أداة التحقّق من الروابط - الحساب الإداري

يعمل نص "أداة التحقّق من الروابط" للحسابات الإدارية على "إعلانات Google" على توسيع النص البرمجي لأداة التحقّق من ربط الحساب الواحد ليتم تشغيله لحسابات متعددة ضمن حساب إداري.

فمع تطور الموقع الإلكتروني، تتم إضافة صفحات جديدة وتتم إزالة الصفحات القديمة وتعطّل الروابط وإصلاحها. إنّ الحفاظ على تزامن حملة "إعلانات Google" مع الموقع الإلكتروني هو معركة مستمرة للعديد من المعلِنين. قد تشير الإعلانات المباشرة إلى صفحات غير متوفّرة، وينتهي الأمر بالمعلِن للدفع مقابل نقرات تؤدي إلى ظهور أخطاء 404.

تعالج أداة التحقق من الروابط هذه المشكلة من خلال مراجعة جميع الإعلانات والكلمات الرئيسية وروابط أقسام الموقع، والتحقق من أن عناوين URL التابعة لها لا تؤدي إلى ظهور الرسالة "لم يتم العثور على الصفحة" أو أي أنواع أخرى من استجابات الخطأ، وإرسال رسالة إلكترونية إليك عند العثور على ردود خطأ، وحفظ نتائج تحليلها في جدول بيانات.

قد تحتوي بعض الحسابات على عدد كبير من عناوين URL التي لا يمكن التحقّق منها كلها في عملية تشغيل واحدة بسبب الحدود القصوى لوقت التنفيذ أو quotas. وقد تم تصميم النص البرمجي للتعامل مع هذه الحالة من خلال تتبُّع تقدمه على عدة عمليات تشغيل والتحقق فقط من عناوين URL التي لم يفحصها سابقًا. يستخدم النص البرمجي مصطلح "تحليل" للإشارة إلى تمرير واحد كامل من خلال جميع عناوين URL، حتى إذا استغرق إكماله عدة عمليات تشغيل.

الإعداد

يمكن تحديد الخيارات الرئيسية للنص البرمجي في جدول البيانات.

النطاق

يحدد ما إذا كان النص البرمجي يتحقّق من الإعلانات والكلمات الرئيسية وروابط أقسام الموقع، وما إذا كان النص البرمجي يتحقّق منها حتى إذا كانت متوقفة مؤقتًا. وعلى معظم المستخدمين تضمين العناصر الثلاثة جميعها لضمان التحقّق من جميع عناوين URL، ولكن ليس من الضروري عادةً التحقّق من الكيانات المتوقفة مؤقتًا.

رموز الاستجابة الصالحة

قائمة رموز استجابة HTTP التي تُعتبر صالحة. على معظم المستخدمين اعتبار 200 رمز استجابة صالحًا فقط.

إرسال رسالة إلكترونية بعد كل عملية تنفيذ للنص البرمجي

في حال تفعيل هذا الخيار، يرسل إليك النص البرمجي ملخصًا بعناوين URL التي تم التحقّق منها بعد كل عملية تشغيل. ويمكن أن يزودك هذا بتنبيه مبكر حول أخطاء عناوين URL بدلاً من الاضطرار إلى انتظار التحقق من جميع عناوين URL (الأمر الذي قد يستغرق عدة عمليات تشغيل).

إرسال رسالة إلكترونية بعد الانتهاء من التحليل بالكامل

في حال تفعيل هذا الخيار، سيُرسل إليك النص البرمجي ملخّصًا مدمجًا بعد انتهاء عملية التحقّق من جميع عناوين URL.

إرسال رسالة إلكترونية حتى في حال عدم العثور على أي أخطاء

في حال تفعيل هذا الخيار، سيُرسل إليك النص البرمجي رسالة إلكترونية (بناءً على الخيارَين السابقَين) حتى إذا لم يعثر على أي أخطاء. يفضّل معظم المستخدمين تلقّي الرسائل الإلكترونية فقط في حال حدوث أخطاء، ولكنّ تلقّي رسالة إلكترونية حتى في حال عدم وجود أي أخطاء يمكن أن يكون طريقة مفيدة لضمان تشغيل النص البرمجي في الموعد المحدَّد.

حفظ عناوين URL الصالحة في جدول بيانات

في حال تفعيل هذا الخيار، يحفظ النص البرمجي كل عنوان URL يتحقّق منه في جدول البيانات، وليس فقط العناوين التي تحتوي على أخطاء. يفضّل معظم المستخدمين حفظ عناوين URL المعطلة فقط، بينما قد يرغب البعض في رؤية إجمالي عدد عناوين URL التي تحقّق منها النص البرمجي.

عدد الأيام التي تفصل بين التحليلات

يمكنك استخدام هذا الخيار للتحكّم في عدد المرات التي يبدأ فيها النص البرمجي تحليلاً جديدًا لقائمة عناوين URL بالكامل. تجدر الإشارة إلى أن هذا الخيار يتحكّم في الحد الأدنى لعدد الأيام التي تفصل بين التحليلات. يمكن أن يكون العدد الفعلي أعلى إذا استغرق التحليل وقتًا أطول (على سبيل المثال، إذا كان لديك عدد كبير من عناوين URL). راجِع الجدولة للحصول على مزيد من التفاصيل.

الطريقة المتقدّمة للتحقق من صحة الرابط

وفي بعض حالات الاستخدام، قد لا يكفي مجرد معرفة أنّ عنوان URL يعرض صفحة صالحة. على سبيل المثال، ضع في اعتبارك الحالة التي تحتوي فيها صفحة المنتج على النص "تم إيقاف المنتج". في هذه الحالة، يمكنك الإبلاغ عن الصفحة باعتبارها رابطًا معطّلاً.

يقدم النص البرمجي خيارين للتحقق من الصحة:

سلاسل الإخفاق

اضبط استخدام مطابقة بسيطة لسلسلة إخفاق على Yes للبحث عن تكرارات قائمة السلاسل المحددة في سلاسل الإخفاق. يؤدي أي موضع ورود في صفحة الويب إلى وضع علامة على الصفحة على أنها معطلة.

تحذير: قد يؤدي استخدام سلاسل الأخطاء إلى انخفاض طفيف في الأداء بسبب الاضطرار إلى إجراء عمليات بحث نصية في كل صفحة.

التحقّق المخصّص

لمزيد من المرونة، يمكن استخدام دالة مخصّصة للتحقّق من صحة JavaScript على كل عنوان URL واستجابة. على سبيل المثال، يمكنك التأكد من أن عنوان صفحة الويب يحتوي على اسم علامتك التجارية على النحو التالي:

1. اضبط استخدام دالة مخصّصة للتحقّق من الصحة على Yes.

