https://shop.albw.de/assets/frontend/vendor/barcode/barcode-helper.js

1/**
2 * Helper class for barcode processing
3 */
4(function (sellsite) {
5    sellsite.barcode = {};
6
7    /**
8     * Processes the barcode data and returns the barcode string
9     * @param data - The barcode data
10     * @param useChecksum - Whether to use the checksum or not
11     * @returns {Promise<unknown>} - Promise that resolves with the barcode string
12     */
13    sellsite.barcode.processBarcode = function(data, useChecksum) {
14        let code;
15        let isITF;
16
17        // if data contains barcode and type, we can directly use it...
18        if (data.barcode !== undefined) {
19            code = data.barcode;
20            isITF = data.type === 'i25';
21        } else {
22            // if not, we need to parse the JSON (this happens if the barcode is read from native app)
23            const json = JSON.parse(data);
24            code = json.barcode;
25            isITF = json.type === "INTERLEAVED_2_OF_5" || json.type === "ITF";
26        }
27
28        return new Promise(function (resolve, reject) {
29            if (isITF && useChecksum && code.length > 0) {
30                if (isChecksumValid(code)) {
31                    resolve(trimChecksum(code));
32                }
33                reject("Invalid checksum");
34            }
35            resolve(code);
36        });
37    }
38
39    /**
40     * Checks if the checksum of the barcode is valid
41     * @param barcode - The barcode to check
42     * @returns {boolean} - True if the checksum is valid, false otherwise
43     */
44    isChecksumValid = function(barcode)  {
45        const remainingCode = trimChecksum(barcode);
46        const checksum = parseInt(barcode[barcode.length - 1]);
47        let sum = 0;
48
49        for (let i = 0; i < remainingCode.length; i++) {
50            if (i % 2 === 0) {
51                sum += parseInt(remainingCode[i]);
52            } else {
53                sum += 3 * parseInt(remainingCode[i]);
54            }
55        }
56
57        sum = sum % 10;
58        if (sum !== 0) {
59            sum = 10 - sum;
60        }
61
62        return checksum === sum;
63    }
64
65    /**
66     * Trims the checksum from the barcode
67     * @param barcode - The barcode to trim
68     * @returns {string|*|string} - The barcode without the checksum
69     */
70    trimChecksum = function(barcode) {
71        return barcode.substring(1, barcode.length - 1);
72    }
73
74}(window.sellsite = window.sellsite || {}));