pdfParser.js

"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());
    });
};
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const verify_pdf_1 = __importDefault(require("@ninja-labs/verify-pdf"));
const pdf_lib_1 = require("pdf-lib");
const pdfdataextract_1 = require("pdfdataextract");
const config_1 = require("./config");
const { PDFDocument } = require("pdf-lib");
class PDFparser {
    constructor(document) {
        this.getPDFMeta = () => __awaiter(this, void 0, void 0, function* () {
            try {
                const pdfMeta = yield pdfdataextract_1.PdfData.extract(this.document, config_1.config);
                const signaturesMeta = yield verify_pdf_1.default(this.document);
                return {
                    verified: signaturesMeta.verified,
                    authenticity: signaturesMeta.authenticity,
                    integrity: signaturesMeta.integrity,
                    expired: signaturesMeta.expired,
                    meta: {
                        certs: signaturesMeta.certs,
                    },
                    pages: pdfMeta.pages,
                    fingerpring: pdfMeta.fingerprint,
                    creation_data: pdfMeta.info.CreationDate,
                    creator: pdfMeta.info.Creator,
                    author: pdfMeta.info.Author,
                    title: pdfMeta.info.Title,
                    description: pdfMeta.info.Keywords,
                    mod_date: pdfMeta.info.ModDate,
                };
            }
            catch (error) {
                console.error(error);
                throw new Error("Could not get pdf metadata");
            }
        });
        this.insertQrCode = (imgBytes) => __awaiter(this, void 0, void 0, function* () {
            const pdfDoc = yield PDFDocument.load(this.document);
            const img = yield pdfDoc.embedPng(imgBytes);
            const scaled = img.scale(0.5);
            const pages = pdfDoc.getPages();
            const firstPage = pages[0];
            firstPage.drawImage(img, {
                x: firstPage.getWidth() / 2 - scaled.width / 2,
                y: firstPage.getHeight() / 2 - scaled.height / 2,
                width: scaled.width,
                height: scaled.height,
            });
            const link = this.createPageLinkAnnotation(firstPage, "https://pdf-lib.js.org/", {
                imgXPos: firstPage.getWidth() / 2 - scaled.width / 2,
                imgYPos: firstPage.getHeight() / 2 - scaled.height / 2,
                imgWidth: scaled.width,
                imagHeight: scaled.height,
            });
            firstPage.node.set(pdf_lib_1.PDFName.of("Annots"), pdfDoc.context.obj([link]));
            const pdfBytes = yield pdfDoc.save();
            return pdfBytes;
        });
        this.createPageLinkAnnotation = (page, uri, { imgXPos, imgYPos, imgWidth, imagHeight }) => page.doc.context.register(page.doc.context.obj({
            Type: "Annot",
            Subtype: "Link",
            Rect: [imgXPos, imgYPos, imgXPos + imgWidth, imgYPos + imagHeight],
            A: {
                Type: "Action",
                S: "URI",
                URI: pdf_lib_1.PDFString.of(uri),
            },
        }));
        this.document = document;
        this.config = config_1.config;
    }
}
exports.default = PDFparser;