Public/Common/Get-CmAzResourceName.ps1
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function Get-CmAzResourceName { <# .Synopsis Generates a name for a resource based on predefined naming conventions. .Description Returns a message, validating that the package has been correctly installed. .Component Common .Parameter Resource The type of the resource. .Parameter Architecture Infrastructure the resource is used for. .Parameter Region Where the resource will be located. .Parameter Name Custom value to provide contextual value to the resource. .Parameter SubscriptionName Name of the subscription the resource will be deployed in, defaults to the current subscription in the azcontext. .Parameter IncludeBuild For VM and VMscalesets replaces hash with build ID. For all other resources appends build id to hash. .Parameter MaxLength Max length of the name to be generated. .Example Get-CmAzResourceName -Resource "ResourceGroup" -Architecture "Core" -Region "UK South" -Name "DocsWebsite" Output: rg-docswebsite-core-97547bfe .Example Get-CmAzResourceName -Resource "VirtualMachine" -Architecture "Core" -Region "UK South" -Name "NewWebsite" -IncludeBuild Output: rg-newwebsite-core-2a04bdf4-001 .Example Get-CmAzResourceName -Resource "VirtualMachine" -Architecture "Core" -Region "UK South" -Name "mywindows" -IncludeBuild Output: vmmywindows001 .Example Get-CmAzResourceName -Resource "VirtualMachine" -Architecture "Core" -Region "UK South" -Name "mywindows" Output: vmmywindowsa941 #> [CmdletBinding()] [OutputType([PSObject])] param( [Parameter(Mandatory=$true)] [String] $Resource, [Parameter(Mandatory=$true)] [String] $Architecture, [Parameter(Mandatory=$true)] [String] $Region, [Parameter(Mandatory=$true)] [String] $Name, [String] $SubscriptionName = (Get-AzContext).SubscriptionName, [switch] $IncludeBuild = $False, [Int] $MaxLength = 0 ) process { try { $ctx = Get-CmAzContext -ThrowIfUnavailable $generators = Get-CmAzSettingsFile -Path "$($ctx.ProjectRoot)\_names\generators.yml"; $tokens = Get-CmAzSettingsFile -Path "$($ctx.ProjectRoot)\_names\tokens.yml"; $regions = Get-CmAzSettingsFile -Path "$($ctx.ProjectRoot)\_names\regions.yml"; $resources = Get-CmAzSettingsFile -Path "$($ctx.ProjectRoot)\_names\resources.yml"; $buildId = (Get-CmAzContext).BuildId $generatedName = ""; $nameSegments = @(); $regionConvention = $regions.regions | Where-Object { $_.name -Eq $Region } if (!($regionConvention)) { throw "No regional naming convention found in _names\regions.yml for '$Region'" } $resourceConvention = $resources.resources | Where-Object { $_.name -Eq $Resource } $resourceShortname = $resources.defaults.shortname; $generator = $resources.defaults.generator; # We found a resource-based convention, which probably has its own generator. if ($resourceConvention) { $generator = $resourceConvention.generator; $resourceShortname = $resourceConvention.shortname; if(!$MaxLength){ $MaxLength = $resourceConvention.maxLength; } Write-Verbose "Found resource-based convention for $Resource ($resourceShortname), selecting generator $generator"; } else { Write-Verbose "No resource-based convention for $Resource ($resourceShortname), defaulting to generator $generator"; } $gen = $generators.formats | Where-Object { $_.name -Eq $generator } if (!$gen) { throw "_naming/resources.yml refers to a generator $generator which does not exist in _naming/generators.yml" } foreach ($component in $gen.components) { switch ($component.source) { "organisation" { $nameSegments += $tokens.organisation} "project" { $nameSegments += $tokens.project } "architecture" { $nameSegments += $tokens.architecture[$Architecture.ToLower()] } "environment" { $nameSegments += $tokens.environments[$ctx.Environment.ToLower()] } "resource" { $nameSegments += $resourceShortname } "region" { $nameSegments += $regionConvention.shortname } "name" { $nameSegments += $Name.ToLower() } "subscriptionName" { $nameSegments += $SubscriptionName[0..3]} "buildId" { if($IncludeBuild){ $nameSegments += $buildId }else{ $hash = $nameSegments -Join $gen.separator $hash += "|" + $settings.tokens.salt $bytes = [System.Text.Encoding]::UTF8.GetBytes($hash) $algorithm = [System.Security.Cryptography.HashAlgorithm]::Create("MD5") $sb = New-Object System.Text.StringBuilder $algorithm.ComputeHash($bytes) | ForEach-Object { $null = $sb.Append($_.ToString("x2")) } $hashLength = if ($component.maxLength) { $component.maxLength } else { 8 } $nameSegments += $sb.ToString().Substring(0, $hashLength) } } "hash" { $hash = $nameSegments -Join $gen.separator $hash += "|" + $settings.tokens.salt $bytes = [System.Text.Encoding]::UTF8.GetBytes($hash) $algorithm = [System.Security.Cryptography.HashAlgorithm]::Create("MD5") $sb = New-Object System.Text.StringBuilder $algorithm.ComputeHash($bytes) | ForEach-Object { $null = $sb.Append($_.ToString("x2")) } $hashLength = if ($component.maxLength) { $component.maxLength } else { 8 } $nameSegments += $sb.ToString().Substring(0, $hashLength) if($IncludeBuild){ $nameSegments += $buildId } } } } # Strip out any empty entries so that we don't end up with double dashes # anywhere within a name. $nameSegments = $nameSegments | Where-Object {$_} $generatedName = $nameSegments -Join $gen.separator if ($gen.removeCharacters) { foreach ($charToRemove in $gen.removeCharacters) { Write-Verbose "Removing $($charToRemove) from resource name.."; $generatedName = $generatedName -replace $charToRemove, '' } } if ($MaxLength -Gt 0) { $length = if ($generatedName.Length -Gt $MaxLength) { $MaxLength } else { $generatedName.Length } $generatedName = $generatedName.Substring(0, $length) } $generatedName = $generatedName.trimEnd("-") $generatedName } catch { $PSCmdlet.ThrowTerminatingError($PSitem) } } } |