net-core-appsettings-json-variable-replacement-in-appveyor

net-core-appsettings-json-variable-replacement-in-appveyor-1.ps1

Write-Host "Environment Variable Substitution"

$variables = gci $env:$env:APPLICATION_PREFIX* | Select-Object -Property Key, Value

$configPath = "$env:APPLICATION_PATH\$env:CONFIG_FILE"

Write-Output "Loading config file from $configPath"
$appSettings = Get-Content -Raw $configPath | ConvertFrom-Json

foreach($variable in $variables) {
    $matchString = $variable.Key.replace($env:APPLICATION_PREFIX, "")

    $matchProperties = $matchString.Split(".")

    if($matchProperties.Count -gt 1) {
        $match = $appSettings.($matchProperties[0]).psobject.properties | where { $_.Name -eq $matchProperties[1] } 
        if ($match) {
            $appSettings.($matchProperties[0]).($matchProperties[1]) = $variable.Value
        }
        else {
            Write-Output "Could not find match for $matchString"
        }
    }
    else {
        $match = $appSettings.psobject.properties | where { $_.Name -eq $matchString } 
        if ($match) {
            $appSettings.($matchString) = $variable.Value
        }
        else {
            Write-Output "Could not find match for $matchString"
        }
    }
}

$appSettings | ConvertTo-Json -depth 100 | Out-File $configPath

I got it working. I had to separate $env:$env:APPLICATION_PREFIX* into two lines (amongst a few other things).
All together, this is a much smoother solution than the parameters.xml from .net framework. Thanks for the contribution!

Hi @eivindivine,
That's great news! I was testing it out a little yesterday and had noticed my actual final version of the code is hard-coded with the application prefix

$variables = gci $env:APPID_* | Select-Object -Property Key, Value

So thats my mistake. If you'd like to share your changes, I'd be happy to update this file and credit you.

Also your assumptions on the variable replacement configuration are correct, but you probably knew that already.

Thanks!

@mitchgollub I wasn't able to send direct messages so I had to create it as a page:
https://gist.github.com/eivindivine/83cbfbf2efb97575ec7c1268459a05a0/041585263d9c428a4d8506510626c875948abc58