2. أدخِل منطق التحقق المخصص في دالة بالقرب من أعلى النص البرمجي:

   function isValidResponse(url, response, options, entityDetails) {
     // Your custom logic here, returning true for valid links, false otherwise.
     // ...
   }
   

تم بالفعل تنفيذ عملية تنفيذ أساسية، مع أمثلة على كيفية الوصول إلى نص الرد.

الجدولة

وفي كلّ مرّة يتم فيها تشغيل النص البرمجي، يرصد تلقائيًا ما إذا كان يجب استئناف التحليل قيد التنفيذ أو ما إذا كان قد انتهى التحليل الأخير وحان الوقت لبدء تحليل جديد (استنادًا إلى خيار الأيام التي تفصل بين التحليلات). ونتيجةً لذلك، بغض النظر عن عدد المرات التي تريد فيها بدء تحليل جديد، عليك جدولة النص البرمجي لتشغيله كل ساعة بحيث يتكرر كل تحليل من خلال عناوين URL في أسرع وقت ممكن.

على سبيل المثال، اضبط الأيام التي تفصل بين التحليلات على 1 للتسبب في تشغيل النص البرمجي لتحليل جديد أكثر من مرة واحدة في اليوم. إذا تمت جدولة تشغيل النص البرمجي كل ساعة وانتهى من فحص جميع عناوين URL في أقل من يوم، ستنتهي عمليات التنفيذ اللاحقة على الفور حتى اليوم التالي الذي يحين فيه بدء تحليل جديد.

آلية العمل

لتتبُّع مستوى تقدُّمه، ينشئ النص البرمجي تصنيفًا ويطبّقه على إعلاناتك وكلماتك الرئيسية وروابط أقسام الموقع بعد التحقّق منها. يستطيع النص البرمجي بعد ذلك تحديد عناوين URL التي تم التحقّق منها عند تشغيله في المرة التالية. بمجرد اكتمال التحليل (ويتم التحقق من جميع عناوين URL)، يقوم النص البرمجي بمسح التسمية لتحليل جديد.

يستخدم النص البرمجي UrlFetchApp للتحقق من روابط عناوين URL النهائية وروابط عناوين URL النهائية للأجهزة الجوّالة.

تحذير: تتحقّق أداة التحقّق من الروابط تمامًا من عناوين URL النهائية وروابط عناوين URL النهائية للأجهزة الجوّالة، وتتجاهل أي نماذج تتبُّع أو معلَمات ValueTrack (باستثناء ifmobile وifnotmobile) أو معلَمات مخصّصة. يمكنك استخدام حلّ بديل إذا كانت صفحاتك تستخدم أيًا من هذه العناصر.

ضبط إعدادات الجهاز

• انقر على الزر أدناه لإنشاء نص برمجي مستند إلى جدول البيانات في حسابك على "إعلانات Google".

  تثبيت نموذج النص البرمجي

• انقر فوق الزر أدناه لإنشاء نسخة من جدول بيانات النموذج.

  نسخ جدول بيانات النموذج

• تحديث spreadsheet_url في النص البرمجي.

• حدِّد موعدًا لتنفيذ النص البرمجي كل ساعة.

رمز مصدر

// Copyright 2015, Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @name Link Checker - Manager Accounts
 *
 * @overview The Link Checker script iterates through the ads, keywords, and
 *     sitelinks in your manager account hierarchy and makes sure their URLs
 *     do not produce "Page not found" or other types of error responses. See
 *     https://developers.google.com/google-ads/scripts/docs/solutions/manager-link-checker
 *     for more details.
 *
 * @author Google Ads Scripts Team [[e-mail]]
 *
 * @version 3.1
 *
 * @changelog
 * - version 3.1
 *   - Split into info, config, and code.
 * - version 3.0
 *   - Updated to use new Google Ads scripts features.
 * - version 2.2
 *   - Added support for failure strings and custom validation functions.
 * - version 2.1
 *   - Added expansion of conditional ValueTrack parameters (e.g. ifmobile).
 *   - Added expanded text ad and other ad format support.
 * - version 2.0.3
 *   - Added validation for external spreadsheet setup.
 * - version 2.0.2
 *   - Allow the custom tracking label to include spaces.
 * - version 2.0.1
 *   - Catch and output all UrlFetchApp exceptions.
 *   - Completely revised the script to work on larger accounts and hierarchies.
 * - version 1.3
 *   - Enhanced to include ad group sitelinks.
 *   - Updated to track completion across runs and send at most one email
 *     per day.
 * - version 1.2
 *   - Remove label flushing code from the script.
 * - version 1.1
 *   - Remove some debug code.
 * - version 1.0
 *   - Released initial version.
 */
/**
 * Configuration to be used for the Link Checker.
 */

CONFIG = {
  // URL of the spreadsheet template.
  // This should be a copy of
  // https://docs.google.com/spreadsheets/d/1iO1iEGwlbe510qo3Li-j4KgyCeVSmodxU6J7M756ppk/copy.
  // Make sure the sheet is owned by or shared with same Google user executing the script
  'spreadsheet_url': 'YOUR_SPREADSHEET_URL',

  // Array of addresses to be alerted via email if issues are found.
  'recipient_emails': ['YOUR_EMAIL_HERE'],

  // Label to use when a link has been checked.
  'label': 'LinkChecker_Done',

  // A list of ManagedAccountSelector conditions to restrict the population
  // of child accounts that will be processed. Leave blank or comment out
  // to include all child accounts.
  'account_conditions': [],

  // Number of seconds to sleep after each URL request. Use this throttle
  // to reduce the load that the script imposes on your web server(s).
  'throttle_seconds': 0,

  // Number of seconds before timeout that the script should stop checking URLs
  // to make sure it has time to output its findings.
  'timeout_buffer_seconds': 120,

  'advanced_options': {
    /**
     * Parameters controlling the script's behavior after hitting a UrlFetchApp
     * QPS quota limit.
     */
    'quota_config': {
      // Initial number of milliseconds to sleep.
      'INIT_SLEEP_TIME_MILLIS': 250,
      // Multiplicative factor to increase sleep time by on each retry.
      'BACKOFF_FACTOR': 2,
      // Maximum number of tries for a single URL.
      'MAX_TRIES': 5
    }
  }
};
/**
 * Performs custom validation on a URL, with access to details such as the URL,
 * the response from the server, configuration options and entity Details.
 *
 * To use, the "Use Custom Validation" option in the configuration spreadsheet
 * must be set to "Yes", and your custom validation code implemented within the
 * below function.
 *
 * See the documentation for this solution for further details.
 *
 * @param {string} url The URL being checked.
 * @param {!HTTPResponse} response The response object for the request.
 * @param {!Object} options Configuration options.
 * @param {!Object} entityDetails Details of the associated Ad / Keywords etc.
 * @return {boolean} Return true if the URL and response are deemed valid.
 */
function isValidResponse(url, response, options, entityDetails) {
  /*
     Some examples of data that can be used in determining the validity of this
     URL. This is not exhaustive and there are further properties available.
  */

