108 lines
3.0 KiB
TypeScript
108 lines
3.0 KiB
TypeScript
import { Injectable } from '@nestjs/common';
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import { Request } from 'express';
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@Injectable()
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export class FormUtilityService {
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public emailRegex =
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/^[-!#$%&'*+\/0-9=?A-Z^_a-z`{|}~](\.?[-!#$%&'*+\/0-9=?A-Z^_a-z`{|}~])*@[a-zA-Z0-9](-*\.?[a-zA-Z0-9])*\.[a-zA-Z](-?[a-zA-Z0-9])+$/;
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public passwordRegex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d\w\W]{8,}$/;
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public usernameRegex = /^[a-zA-Z0-9_\-.]{3,26}$/;
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/**
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* Merge array of objects into single object
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* @param flash Array of objects
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* @returns Merged object
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*/
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public mergeObjectArray(flash: Record<string, any>[]): Record<string, any> {
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return flash.reduce<Record<string, any>>(
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(obj, item) => ({ ...obj, ...item }),
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{},
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);
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}
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/**
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* Trim values of specified keys of an object
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* @param entry Object
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* @param fields Fields to strip spaces from
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* @returns Object with trimmed values
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*/
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public trimmed<T>(entry: T, fields: string[]): T {
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return fields.reduce<T>(
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(object, key) => ({ ...object, [key]: object[key]?.trim() }),
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entry,
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);
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}
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/**
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* Strip keys from an object
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* @param object Object to strip
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* @param keys Keys to strip from the object
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* @returns Stripped object
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*/
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public stripObject<T>(object: T, keys: string[]): T {
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return keys.reduce<T>((obj, field) => {
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delete obj[field];
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return obj;
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}, object);
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}
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/**
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* Pluck keys from an object
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* @param object Object to pluck
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* @param keys Keys to pluck from the object
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* @returns Plucked object
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*/
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public pluckObject<T>(object: T, keys: string[]): Partial<T> {
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return Object.keys(object).reduce<Partial<T>>((obj, field) => {
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if (keys.includes(field)) {
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obj[field] = object[field];
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}
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return obj;
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}, {});
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}
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/**
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* Strip keys from an object array
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* @param array Object array to strip
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* @param keys Keys to strip from the object array
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* @returns Stripped object
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*/
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public stripObjectArray<T>(array: T[], keys: string[]): T[] {
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return array.map((object) => this.stripObject(object, keys));
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}
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/**
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* Pluck keys from an object array
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* @param array Object array to pluck
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* @param keys Keys to pluck from the object array
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* @returns Plucked object
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*/
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public pluckObjectArray<T>(array: T[], keys: string[]): Partial<T>[] {
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return array.map((object) => this.pluckObject(object, keys));
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}
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/**
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* Include CSRF token, messages and prefilled form values for a template with a form
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* @param req Express request
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* @param additional Additional data to pass
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* @returns Template locals
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*/
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public populateTemplate(
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req: Request,
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additional: Record<string, any> = {},
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): Record<string, any> {
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const message = req.flash('message')[0] || {};
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const form = this.mergeObjectArray(
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(req.flash('form') as Record<string, any>[]) || [],
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);
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return {
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path: req.originalUrl,
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csrf: req.csrfToken(),
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message,
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form,
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...additional,
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};
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}
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}
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