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simplex-chat/apps/ios/spec/state.md
spaced4ndy 0946f50b6a ios: product specification (#6633)
2026-02-19 10:58:16 +00:00

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# SimpleX Chat iOS -- State Management
**Source:** [`ChatModel.swift`](../Shared/Model/ChatModel.swift#L1-L1375) | [`ChatTypes.swift`](../SimpleXChat/ChatTypes.swift#L1-L5284)
> Technical specification for the app's state architecture: ChatModel, ItemsModel, Chat, ChatInfo, and preference storage.
>
> Related specs: [Architecture](architecture.md) | [API Reference](api.md) | [README](README.md)
> Related product: [Concept Index](../product/concepts.md)
---
## Table of Contents
1. [Overview](#1-overview)
2. [ChatModel -- Primary App State](#2-chatmodel)
3. [ItemsModel -- Per-Chat Message State](#3-itemsmodel)
4. [ChatTagsModel -- Tag Filtering State](#4-chattagsmodel)
5. [Chat -- Single Conversation State](#5-chat)
6. [ChatInfo -- Conversation Metadata](#6-chatinfo)
7. [State Flow](#7-state-flow)
8. [Preference Storage](#8-preference-storage)
---
## 1. Overview
The app uses SwiftUI's `ObservableObject` pattern for reactive state management. The state hierarchy is:
```
ChatModel (singleton -- global app state)
├── currentUser: User?
├── users: [UserInfo]
├── chats: [Chat] (chat list)
├── chatId: String? (active chat ID)
├── im: ItemsModel.shared (primary chat items)
├── secondaryIM: ItemsModel? (secondary chat items, e.g. support scope)
├── activeCall: Call?
├── callInvitations: [ChatId: RcvCallInvitation]
├── deviceToken / savedToken / tokenStatus
├── notificationMode: NotificationsMode
├── onboardingStage: OnboardingStage?
├── migrationState: MigrationToState?
└── ... (50+ @Published properties)
ItemsModel (singleton + secondary instances -- per-chat message state)
├── reversedChatItems: [ChatItem] (messages in reverse order)
├── chatState: ActiveChatState (pagination/split state)
├── isLoading / showLoadingProgress
└── preloadState: PreloadState
Chat (per-conversation -- one per entry in chat list)
├── chatInfo: ChatInfo (type + metadata)
├── chatItems: [ChatItem] (preview items)
└── chatStats: ChatStats (unread counts)
ChatTagsModel (singleton -- filter state)
├── userTags: [ChatTag]
├── activeFilter: ActiveFilter?
├── presetTags: [PresetTag: Int]
└── unreadTags: [Int64: Int]
```
---
## 2. [ChatModel](../Shared/Model/ChatModel.swift#L337-L1260)
**Class**: `final class ChatModel: ObservableObject`
**Singleton**: `ChatModel.shared`
**Source**: [`Shared/Model/ChatModel.swift`](../Shared/Model/ChatModel.swift#L337)
### Key Published Properties
#### App Lifecycle
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `onboardingStage` | `OnboardingStage?` | Current onboarding step | [L331](../Shared/Model/ChatModel.swift#L338) |
| `chatInitialized` | `Bool` | Whether chat has been initialized | [L340](../Shared/Model/ChatModel.swift#L347) |
| `chatRunning` | `Bool?` | Whether chat engine is running | [L341](../Shared/Model/ChatModel.swift#L348) |
| `chatDbChanged` | `Bool` | Whether DB was changed externally | [L342](../Shared/Model/ChatModel.swift#L349) |
| `chatDbEncrypted` | `Bool?` | Whether DB is encrypted | [L343](../Shared/Model/ChatModel.swift#L350) |
| `chatDbStatus` | `DBMigrationResult?` | DB migration status | [L344](../Shared/Model/ChatModel.swift#L351) |
| `ctrlInitInProgress` | `Bool` | Whether controller is initializing | [L345](../Shared/Model/ChatModel.swift#L352) |
| `migrationState` | `MigrationToState?` | Device migration state | [L390](../Shared/Model/ChatModel.swift#L398) |
#### User State
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `currentUser` | `User?` | Active user profile (triggers theme reapply on change) | [L334](../Shared/Model/ChatModel.swift#L341) |
