url 2 pdf support, update test run, reduse imge size,
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205
libs/html-templates-lib.ts
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205
libs/html-templates-lib.ts
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import express from "express"
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export const htmlTemplateRoute = express.Router()
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import { mimeToExtension, templateOption } from "./report-template"
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// import fs from "fs"
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//import { chromium } from 'playwright'
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import puppeteer,{PDFOptions} from 'puppeteer'
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import Handlebars from 'handlebars'
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import e from "express"
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//import { createReport } from "docx-templates"
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// แก้ package.json ของ LibreOfficeFileConverter
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// https://github.com/microsoft/TypeScript/issues/52363#issuecomment-1659179354
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//import { LibreOfficeFileConverter } from "libreoffice-file-converter"
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const TEMPLATE_FOLDER_NAME = "templates/html"
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const width_px = 1200; //TODO read from htmlOption
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/**
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* docxTemplate Uses docx-template to convert input data and template to output buffer.
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* SPA and lazy load page may not fully render(eg. pantip.com).
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* You have to handle exception throw by function
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* handlebars template support only content from Buffer
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* @param {Buffer|String} t template in buffer format or url to web page
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* @param {templateOption} tdata Template Information in JSON format
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* @param {String} outputMediaType output extension, support pdf, jpeg, png
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* @return {Promise<Uint8Array>} output buffer after apply template.
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*/
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export async function htmlTemplateX(t: Buffer | String, tdata: templateOption, outputMediaType: string = "pdf"): Promise<Uint8Array> {
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try {
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if (!["pdf", "jpeg", "png"].find((e) => e === outputMediaType)) {
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throw "FormatError"
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}
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const browser = await puppeteer.launch({ headless: true,args: ['--no-sandbox'] });
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const page = await browser.newPage();
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page.setDefaultNavigationTimeout(120000);
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await page.setViewport({
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width: width_px,
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height: 800,
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deviceScaleFactor: 2,
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isMobile: false
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});
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if (typeof t === 'string') {
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await page.goto(t, { waitUntil: 'networkidle0' });
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} else {
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if (tdata.data) {
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const template = Handlebars.compile(t.toString());
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const html = template(tdata.data);
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await page.setContent(html);
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} else {
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await page.setContent(t.toString())
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}
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}
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/*
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// try to load whole page
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let x = await page.evaluate(async (tdata) => {
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const scrollableSection =
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(tdata.htmlOption?.querySelector && document.querySelector(tdata.htmlOption.querySelector)) ?
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document.querySelector(tdata.htmlOption.querySelector) : document.body
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if (scrollableSection) {
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const childElement = scrollableSection.firstElementChild;
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let scrollPosition = 0;
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let viewportHeight = window.innerHeight;
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if (childElement)
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while (scrollPosition < childElement.scrollHeight) {
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scrollableSection.scrollBy(0, viewportHeight);
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await new Promise(resolve => setTimeout(resolve, 500));
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scrollPosition += viewportHeight;
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}
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return scrollPosition
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}
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return 0
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}, tdata);
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//console.log("scrollPosition=" + x)
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*/
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//find real page height
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const totalHeight = await page.evaluate(async (tdata) => {
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let scrollableSection =
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(tdata.htmlOption?.querySelector &&
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document.querySelector(tdata.htmlOption.querySelector) && document.querySelector(tdata.htmlOption.querySelector)) ?
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document.querySelector(tdata.htmlOption.querySelector) : null
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const childElement = scrollableSection? scrollableSection: document.body
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if(scrollableSection ==null)
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scrollableSection = document.body
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//const childElement = scrollableSection.firstElementChild;
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let scrollPosition = 0;
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let viewportHeight = window.innerHeight;
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while (scrollPosition < childElement.scrollHeight) {
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scrollableSection.scrollBy(0, viewportHeight);
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await new Promise(resolve => setTimeout(resolve, 500));
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scrollPosition += viewportHeight;
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}
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return childElement.scrollHeight
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}, tdata);
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if (!totalHeight) {
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throw new Error(`Unable to determine the page height ${totalHeight}. The selector may not correct or no body tag`);
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} else {
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console.log("Page height adjusted to:", totalHeight);
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}
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console.log("set viewport ")
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await page.setViewport({
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width: width_px,
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height: totalHeight,
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deviceScaleFactor: 2,
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isMobile: false
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});
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///// output to photo end here
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if (outputMediaType === "png" || outputMediaType === "jpeg") {
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const photoBuffer = await page.screenshot({
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// path: 'url_pup.png',
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fullPage: true,
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type: outputMediaType // 'webp'
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})
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await browser.close();
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return photoBuffer
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}
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///// output to PDF
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//TODO overide option from htmlTemplateOption
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let pdfOption:PDFOptions = {
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// path: './url_prop.pdf',
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// format:"A4",
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width: width_px,
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height: totalHeight,
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printBackground: true,
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scale: 1,
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displayHeaderFooter: false,
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margin: { top: 5, right: 5, bottom: 5, left: 5 }
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}
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const buffer = await page.pdf(pdfOption);
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await browser.close();
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return buffer
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} catch (e) {
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//console.log(e)
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throw e
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}
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}
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/** javascript-obfuscator:disable
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* @swagger
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* /api/v1/report-template/html:
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* post:
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* summary: แปลหน้าเวปไปเป็น pdf , png, jpeg (ฟีเจอร์ html template ด้วย handlebars ยังไม่เสร็จ) ค่า template เป็น url ของหน้าเวปที่ต้องการ, reportName เป็นชื่อไฟล์ที่ต้องการ
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* tags: [report-template]
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* requestBody:
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* required: true
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* content:
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* application/json:
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* schema:
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* $ref: '#/components/schemas/templateOption'
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* example:
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* template: https://bma-dashboard.frappet.synology.me/d/ANtkJay4z/4Lic4Li54LmJ4Lie4Li04LiB4Liy4Lij?orgId=1&kiosk
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* reportName: html-report
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* htmlOption: {"querySelector": ".scrollbar-view"}
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* responses:
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* 201:
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* description: เอกสารถูกสร้างขึ้น
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* content:
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* application/pdf:
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* schema:
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* type: string
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* format: binary
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* image/png:
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* schema:
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* type: string
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* format: binary
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* image/jpeg:
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* schema:
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* type: string
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* format: binary
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* 400:
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* description: format error
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* 500:
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* description: Server error
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*
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*/
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htmlTemplateRoute.post("/", async function (req, res) {
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try {
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if (!req.headers["content-type"] || !req.headers["accept"]) throw new Error("Require header content-type, accept")
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let inputType = mimeToExtension(req.headers["content-type"])// application/json
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let outputMediaType = mimeToExtension(req.headers["accept"])
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let buffer = await htmlTemplateX(req.body.template, req.body, outputMediaType)
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res.statusCode = 201
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res.setHeader("Content-Type", req.headers["accept"])
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res.setHeader("Content-Disposition", `attachment;filename=${req.body.reportName}.${outputMediaType}`)
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res.setHeader("Content-Length", buffer.length)
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res.end(buffer)
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} catch (ex) {
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if(ex instanceof SyntaxError){
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res.statusCode = 400
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res.statusMessage = ex.message
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res.end(res.statusMessage)
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console.error("report-template/html: ", ex)
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}else{
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res.statusCode = 500
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res.statusMessage = "Internal Server Error during POST report-template/html"
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res.end(res.statusMessage)
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console.error("report-template/html: ", ex)
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}
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}
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})
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