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LNbits/static/plugins/bolt11/utils.js

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+const bech32CharValues = 'qpzry9x8gf2tvdw0s3jn54khce6mua7l';
+
+function byteArrayToInt(byteArray) {
+    let value = 0;
+    for (let i = 0; i < byteArray.length; ++i) {
+        value = (value << 8) + byteArray[i];
+    }
+    return value;
+}
+
+function bech32ToInt(str) {
+    let sum = 0;
+    for (let i = 0; i < str.length; i++) {
+        sum = sum * 32;
+        sum = sum + bech32CharValues.indexOf(str.charAt(i));
+    }
+    return sum;
+}
+
+function bech32ToFiveBitArray(str) {
+    let array = [];
+    for (let i = 0; i < str.length; i++) {
+        array.push(bech32CharValues.indexOf(str.charAt(i)));
+    }
+    return array;
+}
+
+function fiveBitArrayTo8BitArray(int5Array, includeOverflow) {
+    let count = 0;
+    let buffer = 0;
+    let byteArray = [];
+    int5Array.forEach((value) => {
+        buffer = (buffer << 5) + value;
+        count += 5;
+        if (count >= 8) {
+            byteArray.push(buffer >> (count - 8) & 255);
+            count -= 8;
+        }
+    });
+    if (includeOverflow && count > 0) {
+        byteArray.push(buffer << (8 - count) & 255);
+    }
+    return byteArray;
+}
+
+function bech32ToUTF8String(str) {
+    let int5Array = bech32ToFiveBitArray(str);
+    let byteArray = fiveBitArrayTo8BitArray(int5Array);
+
+    let utf8String = '';
+    for (let i = 0; i < byteArray.length; i++) {
+        utf8String += '%' + ('0' + byteArray[i].toString(16)).slice(-2);
+    }
+    return decodeURIComponent(utf8String);
+}
+
+function byteArrayToHexString(byteArray) {
+    return Array.prototype.map.call(byteArray, function (byte) {
+        return ('0' + (byte & 0xFF).toString(16)).slice(-2);
+    }).join('');
+}
+
+function textToHexString(text) {
+    let hexString = '';
+    for (let i = 0; i < text.length; i++) {
+        hexString += text.charCodeAt(i).toString(16);
+    }
+    return hexString;
+}
+
+function epochToDate(int) {
+    let date = new Date(int * 1000);
+    return date.toUTCString();
+}
+
+function isEmptyOrSpaces(str){
+    return str === null || str.match(/^ *$/) !== null;
+}
+
+function toFixed(x) {
+    if (Math.abs(x) < 1.0) {
+        var e = parseInt(x.toString().split('e-')[1]);
+        if (e) {
+            x *= Math.pow(10,e-1);
+            x = '0.' + (new Array(e)).join('0') + x.toString().substring(2);
+        }
+    } else {
+        var e = parseInt(x.toString().split('+')[1]);
+        if (e > 20) {
+            e -= 20;
+            x /= Math.pow(10,e);
+            x += (new Array(e+1)).join('0');
+        }
+    }
+    return x;
+}