Implemented the ArchiveController controller in the library target.

Library/Sources/Internal/Controllers/ArchiveController.swift

@@ -1,11 +1,33 @@
 import Hummingbird
 
+/// A controller that handles
 struct ArchiveController<Context: RequestContext> {
     
+    // MARK: Properties
+    
+    private let fileService: any FileServicing
+    private let folderArchives: String
+
+    // MARK: Initialisers
+    
+    /// Initialises this controller.
+    /// - Parameters:
+    ///   - folderArchives: <#folderArchives description#>
+    ///   - fileService: <#fileService description#>
+    init(
+        _ folderArchives: String,
+        fileService: any FileServicing = FileService()
+    ) {
+        self.folderArchives = folderArchives
+        self.fileService = fileService
+    }
+    
     // MARK: Functions
     
+    /// Registers the controller to a given router.
+    /// - Parameter router: A router to register this controller to.
     func register(to router: Router<Context>) {
-        router.get("archives", use: listAllArchives)
+        router.get(.archives, use: listAllArchives)
     }
     
 }
@@ -19,8 +41,25 @@ private extension ArchiveController {
     @Sendable func listAllArchives(
         _ request: Request,
         context: Context
-    ) async throws -> HTTPResponse.Status {
-        .ok
+    ) async throws -> ArchiveList {
+        let archives = try await fileService
+            .listItems(in: folderArchives)
+            .filter { $0.hasSuffix(.suffixArchive) }
+            .sorted { $0 < $1 }
+
+        return .init(archives)
     }
     
 }
+
+// MARK: - RouterPath+Constants
+
+private extension RouterPath {
+    static let archives: RouterPath = .init("archives")
+}
+
+// MARK: - String+Constants
+
+private extension String {
+    static let suffixArchive: String = ".doccarchive"
+}