2024-06-07 11:41:02 +08:00

122 lines
5.0 KiB
Swift

//
// Resource.swift
// Kingfisher
//
// Created by Wei Wang on 15/4/6.
//
// Copyright (c) 2019 Wei Wang <onevcat@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
import Foundation
/// Represents an image resource at a certain url and a given cache key.
/// Kingfisher will use a `Resource` to download a resource from network and cache it with the cache key when
/// using `Source.network` as its image setting source.
public protocol Resource {
/// The key used in cache.
var cacheKey: String { get }
/// The target image URL.
var downloadURL: URL { get }
}
extension Resource {
/// Converts `self` to a valid `Source` based on its `downloadURL` scheme. A `.provider` with
/// `LocalFileImageDataProvider` associated will be returned if the URL points to a local file. Otherwise,
/// `.network` is returned.
public func convertToSource(overrideCacheKey: String? = nil) -> Source {
let key = overrideCacheKey ?? cacheKey
return downloadURL.isFileURL ?
.provider(LocalFileImageDataProvider(fileURL: downloadURL, cacheKey: key)) :
.network(KF.ImageResource(downloadURL: downloadURL, cacheKey: key))
}
}
@available(*, deprecated, message: "This type conflicts with `GeneratedAssetSymbols.ImageResource` in Swift 5.9. Renamed to avoid issues in the future.", renamed: "KF.ImageResource")
public typealias ImageResource = KF.ImageResource
extension KF {
/// ImageResource is a simple combination of `downloadURL` and `cacheKey`.
/// When passed to image view set methods, Kingfisher will try to download the target
/// image from the `downloadURL`, and then store it with the `cacheKey` as the key in cache.
public struct ImageResource: Resource {
// MARK: - Initializers
/// Creates an image resource.
///
/// - Parameters:
/// - downloadURL: The target image URL from where the image can be downloaded.
/// - cacheKey: The cache key. If `nil`, Kingfisher will use the `absoluteString` of `downloadURL` as the key.
/// Default is `nil`.
public init(downloadURL: URL, cacheKey: String? = nil) {
self.downloadURL = downloadURL
self.cacheKey = cacheKey ?? downloadURL.cacheKey
}
// MARK: Protocol Conforming
/// The key used in cache.
public let cacheKey: String
/// The target image URL.
public let downloadURL: URL
}
}
/// URL conforms to `Resource` in Kingfisher.
/// The `absoluteString` of this URL is used as `cacheKey`. And the URL itself will be used as `downloadURL`.
/// If you need customize the url and/or cache key, use `ImageResource` instead.
extension URL: Resource {
public var cacheKey: String { return isFileURL ? localFileCacheKey : absoluteString }
public var downloadURL: URL { return self }
}
extension URL {
static let localFileCacheKeyPrefix = "kingfisher.local.cacheKey"
// The special version of cache key for a local file on disk. Every time the app is reinstalled on the disk,
// the system assigns a new container folder to hold the .app (and the extensions, .appex) folder. So the URL for
// the same image in bundle might be different.
//
// This getter only uses the fixed part in the URL (until the bundle name folder) to provide a stable cache key
// for the image under the same path inside the bundle.
//
// See #1825 (https://github.com/onevcat/Kingfisher/issues/1825)
var localFileCacheKey: String {
var validComponents: [String] = []
for part in pathComponents.reversed() {
validComponents.append(part)
if part.hasSuffix(".app") || part.hasSuffix(".appex") {
break
}
}
let fixedPath = "\(Self.localFileCacheKeyPrefix)/\(validComponents.reversed().joined(separator: "/"))"
if let q = query {
return "\(fixedPath)?\(q)"
} else {
return fixedPath
}
}
}