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/** |
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* Cap (capjs.js.org) widget loader for Contact Forms. |
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* |
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* Each cap field registers itself through the global queue |
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* `accuaformCapQueue` (so registration works whether the field markup is |
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* parsed before or after this file loads). The cap-widget script is loaded |
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* from the site owner's own Cap Standalone instance - no third-party request |
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* is ever made. |
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* |
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* The widget solves a proof-of-work challenge when the visitor clicks it and |
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* emits a single-use token in its `solve` event. The token is mirrored into |
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* the plugin's own hidden input (name accua-forms-cap-response, id = field |
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* id) so server-side validation and the error summary anchoring work exactly |
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* like the other captcha fields. Server-side validation is fail-closed: an |
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* empty or stale token is rejected by the Cap siteverify endpoint. |
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* |
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* Tokens are single-use, so after every AJAX round trip (success or |
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* validation error) the handler generated by AccuaForm.php calls |
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* accuaformCap.reset() so a retry solves a fresh challenge. |
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*/ |
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|
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(function ($) { |
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var registered = {}; // inputId -> {endpoint, widgetUrl, wasmUrl, i18n} |
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var widgets = {}; // inputId -> cap-widget DOM element |
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var widgetPromise = null; |
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|
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// Resolves when the cap-widget custom element is defined (never rejects: |
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// on timeout the container simply stays empty and the server rejects the |
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// token-less submission). |
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function loadWidget(cfg) { |
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if (widgetPromise) { |
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return widgetPromise; |
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} |
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widgetPromise = new Promise(function (resolve) { |
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if (window.customElements && window.customElements.get('cap-widget')) { |
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resolve(); |
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return; |
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} |
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// Point the WASM solver at the same Cap instance before the widget |
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// script initializes (its default is a public CDN). |
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if (cfg.wasmUrl && !window.CAP_CUSTOM_WASM_URL) { |
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window.CAP_CUSTOM_WASM_URL = cfg.wasmUrl; |
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} |
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if (!document.querySelector('script[data-accua-cap-widget]')) { |
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var script = document.createElement('script'); |
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script.src = cfg.widgetUrl; |
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script.async = true; |
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script.setAttribute('data-accua-cap-widget', '1'); |
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document.head.appendChild(script); |
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} |
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var waited = 0; |
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var poll = setInterval(function () { |
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waited += 200; |
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if ((window.customElements && window.customElements.get('cap-widget')) || waited >= 20000) { |
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clearInterval(poll); |
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resolve(); |
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} |
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}, 200); |
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}); |
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return widgetPromise; |
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} |
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|
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function createWidget(inputId) { |
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var cfg = registered[inputId]; |
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var input = document.getElementById(inputId); |
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var container = document.getElementById(inputId + '-widget'); |
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if (!cfg || !input || !container || container.querySelector('cap-widget')) { |
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return; |
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} |
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if (!(window.customElements && window.customElements.get('cap-widget'))) { |
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return; // loadWidget() timed out |
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} |
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|
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var widget = document.createElement('cap-widget'); |
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widget.setAttribute('data-cap-api-endpoint', cfg.endpoint); |
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if (cfg.i18n) { |
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for (var key in cfg.i18n) { |
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if (Object.prototype.hasOwnProperty.call(cfg.i18n, key) && cfg.i18n[key]) { |
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widget.setAttribute('data-cap-i18n-' + key, cfg.i18n[key]); |
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} |
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} |
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} |
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|
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widget.addEventListener('solve', function (e) { |
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input.value = (e && e.detail && e.detail.token) ? e.detail.token : ''; |
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}); |
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widget.addEventListener('reset', function () { |
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input.value = ''; |
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}); |
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widget.addEventListener('error', function () { |
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input.value = ''; |
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}); |
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|
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container.appendChild(widget); |
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widgets[inputId] = widget; |
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} |
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|
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// Public API used by the AJAX submit handler generated in AccuaForm.php: |
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// after every AJAX response the used (single-use) tokens are cleared and |
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// the widgets reset so a retry solves a fresh challenge. |
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window.accuaformCap = { |
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reset: function (formEl) { |
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$(formEl).find('input.accua_forms_cap_input').each(function () { |
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this.value = ''; |
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var widget = widgets[this.id]; |
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if (widget && typeof widget.reset === 'function') { |
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try { |
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widget.reset(); |
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} catch (err) { |
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// ignore - widget may not be fully initialized yet |
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} |
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} |
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}); |
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} |
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}; |
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|
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// item = [inputId, {endpoint, widgetUrl, wasmUrl, i18n}, language] |
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function register(item) { |
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var id = item[0]; |
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if (registered[id]) { |
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return; |
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} |
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registered[id] = item[1]; |
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loadWidget(item[1]).then(function () { |
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createWidget(id); |
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}); |
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} |
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|
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var queue = window.accuaformCapQueue = window.accuaformCapQueue || []; |
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for (var i = 0; i < queue.length; i++) { |
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register(queue[i]); |
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} |
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queue.push = function (item) { |
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register(item); |
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return queue.length; |
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}; |
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})(jQuery); |
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|