  // The HTTP status code, e.g. 200, 404
  // const responseCode = response.getResponseCode();

  // The HTTP response body, e.g. HTML for web pages:
  // const responseText = response.getContentText();

  // The failure strings from the configuration spreadsheet, as an array:
  // const failureStrings = options.failureStrings;

  // The type of the entity associated with the URL, e.g. Ad, Keyword, Sitelink.
  // const entityType = entityDetails.entityType;

  // The campaign name
  // const campaignName = entityDetails.campaign;

  // The ad group name, if applicable
  // const adGroupName = entityDetails.adGroup;

  // The ad text, if applicable
  // const adText = entityDetails.ad;

  // The keyword text, if applicable
  // const keywordText = entityDetails.keyword;

  // The sitelink link text, if applicable
  // const sitelinkText = entityDetails.sitelink;

  /*
   Remove comments and insert custom logic to determine whether this URL and
   response are valid, using the data obtained above.

   If valid, return true. If invalid, return false.
  */

  // Placeholder implementation treats all URLs as valid
  return true;
}

const MILLISECONDS_PER_SECOND = 1000;
const QUOTA_CONFIG = CONFIG.advanced_options.quota_config;

const SPREADSHEET_URL = CONFIG.spreadsheet_url;
const RECIPIENT_EMAILS = CONFIG.recipient_emails;
const LABEL = CONFIG.label;
const THROTTLE_SECONDS = CONFIG.throttle_seconds;
const TIMEOUT_BUFFER_SECONDS = CONFIG.timeout_buffer_seconds;
const ACCOUNT_CONDITIONS = CONFIG.account_conditions;

/**
 * Exceptions that prevent the script from finishing checking all URLs in an
 * account but allow it to resume next time.
 */
const EXCEPTIONS = {
  QPS: 'Reached UrlFetchApp QPS limit',
  LIMIT: 'Reached UrlFetchApp daily quota',
  TIMEOUT: 'Approached script execution time limit'
};

/**
 * Named ranges in the spreadsheet.
 */
const NAMES = {
  CHECK_AD_URLS: 'checkAdUrls',
  CHECK_KEYWORD_URLS: 'checkKeywordUrls',
  CHECK_SITELINK_URLS: 'checkSitelinkUrls',
  CHECK_PAUSED_ADS: 'checkPausedAds',
  CHECK_PAUSED_KEYWORDS: 'checkPausedKeywords',
  CHECK_PAUSED_SITELINKS: 'checkPausedSitelinks',
  VALID_CODES: 'validCodes',
  EMAIL_EACH_RUN: 'emailEachRun',
  EMAIL_NON_ERRORS: 'emailNonErrors',
  EMAIL_ON_COMPLETION: 'emailOnCompletion',
  SAVE_ALL_URLS: 'saveAllUrls',
  FAILURE_STRINGS: 'failureStrings',
  FREQUENCY: 'frequency',
  DATE_STARTED: 'dateStarted',
  DATE_COMPLETED: 'dateCompleted',
  DATE_EMAILED: 'dateEmailed',
  NUM_ERRORS: 'numErrors',
  RESULT_HEADERS: 'resultHeaders',
  ARCHIVE_HEADERS: 'archiveHeaders',
  USE_SIMPLE_FAILURE_STRINGS: 'useSimpleFailureStrings',
  USE_CUSTOM_VALIDATION: 'useCustomValidation'
};

function main() {
  const spreadsheet = validateAndGetSpreadsheet(SPREADSHEET_URL);
  validateEmailAddresses();
  spreadsheet.setSpreadsheetTimeZone(AdsApp.currentAccount().getTimeZone());

  const options = loadOptions(spreadsheet);
  const status = loadStatus(spreadsheet);

  if (!status.dateStarted) {
    // This is the very first execution of the script.
    startNewAnalysis(spreadsheet);
  } else if (status.dateStarted > status.dateCompleted) {
    console.log(`Resuming work from a previous execution.`);
  } else if (dayDifference(status.dateStarted, new Date()) <
             options.frequency) {
    console.log(`Waiting until ${options.frequency} days have elapsed since ` +
                `the start of the last analysis.`);
    return;
  } else {
    // Enough time has passed since the last analysis to start a new one.
    removeLabelsInAccounts();
    removeAccountLabels([LABEL]);
    startNewAnalysis(spreadsheet);
  }

  ensureAccountLabels([LABEL]);

  // Get up to 50 accounts that have not yet had all of their URLs checked.
  const accountSelector = getAccounts(false).withLimit(50);
  if (accountSelector.get().hasNext()) {
    accountSelector
        .executeInParallel('processAccount', 'processResults', JSON.stringify(options));
  } else {
    processResults([]);
  }
}

/**
 * Retrieves all accounts that either have had their URLs checked or need to
 * have their URLs checked.
 *
 * @param {boolean} isChecked True to get accounts that have been checked
 *     already, false to get accounts that have not have been checked already.
 *     Ignored if the label does not exist.
 * @return {Object} An account selector.
 */
function getAccounts(isChecked) {
  let accountSelector = AdsManagerApp.accounts();
  
  const accountLabel = getAccountLabel(LABEL);

  if (accountLabel) {
    accountSelector = accountSelector
      .withCondition(`customer_client.applied_labels ${(isChecked ? `CONTAINS ANY` : `CONTAINS NONE`)}` +
          ` ("${accountLabel.getResourceName()}")`);
  }

  if (ACCOUNT_CONDITIONS) {
    for (const condition of ACCOUNT_CONDITIONS) {
      accountSelector =
          accountSelector.withCondition(condition);
    }
  }

  return accountSelector;
}

/**
 * Removes the tracking in each account that was previously analyzed, thereby
 * clearing that account for a new analysis.
 */
function removeLabelsInAccounts() {
  const managerAccount = AdsApp.currentAccount();
  const accounts = getAccounts(true).get();

  for (const account of accounts) {
    AdsManagerApp.select(account);
    removeLabels([LABEL]);
  }

  AdsManagerApp.select(managerAccount);
}

/**
 * Performs the link checking analysis on the current account.
 *
 * @param {string} options Options from the spreadsheet as JSON.
 * @return {string} JSON stringified results of the analysis.
 */
function processAccount(options) {
  return JSON.stringify(analyzeAccount(JSON.parse(options)));
}

