Created
August 23, 2020 05:59
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class Validator { | |
constructor(data, rules) { | |
this.data = data | |
this.rules = rules | |
this.errors = {} | |
} | |
get validations() { | |
return { | |
required(field) { | |
if (!this.data[field]) { | |
return `The ${field} is required.` | |
} | |
}, | |
string(field) { | |
if (typeof this.data[field] !== 'string') { | |
return `The ${field} must be a string.` | |
} | |
}, | |
integer(field) { | |
if (!Number.isInteger(this.data[field])) { | |
return `The ${field} must be an integer.` | |
} | |
}, | |
maxlength(field, max) { | |
if (this.data[field].length > max) { | |
return `The ${field} may not be greater than ${max} characters.` | |
} | |
}, | |
minvalue(field, min) { | |
if (this.data[field] < min) { | |
return `The ${field} must be at least ${min}.` | |
} | |
} | |
} | |
} | |
async validate() { | |
for (const field in this.rules) { | |
const validations = this.rules[field].split('|') | |
for (const validation of validations) { | |
const splitted = validation.split(':') | |
const validationName = splitted[0] | |
const params = (splitted[1] && splitted[1].split(',')) || [] | |
const message = await this.validations[validationName].call(this, field, ...params) | |
if (message) { | |
this.errors[field] = message | |
break | |
} | |
} | |
} | |
if (Object.keys(this.errors).length > 0) { | |
throw this.errors | |
} | |
} | |
} | |
// Example | |
const data = { | |
name: 'Renan', | |
age: 24 | |
} | |
const rules = { | |
name: 'required|string|maxlength:10', | |
age: 'required|integer|minvalue:18' | |
} | |
const validator = new Validator(data, rules) | |
validator.validate() | |
.then(() => { | |
console.log('Passed') | |
}) | |
.catch(err => { | |
console.error(err) | |
}) |
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