399 lines
10 KiB
TypeScript
399 lines
10 KiB
TypeScript
import _ from "lodash";
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import CONSTRAINTS from "../shared/validation/constraints";
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import ErrorTypes from "./errorTypes";
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import Logger from "../logger";
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import {
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Constraints,
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forConstraints,
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isConstraints,
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NestedConstraints,
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} from "../shared/validation/validator";
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import { Request, Response } from "express";
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import {
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EnumTypeGuard,
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EnumValue,
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type GenericSortField,
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getFieldIfExists,
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isJSONObject,
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isNumber,
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isString,
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isUndefined,
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JSONObject,
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JSONValue,
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SortDirection,
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TypeGuard,
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} from "../types";
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export type RequestData = JSONObject;
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export type RequestHandler = (request: Request, response: Response) => void;
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export type Entity = { [key: string]: unknown };
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export type RestParams = {
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q?: string;
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_sortField?: GenericSortField;
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_sortDir?: SortDirection;
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_page: number;
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_perPage: number;
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filters?: FilterClause;
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};
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export type OrderByClause = { query: string; params: unknown[] };
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export type LimitOffsetClause = { query: string; params: unknown[] };
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export type FilterClause = { query: string; params: unknown[] };
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function respond(
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res: Response,
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httpCode: number,
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data: string,
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type: "html"
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): void;
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function respond(
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res: Response,
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httpCode: number,
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data: JSONValue,
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type: "json"
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): void;
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function respond(
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res: Response,
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httpCode: number,
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data: JSONValue,
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type: "html" | "json"
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): void {
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switch (type) {
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case "html":
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res.writeHead(httpCode, { "Content-Type": "text/html" });
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res.end(data);
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break;
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default:
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res.writeHead(httpCode, { "Content-Type": "application/json" });
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res.end(JSON.stringify(data));
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break;
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}
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}
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function orderByClause<S>(
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restParams: RestParams,
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defaultSortField: EnumValue<S>,
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isSortField: EnumTypeGuard<S>
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): OrderByClause {
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let sortField: EnumValue<S> | undefined = isSortField(restParams._sortField)
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? restParams._sortField
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: undefined;
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if (!sortField) {
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sortField = defaultSortField;
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}
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return {
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query:
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"ORDER BY LOWER(" +
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sortField +
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") " +
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(restParams._sortDir === SortDirection.ASCENDING ? "ASC" : "DESC"),
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params: [],
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};
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}
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function limitOffsetClause(restParams: RestParams): LimitOffsetClause {
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const page = restParams._page;
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const perPage = restParams._perPage;
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return {
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query: "LIMIT ? OFFSET ?",
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params: [perPage, (page - 1) * perPage],
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};
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}
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function escapeForLikePattern(str: string): string {
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return str.replace(/\\/g, "\\\\").replace(/%/g, "\\%").replace(/_/g, "\\_");
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}
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function filterCondition(
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restParams: RestParams,
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filterFields: string[]
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): FilterClause {
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if (_.isEmpty(filterFields)) {
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return {
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query: "1 = 1",
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params: [],
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};
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}
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let query = filterFields
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.map((field) => "LOWER(" + field + ") LIKE ?")
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.join(" OR ");
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query += " ESCAPE '\\'";
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const search =
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"%" +
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(isString(restParams.q)
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? escapeForLikePattern(restParams.q.trim().toLowerCase())
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: "") +
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"%";
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const params = _.times(filterFields.length, () => search);
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return {
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query: query,
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params: params,
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};
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}
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function getConstrainedValues(
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data: { [key: string]: unknown },
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constraints: Constraints
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): { [key: string]: unknown } {
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const values: { [key: string]: unknown } = {};
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for (const key of Object.keys(constraints)) {
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const value = data[key];
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values[key] =
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isUndefined(value) &&
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key in constraints &&
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!isUndefined(constraints[key].default)
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? constraints[key].default
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: value;
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}
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return values;
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}
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function normalize(data: unknown): JSONObject {
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return isJSONObject(data) ? data : {};
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}
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export function getData(req: Request): RequestData {
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const body = normalize(req.body);
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const params = normalize(req.params);
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const query = normalize(req.query);
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return {
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...body,
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...params,
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...query,
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};
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}
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export async function getValidRestParams(
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type: string,
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subtype: string | null,
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req: Request
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): Promise<RestParams> {
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const restConstraints = CONSTRAINTS.rest as { [key: string]: Constraints };
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if (!(type in restConstraints) || !isConstraints(restConstraints[type])) {
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Logger.tag("validation", "rest").error(
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"Unknown REST resource type: {}",
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type
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);
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throw { data: "Internal error.", type: ErrorTypes.internalError };
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}
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const constraints: Constraints = restConstraints[type];
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let filterConstraints: Constraints = {};
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if (subtype) {
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const subtypeFilters = subtype + "Filters";
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const nestedConstraints = CONSTRAINTS as NestedConstraints;
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const subConstraints = nestedConstraints[subtypeFilters];