/**
 * Consolidates results from each account and outputs them.
 *
 * @param {Array.<Object>} executionResults A list of ExecutionResult objects.
 */
function processResults(executionResults) {
  const spreadsheet = SpreadsheetApp.openByUrl(SPREADSHEET_URL);
  const options = loadOptions(spreadsheet);
  const results = {
    urlChecks: [],
    didComplete: true
  };

  for (const result of executionResults) {
    if (!result.getError()) {
      const accountResult = JSON.parse(result.getReturnValue());
      results.urlChecks = results.urlChecks.concat(accountResult.urlChecks);
      results.didComplete = results.didComplete && accountResult.didComplete;

      if (accountResult.didComplete) {
        AdsManagerApp.accounts()
            .withIds([result.getCustomerId()])
            .get()
            .next()
            .applyLabel(LABEL);
      }
    } else {
      console.log(`Processing for ${result.getCustomerId()} failed.`);
    }
  }

  // The entire analysis is not complete if there are any accounts that have
  // not been labeled (i.e., the account was not started, or not all URLs in
  // the account have been checked).
  results.didComplete = results.didComplete &&
      !getAccounts(false).get().hasNext();

  outputResults(results, options);
}

/**
 * Checks as many new URLs as possible that have not previously been checked,
 * subject to quota and time limits.
 *
 * @param {Object} options Dictionary of options.
 * @return {Object} An object with fields for the URLs checked and an indication
 *     if the analysis was completed (no remaining URLs to check).
 */
function analyzeAccount(options) {
  // Ensure the label exists before attempting to retrieve already checked URLs.
  ensureLabels([LABEL]);

  const checkedUrls = getAlreadyCheckedUrls(options);
  const urlChecks = [];
  let didComplete = false;

  try {
    // If the script throws an exception, didComplete will remain false.
    didComplete = checkUrls(checkedUrls, urlChecks, options);
  } catch(e) {
    if (e == EXCEPTIONS.QPS ||
        e == EXCEPTIONS.LIMIT ||
        e == EXCEPTIONS.TIMEOUT) {
      console.log(`Stopped checking URLs early because: ${e}`);
      console.log(`Checked URLs will still be output.`);
    } else {
      throw e;
    }
  }

  return {
    urlChecks: urlChecks,
    didComplete: didComplete
  };
}

/**
 * Outputs the results to a spreadsheet and sends emails if appropriate.
 *
 * @param {Object} results An object with fields for the URLs checked and an
 *     indication if the analysis was completed (no remaining URLs to check).
 * @param {Object} options Dictionary of options.
 */
function outputResults(results, options) {
  const spreadsheet = SpreadsheetApp.openByUrl(SPREADSHEET_URL);

  const numErrors = countErrors(results.urlChecks, options);
  console.log(`Found ${numErrors} errors this execution.`);

  saveUrlsToSpreadsheet(spreadsheet, results.urlChecks, options);

  // Reload the status to get the total number of errors for the entire
  // analysis, which is calculated by the spreadsheet.
  status = loadStatus(spreadsheet);

  if (results.didComplete) {
    spreadsheet.getRangeByName(NAMES.DATE_COMPLETED).setValue(new Date());
    console.log(`Found ${status.numErrors} errors across the entire analysis.`);
  }

  if (RECIPIENT_EMAILS) {
    if (!results.didComplete && options.emailEachRun &&
        (options.emailNonErrors || numErrors > 0)) {
      sendIntermediateEmail(spreadsheet, numErrors);
    }

    if (results.didComplete &&
        (options.emailEachRun || options.emailOnCompletion) &&
        (options.emailNonErrors || status.numErrors > 0)) {
      sendFinalEmail(spreadsheet, status.numErrors);
    }
  }
}

/**
 * Loads data from a spreadsheet based on named ranges. Strings 'Yes' and 'No'
 * are converted to booleans. One-dimensional ranges are converted to arrays
 * with blank cells omitted. Assumes each named range exists.
 *
 * @param {Object} spreadsheet The spreadsheet object.
 * @param {Array.<string>} names A list of named ranges that should be loaded.
 * @return {Object} A dictionary with the names as keys and the values
 *     as the cell values from the spreadsheet.
 */
function loadDatabyName(spreadsheet, names) {
  const data = {};

  for (const name of names) {
    const range = spreadsheet.getRangeByName(name);

    if (range.getNumRows() > 1 && range.getNumColumns() > 1) {
      // Name refers to a 2d range, so load it as a 2d array.
      data[name] = range.getValues();
    } else if (range.getNumRows() == 1 && range.getNumColumns() == 1) {
      // Name refers to a single cell, so load it as a value and replace
      // Yes/No with boolean true/false.
      data[name] = range.getValue();
      data[name] = data[name] === 'Yes' ? true : data[name];
      data[name] = data[name] === 'No' ? false : data[name];
    } else {
      // Name refers to a 1d range, so load it as an array (regardless of
      // whether the 1d range is oriented horizontally or vertically).
      const isByRow = range.getNumRows() > 1;
      const limit = isByRow ? range.getNumRows() : range.getNumColumns();
      const cellValues = range.getValues();

      data[name] = [];
      for (let j = 0; j < limit; j++) {
        const cellValue = isByRow ? cellValues[j][0] : cellValues[0][j];
        if (cellValue) {
          data[name].push(cellValue);
        }
      }
    }
  }

  return data;
}

/**
 * Loads options from the spreadsheet.
 *
 * @param {Object} spreadsheet The spreadsheet object.
 * @return {Object} A dictionary of options.
 */
function loadOptions(spreadsheet) {
  return loadDatabyName(spreadsheet,
      [NAMES.CHECK_AD_URLS, NAMES.CHECK_KEYWORD_URLS,
       NAMES.CHECK_SITELINK_URLS, NAMES.CHECK_PAUSED_ADS,
       NAMES.CHECK_PAUSED_KEYWORDS, NAMES.CHECK_PAUSED_SITELINKS,
       NAMES.VALID_CODES, NAMES.EMAIL_EACH_RUN,
       NAMES.EMAIL_NON_ERRORS, NAMES.EMAIL_ON_COMPLETION,
       NAMES.SAVE_ALL_URLS, NAMES.FREQUENCY,
       NAMES.FAILURE_STRINGS, NAMES.USE_SIMPLE_FAILURE_STRINGS,
       NAMES.USE_CUSTOM_VALIDATION]);
}

/**
 * Loads state information from the spreadsheet.
 *
 * @param {Object} spreadsheet The spreadsheet object.
 * @return {Object} A dictionary of status information.
 */
function loadStatus(spreadsheet) {
  return loadDatabyName(spreadsheet,
      [NAMES.DATE_STARTED, NAMES.DATE_COMPLETED,
       NAMES.DATE_EMAILED, NAMES.NUM_ERRORS]);
}

