1	<!DOCTYPE html>
2	<html lang="es">
3
4	<head>
5
6	<meta charset="UTF-8">
7	<meta name="viewport" content="width=device-width">
8
9	<title>Uso de tokens</title>
10
11	<script type="module" src="libclienteweb/manejaErrores.js"></script>
12
13	</head>
14
15	<body>
16
17	<h1>Uso de tokens</h1>
18
19	<p>
20	<a href="formulario.html">Servicio que procesa un formulario con token.</a>
21	</p>
22
23	</form>
24
25	</body>
26
27	</html>

1	<!DOCTYPE html>
2	<html lang="es">
3
4	<head>
5
6	<meta charset="UTF-8">
7	<meta name="viewport" content="width=device-width">
8
9	<title>Servicio que procesa un formulario con token</title>
10
11	<script src="dompurify/purify.min.js"></script>
12	<script type="module" src="libclienteweb/manejaErrores.js"></script>
13
14	</head>
15
16	<body>
17
18	<form id="formulario">
19
20	<h1>Servicio que procesa un formulario con token</h1>
21
22	<p><a href="index.html">Cancela</a></p>
23
24	<!-- Al enviar la forma, se envía el token recibido. -->
25	<input type="hidden" name="x">
26
27	<p>
28	<label>
29	Saludo:
30	<input name="saludo">
31	</label>
32	</p>
33
34	<p>
35	<label>
36	Nombre:
37	<input name="nombre">
38	</label>
39	</p>
40
41	<p>
42	<button type="reset">Restaurar</button>
43	<button type="submit">Procesa</button>
44	</p>
45
46	</form>
47
48	<script type="module">
49
50	import { consume } from "./libclienteweb/consume.js"
51	import { descargaVista } from "./libclienteweb/descargaVista.js"
52	import { submitFormRecibeJson } from "./libclienteweb/submitFormRecibeJson.js"
53
54	descargaDatos()
55
56	async function descargaDatos() {
57
58	// Al cargar, registra este formulario en la sesión y recibe un token.
59	await descargaVista("api/vista-formulario.php")
60
61	formulario.addEventListener("submit", procesa)
62
63	async function procesa(event) {
64	event.preventDefault()
65	const resultado =
66	await consume(submitFormRecibeJson("api/procesa.php", formulario))
67	const mensaje = await resultado.json()
68	alert(mensaje)
69	location.href = "index.html"
70	}
71
72	}
73
74	</script>
75
76	</body>
77
78	</html>

I. Carpeta « libclienteweb »

A. libclienteweb / consume.js

import { ProblemDetailsError } from "./ProblemDetailsError.js"

/**
 * Espera a que la promesa de un fetch termine. Si
 * hay error, lanza una excepción.
 * 
 * @param {Promise<Response> } servicio
 */
export async function consume(servicio) {
 const respuesta = await servicio
 if (respuesta.ok) {
  return respuesta
 } else {
  const contentType = respuesta.headers.get("Content-Type")
  if (
   contentType !== null && contentType.startsWith("application/problem+json")
  )
   throw new ProblemDetailsError(await respuesta.json())
  else
   throw new Error(respuesta.statusText)
 }
}

1	import { ProblemDetailsError } from "./ProblemDetailsError.js"
2
3	/**
4	* Espera a que la promesa de un fetch termine. Si
5	* hay error, lanza una excepción.
6	*
7	* @param {Promise<Response> } servicio
8	*/
9	export async function consume(servicio) {
10	const respuesta = await servicio
11	if (respuesta.ok) {
12	return respuesta
13	} else {
14	const contentType = respuesta.headers.get("Content-Type")
15	if (
16	contentType !== null && contentType.startsWith("application/problem+json")
17	)
18	throw new ProblemDetailsError(await respuesta.json())
19	else
20	throw new Error(respuesta.statusText)
21	}
22	}

B. libclienteweb / descargaVista.js

import { consume } from "./consume.js"
import { muestraObjeto } from "./muestraObjeto.js"
import { recibeJson } from "./recibeJson.js"

/**
 * @param {string} url
 * @param { "GET" | "POST"| "PUT" | "PATCH" | "DELETE" | "TRACE" | "OPTIONS"
 *  | "CONNECT" | "HEAD" } metodoHttp
 */
export async function descargaVista(url, metodoHttp = "GET") {
 const respuesta = await consume(recibeJson(url, metodoHttp))
 const json = await respuesta.json()
 muestraObjeto(document, json)
 return json
}

1	import { consume } from "./consume.js"
2	import { muestraObjeto } from "./muestraObjeto.js"
3	import { recibeJson } from "./recibeJson.js"
4
5	/**
6	* @param {string} url
7	* @param { "GET" \| "POST"\| "PUT" \| "PATCH" \| "DELETE" \| "TRACE" \| "OPTIONS"
8	* \| "CONNECT" \| "HEAD" } metodoHttp
9	*/
10	export async function descargaVista(url, metodoHttp = "GET") {
11	const respuesta = await consume(recibeJson(url, metodoHttp))
12	const json = await respuesta.json()
13	muestraObjeto(document, json)
14	return json
15	}

C. libclienteweb / manejaErrores.js

import { muestraError } from "./muestraError.js"

/**
 * Intercepta Response.prototype.json para capturar errores de parseo
 * y asegurar que se reporten correctamente en navegadores Chromium.
 */
{
 const originalJson = Response.prototype.json

