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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
export class FormScenarios {
/**
* Caches the scores when running the SignUpFormRuleset against a form
*/
static #cachedSignUpFormScore = new WeakMap();
/**
* Detect usage scenarios of the form.
*
* @param {object} options named options
* @param {HTMLInputElement} [options.input] where current focus is
* @param {FormLike} [options.form]
*
* @returns {Array<string>} detected scenario names
*/
static detect({ input, form }) {
const scenarios = {};
if (!FormScenarios.signupDetectionEnabled) {
return scenarios;
}
// Running simple heuristics first, because running the SignUpFormRuleset is expensive
if (
input &&
// At the moment Relay integration is the only interested party in "sign up form",
// so we optimize a bit by checking if it's enabled or not.
FirefoxRelayUtils.isRelayInterestedField(input)
) {
form ??= FormLikeFactory.findRootForField(input);
scenarios.signUpForm = FormScenarios.#isProbablyASignUpForm(form);
}
return scenarios;
}
/**
* Determine if the form is a sign-up form.
* This is done by running the rules of the Fathom SignUpFormRuleset against the form and calucating a score between 0 and 1.
* It's considered a sign-up form, if the score is higher than the confidence threshold (default=0.75)
*
* @param {HTMLFormElement} formElement
* @returns {boolean} returns true if the calculcated score is higher than the confidenceThreshold
*/
static #isProbablyASignUpForm(formElement) {
let score = FormScenarios.#cachedSignUpFormScore.get(formElement);
if (!score) {
TelemetryStopwatch.start("PWMGR_SIGNUP_FORM_DETECTION_MS");
try {
const { rules, type } = SignUpFormRuleset;
const results = rules.against(formElement);
score = results.get(formElement).scoreFor(type);
TelemetryStopwatch.finish("PWMGR_SIGNUP_FORM_DETECTION_MS");
} finally {
if (TelemetryStopwatch.running("PWMGR_SIGNUP_FORM_DETECTION_MS")) {
TelemetryStopwatch.cancel("PWMGR_SIGNUP_FORM_DETECTION_MS");
}
}
FormScenarios.#cachedSignUpFormScore.set(formElement, score);
}
const threshold = FormScenarios.signupDetectionConfidenceThreshold;
return score > threshold;
}
}
XPCOMUtils.defineLazyPreferenceGetter(
FormScenarios,
"signupDetectionConfidenceThreshold",
"signon.signupDetection.confidenceThreshold",
"0.75"
);
XPCOMUtils.defineLazyPreferenceGetter(
FormScenarios,
"signupDetectionEnabled",
"signon.signupDetection.enabled",
true
);