487 lines
15 KiB
JavaScript
487 lines
15 KiB
JavaScript
const puppeteer = require('puppeteer');
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const path = require('path');
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const { exec } = require('child_process');
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const fs = require('fs').promises;
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const gs = require('ghostscript4js');
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const { PDFDocument, rgb } = require('pdf-lib');
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const { Catalog } = require('../models/catalog');
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const { MyPage } = require('../models/mypage');
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const tools = require('../tools/general');
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const shared_consts = require('../tools/shared_nodejs');
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const { compress } = require('compress-pdf');
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class GenPdf {
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constructor(idapp) {
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this.idapp = idapp;
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this.browser = null;
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}
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async launch() {
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this.browser = await puppeteer.launch({
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args: ['--no-sandbox', '--disable-setuid-sandbox'],
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});
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}
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async close() {
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if (this.browser) {
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await this.browser.close();
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this.browser = null;
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}
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}
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inchesToPixels(inches, stampa) {
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if (stampa) {
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return Math.floor(inches * 300);
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} else {
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return Math.floor(inches * 96);
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}
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}
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mmToInches(mm) {
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return mm / 25.4;
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}
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async autoScroll(page) {
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console.log('inizia a scrollare...');
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// Esegui lo scroll fino a quando tutta la pagina non è stata scrollata
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await page.evaluate(async () => {
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await new Promise((resolve) => {
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let totalHeight = 0;
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const distance = 100; // distanza dello scroll ad ogni intervallo
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const delay = 40; // tempo di intervallo in ms
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const scroll = async () => {
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// Esegui lo scroll
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window.scrollBy(0, distance);
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totalHeight += distance;
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// Verifica se è stato scrollato tutto il corpo della pagina
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if (totalHeight < document.body.scrollHeight) {
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setTimeout(scroll, delay); // Se non è finito lo scroll, continua
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} else {
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resolve(); // Scroll terminato
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}
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};
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scroll(); // Avvia lo scroll
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});
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});
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}
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async generatePdfFromUrl(url, filenameOut, options = {}) {
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if (!this.browser) {
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throw new Error('Browser non avviato. Chiama launch() prima.');
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}
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const page = await this.browser.newPage();
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const maxTentativi = 3;
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try {
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console.log(`caricamento pagina: ${url}`);
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await page.goto(url, { waitUntil: 'networkidle0' });
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await page.waitForNavigation({ waitUntil: 'networkidle0' }).catch(() => {});
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page.on('console', (msg) => {
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if (msg.type() === 'error') {
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console.error('Errore nella pagina:', msg.text());
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}
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});
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await tools.attendiNSecondi(6);
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let success = false;
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let numTentativi1 = 0;
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console.log(`Cerco .pdf-section...`);
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while (numTentativi1 < maxTentativi) {
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try {
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await page.waitForSelector('.pdf-section', { timeout: 10000 });
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console.log(` .pdf-section trovato !...`);
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success = true;
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break;
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} catch (e) {
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console.log(`Tentativo ${numTentativi1 + 1}/${maxTentativi} fallito, ASPETTO DI PIU 10 secondi`);
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await tools.attendiNSecondi(10);
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}
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numTentativi1++;
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}
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await this.autoScroll(page);
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await tools.attendiNSecondi(5);
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// Seleziona tutte le sezioni da stampare
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let sectionHandles = await page.$$('.pdf-section');
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let numTentativi = 0;
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while (sectionHandles.length === 0 && numTentativi < maxTentativi) {
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console.log(
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`Nessuna sezione .pdf-section trovata nella pagina, quindi ASPETTO DI PIU ${numTentativi + 1}/${maxTentativi}`
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);
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await tools.attendiNSecondi(5);
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sectionHandles = await page.$$('.pdf-section');
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numTentativi++;
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}
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if (sectionHandles.length === 0) {
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throw new Error(`Nessuna sezione .pdf-section trovata nella pagina dopo ${maxTentativi} tentativi`);
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}
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const pdfBuffers = [];
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for (const sectionHandle of sectionHandles) {
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// Nascondi tutte le sezioni
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await page.evaluate(() => {
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document.querySelectorAll('.pdf-section').forEach((el) => (el.style.display = 'none'));
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});
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// Mostra solo la sezione corrente
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await sectionHandle.evaluate((el) => (el.style.display = 'block'));
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// Calcola dimensioni della sezione
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const { width, height } = await sectionHandle.evaluate((el) => ({
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width: el.scrollWidth, // piccolo padding
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height: el.scrollHeight, // piccolo padding
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}));
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// console.log(`Larghezza: ${width}px, Altezza: ${height}px`);
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// Imposta viewport dinamico
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await page.setViewport({ width, height });
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// Genera pdf buffer per questa pagina
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const pdfBuffer = await page.pdf({
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printBackground: true,
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width: `${width}px`,
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height: `${height}px`,
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margin: { top: '0', bottom: '0', left: '0', right: '0' },
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});
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pdfBuffers.push(pdfBuffer);
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}
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// Unisci tutti i PDF
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const mergedPdf = await PDFDocument.create();
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for (const pdfBytes of pdfBuffers) {
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const pdf = await PDFDocument.load(pdfBytes);
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const copiedPages = await mergedPdf.copyPages(pdf, pdf.getPageIndices());
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copiedPages.forEach((page) => mergedPdf.addPage(page));
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}
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const mergedPdfFile = await mergedPdf.save();
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const finalFilePath = path.resolve(process.cwd(), filenameOut);
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await fs.writeFile(finalFilePath, mergedPdfFile);
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// Ripristina tutte le sezioni visibili
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await page.evaluate(() => {
