Support multipart form data

[goodexpert]

See #1873

Checklist

• npm test passes on your machine
• New tests added or existing tests modified to cover all changes
• Code conforms with the style guide
• API Documentation in code was updated
• Documentation in /docs/site was updated
• Affected artifact templates in packages/cli were updated
• Affected example projects in examples/* were updated

[bajtos]

Hi @goodexpert, thank you for the contribution, this is a great start! IIUC, you are building on top of #1838, thus we will need to land that pull request first, right?

Please sign our Contributor License Agreement, we cannot accept your contribution without that. See https://cla.strongloop.com/agreements/strongloop/loopback-next

Secondly, we will need you to add automated tests to cover your new feature. I would like to see at least one acceptance test showing how to write a controller method accepting file uploads.

Last but not least, the Travis CI build is failing in code-lint and commit-lint steps. You can fix most linting errors by running npm run lint:fix. To change the commit message, run git rebase -i master, select reword action for the commits needed changes and after the rebase is done, rewrite the history on GitHub by running git push --force-with-lease.

I highly recommend you to read our DEVELOPING guide to better understand our conventions.

[bajtos]

☝️

[goodexpert]

I have fixed some of issue and added an unit testing of multipart/form-data

[bajtos]

@goodexpert thank you for the updates. As I see it, adding support for file uploads is a big feature that will live with us for many months or years and will be difficult to significantly change. I'd like us to carefully design this figure in a way that will be robust, secure and extensible to support future needs. Let's discuss these high-level topics in #1873 first please, before looking at implementation details.

[kawasaki23Ven]

Is this available?

[goodexpert]

Is this available?

Yes, I have applied this to my project to upload files with form data.

[goodexpert]

Please check my new pull request.

[bajtos]

Closing in favor of #1989