pdf2html-jk-temporary/postinstall.js

PDF to HTML or Text conversion using Apache Tika. Also generate PDF thumbnail using Apache PDFBox.

const https = require("https");
const fs = require("fs");
const constants = require("./constants");

const dependencies = {
  [constants.VENDOR_PDF_BOX_JAR]:
    "https://dlcdn.apache.org/pdfbox/2.0.26/pdfbox-app-2.0.26.jar",
  [constants.VENDOR_TIKA_JAR]:
    "https://dlcdn.apache.org/tika/2.4.0/tika-app-2.4.0.jar",
};

const download = (filename) => {
  const filePath = constants.DIRECTORY.VENDOR + filename;
  fs.access(filePath, fs.constants.F_OK, (err) => {
    if (err) {
      console.log(`Started downloading dependency ${filename}.`);
      const request = https.get(dependencies[filename], (response) => {
        if (response.statusCode === 200) {
          const fileStream = fs.createWriteStream(filePath);
          response.pipe(fileStream);
          fileStream.addListener("finish", () => {
            console.log(`Finished downloading dependency ${filename}.`);
          });
        } else {
          throw new Error(`Failed downloading dependency ${filename}.`);
        }
      });
      request.on("error", () => {
        throw new Error(`Failed downloading dependency ${filename}.`);
      });
    }
  });
};

const filenames = Object.keys(dependencies);
filenames.forEach((filename) => {
  download(filename);
});