Private/Invoke-Method.ps1
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function Invoke-Method { <# .SYNOPSIS Extracted invokation of the REST method to own function. #> [CmdletBinding(SupportsPaging = $true)] [OutputType( [PSObject], [ConfluencePS.Page], [ConfluencePS.Space], [ConfluencePS.Label], [ConfluencePS.Icon], [ConfluencePS.Version], [ConfluencePS.User] )] param ( # REST API to invoke [Parameter(Mandatory = $true)] [Uri]$URi, # Method of the invokation [ValidateSet("GET", "POST", "PUT", "DELETE")] [string]$Method = "GET", # Body of the request [ValidateNotNullOrEmpty()] [string]$Body, # Additional headers [Hashtable]$Headers, # GET Parameters [Hashtable]$GetParameters, # Type of object to which the output will be casted to [ValidateSet( [ConfluencePS.Page], [ConfluencePS.Space], [ConfluencePS.Label], [ConfluencePS.Icon], [ConfluencePS.Version], [ConfluencePS.User] )] [System.Type]$OutputType, # Authentication credentials [Parameter(Mandatory = $true)] [PSCredential]$Credential ) BEGIN { Write-Verbose "[$($MyInvocation.MyCommand.Name)] Function started" # Validation of parameters if (($Method -in ("POST", "PUT")) -and (!($Body))) { $message = "The following parameters are required when using the ${Method} parameter: Body." $exception = New-Object -TypeName System.ArgumentException -ArgumentList $message Throw $exception } # pass input to local variable # this allows to use the PSBoundParameters for recursion $_headers = $Headers # Add Basic Authentication to Header $SecureCreds = [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes( $('{0}:{1}' -f $Credential.UserName, $Credential.GetNetworkCredential().Password) )) $_headers += @{ "Authorization" = "Basic $($SecureCreds)" 'Content-Type' = 'application/json; charset=utf-8' } } Process { # Append GET parameters to URi if (($PSCmdlet.PagingParameters) -and ($PSCmdlet.PagingParameters.Skip)) { $GetParameters["start"] = $PSCmdlet.PagingParameters.Skip } if ($GetParameters -and ($URi -notlike "*\?*")) { Write-Debug "Using `$GetParameters: $($GetParameters | Out-String)" [string]$URI += (ConvertTo-GetParameter $GetParameters) # Prevent recursive appends $GetParameters = $null } # set mandatory parameters $splatParameters = @{ Uri = $URi Method = $Method Headers = $_headers UseBasicParsing = $true ErrorAction = 'SilentlyContinue' } # set optional parameters # http://stackoverflow.com/questions/15290185/invoke-webrequest-issue-with-special-characters-in-json if ($Body) {$splatParameters["Body"] = [System.Text.Encoding]::UTF8.GetBytes($Body)} # load DefaultParameters for Invoke-WebRequest # as the global PSDefaultParameterValues is not used # TODO: find out why PSJira doesn't need this $script:PSDefaultParameterValues = $global:PSDefaultParameterValues # Invoke the API try { Write-Verbose "[$($MyInvocation.MyCommand.Name)] Invoking method $Method to URI $URi" Write-Debug "[$($MyInvocation.MyCommand.Name)] Invoke-WebRequest with: $($splatParameters | Out-String)" $webResponse = Invoke-WebRequest @splatParameters } catch { # Invoke-WebRequest is hard-coded to throw an exception if the Web request returns a 4xx or 5xx error. # This is the best workaround I can find to retrieve the actual results of the request. # This shall be fixed with PoSh v6: https://github.com/PowerShell/PowerShell/issues/2193 Write-Verbose "[$($MyInvocation.MyCommand.Name)] Failed to get an answer from the server" $webResponse = $_.Exception.Response } Write-Debug "[$($MyInvocation.MyCommand.Name)] Executed WebRequest. Access `$webResponse to see details" if ($webResponse) { Write-Verbose "[$($MyInvocation.MyCommand.Name)] Status code: $($webResponse.StatusCode)" if ($webResponse.StatusCode.value__ -ge 400) { Write-Warning "Confluence returned HTTP error $($webResponse.StatusCode.value__) - $($webResponse.StatusCode)" # Retrieve body of HTTP response - this contains more useful information about exactly why the error occurred $readStream = New-Object -TypeName System.IO.StreamReader -ArgumentList ($webResponse.GetResponseStream()) $responseBody = $readStream.ReadToEnd() $readStream.Close() Write-Verbose "[$($MyInvocation.MyCommand.Name)] Retrieved body of HTTP response for more information about the error (`$responseBody)" try { $responseObject = ConvertFrom-Json -InputObject $responseBody -ErrorAction Stop if ($responseObject.message) { Write-Error $responseObject.message } else {throw} } catch { Write-Error $responseBody } } else { if ($webResponse.Content) { # API returned a Content: lets work wit it $response = ConvertFrom-Json -InputObject $webResponse.Content if ($null -ne $response.errors) { Write-Verbose "[$($MyInvocation.MyCommand.Name)] An error response was received from; resolving" # This could be handled nicely in an function such as: # ResolveError $response -WriteError Write-Error $($response.errors | Out-String) } else { if ($PSCmdlet.PagingParameters.IncludeTotalCount) { [double]$Accuracy = 0.0 $PSCmdlet.PagingParameters.NewTotalCount($response.size, $Accuracy) } # None paginated results / first page of pagination $result = $response if (($response) -and ($response | Get-Member -Name results)) { $result = $response.results } if ($OutputType) { # Results shall be casted to custom objects (see ValidateSet) Write-Verbose "[$($MyInvocation.MyCommand.Name)] Outputting results as $($OutputType.FullName)" $converter = "ConvertTo-$($OutputType.Name)" $result | & $converter } else { $result } # Detect if result is paginated if ($response._links.next) { Write-Verbose "[$($MyInvocation.MyCommand.Name)] Invoking pagination" # Remove Parameters that don't need propagation $script:PSDefaultParameterValues.Remove("$($MyInvocation.MyCommand.Name):GetParameters") $script:PSDefaultParameterValues.Remove("$($MyInvocation.MyCommand.Name):IncludeTotalCount") # Self-Invoke function for recursion $parameters = @{ URi = "{0}{1}" -f $response._links.base, $response._links.next Method = $Method Credential = $Credential } if ($Body) {$parameters["Body"] = $Body} if ($Headers) {$parameters["Headers"] = $Headers} if ($OutputType) {$parameters["OutputType"] = $OutputType} Write-Verbose "NEXT PAGE: $($parameters["URi"])" Invoke-Method @parameters } } } else { # No content, although statusCode < 400 # This could be wanted behavior of the API Write-Verbose "[$($MyInvocation.MyCommand.Name)] No content was returned from." } } } else { Write-Verbose "[$($MyInvocation.MyCommand.Name)] No Web result object was returned from. This is unusual!" } } END { Write-Verbose "[$($MyInvocation.MyCommand.Name)] Function ended" } } |