src/storageManager.js

import {hook} from './hook.js';
import {hasDeviceAccess, checkCookieSupport, logError, logInfo, isPlainObject} from 'https://github.com/prebid/Prebid.js/blob/3fd3b5dca5dcc3fcd9f3c949e8e1a3238ea6b836/src/utils.js';
import {includes} from 'https://github.com/prebid/Prebid.js/blob/3fd3b5dca5dcc3fcd9f3c949e8e1a3238ea6b836/src/polyfill.js';
import {bidderSettings as defaultBidderSettings} from 'https://github.com/prebid/Prebid.js/blob/3fd3b5dca5dcc3fcd9f3c949e8e1a3238ea6b836/src/bidderSettings.js';

const moduleTypeWhiteList = ['core', 'prebid-module'];

export let storageCallbacks = [];

/**
 * Storage options
 * @typedef {Object} storageOptions
 * @property {Number=} gvlid - Vendor id
 * @property {string} moduleName? - Module name
 * @property {string=} bidderCode? - Bidder code
 * @property {string=} moduleType - Module type, value can be anyone of core or prebid-module
 */

/**
 * Returns list of storage related functions with gvlid, module name and module type in its scope.
 * All three argument are optional here. Below shows the usage of of these
 * - GVL Id: Pass GVL id if you are a vendor
 * - Bidder code: All bid adapters need to pass bidderCode
 * - Module name: All other modules need to pass module name
 * - Module type: Some modules may need these functions but are not vendor. e.g prebid core files in src and modules like currency.
 * @param {storageOptions} options
 */
export function newStorageManager({gvlid, moduleName, bidderCode, moduleType} = {}, {bidderSettings = defaultBidderSettings} = {}) {
  function isBidderDisallowed() {
    if (bidderCode == null) {
      return false;
    }
    const storageAllowed = bidderSettings.get(bidderCode, 'storageAllowed');
    return storageAllowed == null ? false : !storageAllowed;
  }
  function isValid(cb) {
    if (includes(moduleTypeWhiteList, moduleType)) {
      let result = {
        valid: true
      }
      return cb(result);
    } else if (isBidderDisallowed()) {
      logInfo(`bidderSettings denied access to device storage for bidder '${bidderCode}'`);
      const result = {valid: false};
      return cb(result);
    } else {
      let value;
      let hookDetails = {
        hasEnforcementHook: false
      }
      validateStorageEnforcement(gvlid, bidderCode || moduleName, hookDetails, function(result) {
        if (result && result.hasEnforcementHook) {
          value = cb(result);
        } else {
          let result = {
            hasEnforcementHook: false,
            valid: hasDeviceAccess()
          }
          value = cb(result);
        }
      });
      return value;
    }
  }

  /**
   * @param {string} key
   * @param {string} value
   * @param {string} [expires='']
   * @param {string} [sameSite='/']
   * @param {string} [domain] domain (e.g., 'example.com' or 'subdomain.example.com').
   * If not specified, defaults to the host portion of the current document location.
   * If a domain is specified, subdomains are always included.
   * Domain must match the domain of the JavaScript origin. Setting cookies to foreign domains will be silently ignored.
   */
  const setCookie = function (key, value, expires, sameSite, domain, done) {
    let cb = function (result) {
      if (result && result.valid) {
        const domainPortion = (domain && domain !== '') ? ` ;domain=${encodeURIComponent(domain)}` : '';
        const expiresPortion = (expires && expires !== '') ? ` ;expires=${expires}` : '';
        const isNone = (sameSite != null && sameSite.toLowerCase() == 'none')
        const secure = (isNone) ? '; Secure' : '';
        document.cookie = `${key}=${encodeURIComponent(value)}${expiresPortion}; path=/${domainPortion}${sameSite ? `; SameSite=${sameSite}` : ''}${secure}`;
      }
    }
    if (done && typeof done === 'function') {
      storageCallbacks.push(function() {
        let result = isValid(cb);
        done(result);
      });
    } else {
      return isValid(cb);
    }
  };

  /**
   * @param {string} name
   * @returns {(string|null)}
   */
  const getCookie = function(name, done) {
    let cb = function (result) {
      if (result && result.valid) {
        let m = window.document.cookie.match('(^|;)\\s*' + name + '\\s*=\\s*([^;]*)\\s*(;|$)');
        return m ? decodeURIComponent(m[2]) : null;
      }
      return null;
    }
    if (done && typeof done === 'function') {
      storageCallbacks.push(function() {
        let result = isValid(cb);
        done(result);
      });
    } else {
      return isValid(cb);
    }
  };

  /**
   * @returns {boolean}
   */
  const localStorageIsEnabled = function (done) {
    let cb = function (result) {
      if (result && result.valid) {
        try {
          localStorage.setItem('prebid.cookieTest', '1');
          return localStorage.getItem('prebid.cookieTest') === '1';
        } catch (error) {
        } finally {
          try {
            localStorage.removeItem('prebid.cookieTest');
          } catch (error) {}
        }
      }
      return false;
    }
    if (done && typeof done === 'function') {
      storageCallbacks.push(function() {
        let result = isValid(cb);
        done(result);
      });
    } else {
      return isValid(cb);
    }
  }

