Correios PLP to PDF stream

PoC to write a PLP to PDF stream using NodeJS 14+.

Running locally

npm i
npm start

Access localhost:8081/docs to access swagger and test the PLP request. Make sure you click in the Authorize button and add the following token to test (generated using jsonwebtoken library via the jwt.sign method):

eyJhbGciOiJIUzI1NiJ9.NjcwNmUxNjAtMmIzZi00ZGRkLTkwNTktMDhlZjFlYWUxOTJh.POLvSQbpwpuwkvOXBRi1LeQQOkSYEkpPogwOLl7AU5E

Considerations

1. We're using KoaJS to enable the routes for testing, but you can use Express or whatever backend NodeJS framework for such purpose. Logging is being handled by Bunyan.

2. Swagger and schema docs are totally separated. In case you modify something on the schema docs, make sure you change that as well on Swagger, otherwise the docs and the schemas will be out-of-sync.

3. For validation purposes, we're using Ajv altogether with schema-json. Make sure you access their docs or the code in here to understand how it works.

4. For hierarchical configuration, we're using config. We still need to generate the environment variables from them, so that we can customize them at OS level (not only at the app level, but one can just create a dev.js file and call the npm start with a NODE_ENV=dev environment variable).

5. For authentication simplicity, we didn't implement a signin path and made one token for test based on the config.jwt object declarated at the config/ folder. Therefore, one must use the token declared above to test the available endpoints.

6. For PDF generation, we're declaring the document using EJS with HTML and puppeteer to generate the PDF using Chrome/Chromium over the DevTools protocol (headless browser).

7. Generation was based on the PHP Sigep repository tool that generates not only posting pre-lists (aka PLPs) but also shipping labels (aka Etiquetas). There is still ground to cover, such as generating PDF shipping labels on NodeJS and HTML templates (TBD).

8. Testing, linting and any transpilation is pending. Feel free to contribute adding some Jest fixtures for this repo :)

9. Templating isn't really the best yet, there are some improvements to be made. Open for suggestions.