ENTIRE RISK OF THE USE OR THE RESULTS FROM THE USE OF THIS SAMPLE CODE REMAINS WITH THE USER.

NO TECHNICAL SUPPORT IS PROVIDED. YOU MAY NOT DISTRIBUTE THIS CODE UNLESS YOU HAVE A LICENSE AGREEMENT WITH MICROSOFT THAT ALLOWS YOU TO DO SO.

#>

$script:CachePath = Join-Path $([Environment]::GetFolderPath('LocalApplicationData')) 'Microsoft.PowerPlatform.EnterprisePolicies\config.json'

$script:CacheData = $null

$script:CurrentCacheVersion = "1.1"

function Get-EmptyCache{

    return [PSCustomObject]@{

        Version = $script:CurrentCacheVersion

        SubscriptionsValidated = @()

        RegionCache = [PSCustomObject]@{}

        Configuration = [PSCustomObject]@{}

    }

}

function Update-CacheVersion{

    param(

        [Parameter(Mandatory)]

        [PSCustomObject]$Cache

    )

    while($Cache.Version -ne $script:CurrentCacheVersion){

        switch($Cache.Version){

            "1.0" {

                $Cache | Add-Member -NotePropertyName "RegionCache" -NotePropertyValue ([PSCustomObject]@{})

                $Cache.Version = "1.1"

                Write-Verbose "Upgraded cache from 1.0 to 1.1"

            }

            default {

                Write-Warning "Unknown cache version '$($Cache.Version)'. Resetting to empty cache."

                return Get-EmptyCache

            }

        }

    }

    return $Cache

}

function Initialize-Cache{

    if(-not(Test-Path -Path $script:CachePath)){

        Write-Verbose "Cache file not found. Initializing new cache."

        $script:CacheData = Get-EmptyCache

    }

    else{

        Write-Verbose "Loading cache from $script:CachePath"

        $content = Get-Content -Path $script:CachePath

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

            Write-Verbose "Cache file is empty. Initializing new cache."

            $script:CacheData = Get-EmptyCache

        }

        else{

            $script:CacheData = $content | ConvertFrom-Json

            $script:CacheData = Update-CacheVersion -Cache $script:CacheData

            foreach($key in $script:CacheData.RegionCache.PSObject.Properties.Name){

                $entry = $script:CacheData.RegionCache.$key

                if($entry.Expiry -is [string]){

                    $entry.Expiry = [DateTime]::Parse($entry.Expiry).ToUniversalTime()

                }

            }

        }

    }

}

function Save-Cache{

    if(-not(Test-Path -Path (Split-Path -Path $script:CachePath))){

        New-Item -ItemType Directory -Path (Split-Path -Path $script:CachePath) -Force | Out-Null

    }

    $script:CacheData | ConvertTo-Json -Depth 10 | Out-File -FilePath $script:CachePath -Force

}

function Test-SubscriptionValidated{

    param(

        [Parameter(Mandatory)]

        [ValidateNotNullOrEmpty()]

        [string]$SubscriptionId

    )

    return $script:CacheData.SubscriptionsValidated -contains $SubscriptionId

}

function Add-ValidatedSubscriptionToCache{

    param(

        [Parameter(Mandatory)]

        [ValidateNotNullOrEmpty()]

        [string]$SubscriptionId

    )

    if(-not($script:CacheData.SubscriptionsValidated -contains $SubscriptionId)){

        $script:CacheData.SubscriptionsValidated += $SubscriptionId

        Save-Cache

    }

}

function Get-CachedConfiguration{

    param(

        [Parameter(Mandatory=$false)]

        [string]$Name

    )

    # Reads from the generic configuration container in the cache. With no name, returns the

    # entire container; with a name, returns that entry's value (or $null when it is not set).

    if($null -eq $script:CacheData.Configuration){

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

            return [PSCustomObject]@{}

        }

        return $null

    }

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

        return $script:CacheData.Configuration

    }

    # Configuration may be a PSCustomObject (from JSON) or a hashtable (in-memory)

    if($script:CacheData.Configuration -is [hashtable]){

        if($script:CacheData.Configuration.ContainsKey($Name)){

            return $script:CacheData.Configuration[$Name]

