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. .PARAMETER SubscriptionId The instance ID of the service for the deployment. .PARAMETER Environment The name of the environment for the deployment. #> function Get-UniqueSuffix { 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 } |