prebid/Prebid.js

/**
 * This module adds SharedId to the User ID module
 * The {@link module:modules/userId} module is required
 * @module modules/sharedIdSystem
 * @requires module:modules/userId
 */

import {parseUrl, buildUrl, triggerPixel, logInfo, hasDeviceAccess, generateUUID} from '../src/utils.js';
import {submodule} from '../src/hook.js';
import {coppaDataHandler} from '../src/adapterManager.js';
import {getStorageManager} from '../src/storageManager.js';
import {VENDORLESS_GVLID} from '../src/consentHandler.js';
import {MODULE_TYPE_UID} from '../src/activities/modules.js';
import {domainOverrideToRootDomain} from '../libraries/domainOverrideToRootDomain/index.js';

/**
 * @typedef {import('../modules/userId/index.js').Submodule} Submodule
 * @typedef {import('../modules/userId/index.js').SubmoduleConfig} SubmoduleConfig
 * @typedef {import('../modules/userId/index.js').SubmoduleParams} SubmoduleParams
 * @typedef {import('../modules/userId/index.js').ConsentData} ConsentData
 * @typedef {import('../modules/userId/index.js').IdResponse} IdResponse
 */

export const storage = getStorageManager({moduleType: MODULE_TYPE_UID, moduleName: 'sharedId'});
const COOKIE = 'cookie';
const LOCAL_STORAGE = 'html5';
const OPTOUT_NAME = '_pubcid_optout';
const PUB_COMMON_ID = 'PublisherCommonId';

/**
 * Read a value either from cookie or local storage
 * @param {string} name Name of the item
 * @param {string} type storage type override
 * @returns {string|null} a string if item exists
 */
function readValue(name, type) {
  if (type === COOKIE) {
    return storage.getCookie(name);
  } else if (type === LOCAL_STORAGE) {
    if (storage.hasLocalStorage()) {
      const expValue = storage.getDataFromLocalStorage(`${name}_exp`);
      if (!expValue) {
        return storage.getDataFromLocalStorage(name);
      } else if ((new Date(expValue)).getTime() - Date.now() > 0) {
        return storage.getDataFromLocalStorage(name)
      }
    }
  }
}

function getIdCallback(pubcid, pixelUrl) {
  return function (callback, getStoredId) {
    if (pixelUrl) {
      queuePixelCallback(pixelUrl, pubcid, () => {
        callback(getStoredId() || pubcid);
      })();
    } else {
      callback(pubcid);
    }
  }
}

function queuePixelCallback(pixelUrl, id = '', callback) {
  if (!pixelUrl) {
    return;
  }

  // Use pubcid as a cache buster
  const urlInfo = parseUrl(pixelUrl);
  urlInfo.search.id = encodeURIComponent('pubcid:' + id);
  const targetUrl = buildUrl(urlInfo);

  return function () {
    triggerPixel(targetUrl, callback);
  };
}

function hasOptedOut() {
  return !!((storage.cookiesAreEnabled() && readValue(OPTOUT_NAME, COOKIE)) ||
    (storage.hasLocalStorage() && readValue(OPTOUT_NAME, LOCAL_STORAGE)));
}

export const sharedIdSystemSubmodule = {
  /**
   * used to link submodule with config
   * @type {string}
   */
  name: 'sharedId',
  aliasName: 'pubCommonId',
  gvlid: VENDORLESS_GVLID,

  /**
   * decode the stored id value for passing to bid requests
   * @function
   * @param {string} value
   * @param {SubmoduleConfig} config
   * @returns {{pubcid:string}}
   */
  decode(value, config) {
    if (hasOptedOut()) {
      logInfo('PubCommonId decode: Has opted-out');
      return undefined;
    }
    logInfo(' Decoded value PubCommonId ' + value);
    const idObj = {'pubcid': value};
    return idObj;
  },
  /**
   * performs action to obtain id
   * @function
   * @param {SubmoduleConfig} [config] Config object with params and storage properties
   * @param {Object} consentData
   * @param {string} storedId Existing pubcommon id
   * @returns {IdResponse}
   */
  getId: function (config = {}, consentData, storedId) {
    if (hasOptedOut()) {
      logInfo('PubCommonId: Has opted-out');
      return;
    }
    const coppa = coppaDataHandler.getCoppa();

    if (coppa) {
      logInfo('PubCommonId: IDs not provided for coppa requests, exiting PubCommonId');
      return;
    }
    const {params: {create = true, pixelUrl} = {}} = config;
    let newId = storedId;
    if (!newId) {
      try {
        if (typeof window[PUB_COMMON_ID] === 'object') {
          // If the page includes its own pubcid module, then save a copy of id.
          newId = window[PUB_COMMON_ID].getId();
        }
      } catch (e) {
      }

      if (!newId) newId = (create && hasDeviceAccess()) ? generateUUID() : undefined;
    }

    return {id: newId, callback: getIdCallback(newId, pixelUrl)};
  },
  /**
   * performs action to extend an id.  There are generally two ways to extend the expiration time
   * of stored id: using pixelUrl or return the id and let main user id module write it again with
   * the new expiration time.
   *
   * PixelUrl, if defined, should point back to a first party domain endpoint.  On the server
   * side, there is either a plugin, or customized logic to read and write back the pubcid cookie.
   * The extendId function itself should return only the callback, and not the id itself to avoid
   * having the script-side overwriting server-side.  This applies to both pubcid and sharedid.
   *
   * On the other hand, if there is no pixelUrl, then the extendId should return storedId so that
   * its expiration time is updated.
   *
   * @function
   * @param {SubmoduleParams} [config]
   * @param {ConsentData|undefined} consentData
   * @param {Object} storedId existing id
   * @returns {IdResponse|undefined}
   */
  extendId: function(config = {}, consentData, storedId) {
    if (hasOptedOut()) {
      logInfo('PubCommonId: Has opted-out');
      return {id: undefined};
    }
    const coppa = coppaDataHandler.getCoppa();
    if (coppa) {
      logInfo('PubCommonId: IDs not provided for coppa requests, exiting PubCommonId');
      return;
    }
    const {params: {extend = false, pixelUrl} = {}} = config;

    if (extend) {
      if (pixelUrl) {
        const callback = queuePixelCallback(pixelUrl, storedId);
        return {callback: callback};
      } else {
        return {id: storedId};
      }
    }
  },

  domainOverride: domainOverrideToRootDomain(storage, 'sharedId'),
  eids: {
    'pubcid': {
      source: 'pubcid.org',
      atype: 1
    },
  }
};

submodule('userId', sharedIdSystemSubmodule);