session-ios/SessionMessagingKit/Open Groups/OpenGroupAPI.swift

import PromiseKit
import SessionSnodeKit
import Sodium
import Curve25519Kit

@objc(SNOpenGroupAPI)
public final class OpenGroupAPI: NSObject {
    
    // MARK: - Settings
    
    public static let defaultServer = "http://116.203.70.33"
    public static let defaultServerPublicKey = "a03c383cf63c3c4efe67acc52112a6dd734b3a946b9545f488aaa93da7991238"
    
    public static let workQueue = DispatchQueue(label: "OpenGroupAPI.workQueue", qos: .userInitiated) // It's important that this is a serial queue
    
    // MARK: - Polling State
    
    private static var hasPerformedInitialPoll: Atomic<[String: Bool]> = Atomic([:])
    private static var timeSinceLastPoll: Atomic<[String: TimeInterval]> = Atomic([:])
    private static var lastPollTime: Atomic<TimeInterval> = Atomic(.greatestFiniteMagnitude)

    private static let timeSinceLastOpen: Atomic<TimeInterval> = {
        guard let lastOpen = UserDefaults.standard[.lastOpen] else { return Atomic(.greatestFiniteMagnitude) }
        
        return Atomic(Date().timeIntervalSince(lastOpen))
    }()
    
    
    // TODO: Remove these
    private static var legacyAuthTokenPromises: Atomic<[String: Promise<String>]> = Atomic([:])
    private static var legacyHasUpdatedLastOpenDate = false
    private static var legacyGroupImagePromises: [String: Promise<Data>] = [:]
    

    // MARK: - Batching & Polling
    
    /// This is a convenience method which calls `/batch` with a pre-defined set of requests used to update an Open
    /// Group, currently this will retrieve:
    /// - Capabilities for the server
    /// - For each room:
    ///    - Poll Info
    ///    - Messages (includes additions and deletions)
    /// - Inbox for the server
    /// - Outbox for the server
    public static func poll(_ server: String, using dependencies: Dependencies = Dependencies()) -> Promise<[Endpoint: (OnionRequestResponseInfoType, Codable?)]> {
        // Store a local copy of the cached state for this server
        let hadPerformedInitialPoll: Bool = (hasPerformedInitialPoll.wrappedValue[server] == true)
        let originalTimeSinceLastPoll: TimeInterval = (timeSinceLastPoll.wrappedValue[server] ?? min(lastPollTime.wrappedValue, timeSinceLastOpen.wrappedValue))
        let maybeLastInboxMessageId: Int64? = dependencies.storage.getOpenGroupInboxLatestMessageId(for: server)
        let maybeLastOutboxMessageId: Int64? = dependencies.storage.getOpenGroupOutboxLatestMessageId(for: server)
        let lastInboxMessageId: Int64 = (maybeLastInboxMessageId ?? 0)
        let lastOutboxMessageId: Int64 = (maybeLastOutboxMessageId ?? 0)
        
        // Update the cached state for this server
        hasPerformedInitialPoll.mutate { $0[server] = true }
        lastPollTime.mutate { $0 = min($0, timeSinceLastOpen.wrappedValue)}
        UserDefaults.standard[.lastOpen] = Date()
        
        // Generate the requests
        let requestResponseType: [BatchRequestInfoType] = [
            BatchRequestInfo(
                request: Request<NoBody>(
                    server: server,
                    endpoint: .capabilities
                ),
                responseType: Capabilities.self
            )
        ]
        .appending(
            // Per-room requests
            dependencies.storage.getAllOpenGroups().values
                .filter { $0.server == server.lowercased() }    // Note: The `OpenGroup` type converts to lowercase in init
                .flatMap { openGroup -> [BatchRequestInfoType] in
                    let lastSeqNo: Int64? = dependencies.storage.getOpenGroupSequenceNumber(for: openGroup.room, on: server)
                    let targetSeqNo: Int64 = (lastSeqNo ?? 0)
                    let shouldRetrieveRecentMessages: Bool = (
                        lastSeqNo == nil || (
                            // If it's the first poll for this launch and it's been longer than
                            // 'maxInactivityPeriod' then just retrieve recent messages instead
                            // of trying to get all messages since the last one retrieved
                            !hadPerformedInitialPoll &&
                            originalTimeSinceLastPoll > OpenGroupAPI.Poller.maxInactivityPeriod
                        )
                    )
                    
                    return [
                        BatchRequestInfo(
                            request: Request<NoBody>(
                                server: server,
                                endpoint: .roomPollInfo(openGroup.room, openGroup.infoUpdates)
                            ),
                            responseType: RoomPollInfo.self
                        ),
                        BatchRequestInfo(
                            request: Request<NoBody>(
                                server: server,
                                endpoint: (shouldRetrieveRecentMessages ?
                                    .roomMessagesRecent(openGroup.room) :
                                    .roomMessagesSince(openGroup.room, seqNo: targetSeqNo)
                                )
                            ),
                            responseType: [Message].self
                        )
                    ]
                }
        )
        .appending([
            // Inbox
            BatchRequestInfo(
                request: Request<NoBody>(
                    server: server,
                    endpoint: (maybeLastInboxMessageId == nil ?
                        .inbox :
                        .inboxSince(id: lastInboxMessageId)
                   )
                ),
                responseType: [DirectMessage]?.self // 'inboxSince' will return a `304` with an empty response if no messages
            ),
            