/**
 * Saves the start date to the spreadsheet and archives results of the last
 * analysis to a separate sheet.
 *
 * @param {Object} spreadsheet The spreadsheet object.
 */
function startNewAnalysis(spreadsheet) {
  console.log(`Starting a new analysis.`);

  spreadsheet.getRangeByName(NAMES.DATE_STARTED).setValue(new Date());

  // Helper method to get the output area on the results or archive sheets.
  function getOutputRange(rangeName) {
    const headers = spreadsheet.getRangeByName(rangeName);
    return headers.offset(1, 0, headers.getSheet().getDataRange().getLastRow());
  }

  getOutputRange(NAMES.ARCHIVE_HEADERS).clearContent();

  const results = getOutputRange(NAMES.RESULT_HEADERS);
  results.copyTo(getOutputRange(NAMES.ARCHIVE_HEADERS));

  getOutputRange(NAMES.RESULT_HEADERS).clearContent();
}

/**
 * Counts the number of errors in the results.
 *
 * @param {Array.<Object>} urlChecks A list of URL check results.
 * @param {Object} options Dictionary of options.
 * @return {number} The number of errors in the results.
 */
function countErrors(urlChecks, options) {
  let numErrors = 0;

  for (const urlCheck of urlChecks) {
    if (options.validCodes.indexOf(urlCheck.responseCode) == -1) {
      numErrors++;
    }
  }

  return numErrors;
}

/**
 * Saves URLs for a particular account to the spreadsheet starting at the first
 * unused row.
 *
 * @param {Object} spreadsheet The spreadsheet object.
 * @param {Array.<Object>} urlChecks A list of URL check results.
 * @param {Object} options Dictionary of options.
 */
function saveUrlsToSpreadsheet(spreadsheet, urlChecks, options) {
  // Build each row of output values in the order of the columns.
  const outputValues = [];
  for (const urlCheck of urlChecks) {

    if (options.saveAllUrls ||
        options.validCodes.indexOf(urlCheck.responseCode) == -1) {
      outputValues.push([
        urlCheck.customerId,
        new Date(urlCheck.timestamp),
        urlCheck.url,
        urlCheck.responseCode,
        urlCheck.entityType,
        urlCheck.campaign,
        urlCheck.adGroup,
        urlCheck.ad,
        urlCheck.keyword,
        urlCheck.sitelink
      ]);
    }
  }

  if (outputValues.length > 0) {
    // Find the first open row on the Results tab below the headers and create a
    // range large enough to hold all of the output, one per row.
    const headers = spreadsheet.getRangeByName(NAMES.RESULT_HEADERS);
    const lastRow = headers.getSheet().getDataRange().getLastRow();
    const outputRange = headers.offset(lastRow - headers.getRow() + 1,
                                     0, outputValues.length);
    outputRange.setValues(outputValues);
  }

  for (const email of RECIPIENT_EMAILS) {
    spreadsheet.addEditor(email);
  }
}

/**
 * Sends an email to a list of email addresses with a link to the spreadsheet
 * and the results of this execution of the script.
 *
 * @param {Object} spreadsheet The spreadsheet object.
 * @param {boolean} numErrors The number of errors found in this execution.
 */
function sendIntermediateEmail(spreadsheet, numErrors) {
  spreadsheet.getRangeByName(NAMES.DATE_EMAILED).setValue(new Date());

  MailApp.sendEmail(
      RECIPIENT_EMAILS.join(','), `Link Checker Results`,
      `The Link Checker script found ${numErrors} URLs with errors in ` +
          `an execution that just finished. See ${
              spreadsheet.getUrl()} for details.`);
}

/**
 * Sends an email to a list of email addresses with a link to the spreadsheet
 * and the results across the entire account.
 *
 * @param {Object} spreadsheet The spreadsheet object.
 * @param {boolean} numErrors The number of errors found in the entire account.
 */
function sendFinalEmail(spreadsheet, numErrors) {
  spreadsheet.getRangeByName(NAMES.DATE_EMAILED).setValue(new Date());

  MailApp.sendEmail(
      RECIPIENT_EMAILS.join(','), `Link Checker Results`,
      `The Link Checker script found ${numErrors} URLs with errors ` +
          `across its entire analysis. See ${
              spreadsheet.getUrl()} for details.`);
}

/**
 * Retrieves all final URLs and mobile final URLs in the account across ads,
 * keywords, and sitelinks that were checked in a previous run, as indicated by
 * them having been labeled.
 *
 * @param {Object} options Dictionary of options.
 * @return {Object} A map of previously checked URLs with the URL as the key.
 */
function getAlreadyCheckedUrls(options) {
  const urlMap = {};

  function addToMap(items) {
    for (const item of items) {
      for(const url of expandUrlModifiers(item)){
        urlMap[url] = true;
      }
    }
  }

  if (options.checkAdUrls) {
    addToMap(getUrlsBySelector(AdsApp.ads()
                               .withCondition(labelCondition(true))));
  }

  if (options.checkKeywordUrls) {
    addToMap(getUrlsBySelector(AdsApp.keywords()
                               .withCondition(labelCondition(true))));
  }

  if (options.checkSitelinkUrls) {
    addToMap(getAlreadyCheckedSitelinkUrls());
  }

  return urlMap;
}

/**
 * Retrieves all final URLs and mobile final URLs for campaign and ad group
 * sitelinks.
 *
 * @return {Array.<string>} An array of URLs.
 */
function getAlreadyCheckedSitelinkUrls() {
  const urls = [];

  // Helper method to get campaign or ad group sitelink URLs.
  function addSitelinkUrls(selector) {
    const iterator = selector.withCondition(labelCondition(true)).get();

    for (const entity of iterator) {
      const sitelinks = entity.extensions().sitelinks();
      urls.push(...getUrlsBySelector(sitelinks));
    }
  }

  addSitelinkUrls(AdsApp.campaigns());
  addSitelinkUrls(AdsApp.adGroups());

  return urls;
}

/**
 * Retrieves all URLs in the entities specified by a selector.
 *
 * @param {Object} selector The selector specifying the entities to use.
 *     The entities should be of a type that has a urls() method.
 * @return {Array.<string>} An array of URLs.
 */
function getUrlsBySelector(selector) {
  const urls = [];
  const entities = selector.get();