 Response.prototype.json = function () {
  // Llamamos al método original usando el contexto (this) de la respuesta
  return originalJson.call(this)
   .catch((/** @type {any} */ error) => {
    // Corrige un error de Chrome que evita el manejo correcto de errores.
    throw new Error(error)
   })
 }
}

window.onerror = function (
 /** @type {Event | string} */ _event,
 /** @type {string | undefined} */ _fuente,
 /** @type {number | undefined} */ _numeroDeLinea,
 /** @type {number | undefined} */ _numeroDeColumna,
 /** @type {Error | undefined} */ error
) {
 muestraError(error)
 return true
}

window.addEventListener('unhandledrejection', event => {
 muestraError(event.reason)
 event.preventDefault()
})

1	import { muestraError } from "./muestraError.js"
2
3	/**
4	* Intercepta Response.prototype.json para capturar errores de parseo
5	* y asegurar que se reporten correctamente en navegadores Chromium.
6	*/
7	{
8	const originalJson = Response.prototype.json
9
10	Response.prototype.json = function () {
11	// Llamamos al método original usando el contexto (this) de la respuesta
12	return originalJson.call(this)
13	.catch((/** @type {any} */ error) => {
14	// Corrige un error de Chrome que evita el manejo correcto de errores.
15	throw new Error(error)
16	})
17	}
18	}
19
20	window.onerror = function (
21	/** @type {Event \| string} */ _event,
22	/** @type {string \| undefined} */ _fuente,
23	/** @type {number \| undefined} */ _numeroDeLinea,
24	/** @type {number \| undefined} */ _numeroDeColumna,
25	/** @type {Error \| undefined} */ error
26	) {
27	muestraError(error)
28	return true
29	}
30
31	window.addEventListener('unhandledrejection', event => {
32	muestraError(event.reason)
33	event.preventDefault()
34	})

D. libclienteweb / muestraError.js

import { ProblemDetailsError } from "./ProblemDetailsError.js"

/**
 * Muestra los datos de una Error en la consola y en un cuadro de alerta.
 * @param { unknown } error descripción del error.
 */
export function muestraError(error) {

 if (error instanceof ProblemDetailsError) {

  const problemDetails = error.problemDetails

  let mensaje =
   typeof problemDetails["title"] === "string" ? problemDetails["title"] : ""
  if (typeof problemDetails["detail"] === "string") {
   if (mensaje !== "") {
    mensaje += "\n"
   }
   mensaje += problemDetails["detail"]
  }
  if (mensaje === "") {
   mensaje = "Error"
  }
  console.error(error, problemDetails)
  alert(mensaje)

 } else if (
  typeof error === "object" && error !== null && "message" in error
 ) {

  console.error(error)
  alert(error.message)

 } else {

  console.error("Error", error)
  alert("Error")

 }

}

1	import { ProblemDetailsError } from "./ProblemDetailsError.js"
2
3	/**
4	* Muestra los datos de una Error en la consola y en un cuadro de alerta.
5	* @param { unknown } error descripción del error.
6	*/
7	export function muestraError(error) {
8
9	if (error instanceof ProblemDetailsError) {
10
11	const problemDetails = error.problemDetails
12
13	let mensaje =
14	typeof problemDetails["title"] === "string" ? problemDetails["title"] : ""
15	if (typeof problemDetails["detail"] === "string") {
16	if (mensaje !== "") {
17	mensaje += "\n"
18	}
19	mensaje += problemDetails["detail"]
20	}
21	if (mensaje === "") {
22	mensaje = "Error"
23	}
24	console.error(error, problemDetails)
25	alert(mensaje)
26
27	} else if (
28	typeof error === "object" && error !== null && "message" in error
29	) {
30
31	console.error(error)
32	alert(error.message)
33
34	} else {
35
36	console.error("Error", error)
37	alert("Error")
38
39	}
40
41	}

E. libclienteweb / muestraObjeto.js

/**
 * @param {Document | HTMLElement | ShadowRoot} raizHtml
 * @param { any } objeto
 */
export function muestraObjeto(raizHtml, objeto) {
 for (const [nombre, definiciones] of Object.entries(objeto)) {
  if (Array.isArray(definiciones)) {
   muestraArray(raizHtml, nombre, definiciones)
  } else if (definiciones !== undefined && definiciones !== null) {
   muestraElementos(raizHtml, nombre, definiciones)
  }
 }
}

/**
 * @param { string } nombre
 */
export function selectorDeNombre(nombre) {
 return `[id="${ nombre }"],[name="${ nombre }"],[data-name="${ nombre }"]`
}

/**
 * @param { Document | HTMLElement | ShadowRoot } raizHtml
 * @param { string } propiedad
 * @param {any[]} valores
 */
function muestraArray(raizHtml, propiedad, valores) {
 const conjunto = new Set(valores)
 const elementos = raizHtml.querySelectorAll(selectorDeNombre(propiedad))
 if (elementos.length === 1 && elementos[0] instanceof HTMLSelectElement) {
  muestraOptions(elementos[0], conjunto)
 } else {
  muestraInputs(elementos, conjunto)
 }

