functions/Get-WebFileName.ps1

# Copyright © 2017 - 2021 Chocolatey Software, Inc.
# Copyright © 2011 - 2017 RealDimensions Software, LLC
#
# 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.
#
# Based on http://stackoverflow.com/a/13571471/18475

function Get-WebFileName {
<#
.SYNOPSIS
Gets the original file name from a url. Used by Get-WebFile to determine
the original file name for a file.
 
.DESCRIPTION
Uses several techniques to determine the original file name of the file
based on the url for the file.
 
.NOTES
Available in 0.9.10+.
Falls back to DefaultName when the name cannot be determined.
 
Chocolatey works best when the packages contain the software it is
managing and doesn't require downloads. However most software in the
Windows world requires redistribution rights and when sharing packages
publicly (like on the community feed), maintainers may not have those
aforementioned rights. Chocolatey understands how to work with that,
hence this function. You are not subject to this limitation with
internal packages.
 
.INPUTS
None
 
.OUTPUTS
None
 
.PARAMETER Url
This is the url to a file that will be possibly downloaded.
 
.PARAMETER DefaultName
The name of the file to use when not able to determine the file name
from the url response.
 
.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.
 
.EXAMPLE
Get-WebFileName -Url $url -DefaultName $originalFileName
 
.LINK
Get-WebHeaders
 
.LINK
Get-ChocolateyWebFile
#>

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

  Write-FunctionCallLogMessage -Invocation $MyInvocation -Parameters $PSBoundParameters

  $originalFileName = $defaultName
  $fileName = $null

  if ($url -eq $null -or $url -eq '') {
    Write-Debug "Url was null, using default name."
    return $originalFileName
  }

  try {
    $uri = [System.Uri]$url
    if ($uri.IsFile()) {
      $fileName = [System.IO.Path]::GetFileName($uri.LocalPath)
      Write-Debug "Url is local file, returning fileName"

      return $fileName
    }
  } catch {
    #continue on
  }

  if ($url.StartsWith('ftp')) {
    Write-Debug "Url is FTP, using default name."
    return $originalFileName
  }

  $request = [System.Net.HttpWebRequest]::Create($url)
  if ($request -eq $null) {
    Write-Debug "Request was null, using default name."
    return $originalFileName
  }

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

  $client = New-Object System.Net.WebClient
  if ($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-Debug "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-Debug "Using system proxy server '$proxyaddress'."
    $proxy = New-Object System.Net.WebProxy($proxyAddress)
    $proxy.Credentials = $creds
    $proxy.BypassProxyOnLocal = $true
    $request.Proxy = $proxy
  }

  $request.Method = "GET"
  $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
  $request.UserAgent = $userAgent

  [System.Text.RegularExpressions.Regex]$containsABadCharacter = New-Object Regex("[" + [System.Text.RegularExpressions.Regex]::Escape([System.IO.Path]::GetInvalidFileNameChars() -join '') + "\=\;]");

  try
  {
    [System.Net.HttpWebResponse]$response = $request.GetResponse()
    if ($response -eq $null) {
      Write-Debug "Response was null, using default name."
      return $originalFileName
    }

    [string]$header = $response.Headers['Content-Disposition']
    [string]$headerLocation = $response.Headers['Location']

    # start with content-disposition header
    if ($header -ne '') {
      $fileHeaderName = 'filename='
      $index = $header.LastIndexOf($fileHeaderName, [StringComparison]::OrdinalIgnoreCase)
      if ($index -gt -1) {
        Write-Debug "Using header 'Content-Disposition' to determine file name."
        $fileName = $header.Substring($index + $fileHeaderName.Length).Replace('"', '')
      }
    }
    if ($containsABadCharacter.IsMatch($fileName)) { $fileName = $null }

    # If empty, check location header next
    if ($fileName -eq $null -or  $fileName -eq '') {
      if ($headerLocation -ne '') {
        Write-Debug "Using header 'Location' to determine file name."
        $fileName = [System.IO.Path]::GetFileName($headerLocation)
      }
    }
    if ($containsABadCharacter.IsMatch($fileName)) { $fileName = $null }

    # Next comes using the response url value
    if ($fileName -eq $null -or  $fileName -eq '') {
      $responseUrl = $response.ResponseUri.ToString()
      if (!$responseUrl.Contains('?')) {
        Write-Debug "Using response url to determine file name. '$responseUrl'"
        $fileName = [System.IO.Path]::GetFileName($responseUrl)
      }
    }
    if ($containsABadCharacter.IsMatch($fileName)) { $fileName = $null }

    # Next comes using the request url value
    if ($fileName -eq $null -or  $fileName -eq '') {
      $requestUrl = $url
      $extension = [System.IO.Path]::GetExtension($requestUrl)
      if (!$requestUrl.Contains('?') -and $extension -ne $null -and $extension -ne '') {
        Write-Debug "Using request url to determine file name. ' $requestUrl'"
        $fileName = [System.IO.Path]::GetFileName($requestUrl)
      }
    }

    # when all else fails, default the name
    if ($fileName -eq $null -or  $fileName -eq '' -or $containsABadCharacter.IsMatch($fileName)) {
      Write-Debug "File name is null or illegal. Using $originalFileName instead."
      $fileName = $originalFileName
    }

    Write-Debug "File name determined from url is '$fileName'"

    return $fileName
  } catch {
    if ($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()
    }

    Write-Debug "Url request/response failed - file name will be '$originalFileName': $($_)"

    return $originalFileName
  } finally {
   if ($response -ne $null) {
      $response.Close();
    }
  }
}

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