| `users` | `[UserInfo]` | All user profiles | [L339](../Shared/Model/ChatModel.swift#L346) |
| `v3DBMigration` | `V3DBMigrationState` | Legacy DB migration state | [L333](../Shared/Model/ChatModel.swift#L340) |
#### Chat List
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `chats` | `[Chat]` (private set) | All conversations for current user | [L351](../Shared/Model/ChatModel.swift#L358) |
| `deletedChats` | `Set<String>` | Chat IDs pending deletion animation | [L352](../Shared/Model/ChatModel.swift#L359) |
#### Active Chat
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `chatId` | `String?` | Currently open chat ID | [L354](../Shared/Model/ChatModel.swift#L361) |
| `chatAgentConnId` | `String?` | Agent connection ID for active chat | [L355](../Shared/Model/ChatModel.swift#L362) |
| `chatSubStatus` | `SubscriptionStatus?` | Active chat subscription status | [L356](../Shared/Model/ChatModel.swift#L363) |
| `openAroundItemId` | `ChatItem.ID?` | Item to scroll to when opening | [L357](../Shared/Model/ChatModel.swift#L364) |
| `chatToTop` | `String?` | Chat to scroll to top | [L358](../Shared/Model/ChatModel.swift#L365) |
| `groupMembers` | `[GMember]` | Members of active group | [L359](../Shared/Model/ChatModel.swift#L366) |
| `groupMembersIndexes` | `[Int64: Int]` | Member ID to index mapping | [L360](../Shared/Model/ChatModel.swift#L367) |
| `membersLoaded` | `Bool` | Whether members have been loaded | [L361](../Shared/Model/ChatModel.swift#L368) |
| `secondaryIM` | `ItemsModel?` | Secondary items model (e.g. support chat scope) | [L408](../Shared/Model/ChatModel.swift#L416) |
#### Authentication
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `contentViewAccessAuthenticated` | `Bool` | Whether user has passed authentication | [L348](../Shared/Model/ChatModel.swift#L355) |
| `laRequest` | `LocalAuthRequest?` | Pending authentication request | [L349](../Shared/Model/ChatModel.swift#L356) |
#### Notifications
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `deviceToken` | `DeviceToken?` | Current APNs device token | [L369](../Shared/Model/ChatModel.swift#L376) |
| `savedToken` | `DeviceToken?` | Previously saved token | [L370](../Shared/Model/ChatModel.swift#L377) |
| `tokenRegistered` | `Bool` | Whether token is registered with server | [L371](../Shared/Model/ChatModel.swift#L378) |
| `tokenStatus` | `NtfTknStatus?` | Token registration status | [L373](../Shared/Model/ChatModel.swift#L380) |
| `notificationMode` | `NotificationsMode` | Current notification mode (.off/.periodic/.instant) | [L374](../Shared/Model/ChatModel.swift#L381) |
| `notificationServer` | `String?` | Notification server URL | [L375](../Shared/Model/ChatModel.swift#L382) |
| `notificationPreview` | `NotificationPreviewMode` | What to show in notifications | [L376](../Shared/Model/ChatModel.swift#L383) |
| `notificationResponse` | `UNNotificationResponse?` | Pending notification action | [L346](../Shared/Model/ChatModel.swift#L353) |
| `ntfContactRequest` | `NTFContactRequest?` | Pending contact request from notification | [L378](../Shared/Model/ChatModel.swift#L385) |
| `ntfCallInvitationAction` | `(ChatId, NtfCallAction)?` | Pending call action from notification | [L379](../Shared/Model/ChatModel.swift#L386) |
#### Calls
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `callInvitations` | `[ChatId: RcvCallInvitation]` | Pending incoming call invitations | [L381](../Shared/Model/ChatModel.swift#L388) |
| `activeCall` | `Call?` | Currently active call | [L382](../Shared/Model/ChatModel.swift#L389) |
| `callCommand` | `WebRTCCommandProcessor` | WebRTC command queue | [L383](../Shared/Model/ChatModel.swift#L390) |
