add windows npm usage example

Vagrantfile

@@ -53,6 +53,7 @@ Vagrant.configure(2) do |config|
     config.vm.provision :shell, path: 'provision/windows/ps.ps1', args: ['provision-base.ps1', nexus_domain]
     config.vm.provision :shell, path: 'provision/windows/ps.ps1', args: ['use-chocolatey-repository.ps1', nexus_domain]
     config.vm.provision :shell, path: 'provision/windows/ps.ps1', args: ['use-powershell-repository.ps1', nexus_domain]
+    config.vm.provision :shell, path: 'provision/windows/ps.ps1', args: ['use-npm-repository.ps1', nexus_domain]
   end
 
   config.trigger.before :up, :vm => ['nexus'] do

provision/windows/export-windows-ca-certificates.ps1

@@ -0,0 +1,16 @@
+# dump all the windows trusted roots into a ca file.
+$pems = New-Object System.Text.StringBuilder
+Get-ChildItem Cert:\LocalMachine\Root | ForEach-Object {
+    # $_ is-a System.Security.Cryptography.X509Certificates.X509Certificate2
+    Write-Host "Exporting the $($_.Issuer) certificate..."
+    [void]$pems.AppendLine('-----BEGIN CERTIFICATE-----')
+    [void]$pems.AppendLine(
+        [Convert]::ToBase64String(
+            $_.Export('Cert'),
+            'InsertLineBreaks'));
+    [void]$pems.AppendLine("-----END CERTIFICATE-----");
+}
+Set-Content `
+    -Encoding Ascii `
+    C:\ProgramData\ca-certificates.crt `
+    $pems.ToString()

provision/windows/use-npm-repository.ps1

@@ -0,0 +1,117 @@
+param(
+    [string]$nexusDomain = 'nexus.example.com'
+)
+
+function external([string]$cmd, [string[]]$arguments) {
+    $eap = $ErrorActionPreference
+    $ErrorActionPreference = 'Continue'
+    try {
+        &$cmd @arguments
+        if ($LASTEXITCODE) {
+            throw "$cmd failed with exit code $LASTEXITCODE"
+        }
+    } finally {
+        $ErrorActionPreference = $eap
+    }
+}
+function node { external node.exe $Args }
+function npm { external npm.cmd $Args }
+
+cd $env:USERPROFILE
+mkdir tmp | Out-Null
+mkdir tmp/use-npm-repository | Out-Null
+cd tmp/use-npm-repository
+
+#
+# test the npm repositories.
+# see https://help.sonatype.com/display/NXRM3/Node+Packaged+Modules+and+npm+Registries
+# see https://docs.npmjs.com/private-modules/ci-server-config
+# see https://docs.npmjs.com/cli/adduser
+
+# install node LTS.
+choco install -y nodejs-lts
+Import-Module C:\ProgramData\chocolatey\helpers\chocolateyInstaller.psm1
+Update-SessionEnvironment
+node --version
+npm --version
+
+# configure npm to trust our system trusted CAs.
+# NB never turn off ssl verification with npm config set strict-ssl false
+c:\vagrant\provision\windows\export-windows-ca-certificates.ps1
+npm config set cafile c:/ProgramData/ca-certificates.crt
+
+#
+# configure npm to use the npm-group repository.
+
+npm config set registry https://$nexusDomain/repository/npm-group/
+
+# install a package that indirectly uses the npmjs.org-proxy repository.
+mkdir hello-world-win-npm | Out-Null
+pushd hello-world-win-npm
+Set-Content `
+    -Encoding Ascii `
+    package.json `
+    @'
+{
+  "name": "hello-world-win",
+  "description": "the classic hello world",
+  "version": "1.0.0",
+  "license": "MIT",
+  "main": "hello-world-win.js",
+  "repository": {
+    "type": "git",
+    "url": "https://git.example.com/hello-world-win.git"
+  },
+  "dependencies": {}
+}
+'@
+Set-Content `
+    -Encoding Ascii `
+    hello-world-win.js `
+    @'
+const leftPad = require('left-pad')
+console.log(leftPad('hello world', 40))
+'@
+npm install --save left-pad
+node hello-world-win.js
+
+#
+# publish a package to the npm-hosted repository.
+
+# login.
+$env:NPM_USER='alice.doe'
+$env:NPM_PASS='password'
+$env:NPM_EMAIL='alice.doe@example.com'
+$env:NPM_REGISTRY="https://$nexusDomain/repository/npm-hosted/"
+npm install npm-registry-client@8.5.0
+$env:NODE_PATH="$PWD/node_modules"
+$env:NODE_EXTRA_CA_CERTS='C:\ProgramData\ca-certificates.crt'
+$npmAuthToken = node --use-openssl-ca /vagrant/provision/npm-login.js 2>$null
+npm set "//$nexusDomain/repository/npm-hosted/:_authToken" $npmAuthToken
+
+# publish.
+npm publish --registry=$env:NPM_REGISTRY
+popd
+
+# use the published package.
+mkdir use-hello-world-win-npm | Out-Null
+pushd use-hello-world-win-npm
+Set-Content `
+    -Encoding Ascii `
+    hello-world-win.js `
+    @'
+{
+  "name": "use-hello-world-win",
+  "description": "use the classic hello world",
+  "version": "1.0.0",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://git.example.com/use-hello-world-win.git"
+  },
+  "dependencies": {}
+}
+'@
+npm install hello-world-win
+node node_modules/hello-world-win/hello-world-win.js
+popd