  /**
   * @returns {boolean}
   */
  const cookiesAreEnabled = function (done) {
    let cb = function (result) {
      if (result && result.valid) {
        if (checkCookieSupport()) {
          return true;
        }
        window.document.cookie = 'prebid.cookieTest';
        return window.document.cookie.indexOf('prebid.cookieTest') !== -1;
      }
      return false;
    }
    if (done && typeof done === 'function') {
      storageCallbacks.push(function() {
        let result = isValid(cb);
        done(result);
      });
    } else {
      return isValid(cb);
    }
  }

  /**
   * @param {string} key
   * @param {string} value
   */
  const setDataInLocalStorage = function (key, value, done) {
    let cb = function (result) {
      if (result && result.valid && hasLocalStorage()) {
        window.localStorage.setItem(key, value);
      }
    }
    if (done && typeof done === 'function') {
      storageCallbacks.push(function() {
        let result = isValid(cb);
        done(result);
      });
    } else {
      return isValid(cb);
    }
  }

  /**
   * @param {string} key
   * @returns {(string|null)}
   */
  const getDataFromLocalStorage = function (key, done) {
    let cb = function (result) {
      if (result && result.valid && hasLocalStorage()) {
        return window.localStorage.getItem(key);
      }
      return null;
    }
    if (done && typeof done === 'function') {
      storageCallbacks.push(function() {
        let result = isValid(cb);
        done(result);
      });
    } else {
      return isValid(cb);
    }
  }

  /**
   * @param {string} key
   */
  const removeDataFromLocalStorage = function (key, done) {
    let cb = function (result) {
      if (result && result.valid && hasLocalStorage()) {
        window.localStorage.removeItem(key);
      }
    }
    if (done && typeof done === 'function') {
      storageCallbacks.push(function() {
        let result = isValid(cb);
        done(result);
      });
    } else {
      return isValid(cb);
    }
  }

  /**
   * @returns {boolean}
   */
  const hasLocalStorage = function (done) {
    let cb = function (result) {
      if (result && result.valid) {
        try {
          return !!window.localStorage;
        } catch (e) {
          logError('Local storage api disabled');
        }
      }
      return false;
    }
    if (done && typeof done === 'function') {
      storageCallbacks.push(function() {
        let result = isValid(cb);
        done(result);
      });
    } else {
      return isValid(cb);
    }
  }

  /**
   * Returns all cookie values from the jar whose names contain the `keyLike`
   * Needs to exist in `utils.js` as it follows the StorageHandler interface defined in live-connect-js. If that module were to be removed, this function can go as well.
   * @param {string} keyLike
   * @return {[]}
   */
  const findSimilarCookies = function(keyLike, done) {
    let cb = function (result) {
      if (result && result.valid) {
        const all = [];
        if (hasDeviceAccess()) {
          const cookies = document.cookie.split(';');
          while (cookies.length) {
            const cookie = cookies.pop();
            let separatorIndex = cookie.indexOf('=');
            separatorIndex = separatorIndex < 0 ? cookie.length : separatorIndex;
            const cookieName = decodeURIComponent(cookie.slice(0, separatorIndex).replace(/^\s+/, ''));
            if (cookieName.indexOf(keyLike) >= 0) {
              all.push(decodeURIComponent(cookie.slice(separatorIndex + 1)));
            }
          }
        }
        return all;
      }
    }

    if (done && typeof done === 'function') {
      storageCallbacks.push(function() {
        let result = isValid(cb);
        done(result);
      });
    } else {
      return isValid(cb);
    }
  }

  return {
    setCookie,
    getCookie,
    localStorageIsEnabled,
    cookiesAreEnabled,
    setDataInLocalStorage,
    getDataFromLocalStorage,
    removeDataFromLocalStorage,
    hasLocalStorage,
    findSimilarCookies
  }
}

/**
 * This hook validates the storage enforcement if gdprEnforcement module is included
 */
export const validateStorageEnforcement = hook('async', function(gvlid, moduleName, hookDetails, callback) {
  callback(hookDetails);
}, 'validateStorageEnforcement');

/**
 * This function returns storage functions to access cookies and localstorage. This function will bypass the gdpr enforcement requirement. Prebid as a software needs to use storage in some scenarios and is not a vendor so GDPR enforcement rules does not apply on Prebid.
 * @param {string} moduleName Module name
 */
export function getCoreStorageManager(moduleName) {
  return newStorageManager({moduleName: moduleName, moduleType: 'core'});
}

/**
 * Note: Core modules or Prebid modules like Currency, SizeMapping should use getCoreStorageManager
 * This function returns storage functions to access cookies and localstorage. Bidders and User id modules should import this and use it in their module if needed.
 * Bid adapters should always provide `bidderCode`. GVL ID and Module name are optional param but gvl id is needed for when gdpr enforcement module is used.
 * @param {Number=} gvlid? Vendor id - required for proper GDPR integration
 * @param {string=} bidderCode? - required for bid adapters
 * @param {string=} moduleName? module name
 */
export function getStorageManager({gvlid, moduleName, bidderCode} = {}) {
  if (arguments.length > 1 || (arguments.length > 0 && !isPlainObject(arguments[0]))) {
    throw new Error('Invalid invocation for getStorageManager')
  }
  return newStorageManager({gvlid, moduleName, bidderCode});
}

export function resetData() {
  storageCallbacks = [];
}