Updates js files in place so that the previously deployed sites can access the new versioning strategy

transition-versioning-js.ps1

# transition old style versioning strategy to new. inclusive of existing versions in both strategies
param (
  $AzCopy,
  $SASKey,
  $Language,
  $BlobName,
  $DocLocation,
  $AccountKey
)
$AccountName = ($BlobName.Replace("https://", "") -Split "\.")[0]
$DocDest = "$($BlobName)/`$web/$($Language)"

$replacementTemplates = @{ 
  "javascript" = "assets/js/get_options.js";
  "dotnet" = "styles/main.js";
  "c" = "menu.js";
  "python" = "_static/js/get_options.js";
}

function Get-Target-Uri
{
    Param (
        [Parameter(Mandatory=$true)] [String]$PkgName,
        [Parameter(Mandatory=$true)] [String]$Version
    )

    $replacementTemplate = $replacementTemplates[$Language]

    return "$BlobName/`$web/$Language/$PkgName/$Version/$replacementTemplate$SASKey"
}

function Get-Existing-Versions
{
    Param (
        [Parameter(Mandatory=$true)] [String]$PkgName
    )
    $versionUri = "$($BlobName)/`$web/$($Language)/$($PkgName)/versioning/versions"
    Write-Host "Heading to $versionUri to retrieve known versions"

    try {
        return ((Invoke-RestMethod -Uri $versionUri -MaximumRetryCount 3 -RetryIntervalSec 5) -Split "\n" | % {$_.Trim()} | ? { return $_ })
    }
    catch {
        # Handle 404. If it's 404, this is the first time we've published this package.
        if ($_.Exception.Response.StatusCode.value__ -eq 404){
            Write-Host "Version file does not exist. This is the first time we have published this package."
        }
        else {
            # If it's not a 404. exit. We don't know what's gone wrong.
            Write-Host "Exception getting version file. Aborting"
            Write-Host $_
            exit(1)
        }
    }
}

if (!(Test-Path "$Language.json"))
{
  Write-Host "No cached listing"
  az storage blob list --account-name $AccountName --account-key $AccountKey --container-name "`$web" --prefix "$Language/" --timeout 60 --num-results * --delimiter '/' --query '[].name | [?ends_with(@, `/`)]' | Out-File "$Language.json"
}

# write it to a json, get ready to partay!
$data = Get-Content "$Language.json" | ConvertFrom-Json

# at this point we have stuff of the form <language>/<packagename>/<other directory levels we don't care bout>
# this means that the first element of a split will ALWAYS be the package name
$pkgs = $data | % { ($_ -split "/")[1] } | Select-Object -Unique


foreach ($pkgName in $pkgs){
  Write-Host "Working on $pkgName"

  $versions = Get-Existing-Versions  $pkgName

  foreach($version in $versions)
  {
    $fileName = Get-Target-Uri -PkgName $pkgName -Version $version
    # Write-Host "Replacing js in url $fileName"
    # Write-Host "$($DocLocation)/$Language/get_options.js"
    Write-Host "Replacing JS for $version"

    & $($AzCopy) cp "$($DocLocation)/$Language/get_options.js" $fileName 

    if($lastExitCode)
    {
      Write-Host "Error Detected running $pkgName!"
      exit(1)
    }
  }
}