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Viewing file:     proto-access.js (2.37 KB)      -rw-r--r--

import { createNewLookupObject } from './create-new-lookup-object';
import * as logger from '../logger';

const loggedProperties = Object.create(null);

export function createProtoAccessControl(runtimeOptions) {
  let defaultMethodWhiteList = Object.create(null);
  defaultMethodWhiteList['constructor'] = false;
  defaultMethodWhiteList['__defineGetter__'] = false;
  defaultMethodWhiteList['__defineSetter__'] = false;
  defaultMethodWhiteList['__lookupGetter__'] = false;

  let defaultPropertyWhiteList = Object.create(null);
  // eslint-disable-next-line no-proto
  defaultPropertyWhiteList['__proto__'] = false;

  return {
    properties: {
      whitelist: createNewLookupObject(
        defaultPropertyWhiteList,
        runtimeOptions.allowedProtoProperties
      ),
      defaultValue: runtimeOptions.allowProtoPropertiesByDefault
    },
    methods: {
      whitelist: createNewLookupObject(
        defaultMethodWhiteList,
        runtimeOptions.allowedProtoMethods
      ),
      defaultValue: runtimeOptions.allowProtoMethodsByDefault
    }
  };
}

export function resultIsAllowed(result, protoAccessControl, propertyName) {
  if (typeof result === 'function') {
    return checkWhiteList(protoAccessControl.methods, propertyName);
  } else {
    return checkWhiteList(protoAccessControl.properties, propertyName);
  }
}

function checkWhiteList(protoAccessControlForType, propertyName) {
  if (protoAccessControlForType.whitelist[propertyName] !== undefined) {
    return protoAccessControlForType.whitelist[propertyName] === true;
  }
  if (protoAccessControlForType.defaultValue !== undefined) {
    return protoAccessControlForType.defaultValue;
  }
  logUnexpecedPropertyAccessOnce(propertyName);
  return false;
}

function logUnexpecedPropertyAccessOnce(propertyName) {
  if (loggedProperties[propertyName] !== true) {
    loggedProperties[propertyName] = true;
    logger.log(
      'error',
      `Handlebars: Access has been denied to resolve the property "${propertyName}" because it is not an "own property" of its parent.\n` +
        `You can add a runtime option to disable the check or this warning:\n` +
        `See https://handlebarsjs.com/api-reference/runtime-options.html#options-to-control-prototype-access for details`
    );
  }
}

export function resetLoggedProperties() {
  Object.keys(loggedProperties).forEach(propertyName => {
    delete loggedProperties[propertyName];
  });
}