}

/**
 * @param {HTMLSelectElement} select
 * @param {Set<any>} conjunto
 */
function muestraOptions(select, conjunto) {
 for (let i = 0, options = select.options, len = options.length; i < len; i++) {
  const option = options[i]
  option.selected = conjunto.has(option.value)
 }
}

/**
 * @param {NodeListOf<Element>} elementos
 * @param {Set<any>} conjunto
 */
function muestraInputs(elementos, conjunto) {
 for (let i = 0, len = elementos.length; i < len; i++) {
  const elemento = elementos[i]
  if (elemento instanceof HTMLInputElement) {
   elemento.checked = conjunto.has(elemento.value)
  }
 }
}

const data_ = "data-"
const data_Length = data_.length

/**
 * @param {Document | HTMLElement | ShadowRoot} raizHtml
 * @param {string} nombre
 * @param {{ [s: string]: any; } } definiciones
 */
function muestraElementos(raizHtml, nombre, definiciones) {
 const elementos = raizHtml.querySelectorAll(selectorDeNombre(nombre))
 for (let i = 0, len = elementos.length; i < len; i++) {
  /**
   * @type {any}
   */
  const elemento = elementos[i]
  if (elemento !== null) {
   for (const [propiedad, valor] of Object.entries(definiciones)) {
    if (propiedad in elemento) {
     if (propiedad === "innerHTML") {
      // @ts-ignore
      elemento["innerHTML"] = DOMPurify.sanitize(valor)
     } else {
      elemento[propiedad] = valor
     }
    } else if (
     propiedad.length > data_Length
     && propiedad.startsWith(data_)
     && elemento instanceof HTMLElement
    ) {
     elemento.dataset[propiedad.substring(data_Length)] = valor
    }
   }
  }
 }
}

1	/**
2	* @param {Document \| HTMLElement \| ShadowRoot} raizHtml
3	* @param { any } objeto
4	*/
5	export function muestraObjeto(raizHtml, objeto) {
6	for (const [nombre, definiciones] of Object.entries(objeto)) {
7	if (Array.isArray(definiciones)) {
8	muestraArray(raizHtml, nombre, definiciones)
9	} else if (definiciones !== undefined && definiciones !== null) {
10	muestraElementos(raizHtml, nombre, definiciones)
11	}
12	}
13	}
14
15	/**
16	* @param { string } nombre
17	*/
18	export function selectorDeNombre(nombre) {
19	return `[id="${ nombre }"],[name="${ nombre }"],[data-name="${ nombre }"]`
20	}
21
22	/**
23	* @param { Document \| HTMLElement \| ShadowRoot } raizHtml
24	* @param { string } propiedad
25	* @param {any[]} valores
26	*/
27	function muestraArray(raizHtml, propiedad, valores) {
28	const conjunto = new Set(valores)
29	const elementos = raizHtml.querySelectorAll(selectorDeNombre(propiedad))
30	if (elementos.length === 1 && elementos[0] instanceof HTMLSelectElement) {
31	muestraOptions(elementos[0], conjunto)
32	} else {
33	muestraInputs(elementos, conjunto)
34	}
35
36	}
37
38	/**
39	* @param {HTMLSelectElement} select
40	* @param {Set<any>} conjunto
41	*/
42	function muestraOptions(select, conjunto) {
43	for (let i = 0, options = select.options, len = options.length; i < len; i++) {
44	const option = options[i]
45	option.selected = conjunto.has(option.value)
46	}
47	}
48
49	/**
50	* @param {NodeListOf<Element>} elementos
51	* @param {Set<any>} conjunto
52	*/
53	function muestraInputs(elementos, conjunto) {
54	for (let i = 0, len = elementos.length; i < len; i++) {
55	const elemento = elementos[i]
56	if (elemento instanceof HTMLInputElement) {
57	elemento.checked = conjunto.has(elemento.value)
58	}
59	}
60	}
61
62	const data_ = "data-"
63	const data_Length = data_.length
64
65	/**
66	* @param {Document \| HTMLElement \| ShadowRoot} raizHtml
67	* @param {string} nombre
68	* @param {{ [s: string]: any; } } definiciones
69	*/
70	function muestraElementos(raizHtml, nombre, definiciones) {
71	const elementos = raizHtml.querySelectorAll(selectorDeNombre(nombre))
72	for (let i = 0, len = elementos.length; i < len; i++) {
73	/**
74	* @type {any}
75	*/
76	const elemento = elementos[i]
77	if (elemento !== null) {
78	for (const [propiedad, valor] of Object.entries(definiciones)) {
79	if (propiedad in elemento) {
80	if (propiedad === "innerHTML") {
81	// @ts-ignore
82	elemento["innerHTML"] = DOMPurify.sanitize(valor)
83	} else {
84	elemento[propiedad] = valor
85	}
86	} else if (
87	propiedad.length > data_Length
88	&& propiedad.startsWith(data_)
89	&& elemento instanceof HTMLElement
90	) {
91	elemento.dataset[propiedad.substring(data_Length)] = valor
92	}
93	}
94	}
95	}
96	}

