0.10.6

Sources/Shared/Persistence/AvatarCache.swift

@@ -0,0 +1,38 @@
+import Foundation
+
+actor AvatarCache {
+    private let directory: URL
+
+    init() {
+        let fileManager = FileManager.default
+        let base = fileManager.urls(for: .cachesDirectory, in: .userDomainMask).first
+            ?? fileManager.temporaryDirectory
+        directory = base.appendingPathComponent("Luma/Avatars", isDirectory: true)
+        try? fileManager.createDirectory(at: directory, withIntermediateDirectories: true)
+    }
+
+    func data(for jid: String) -> Data? {
+        try? Data(contentsOf: fileURL(for: jid))
+    }
+
+    func store(_ data: Data, for jid: String) throws {
+        try data.write(to: fileURL(for: jid), options: [.atomic])
+#if os(iOS)
+        try? FileManager.default.setAttributes(
+            [.protectionKey: FileProtectionType.completeUntilFirstUserAuthentication],
+            ofItemAtPath: fileURL(for: jid).path
+        )
+#endif
+    }
+
+    private func fileURL(for jid: String) -> URL {
+        directory.appendingPathComponent("\(Self.stableHash(jid)).avatar")
+    }
+
+    private static func stableHash(_ value: String) -> String {
+        let hash = value.lowercased().utf8.reduce(UInt64(14_695_981_039_346_656_037)) { partial, byte in
+            (partial ^ UInt64(byte)) &* 1_099_511_628_211
+        }
+        return String(hash, radix: 16, uppercase: false)
+    }
+}