如何正确地在断言中编写Groovy脚本以解码响应并将其接收为pdf？

Question

I'm trying to receive pdf document with conent from 'rest request' respons via assertion script. I was trying in few ways, but for each of them the result was diffrent then expected. Could you please review my few options and propose some solutions ? That's my first steps with 'groovy scripts' and I'm not so familiar with endcode/decode functionalities, so please be understanding if i made some huge mistakes Thanks in advance.

//Option number 1

import org.apache.commons.codec.binary.Base64; 
import groovy.json.JsonSlurper
import com.itextpdf.text.*
import com.itextpdf.text.pdf.PdfWriter;

def content = messageExchange.response.responseContent
def cont = messageExchange.response.responseContent
def fileName = messageExchange.modelItem.testStep.testCase.getPropertyValue("DOC") + '_test.pdf'
Base64 coder = new Base64();
//assert null != response, "response is null"
def encodedString = cont.getBytes("UTF-8").encodeBase64().toString()
def decoded = encodedString.decodeBase64();
def res = new File( "F:\\Test\\Testing\\Files\\assertion\\$fileName")
res.write(content, "UTF-8")
res.delete();
res << encodedString
log.info res

Result:

I'm expecting document with correct pdf content.

From Option 1 I'm able to received pdf file with content which is stil encoded liket this: "JVBERi0xLjQNCiXvv73vv73vv73vv70NCjEgMCBvYmoKPDwKL0F1dGhvciAoQW5ua2F0aHJpbi BTdGVwaGFuKQovQ3JlYXRpb25EYXRlIChEOjIwMTkwNDE4MTcwNTI2KzAzJzAwJykKL0NyZWF0 b3IgKFBERi1YQ2hhbmdlIE9mZmljZSBBZGRpbikKL0NyZWF0b3JUb29sIChQREYtWENoYW5nZS..."

• many pages instead of 2 which I expect

//Option 2

import org.apache.commons.codec.binary.Base64; 
import groovy.json.JsonSlurper
import com.itextpdf.text.*
import com.itextpdf.text.pdf.PdfWriter;

def content = messageExchange.response.responseContent
def cont = messageExchange.response.responseContent
def fileName = messageExchange.modelItem.testStep.testCase.getPropertyValue("DOC") + '_test.pdf'
Base64 coder = new Base64();
//assert null != response, "response is null"
def encodedString = cont.getBytes("UTF-8").encodeBase64().toString()
def decoded = encodedString.decodeBase64();
def res = new File( "F:\\Test\\Testing\\Files\\assertion\\$fileName")
res.write(content, "UTF-8")
//res.delete(); -> without this line 
res << encodedString
log.info res

I'm expecting document with correct pdf content. Result: From Option 2 - File is created with 2 blank pages

//Option 3

import org.apache.commons.codec.binary.Base64; 
import groovy.json.JsonSlurper
import com.itextpdf.text.*
import com.itextpdf.text.pdf.PdfWriter;

def fileName = messageExchange.modelItem.testStep.testCase.getPropertyValue("DOC_PID") + '_test.pdf'
def cont = messageExchange.response.responseContent
String content = cont
def encoded = content.getBytes("UTF-8").encodeBase64().toString()
byte[] decoded = encoded.decodeBase64()
def document = new Document()
PdfWriter.getInstance(document,new FileOutputStream(fileName));

I'm expecting document with correct pdf content. Result: From Option 3 - i'm reciving error window with message "name of file (access is denied)

Which option is the best ? and how to improve it ?

---

*Thanks for response, at first I need to admitt that i made mistake, and i took wrong type of response it was 'Raw', and i should use 'XML' which has correct response. Also I had limitation in 'Max size' property which affected response. Now i set correct size, and I changed content of response. Code looks like that:

import com.eviware.soapui.support.XmlHolder
def cont = new XmlHolder(messageExchange.responseContentAsXml)
content = cont["//*:data"]
def fileName = messageExchange.modelItem.testStep.testCase.getPropertyValue("DOC") + '_test.pdf'
new File( "F:\\Test\\Testing\\Files\\assertion\\$fileName").bytes = content.decodeBase64()

Assertion is passed but stil pdf file has blank pages. I'm sure that this is Base64 encoded document and I need to decode it.

Final solution which works for me is(but remeber to have response in JSON which is encode in Base64):

import org.apache.commons.codec.binary.Base64; 
import groovy.json.JsonSlurper
//grab the response
def content = messageExchange.response.responseContent
def jsonSlurper = new JsonSlurper().parseText(content)
assert !(jsonSlurper.isEmpty())
document_content = jsonSlurper.fileContent
def fileName = messageExchange.modelItem.testStep.testCase.getPropertyValue("DOC") + '_.pdf'
new File( ""F:\\Test\\Testing\\Files\\assertion\\$fileName"").bytes = document_content.decodeBase64()

log.info fileName

Answer 1

if response content contains base64 encoded pdf then following should work to write decoded pdf into a file:

def content = messageExchange.response.responseContent
new File( "F:\\Test\\Testing\\Files\\assertion\\$fileName").bytes = content.decodeBase64()

String in groovy has built-in method decodeBase64() that returns decoded content as bytes

Then you just need to write bytes into a file.