F. libclienteweb / ProblemDetailsError.js

export class ProblemDetailsError extends Error {

 /**
  * Detalle de los errores devueltos por un servicio.
  * Crea una instancia de ProblemDetailsError.
  * @param {any} problemDetails Objeto con la descripcipon del error.
  */
 constructor(problemDetails) {

  super(
   typeof problemDetails["detail"] === "string"
    ? problemDetails["detail"]
    : (
     typeof problemDetails["title"] === "string"
      ? problemDetails["title"]
      : "Error"
    )
  )

  this.problemDetails = problemDetails

 }

}

1	export class ProblemDetailsError extends Error {
2
3	/**
4	* Detalle de los errores devueltos por un servicio.
5	* Crea una instancia de ProblemDetailsError.
6	* @param {any} problemDetails Objeto con la descripcipon del error.
7	*/
8	constructor(problemDetails) {
9
10	super(
11	typeof problemDetails["detail"] === "string"
12	? problemDetails["detail"]
13	: (
14	typeof problemDetails["title"] === "string"
15	? problemDetails["title"]
16	: "Error"
17	)
18	)
19
20	this.problemDetails = problemDetails
21
22	}
23
24	}

G. libclienteweb / recibeJson.js


/**
 * @param {string} url
 * @param { "GET" | "POST"| "PUT" | "PATCH" | "DELETE" | "TRACE" | "OPTIONS"
 *  | "CONNECT" | "HEAD" } metodoHttp
 */
export async function recibeJson(url, metodoHttp = "GET") {
 return fetch(
  url,
  {
   method: metodoHttp,
   headers: { "Accept": "application/json, application/problem+json" }
  }
 )
}

1
2	/**
3	* @param {string} url
4	* @param { "GET" \| "POST"\| "PUT" \| "PATCH" \| "DELETE" \| "TRACE" \| "OPTIONS"
5	* \| "CONNECT" \| "HEAD" } metodoHttp
6	*/
7	export async function recibeJson(url, metodoHttp = "GET") {
8	return fetch(
9	url,
10	{
11	method: metodoHttp,
12	headers: { "Accept": "application/json, application/problem+json" }
13	}
14	)
15	}

H. libclienteweb / submitFormRecibeJson.js

/**
 * Envía los datos de un formolario a la url usando la codificación
 * multipart/form-data.
 * @param {string} url
 * @param {HTMLFormElement | FormData} formulario
 * @param { "GET" | "POST"| "PUT" | "PATCH" | "DELETE" | "TRACE" | "OPTIONS"
 *  | "CONNECT" | "HEAD" } metodoHttp
 */
export function submitFormRecibeJson(url, formulario, metodoHttp = "POST") {

 const formData =
  formulario instanceof FormData ? formulario : new FormData(formulario)

 if (tieneArchivos(formData)) {

  return fetch(
   url,
   {
    method: metodoHttp,
    headers: { "Accept": "application/json, application/problem+json" },
    body: formData
   }
  )

 } else {

  // @ts-ignore
  const params = new URLSearchParams(formData)
  const queryString = params.toString()

  return fetch(
   url,
   {
    method: metodoHttp,
    headers: {
     'Content-Type': 'application/x-www-form-urlencoded',
     "Accept": "application/json, application/problem+json"
    },
    body: queryString
   }
  )

 }

}

/**
 * @param {FormData} formData
 */
function tieneArchivos(formData) {
 for (const value of formData.values()) {
  if (value instanceof File) {
   return true
  }
 }
 return false
}

1	/**
2	* Envía los datos de un formolario a la url usando la codificación
3	* multipart/form-data.
4	* @param {string} url
5	* @param {HTMLFormElement \| FormData} formulario
6	* @param { "GET" \| "POST"\| "PUT" \| "PATCH" \| "DELETE" \| "TRACE" \| "OPTIONS"
7	* \| "CONNECT" \| "HEAD" } metodoHttp
8	*/
9	export function submitFormRecibeJson(url, formulario, metodoHttp = "POST") {
10
11	const formData =
12	formulario instanceof FormData ? formulario : new FormData(formulario)
13
14	if (tieneArchivos(formData)) {
15
16	return fetch(
17	url,
18	{
19	method: metodoHttp,
20	headers: { "Accept": "application/json, application/problem+json" },
21	body: formData
22	}
23	)
24
25	} else {
26
27	// @ts-ignore
28	const params = new URLSearchParams(formData)
29	const queryString = params.toString()
30
31	return fetch(
32	url,
33	{
34	method: metodoHttp,
35	headers: {
36	'Content-Type': 'application/x-www-form-urlencoded',
37	"Accept": "application/json, application/problem+json"
38	},
39	body: queryString
40	}
41	)
42
43	}
44
45	}
46
47	/**
48	* @param {FormData} formData
49	*/
50	function tieneArchivos(formData) {
51	for (const value of formData.values()) {
52	if (value instanceof File) {
53	return true
54	}
55	}
56	return false
57	}

J. Carpeta « libservidorphp »

Versión para imprimir.

