functions/azure/Get-UniqueSuffix.ps1
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# <copyright file="Get-UniqueSuffix.ps1" company="Endjin Limited"> # Copyright (c) Endjin Limited. All rights reserved. # </copyright> <# .SYNOPSIS Generates a unique suffix to use for resource names. .DESCRIPTION Generates a deterministic hash from a set of inputs, and returns an 12 character alphabetic string to use as a resource name suffix. .PARAMETER SubscriptionId The subscription ID of the target Azure subscription. .PARAMETER StackName The name of the deployment stack, which is a grouping for what may be multiple services (e.g. a Marain stack). .PARAMETER ServiceInstance The instance ID of the service for the deployment. .PARAMETER Environment The name of the environment for the deployment. #> function Get-UniqueSuffix { [CmdletBinding()] param ( [Parameter(Position=0)] [string] $SubscriptionId, [Parameter(Position=1)] [string] $StackName, [Parameter(Position=2)] [string] $ServiceInstance, [Parameter(Position=3)] [string] $Environment ) function Get-UniqueString ([string]$id, $length=12) { $hashArray = (New-Object System.Security.Cryptography.SHA512Managed).ComputeHash($id.ToCharArray()) -join ($hashArray[1..$length] | ForEach-Object { [char]($_ % 26 + [byte][char]'a') }) } $inputString = "{0}__{1}__{2}__{3}" -f $SubscriptionId, $StackName, $ServiceInstance, $Environment return Get-UniqueString $inputString } |