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document.querySelectorAll('.pdf-section').forEach((el) => (el.style.display = 'block'));
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});
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console.log(`PDF finale generato: ${finalFilePath}`);
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return finalFilePath;
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} catch (error) {
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console.error('Errore durante generazione PDF:', error);
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throw error;
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} finally {
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await page.close();
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}
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}
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async convertPDF_ChildProcess(inputFile, outputFile, widthpx, heightpx, compressionLevel = 'screen') {
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const { spawn } = require('child_process');
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const path = require('path');
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widthpx = widthpx * 2;
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heightpx = heightpx * 2;
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console.log('=== CONVERSIONE CON CHILD_PROCESS E COMPRESSIONE ===');
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// Verifica input
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if (!(await tools.isFileExistsAsync(inputFile))) {
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throw new Error(`File input non trovato: ${inputFile}`);
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}
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// Assicurati che la directory output esista
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const outputDir = path.dirname(outputFile);
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const fs = require('fs').promises;
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try {
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await fs.mkdir(outputDir, { recursive: true });
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} catch (error) {
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// Directory già esistente, ok
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}
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// Parametri di compressione ottimizzati
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const compressionSettings = {
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/*maximum: [
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'-dPDFSETTINGS=/screen',
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'-dDownsampleColorImages=true',
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'-dColorImageResolution=72',
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'-dDownsampleGrayImages=true',
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'-dGrayImageResolution=72',
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'-dDownsampleMonoImages=true',
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'-dMonoImageResolution=72',
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],
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high: [
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'-dPDFSETTINGS=/ebook',
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'-dDownsampleColorImages=true',
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'-dColorImageResolution=150',
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'-dDownsampleGrayImages=true',
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'-dGrayImageResolution=150',
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],*/
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printer: ['-dPDFSETTINGS=/printer', '-dDownsampleColorImages=true', '-dColorImageResolution=300'],
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screen: [
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'-dPDFSETTINGS=/screen',
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'-dDownsampleColorImages=true',
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'-dColorImageResolution=96',
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'-dDownsampleGrayImages=true',
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'-dGrayImageResolution=96',
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],
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};
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return new Promise((resolve, reject) => {
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const args = [
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'-sDEVICE=pdfwrite',
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'-dCompatibilityLevel=1.4',
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'-dNOPAUSE',
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'-dQUIET',
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'-dBATCH',
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'-dSAFER',
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// Parametri di compressione
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...(compressionSettings[compressionLevel] || compressionSettings['screen']),
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'-dCompressFonts=true',
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'-dSubsetFonts=true',
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'-dColorImageFilter=/DCTEncode',
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'-dGrayImageFilter=/DCTEncode',
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'-dEmbedAllFonts=true',
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// Dimensioni pagina
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`-g${widthpx}x${heightpx}`,
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'-dFIXEDMEDIA',
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// '-dPDFFitPage',
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// Output
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`-sOutputFile=${outputFile}`,
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inputFile,
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];
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console.log('Spawning gs with compression args:', args.join(' '));
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const gsProcess = spawn('gs', args, {
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stdio: ['ignore', 'pipe', 'pipe'],
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shell: process.platform === 'win32',
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});
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let stdout = '';
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let stderr = '';
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gsProcess.stdout.on('data', (data) => {
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stdout += data.toString();
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if (stdout.length < 1000) {
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// Evita log troppo lunghi
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console.log('GS OUT:', data.toString().trim());
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}
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});
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gsProcess.stderr.on('data', (data) => {
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stderr += data.toString();
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if (stderr.length < 1000) {
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console.log('GS ERR:', data.toString().trim());
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}
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});
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gsProcess.on('close', async (code) => {
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console.log(`GS process closed with code: ${code}`);
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if (code === 0) {
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// Attendi e verifica
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setTimeout(async () => {
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try {
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const exists = await tools.isFileExistsAsync(outputFile);
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if (exists) {
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// Verifica dimensioni per confermare compressione
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try {
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const originalStats = await tools.getFileStatsAsync(inputFile);
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const newStats = await tools.getFileStatsAsync(outputFile);
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const compressionRatio = (((originalStats.size - newStats.size) / originalStats.size) * 100).toFixed(
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1
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);
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console.log(`📁 File originale: ${(originalStats.size / 1024 / 1024).toFixed(2)} MB`);
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console.log(`📁 File compresso: ${(newStats.size / 1024 / 1024).toFixed(2)} MB`);
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console.log(`🗜️ Compressione: ${compressionRatio}%`);
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console.log('✅ SUCCESS: File generato e compresso');
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} catch (statsError) {
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console.log('Warning: impossibile calcolare statistiche compressione');
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}
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resolve(outputFile);
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} else {
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console.log('❌ FAIL: File non generato nonostante exit code 0');
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reject(new Error('File non generato nonostante successo processo'));
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}
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} catch (error) {
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reject(error);
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}
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}, 1000);
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} else {
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reject(new Error(`Ghostscript failed with code ${code}: ${stderr}`));
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}
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});
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gsProcess.on('error', (error) => {
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console.log('GS process error:', error);
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reject(new Error(`Failed to start Ghostscript: ${error.message}`));
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});
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});
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}
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async generatePdfFromUrls(urls, outputFilename) {
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if (!this.browser) {
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throw new Error('Browser non avviato. Chiama launch() prima.');
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}
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const pdfBuffers = [];
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outputFilename = tools.getdirByIdApp(idapp) + '/';
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try {
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for (const url of urls) {
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// ............
