Function ValidationErrorHandler

Add a method of a controller as a validation error handler.

Example

import { Controller, ControllerBase, IHttpRequest, IHttpResponse, JoiValidationError, POST, schema, ValidationErrorHandler } from '@egomobile/http-server'

const mySchema = schema.object({
  email: schema.string().trim().email().required(),
  name: schema.string().trim().min(1).optional()
})

@Controller()
export default class MyController extends ControllerBase {
  @POST(mySchema)
  async index(request: IHttpRequest, response: IHttpResponse) {
    response.write('You send: ' + JSON.stringify(response.body!))
  }

  @ValidationErrorHandler()  // mark that method as default schema validation
                             // error handler inside that controller
  async handleValidationError(error: JoiValidationError, request: IHttpRequest, response: IHttpResponse) {
    const errorMessage = Buffer.from('VALIDATION ERROR: ' + error.message, 'utf8')

    response.writeHead(400, {
      'Content-Length': String(errorMessage.length)
    })
    response.write(errorMessage)

    response.end()
  }
}
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