joi

joi-extended.js

const Joi = require('joi');

module.exports = Joi.extend([
  {
    base: Joi.string(),
    name: 'string',
    language: {
      objectid: 'needs to be a valid object id',
      sha: 'needs to be a valid sha string'
    },
    rules: [
      {
        name: 'objectid',
        description: 'Determine if the id is a valid mongo object id.',
        validate(params, value, state, options) {

          if (!_.isObjectId(value)) {
            return this.createError('string.objectid', { v: value }, state, options);
          }

          return value;
        }
      },
      {
        name: 'sha',
        description: 'Determine if the id is a valid sha string.',
        validate(params, value, state, options) {

          if (!_.isSha(value)) {
            return this.createError('string.sha', { v: value }, state, options);
          }

          return value;
        }
      }
    ]
  },
  {
    base: Joi.any(),
    name: 'any',
    language: {
      image: 'needs to be an image with .gif .png, .jpg, .jpeg extension.',
      isJS: 'needs to be javascript file with a .js extension.',
      isJSON: 'needs to be json file with a .json extension.'
    },
    rules: [
      {
        name: 'image',
        validate(params, value, state, options) {

          const mimeType = value.hapi.headers['content-type'];
          const regex = /(jpeg|png|gif|jpg)/i;

          if (!regex.test(mimeType)) {
            return this.createError('any.image', { v: value }, state, options);
          }

          return value;
        }
      },
      {
        name: 'isJS',
        validate(params, value, state, options) {

          const mimeType = value.hapi.headers['content-type'];

          if (mimeType !== 'application/javascript') {
            return this.createError('any.isJS', { v: value }, state, options);
          }

          return value;
        }
      },
      {
        name: 'isJSON',
        validate(params, value, state, options) {

          const mimeType = value.hapi.headers['content-type'];

          if (mimeType !== 'application/json') {
            return this.createError('any.isJSON', { v: value }, state, options);
          }

          return value;
        }
      }
    ]
  }
]);