https://coinspondent.de/wp-content/plugins/bitcoin-lightning-publisher/public/js/bln-webln-button.js?ver=1

1document.addEventListener("DOMContentLoaded", function(event) {
2    (function () {
3        var checkPaidInterval = null;
4        var wp_rest_base_url = LN_Paywall.rest_base;
5        var LN_Paywall_Spinner =
6        '<svg class="LNP_spinner" viewBox="0 0 50 50"><circle class="LNP_path" cx="25" cy="25" r="20" fill="none" stroke-width="5"></circle></svg>';
7        var LN_Paywall_Copy = '<svg xmlns="http://www.w3.org/2000/svg" class="LNP_copy" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor"><path class="LNP_path" stroke-linecap="round" stroke-linejoin="round" d="M15.75 17.25v3.375c0 .621-.504 1.125-1.125 1.125h-9.75a1.125 1.125 0 01-1.125-1.125V7.875c0-.621.504-1.125 1.125-1.125H6.75a9.06 9.06 0 011.5.124m7.5 10.376h3.375c.621 0 1.125-.504 1.125-1.125V11.25c0-4.46-3.243-8.161-7.5-8.876a9.06 9.06 0 00-1.5-.124H9.375c-.621 0-1.125.504-1.125 1.125v3.5m7.5 10.375H9.375a1.125 1.125 0 01-1.125-1.125v-9.25m12 6.625v-1.875a3.375 3.375 0 00-3.375-3.375h-1.5a1.125 1.125 0 01-1.125-1.125v-1.5a3.375 3.375 0 00-3.375-3.375H9.75" /></svg>';
8
9        function pay(invoice, options)
10        {
11            if (!window.webln) {
12                showQRCode(invoice, options);
13                return startWatchingForPayment(invoice);
14            }
15            return window.webln.enable()
16            .then(
17                function () {
18                    window.webln
19                    .sendPayment(invoice.payment_request)
20                    .then(
21                        (response) => {
22                            window.LNP_CURRENT_PREIMAGE =
23                            response.preimage || response.payment_preimage;
24                        }
25                    )
26                    .catch(
27                        function (e) {
28                            console.error(e);
29                            showQRCode(invoice, options);
30                        }
31                    );
32                    return startWatchingForPayment(invoice);
33                }
34            )
35            .catch(
36                function (err) {
37                    console.error(err);
38                    showQRCode(invoice, options);
39                    return startWatchingForPayment(invoice);
40                }
41            );
42        }
43
44        function startWatchingForPayment(invoice)
45        {
46            stopWatchingForPayment();
47            return new Promise(
48                function (resolve, reject) {
49                    checkPaidInterval = setInterval(
50                        checkPaymentStatus(invoice, resolve),
51                        2500
52                    );
53                }
54            );
55        }
56
57        function stopWatchingForPayment()
58        {
59            window.LNP_CURRENT_PREIMAGE = null;
60            if (checkPaidInterval) {
61                clearTimeout(checkPaidInterval);
62                checkPaidInterval = null;
63            }
64        }
65
66        function checkPaymentStatus(invoice, callback)
67        {
68            if (!invoice || !invoice.token) {
69                console.log("Ligthning invoice missing");
70                return;
71            }
72            return function () {
73                let body = {
74                    token: invoice.token,
75                    preimage: window.LNP_CURRENT_PREIMAGE,
76                    t: Date.now()
77                };
78                fetch(
79                    wp_rest_base_url+'/invoices/verify', {
80                        method: "POST",
81                        credentials: "same-origin",
82                        cache: "no-cache",
83                        body: JSON.stringify(body),
84                        headers: {
85                            "Content-Type": "application/json",
86                        },
87                    }
88                ).then(
89                    function (response) {
90                        if (response.ok) {
91                            response.json().then(
92                                function () {
93                                    stopWatchingForPayment();
94                                    callback(invoice);
95                                }
96                            );
97                        }
98                    }
99                );
100            };
101        }
102
103        function showQRCode(invoice, options)
104        {
105            options.target.innerHTML = `<div class="wp-lnp-qrcode">
106            <a href="lightning:${invoice.payment_request
107            }">

107<img src="https://quickchart.io/chart?cht=qr&chs=200x200&chl=${
108              invoice.payment_request
109            }"></a>
110            <br />
111            <a href="lightning:${invoice.payment_request}">${invoice.payment_request.substr(0, 36)}...</a><span onClick="navigator.clipboard.writeText('${invoice.payment_request}');" class="wp-lnp-copy">${LN_Paywall_Copy}</span>
112            </div>`;
113        }
114
115        function requestPayment(params, options)
116        {
117            return fetch(
118                wp_rest_base_url+'/invoices', {
119                    method: "POST",
120                    credentials: "same-origin",
121                    cache: "no-cache",
122                    body: JSON.stringify(params),
123                    headers: {
124                        "Content-Type": "application/json",
125                    },
126                }
127            )
128                .then(
129                    function (resp) {
130                        return resp.json();
131                    }
132                )
133                .then(
134                    function (invoice) {
135                        if (!invoice || !invoice.payment_request) {
136                            console.error("Failed to generate lightning invoice", invoice);
137                            throw new Error("Failed to generate lightning invoice " + JSON.stringify(invoice));
138                        }
139                        return pay(invoice, options);
140                    }
141                );
142        }
143
144        function initWeblnButtons()
145        {
146            var buttons = document.querySelectorAll('.wp-lnp-webln-button')
147            if (buttons.length === 0) {
148                return;
149            }
150            buttons.forEach(
151                function (button) {
152                    button.addEventListener(
153                        "click", function (e) {
154                            e.preventDefault();
155                            this.setAttribute("disabled", "");
156
157                            var thankyouMessage = this.dataset.success || "Thanks!";
158                            var paymentRequestArgs = { amount: this.dataset.amount, currency: this.dataset.currency };
159                            var wrapper = this.closest(".wp-lnp-webln-button-wrapper");
160
161                            wrapper.innerHTML = '<div class="wp-lnp-webln-button-spinner">' + LN_Paywall_Spinner + '</div>';
162
163                            requestPayment(
164                                paymentRequestArgs,
165                                { target: wrapper }
166                            )
167                            .then(
168                                function (invoice) {
169                                    wrapper.innerHTML = '<div class="wp-lnp-webln-button-thanks">' + thankyouMessage + '</div>';
170                                }
171                            )
172                            .catch(
173                                function (e) {
174                                    console.error(e);
175                                    alert("Sorry, something went wrong.");
176                                }
177                            );
178                        }
179                    );
180                }
181            );
182        }
183
184        initWeblnButtons();
185    })();
186});