AzureLoginApi.ps1

#Note that Write-Log Function is not present
function AzureLoginApi {
    Param (
        [Parameter(Mandatory = $true)][string]$ClientID,
        [Parameter(Mandatory = $true)][string]$ClientSecret,
        [Parameter(Mandatory = $true)][string]$Tenant,
        [Parameter(Mandatory = $false)][switch]$StorageLogin
    )
    try {
        if ($StorageLogin) { $resource = "https://storage.azure.com/" }
        else { $resource = "https://management.azure.com/" }
        $body = @{grant_type = "client_credentials"; resource = "$resource"; client_id = "$clientID"; client_secret = "$clientSecret" }
        $oauth = Invoke-RestMethod -Method Post -Uri "https://login.microsoftonline.com/$tenant/oauth2/token?api-version=2018-05-05" -Body $body
        $global:authHeader = @{'Authorization' = "$($oauth.token_type) $($oauth.access_token)" }
        if (!$global:authHeader) {
            Write-Log -Mode ERROR -Message "Failed Logging to Azure tenant $tenant, 'authHeader' is empty. Exiting."
            Exit 1
        }
    }
    catch {
        Write-Log -Mode ERROR -Message "AzureLoginApi Failed Logging to Azure tenant $tenant. Exception: $_"
        Exit 1
    }
}