A. libservidorphp / BAD_REQUEST.php


1	<?php
2
3	const BAD_REQUEST = 400;
4

B. libservidorphp / creaToken.php

<?php

require_once __DIR__ . "/FORBIDDEN.php";
require_once __DIR__ . "/INTERNAL_SERVER_ERROR.php";
require_once __DIR__ . "/ProblemDetailsException.php";

function creaToken(string $pagina, int $duracionEnMinutos)
{
 $criptografiaFuerte = true;

 // Crea el token
 $token = [
  "expiracion" => time() + 60 * $duracionEnMinutos,
  // El token es de 80 caracteres, criptográficamente fuerte.
  "texto" => bin2hex(openssl_random_pseudo_bytes(80, $criptografiaFuerte))
 ];

 // Verifica que ya haya tokens $pagina.
 if (isset($_SESSION[$pagina])) {

  $tokensParaPagina = $_SESSION[$pagina];

  if (!is_array($tokensParaPagina))
   throw new ProblemDetailsException([
    "status" => INTERNAL_SERVER_ERROR,
    " title" => "No hay arreglo de tokens.",
    "type" => "/error/sintokens.html",
   ]);

  // Como ya existe el arreglo, elimina los tokens expirados para esta pagina.
  $time = time();
  foreach ($tokensParaPagina as $llave => $tokenParaPagina) {
   if ($tokenParaPagina["expiracion"] > $time) {
    unset($tokensParaPagina[$llave]);
   }
  }

  // Se puede usar uno o varios tokens por pagina.
  $tokensParaPagina[] = $token;
  $_SESSION[$pagina] = $tokensParaPagina;
 } else {

  // Se puede usar uno o varios tokens por pagina 
  $_SESSION[$pagina] = [$token];
 }

 return $token["texto"];
}


C. libservidorphp / devuelveJson.php

<?php

require_once __DIR__ . "/devuelveResultadoNoJson.php";

function devuelveJson($resultado)
{
 $json = json_encode($resultado);
 if ($json === false) {
  devuelveResultadoNoJson();
 } else {
  header("Content-Type: application/json; charset=utf-8");
  echo $json;
 }
 exit();
}


D. libservidorphp / devuelveResultadoNoJson.php

<?php

require_once __DIR__ . "/INTERNAL_SERVER_ERROR.php";

function devuelveResultadoNoJson()
{
 http_response_code(INTERNAL_SERVER_ERROR);
 header("Content-Type: application/problem+json; charset=utf-8");

 echo '{' .
  "status: " . INTERNAL_SERVER_ERROR .
  '"title": "El resultado no puede representarse como JSON."' .
  '"type": "/errors/resultadonojson.html"' .
  '}';
}


E. libservidorphp / FORBIDDEN.php


1	<?php
2
3	const FORBIDDEN = 403;
4

F. libservidorphp / INTERNAL_SERVER_ERROR.php


1	<?php
2
3	const INTERNAL_SERVER_ERROR = 500;

G. libservidorphp / manejaErrores.php

<?php

require_once __DIR__ . "/INTERNAL_SERVER_ERROR.php";
require_once __DIR__ . "/ProblemDetailsException.php";

// Hace que se lance una excepción automáticamente cuando se genere un error.
set_error_handler(function ($severity, $message, $file, $line) {
 throw new ErrorException($message, 0, $severity, $file, $line);
});

// Código cuando una excepción no es atrapada.
set_exception_handler(function (Throwable $excepcion) {
 if ($excepcion instanceof ProblemDetailsException) {
  devuelveProblemDetails($excepcion->problemDetails);
 } else {
  devuelveProblemDetails([
   "status" => INTERNAL_SERVER_ERROR,
   "title" => "Error interno del servidor",
   "detail" => $excepcion->getMessage(),
   "type" => "/errors/errorinterno.html",
  ]);
 }
 exit();
});

function devuelveProblemDetails(array $array)
{
 $json = json_encode($array);
 if ($json === false) {
  devuelveResultadoNoJson();
 } else {
  http_response_code(isset($array["status"]) ? $array["status"] : 500);
  header("Content-Type: application/problem+json; charset=utf-8");
  echo $json;
 }
}


H. libservidorphp / ProblemDetailsException.php

<?php

require_once __DIR__ . "/INTERNAL_SERVER_ERROR.php";

/**
 * Detalle de los errores devueltos por un servicio.
 */
class ProblemDetailsException extends Exception
{

 public array $problemDetails;

 public function __construct(
  array $problemDetails,
 ) {
  
  parent::__construct(
   isset($problemDetails["detail"])
    ? $problemDetails["detail"]
    : (isset($problemDetails["title"])
     ? $problemDetails["title"]
     : "Error"),
   $problemDetails["status"]
    ? $problemDetails["status"]
    : INTERNAL_SERVER_ERROR
  );

  $this->problemDetails = $problemDetails;
 }
}


I. libservidorphp / recibeTexto.php

<?php

/**
 * Devuelve el texto de un parámetro enviado al
 * servidor por medio de GET, POST o cookie.
 * 
 * Si el parámetro no se recibe, devuelve false.
 */
function recibeTexto(string $parametro): false|string
{
 /* Si el parámetro está asignado en $_REQUEST,
  * devuelve su valor; de lo contrario, devuelve false.
  */
 $valor = isset($_REQUEST[$parametro])
  ? $_REQUEST[$parametro]
  : false;
 return $valor;
}


J. libservidorphp / recibeTextoObligatorio.php

<?php

require_once __DIR__ . "/BAD_REQUEST.php";
require_once __DIR__ . "/recibeTexto.php";
require_once __DIR__ . "/ProblemDetailsException.php";

function recibeTextoObligatorio(string $parametro)
{
 $texto = recibeTexto($parametro);

 if ($texto === false)
  throw new ProblemDetailsException([
   "status" => BAD_REQUEST,
   "title" => "Falta el valor $parametro.",
   "type" => "/errors/faltavalor.html",
   "detail" => "La solicitud no tiene el valor de $parametro."
  ]);

