Initial commit.

2026-08-19 23:19:08 +02:00
commit 22e737d9c2
153 changed files with 11680 additions and 0 deletions
@@ -0,0 +1,75 @@
+import Elementary
+import Foundation
+import HTTPTypes
+import Hummingbird
+import Localization
+
+/// A per-language collection of pre-rendered HTML responses.
+///
+/// At initialization it renders the document once for each language the bundle's ``LanguageList`` reports and caches the bytes, mirroring
+/// ``CachedHTMLResponse``'s render-once model but keyed by language. Each cached response carries a `Content-Language` header and
+/// `Vary: Accept-Language`, so shared caches key on the negotiated language instead of serving one language to everyone.
+public struct LocalizedHTMLCollectionResponse: Sendable {
+
+    // MARK: Properties
+
+    /// The supported languages and default language, derived from the bundle's String Catalog.
+    private let list: LanguageList
+
+    /// The pre-rendered responses, keyed by language identifier.
+    private let responses: [String: CachedHTMLResponse]
+
+    // MARK: Initializers
+
+    /// Renders the document once per supported language.
+    /// - Parameters:
+    ///   - bundle: the bundle whose String Catalog names the languages the document is rendered for.
+    ///   - status: the status applied to every response. Defaults to `.ok`.
+    ///   - document: builds the document to render for a given locale.
+    public init<Document: HTMLDocument>(
+        bundle: Bundle,
+        status: HTTPResponse.Status = .ok,
+        document: (Locale) -> Document
+    ) {
+        self.list = .init(bundle: bundle)
+        self.responses = list.all
+            .reduce(into: [:]) { responses, language in
+                responses[language] = CachedHTMLResponse(
+                    status: status,
+                    additionalHeaders: [
+                        .contentLanguage: language,
+                        .vary: "Accept-Language",
+                    ],
+                    document: document(.init(
+                        identifier: language
+                    ))
+                )
+            }
+    }
+
+    // MARK: Methods
+
+    /// Builds the response for the given language, falling back to the default language.
+    /// - Parameters:
+    ///   - language: the negotiated language identifier.
+    ///   - request: the request the response answers, consulted for conditional revalidation.
+    /// - Returns: the cached response for the language, the default language's response when the language is unavailable, or a
+    ///   `500 Internal Server Error` if neither is cached.
+    public func response(
+        for language: String,
+        request: Request
+    ) -> Response {
+        guard
+            let response = responses[language] ?? responses[list.default]
+        else {
+            return .init(
+                status: .internalServerError
+            )
+        }
+
+        return response.response(
+            for: request
+        )
+    }
+
+}