60 lines
2.0 KiB
Swift
60 lines
2.0 KiB
Swift
import Foundation
|
|
import HTTPTypes
|
|
import Hummingbird
|
|
import Localization
|
|
|
|
/// Resolves the visitor's preferred language and records it on the request context.
|
|
///
|
|
/// Placed ahead of the localized responders in the middleware chain, it reads the request's `Accept-Language` header, negotiates the best supported
|
|
/// match (falling back to the default language), and stores it on the context's ``LocalizedRequestContext/language``.
|
|
///
|
|
/// The request is otherwise passed through untouched — the URL and routing are not affected — so each page is served at its existing path and varies its
|
|
/// content by header.
|
|
public struct LocalizationMiddleware<Context: LocalizedRequestContext> {
|
|
|
|
// MARK: Properties
|
|
|
|
/// Negotiates the request's language from its `Accept-Language` header.
|
|
private let negotiate: Negotiate
|
|
|
|
// MARK: Initializers
|
|
|
|
/// Creates a localization middleware that negotiates against the given bundle's String Catalog languages.
|
|
/// - Parameter bundle: the bundle whose String Catalog names the supported languages.
|
|
public init(
|
|
bundle: Bundle
|
|
) {
|
|
self.negotiate = .init(bundle: bundle)
|
|
}
|
|
|
|
}
|
|
|
|
// MARK: - RouterMiddleware
|
|
|
|
extension LocalizationMiddleware: RouterMiddleware {
|
|
|
|
// MARK: Functions
|
|
|
|
/// Negotiates the request's language and records it on the context before passing it down.
|
|
/// - Parameters:
|
|
/// - request: the incoming request.
|
|
/// - context: the context the request is resolved against.
|
|
/// - next: the next responder in the middleware chain.
|
|
/// - Returns: the downstream response.
|
|
/// - Throws: any error thrown downstream.
|
|
public func handle(
|
|
_ request: Request,
|
|
context: Context,
|
|
next: (Request, Context) async throws -> Response
|
|
) async throws -> Response {
|
|
var context = context
|
|
|
|
context.language = negotiate(
|
|
acceptLanguage: request.headers[.acceptLanguage]
|
|
)
|
|
|
|
return try await next(request, context)
|
|
}
|
|
|
|
}
|