 $trimTexto = trim($texto);

 if ($trimTexto === "")
  throw new ProblemDetailsException([
   "status" => BAD_REQUEST,
   "title" => "Campo $parametro en blanco.",
   "type" => "/errors/campoenblanco.html",
   "detail" => "Pon texto en el campo $parametro."
  ]);

 return $trimTexto;
}


K. libservidorphp / validaToken.php

<?php

require_once __DIR__ . "/FORBIDDEN.php";
require_once __DIR__ . "/INTERNAL_SERVER_ERROR.php";
require_once __DIR__ . "/ProblemDetailsException.php";

function validaToken(string $pagina, string $token)
{
 if (!isset($_SESSION[$pagina]))
  throw new ProblemDetailsException([
   "status" => FORBIDDEN,
   "title" => "Página no registrada.",
   "type" => "/error/paginanoregistrada.html",
  ]);

 $tokensParaPagina = $_SESSION[$pagina];

 if (!is_array($tokensParaPagina))
  throw new ProblemDetailsException([
   "status" => INTERNAL_SERVER_ERROR,
   " title" => "No hay arreglo de tokens.",
   "type" => "/error/sintokens.html",
  ]);

 $hallado = false;

 // Valida que el token se haya registrado.
  $time = time();
 foreach ($tokensParaPagina as $llave => $tokenParaPagina) {

  if (strcmp($token, $tokenParaPagina["texto"]) === 0) {

   if ($tokenParaPagina["expiracion"] < $time) {
    unset($tokensParaPagina[$llave]);
    $_SESSION[$pagina] = $tokensParaPagina;
    throw new ProblemDetailsException([
     "status" => FORBIDDEN,
     "title" => "Tiempo de expiración excedido.",
     "type" => "/error/paginaexpirada.html",
    ]);
   }

   $hallado = true;
  } elseif ($tokenParaPagina["expiracion"] > $time) {

   // Elimina tokens expirados
   unset($tokensParaPagina[$llave]);
  }
 }

 $_SESSION[$pagina] = $tokensParaPagina;

 if ($hallado === false)
  throw new ProblemDetailsException([
   "status" => FORBIDDEN,
   "title" => "Página no registrada.",
   "type" => "/error/paginanoregistrada.html",
  ]);
}


K. Carpeta « errors »

Versión para imprimir.

A. errors / campoenblanco.html

<!DOCTYPE html>
<html lang="es">

<head>

 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width">

 <title>Campo en blanco</title>

</head>

<body>

 <h1>Campo en blanco</h1>

 <p>Pon texto en el campo obligatorio que está en blanco.</p>

</body>

</html>

1	<!DOCTYPE html>
2	<html lang="es">
3
4	<head>
5
6	<meta charset="UTF-8">
7	<meta name="viewport" content="width=device-width">
8
9	<title>Campo en blanco</title>
10
11	</head>
12
13	<body>
14
15	<h1>Campo en blanco</h1>
16
17	<p>Pon texto en el campo obligatorio que está en blanco.</p>
18
19	</body>
20
21	</html>

B. errors / errorinterno.html

<!DOCTYPE html>
<html lang="es">

<head>

 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width">

 <title>Error interno del servidor</title>

</head>

<body>

 <h1>Error interno del servidor</h1>

 <p>Se presentó de forma inesperada un error interno del servidor.</p>

</body>

</html>

1	<!DOCTYPE html>
2	<html lang="es">
3
4	<head>
5
6	<meta charset="UTF-8">
7	<meta name="viewport" content="width=device-width">
8
9	<title>Error interno del servidor</title>
10
11	</head>
12
13	<body>
14
15	<h1>Error interno del servidor</h1>
16
17	<p>Se presentó de forma inesperada un error interno del servidor.</p>
18
19	</body>
20
21	</html>

C. errors / faltavalor.html

<!DOCTYPE html>
<html lang="es">

<head>

 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width">

 <title>Falta un valor</title>

</head>

<body>

 <h1>Falta un valor</h1>

 <p>La solicitud no tiene un valor obligatorio.</p>

</body>

</html>

1	<!DOCTYPE html>
2	<html lang="es">
3
4	<head>
5
6	<meta charset="UTF-8">
7	<meta name="viewport" content="width=device-width">
8
9	<title>Falta un valor</title>
10
11	</head>
12
13	<body>
14
15	<h1>Falta un valor</h1>
16
17	<p>La solicitud no tiene un valor obligatorio.</p>
18
19	</body>
20
21	</html>

D. errors / paginaexpirada.html

<!DOCTYPE html>
<html lang="es">

<head>

 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width">

 <title>Tiempo de expiración excedido</title>

</head>

<body>

 <h1>Tiempo de expiración excedido</h1>

</body>

</html>

1	<!DOCTYPE html>
2	<html lang="es">
3
4	<head>
5
6	<meta charset="UTF-8">
7	<meta name="viewport" content="width=device-width">
8
9	<title>Tiempo de expiración excedido</title>
10
11	</head>
12
13	<body>
14
15	<h1>Tiempo de expiración excedido</h1>
16
17	</body>
18
19	</html>