| `showCallView` | `Bool` | Whether to show full-screen call UI | [L384](../Shared/Model/ChatModel.swift#L391) |
| `activeCallViewIsCollapsed` | `Bool` | Whether call view is in PiP mode | [L385](../Shared/Model/ChatModel.swift#L392) |
#### Remote Desktop
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `remoteCtrlSession` | `RemoteCtrlSession?` | Active remote desktop session | [L387](../Shared/Model/ChatModel.swift#L395) |
#### Misc
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `userAddress` | `UserContactLink?` | User's SimpleX address | [L365](../Shared/Model/ChatModel.swift#L372) |
| `chatItemTTL` | `ChatItemTTL` | Global message TTL | [L366](../Shared/Model/ChatModel.swift#L373) |
| `appOpenUrl` | `URL?` | URL opened while app active | [L367](../Shared/Model/ChatModel.swift#L374) |
| `appOpenUrlLater` | `URL?` | URL opened while app inactive | [L368](../Shared/Model/ChatModel.swift#L375) |
| `showingInvitation` | `ShowingInvitation?` | Currently displayed invitation | [L389](../Shared/Model/ChatModel.swift#L397) |
| `draft` | `ComposeState?` | Saved compose draft | [L393](../Shared/Model/ChatModel.swift#L401) |
| `draftChatId` | `String?` | Chat ID for saved draft | [L394](../Shared/Model/ChatModel.swift#L402) |
| `networkInfo` | `UserNetworkInfo` | Current network type and status | [L395](../Shared/Model/ChatModel.swift#L403) |
| `conditions` | `ServerOperatorConditions` | Server usage conditions | [L397](../Shared/Model/ChatModel.swift#L405) |
| `stopPreviousRecPlay` | `URL?` | Currently playing audio source | [L392](../Shared/Model/ChatModel.swift#L400) |
### Non-Published Properties
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `messageDelivery` | `[Int64: () -> Void]` | Pending delivery confirmation callbacks | [L399](../Shared/Model/ChatModel.swift#L407) |
| `filesToDelete` | `Set<URL>` | Files queued for deletion | [L401](../Shared/Model/ChatModel.swift#L409) |
| `im` | `ItemsModel` | Reference to `ItemsModel.shared` | [L405](../Shared/Model/ChatModel.swift#L413) |
### Key Methods
| Method | Description | Line |
|--------|-------------|------|
| `getUser(_ userId:)` | Find user by ID | [L427](../Shared/Model/ChatModel.swift#L436) |
| `updateUser(_ user:)` | Update user in list and current | [L437](../Shared/Model/ChatModel.swift#L447) |
| `removeUser(_ user:)` | Remove user from list | [L446](../Shared/Model/ChatModel.swift#L457) |
| `getChat(_ id:)` | Find chat by ID | [L456](../Shared/Model/ChatModel.swift#L468) |
| `addChat(_ chat:)` | Add chat to list | [L510](../Shared/Model/ChatModel.swift#L523) |
| `updateChatInfo(_ cInfo:)` | Update chat metadata | [L523](../Shared/Model/ChatModel.swift#L537) |
| `replaceChat(_ id:, _ chat:)` | Replace chat in list | [L574](../Shared/Model/ChatModel.swift#L589) |
| `removeChat(_ id:)` | Remove chat from list | [L1180](../Shared/Model/ChatModel.swift#L1198) |
| `popChat(_ id:, _ ts:)` | Move chat to top of list | [L1157](../Shared/Model/ChatModel.swift#L1174) |
| `totalUnreadCountForAllUsers()` | Sum unread across all users | [L1058](../Shared/Model/ChatModel.swift#L1074) |
---
## 3. [ItemsModel](../Shared/Model/ChatModel.swift#L74-L174)
**Class**: `class ItemsModel: ObservableObject`
**Primary singleton**: `ItemsModel.shared`
**Secondary instances**: Created via `ItemsModel.loadSecondaryChat()` for scope-based views (e.g., group member support chat)
**Source**: [`Shared/Model/ChatModel.swift`](../Shared/Model/ChatModel.swift#L74)
### Properties
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `reversedChatItems` | `[ChatItem]` | Messages in reverse chronological order (newest first) | [L78](../Shared/Model/ChatModel.swift#L80) |
