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Validate input parameters in node.js requests
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var _ = require('underscore') | |
var util = require('util') | |
function validate(request) { | |
var errors = [] | |
var values = {} | |
var obj = {} | |
function validator(param) { | |
var vals = request[param] | |
var self = {} | |
self.string = function(field, required) { | |
var value = vals[field] | |
if ((_.isUndefined(value) && required) || !_.isString(value)) { | |
errors.push({ field: field, message: util.format('`%s` is a required string field', field) }) | |
} else { | |
values[field] = value | |
} | |
return obj | |
} | |
self.stringArray = function(field, required) { | |
var value = vals[field] | |
if ((_.isUndefined(value) && required) || !_.isArray(value)) { | |
errors.push({ field: field, message: util.format('`%s` is a required array of strings', field) }) | |
return obj | |
} | |
if (!_.find(value, function(val) { | |
if (!_.isString(val)) { | |
errors.push({ field: field, message: util.format('`%s` must be an array of strings', field) }) | |
return true | |
} | |
})) { | |
values[field] = value | |
} | |
return obj | |
} | |
self.number = function(field, required, min, max) { | |
var value = vals[field] | |
if (value != +value) { | |
errors.push({ field: field, message: util.format('`%s` must be a number', field) }) | |
return obj | |
} | |
if (_.isUndefined(value) && required) { | |
errors.push({ field: field, message: util.format('`%s` is a required number', field) }) | |
return obj | |
} | |
value = +value | |
if (!_.isUndefined(min) && value < min) { | |
errors.push({ field: field, message: util.format('`%s` must be higher than %d', field, min) }) | |
} else if (!_.isUndefined(max) && value > max) { | |
errors.push({ field: field, message: util.format('`%s` must be lower than %d', field, max) }) | |
} else { | |
values[field] = +value | |
} | |
return obj | |
} | |
self.integer = function(field, required, min, max) { | |
var value = vals[field] | |
if (value != Math.floor(+value)) { | |
errors.push({ field: field, message: util.format('`%s` must be an integer', field) }) | |
return obj | |
} | |
if (_.isUndefined(value) && required) { | |
errors.push({ field: field, message: util.format('`%s` is a required integer', field) }) | |
return obj | |
} | |
value = Math.floor(+value) | |
if (!_.isUndefined(min) && value < min) { | |
errors.push({ field: field, message: util.format('`%s` must be higher or equal than %d', field, min) }) | |
} else if (!_.isUndefined(max) && value > max) { | |
errors.push({ field: field, message: util.format('`%s` must be lower or equal than %d', field, max) }) | |
} else { | |
values[field] = +value | |
} | |
return obj | |
} | |
self.object = function(field, required) { | |
var value = vals[field] | |
if (!_.isObject(value)) { | |
if (required) { | |
errors.push({ field: field, message: util.format('`%s` is a required string field', field) }) | |
return obj | |
} | |
} else { | |
values[field] = value | |
} | |
return obj | |
} | |
return self | |
} | |
;['body', 'query', 'params'].forEach(function(key) { | |
obj[key] = validator(key) | |
}) | |
obj.end = function(callback) { | |
callback(errors.length > 0 ? _.groupBy(errors, function(err) { | |
var field = err.field | |
delete err.field | |
return field | |
}) : null, values) | |
} | |
return obj | |
} | |
// example | |
validate(req) | |
.body.string('some-string-param', true) | |
.body.stringArray('some-array-param', true) | |
.body.number('a-number-param', true) | |
.body.integer('an-integer-param', true, 0, 100) | |
.end(function(errors, values) { | |
// errors: validation errors if any | |
// values: object with accepted values | |
console.log('errors', errors, values) | |
}) |
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