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90 lines
2.4 KiB
90 lines
2.4 KiB
import ResponseFactory from './ResponseFactory.ts'
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import {Request} from '../Request.ts'
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import * as api from '../../support/api.ts'
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import {HTTPStatus} from '../../const/http.ts'
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/**
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* Response factory to render a handled request-level error.
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* @extends ResponseFactory
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*/
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export default class ErrorResponseFactory extends ResponseFactory {
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/**
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* The target output mode.
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* @type 'json' | 'html'
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*/
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protected target_mode: 'json' | 'html' = 'html'
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constructor(
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/**
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* The error to display.
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* @type Error
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*/
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public readonly error: Error,
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/**
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* THe HTTP status to use for the response.
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* @type HTTPStatus
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*/
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status: HTTPStatus = HTTPStatus.INTERNAL_SERVER_ERROR,
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/**
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* The output format.
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* @type 'json' | 'html'
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*/
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output: 'json' | 'html' = 'html',
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) {
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super()
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this.status(status)
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this.mode(output)
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}
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/**
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* Override the output mode.
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* @param {'json' | 'html'} output
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* @return ErrorResponseFactory
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*/
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public mode(output: 'json' | 'html'): ErrorResponseFactory {
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this.target_mode = output
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return this
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}
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/**
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* Write this response factory to the given request's response.
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* @param {Request} request
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* @return Request
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*/
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public async write(request: Request): Promise<Request> {
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request = await super.write(request)
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if ( this.target_mode === 'json' ) {
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request.response.headers.set('Content-Type', 'application/json')
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request.response.body = this.build_json(this.error)
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} else if ( this.target_mode === 'html' ) {
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request.response.headers.set('Content-Type', 'text/html')
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request.response.body = this.build_html(this.error)
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}
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return request
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}
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/**
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* Build the HTML display for the given error.
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* @param {Error} error
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* @return string
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*/
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protected build_html(error: Error) {
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return `
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<b>Sorry, an unexpected error occurred while processing your request.</b>
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<br>
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<pre><code>
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Name: ${error.name}
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Message: ${error.message}
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Stack trace:
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- ${error.stack ? error.stack.split(/\s+at\s+/).slice(1).join('<br> - ') : 'none'}
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</code></pre>
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`
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}
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protected build_json(error: Error) {
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return JSON.stringify(api.error(error))
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}
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}
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