core/csv/Get-CsvData.ps1
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<#
The MIT License (MIT) Copyright (c) 2015 Objectivity Bespoke Software Specialists Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. #> function Get-CsvData { <# .SYNOPSIS Reads CSV file using specific encoding and running optional Validation and Transformation rules. .DESCRIPTION After CSV file is read, Validation phase is run, that is for each row $CsvValidationRules scriptblock is invoked, which returns array of string: - if the array is empty it is assumed the row is valid. - if the array is non-empty, it is assumed the row is invalid and the strings will be displayed after the Validation phase. Then, Transformation phase is run, that is for each row $CsvTransformationRules scriptblock is invoked, which returns a hashtable that is then passed as a final result. .PARAMETER CsvPath Path to input CSV file. .PARAMETER CsvDelimiter CSV delimiter in input CSV file. .PARAMETER CustomEncoding If specified, CSV file will be first reencoded to UTF-8 (to a temporary file). .PARAMETER CsvValidationRules A scriptblock invoked for each row that accepts [PSCustomObject]$CsvRow and [int]$CsvRowNum. It returns array of string. .PARAMETER CsvTransformRules A scriptblock ivoked for each row that accepts [PSCustomObject]$CsvRow and [int]$CsvRowNum. It returns hashtable. .EXAMPLE function Get-ValidationRules { [CmdletBinding()] [OutputType([string[]])] param( [Parameter(Mandatory = $true)] [PSCustomObject] $CsvRow, [Parameter(Mandatory = $true)] [int] $CsvRowNum ) $errors = @() $errors += Test-ColumnIsValid -Row $CsvRow -ColumnName 'Login' -NonEmpty -NotContains '?', ' ' $errors += Test-ColumnIsValid -Row $CsvRow -ColumnName 'Name' -NonEmpty -NotContains '?' $errors += Test-ColumnIsValid -Row $CsvRow -ColumnName 'First Name' -NonEmpty -NotContains '?', ' ' $errors += Test-ColumnIsValid -Row $CsvRow -ColumnName 'Last Name' -NonEmpty -NotContains '?' return $errors } function Get-TransformRules { [CmdletBinding()] [OutputType([hashtable])] param( [Parameter(Mandatory = $true)] [PSCustomObject] $CsvRow, [Parameter(Mandatory = $true)] [int] $CsvRowNum ) $result = @{ Name = Remove-DiacriticChars -String (($CsvRow.'Name')) FirstName = Remove-DiacriticChars -String (($CsvRow.'First Name')) LastName = Remove-DiacriticChars -String (($CsvRow.'Last Name')) Login = $CsvRow.Login } return $result } $csvParams = @{ CsvPath = 'test.csv' CsvDelimiter = ';' CsvValidationRules = (Get-Command -Name Get-ValidationRules).ScriptBlock CsvTransformRules = (Get-Command -Name Get-TransformRules).ScriptBlock CustomEncoding = 'Windows-1250' } $employeeData = Get-CsvData @csvParams #> [CmdletBinding()] [OutputType([hashtable[]])] param( [Parameter(Mandatory = $true)] [string] $CsvPath, [Parameter(Mandatory = $true)] [string] $CsvDelimiter, [Parameter(Mandatory = $false)] [string] $CustomEncoding, [Parameter(Mandatory = $false)] [scriptblock] $CsvValidationRules, [Parameter(Mandatory = $false)] [scriptblock] $CsvTransformRules ) if (!(Test-Path -LiteralPath $CsvPath)) { throw "Csv input file '$CsvPath' does not exist at $((Get-Location).Path)." } $tempFileName = '' try { if ($CustomEncoding) { $tempFileName = [System.IO.Path]::GetTempFileName() Convert-FileEncoding -Path $CsvPath -OutputPath $tempFileName -InputEncoding $CustomEncoding -OutputEncoding 'UTF-8' $csvFileToRead = $tempFileName } else { $csvFileToRead = $CsvPath } Write-Log -Info "Reading file '$csvFileToRead' using delimiter '$CsvDelimiter'" $inputData = Import-Csv -Path $csvFileToRead -Delimiter $CsvDelimiter -Encoding UTF8 if (!$inputData) { throw "There is no data to import. Please check file '$CsvPath'." } Write-Log -Info "Read $($inputData.Length) rows." $emptyRows = @() $rowNum = 2 foreach ($row in $inputData) { $isRowEmpty = $true foreach ($prop in $row.PSObject.Properties.Name) { $row.$prop = $row.$prop.Trim() if ($row.$prop) { $isRowEmpty = $false } } if ($isRowEmpty) { $emptyRows += $rowNum } $rowNum++ } if ($emptyRows) { Write-Log -Info "Ignoring empty row numbers: $($rowNum -join ', ')." } # Run Validation Rules if ($CsvValidationRules) { $errorArray = New-Object -TypeName System.Collections.ArrayList $rowNum = 2 Write-Log -Info 'Validating CSV data.' foreach ($row in $inputData) { if ($emptyRows -contains $rowNum) { $rowNum++ continue } try { $errors = Invoke-Command -ScriptBlock $CsvValidationRules -ArgumentList $row, $rowNum } catch { Write-ErrorRecord -ErrorRecord $_ } foreach ($err in $errors) { [void]($errorArray.Add("Validation error in row ${rowNum}: $err")) } $rowNum++ } if ($errorArray) { $msg = "`r`n" + ($errorArray -join "`r`n") Write-Log -Error $msg throw "Input CSV file has not passed validation rules. Please fix the file and try again." } } $added = 0 $ignored = 0 # Run Transformation Rules if ($CsvTransformRules) { $resultArray = New-Object -TypeName System.Collections.ArrayList $rowNum = 2 Write-Log -Info 'Transforming CSV data.' foreach ($row in $inputData) { if ($emptyRows -contains $rowNum) { $rowNum++ $ignored++ continue } try { $resultRow = Invoke-Command -ScriptBlock $CsvTransformRules -ArgumentList $row, $rowNum } catch { Write-ErrorRecord -ErrorRecord $_ } if ($resultRow) { [void]($resultArray.Add($resultRow)) $added++ } else { $ignored++ } $rowNum++ } Write-Log -Info "CSV file read successfully ($added rows returned, $ignored rows ignored)." return $resultArray } else { return $inputData } } finally { if ($tempFileName -and (Test-Path -Path $tempFileName)) { Remove-Item -Path $tempFileName -Force } } } |