script.gs

let HOMEWORK_NOTE_ID = '' // hackmd note to write to
let HACKMD_API_KEY = '' // your hackmd api key
let GITHUB_PERSONAL_ACCESS_TOKEN = '' // currently not in use

let EMAIL = {
  'recipient': '',
  'subject': 'Linux 核心課程: 已收到第 4 次作業的提交',
  'body': '(本信件是自動產生，請不要回覆)\n請詳閱 https://hackmd.io/@sysprog/linux2024-lab0 的說明，確認 HackMD 筆記的存取權限及內容規範符合預期，若登記成功，應可在 https://hackmd.io/@sysprog/linux2024-homework4 見到你提交的 GitHub/HackMD 超連結。\n\n' 
}
let PUBLISHED_LINKS = []; // kind of ugly but it works

// Exexcute this once to subscribe onSubmit event
function setTrigger() {
  let currentForm = FormApp.getActiveForm();
  ScriptApp.newTrigger('onSubmit')
    .forForm(currentForm)
    .onFormSubmit()
    .create();
}

function onSubmit(e){
  let reponses =  e.response.getItemResponses();
  let username = reponses[2].getResponse();
  let note = reponses[3].getResponse();
  EMAIL.recipient = reponses[0].getResponse();
  let code = reponses[???].getResponse(); // Fill in corresponding index

  if(logError(checkMail(EMAIL.recipient, code)) && logError(checkUsername(username)) && logError(checkNotePermission(note))){
    // second one won't be check if failed on the first one
    let content_to_insert = `    * [開發紀錄](${PUBLISHED_LINKS[0]})`;
    logError(updateNote(HOMEWORK_NOTE_ID, username, content_to_insert)); // May fail
  }

  GmailApp.sendEmail(EMAIL.recipient, EMAIL.subject, EMAIL.body);
  console.log('Email sent!');
}

function checkMail(addr, code){
    // second argument is a RSA private key in pem format, which could be generated by $ openssl genrsa 
    let sig = Utilities.computeRsaSha256Signature(addr,
    "-----BEGIN PRIVATE KEY-----\nYOUR_KEY\n-----END PRIVATE KEY-----\n");
  
    if(code !== Utilities.base64Encode(sig))
      return 16;

    return 200;
}

function checkRepo(username, repo) {
  let pattern = new RegExp(`^(https:\/\/github.com\/${username})`);
  if(repo.match(pattern) === null){
    return 16;
  }
  else{
    return 200;
  }
}

// only work on my repo
function checkGHAction() {
  let GET_option = {
    'muteHttpExceptions': true,
    'headers': {
      'Authorization': `Bearer ${GITHUB_PERSONAL_ACCESS_TOKEN}`,
      'Accept': 'application/vnd.github+json',
      'X-GitHub-Api-Version': '2022-11-28'
    }
  }

  let response = UrlFetchApp.fetch(`https://api.github.com/repos/idoleat/lab0-c/actions/permissions`, GET_option);
  console.log(`GitHub Action enabled? ${JSON.parse(response).enabled}`); 
}

function checkRepo(username, repo) {
  let pattern = new RegExp(`^(https:\/\/github.com\/${username})`);
  if(repo.match(pattern) === null){
    return 16;
  }
  else{
    return 200;
  }
}

function checkNotePermission(url){
  console.log(`Check note: ${url}`);
  let response;

  let GET_options = {
    'method': 'get',
    'muteHttpExceptions': true,
    'headers': {
      'Authorization': `Bearer ${HACKMD_API_KEY}`
    }
  };

  response = UrlFetchApp.fetch(`${url}/edit`, {'muteHttpExceptions': true});
  if(response.getResponseCode() !== 200){
    return response.getResponseCode();
  }
  let noteID = response.getHeaders()['hackmd-note-id']; 
  console.log(`Note ID: ${noteID}`);

  response = UrlFetchApp.fetch(`https://api.hackmd.io/v1/notes/${noteID}`, GET_options); // May fail
  if(response.getResponseCode() !== 200){
    return response.getResponseCode();
  }
  let body = JSON.parse(response);
  if(body['readPermission'] !== 'guest'){ // should be reported at the first check though
    return 10;
  }
  if(body['writePermission'] !== 'signed_in' && body['writePermission'] !== 'guest'){
    return 11;
  }
  if(body['publishedAt'] === null){
    return 12;
  }
  PUBLISHED_LINKS.push(body['publishLink']);

  console.log('All check passed!'); // I don't know why this won't show
  return 200;
}

