PowerShell Query to calculate MD5 and add to an audit file.

Actually two issues. I want to calculate checksum of files I'm receiving based on the contents of an audit file we receive. The audit file has a filename, row count, MD5 checksum from the source and I want to calculate the MD5 on our end and add it to the audit file.
First issue is I'm trying to read the file as a stream, but getting the error:
Get-FileHash : A parameter cannot be found that matches parameter name 'inputstream'.
The code is:
$stream = [System.IO.File]::OpenRead('D:\Input\account_data.txt')
$hash = Get-FileHash -inputstream $stream -Algorithm MD5
$stream.Close()

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I am running v4.0 of PowerShell. It works using a file path, but some of our files could be quite large and I'd rather use a stream to avoid memory issues.

The second is how to add the calculated value to the end of the proper row and maintain the original format of the audit file (with the exception of adding our calculated checksum.

The code I'm using for that is:
$AuditContents = import-csv $AuditPathAndName -Delimiter "|" -Header filename,rowcount,source_checksum

ForEach ($row in $AuditContents) {
    $file = $DataInputPath + $row.filename
    $fileHash = Get-FileHash -Path $file -Algorithm MD5
    $hash = $fileHash.Hash
    # add code here to add 'our' checksum to the row.
    }

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So, if a certain row of incoming data had the following:
account_data.txt|1234|593D6592BD9B7F9174711AB136F5E751
and I'm processing account_data.txt, then after running my code, I would want the audit file to contain:
account_data.txt|1234|593D6592BD9B7F9174711AB136F5E751|593D6592BD9B7F9174711AB136F5E751

There are about 10 files listed in the audit file that will be processed. It is also important that each row in the audit file be terminated with just a linefeed if possible.
LVL 15
dbbishopAsked:
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Jose Gabriel Ortega CCEO J0rt3g4 Consulting ServicesCommented:
It's not a tweak. You can use the script like this: script.ps1 -AuditPathAndName "D:\path\To\File.csv" -TxtFilePath="D:\path\folder\text.txt"
I did it like that to test in my own environment to test.
you can change the parameters to mandatory =$true. I just let them as "Optional parameters" to test you can modify it whatever you want.

The function is called in line 43
$Hash=  Get-Hash $AuditPathAndName $TxtFilePath

Please review the code I've provided.
2 Parameters:
In the code you provided you had "hard-coded" the 2 files:
 $stream = [System.IO.File]::OpenRead($FilePath)

$stream = [System.IO.File]::OpenRead('D:\Input\account_data.txt')
$hash = Get-FileHash -inputstream $stream -Algorithm MD5
$stream.Close()

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TXT file is hardcoded ( parameter 1).
In the 1st line of your second code snipet.
$AuditContents = import-csv $AuditPathAndName -Delimiter "|" -Header filename,rowcount,source_checksum

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$AuditPathAnName was never defined in the piece of code you provided.


Well nvm, Line 26 forgot to change it, no big deal. My last answer would be.

[CmdletBinding()]
param(
    [Parameter(Mandatory=$true,Position=0,ValueFromPipeline=$true)]$AuditPathAndName,
    [Parameter(Mandatory=$false,Position=1)]$OutputFileName="outputFileName.csv"
)

$global:ScriptLocation = $(get-location).Path

function Get-Hash{
    [CmdletBinding()]
    param(
        [Parameter(Mandatory=$true,Position=0,ValueFromPipeline=$true)]$AuditPathName,
        [Parameter(Mandatory=$true,Position=1,ValueFromPipeline=$true)]$RowFromAuthContent,
        [Parameter(Mandatory=$false,Position=2)]$PathToFiles
    )
    begin{

        if(!(Test-Path "$AuditPathName")){
            Write-Error "The CSV file couldn't be found at $AuditPathName"
            exit
        }
        if(!($PathToFiles)){
           $PathToFiles=$global:ScriptLocation
        }

        $PathToFiles="$PathToFiles\$($RowFromAuthContent.FileName)"
        if(!(Test-Path $PathToFiles)){
            Write-Error "The file doesn't exits $PathToFiles"
            exit
        }
    }
    process{
        try{
            $stream = [System.IO.File]::OpenRead($PathToFiles)
            $hash = Get-FileHash -inputstream $stream -Algorithm MD5
            $stream.Close()
        }
        catch{
            Write-Error "There was an error while calculating the MD5 hash with the message: $($_.exception.Message)"
            exit
        }
    }
    end{
        return $hash
    }
}

