Public/Get-SlackHistory.ps1
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function Get-SlackHistory { <# .SYNOPSIS Get history from a Slack channel .DESCRIPTION Get history from a Slack channel .PARAMETER Token Specify a token for authorization. See 'Authentication' section here for more information: https://api.slack.com/web Test tokens are a simple way to use this .PARAMETER Id One or more channel IDs to extract history from. .PARAMETER Before Return history from before this date .PARAMETER After Return history from after this date .PARAMETER Inclusive If specified, include history from the date specified in Before and/or After parameters .PARAMETER Count Number of messages to return per query. Defaults to 100. Max 1000 .PARAMETER Paging If specified, and more data is available with a given 'Count', continue querying Slack until we have retrieved all the data available. WARNING: This parameter is experimental .PARAMETER MaxQueries Limit the count of API queries to this number. Only used if you enable -Paging .PARAMETER Raw If specified, we provide raw output and do not parse any responses .FUNCTIONALITY Slack #> [cmdletbinding()] param ( $Token = $Script:PSSlack.Token, [parameter( ValueFromPipelineByPropertyName = $True)] # a bit iffy... ID is common... [Alias('ID')] [string[]]$ChannelID, [ValidateRange(1,1000)] [int]$Count = 100, [switch]$Inclusive, [datetime]$Before, [datetime]$After, [switch]$Paging, [int]$MaxQueries, [switch]$Raw ) begin { function Get-UnixTime { param($Date) $unixEpochStart = new-object DateTime 1970,1,1,0,0,0,([DateTimeKind]::Utc) [int]($Date.ToUniversalTime() - $unixEpochStart).TotalSeconds } Write-Verbose "$($PSBoundParameters | Out-String)" $body = @{ channel = $null count = $count } if($Paging) { $PageDirection = 'Backward' } $BeforeTS = $null $AfterTS = $null if($PSBoundParameters.ContainsKey('Before')) { $BeforeTS = Get-UnixTime -Date $Before $body.add('latest', $BeforeTS) } if($PSBoundParameters.ContainsKey('After')) { $AfterTS = Get-UnixTime -Date $After $body.add('oldest', $AfterTS) if(-not $PSBoundParameters.ContainsKey('Before') -and $Paging) { $PageDirection = 'Forward' } } if($Inclusive) { $body.add('inclusive', 1) } $params = @{ Token = $Token Method = 'channels.history' Body = $body } $Queries = 1 } process { foreach($ID in $ChannelID) { $has_more = $false $Params.body.channel = $ID do { if($has_more) { if($Params.Body.oldest) { [void]$Params.Body.remove('oldest') } if($Params.Body.latest) { [void]$Params.Body.remove('latest') } if($PageDirection -eq 'Forward') { $ts = $response.messages.ts | sort | Select -last 1 $Params.body.oldest = $ts Write-Debug "Paging Forward.`n$( [pscustomobject]@{ After = $After Before = $Before LastTS = $response.messages[-1].ts SortLast = $response.messages.ts | sort | Select -last 1 SortFirst = $response.messages.ts | sort | Select -first 1 ts = $ts } | Out-String )" } elseif($PageDirection -eq 'Backward') { $ts = $response.messages[-1].ts if($AfterTS -and $ts -lt $AfterTS) { Write-Debug "TS is less than AfterTS, breaking!" break } $Params.body.latest = $ts Write-Debug "Paging Forward.`n$( [pscustomobject]@{ After = $After Before = $Before LastTS = $response.messages[-1].ts SortLast = $response.messages.ts | sort | Select -last 1 SortFirst = $response.messages.ts | sort | Select -first 1 ts = $ts } | Out-String )" } $has_more = $false Write-Debug "Body is now:$($params.body | out-string)" } $response = Send-SlackApi @params Write-Debug "$($Response | Format-List -Property * | Out-String)" if ($response.ok) { if($response.psobject.properties.name -contains 'has_more' -and $response.has_more) { Write-Debug 'Paging engaged!' $has_more = $true } if($Raw) { $link = "$($Script:PSSlack.ArchiveUri)/$($response.channel)/p$($response.ts -replace '\.')" $response | Add-Member -MemberType NoteProperty -Name link -Value $link $response } else { #Order our messages appropriately according to page direction if($Paging -and $PageDirection -eq 'Forward') { Parse-SlackMessage -InputObject $Response | Sort TimeStamp } else { Parse-SlackMessage -InputObject $Response } } } else { $response } $Queries++ } until ( -not $Paging -or -not $has_more -or ($MaxQueries -and $Queries -gt $MaxQueries) ) } } } |