2atWeb.psm1

#Requires -Version 4.0 -Modules 2atGeneral

$PSDefaultParameterValues.Clear()
Set-StrictMode -Version 2.0

$ErrorActionPreference = 'Stop'

Add-Type -Assembly System.Net.Http
Import-Module 2atGeneral

Function HashTableToDictionary {
    Param(
        [Parameter(Mandatory=$true)]
        [HashTable]$HashTable
    )
    
    $Dictionary = New-Object 'System.Collections.Generic.Dictionary[string,string]'
    $HashTable.Keys | %{ $Dictionary.Add($_, $HashTable[$_]) }
    $Dictionary
}

Function Get-WebResponseString {
    Param(
        [Parameter(Mandatory=$true)]
        [PSCustomObject]$WebResponse
    )
    Get-CallerPreference -Cmdlet $PSCmdlet -SessionState $ExecutionContext.SessionState

    $headers = ($WebResponse.ResponseHeaders | %{ "$($_): $($WebResponse.ResponseHeaders[$_])" }) -join [Environment]::NewLine
    
    "HTTP/$($WebResponse.ProtocolVersion) $([int]$WebResponse.HTTPStatus) $($WebResponse.HTTPStatusDescription)
$headers
 
$($WebResponse.ResponseBody)"

}

Function Get-WebResponse {
    Param(
        [Parameter(Mandatory=$true)]
        [ValidateScript({(New-Object System.Uri $_)})]
        [string]$Url,

        [hashtable]$HostIPs = @{},

        [System.Net.CookieContainer]$CookieContainer,
        
        [string]$Method = 'GET',
        
        [object]$FormData,
        
        [System.Net.WebProxy]$Proxy,
        
        [System.Net.ICredentials]$Credentials,
        
        [string]$UserAgent
    )
    Get-CallerPreference -Cmdlet $PSCmdlet -SessionState $ExecutionContext.SessionState
    
    if ($FormData -And -Not ($FormData -is [HashTable] -or $FormData -is [System.Collections.Generic.Dictionary[string,string]])) { throw 'FormData must be either a HashTable or a Dictionary[string,string]' }

    $o = [ordered]@{
        DateTime=Get-Date
        Url=$Url
        Method=$Method
        HostHeader=$null
        FormData=$null
        WebRequestStatus=[System.Net.WebExceptionStatus]::Success
        WebRequestStatusDescription=$null
        ProtocolVersion=$null
        HTTPStatus=$null
        HTTPStatusDescription=$null
        ResponseHeaders=$null
        ResponseBody=$null
    }

    if ($HostIPs.Keys | ?{ $url -match "(https?://)($_)(/.*)" }) { 
        $req = [System.Net.WebRequest]::Create("$($Matches[1])$($HostIPs[$Matches[2]])$($Matches[3])")
        $o.HostHeader = $req.Host = $Matches[2]
    } else {
        $req = [System.Net.WebRequest]::Create($Url)
    }

    $req.AllowAutoRedirect = $false
    $req.UserAgent = $UserAgent
    $req.CookieContainer = $CookieContainer
    $req.Method = $Method
    $req.Proxy = $Proxy
    $req.Credentials = $Credentials
    
    $c = $null
    if ($FormData) {
        if ($FormData -is [HashTable]) { $FormData = HashTableToDictionary $FormData }
        
        $o.FormData = $FormData
        $c = New-Object System.Net.Http.FormUrlEncodedContent $FormData
        $req.ContentType = $c.Headers.ContentType.MediaType
    }
    
    $reader = $null
    $resp = $null
    try {
        $o.TotalTime = Measure-Command {
            $o.TimeToFirstByte = Measure-Command {
                try {
                    if ($c) {
                        Wait-Job $c.CopyToAsync($req.GetRequestStream())
                    }
                    $resp = $req.GetResponse()
                } catch [System.Net.WebException] {
                    $e = $_.Exception
                    
                    Write-Warning "$Method $Url : $($e.Status) - $($e.Message)"

                    $resp = $e.Response
                    $o.WebRequestStatus = $e.Status
                    $o.WebRequestStatusDescription = $e.Message
                }
            }
            if ($resp) {
                $encoding = if ($resp.CharacterSet) {
                    try {
                        [System.Text.Encoding]::GetEncoding($resp.CharacterSet)
                    } catch {
                        Write-Warning "$Method $Url : Invalid encoding $($resp.CharacterSet)"
                    }
                }
                if ($encoding) {
                    $reader = New-Object System.IO.StreamReader $resp.GetResponseStream(), $encoding
                } else {
                    $reader = New-Object System.IO.StreamReader $resp.GetResponseStream()
                }

                $o.ResponseBody = $reader.ReadToEnd()
            }
        }

        if ($resp) {
            $o.ProtocolVersion = $resp.ProtocolVersion
            $o.ResponseHeaders = $resp.Headers
            $o.HTTPStatus = $resp.StatusCode
            $o.HTTPStatusDescription = $resp.StatusDescription
        }

        [PSCustomObject]$o
    } finally {
        if ($reader) { $reader.Dispose() }
        if ($resp) { $resp.Dispose() }
    }
}

Export-ModuleMember -Function Get-*

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