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overleaf/services/web/frontend/js/features/form-helpers/hydrate-form.js

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JavaScript
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import classNames from 'classnames'
import { FetchError, postJSON } from '../../infrastructure/fetch-json'
import { canSkipCaptcha, validateCaptchaV2 } from './captcha'
import inputValidator from './input-validator'
import { disableElement, enableElement } from '../utils/disableElement'
// Form helper(s) to handle:
// - Attaching to the relevant form elements
// - Listening for submit event
// - Validating captcha
// - Sending fetch request
// - Redirect handling
// - Showing errors
// - Disabled state
function formSubmitHelper(formEl) {
formEl.addEventListener('submit', async e => {
e.preventDefault()
formEl.dispatchEvent(new Event('pending'))
const messageBag = []
try {
let data
try {
const captchaResponse = await validateCaptcha(formEl)
data = await sendFormRequest(formEl, captchaResponse)
} catch (e) {
if (
e instanceof FetchError &&
e.data?.errorReason === 'cannot_verify_user_not_robot'
) {
// Trigger captcha unconditionally.
const captchaResponse = await validateCaptchaV2()
if (!captchaResponse) {
throw e
}
data = await sendFormRequest(formEl, captchaResponse)
} else {
throw e
}
}
formEl.dispatchEvent(new Event('sent'))
// Handle redirects
if (data.redir) {
window.location = data.redir
return
}
// Show a success message (e.g. used on 2FA page)
if (data.message) {
messageBag.push({
type: 'message',
text: data.message.text || data.message,
})
}
// Let the user re-submit the form.
formEl.dispatchEvent(new Event('idle'))
} catch (error) {
let text = error.message
if (error instanceof FetchError) {
text = error.getUserFacingMessage()
}
messageBag.push({
type: 'error',
key: error.data?.message?.key,
text,
})
// Let the user re-submit the form.
formEl.dispatchEvent(new Event('idle'))
} finally {
showMessages(formEl, messageBag)
}
})
}
async function validateCaptcha(formEl) {
let captchaResponse
if (formEl.hasAttribute('captcha')) {
if (
formEl.getAttribute('action') === '/login' &&
(await canSkipCaptcha(new FormData(formEl).get('email')))
) {
// The email is present in the deviceHistory, and we can skip the display
// of a captcha challenge.
// The actual login POST request will be checked against the deviceHistory
// again and the server can trigger the display of a captcha if needed by
// sending a 400 with errorReason set to 'cannot_verify_user_not_robot'.
return ''
}
captchaResponse = await validateCaptchaV2()
}
return captchaResponse
}
async function sendFormRequest(formEl, captchaResponse) {
const formData = new FormData(formEl)
if (captchaResponse) {
formData.set('g-recaptcha-response', captchaResponse)
}
const body = Object.fromEntries(formData.entries())
const url = formEl.getAttribute('action')
return postJSON(url, { body })
}
function showMessages(formEl, messageBag) {
const messagesEl = formEl.querySelector('[data-ol-form-messages]')
if (!messagesEl) return
// Clear content
messagesEl.textContent = ''
formEl.querySelectorAll('[data-ol-custom-form-message]').forEach(el => {
el.hidden = true
})
// Render messages
messageBag.forEach(message => {
if (message.key) {
formEl
.querySelectorAll(`[data-ol-custom-form-message="${message.key}"]`)
.forEach(el => {
el.hidden = false
})
return
}
const messageEl = document.createElement('div')
messageEl.className = classNames('alert', {
'alert-danger': message.type === 'error',
'alert-success': message.type !== 'error',
})
messageEl.textContent = message.text
messageEl.setAttribute('aria-live', 'assertive')
messageEl.setAttribute(
'role',
message.type === 'error' ? 'alert' : 'status'
)
messagesEl.append(messageEl)
})
}
export function inflightHelper(el) {
const disabledInflight = el.querySelectorAll('[data-ol-disabled-inflight]')
const showWhenNotInflight = el.querySelectorAll('[data-ol-inflight="idle"]')
const showWhenInflight = el.querySelectorAll('[data-ol-inflight="pending"]')
el.addEventListener('pending', () => {
disabledInflight.forEach(disableElement)
toggleDisplay(showWhenNotInflight, showWhenInflight)
})
el.addEventListener('idle', () => {
disabledInflight.forEach(enableElement)
toggleDisplay(showWhenInflight, showWhenNotInflight)
})
}
function formSentHelper(el) {
const showWhenPending = el.querySelectorAll('[data-ol-not-sent]')
const showWhenDone = el.querySelectorAll('[data-ol-sent]')
if (showWhenDone.length === 0) return
el.addEventListener('sent', () => {
toggleDisplay(showWhenPending, showWhenDone)
})
}
function formValidationHelper(el) {
el.querySelectorAll('input').forEach(inputEl => {
if (
inputEl.willValidate &&
!inputEl.hasAttribute('data-ol-no-custom-form-validation-messages')
) {
inputValidator(inputEl)
}
})
}
function formAutoSubmitHelper(el) {
if (el.hasAttribute('data-ol-auto-submit')) {
setTimeout(() => {
el.querySelector('[type="submit"]').click()
}, 0)
}
}
export function toggleDisplay(hide, show) {
hide.forEach(el => {
el.hidden = true
})
show.forEach(el => {
el.hidden = false
})
}
function hydrateAsyncForm(el) {
formSubmitHelper(el)
inflightHelper(el)
formSentHelper(el)
formValidationHelper(el)
formAutoSubmitHelper(el)
}
function hydrateRegularForm(el) {
inflightHelper(el)
formValidationHelper(el)
el.addEventListener('submit', () => {
el.dispatchEvent(new Event('pending'))
})
formAutoSubmitHelper(el)
}
document.querySelectorAll(`[data-ol-async-form]`).forEach(hydrateAsyncForm)
document.querySelectorAll(`[data-ol-regular-form]`).forEach(hydrateRegularForm)