59 lines
1.9 KiB
Swift
59 lines
1.9 KiB
Swift
//
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// ImageService.swift
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// LuminateCore
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//
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// Created by Brendan Szymanski on 6/5/26.
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//
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import Foundation
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#if canImport(FoundationNetworking)
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import FoundationNetworking
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#endif
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public actor ImageService {
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private let cacheDir: URL
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private let memoryCache = NSCache<NSString, NSData>()
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public init(cacheDir: URL? = nil) {
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let defaultCache = FileManager.default.urls(
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for: .cachesDirectory, in: .userDomainMask
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).first!.appendingPathComponent("luminate/images")
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self.cacheDir = cacheDir ?? defaultCache
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try? FileManager.default.createDirectory(
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at: self.cacheDir, withIntermediateDirectories: true)
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}
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public func loadImage(url: URL) async throws -> Data {
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let key = url.absoluteString as NSString
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if let cached = memoryCache.object(forKey: key) {
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return cached as Data
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}
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let diskKey = url.absoluteString.data(using: .utf8)!.base64EncodedString()
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.replacingOccurrences(of: "/", with: "_")
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let diskURL = cacheDir.appendingPathComponent(diskKey)
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if let data = try? Data(contentsOf: diskURL) {
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memoryCache.setObject(data as NSData, forKey: key)
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return data
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}
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let (data, _) = try await URLSession.shared.data(from: url)
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let nsData = data as NSData
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memoryCache.setObject(nsData, forKey: key)
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try? data.write(to: diskURL)
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return data
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}
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public func prefetch(urls: [URL]) async {
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await withTaskGroup(of: Void.self) { group in
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for url in urls {
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group.addTask { _ = try? await self.loadImage(url: url) }
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}
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}
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}
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public func clearCache() {
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memoryCache.removeAllObjects()
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try? FileManager.default.removeItem(at: cacheDir)
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try? FileManager.default.createDirectory(at: cacheDir, withIntermediateDirectories: true)
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}
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}
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