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}
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const mergedPdf = await PDFDocument.create();
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for (const pdfBytes of pdfBuffers) {
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const pdf = await PDFDocument.load(pdfBytes);
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const copiedPages = await mergedPdf.copyPages(pdf, pdf.getPageIndices());
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copiedPages.forEach((page) => mergedPdf.addPage(page));
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}
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const mergedPdfFile = await mergedPdf.save();
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const outputPath = path.resolve(process.cwd(), outputFilename);
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await fs.writeFile(outputPath, mergedPdfFile);
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console.log(`PDF unito generato: ${outputPath}`);
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return outputPath;
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} catch (error) {
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console.error('Errore durante la generazione PDF:', error);
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throw error;
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}
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}
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async getPathByPage(idpage) {
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const mypage = await MyPage.findById(idpage);
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if (mypage) {
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return mypage.path;
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}
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return '';
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}
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async generatePdfFromIdCatalog(options) {
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try {
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if (!options) {
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console.error('Opzioni non passate !');
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return null;
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}
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let filenamerelative = '';
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let fullnamepath = '';
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let fullnamepath_compr = '';
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let filenamerelative_compressed = '';
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let stampa = options.stampa;
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/*if (stampa) {
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options.width = '227.3mm';
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options.height = '313.5mm';
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} else {
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options.width = '210mm';
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options.height = '297mm';
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}*/
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const catalog = await Catalog.findById(options.idCatalog);
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if (catalog) {
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const url =
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tools.getHostByIdApp(this.idapp) +
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'/cataloghi?id=' +
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catalog._id +
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'&stampa=' +
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(stampa ? '1' : '0') +
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'&hideHeader=1';
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if (url) {
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const myfilenameout = await this.getPathByPage(catalog.idPageAssigned);
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let addstr = stampa ? '_stampabile' : '';
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filenamerelative = options.path + `${myfilenameout}${addstr}_generato.pdf`;
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fullnamepath = tools.getdirByIdApp(this.idapp) + '/' + filenamerelative;
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await this.generatePdfFromUrl(url, fullnamepath, options);
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if (options.comprimi) {
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filenamerelative_compressed = options.path + `${myfilenameout}${addstr}_generato_compressed.pdf`;
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fullnamepath_compr = tools.getdirByIdApp(this.idapp) + '/' + filenamerelative_compressed;
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await this.compressPdf(fullnamepath, fullnamepath_compr, options.compressione);
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}
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}
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}
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return {
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fileout: filenamerelative,
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fileout_compressed: filenamerelative_compressed,
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filesize: await tools.getSizeFile(fullnamepath),
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filesize_compressed: await tools.getSizeFile(fullnamepath_compr),
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error: '',
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};
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} catch (error) {
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console.error('Errore durante la generazione del PDF dal catalogo ID:', error);
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return {
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fileout: '',
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filesize: 0,
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error: 'Errore durante la generazione del PDF dal catalogo ID:' + error?.message,
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};
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}
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return { fileout: '', filesize: 0, error: '' };
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}
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async compressPdf(inputPath, outputPath, compressione = 'printer') {
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return new Promise((resolve, reject) => {
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// Risolvi i percorsi assoluti
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const inputFile = path.resolve(inputPath);
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const outputFile = path.resolve(outputPath);
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const validQualities = ['screen', 'ebook', 'printer', 'prepress', 'default'];
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if (!validQualities.includes(compressione)) compressione = 'screen';
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// Comando Ghostscript per compressione - impostazione per web (/screen)
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const gsCommand = `gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/${compressione} -dNOPAUSE -dBATCH -dQUIET -sOutputFile="${outputFile}" "${inputFile}"`;
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console.log('Eseguo comando:', gsCommand);
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exec(gsCommand, (error, stdout, stderr) => {
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if (error) {
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console.error(`Errore compressione PDF: ${error.message}`);
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return reject(error);
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}
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if (stderr) {
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console.error(`Ghostscript stderr: ${stderr}`);
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}
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console.log(`Compressione completata. File salvato in: ${outputFile}`);
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resolve(outputFile);
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});
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});
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}
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}
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module.exports = GenPdf;
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