$AuditContents = Import-Csv $AuditPathAndName -Delimiter '|' -Header filename,rowcount,source_checksum

ForEach ($row in $AuditContents) {
    $Hash=  Get-Hash $AuditPathAndName $row
    $row| Add-Member -Name "InternalCheckSum" -Value $Hash.Hash -MemberType NoteProperty
}

$AuditContents | ConvertTo-Csv -Delimiter '|' -NoTypeInformation | % {$_.Replace('"','')} | Out-File "$global:ScriptLocation\$OutputFileName"

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0
 
Jose Gabriel Ortega CCEO J0rt3g4 Consulting ServicesCommented:
Just change lines 3 and 4.

[CmdletBinding()]
param(
    [Parameter(Mandatory=$false,Position=0,ValueFromPipeline=$true)]$AuditPathAndName="D:\lib\Desktop\text.csv",
    [Parameter(Mandatory=$false,Position=1,ValueFromPipeline=$true)]$TxtFilePath="D:\lib\Desktop\text.txt"
)

function Get-Hash{
    [CmdletBinding()]
    param(
        [Parameter(Mandatory=$true,Position=0,ValueFromPipeline=$true)]$AuditPathName,
        [Parameter(Mandatory=$true,Position=1,ValueFromPipeline=$true)]$FilePath
    )
    begin{
        if(!(Test-Path "$AuditPathName")){
            Write-Error "The CSV file couldn't be found at $AuditPathName"
            exit
        }

        if(!(Test-Path "$FilePath")){
            Write-Error "The file doesn't exits $FilePath"
            exit
        }
    }
    process{
        try{
            $stream = [System.IO.File]::OpenRead('D:\lib\Desktop\text.txt')
            $hash = Get-FileHash -inputstream $stream -Algorithm MD5
            $stream.Close()
        }
        catch{
            Write-Error "There was an error while calculating the MD5 hash with the message: $($_.exception.Message)"
            exit
        }
    }
    end{
        return $hash
    }
}

$AuditContents = import-csv $AuditPathAndName -Delimiter '|' -Header filename,rowcount,source_checksum

ForEach ($row in $AuditContents) {
    $Hash=  Get-Hash $AuditPathAndName $TxtFilePath
    $row| Add-Member -Name "InternalCheckSum" -Value $Hash.Hash -MemberType NoteProperty
}

$AuditContents | ConvertTo-Csv -Delimiter '|' -NoTypeInformation | % {$_.Replace('"','')} | Out-File "D:\lib\Desktop\here2.csv"

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This works for a single file and a single row

And about error1, the file must exist and be accessible to the command to work.
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dbbishopAuthor Commented:
A few tweaks (you have 'D:\lib\Desktop\text.txt' hard-coded as the file to compute the hash from but the filename should be coming from the audit file. I'm sure that was just an oversight and that is supposed to be $FilePath).
I'm not sure why two parameters are required to the function. I would think all that is required is the full path to the file I want to acquire the hash from. The only thing I see being done with $AuditPathName is checking if it exists, and if it didn't the function would never be called, since the foreach is passing rows from it.

I think I can make my existing code work from this, only a couple of things: Is there a way to create an output file that has row terminator of just LF. The output from Out-File terminates rows with CRLF. I've currently got the following as the last line of code:
$AuditContents | ConvertTo-Csv -Delimiter '|' -NoTypeInformation | % {$_.replace('"','')} | select -skip 1 | Out-File "D:\NewAudit.txt"

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to supress the header row.
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dbbishopAuthor Commented:
I had already got it working. My last was just mainly a comment except for how to terminate lines with just a linefeed and not CRLF. Any help there?
0
 
Jose Gabriel Ortega CCEO J0rt3g4 Consulting ServicesCommented:
I don't really know what you mean by a "lineFeed"
Do you want to have all of that in a single line?
0
 
dbbishopAuthor Commented:
Each line of text data is terminated with either a CRLF (typically in Windows systems) or just a LF (Unix systems). This data comes in with just LF but when I write the calculated MD% value and create a new file, out-file terminates each line with a CRLF. I want to terminate it with just a line feed.
0
 
dbbishopAuthor Commented:
This worked for calculating the hash. I was able to change my format file to expect CR-LF instead of just LF, so that part is okay. Wish I could have figured out how to write the output with just a linefeed.
0
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