Imports System.IO
Imports System.Net
Imports Newtonsoft.Json
Imports Newtonsoft.Json.Linq

Module Module1

	' The authentication key (API Key).
	' Get your own by registering at https://app.pdf.co
	Const API_KEY As String = "*****************************"

	' Source PDF file url
    ' You can also upload your own file into PDF.co and use it as url. Check "Upload File" samples for code snippets: https://github.com/bytescout/pdf-co-api-samples/tree/master/File%20Upload/   
	Const SourceFileUrl As String = "https://bytescout-com.s3-us-west-2.amazonaws.com/files/demo-files/cloud-api/pdf-security/ProtectedPDFFile.pdf"

	' The owner/user password to open file And to remove security features
	Const PDFFilePassword As String = "admin@123"

	' Destination file
	Const DestinationFile As String = "./unprotected.pdf"

	Sub Main()

		' Runs processing asynchronously. 
		' Returns Use JobId that you may use with /job/check to check state of the processing (possible states: working, failed, aborted And success).
		Dim async As Boolean = False

		' Create standard .NET web client instance
		Dim webClient As WebClient = New WebClient()

		' Set API Key
		webClient.Headers.Add("x-api-key", API_KEY)

		' Set JSON content type
		webClient.Headers.Add("Content-Type", "application/json")

		' URL of "Remove PDF Security" endpoint
		Dim url As String = "https://api.pdf.co/v1/pdf/security/remove"

		' Prepare requests params as JSON
		' See documentation: https : //apidocs.pdf.co
		Dim parameters As New Dictionary(Of String, Object)
		parameters.Add("name", Path.GetFileName(DestinationFile))
		parameters.Add("url", SourceFileUrl)
		parameters.Add("password", PDFFilePassword)
		parameters.Add("async", async)

		' Convert dictionary of params to JSON
		Dim jsonPayload As String = JsonConvert.SerializeObject(parameters)

		Try
			' Execute POST request with JSON payload
			Dim response As String = webClient.UploadString(url, jsonPayload)

			' Parse JSON response
			Dim json As JObject = JObject.Parse(response)

			If json("error").ToObject(Of Boolean) = False Then

				' Get URL of generated PDF file
				Dim resultFileUrl As String = json("url").ToString()

				' Download PDF file
				webClient.DownloadFile(resultFileUrl, DestinationFile)

				Console.WriteLine("Generated PDF file saved as ""{0}"" file.", DestinationFile)

			Else
				Console.WriteLine(json("message").ToString())
			End If

		Catch ex As WebException
			Console.WriteLine(ex.ToString())
		End Try

		webClient.Dispose()

		Console.WriteLine()
		Console.WriteLine("Press any key...")
		Console.ReadKey()

	End Sub

End Module