google_apps_script_choices.js

function onOpen(e) {
  FormApp.getUi()
    .createAddonMenu()
    .addItem("Add Questions to Blank Quiz", "processUpload")
    .addToUi();
}

function onInstall(e){
  onOpen(e);
};

function processUpload() {
  var form = FormApp.getActiveForm();
  var ui = FormApp.getUi();

  // Delete all items in the form
  var items = form.getItems();

  while(items.length > 0){
    form.deleteItem(items.pop());
  }

  createTest("ignored", true);
}

function questionUrl(url) {
  if (url.lastIndexOf("https:", 0) !== 0) {
    return "https:" + url;
  } else {
    return url;
  }
}

function fetchImages(questions) {
  let urls = questions
              .map(q => questionUrl(q.url))

  let imageResponses = UrlFetchApp.fetchAll(urls);

  return imageResponses.map(e => e.getBlob());
}

function createTest (url, required) {
  var data = sampleData();

  var form = FormApp.getActiveForm();

  form.setIsQuiz(true);

  form.setTitle(data.title)

  // don't want shuffling since image items are separate from answers
  form.setShuffleQuestions(false);

  let questionImages = fetchImages(data.quiz.questions);

  data.quiz.questions.forEach(function(question, index) {
    var position = question.position || index + 1;
    var points = question.points || 1;
    var title = "Question " + position;

    if (!data.answer_sheet) {

      form.addImageItem()
        .setImage(questionImages[index])
        .setTitle("Question " + position)
    }

    if (question.type === "mc") {
      var item = form.addMultipleChoiceItem();
      item.setPoints(points);

      if (data.answer_sheet) { item.setTitle("Question " + position) }

      var choices = [];

      for (var i=0; i < question.count; i++) {
        choices.push(item.createChoice(String.fromCharCode(65 + i), i+1 == question.correct));
      }

      item.setRequired(required);
      item.setChoices(choices);
    } else {
      var item = form.addTextItem();
      if (data.answer_sheet) { item.setTitle("Question " + position) }
      item.setPoints(points);
      item.setRequired(required);
    }
  });
}

function sampleData() {
  return {
    "answer_sheet": false,
    "quiz": {
      "questions": [
        {
          "correct": 4,
          "count": 4,
          "points": 1,
          "position": 1,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 4,
          "count": 4,
          "points": 1,
          "position": 2,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 4,
          "count": 4,
          "points": 1,
          "position": 3,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 3,
          "count": 4,
          "points": 1,
          "position": 4,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 2,
          "count": 4,
          "points": 1,
          "position": 5,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 4,
          "count": 4,
          "points": 1,
          "position": 6,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 1,
          "count": 4,
          "points": 1,
          "position": 7,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 4,
          "count": 4,
          "points": 1,
          "position": 8,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 3,
          "count": 4,
          "points": 1,
          "position": 9,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 4,
          "count": 4,
          "points": 1,
          "position": 10,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 3,
          "count": 4,
          "points": 1,
          "position": 11,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 1,
          "count": 4,
          "points": 1,
          "position": 12,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 2,
          "count": 4,
          "points": 1,
          "position": 13,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 2,
          "count": 4,
          "points": 1,
          "position": 14,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 4,
          "count": 4,
          "points": 1,
          "position": 15,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 1,
          "count": 4,
          "points": 1,
          "position": 16,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 4,
          "count": 4,
          "points": 1,
          "position": 17,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 4,
          "count": 4,
          "points": 1,
          "position": 18,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 4,
          "count": 4,
          "points": 1,
          "position": 19,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 3,
          "count": 4,
          "points": 1,
          "position": 20,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 3,
          "count": 4,
          "points": 1,
          "position": 21,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 4,
          "count": 4,
          "points": 1,
          "position": 22,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 2,
          "count": 4,
          "points": 1,
          "position": 23,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 3,
          "count": 4,
          "points": 1,
          "position": 24,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 4,
          "count": 4,
          "points": 1,
          "position": 25,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 2,
          "count": 4,
          "points": 1,
          "position": 26,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 2,
          "count": 4,
          "points": 1,
          "position": 27,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 3,
          "count": 4,
          "points": 1,
          "position": 28,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 4,
          "count": 4,
          "points": 1,
          "position": 29,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        },
        {
          "correct": 2,
          "count": 4,
          "points": 1,
          "position": 30,
          "type": "mc",
          "url": "//via.placeholder.com/468x100"
        }
      ]
    },
    "title": "30 problem doc"
  }
}