feat: authorize iOS Hermes accounts and secure session isolation

Sources/Networking/AuthClient.swift

@@ -0,0 +1,77 @@
+import Foundation
+
+struct AuthUser: Codable, Equatable {
+    let id: String
+    let username: String
+    let displayName: String?
+    let role: String
+    let status: String
+    enum CodingKeys: String, CodingKey {
+        case id, username, role, status
+        case displayName = "display_name"
+    }
+}
+struct AuthLoginResponse: Decodable {
+    let token: String
+    let user: AuthUser
+    let expiresAt: Double
+    enum CodingKeys: String, CodingKey {
+        case token, user
+        case expiresAt = "expires_at"
+    }
+    init(from decoder: Decoder) throws {
+        let c = try decoder.container(keyedBy: CodingKeys.self)
+        token = try c.decode(String.self, forKey: .token)
+        user = try c.decode(AuthUser.self, forKey: .user)
+        if let seconds = try? c.decode(Double.self, forKey: .expiresAt) { expiresAt = seconds }
+        else {
+            let raw = try c.decode(String.self, forKey: .expiresAt)
+            guard let date = ISO8601DateFormatter().date(from: raw) else { throw AuthError.invalidResponse }
+            expiresAt = date.timeIntervalSince1970
+        }
+    }
+
+}
+enum AuthError: LocalizedError {
+    case status(Int)
+    case invalidResponse
+    var errorDescription: String? {
+        switch self {
+        case .status(401): return "Your sign-in expired or the username and password were not accepted. Sign in again."
+        case .status(403): return "This account is not authorized. Contact your server administrator."
+        case .status: return "The server could not complete sign-in. Try again later."
+        case .invalidResponse: return "The server returned an unexpected authentication response."
+        }
+    }
+}
+final class AuthClient {
+    let config: ServerConfig
+    private let session: URLSession
+    init(config: ServerConfig, session: URLSession? = nil) {
+        self.config = config
+        self.session = session ?? TLSPinning.session()
+    }
+    private func request(_ path: String, method: String, token: String? = nil, body: Data? = nil) async throws -> Data {
+        var request = URLRequest(url: config.baseURL.appendingPathComponent(path))
+        request.httpMethod = method
+        request.timeoutInterval = 10
+        request.httpBody = body
+        if body != nil { request.setValue("application/json", forHTTPHeaderField: "Content-Type") }
+        if let token { request.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization") }
+        let (data, response) = try await session.data(for: request)
+        guard let http = response as? HTTPURLResponse else { throw AuthError.invalidResponse }
+        guard (200..<300).contains(http.statusCode) else { throw AuthError.status(http.statusCode) }
+        return data
+    }
+    func login(username: String, password: String) async throws -> AuthLoginResponse {
+        let body = try JSONSerialization.data(withJSONObject: ["username": username, "password": password])
+        return try JSONDecoder().decode(AuthLoginResponse.self, from: await request("api/auth/login", method: "POST", body: body))
+    }
+    func me(token: String) async throws -> AuthUser {
+        struct Response: Decodable { let user: AuthUser }
+        return try JSONDecoder().decode(Response.self, from: await request("api/auth/me", method: "GET", token: token)).user
+    }
+    func logout(token: String) async throws {
+        _ = try await request("api/auth/logout", method: "POST", token: token)
+    }
+}