        }

        return $null

    }

    $property = $script:CacheData.Configuration.PSObject.Properties[$Name]

    if($null -eq $property){

        return $null

    }

    return $property.Value

}

function Set-CachedConfiguration{

    param(

        [Parameter(Mandatory)]

        [ValidateNotNullOrEmpty()]

        [string]$Name,

        [Parameter(Mandatory)]

        [AllowNull()]

        [object]$Value

    )

    # Ensure the configuration container exists (for caches created before this feature)

    if($null -eq $script:CacheData.Configuration){

        if($script:CacheData -is [hashtable]){

            $script:CacheData["Configuration"] = [PSCustomObject]@{}

        }

        else{

            $script:CacheData | Add-Member -NotePropertyName "Configuration" -NotePropertyValue ([PSCustomObject]@{}) -Force

        }

    }

    if($script:CacheData.Configuration -is [hashtable]){

        if($null -eq $Value){

            $script:CacheData.Configuration.Remove($Name)

        }

        else{

            $script:CacheData.Configuration[$Name] = $Value

        }

    }

    else{

        if($null -eq $Value){

            if($null -ne $script:CacheData.Configuration.PSObject.Properties[$Name]){

                $script:CacheData.Configuration.PSObject.Properties.Remove($Name)

            }

        }

        else{

            $script:CacheData.Configuration | Add-Member -NotePropertyName $Name -NotePropertyValue $Value -Force

        }

    }

    Save-Cache

}

function Get-CachedServicePrincipalAuth{

    # Reads the service principal auth configuration from the generic configuration

    # container in the cache. Returns $null when it has not been configured.

    return Get-CachedConfiguration -Name "ServicePrincipalAuth"

}

function Get-EnvironmentRegionFromCache{

    param(

        [Parameter(Mandatory)]

        [ValidateNotNullOrEmpty()]

        [string]$EnvironmentId,

        [Parameter(Mandatory)]

        [PPEndpoint]$Endpoint,

        [Parameter(Mandatory=$false)]

        [string]$TenantId

    )

    $cacheKey = "$EnvironmentId|$Endpoint"

    # Check for cached entry

    if($script:CacheData.RegionCache.PSObject.Properties.Name -contains $cacheKey){

        $now = [DateTime]::UtcNow

        $entry = $script:CacheData.RegionCache.$cacheKey

        $expiry = if($entry.Expiry -is [DateTime]){

                $entry.Expiry.ToUniversalTime()

            }

            else{

                $entry.Expiry = $now

            }

        if($expiry -gt $now){

            $remainingMinutes = [math]::Round(($expiry - $now).TotalMinutes, 1)

            Write-Verbose "Region cache hit for $cacheKey. Region: $($entry.Region). Cache valid for $remainingMinutes more minutes."

            return $entry.Region

        }

    }

    # Cache miss or expired - call Get-EnvironmentRegion

    Write-Verbose "Region cache miss for $cacheKey. Calling Get-EnvironmentRegion."

    $params = @{

        EnvironmentId = $EnvironmentId

        Endpoint = $Endpoint

    }

    if(-not([string]::IsNullOrWhiteSpace($TenantId))){

        $params["TenantId"] = $TenantId

    }

    $region = Get-EnvironmentRegion @params

    Write-Verbose "Region resolved for $cacheKey. Region: $region. Caching for 1 hour."

    # Store in cache with 1-hour expiry

    $cacheEntry = [PSCustomObject]@{

        Region = $region

        Expiry = [DateTime]::UtcNow.AddHours(1)

    }

    if($script:CacheData.RegionCache.PSObject.Properties.Name -contains $cacheKey){

        $script:CacheData.RegionCache.$cacheKey = $cacheEntry

    }

    else{

        $script:CacheData.RegionCache | Add-Member -NotePropertyName $cacheKey -NotePropertyValue $cacheEntry

    }

    Save-Cache

    return $region

}

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