Swiftpack.co - Package - mpclarkson/vapor-demo-provider

Example Vapor Provider

Great web frameworks make it simple to develop third party plugins that can be easily added to any project.

The Vapor Swift web framework is no exception and allows developers to create and share plugins called Providers

This example demonstrates how to create a Vapor Provider with functionality that would be required by real Providers, such as Admin backends, Debug toolbars and Job Queue management, including:

  • Default configuration with optional overrides using json
  • Example Route that returns a view using the Leaf Swift templating language.
  • Example Middleware.

The purpose of this repo is simply is to provide some guidance on how to build Providers that extend Vapor's core functionality.

Adding the Example Provider

To add this example provider to a Vapor project include it as a dependency in your Packages.swift file.

let package = Package(
    name: "MyApp",
    dependencies: [
   	    .Package(url: "https://github.com/vapor/vapor.git", majorVersion: 1),
        .Package(url: "https://github.com/mpclarkson/vapor-demo-provider.git", majorVersion: 1),
    ]
)

Then enable the provider in main.swift:

import Vapor
import VaporDemoProvider

let drop = Droplet(providers: [
     VaporDemoProvider.Provider.self
  ]
)

drop.run()

Then run vapor build && vapor run and visit http://127.0.0.1:8080/_demo to see the providers welcome page.

Configuration Example

This provider includes a basic view that is available at /_demo.

This route can be overridden by simply adding a demo_provider.json file in the Config folder of a Vapor project, which contains a path key, as follows:

{
  "path": "/mypath",
}

Then run vapor build && vapor run and visit http://127.0.0.1:8080/mypath to see the HTML page.

Middleware Example

This demo provider also includes middleware that simply adds a header DemoProvider: Installed to all responses.

Currently it does not seem possible for a provider to enable middleware automatically - you must do this manually.

//Other config

let drop = Droplet(
  availableMiddleware: [
    "demoprovider" : VaporDemoProvider.Middleware()
  ],
  providers: [
    VaporDemoProvider.Provider.self
  ]
)

drop.run()

Then enable the middleware in your Config/middleware.json file:

{
    "server": [
        ...
        "demoprovider"
    ],
    ...
}

Then run vapor build && vapor run.

Thoughts

While building this demo, a few things came to mind that could help make it easier for the community to build Providers.

  • The Vapor toolkit could be extended to allow the creation of skeletons, for example vapor generate provider
  • Currently middleware can only be initialized in the Droplet and is a let constant. This means that third party middleware cannot be added when the providers are initialized. It would be nice to be able to do something like drop.middleware.append(["demoprovider" : DemoProvider.Middleware()])
  • Many third party packages in popular frameworks include routes and views. I may have missed something, but the only way I can see how a Provider can (easily) return views is to copy the Provider views into the drop.resourcesDir. Perhaps Providers could have a default resource dir of their own, which could be overridden on init to allow custom templates to be used in there place?

Next Steps

Creating a Vapor Provider is pretty straightforward and the core team deserves kudos for making this so simple at this early stage in the framework's development.

Now, let's build a vibrant Vapor community by crafting some truly useful Providers.

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