| `itemAdded` | `Bool` | Flag indicating a new item was added | [L81](../Shared/Model/ChatModel.swift#L83) |
| `chatState` | `ActiveChatState` | Pagination splits and loaded ranges | [L85](../Shared/Model/ChatModel.swift#L87) |
| `isLoading` | `Bool` | Whether messages are currently loading | [L89](../Shared/Model/ChatModel.swift#L91) |
| `showLoadingProgress` | `ChatId?` | Chat ID showing loading spinner | [L90](../Shared/Model/ChatModel.swift#L92) |
| `preloadState` | `PreloadState` | State for infinite-scroll preloading | [L75](../Shared/Model/ChatModel.swift#L77) |
| `secondaryIMFilter` | `SecondaryItemsModelFilter?` | Filter for secondary instances | [L74](../Shared/Model/ChatModel.swift#L76) |
### Computed Properties
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `lastItemsLoaded` | `Bool` | Whether the oldest messages have been loaded | [L95](../Shared/Model/ChatModel.swift#L97) |
| `contentTag` | `MsgContentTag?` | Content type filter (if secondary) | [L154](../Shared/Model/ChatModel.swift#L159) |
| `groupScopeInfo` | `GroupChatScopeInfo?` | Group scope filter (if secondary) | [L162](../Shared/Model/ChatModel.swift#L167) |
### Throttling
`ItemsModel` uses a custom publisher throttle (0.2 seconds) to batch rapid updates to `reversedChatItems` and prevent excessive SwiftUI re-renders:
```swift
publisher
.throttle(for: 0.2, scheduler: DispatchQueue.main, latest: true)
.sink { self.objectWillChange.send() }
.store(in: &bag)
```
Direct `@Published` properties (`isLoading`, `showLoadingProgress`) bypass throttling for immediate UI response.
### Key Methods
| Method | Description | Line |
|--------|-------------|------|
| `loadOpenChat(_ chatId:)` | Load chat with 250ms navigation delay | [L113](../Shared/Model/ChatModel.swift#L117) |
| `loadOpenChatNoWait(_ chatId:, _ openAroundItemId:)` | Load chat without delay | [L138](../Shared/Model/ChatModel.swift#L143) |
| `loadSecondaryChat(_ chatId:, chatFilter:)` | Create secondary ItemsModel instance | [L107](../Shared/Model/ChatModel.swift#L110) |
### [SecondaryItemsModelFilter](../Shared/Model/ChatModel.swift#L58-L70)
Used for secondary chat views (e.g., group member support scope, content type filter):
```swift
enum SecondaryItemsModelFilter {
case groupChatScopeContext(groupScopeInfo: GroupChatScopeInfo)
case msgContentTagContext(contentTag: MsgContentTag)
}
```
---
## 4. [ChatTagsModel](../Shared/Model/ChatModel.swift#L189-L291)
**Class**: `class ChatTagsModel: ObservableObject`
**Singleton**: `ChatTagsModel.shared`
**Source**: [`Shared/Model/ChatModel.swift`](../Shared/Model/ChatModel.swift#L189)
### Properties
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `userTags` | `[ChatTag]` | User-defined tags | [L186](../Shared/Model/ChatModel.swift#L192) |
| `activeFilter` | `ActiveFilter?` | Currently active filter tab | [L187](../Shared/Model/ChatModel.swift#L193) |
| `presetTags` | `[PresetTag: Int]` | Preset tag counts (groups, contacts, favorites, etc.) | [L188](../Shared/Model/ChatModel.swift#L194) |
| `unreadTags` | `[Int64: Int]` | Unread count per user tag | [L189](../Shared/Model/ChatModel.swift#L195) |
### [ActiveFilter](../Shared/Views/ChatList/ChatListView.swift#L52)
```swift
enum ActiveFilter {
case presetTag(PresetTag) // .favorites, .contacts, .groups, .business, .groupReports
case userTag(ChatTag) // User-defined tag
case unread // Unread conversations
}
```
---
## 5. [Chat](../Shared/Model/ChatModel.swift#L1311-L1323)
**Class**: `final class Chat: ObservableObject, Identifiable, ChatLike`
**Source**: [`Shared/Model/ChatModel.swift`](../Shared/Model/ChatModel.swift#L1271)
Represents a single conversation in the chat list. Each `Chat` is an independent observable object.
