rxdb-server/dist/esm/plugins/server/helper.js

RxDB Server Plugin

import { flatClone, getFromMapOrCreate, getQueryMatcher, normalizeMangoQuery, uniqueArray } from 'rxdb/plugins/core';
export function setCors(server, path, cors) {
  var useCors = cors;
  if (!useCors) {
    useCors = server.cors;
  }
  if (useCors) {
    server.adapter.setCors(server.serverApp, path, useCors);
  }
}
var AUTH_PER_REQUEST = new WeakMap();
export async function getAuthDataByRequest(server, request, response) {
  return getFromMapOrCreate(AUTH_PER_REQUEST, request, async () => {
    try {
      var headers = server.adapter.getRequestHeaders(request);
      var authData = await server.authHandler(headers);
      return authData;
    } catch (err) {
      server.adapter.closeConnection(response, 401, 'Unauthorized');
      return false;
    }
  });
}
;
var defaultMatchingQuery = {
  selector: {},
  skip: 0,
  sort: []
};
export function getDocAllowedMatcher(endpoint, authData) {
  var useQuery = endpoint.queryModifier ? endpoint.queryModifier(authData, normalizeMangoQuery(endpoint.collection.schema.jsonSchema, {})) : defaultMatchingQuery;
  var docDataMatcher = getQueryMatcher(endpoint.collection.schema.jsonSchema, useQuery);
  return docDataMatcher;
}
export function docContainsServerOnlyFields(serverOnlyFields, doc) {
  var has = serverOnlyFields.find(field => {
    return typeof doc[field] !== 'undefined';
  });
  return has;
}
export function removeServerOnlyFieldsMonad(serverOnlyFields) {
  var serverOnlyFieldsStencil = {
    _meta: undefined,
    _rev: undefined,
    _attachments: undefined
  };
  serverOnlyFields.forEach(field => serverOnlyFieldsStencil[field] = undefined);
  return docData => {
    if (!docData) {
      return docData;
    }
    return Object.assign({}, docData, serverOnlyFieldsStencil);
  };
}
export function mergeServerDocumentFieldsMonad(serverOnlyFields) {
  var useFields = serverOnlyFields.slice(0);
  // useFields.push('_rev');
  // useFields.push('_meta');
  // useFields.push('_attachments');
  useFields = uniqueArray(useFields);
  return (clientDoc, serverDoc) => {
    if (!serverDoc) {
      return clientDoc;
    }
    var ret = flatClone(clientDoc);
    useFields.forEach(field => {
      ret[field] = serverDoc[field];
    });
    return ret;
  };
}

/**
 * $regex queries are dangerous because they can dos-attack the server.
 * 
 * @param selector 
 */
export function doesContainRegexQuerySelector(selector) {
  if (!selector) {
    return false;
  }
  if (Array.isArray(selector)) {
    var found = !!selector.find(item => doesContainRegexQuerySelector(item));
    return found;
  }
  if (typeof selector !== 'object') {
    return false;
  }
  var entries = Object.entries(selector);
  for (var [key, value] of entries) {
    if (key === '$regex') {
      return true;
    } else {
      var has = doesContainRegexQuerySelector(value);
      if (has) {
        return true;
      }
    }
  }
  return false;
}
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