E. errors / paginanoregistrada.html

<!DOCTYPE html>
<html lang="es">

<head>

 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width">

 <title>Página no registrada</title>

</head>

<body>

 <h1>Página no registrada</h1>

</body>

</html>

1	<!DOCTYPE html>
2	<html lang="es">
3
4	<head>
5
6	<meta charset="UTF-8">
7	<meta name="viewport" content="width=device-width">
8
9	<title>Página no registrada</title>
10
11	</head>
12
13	<body>
14
15	<h1>Página no registrada</h1>
16
17	</body>
18
19	</html>

F. errors / resultadonojson.html

<!DOCTYPE html>
<html lang="es">

<head>

 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width">

 <title>El resultado no puede representarse como JSON</title>

</head>

<body>

 <h1>El resultado no puede representarse como JSON</h1>

 <p>
  Debido a un error interno del servidor, el resultado generado, no se puede
  recuperar.
 </p>

</body>

</html>

1	<!DOCTYPE html>
2	<html lang="es">
3
4	<head>
5
6	<meta charset="UTF-8">
7	<meta name="viewport" content="width=device-width">
8
9	<title>El resultado no puede representarse como JSON</title>
10
11	</head>
12
13	<body>
14
15	<h1>El resultado no puede representarse como JSON</h1>
16
17	<p>
18	Debido a un error interno del servidor, el resultado generado, no se puede
19	recuperar.
20	</p>
21
22	</body>
23
24	</html>

G. errors / sintokens.html

<!DOCTYPE html>
<html lang="es">

<head>

 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width">

 <title>No hay arreglo de tokens</title>

</head>

<body>

 <h1>No hay arreglo de tokens</h1>

</body>

</html>

1	<!DOCTYPE html>
2	<html lang="es">
3
4	<head>
5
6	<meta charset="UTF-8">
7	<meta name="viewport" content="width=device-width">
8
9	<title>No hay arreglo de tokens</title>
10
11	</head>
12
13	<body>
14
15	<h1>No hay arreglo de tokens</h1>
16
17	</body>
18
19	</html>

1	{
2	"compilerOptions": {
3	"checkJs": true,
4	"strictNullChecks": true,
5	"target": "ES6",
6	"module": "Node16",
7	"moduleResolution": "Node16",
8	"lib": [
9	"ES2017",
10	"WebWorker",
11	"DOM"
12	]
18	}

M. Carpeta « dompurify »

Versión para imprimir.

A. dompurify / purify.min.js


1	/! @license DOMPurify 3.4.1 \| (c) Cure53 and other contributors \| Released under the Apache license 2.0 and Mozilla Public License 2.0 \| github.com/cure53/DOMPurify/blob/3.4.1/LICENSE /
2	!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e\|\|self).DOMPurify=t()}(this,function(){"use strict";const{entries:e,setPrototypeOf:t,isFrozen:n,getPrototypeOf:o,getOwnPropertyDescriptor:r}=Object;let{freeze:i,seal:a,create:l}=Object,{apply:c,construct:s}="undefined"!=typeof Reflect&&Reflect;i\|\|(i=function(e){return e}),a\|\|(a=function(e){return e}),c\|\|(c=function(e,t){for(var n=arguments.length,o=new Array(n>2?n-2:0),r=2;r<n;r++)o[r-2]=arguments[r];return e.apply(t,o)}),s\|\|(s=function(e){for(var t=arguments.length,n=new Array(t>1?t-1:0),o=1;o<t;o++)n[o-1]=arguments[o];return new e(...n)});const 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4

B. dompurify / purify.min.js.map

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1	<?php
2
3	require_once __DIR__ . "/../libservidorphp/manejaErrores.php";
4	require_once __DIR__ . "/../libservidorphp/creaToken.php";
5	require_once __DIR__ . "/../libservidorphp/devuelveJson.php";
6
7	session_start();
8	// Crea un token para la página "formulario" que expira en 5 minutos.
9	devuelveJson(["x" => ["value" => creaToken("formulario", 5)]]);
10

1	<?php
2
3	require_once __DIR__ . "/FORBIDDEN.php";
4	require_once __DIR__ . "/INTERNAL_SERVER_ERROR.php";
5	require_once __DIR__ . "/ProblemDetailsException.php";
6
7	function creaToken(string $pagina, int $duracionEnMinutos)
8	{
9	$criptografiaFuerte = true;
10
11	// Crea el token
12	$token = [
13	"expiracion" => time() + 60 * $duracionEnMinutos,
14	// El token es de 80 caracteres, criptográficamente fuerte.
15	"texto" => bin2hex(openssl_random_pseudo_bytes(80, $criptografiaFuerte))
16	];
17
18	// Verifica que ya haya tokens $pagina.
19	if (isset($_SESSION[$pagina])) {
20
21	$tokensParaPagina = $_SESSION[$pagina];
22
23	if (!is_array($tokensParaPagina))
24	throw new ProblemDetailsException([
25	"status" => INTERNAL_SERVER_ERROR,
26	" title" => "No hay arreglo de tokens.",
27	"type" => "/error/sintokens.html",
28	]);
29
30	// Como ya existe el arreglo, elimina los tokens expirados para esta pagina.
31	$time = time();
32	foreach ($tokensParaPagina as $llave => $tokenParaPagina) {
33	if ($tokenParaPagina["expiracion"] > $time) {
34	unset($tokensParaPagina[$llave]);
35	}
36	}
37
38	// Se puede usar uno o varios tokens por pagina.
39	$tokensParaPagina[] = $token;
40	$_SESSION[$pagina] = $tokensParaPagina;
41	} else {
42
43	// Se puede usar uno o varios tokens por pagina
44	$_SESSION[$pagina] = [$token];
45	}
46
47	return $token["texto"];
48	}
49

