backend/app/routing/middleware/api/RequiredFields.middleware.js

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const Middleware = require('libflitter/middleware/Middleware')
/*
* RequiredFields Middleware
* -------------------------------------------------------------
* Put some description here!
*/
class RequiredFields extends Middleware {
static get services() {
return [...super.services, 'configs', 'output', 'utility']
}
/*
* Run the middleware test.
* This method is required by all Flitter middleware.
* It should either call the next function in the stack,
* or it should handle the response accordingly.
*/
async test(req, res, next, args){
// Do stuff here
const search_fields = args.search ? (Array.isArray(args.search) ? args.search : [args.search]) : ['params', 'body', 'query']
const form_config = this.configs.get('api:forms:'+args.form)
const values = {}
for ( const field in form_config.fields ) {
if ( !form_config.fields.hasOwnProperty(field) ) continue
const field_config = form_config.fields[field]
let field_value = this.get_field({ request: req, field, search_fields })
if ( !field_value ) {
if ( field_config.required ) {
return this.fail({ response: res, reason: `Missing required field: ${field}`})
}
} else {
if ( field_config.infer !== false ) {
field_value = this.utility.infer(field_value)
}
if ( field_config.coerce ) {
field_value = field_config.coerce(field_value)
if ( field_config.coerce === Number && isNaN(field_value) ) {
return this.fail({ response: res, reason: 'Invalid numerical value for field: '+field })
}
}
if ( field_config.in_set ) {
if ( Array.isArray(field_config.in_set) ) {
if ( !field_config.in_set.includes(field_value) ) {
return this.fail({ response: res, reason: `Invalid value for ${field}. Value must be one of: ${field_config.join(', ')}`})
}
} else {
this.output.warn(`[Middleware RequiredFields] Invalid in_set for ${field} in ${args.form}. Must be array.`)
}
}
values[field] = field_value
}
}
req.form = values
/*
* Call the next function in the stack.
*/
next()
}
get_field({ request, field, search_fields }) {
for ( const search_field of search_fields ) {
if ( Object.keys(request).includes(search_field) ) {
if ( Object.keys(request[search_field]).includes(field) ) {
return request[search_field][field]
}
} else {
this.output.warn(`[Middleware RequiredFields] Requested search of request field that does not exist: ${search_field}`)
this.output.debug(`[Middleware RequiredFields] Available request keys: ${Object.keys(request).join(', ')}`)
}
}
}
fail({ response, reason }) {
return response.status(400).message(reason).api({})
}
}
module.exports = exports = RequiredFields