/// @noteID: String
function updateNote(noteID, username, linksStr){
  let response;
  let data = {
    'content': '',
    'readPermission': '',
    'writePermission': '',
    'permalink': ''
  }
  let GET_options = {
    'method': 'get',
    'muteHttpExceptions': true,
    'headers': {
      'Authorization': `Bearer ${HACKMD_API_KEY}`
    }
  };
  response = UrlFetchApp.fetch(`https://api.hackmd.io/v1/notes/${noteID}`, GET_options); // May fail
  if(response.getResponseCode() !== 200){
    return 13;
  }
  let body = JSON.parse(response);
  data.readPermission = body.readPermission;
  data.writePermission = body.writePermission;
  data.permalink = body.permalink;

  // Check if ID existed. Update or Add accordingly.
  let pattern = new RegExp(username);
  let result = body.content.match(pattern);
  if(result === null){
    // Add an entry to buttom
    data.content = body.content + `- [ ] ${username}\n${linksStr}\n`;
    console.log(`Note updated with new entry as: ${data.content}`);
  }
  else if(result.length === 1){
    let pattern = `- \\[ \\] ${username}\n.*\n`; // wildcard does not include \n
    let lines = linksStr.match(/\n/);
    if(lines !== null){
      for(let i=0; i<lines.length; i++){
        pattern += '.*\n';
      }
    }
    // Update the existed links
    const toReplace = new RegExp(pattern);
    data.content = body.content.replace(toReplace, `- [ ] ${username}\n${linksStr}\n`);
    console.log(`Note updated as: ${data.content}`);
  }
  else{
    console.log('WTF');
    // cases that other that 0 or 1 is unexpected and should be unreachable
    return 14;
  }
  
  let PATCH_options = {
    'method': 'patch',
    'muteHttpExceptions': true,
    'contentType': 'application/json',
    'payload' : JSON.stringify(data),
    'headers': {
      'Authorization': `Bearer ${HACKMD_API_KEY}`
    }
  };
  response = UrlFetchApp.fetch(`https://api.hackmd.io/v1/teams/sysprog/notes/${noteID}`, PATCH_options); // May fail
  if(response.getResponseCode() !== 202){
    return 15;
  }

  console.log('Updated successfully.');
  return 200;
}

function logError(result){
  switch(result){
    case 200:
      console.log('response 200. continue');
      return true;
    case 403:
      console.log('We do not have permisison to view the note.');
      EMAIL.body += '錯誤: 沒有權限瀏覽筆記，請檢查權限設定。';
      break;
    case 404:
      console.log('We can not find your note.');
      EMAIL.body += '錯誤: 無法找到此筆記，請檢查網址是否正確。';
      break;
    case 10:
      console.log('Read permission should be set to everyone.');
      EMAIL.body += '錯誤: 筆記應允許所有人瀏覽，請更新筆記權限。';
      break;
    case 11:
      console.log('Write permission should be set to signed-in user.');
      EMAIL.body += '錯誤: 筆記應設為允許所有登入者編輯，請更新編輯權限。';
      break;
    case 12:
      console.log('Note should be published.');
      EMAIL.body += '錯誤: 筆記應公開發布於網際網路，請參閱 HackMD 文件。';
      break;
    case 13:
      console.log('Not responded with 200 while getting the note for listing homeworks.');
      EMAIL.body += '* Not responded with 200 while getting the note for listing homeworks ，請回報此狀況。';
      break;
    case 14:
      console.log('More than one entry in the note with same username');
      EMAIL.body += '* More than one entry in the note with same username ，請回報此狀況。';
      break;
    case 15:
      console.log('Not responded with 202 while updating the note.');
      EMAIL.body += '* Not responded with 202 while updating the note ，請回報此狀況。';
      break;
    case 16:
    console.log('錯誤: GitHub 帳號或 fork 後的網址不符合預期');
      EMAIL.body += '錯誤: GitHub 帳號或 fork 後的網址不符合預期';
      break;
    case 17:
    console.log('錯誤: 電子郵件地址無法收信');
      EMAIL.body += '錯誤: 電子郵件地址無法收信';
      break;
    default:
      console.log(`Unexpected error code ${result}. Please report this problem.`);
      EMAIL.body += `* Unexpected error code ${result} ，請回報此狀況。`;
      break;
  }
  EMAIL.body += '\n錯誤改正後，請用指定的 Google 表單提交。'

  return false;
}



function test(){
  let currentForm = FormApp.getActiveForm();
  const formResponse = currentForm.createResponse();
  const items = currentForm.getItems();
  formResponse.withItemResponse(items[0].asTextItem().createResponse('idoleat@ccns.ncku.edu.tw'));
  formResponse.withItemResponse(items[1].asTextItem().createResponse('簡志瑋'));
  formResponse.withItemResponse(items[2].asTextItem().createResponse('idoleat'));
  formResponse.withItemResponse(items[4].asTextItem().createResponse('https://github.com/idoleat/Christmas-card'));
  formResponse.withItemResponse(items[5].asTextItem().createResponse('https://hackmd.io/@idoleat/damp-air'));
  formResponse.submit();
}