  // Helper method to add the url to the list if it exists.
  function addToList(url) {
    if (url) {
      urls.push(url);
    }
  }

  for (const entity of entities) {
    addToList(entity.urls().getFinalUrl());
    addToList(entity.urls().getMobileFinalUrl());
  }

  return urls;
}

/**
 * Retrieves all final URLs and mobile final URLs in the account across ads,
 * keywords, and sitelinks, and checks their response code. Does not check
 * previously checked URLs.
 *
 * @param {Object} checkedUrls A map of previously checked URLs with the URL as
 *     the key.
 * @param {Array.<Object>} urlChecks An array into which the results of each URL
 *     check will be inserted.
 * @param {Object} options Dictionary of options.
 * @return {boolean} True if all URLs were checked.
 */
function checkUrls(checkedUrls, urlChecks, options) {
  let didComplete = true;

  // Helper method to add common conditions to ad group and keyword selectors.
  function addConditionsForAds(selector, includePaused) {
    const statuses = ['ENABLED'];
    if (includePaused) {
      statuses.push('PAUSED');
    }

    const predicate = ` IN (${statuses.join(',')})`;
    return selector.withCondition(labelCondition(false))
        .withCondition(`ad_group_ad.status${predicate}`)
        .withCondition(`campaign.status${predicate}`)
        .withCondition(`ad_group.status${predicate}`);
  }

  function addConditionsForKeywords(selector, includePaused) {
    const statuses = ['ENABLED'];
    if (includePaused) {
      statuses.push('PAUSED');
    }

    const predicate = ` IN (${statuses.join(',')})`;
    return selector.withCondition(labelCondition(false))
        .withCondition(`ad_group_criterion.status${predicate}`)
        .withCondition(`campaign.status${predicate}`)
        .withCondition(`ad_group.status${predicate}`);
  }

  if (options.checkAdUrls) {
    didComplete = didComplete && checkUrlsBySelector(checkedUrls, urlChecks,
        addConditionsForAds(AdsApp.ads()
                            .withCondition('CreativeFinalUrls != ""'),
                            options.checkPausedAds), options);
  }

  if (options.checkKeywordUrls) {
    didComplete = didComplete && checkUrlsBySelector(checkedUrls, urlChecks,
        addConditionsForKeywords(AdsApp.keywords()
                                 .withCondition('FinalUrls != ""'),
                                 options.checkPausedKeywords), options);
  }

  if (options.checkSitelinkUrls) {
    didComplete = didComplete && checkSitelinkUrls(checkedUrls, urlChecks,
        options);
  }

  return didComplete;
}

/**
 * Retrieves all final URLs and mobile final URLs in a selector and checks them
 * for a valid response code. Does not check previously checked URLs. Labels the
 * entity that it was checked, if possible.
 *
 * @param {Object} checkedUrls A map of previously checked URLs with the URL as
 *     the key.
 * @param {Array.<Object>} urlChecks An array into which the results of each URL
 *     check will be inserted.
 * @param {Object} selector The selector specifying the entities to use.
 *     The entities should be of a type that has a urls() method.
 * @param {!Object} options Dictionary of options.
 * @return {boolean} True if all URLs were checked.
 */
function checkUrlsBySelector(checkedUrls, urlChecks, selector, options) {
  const customerId = AdsApp.currentAccount().getCustomerId();
  const iterator = selector.get();
  const entities = [];

  // Helper method to check a URL.
  function checkUrl(entity, url) {
    if (!url) {
      return;
    }

    const urlsToCheck = expandUrlModifiers(url);

    for (const expandedUrl of urlsToCheck) {
      if (checkedUrls[expandedUrl]) {
        continue;
      }

      const entityType = entity.getEntityType();
      const entityDetails = {
        entityType: entityType,
        campaign: entity.getCampaign ? entity.getCampaign().getName() : '',
        adGroup: entity.getAdGroup ? entity.getAdGroup().getName() : '',
        ad: entityType == 'Ad' ? getAdAsText(entity) : '',
        keyword: entityType == 'Keyword' ? entity.getText() : '',
        sitelink: entityType.indexOf('Sitelink') != -1 ?
            entity.getLinkText() : ''
      };

      const responseCode = requestUrl(expandedUrl, options, entityDetails);

      urlChecks.push({
        customerId: customerId,
        timestamp: new Date(),
        url: expandedUrl,
        responseCode: responseCode,
        entityType: entityDetails.entityType,
        campaign: entityDetails.campaign,
        adGroup: entityDetails.adGroup,
        ad: entityDetails.ad,
        keyword: entityDetails.keyword,
        sitelink: entityDetails.sitelink
      });

      checkedUrls[expandedUrl] = true;
    }
  }

  entities.push(...iterator);

  for (const entity of entities) {
    checkUrl(entity, entity.urls().getFinalUrl());
    checkUrl(entity, entity.urls().getMobileFinalUrl());

    // Sitelinks do not have labels.
    if (entity.applyLabel) {
      entity.applyLabel(LABEL);
      checkTimeout();
    }
  }

  // True only if we did not breach an iterator limit.
  return entities.length === iterator.totalNumEntities();
}
/**
 * Retrieves a text representation of an ad, casting the ad to the appropriate
 * type if necessary.
 *
 * @param {Ad} ad The ad object.
 * @return {string} The text representation.
 */
function getAdAsText(ad) {
  // There is no AdTypeSpace method for textAd
  if (ad.getType() === 'TEXT_AD') {
    return ad.getHeadline();
  } else if (ad.isType().expandedTextAd()) {
    const eta = ad.asType().expandedTextAd();
    return eta.getHeadlinePart1() + ' - ' + eta.getHeadlinePart2();
  } else if (ad.isType().gmailImageAd()) {
    return ad.asType().gmailImageAd().getName();
  } else if (ad.isType().gmailMultiProductAd()) {
    return ad.asType().gmailMultiProductAd().getHeadline();
  } else if (ad.isType().gmailSinglePromotionAd()) {
    return ad.asType().gmailSinglePromotionAd().getHeadline();
  } else if (ad.isType().html5Ad()) {
    return ad.asType().html5Ad().getName();
  } else if (ad.isType().imageAd()) {
    return ad.asType().imageAd().getName();
  } else if (ad.isType().responsiveDisplayAd()) {
    return ad.asType().responsiveDisplayAd().getLongHeadline();
  } else if (ad.isType().responsiveSearchAd()) {
    return ad.asType()
        .responsiveSearchAd()
        .getHeadlines()
        .map(h => h.text)
        .join(', ');
  }
  return 'N/A';
}

/**
 * Retrieves all final URLs and mobile final URLs for campaign and ad group
 * sitelinks and checks them for a valid response code. Does not check
 * previously checked URLs. Labels the containing campaign or ad group that it
 * has been checked.
 *
 * @param {Object} checkedUrls A map of previously checked URLs with the URL as
 *     the key.
 * @param {Array.<Object>} urlChecks An array into which the results of each URL
 *     check will be inserted.
 * @param {Object} options Dictionary of options.
 * @return {boolean} True if all URLs were checked.
 */
function checkSitelinkUrls(checkedUrls, urlChecks, options) {
  let didComplete = true;

