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const {isInteger, isObject} = require('lodash')
const {getLogger} = require('./logger')
const typeNames = {
'i': 'integer',
'n': 'number',
's': 'string',
'o': 'object',
'a': 'array',
}
const logger = getLogger('data-validator')
/**
* @param {string} expectedType
* @param value
*/
function checkType(expectedType, value) {
switch (expectedType) {
case 'i':
return isInteger(value)
case 'n':
return typeof value === 'number'
case 's':
return typeof value === 'string'
case 'o':
return typeof value === 'object'
case 'a':
return Array.isArray(value)
default:
logger.error(`checkType: unknown type ${expectedType}`)
return false
}
}
/**
* @param {object} data
* @param {array} schema
* @throws Error
*/
function validateObjectSchema(data, schema) {
if (!isObject(data))
throw new Error(`data is not an object`)
for (const field of schema) {
let [name, types, required] = field
if (!(name in data)) {
if (required)
throw new Error(`missing required field ${name}`)
continue
}
types = types.split('')
if (!types
.map(type => checkType(type, data[name]))
.some(result => result === true)) {
let error = `'${name}' must be `
if (types.length === 1) {
error += typeNames[types[0]]
} else {
error += 'any of: ' + types.map(t => typeNames[t]).join(', ')
}
throw new Error(error)
}
}
}
function validateTargetsList(targets) {
if (!Array.isArray(targets))
throw new Error('targets must be array')
if (!targets.length)
throw new Error('targets are empty')
for (const t of targets) {
const type = typeof t
if (type !== 'string')
throw new Error(`all targets must be strings, ${type} given`)
}
}
module.exports = {
validateObjectSchema,
validateTargetsList
}
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