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if (!isConstraints(subConstraints)) {
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Logger.tag("validation", "rest").error(
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"Unknown REST resource subtype: {}",
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subtype
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);
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throw { data: "Internal error.", type: ErrorTypes.internalError };
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}
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filterConstraints = subConstraints;
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}
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const data = getData(req);
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const restParams = getConstrainedValues(data, constraints);
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const filterParams = getConstrainedValues(data, filterConstraints);
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const areValidParams = forConstraints(constraints, false);
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const areValidFilters = forConstraints(filterConstraints, false);
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if (!areValidParams(restParams) || !areValidFilters(filterParams)) {
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throw { data: "Invalid REST parameters.", type: ErrorTypes.badRequest };
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}
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restParams.filters = filterParams;
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return restParams as RestParams;
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}
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export function filter<E>(
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entities: E[],
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allowedFilterFields: string[],
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restParams: RestParams
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): E[] {
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let query = restParams.q;
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if (query) {
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query = query.trim().toLowerCase();
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}
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function queryMatches(entity: E): boolean {
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if (!query) {
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return true;
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}
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return allowedFilterFields.some((field: string): boolean => {
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if (!query) {
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return true;
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}
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let value = getFieldIfExists(entity, field);
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if (isNumber(value)) {
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value = value.toString();
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}
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if (!isString(value) || _.isEmpty(value)) {
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return false;
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}
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const lowerCaseValue = value.toLowerCase();
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if (field === "mac") {
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return _.includes(
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lowerCaseValue.replace(/:/g, ""),
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query.replace(/:/g, "")
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);
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}
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return _.includes(lowerCaseValue, query);
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});
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}
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const filters = restParams.filters;
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function filtersMatch(entity: E): boolean {
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if (isUndefined(filters) || _.isEmpty(filters)) {
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return true;
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}
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return Object.entries(filters).every(([key, value]) => {
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if (isUndefined(value)) {
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return true;
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}
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if (key.startsWith("has")) {
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const entityKey =
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key.substring(3, 4).toLowerCase() + key.substring(4);
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return (
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_.isEmpty(
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getFieldIfExists(entity, entityKey)
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).toString() !== value
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);
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}
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return getFieldIfExists(entity, key) === value;
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});
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}
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return entities.filter(
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(entity) => queryMatches(entity) && filtersMatch(entity)
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);
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}
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export function sort<
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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Type extends { [Key in SortField]: any },
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SortField extends string
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>(
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entities: Type[],
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isSortField: TypeGuard<SortField>,
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restParams: RestParams
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): Type[] {
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const sortField: SortField | undefined = isSortField(restParams._sortField)
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? restParams._sortField
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: undefined;
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if (!sortField) {
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return entities;
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}
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const sorted = entities.slice(0);
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sorted.sort((a, b) => {
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let as = a[sortField];
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let bs = b[sortField];
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if (isString(as)) {
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as = as.toLowerCase();
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}
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if (isString(bs)) {
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bs = bs.toLowerCase();
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}
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let order = 0;
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if (as < bs) {
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order = -1;
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} else if (as > bs) {
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order = 1;
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}
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return restParams._sortDir === SortDirection.DESCENDING
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? -order
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: order;
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});
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return sorted;
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}
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export function getPageEntities<Entity>(
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entities: Entity[],
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restParams: RestParams
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): Entity[] {
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const page = restParams._page;
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const perPage = restParams._perPage;
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return entities.slice((page - 1) * perPage, page * perPage);
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}
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export { filterCondition as whereCondition };
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export function filterClause<S>(
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restParams: RestParams,
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defaultSortField: EnumValue<S>,
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isSortField: EnumTypeGuard<S>,
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filterFields: string[]
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): FilterClause {
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const orderBy = orderByClause<S>(restParams, defaultSortField, isSortField);
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const limitOffset = limitOffsetClause(restParams);
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const filter = filterCondition(restParams, filterFields);
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return {
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query: filter.query + " " + orderBy.query + " " + limitOffset.query,
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params: [...filter.params, ...orderBy.params, ...limitOffset.params],
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};
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}
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export function success(res: Response, data: JSONValue) {
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respond(res, 200, data, "json");
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}
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export function successHtml(res: Response, html: string) {
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respond(res, 200, html, "html");
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}
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export function error(
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res: Response,
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err: { data: JSONValue; type: { code: number } }
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) {
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respond(res, err.type.code, err.data, "json");
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}
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export function handleJSON<Response>(
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handler: () => Promise<Response>
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): RequestHandler {
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return (request, response) => {
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handler()
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.then((data) => success(response, data || {}))
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.catch((e) => error(response, e));
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};
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}
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export function handleJSONWithData<Response>(
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handler: (data: RequestData) => Promise<Response>
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): RequestHandler {
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return (request, response) => {
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handler(getData(request))
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.then((data) => success(response, data || {}))
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.catch((e) => error(response, e));
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};
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}
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