  // Helper method to check URLs for sitelinks in a campaign or ad group
  // selector.
  function checkSitelinkUrls(selector) {
    const iterator = selector.withCondition(labelCondition(false)).get();
    const entities = [];

    for (const iteratorElement of iterator) {
      entities.push(iteratorElement);
    }

    for (const entity of entities) {
      const sitelinks = entity.extensions().sitelinks();

      if (sitelinks.get().hasNext()) {
        didComplete = didComplete &&
            checkUrlsBySelector(checkedUrls, urlChecks, sitelinks, options);
        entity.applyLabel(LABEL);
        checkTimeout();
      }
    }

    // True only if we did not breach an iterator limit.
    didComplete = didComplete &&
        entities.length === iterator.totalNumEntities();
  }

  const statuses = ['ENABLED'];
  if (options.checkPausedSitelinks) {
    statuses.push('PAUSED');
  }

  const predicate = ` IN (${statuses.join(',')})`;
  checkSitelinkUrls(AdsApp.campaigns()
                    .withCondition(`campaign.status${predicate}`));
  checkSitelinkUrls(AdsApp.adGroups()
                    .withCondition(`ad_group.status${predicate}`)
                    .withCondition(`campaign.status${predicate}`));

  return didComplete;
}

/**
 * Expands a URL that contains ValueTrack parameters such as {ifmobile:mobile}
 * to all the combinations, and returns as an array. The following pairs of
 * ValueTrack parameters are currently expanded:
 *     1. {ifmobile:<...>} and {ifnotmobile:<...>} to produce URLs simulating
 *        clicks from either mobile or non-mobile devices.
 *     2. {ifsearch:<...>} and {ifcontent:<...>} to produce URLs simulating
 *        clicks on either the search or display networks.
 * Any other ValueTrack parameters or customer parameters are stripped out from
 * the URL entirely.
 *
 * @param {string} url The URL which may contain ValueTrack parameters.
 * @return {!Array.<string>} An array of one or more expanded URLs.
 */
function expandUrlModifiers(url) {
  const ifRegex = /({(if\w+):([^}]+)})/gi;
  const modifiers = {};
  let matches;
  let modifiedUrls;
  while (matches = ifRegex.exec(url)) {
    // Tags are case-insensitive, e.g. IfMobile is valid.
    modifiers[matches[2].toLowerCase()] = {
      substitute: matches[0],
      replacement: matches[3]
    };
  }
  if (Object.keys(modifiers).length) {
    let mobileCombinations;
    if (modifiers.ifmobile || modifiers.ifnotmobile) {
      mobileCombinations =
          pairedUrlModifierReplace(modifiers, 'ifmobile', 'ifnotmobile', url);
    } else {
      mobileCombinations = [url];
    }

    // Store in a map on the offchance that there are duplicates.
    const combinations = {};
    for (const url of mobileCombinations) {
      if (modifiers.ifsearch || modifiers.ifcontent) {
        for (const modifiedUrl of
            pairedUrlModifierReplace(modifiers, 'ifsearch', 'ifcontent', url)) {
          combinations[modifiedUrl] = true;
        }
      } else {
        combinations[url] = true;
      }
    }
    modifiedUrls = Object.keys(combinations);
  } else {
    modifiedUrls = [url];
  }
  // Remove any custom parameters
  return modifiedUrls.map(url => url.replace(/{[\w_+:]+}/g, ''));
}

/**
 * Return a pair of URLs, where each of the two modifiers is mutually exclusive,
 * one for each combination. e.g. Evaluating ifmobile and ifnotmobile for a
 * mobile and a non-mobile scenario.
 *
 * @param {Object} modifiers A map of ValueTrack modifiers.
 * @param {string} modifier1 The modifier to honour in the URL.
 * @param {string} modifier2 The modifier to remove from the URL.
 * @param {string} url The URL potentially containing ValueTrack parameters.
 * @return {Array.<string>} A pair of URLs, as a list.
 */
function pairedUrlModifierReplace(modifiers, modifier1, modifier2, url) {
  return [
    urlModifierReplace(modifiers, modifier1, modifier2, url),
    urlModifierReplace(modifiers, modifier2, modifier1, url)
  ];
}

/**
 * Produces a URL where the first {if...} modifier is set, and the second is
 * deleted.
 *
 * @param {Object} mods A map of ValueTrack modifiers.
 * @param {string} mod1 The modifier to honour in the URL.
 * @param {string} mod2 The modifier to remove from the URL.
 * @param {string} url The URL potentially containing ValueTrack parameters.
 * @return {string} The resulting URL with substitions.
 */
function urlModifierReplace(mods, mod1, mod2, url) {
  const modUrl = mods[mod1] ?
      url.replace(mods[mod1].substitute, mods[mod1].replacement) :
      url;
  return mods[mod2] ? modUrl.replace(mods[mod2].substitute, '') : modUrl;
}

/**
 * Requests a given URL. Retries if the UrlFetchApp QPS limit was reached,
 * exponentially backing off on each retry. Throws an exception if it reaches
 * the maximum number of retries. Throws an exception if the UrlFetchApp daily
 * quota limit was reached.
 *
 * @param {string} url The URL to test.
 * @param {!Object} options The options loaded from the configuration sheet.
 * @param {!Object} entityDetails Details of the entity, e.g. type, name etc.
 * @return {number|string} The response code received when requesting the URL,
 *     or an error message.
 */
function requestUrl(url, options, entityDetails) {
  let responseCode;
  let sleepTimeMillis = QUOTA_CONFIG.INIT_SLEEP_TIME_MILLIS;
  let numTries = 0;

  while (numTries < QUOTA_CONFIG.MAX_TRIES && !responseCode) {
    try {
      // If UrlFetchApp.fetch() throws an exception, responseCode will remain
      // undefined.
      const response = UrlFetchApp.fetch(url, {muteHttpExceptions: true});
      responseCode = response.getResponseCode();

      if (options.validCodes.indexOf(responseCode) !== -1) {
        if (options.useSimpleFailureStrings &&
            bodyContainsFailureStrings(response, options.failureStrings)) {
          responseCode = 'Failure string detected';
        } else if (options.useCustomValidation && !isValidResponse(url,
            response, options, entityDetails)) {
          responseCode = "Custom validation failed";
        }
      }

      if (THROTTLE_SECONDS > 0) {
        Utilities.sleep(THROTTLE_SECONDS * MILLISECONDS_PER_SECOND);
      }
    } catch(e) {
      if (e.message.indexOf('Service invoked too many times in a short time:')
          != -1) {
        Utilities.sleep(sleepTimeMillis);
        sleepTimeMillis *= QUOTA_CONFIG.BACKOFF_FACTOR;
      } else if (e.message.indexOf('Service invoked too many times:') != -1) {
        throw EXCEPTIONS.LIMIT;
      } else {
        return e.message;
      }
    }

    numTries++;
  }

  if (!responseCode) {
    throw EXCEPTIONS.QPS;
  } else {
    return responseCode;
  }
}

