initial commit

ios_client/EncryptedChat/Models/Conversation.swift

@@ -0,0 +1,46 @@
+import Foundation
+
+struct Conversation: Identifiable, Equatable {
+    let id: String
+    var name: String?
+    var members: [ConversationMember]
+    var createdBy: String?
+    var avatarFile: String?
+    var unreadCount: Int
+    var isFavorite: Bool
+    var lastMessageTime: Date?
+
+    var isGroup: Bool {
+        name != nil || members.count > 2
+    }
+
+    /// Display name: group name, or DM partner username
+    func displayName(currentUserId: String) -> String {
+        if let name = name, !name.isEmpty {
+            return name
+        }
+        // DM: show the other person's name
+        if let other = members.first(where: { $0.userId != currentUserId }) {
+            return other.username
+        }
+        return "Unknown"
+    }
+
+    /// DM partner user ID (nil for groups)
+    func dmPartnerId(currentUserId: String) -> String? {
+        guard !isGroup else { return nil }
+        return members.first(where: { $0.userId != currentUserId })?.userId
+    }
+
+    static func == (lhs: Conversation, rhs: Conversation) -> Bool {
+        lhs.id == rhs.id
+    }
+}
+
+struct ConversationMember: Identifiable, Equatable, Codable {
+    let userId: String
+    var username: String
+    var email: String
+
+    var id: String { userId }
+}

ios_client/EncryptedChat/Models/DeviceBundle.swift

@@ -0,0 +1,43 @@
+import Foundation
+
+/// Key bundle for one device, used in X3DH
+struct DeviceBundle {
+    let deviceId: String
+    let identityKey: Data      // Ed25519 public key (32 bytes)
+    let spk: Data              // X25519 public key (32 bytes)
+    let spkSignature: Data     // Ed25519 signature (64 bytes)
+    let spkId: String
+    let opk: Data?             // X25519 public key (32 bytes), optional
+    let opkId: String?
+
+    /// Parse from server response dictionary
+    static func fromDict(_ dict: [String: Any]) throws -> DeviceBundle {
+        guard let deviceId = dict["device_id"] as? String,
+              let ikHex = dict["identity_key"] as? String,
+              let ik = Data(hexString: ikHex),
+              let spkHex = dict["spk"] as? String,
+              let spk = Data(hexString: spkHex),
+              let spkSigHex = dict["spk_signature"] as? String,
+              let spkSig = Data(hexString: spkSigHex),
+              let spkId = dict["spk_id"] as? String else {
+            throw ChatError.invalidData("Invalid device bundle")
+        }
+
+        var opk: Data?
+        var opkId: String?
+        if let opkHex = dict["opk"] as? String, let opkData = Data(hexString: opkHex) {
+            opk = opkData
+            opkId = dict["opk_id"] as? String
+        }
+
+        return DeviceBundle(
+            deviceId: deviceId,
+            identityKey: ik,
+            spk: spk,
+            spkSignature: spkSig,
+            spkId: spkId,
+            opk: opk,
+            opkId: opkId
+        )
+    }
+}

ios_client/EncryptedChat/Models/Invitation.swift

@@ -0,0 +1,9 @@
+import Foundation
+
+struct Invitation: Identifiable {
+    let id: String              // invitation id (from server) or conversationId
+    let conversationId: String
+    let conversationName: String
+    let invitedBy: String
+    let invitedByUsername: String
+}

ios_client/EncryptedChat/Models/Message.swift

@@ -0,0 +1,33 @@
+import Foundation
+
+struct Message: Identifiable, Equatable {
+    let id: String
+    let conversationId: String
+    let senderId: String
+    var senderUsername: String
+    let createdAt: Date
+    var text: String?
+    var replyTo: String?
+    var imageFileId: String?
+    var file: FileInfo?
+    var isDeleted: Bool
+    var readBy: Set<String>
+
+    /// Whether this is a self-sent message
+    func isMine(currentUserId: String) -> Bool {
+        senderId == currentUserId
+    }
+
+    static func == (lhs: Message, rhs: Message) -> Bool {
+        lhs.id == rhs.id
+    }
+}
+
+struct FileInfo: Equatable, Codable {
+    let fileId: String
+    let aesKey: String   // hex
+    let iv: String       // hex
+    let filename: String
+    let size: Int
+    let mimeType: String
+}

ios_client/EncryptedChat/Models/User.swift

@@ -0,0 +1,19 @@
+import Foundation
+
+struct User: Identifiable, Equatable {
+    let id: String
+    var username: String
+    var email: String
+    var identityKey: Data?  // Ed25519 public key (32 bytes)
+}
+
+struct UserProfile: Equatable {
+    var userId: String
+    var username: String?
+    var email: String?
+    var phone: String?
+    var phoneVisible: Bool
+    var location: String?
+    var locationVisible: Bool
+    var avatarFile: String?
+}