PowerShell Script - Update Env Variables in Files

Replace-Vars.ps1

# Replace-Vars script
#
# Description:
#   Replaces varibles in the specified files
#
# Usage:
#   Replace-Vars.ps1 [files_to_update_array] [config_vars_hash]
#
# Examples:
#   ./Replace-Vars.ps1 ./file1.txt @{ API_URL = 'MY_VAR' }
#   ./Replace-Vars.ps1 ./file1.txt (Get-Content -Raw "/path/to/.env" | ConvertFrom-StringData)
#   ./Replace-Vars.ps1 -Files ./file1.txt,./file2.txt $config
#

param(
  [String[]] $files,
  [Hashtable] $config
)

$ErrorActionPreference = "Stop"

# Key to token function
# NOTE: This must match the keys in the environment
function KeyToToken($key) { "__${key}__" }

# Core function to subsitute values
function ReplaceConfigValues($file, $config)
{
  $config.Keys |
    ForEach-Object `
      { $accum = (Get-Content $file) } `
      { $accum = ($accum -replace (KeyToToken $_), $config[$_]) } `
      { $accum } |
    Set-Content $file
}

# Get the fully qualified paths
$filePaths = @()
foreach ($file in $files) { $filePaths += $(Resolve-Path $file) }

# Starting ...
Write-Output "Started Replace-Vars - Using: $($config | ConvertTo-JSON)"

# Replace values in files
foreach ($file in $filePaths)
{
  Write-Output "Updating: $file"
  ReplaceConfigValues $file $config
}

# Done
Write-Output "`Finished Replace-Vars"
exit 0

Update-AppEnv.ps1

# Update-AppEnv script
#
# Description:
#   Updates the application environment
#
# Usage:
#   Update-AppEnv.ps1 [config_hash]
#
# Example:
#   $config = @{
#     API_URL = 'http://api/'
#     API_KEY = 'ABC'
#     # ...
#   }
#   ./Update-AppEnv.ps1 $config
#

param(
  [Hashtable] $config = $null
)

# Stop script on any error
$ErrorActionPreference = "Stop"

# Helper
function ValueOrDefault($val, $defaultVal) { if ($val -ne $null) { $val } else { $defaultVal } }

# Starting ...
Write-Output "Started Update-AppEnv ..."

# Set the current working directory
$currentDir = Split-Path -parent $PSCommandPath
Push-Location $currentDir

# Look for .env config if no config
if (!$config)
{
  $envFile = (Resolve-Path "${currentDir}/../.env")
  $config = (Get-Content -Raw "${envFile}" | ConvertFrom-StringData)
}

# Set default fallback values
# $config['SOME_KEY'] = ValueOrDefault $config['SOME_KEY'] '[DEFAULT_VALUE]'

# Files to replace values with
$files = @(
  $(Resolve-Path "$currentDir/../dist/main.*.js")
)

# Update files
./Replace-Vars.ps1 -Files $files -Config $config

# Done
Pop-Location
Write-Output "Finished Update-AppEnv ..."
exit 0