Ocelot-Social/backend/src/middleware/validation/index.js

import { UserInputError } from 'apollo-server'

const USERNAME_MIN_LENGTH = 3

const validateUsername = async (resolve, root, args, context, info) => {
  if (args.name && args.name.length >= USERNAME_MIN_LENGTH) {
    /* eslint-disable-next-line no-return-await */
    return await resolve(root, args, context, info)
  } else {
    throw new UserInputError(`Username must be at least ${USERNAME_MIN_LENGTH} characters long!`)
  }
}

const validateUrl = async (resolve, root, args, context, info) => {
  const { url } = args
  const isValid = url.match(/^(?:https?:\/\/)(?:[^@\n])?(?:www\.)?([^:/\n?]+)/g)
  if (isValid) {
    /* eslint-disable-next-line no-return-await */
    return await resolve(root, args, context, info)
  } else {
    throw new UserInputError('Input is not a URL')
  }
}

const validateComment = async (resolve, root, args, context, info) => {
  const COMMENT_MIN_LENGTH = 1
  const content = args.content.replace(/<(?:.|\n)*?>/gm, '').trim()
  if (!args.content || content.length < COMMENT_MIN_LENGTH) {
    throw new UserInputError(
      `Comment must be at least ${COMMENT_MIN_LENGTH} character long!`
    )
  }
  const NO_POST_ERR_MESSAGE = 'Comment cannot be created without a post!'
  const { postId } = args
  if (!postId) {
    throw new UserInputError(NO_POST_ERR_MESSAGE)
  }

  return await resolve(root, args, context, info)
}

export default {
  Mutation: {
    CreateUser: validateUsername,
    UpdateUser: validateUsername,
    CreateSocialMedia: validateUrl,
    CreateComment: validateComment,
    UpdateComment: validateComment
  }
}