functions/Get-WebHeaders.ps1

# Copyright © 2017 - 2021 Chocolatey Software, Inc.
# Copyright © 2015 - 2017 RealDimensions Software, LLC
# Copyright © 2011 - 2015 RealDimensions Software, LLC & original authors/contributors from https://github.com/chocolatey/chocolatey
#
# 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.

function Get-WebHeaders {
<#
.SYNOPSIS
Gets the request/response headers for a url.
 
.DESCRIPTION
This is a low-level function that is used by Chocolatey to get the
headers for a request/response to better help when getting and
validating internet resources.
 
.INPUTS
None
 
.OUTPUTS
None
 
.PARAMETER Url
This is the url to get a request/response from.
 
.PARAMETER UserAgent
The user agent to use as part of the request. Defaults to 'chocolatey
command line'.
 
.PARAMETER IgnoredArguments
Allows splatting with arguments that do not apply. Do not use directly.
 
.LINK
Get-ChocolateyWebFile
 
.LINK
Get-WebFileName
 
.LINK
Get-WebFile
#>

param(
  [parameter(Mandatory=$false, Position=0)][string] $url = '',
  [parameter(Mandatory=$false, Position=1)][string] $userAgent = 'chocolatey command line',
  [parameter(ValueFromRemainingArguments = $true)][Object[]] $ignoredArguments
)

  Write-FunctionCallLogMessage -Invocation $MyInvocation -Parameters $PSBoundParameters

  if ($url -eq '') { return @{} }

  $request = [System.Net.HttpWebRequest]::Create($url);
  $defaultCreds = [System.Net.CredentialCache]::DefaultCredentials
  if ($defaultCreds -ne $null) {
    $request.Credentials = $defaultCreds
  }

  #$request.Method = "HEAD"
  $client = New-Object System.Net.WebClient
  if ($defaultCreds -ne $null) {
    $client.Credentials = $defaultCreds
  }

  # check if a proxy is required
  $explicitProxy = $env:chocolateyProxyLocation
  $explicitProxyUser = $env:chocolateyProxyUser
  $explicitProxyPassword = $env:chocolateyProxyPassword
  $explicitProxyBypassList = $env:chocolateyProxyBypassList
  $explicitProxyBypassOnLocal = $env:chocolateyProxyBypassOnLocal
  if ($explicitProxy -ne $null) {
    # explicit proxy
    $proxy = New-Object System.Net.WebProxy($explicitProxy, $true)
    if ($explicitProxyPassword -ne $null) {
      $passwd = ConvertTo-SecureString $explicitProxyPassword -AsPlainText -Force
      $proxy.Credentials = New-Object System.Management.Automation.PSCredential ($explicitProxyUser, $passwd)
    }

    if ($explicitProxyBypassList -ne $null -and $explicitProxyBypassList -ne '') {
      $proxy.BypassList =  $explicitProxyBypassList.Split(',', [System.StringSplitOptions]::RemoveEmptyEntries)
    }
    if ($explicitProxyBypassOnLocal -eq 'true') { $proxy.BypassProxyOnLocal = $true; }

    Write-Host "Using explicit proxy server '$explicitProxy'."
    $request.Proxy = $proxy

  } elseif ($client.Proxy -and !$client.Proxy.IsBypassed($url)) {
    # system proxy (pass through)
    $creds = [Net.CredentialCache]::DefaultCredentials
    if ($creds -eq $null) {
      Write-Debug "Default credentials were null. Attempting backup method"
      $cred = Get-Credential
      $creds = $cred.GetNetworkCredential();
    }
    $proxyAddress = $client.Proxy.GetProxy($url).Authority
    Write-Host "Using system proxy server '$proxyaddress'."
    $proxy = New-Object System.Net.WebProxy($proxyAddress)
    $proxy.Credentials = $creds
    $proxy.BypassProxyOnLocal = $true
    $request.Proxy = $proxy
  }

  $request.Accept = '*/*'
  $request.AllowAutoRedirect = $true
  $request.MaximumAutomaticRedirections = 20
  #$request.KeepAlive = $true
  $request.AutomaticDecompression = [System.Net.DecompressionMethods]::GZip -bor [System.Net.DecompressionMethods]::Deflate
  $request.Timeout = 30000
  if ($env:chocolateyRequestTimeout -ne $null -and $env:chocolateyRequestTimeout -ne '') {
    $request.Timeout =  $env:chocolateyRequestTimeout
  }
  if ($env:chocolateyResponseTimeout -ne $null -and $env:chocolateyResponseTimeout -ne '') {
    $request.ReadWriteTimeout =  $env:chocolateyResponseTimeout
  }

  #http://stackoverflow.com/questions/518181/too-many-automatic-redirections-were-attempted-error-message-when-using-a-httpw
  $request.CookieContainer = New-Object System.Net.CookieContainer
  if ($userAgent -ne $null) {
    Write-Debug "Setting the UserAgent to `'$userAgent`'"
    $request.UserAgent = $userAgent
  }

  Write-Debug "Request Headers:"
  foreach ($key in $request.Headers) {
    $value = $request.Headers[$key];
    if ($value) {
      Write-Debug " `'$key`':`'$value`'"
    } else {
      Write-Debug " `'$key`'"
    }
  }

  $headers = @{}
  try {
    $response = $request.GetResponse();
    Write-Debug "Response Headers:"
    foreach ($key in $response.Headers) {
      $value = $response.Headers[$key];
      if ($value) {
        $headers.Add("$key","$value")
        Write-Debug " `'$key`':`'$value`'"
      }
    }
  } catch {
    if ($request -ne $null) {
      $request.ServicePoint.MaxIdleTime = 0
      $request.Abort();
      # ruthlessly remove $request to ensure it isn't reused
      Remove-Variable request
      Start-Sleep 1
      [GC]::Collect()
    }

    throw "The remote file either doesn't exist, is unauthorized, or is forbidden for url '$url'. $($_.Exception.Message)"
  } finally {
   if ($response -ne $null) {
      $response.Close();
    }
  }

  $headers
}

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