76 lines
2.7 KiB
Swift
76 lines
2.7 KiB
Swift
import Elementary
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import Foundation
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import HTTPTypes
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import Hummingbird
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import Localization
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/// A per-language collection of pre-rendered HTML responses.
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///
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/// At initialization it renders the document once for each language the bundle's ``LanguageList`` reports and caches the bytes, mirroring
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/// ``CachedHTMLResponse``'s render-once model but keyed by language. Each cached response carries a `Content-Language` header and
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/// `Vary: Accept-Language`, so shared caches key on the negotiated language instead of serving one language to everyone.
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public struct LocalizedHTMLCollectionResponse: Sendable {
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// MARK: Properties
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/// The supported languages and default language, derived from the bundle's String Catalog.
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private let list: LanguageList
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/// The pre-rendered responses, keyed by language identifier.
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private let responses: [String: CachedHTMLResponse]
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// MARK: Initializers
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/// Renders the document once per supported language.
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/// - Parameters:
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/// - bundle: the bundle whose String Catalog names the languages the document is rendered for.
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/// - status: the status applied to every response. Defaults to `.ok`.
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/// - document: builds the document to render for a given locale.
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public init<Document: HTMLDocument>(
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bundle: Bundle,
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status: HTTPResponse.Status = .ok,
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document: (Locale) -> Document
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) {
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self.list = .init(bundle: bundle)
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self.responses = list.all
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.reduce(into: [:]) { responses, language in
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responses[language] = CachedHTMLResponse(
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status: status,
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additionalHeaders: [
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.contentLanguage: language,
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.vary: "Accept-Language",
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],
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document: document(.init(
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identifier: language
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))
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)
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}
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}
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// MARK: Methods
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/// Builds the response for the given language, falling back to the default language.
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/// - Parameters:
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/// - language: the negotiated language identifier.
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/// - request: the request the response answers, consulted for conditional revalidation.
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/// - Returns: the cached response for the language, the default language's response when the language is unavailable, or a
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/// `500 Internal Server Error` if neither is cached.
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public func response(
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for language: String,
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request: Request
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) -> Response {
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guard
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let response = responses[language] ?? responses[list.default]
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else {
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return .init(
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status: .internalServerError
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)
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}
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return response.response(
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for: request
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)
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}
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}
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