modify-qris/dist/helpers/reader.js

Modify QRIS Generator is a javascript based libraries that enabling flexible payments with customizable amounts for improved efficiency and user experience

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.QRISReader = void 0;
const canvas_1 = require("canvas");
const jsqr_1 = require("jsqr");
const fs = require("fs");
class QRISReader {
    /**
     * Read QR Code from image file
     * @param imagePath Path to the image file
     * @returns Promise<string> QR Code content
     */
    static readFromFile(imagePath) {
        return __awaiter(this, void 0, void 0, function* () {
            try {
                // Check if file exists
                if (!fs.existsSync(imagePath)) {
                    throw new Error(`File not found: ${imagePath}`);
                }
                // Check if file is readable
                try {
                    fs.accessSync(imagePath, fs.constants.R_OK);
                }
                catch (error) {
                    throw new Error(`File is not readable: ${imagePath}`);
                }
                // Load image
                const image = yield (0, canvas_1.loadImage)(imagePath);
                // Create canvas
                const canvas = (0, canvas_1.createCanvas)(image.width, image.height);
                const ctx = canvas.getContext('2d');
                // Draw image to canvas
                ctx.drawImage(image, 0, 0);
                // Get image data
                const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
                // Decode QR Code
                const code = (0, jsqr_1.default)(imageData.data, imageData.width, imageData.height);
                if (!code) {
                    throw new Error('No QR Code found in image');
                }
                return code.data;
            }
            catch (error) {
                throw new Error(`Failed to read QR Code: ${error.message}`);
            }
        });
    }
    /**
     * Read QR Code from base64 image
     * @param base64Image Base64 encoded image string
     * @returns Promise<string> QR Code content
     */
    static readFromBase64(base64Image) {
        return __awaiter(this, void 0, void 0, function* () {
            try {
                // Remove data URL prefix if present
                const base64Data = base64Image.replace(/^data:image\/\w+;base64,/, '');
                // Validate base64 string
                if (!/^[A-Za-z0-9+/]*={0,2}$/.test(base64Data)) {
                    throw new Error('Invalid base64 string');
                }
                // Create buffer from base64
                const buffer = Buffer.from(base64Data, 'base64');
                // Load image from buffer
                const image = yield (0, canvas_1.loadImage)(buffer);
                // Create canvas
                const canvas = (0, canvas_1.createCanvas)(image.width, image.height);
                const ctx = canvas.getContext('2d');
                // Draw image to canvas
                ctx.drawImage(image, 0, 0);
                // Get image data
                const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
                // Decode QR Code
                const code = (0, jsqr_1.default)(imageData.data, imageData.width, imageData.height);
                if (!code) {
                    throw new Error('No QR Code found in image');
                }
                return code.data;
            }
            catch (error) {
                throw new Error(`Failed to read QR Code: ${error.message}`);
            }
        });
    }
    /**
     * Validate if the content is a valid QRIS
     * @param content QR Code content
     * @returns boolean
     */
    static isValidQRIS(content) {
        // Basic QRIS validation
        // Check if it starts with 000201
        if (!content.startsWith('000201')) {
            return false;
        }
        // Check if it contains required fields
        const requiredFields = ['26', '52', '53', '54', '58', '59', '60', '61'];
        for (const field of requiredFields) {
            if (!content.includes(field)) {
                return false;
            }
        }
        return true;
    }
    /**
     * Ensure directory exists
     * @param dirPath Directory path
     */
    static ensureDirectoryExists(dirPath) {
        if (!fs.existsSync(dirPath)) {
            fs.mkdirSync(dirPath, { recursive: true });
        }
    }
}
exports.QRISReader = QRISReader;