feat: open-source 小浣熊阅读 for iOS

Sources/LegadoCore/Persistence/BookSourceRepository.swift

@@ -0,0 +1,46 @@
+import Foundation
+
+public protocol BookSourceRepository: Sendable {
+    func load() async throws -> [BookSource]
+    func save(_ sources: [BookSource]) async throws
+}
+
+public actor FileBookSourceRepository: BookSourceRepository {
+    private let fileURL: URL
+    private let encoder: JSONEncoder
+    private let decoder: JSONDecoder
+
+    public init(fileURL: URL) {
+        self.fileURL = fileURL
+        encoder = JSONEncoder()
+        encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
+        decoder = JSONDecoder()
+    }
+
+    public func load() throws -> [BookSource] {
+        guard FileManager.default.fileExists(atPath: fileURL.path) else { return [] }
+        return try decoder.decode([BookSource].self, from: Data(contentsOf: fileURL))
+    }
+
+    public func save(_ sources: [BookSource]) throws {
+        let directory = fileURL.deletingLastPathComponent()
+        try FileManager.default.createDirectory(at: directory, withIntermediateDirectories: true)
+        let data = try encoder.encode(sources)
+        try data.write(to: fileURL, options: .atomic)
+    }
+}
+
+public actor InMemoryBookSourceRepository: BookSourceRepository {
+    private var sources: [BookSource]
+
+    public init(sources: [BookSource] = []) {
+        self.sources = sources
+    }
+
+    public func load() -> [BookSource] { sources }
+
+    public func save(_ sources: [BookSource]) {
+        self.sources = sources
+    }
+}
+