Route schema validation

[Pietrohl]

Checklist

• [x] I have ensured my pull request is not behind the main or master branch of the original repository.
• [x] I have rebased all commits where necessary so that reviewing this pull request can be done without having to merge it first.
• [x] I have written a commit message that passes commitlint linting.
• [x] I have ensured that my code changes pass linting tests.
• [x] I have ensured that my code changes pass unit tests.
• [x] I have described my pull request and the reasons for code changes along with context if necessary.

Validation Schema to routes verb methods

This PR is to resolve the issue 170 for a possible new feature, to add a function overload to route[verb] function so it can accept a schema validation as second parameter.

Example usage:

    const app = new Koa();
    const router = new Router();

    const schema = {
      type: 'object',
      properties: {
        x: { type: 'integer' }
      },
      required: ['x'],
      additionalProperties: false
    };

    router.post('/user', { body: schema }, function (ctx, next) {
      ctx.status = 201;
      ctx.body = { message: 'User added!' };
      }
    );

[socket-security[bot]]

New dependencies detected. Learn more about Socket for GitHub ↗︎

Packages	Version	New capabilities	Transitives	Size	Publisher
@koa/bodyparser	5.0.0	None	+7	473 kB	fengmk2

[3imed-jaberi]

@Pietrohl Thanks for your proposal, I think currently we are on the rethinking step about the router, and for sure this feature will be one of the points on our list. Maybe add your implementation as module to be a recipe under the recipes section on README.md can be a great option, like multi-verbs module here.

All what you need after publishing the small validation module, open issue and notify me.

In the meanwhile, If you really want the validation feature, I recommend you to use @koa-better-modules/joi-router which is the up to date version of koa-joi-router.