Functions/Submit-SlackMessage.ps1
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<#
.SYNOPSIS This function posts a message to a channel in Slack. .DESCRIPTION This function posts a message to a channel in Slack. The scope required to call this function is "chat:write:user". #> function Submit-SlackMessage { [CmdletBinding(PositionalBinding=$false)] [OutputType([Bool])] param( # The authentication token for Slack [Parameter(Mandatory=$true)] [ValidateNotNullOrEmpty()] [String]$token, # The name of the channel [Parameter(Mandatory=$true)] [ValidateNotNullOrEmpty()] [String]$channelName, # The message to post [Parameter(Mandatory=$true)] [ValidateNotNullOrEmpty()] [String]$message ) # 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/chat.postMessage" Method = "POST" Headers = @{ "Content-Type" = "application/json" Authorization = "Bearer $($token)" } Body = @{ channel = "$($channelID)" text = "$($message)" } | ConvertTo-Json } # Invoke the call $response = Invoke-RestMethod @invokeRestMethodParams # Verify that the message is post if ($response.ok) { return $true } else { throw "Failed to post message '$($message)' to channel '$($channelName)' with the error message:`r`n$($response.error)." return $false } } |