### Properties
| Property | Type | Description | Line |
|----------|------|-------------|------|
| `chatInfo` | `ChatInfo` | Conversation type and metadata | [L1253](../Shared/Model/ChatModel.swift#L1272) |
| `chatItems` | `[ChatItem]` | Preview items (typically last message) | [L1254](../Shared/Model/ChatModel.swift#L1273) |
| `chatStats` | `ChatStats` | Unread counts and min unread item ID | [L1255](../Shared/Model/ChatModel.swift#L1274) |
| `created` | `Date` | Creation timestamp | [L1256](../Shared/Model/ChatModel.swift#L1275) |
### [ChatStats](../SimpleXChat/ChatTypes.swift#L1877-L1899)
```swift
struct ChatStats: Decodable, Hashable {
var unreadCount: Int = 0
var unreadMentions: Int = 0
var reportsCount: Int = 0
var minUnreadItemId: Int64 = 0
var unreadChat: Bool = false
}
```
### Computed Properties
| Property | Description | Line |
|----------|-------------|------|
| `id` | Chat ID from `chatInfo.id` | [L1287](../Shared/Model/ChatModel.swift#L1306) |
| `viewId` | Unique view identity including creation time | [L1289](../Shared/Model/ChatModel.swift#L1308) |
| `unreadTag` | Whether chat counts as "unread" based on notification settings | [L1279](../Shared/Model/ChatModel.swift#L1298) |
| `supportUnreadCount` | Unread count for group support scope | [L1291](../Shared/Model/ChatModel.swift#L1310) |
---
## 6. [ChatInfo](../SimpleXChat/ChatTypes.swift#L1372-L1852)
**Enum**: `public enum ChatInfo: Identifiable, Decodable, NamedChat, Hashable`
**Source**: [`SimpleXChat/ChatTypes.swift`](../SimpleXChat/ChatTypes.swift#L1372)
Represents the type and metadata of a conversation:
```swift
public enum ChatInfo: Identifiable, Decodable, NamedChat, Hashable {
case direct(contact: Contact)
case group(groupInfo: GroupInfo, groupChatScope: GroupChatScopeInfo?)
case local(noteFolder: NoteFolder)
case contactRequest(contactRequest: UserContactRequest)
case contactConnection(contactConnection: PendingContactConnection)
case invalidJSON(json: Data?)
}
```
### Cases
| Case | Associated Value | Description |
|------|-----------------|-------------|
| `.direct` | `Contact` | One-to-one conversation |
| `.group` | `GroupInfo, GroupChatScopeInfo?` | Group conversation (optional scope for member support threads) |
| `.local` | `NoteFolder` | Local notes (self-chat) |
| `.contactRequest` | `UserContactRequest` | Incoming contact request |
| `.contactConnection` | `PendingContactConnection` | Pending connection |
| `.invalidJSON` | `Data?` | Undecodable chat data |
### Key Computed Properties on ChatInfo
| Property | Type | Description |
|----------|------|-------------|
| `chatType` | `ChatType` | `.direct`, `.group`, `.local`, `.contactRequest`, `.contactConnection` |
| `id` | `ChatId` | Prefixed ID (e.g., `"@1"` for direct, `"#5"` for group) |
| `displayName` | `String` | Contact/group name |
| `image` | `String?` | Profile image (base64) |
| `chatSettings` | `ChatSettings?` | Notification/favorite settings |
| `chatTags` | `[Int64]?` | Assigned tag IDs |
---
## 7. State Flow
### App Start
```
SimpleXApp.init()
→ haskell_init()
→ initChatAndMigrate()
→ chat_migrate_init_key() -- creates/opens DB
→ startChat(mainApp: true) -- starts core
→ apiGetChats(userId) -- populates ChatModel.chats
→ UI renders ChatListView
```
### Opening a Chat
```
User taps chat in ChatListView
→ ItemsModel.loadOpenChat(chatId)
→ 250ms delay for navigation animation
→ ChatModel.chatId = chatId
