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PowerShell Webserver that restarts when you edit the script.
#
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
$global:restart = $false
$sleep = 100
$counter = 0
function Test-IsWebserverRunning {
if(-not (((netstat -o -n -a ) -match "0.0.0.0:80").length -gt 0 ) ){
return $false
}
return $true
}
if( Test-IsWebserverRunning ) {
write-warning "There is a webserver already running on port 80"
return;
}
#run this elevated (because we use port 80)
If (-Not ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) {
$CommandLine = $MyInvocation.Line.Replace($MyInvocation.InvocationName, $MyInvocation.MyCommand.Definition)
Start-Process -FilePath PowerShell.exe -Verb Runas -WorkingDirectory (pwd) -ArgumentList "$CommandLine"
return
}
#serve content from the content folder.
$base = "$PSScriptRoot\content"
Get-EventSubscriber | Unregister-Event
# track if this script changes so we can restart.
$fsw = New-Object IO.FileSystemWatcher $PSScriptRoot, $MyInvocation.MyCommand.Name -Property @{IncludeSubdirectories = $false;NotifyFilter = [IO.NotifyFilters]'FileName, LastWrite';EnableRaisingEvents = $true }
$null = Register-ObjectEvent $fsw Changed -SourceIdentifier FileChanged -Action {
$global:restart = $true
}
Write-Host "`n---------------------[Listening on http://localhost]-----------------"
$listener = New-Object System.Net.HttpListener
$listener.Prefixes.Add('http://*:80/')
$listener.Start()
function Make-Safe {
param ([string]$str )
return ($str -replace '/','\' -replace '\\\\','\' -replace '[^\d\w\[\]_\-\.\\]','-' -replace '--','-').Trim("\/- ")
}
function Get-LocalFilename {
param( [Uri]$url )
$h = make-safe $url.host
$path = make-safe $url.LocalPath
# $query = make-safe $url.Query
$local = "$base\$path"
$local = $local.Trim("\");
if( test-path $local ) {
return (resolve-path $local)
}
return $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($local)
}
function Send-TextResponse {
param ($response, $content)
$buffer = [System.Text.Encoding]::UTF8.GetBytes($content)
$response.ContentLength64 = $buffer.Length
$len = $buffer.length
Write-Progress -Activity "Listening..." -PercentComplete $counter -CurrentOperation "Sending $len bytes " -Status "Sending Response."
$response.OutputStream.Write($buffer, 0, $buffer.Length)
}
function Send-FileResponse {
param ($response, $file)
$content = (get-content $file -raw -encoding byte)
$response.ContentLength64 = $content.Length
if( test-path "$file.ContentType" ) {
$response.ContentType=(get-content "$file.ContentType")
}
$len = $buffer.length
Write-Progress -Activity "Listening..." -PercentComplete $counter -CurrentOperation "Sending $len bytes " -Status "Sending Response."
if( $content ) {
$response.OutputStream.Write($content, 0, $content.Length)
}
}
$task = $null
while ($listener.IsListening)
{
Write-Progress -Activity "Listening..." -PercentComplete $counter -CurrentOperation "not busy" -Status "Waiting For Request."
if( $task -eq $null ) {
$task = $listener.GetContextAsync()
}
if( $task.IsCompleted ) {
Write-Progress -Activity "Listening..." -PercentComplete $counter -CurrentOperation "processing" -Status "Request Accepted."
$context = $task.Result
$task = $null
#$task = $listener.GetContextAsync()
$requestUrl = $context.Request.Url
$response = $context.Response
Write-Host ''
Write-Host "> $requestUrl"
$localPath = $requestUrl.LocalPath
$localPath = ($localPath) -replace '//','/'
# special cases
if ($localPath -eq "/about" ) {
Send-TextResponse $response "running"
$response.Close()
continue;
}
if ($localPath -eq "/quit" ) {
Write-Host "`nQuitting..."
$response.Close()
break;
}
if ($localPath -eq "/restart" ) {
$global:restart = $true
$response.Close()
break;
}
$filePath = Get-LocalFilename $requestUrl
Write-Host ">>>> $filePath "
if( test-path $filePath ) {
$filePath = (resolve-path $filePath).Path
Send-FileResponse $response $filePath
} else {
$response.StatusCode = 404
}
$response.Close()
$responseStatus = $response.StatusCode
Write-Host "< $responseStatus"
}
if( $global:restart ) {
break;
} else {
$counter += 0.1
if( $counter -gt 100 ){
$counter = 0
}
Sleep -Milliseconds $sleep
}
}
Get-EventSubscriber | Unregister-Event
$listener.Stop()
if( $global:restart ) {
Write-Host "`nRestarting"
. "$PSScriptRoot\$($MyInvocation.MyCommand.Name)"
} else {
Write-Host "`nFinished."
}
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