1	<?php
2
3	require_once __DIR__ . "/devuelveResultadoNoJson.php";
4
5	function devuelveJson($resultado)
6	{
7	$json = json_encode($resultado);
8	if ($json === false) {
9	devuelveResultadoNoJson();
10	} else {
11	header("Content-Type: application/json; charset=utf-8");
12	echo $json;
13	}
14	exit();
15	}
16

1	<?php
2
3	require_once __DIR__ . "/INTERNAL_SERVER_ERROR.php";
4
5	function devuelveResultadoNoJson()
6	{
7	http_response_code(INTERNAL_SERVER_ERROR);
8	header("Content-Type: application/problem+json; charset=utf-8");
9
10	echo '{' .
11	"status: " . INTERNAL_SERVER_ERROR .
12	'"title": "El resultado no puede representarse como JSON."' .
13	'"type": "/errors/resultadonojson.html"' .
14	'}';
15	}
16

1	<?php
2
3	/**
4	* Devuelve el texto de un parámetro enviado al
5	* servidor por medio de GET, POST o cookie.
6	*
7	* Si el parámetro no se recibe, devuelve false.
8	*/
9	function recibeTexto(string $parametro): false\|string
10	{
11	/* Si el parámetro está asignado en $_REQUEST,
12	* devuelve su valor; de lo contrario, devuelve false.
13	*/
14	$valor = isset($_REQUEST[$parametro])
15	? $_REQUEST[$parametro]
16	: false;
17	return $valor;
18	}
19

1	<?php
2
3	require_once __DIR__ . "/BAD_REQUEST.php";
4	require_once __DIR__ . "/recibeTexto.php";
5	require_once __DIR__ . "/ProblemDetailsException.php";
6
7	function recibeTextoObligatorio(string $parametro)
8	{
9	$texto = recibeTexto($parametro);
10
11	if ($texto === false)
12	throw new ProblemDetailsException([
13	"status" => BAD_REQUEST,
14	"title" => "Falta el valor $parametro.",
15	"type" => "/errors/faltavalor.html",
16	"detail" => "La solicitud no tiene el valor de $parametro."
17	]);
18
19	$trimTexto = trim($texto);
20
21	if ($trimTexto === "")
22	throw new ProblemDetailsException([
23	"status" => BAD_REQUEST,
24	"title" => "Campo $parametro en blanco.",
25	"type" => "/errors/campoenblanco.html",
26	"detail" => "Pon texto en el campo $parametro."
27	]);
28
29	return $trimTexto;
30	}
31

1	<?php
2
3	require_once __DIR__ . "/../libservidorphp/manejaErrores.php";
4	require_once __DIR__ . "/../libservidorphp/recibeTextoObligatorio.php";
5	require_once __DIR__ . "/../libservidorphp/validaToken.php";
6	require_once __DIR__ . "/../libservidorphp/devuelveJson.php";
7
8	session_start();
9
10	$token = recibeTextoObligatorio("x");
11	validaToken("formulario", $token);
12
13	// Si el token se halló, precesa normalmente la forma.
14
15	$saludo = recibeTextoObligatorio("saludo");
16	$nombre = recibeTextoObligatorio("nombre");
17
18	$resultado = "{$saludo} {$nombre}.";
19
20	devuelveJson($resultado);
21

26. Servicio con token

A. Introducción

B. Diagrama de despliegue

C. Hazlo funcionar (con videos)

D. Hazlo funcionar (texto)

E. Archivos

F. index.html

G. formulario.html

H. Carpeta « api »

A. api / procesa.php

B. api / vista-formulario.php

I. Carpeta « libclienteweb »

A. libclienteweb / consume.js

B. libclienteweb / descargaVista.js

C. libclienteweb / manejaErrores.js

D. libclienteweb / muestraError.js

E. libclienteweb / muestraObjeto.js

F. libclienteweb / ProblemDetailsError.js

G. libclienteweb / recibeJson.js

H. libclienteweb / submitFormRecibeJson.js

J. Carpeta « libservidorphp »

A. libservidorphp / BAD_REQUEST.php

B. libservidorphp / creaToken.php

C. libservidorphp / devuelveJson.php

D. libservidorphp / devuelveResultadoNoJson.php

E. libservidorphp / FORBIDDEN.php

F. libservidorphp / INTERNAL_SERVER_ERROR.php

G. libservidorphp / manejaErrores.php

H. libservidorphp / ProblemDetailsException.php

I. libservidorphp / recibeTexto.php

J. libservidorphp / recibeTextoObligatorio.php

K. libservidorphp / validaToken.php

K. Carpeta « errors »

A. errors / campoenblanco.html

B. errors / errorinterno.html

C. errors / faltavalor.html

D. errors / paginaexpirada.html

E. errors / paginanoregistrada.html

F. errors / resultadonojson.html

G. errors / sintokens.html

L. jsconfig.json

M. Carpeta « dompurify »

A. dompurify / purify.min.js

B. dompurify / purify.min.js.map

N. Resumen