https://mohajerdanesh.com/wp-content/plugins/gravityforms-local-guard/assets/local-guard.js?ver=1.1.0

1(function () {
2    'use strict';
3
4    var initialized = {};
5	var pending = {};
6
7    function sha256(value) {
8        return crypto.subtle.digest('SHA-256', new TextEncoder().encode(value)).then(function (buffer) {
9            return Array.prototype.map.call(new Uint8Array(buffer), function (byte) {
10                return byte.toString(16).padStart(2, '0');
11            }).join('');
12        });
13    }
14
15    async function createProof(token, difficulty) {
16        if (!difficulty) {
17            return 0;
18        }
19
20        var prefix = '0'.repeat(difficulty);
21        var nonce = 0;
22        while (nonce < 2000000) {
23            var hash = await sha256(token + '|' + nonce);
24            if (hash.indexOf(prefix) === 0) {
25                return nonce;
26            }
27            nonce++;
28        }
29        throw new Error('Proof generation failed.');
30    }
31
32    async function prepare(formId, force) {
33        var form = document.getElementById('gform_' + formId);
34        if (!form || (!force && initialized[formId] === form)) {
35            return;
36        }
37		if (pending[formId]) {
38			return pending[formId];
39		}
40        initialized[formId] = form;
41
42        var tokenField = form.querySelector('[name="gflg_token"]');
43        var proofField = form.querySelector('[name="gflg_proof"]');
44        var readyField = form.querySelector('[name="gflg_ready"]');
45        if (!tokenField || !proofField || !readyField || !window.crypto || !window.crypto.subtle) {
46            return;
47        }
48
49		readyField.value = '0';
50		pending[formId] = (async function () {
51		try {
52            var body = new URLSearchParams({action: GFLocalGuard.action, form_id: String(formId)});
53            var response = await fetch(GFLocalGuard.ajaxUrl, {
54                method: 'POST',
55                credentials: 'same-origin',
56                headers: {'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'},
57                body: body.toString()
58            });
59            var result = await response.json();
60            if (!result.success) {
61                return;
62            }
63            tokenField.value = result.data.token;
64            proofField.value = await createProof(result.data.token, Number(result.data.difficulty || 0));
65            readyField.value = '1';
66        } catch (error) {
67            readyField.value = '0';
68		} finally {
69			delete pending[formId];
70		}
71		}());
72
73		return pending[formId];
74    }
75
76	function guardEarlySubmit(formId, form) {
77		if (form.dataset.gflgSubmitGuard === '1') {
78			return;
79		}
80		form.dataset.gflgSubmitGuard = '1';
81		var submitter = null;
82		form.addEventListener('click', function (event) {
83			var candidate = event.target.closest('button[type="submit"], input[type="submit"]');
84			if (candidate) {
85				submitter = candidate;
86			}
87		}, true);
88		form.addEventListener('submit', function (event) {
89			var readyField = form.querySelector('[name="gflg_ready"]');
90			if (!readyField || readyField.value === '1') {
91				return;
92			}
93			event.preventDefault();
94			event.stopImmediatePropagation();
95			Promise.resolve(pending[formId] || prepare(formId, true)).then(function () {
96				if (readyField.value === '1') {
97					if (form.requestSubmit) {
98						form.requestSubmit(submitter || undefined);
99					} else if (submitter) {
100						submitter.click();
101					}
102				}
103			});
104		}, true);
105	}
106
107    function boot() {
108		(window.GFLocalGuardForms || []).forEach(function (formId) {
109			var form = document.getElementById('gform_' + formId);
110			if (form) {
111				guardEarlySubmit(formId, form);
112			}
113			prepare(formId);
114		});
115    }
116
117    document.addEventListener('DOMContentLoaded', boot);
118    document.addEventListener('gform/postRender', function (event) {
119        if (event.detail && event.detail.formId) {
120            delete initialized[event.detail.formId];
121        }
122		boot();
123    });
124    document.addEventListener('gform_page_loaded', function (event) {
125        var formId = event.detail && event.detail.form_id;
126        if (formId) {
127            delete initialized[formId];
128        }
129		boot();
130    });
131
132    if (window.jQuery) {
133        window.jQuery(document).on('gform_post_render gform_page_loaded', function (event, formId) {
134            if (formId) {
135                delete initialized[formId];
136            }
137			boot();
138        });
139    }
140
141    if (document.readyState !== 'loading') {
142        boot();
143    }
144
145	// Refresh long-lived forms before their server token expires.
146	window.setInterval(function () {

147		(window.GFLocalGuardForms || []).forEach(function (formId) {
148			prepare(formId, true);
149		});
150	}, 25 * 60 * 1000);
151}());