Generate user/pass for PowerShell deploy script

- Generates the password to mirror deploy_stack.sh
- Uses hardcoded admin to mirror deploy_stack.sh
- Uses throw to exit when error
- Updates faas-cli login command for Powershell

Signed-off-by: John McCabe <john@johnmccabe.net>

deploy_stack.ps1

@@ -1,10 +1,23 @@
 #!ps1
 
+param (
+    [switch] $noAuth,
+    [switch] $n
+)
+
 if (Get-Command docker -errorAction SilentlyContinue)
 {
     docker node ls 2>&1 | out-null
-    if($?)
+    if(-Not $?)
     {
+        throw "Docker not in swarm mode, please initialise the cluster (`docker swarm init`) and retry"
+    }
+
+    Add-Type -AssemblyName System.Web
+    $secret = [System.Web.Security.Membership]::GeneratePassword(24,5)
+    $user = 'admin'
+
+    Write-Host "Attempting to create credentials for gateway.."
     $user_secret = "basic-auth-user"
     docker secret inspect $user_secret 2>&1 | out-null
     if($?)
@@ -13,7 +26,6 @@ if (Get-Command docker -errorAction SilentlyContinue)
     }
     else
     {
-            $user = Read-Host 'Admin User?'
         $user | docker secret create $user_secret -
     }
 
@@ -25,20 +37,30 @@ if (Get-Command docker -errorAction SilentlyContinue)
     }
     else
     {
-            $pass = Read-Host 'Password?' -AsSecureString
+        $secret | docker secret create $password_secret -
-            [Runtime.InteropServices.Marshal]::PtrToStringAuto([Runtime.InteropServices.Marshal]::SecureStringToBSTR($pass)) | docker secret create $password_secret -
+        Write-Host "[Credentials]"
+        Write-Host " username: admin"
+        Write-Host " password: $secret"
+        Write-Host " Write-Output `"$secret`" | faas-cli login --username=$user --password-stdin"
+    }
+    
+    if ($noAuth -Or $n) {
+        Write-Host ""
+        Write-Host "Disabling basic authentication for gateway.."
+        Write-Host ""
+        $env:BASIC_AUTH="false";
+    }
+    else 
+    {
+        Write-Host ""
+        Write-Host "Enabling basic authentication for gateway.."
+        Write-Host ""
     }
 
     Write-Host "Deploying stack"
     docker stack deploy func --compose-file ./docker-compose.yml
-    
 }
 else
 {
-        Write-Host "Docker not in swarm mode, please initialise the cluster (`docker swarm init`) and retry"
+    throw "Unable to find docker command, please install Docker (https://www.docker.com/) and retry"
-    }
-}
-else
-{
-    Write-Host "Unable to find docker command, please install Docker (https://www.docker.com/) and retry"
 }