Register a middleware for specific service in V5

[barbeblanche96]

How can I register a middleware for specific service like with v4.

  app.use('/download-service', new DownloadService(options, app), function(req, res) {
      console.log(res.data);
      const file = fs.readFileSync('./public/'+res.data.path, 'utf8');
      res.type(res.data.type);
      res.end(file);
    });

I want to reproduce this with koa in V5, ie register a middleware before and after a specific service not globally like explain in documentation.

[daffl]

Whoops I forgot to add this to the docs (now documented here. It is possible to pass a koa.before option with custom service middleware when registering the service:

app.use('/todos', new TodoService(), {
  koa: {
    before: [
      async (ctx, next) => {
        ctx.feathers // data that will be merged into sevice `params`

        // This will run all subsequent middleware and the service call
        await next()

        // Then we have additional properties available on the context
        ctx.hook // the hook context from the method call
        ctx.body // the return value
      }
    ]
  }
})

[SYBIOTE]

can i register an after service middleware as well?

[daffl]

A Koa middleware does both, before and after. You can do things before and after await next() as in the comment above. Express middleware registration is documented in https://feathersjs.com/api/express.html#custom-service-middleware

[SYBIOTE]

I want to do it with a service object

Is this syntax valid ?

async function redirect(ctx, next){}

app.use(path, new service(), {koa:{after:[redirect]}})

Edit :
from what your saying , i just need to call redirect after the next() call?

[daffl]

An easier way for redirects is setting

context.http = {
  ...context.http,
  redirect: 'location'
}

In a hook. Also see https://feathersjs.com/api/hooks.html#context-http

[SYBIOTE]

hey thanks a lot, I looked into the code base and "after" service middle ware were defined so I used those