Reads s3 access logs from piped input and outputs powershell objects that can then be grouped/sorted

Read-S3Log.ps1

$pat = '(?<BucketOwner>\S+) (?<BucketName>\S+) \[(?<Time>.*?)] (?<RemoteIp>\S+) (?<Requester>\S+) (?<RequestId>\S+) (?<Operation>\S+) (?<ObjectKey>\S+) (?<RequestUri>"([^"]+))" (?<HttpStatus>\S+) (?<ErrorCode>\S+) (?<BytesSent>\S+) (?<ObjectSize>\S+) (?<TotalTime>\S+) (?<TurnaroundTime>\S+) (?<Referrer>\S+) (?<UserAgent>"([^"]+)") (?<VersionId>\S+)'

$regEx = New-Object System.Text.RegularExpressions.Regex($pat)

$dict = @{}

$names = $regEx.GetGroupNames()
$indexes = $regEx.GetGroupNumbers()

for($i = 0; $i -lt $names.Length; $i++) {
    $dict.Add($names[$i],$indexes[$i])
}

Function Read-S3Log([Parameter(ValueFromPipeline=$true)][String[]] $Files) {

    
    Process {

            foreach ($f in $Files) {
    
                Get-Content $f | % {

                    $res = $regEx.Match($_)

                    $propsDict = @{}

                    foreach ($e in $dict.GetEnumerator()) {
                        if ($e.Key -match '\D') {
                            if ($e.Key -eq 'Time') {
                                $propsDict.Add($e.Key, [DateTime]::ParseExact(($res.Groups[$dict[$e.Key]].Value), 'dd/MMM/yyyy:HH:mm:ss zzz', $null))
                            }
                            else {
                                $propsDict.Add($e.Key, $res.Groups[$dict[$e.Key]].Value)
                            }
                
                        }
                    }

                    New-Object psobject -Property $propsDict
                }

        }
    }
}