Postinstall script to inject cacert.pem into Tinify dependency

Inject cacertpem into Tinify.md

When our team tried to use tinify into a AWS Lambda function using Typescript the file node_modules/tinify/lib/data/cacert.pem wasn't copied properly so the transpiled code could not find it and Tinify would fail.

Thanks to @shannonhochkins and his postinstall idea to inject the value of cacert.pem into Client.js.

How to setup this script

1. Create a scripts/ folder on your project.
2. Create a file called tinify-inject-cacertpem.js inside the scripts/ folder.
3. Copy the contents from the file of this gist.
4. Add a postinstall script into your package.json

{
  "scripts": {
    "postinstall": "node ./scripts/tinify-inject-cacertpem.js"
  }
}

With this script the cacert.pem will be injected into tinify/Client.js and it will not have issues when transpiting with Typescript.

tinify-inject-cacertpem.js

const fs = require('fs');
const path = require('path');

// Check if node_modules exists
if (!fs.existsSync('node_modules')) {
    console.error('node_modules does not exist');
    process.exit(1);
}

// Check if tinify dependency exists
if (!fs.existsSync('node_modules/tinify')) {
    console.error('tinify does not exist');
    process.exit(1);
}

// Check if tinify/lib/data/cacert.pem exists
const certPath = 'node_modules/tinify/lib/data/cacert.pem';
if (!fs.existsSync(certPath)) {
    console.error('cacert.pem does not exist');
    process.exit(1);
}

// Check if tinify/lib/tinify/Client.js exists
const clientPath = 'node_modules/tinify/lib/tinify/Client.js';
if (!fs.existsSync(clientPath)) {
    console.error('Client.js does not exist');
    process.exit(1);
}

// Load cacert.pem into a string value
const certData = fs.readFileSync(certPath, 'utf8');

// Replace the line: const data = fs.readFileSync(`${__dirname}/../data/cacert.pem`).toString();
// with the cacert.pem string value
let clientData = fs.readFileSync(clientPath, 'utf8');
clientData = clientData.replace(/const data = fs\.readFileSync\(`\$\{__dirname\}\/\.\.\/data\/cacert\.pem`\)\.toString\(\);/g, `const data = \`${certData}\`;`);

// Save the file
fs.writeFileSync(clientPath, clientData);

console.log('Tinify transformed successfully! cacert.pem injected into Client.js');

Thank you for sharing it👍

This is a quick "optimization" by GitHub Copilot.

const fs = require('fs');
const path = require('path');

const NODE_MODULES = 'node_modules';
const TINIFY_PATH = path.join(NODE_MODULES, 'tinify');
const CERT_PATH = path.join(TINIFY_PATH, 'lib/data/cacert.pem');
const CLIENT_PATH = path.join(TINIFY_PATH, 'lib/tinify/Client.js');

function checkExistence(filePath, errorMessage) {
  if (!fs.existsSync(filePath)) {
    console.error(errorMessage);
    process.exit(1);
  }
}

// Check if necessary paths exist
checkExistence(NODE_MODULES, 'node_modules does not exist');
checkExistence(TINIFY_PATH, 'tinify does not exist');
checkExistence(CERT_PATH, 'cacert.pem does not exist');
checkExistence(CLIENT_PATH, 'Client.js does not exist');

// Load cacert.pem into a string value
const certData = fs.readFileSync(CERT_PATH, 'utf8');

// Replace the line: const data = fs.readFileSync(`${__dirname}/../data/cacert.pem`).toString();
// with the cacert.pem string value
let clientData = fs.readFileSync(CLIENT_PATH, 'utf8');
clientData = clientData.replace(
  /const data = fs\.readFileSync\(`\$\{__dirname\}\/\.\.\/data\/cacert\.pem`\)\.toString\(\);/g,
  `const data = \`${certData}\`;`
);

// Save the modified Client.js
fs.writeFileSync(CLIENT_PATH, clientData);

console.log(
  'Tinify transformed successfully! cacert.pem injected into Client.js'
);