→ loadChat(chatId:, im:)
→ apiGetChat(chatId, pagination: .last(count: 50))
→ ItemsModel.reversedChatItems = [ChatItem]
→ ChatView renders messages
```
### Receiving a Message (Event)
```
Haskell core generates ChatEvent.newChatItems
→ Event loop calls chat_recv_msg_wait
→ Decoded as ChatEvent.newChatItems(user, chatItems)
→ ChatModel updates:
1. Insert new Chat items into ChatModel.chats (preview)
2. If chat is open: insert into ItemsModel.reversedChatItems
3. Update ChatStats (unread counts)
4. Update ChatTagsModel (tag unread counts)
→ SwiftUI re-renders affected views via @Published observation
```
### Sending a Message
```
User taps send in ComposeView
→ apiSendMessages(type, id, scope, live, ttl, composedMessages)
→ Haskell processes, returns ChatResponse1.newChatItems
→ ChatModel.chats updated with new preview
→ ItemsModel.reversedChatItems gets new item
→ ChatView scrolls to bottom, shows sent message
```
---
## 8. Preference Storage
### UserDefaults (via @AppStorage)
App-level UI settings stored in `UserDefaults.standard`:
| Key Constant | Type | Description |
|--------------|------|-------------|
| `DEFAULT_PERFORM_LA` | `Bool` | Enable local authentication |
| `DEFAULT_PRIVACY_PROTECT_SCREEN` | `Bool` | Hide screen in app switcher |
| `DEFAULT_SHOW_LA_NOTICE` | `Bool` | Show LA setup notice |
| `DEFAULT_NOTIFICATION_ALERT_SHOWN` | `Bool` | Notification permission alert shown |
| `DEFAULT_CALL_KIT_CALLS_IN_RECENTS` | `Bool` | Show CallKit calls in recents |
### GroupDefaults
Settings shared between main app and extensions (NSE, SE) via app group `UserDefaults`:
| Key | Description |
|-----|-------------|
| `appStateGroupDefault` | Current app state (.active/.suspended/.stopped) |
| `dbContainerGroupDefault` | Database container location (.group/.documents) |
| `ntfPreviewModeGroupDefault` | Notification preview mode |
| `storeDBPassphraseGroupDefault` | Whether to store DB passphrase |
| `callKitEnabledGroupDefault` | Whether CallKit is enabled |
| `onboardingStageDefault` | Current onboarding stage |
| `currentThemeDefault` | Current theme name |
| `systemDarkThemeDefault` | Dark mode theme name |
| `themeOverridesDefault` | Custom theme overrides |
| `currentThemeIdsDefault` | Active theme override IDs |
### Keychain (KeyChain wrapper)
Sensitive data stored in iOS Keychain:
| Key | Description |
|-----|-------------|
| `kcDatabasePassword` | SQLite database encryption key |
| `kcAppPassword` | App lock password |
| `kcSelfDestructPassword` | Self-destruct trigger password |
### Haskell DB (via apiSaveSettings / apiGetSettings)
Chat-level preferences stored in the SQLite database (managed by Haskell core):
- Per-contact preferences (timed messages, voice, calls, etc.)
- Per-group preferences
- Per-user notification settings
- Network configuration
- Server lists
---
## Source Files
| File | Path |
|------|------|
| ChatModel, ItemsModel, Chat, ChatTagsModel | [`Shared/Model/ChatModel.swift`](../Shared/Model/ChatModel.swift) |
| ChatInfo, User, Contact, GroupInfo, ChatItem | [`SimpleXChat/ChatTypes.swift`](../SimpleXChat/ChatTypes.swift) |
| ActiveFilter | [`Shared/Views/ChatList/ChatListView.swift`](../Shared/Views/ChatList/ChatListView.swift#L52) |
| Preference defaults | [`Shared/Model/ChatModel.swift`](../Shared/Model/ChatModel.swift), [`SimpleXChat/FileUtils.swift`](../SimpleXChat/FileUtils.swift) |
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