Powershell HTTP Server

http.ps1

# Portable HTTP file server
# Should be somewhat safe but please don't actually use it.
# You can't exit this with CTRL+C directly and need to use the shutdown command below a directory listing,
# or you can kill the powershell process of course, but this causes the port to stay used sometimes.

# Features
# - Directory Browser
# - Can handle UTF8 URLs
# - Delivers unknown file types
# - /../ attack prevention

# Drawbacks
# - Only one request at a time
# - Only runs on localhost unless it has administrative rights
# - Files loaded completely into memory

Add-Type -AssemblyName System.Web

# Writes a string to a stream that expects a byte array
function Write-String {
	$b=[System.Text.Encoding]::UTF8.GetBytes($args[1])
	$args[0].Write($b,0,$b.Length)
}

# HTML Encoder
function Html-Encode {
	return [System.Web.HttpUtility]::HtmlEncode($args[0])
}

# URL Encoder
function Url-Encode {
	return [uri]::EscapeDataString($args[0])
}

# Prevent accidental exit
$nonce = [System.DateTime]::Now.Ticks

# Cheap Directory Jail
New-PSDrive -Name OhGodWhy -PSProvider FileSystem -Root $PWD.Path

# Create and start listener
$listener = New-Object System.Net.HttpListener
$listener.Prefixes.Add("http://localhost:55555/")
$listener.Start()

echo "Http: http://localhost:55555/"
echo "Path: $PWD"

# Open default browser
start "http://localhost:55555/"

# Be able to serve multiple requests
while($listener.IsListening){
	$Context = $listener.GetContext()
	$URL = $Context.Request.Url.LocalPath
	echo "Request: $URL"
	if(Test-Path "OhGodWhy:$URL" -PathType Leaf){
		echo "Requesting a File"
		# Is file, serve it
		$Content = Get-Content -Encoding Byte -Path "OhGodWhy:$URL" -ReadCount 0

		# This can throw an error on older versions of PowerShell but the web server will still work
		$Context.Response.ContentType = [System.Web.MimeMapping]::GetMimeMapping($URL)
		$Context.Response.ContentLength = $Content.Length

		# Write content as-is
		$Context.Response.OutputStream.Write($Content, 0, $Content.Length)
	} elseif (Test-Path "OhGodWhy:$URL" -PathType Container) {
		if($Context.Request.Url.Query -eq "?$nonce"){
			echo "Requesting Server Shutdown"
			# Stop listener
			$Context.Response.ContentType = "text/html"
			Write-String $Context.Response.OutputStream "<h1>The server has been shut down</h1>"
			$Context.Response.Close()
			# Give the component time to deliver the answer
			sleep 1
			$listener.Stop()
			return
		}else{
			echo "Requesting Directory listing"
			# Is directory, show contents
			$Context.Response.ContentType = "text/html; charset=utf-8"
			$Context.Response.ContentEncoding = [System.Text.Encoding]::UTF8

			# Make it look somewhat nice
			Write-String $Context.Response.OutputStream "<style>
*{font-family:monospace;font-size:14pt}
div a{text-decoration:none;display:inline-block;width:49%;padding:5px}
div a:hover{background-color:#FF0}
#sd{color:#F00;text-decoration:none;}</style>"
			Write-String $Context.Response.OutputStream "<h1>Directory Listing</h1><div>"

			# UP
			Write-String $Context.Response.OutputStream "<a href=""../"">&lt;UP&gt;</a><br />"

			# Directories above files
			Get-ChildItem "OhGodWhy:$URL" | Where-Object { $_.PSIsContainer } | Foreach-Object {
				$fn=[System.IO.Path]::GetFileName($_.FullName)
				$href=Url-Encode $fn
				$fn=Html-Encode $fn
				Write-String $Context.Response.OutputStream "<a href=""$href/"">$fn/</a>"
			}
			Get-ChildItem "OhGodWhy:$URL" | Where-Object { -not $_.PSIsContainer } | Foreach-Object {
				$fn=[System.IO.Path]::GetFileName($_.FullName)
				$href=Url-Encode $fn
				$fn=Html-Encode $fn
				Write-String $Context.Response.OutputStream "<a href=""$href"">$fn</a>"
			}

			# Shutdown
			Write-String $Context.Response.OutputStream "</div><hr/>[<a id=""sd"" href=""/?$nonce"">SHUTDOWN</a>]<hr/>"
		}
	} else {
		echo "HTTP 404"
		# Not found
		$Context.Response.StatusCode = 404;
		$Context.Response.ContentType = "text/plain";
		Write-String $Context.Response.OutputStream "$URL not found"
	}
	echo "Done"
	# Complete request
	$Context.Response.Close()
}

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As of 2018-12-15 it is signed with a valid certificate.

Tell me how to change the folder to which access is provided to the example D:\Pic

Access is provided to whatever folder your powershell currently points. To get access to "D:\Pic", go into that directory with powershell, then call the script

Hello,
Please add this Check to avoid throwing errors about ContentLength
I found that the Property is named ContentLength64 in my Powershell v5.1.19041.2364.

	if ($Context.Response.ContentLength -ne $null) {
		$Context.Response.ContentLength = $Content.Length
	} elseif ($Context.Response.ContentLength64 -ne $null) {
		$Context.Response.ContentLength64 = $Content.Length
	}