Functions/Get-SlackMessage.ps1
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<#
.SYNOPSIS This function gets messages from a Slack channel. .DESCRIPTION This function gets messages from a Slack channel. The scope required to call this function is "channels:history". #> function Get-SlackMessage { [CmdletBinding(PositionalBinding=$false)] [OutputType([PSObject])] param( # The authentication token for Slack [Parameter(Mandatory=$true)] [ValidateNotNullOrEmpty()] [String]$token, # The name of the channel [Parameter(Mandatory=$true)] [ValidateNotNullOrEmpty()] [String]$channelName ) # Retrieve the ID for the specified channel and verify that the channel exists $channelID = (Get-SlackChannel -Token $token -ChannelName $channelName).id if (!$channelID) { throw "The channel '$($channelName)' cannot be found in Slack." } # Prepare the API call parameters $invokeRestMethodParams = @{ Uri = "https://slack.com/api/channels.history" Method = "GET" Headers = @{ "Content-Type" = "application/x-www-form-urlencoded" Authorization = "Bearer $($token)" } Body = @{ channel = "$($channelID)" } } # Invoke the call $response = Invoke-RestMethod @invokeRestMethodParams # Verify that the retrieval is successful if ($response.ok) { return $response.messages } else { throw "Failed to get messages from channel '$($channelName)' with the error message:`r`n$($response.error)." } } |