/**
 * Searches the body of a HTTP response for any occurrence of a "failure string"
 * as defined in the configuration spreadsheet. For example, "Out of stock".
 *
 * @param {!HTTPResponse} response The response from the UrlFetchApp request.
 * @param {!Array.<string>} failureStrings A list of failure strings.
 * @return {boolean} Returns true if at least one failure string found.
 */
function bodyContainsFailureStrings(response, failureStrings) {
  const contentText = response.getContentText() || '';
  // Whilst searching for each separate failure string across the body text
  // separately may not be the most efficient, it is simple, and tests suggest
  // it is not overly poor performance-wise.
  return failureStrings.some(
    failureString => contentText.indexOf(failureString) !== -1);
}

/**
 * Throws an exception if the script is close to timing out.
 */
function checkTimeout() {
  if (AdsApp.getExecutionInfo().getRemainingTime() < TIMEOUT_BUFFER_SECONDS) {
    throw EXCEPTIONS.TIMEOUT;
  }
}

/**
 * Returns the number of days between two dates.
 *
 * @param {Object} from The older Date object.
 * @param {Object} to The newer (more recent) Date object.
 * @return {number} The number of days between the given dates (possibly
 *     fractional).
 */
function dayDifference(from, to) {
  return (to.getTime() - from.getTime()) / (24 * 3600 * 1000);
}

/**
 * Builds a string to be used for withCondition() filtering for whether the
 * label is present or not.
 *
 * @param {boolean} hasLabel True if the label should be present, false if the
 *     label should not be present.
 * @return {string} A condition that can be used in withCondition().
 */
function labelCondition(hasLabel) {
  return `LabelNames ${(hasLabel ? `CONTAINS_ANY` : `CONTAINS_NONE`)}` +
      ` ["${LABEL}"]`;
}

/**
 * Retrieves an entity by name.
 *
 * @param {Object} selector A selector for an entity type with a Name field.
 * @param {string} name The name to retrieve the entity by.
 * @return {Object} The entity, if it exists, or null otherwise.
 */
function getEntityByName(selector, name) {
  const entities = selector.withCondition(`Name = "${name}"`).get();

  if (entities.hasNext()) {
    return entities.next();
  } else {
    return null;
  }
}

/**
 * Retrieves a Label object by name.
 *
 * @param {string} labelName The label name to retrieve.
 * @return {Object} The Label object, if it exists, or null otherwise.
 */
function getLabel(labelName) {
  return getEntityByName(AdsApp.labels(), labelName);
}

/**
 * Retrieves an AccountLabel object by name.
 *
 * @param {string} labelName The label name to retrieve.
 * @return {Object} The AccountLabel object, if it exists, or null otherwise.
 */
function getAccountLabel(labelName) {
  return getEntityByName(AdsManagerApp.accountLabels(), labelName);
}

/**
 * Checks that the account has all provided labels and creates any that are
 * missing. Since labels cannot be created in preview mode, throws an exception
 * if a label is missing.
 *
 * @param {Array.<string>} labelNames An array of label names.
 */
function ensureLabels(labelNames) {
  for (const labelName of labelNames) {
    const label = getLabel(labelName);

    if (!label) {
      if (!AdsApp.getExecutionInfo().isPreview()) {
        AdsApp.createLabel(labelName);
      } else {
        throw `Label ${labelName} is missing and cannot be created in ` +
            `preview mode. Please run the script or create the label manually.`;
      }
    }
  }
}

/**
 * Checks that the account has all provided account labels and creates any that
 * are missing. Since labels cannot be created in preview mode, throws an
 * exception if a label is missing.
 *
 * @param {Array.<string>} labelNames An array of label names.
 */
function ensureAccountLabels(labelNames) {
  for (const labelName of labelNames) {
    const label = getLabel(labelName);

    if (!label) {
      if (!AdsApp.getExecutionInfo().isPreview()) {
        AdsManagerApp.createAccountLabel(labelName);
      } else {
        throw `Account label ${labelName} is missing and cannot be ` +
            `created in preview mode. Please run the script or create the ` +
            `label manually.`;
      }
    }
  }
}

/**
 * Removes all provided labels from the account. Since labels cannot be removed
 * in preview mode, throws an exception in preview mode.
 *
 * @param {Array.<string>} labelNames An array of label names.
 */
function removeLabels(labelNames) {
  if (AdsApp.getExecutionInfo().isPreview()) {
    throw 'Cannot remove labels in preview mode. Please run the script or ' +
        'remove the labels manually.';
  }

  for (const labelName of labelNames) {
    const label = getLabel(labelName);

    if (label) {
      label.remove();
    }
  }
}

/**
 * Removes all provided account labels from the account. Since labels cannot be
 * removed in preview mode, throws an exception in preview mode.
 *
 * @param {Array.<string>} labelNames An array of label names.
 */
function removeAccountLabels(labelNames) {
  if (AdsApp.getExecutionInfo().isPreview()) {
    throw 'Cannot remove account labels in preview mode. Please run the ' +
        'script or remove the labels manually.';
  }

  for (const labelName of labelNames) {
    const label = getLabel(labelName);

    if (label) {
      label.remove();
    }
  }
}

/**
 * Validates the provided spreadsheet URL to make sure that it's set up
 * properly. Throws a descriptive error message if validation fails.
 *
 * @param {string} spreadsheeturl The URL of the spreadsheet to open.
 * @return {Spreadsheet} The spreadsheet object itself, fetched from the URL.
 * @throws {Error} If the spreadsheet URL hasn't been set
 */
function validateAndGetSpreadsheet(spreadsheeturl) {
  if (spreadsheeturl == 'YOUR_SPREADSHEET_URL') {
    throw new Error('Please specify a valid Spreadsheet URL. You can find' +
        ' a link to a template in the associated guide for this script.');
  }
  return SpreadsheetApp.openByUrl(spreadsheeturl);
}

/**
 * Validates the provided email address to make sure it's not the default.
 * Throws a descriptive error message if validation fails.
 *
 * @throws {Error} If the list of email addresses is still the default
 */
function validateEmailAddresses() {
  if (RECIPIENT_EMAILS && RECIPIENT_EMAILS[0] == 'YOUR_EMAIL_HERE') {
    throw new Error('Please either specify a valid email address or clear' +
        ' the RECIPIENT_EMAILS field.');
  }
}