Monthly Archives: July 2015

PS – download of csv-files of a folder from Sharepoint via webclient

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In this example the assumption is that you don´t have a Sharepoint server on which you could use the Sharepoint commandlets. So only the standard webclient functions were used to allow you to download all files. Also you need some valid credentials to log onto the Sharepoint website otherwise you would get the error 401 (not authorized).

Here is the code herefore:


<# 
.Synopsis 
Download all files from a sharepoint folder. 
.DESCRIPTION 
download all files from a sharepoint aspx-site. 
.EXAMPLE 
$credentials=Get-Credential -Credential Domäne\Benutzer 
[string]$sharepointURL = 'https://domäne.de/ExportOrdner/Forms/Overview.aspx' Download-AllFilesFromSP -SP_ASPX_Page $sharepointURL -DestinationFolder 'C:\ExportDirectory' -Credentials $credentials 
.INPUTS SP_ASPX_Page - aspx-site DestinationFolder target  CredentialsSP - authentication 
.FUNCTIONALITY 
Web; Sharepoint; Download 
#>
  function Download-AllCSVFilesFromSP
        {
            PARAM (
                [parameter(Mandatory=$true)]
                $SP_ASPX_Page,
                [parameter(Mandatory=$true)]
                $DestinationFolder,
                [parameter(Mandatory=$true)]
                $CredentialsSP
            )

            #create Object            
            $webclient = New-Object System.Net.WebClient 

            #set credentials
            $webclient.Credentials = $CredentialsSP 
            
            #retrieve content
            $response = Invoke-WebRequest -Uri $SP_ASPX_Page -Credential $CredentialsSP -Method Get

            #parse content parsen and search for export-files
            $matches =[regex]::Matches($response.content,'(\sUrl=\")+[0-9,a-z,A-Z\/_-]*(.csv\"\s)') 

            #foreach found file
            foreach ($item in $matches)
            {
                    #clean the download string             
                    $downloadFileURL = ($item.Groups[0].Value).Split('"')[1]

                    #extract the domain
                    $UrlDomain = ([regex]::Matches($SP_ASPX_Page,'https://[0-9,a-z,A-Z_\-\.]*')).Value

                    #extract filename
                    $downloadFile = $downloadFileURL.Split('/')[-1]
                    
                    #download to destination folder
                    $webclient.downloadfile($UrlDomain + $downloadFileURL,  $DestinationFolder + '\' + $downloadFile) 
            }
        }

PS – remote execution of scripts

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In this post i want to show you some ways how to execute remote execution of scripts.

First the complicated way:

connect – set execution policy – copy script, execute, delete – roll back execution policy

$Computername=Name
#"Start Session"
$s = New-PSSession -ComputerName $Computername
#"Enable Script Execution on remote System..."
Invoke-Command -Session $s -scriptblock { Set-executionpolicy unrestricted }
#Copy Script
Copy-Item H:\Skript.ps1 \\$Computername\c$\temp\Skript.ps1
#"Start Script..."
Invoke-Command -Session $s -scriptblock { c:\temp\Skript.ps1 }
#Delete Script
Remove-Item \\$Computername\c$\Skript.ps1
#Disable Script Execution on remote System...
Invoke-Command -Session $s -scriptblock { Set-executionpolicy default }
#End Session
Remove-PSSession $s

Next we use Invoke-Command – the scriptfile is copied and executed within the command itself:

Invoke-Command -computer Computername -FilePath C:\Skript.ps1

Next code connects to a computer NOT using Kerberos. This can become necessary if you want to connect to computers outside your domain:

$Computername=Name

#Not using Kerberos:
cd WSMan:\localhost\Client
Set-Item trustedhosts $Computername -force
Restart-Service winrm
Invoke-Command Computername { #Skript in here#} -authentication negotiate -credential Get-Credential

Have fun with it.

~David

Virtual Labs

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Practice is important! This can be achieved in Microsoft Virtual Labs. It´s the perfect place to test your skills in an server environment. This servers are preconfigured and you have a specific target what you have to accomplish.

VLabs

Have fun with it!