103 lines
3.5 KiB
Swift
103 lines
3.5 KiB
Swift
// ===----------------------------------------------------------------------===
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//
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// This source file is part of the Hummingbird DocC open source project
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//
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// Copyright (c) 2025 Röck+Cöde VoF. and the Hummingbird DocC project authors
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// Licensed under Apache license v2.0
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//
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// See LICENSE for license information
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// See CONTRIBUTORS for the list of Hummingbird DocC project authors
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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// ===----------------------------------------------------------------------===
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import protocol Hummingbird.FileProvider
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import struct Hummingbird.Response
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import struct Logging.Logger
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/// A use case that serves a resource, defined by its URI path, from a physical location.
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struct ServeURIUseCase<Provider: FileProvider> {
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// MARK: Properties
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/// A type that conforms to a protocol that defines file system interactions.
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private let fileProvider: Provider
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/// A type that interacts with the logging system.
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private let logger: Logger
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// MARK: Initializers
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/// Initializes this use case.
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/// - Parameters:
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/// - fileProvider: A type that conforms to a protocol that defines file system interactions.
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/// - logger: A type that interacts with the logging system.
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init(
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fileProvider: Provider,
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logger: Logger
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) {
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self.fileProvider = fileProvider
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self.logger = logger
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}
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// MARK: Functions
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/// Serves a certain resource based on a given URI path from a physical location.
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/// - Parameters:
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/// - uriPath: A URI path that represents a resource to be served.
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/// - folderPath: A URI path to a physical folder that contains the resource.
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/// - contextualInfo: A pseudo-type that contains data about a request and its related context.
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/// - Returns: A response that either contains the data of the resource in its body in case the resource is found, or a not found otherwise.
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/// - Throws: An error in case an issue is encountered while serving the resource.
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func callAsFunction(
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_ uriPath: String,
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at folderPath: String,
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with contextualInfo: ContextualInfo
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) async throws -> Response {
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let filePath = folderPath + uriPath
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guard let fileIdentifier = fileProvider.getFileIdentifier(filePath) else {
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defer {
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logger.log(
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level: .error,
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"The resource \(filePath) has not been found.",
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metadata: .metadata(
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context: contextualInfo.context,
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request: contextualInfo.request,
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statusCode: .notFound
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),
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source: .Logging.source
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)
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}
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return .init(status: .notFound)
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}
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let body = try await fileProvider.loadFile(
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id: fileIdentifier,
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context: contextualInfo.context
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)
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defer {
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logger.log(
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level: .debug,
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"The body of the resource \(filePath) has \(body.contentLength ?? 0) bytes.",
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metadata: .metadata(
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context: contextualInfo.context,
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request: contextualInfo.request,
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statusCode: .ok
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),
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source: .Logging.source
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)
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}
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return .init(
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status: .ok,
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body: body
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)
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}
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}
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