            // Outbox
            BatchRequestInfo(
                request: Request<NoBody>(
                    server: server,
                    endpoint: (maybeLastOutboxMessageId == nil ?
                        .outbox :
                        .outboxSince(id: lastOutboxMessageId)
                   )
                ),
                responseType: [DirectMessage]?.self // 'outboxSince' will return a `304` with an empty response if no messages
            )
        ])
        
        return batch(server, requests: requestResponseType, using: dependencies)
    }
    
    /// Submits multiple requests wrapped up in a single request, runs them all, then returns the result of each one
    ///
    /// Requests are performed independently, that is, if one fails the others will still be attempted - there is no guarantee on the order in which requests will be
    /// carried out (for sequential, related requests invoke via `/sequence` instead)
    ///
    /// For contained subrequests that specify a body (i.e. POST or PUT requests) exactly one of `json`, `b64`, or `bytes` must be provided with the request body.
    private static func batch(_ server: String, requests: [BatchRequestInfoType], using dependencies: Dependencies = Dependencies()) -> Promise<[Endpoint: (OnionRequestResponseInfoType, Codable?)]> {
        let requestBody: BatchRequest = requests.map { $0.toSubRequest() }
        let responseTypes = requests.map { $0.responseType }
        
        let request: Request = Request(
            method: .post,
            server: server,
            endpoint: .batch,
            body: requestBody
        )
        
        return send(request, using: dependencies)
            .decoded(as: responseTypes, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
            .map { result in
                result.enumerated()
                    .reduce(into: [:]) { prev, next in
                        prev[requests[next.offset].endpoint] = next.element
                    }
            }
    }
    
    /// This is like `/batch`, except that it guarantees to perform requests sequentially in the order provided and will stop processing requests if the previous request
    /// returned a non-`2xx` response
    ///
    /// For example, this can be used to ban and delete all of a user's messages by sequencing the ban followed by the `delete_all`: if the ban fails (e.g. because
    /// permission is denied) then the `delete_all` will not occur. The batch body and response are identical to the `/batch` endpoint; requests that are not
    /// carried out because of an earlier failure will have a response code of `412` (Precondition Failed)."
    ///
    /// Like `/batch`, responses are returned in the same order as requests, but unlike `/batch` there may be fewer elements in the response list (if requests were
    /// stopped because of a non-2xx response) - In such a case, the final, non-2xx response is still included as the final response value
    private static func sequence(_ server: String, requests: [BatchRequestInfoType], using dependencies: Dependencies = Dependencies()) -> Promise<[Endpoint: (OnionRequestResponseInfoType, Codable?)]> {
        let requestBody: BatchRequest = requests.map { $0.toSubRequest() }
        let responseTypes = requests.map { $0.responseType }
        
        let request: Request = Request(
            method: .post,
            server: server,
            endpoint: .sequence,
            body: requestBody
        )
        
        // TODO: Handle a `412` response (ie. a required capability isn't supported)
        return send(request, using: dependencies)
            .decoded(as: responseTypes, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
            .map { result in
                result.enumerated()
                    .reduce(into: [:]) { prev, next in
                        prev[requests[next.offset].endpoint] = next.element
                    }
            }
    }
    
    // MARK: - Capabilities
    
    /// Return the list of server features/capabilities
    ///
    /// Optionally takes a `required` parameter containing a comma-separated list of capabilites; if any are not satisfied a 412 (Precondition Failed) response
    /// will be returned with missing requested capabilities in the `missing` key
    ///
    /// Eg. `GET /capabilities` could return `{"capabilities": ["sogs", "batch"]}` `GET /capabilities?required=magic,batch`
    /// could return: `{"capabilities": ["sogs", "batch"], "missing": ["magic"]}`
    public static func capabilities(on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, Capabilities)> {
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .capabilities,
            queryParameters: [:] // TODO: Add any requirements '.required'.
        )
        
        // TODO: Handle a `412` response (ie. a required capability isn't supported)
        return send(request, using: dependencies)
            .decoded(as: Capabilities.self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    // MARK: - Room
    
    /// Returns a list of available rooms on the server
    ///
    /// Rooms to which the user does not have access (e.g. because they are banned, or the room has restricted access permissions) are not included
    public static func rooms(for server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, [Room])> {
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .rooms
        )
        
        return send(request, using: dependencies)
            .decoded(as: [Room].self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    /// Returns the details of a single room
    public static func room(for roomToken: String, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, Room)> {
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .room(roomToken)
        )
        
        return send(request, using: dependencies)
            .decoded(as: Room.self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    /// Polls a room for metadata updates
    ///
    /// The endpoint polls room metadata for this room, always including the instantaneous room details (such as the user's permission and current
    /// number of active users), and including the full room metadata if the room's info_updated counter has changed from the provided value
    ///
    /// **Note:** This is the direct request to retrieve room updates so should be retrieved automatically from the `poll()` method, in order to call
    /// this directly remove the `@available` line and make sure to route the response of this method to the `OpenGroupManager.handlePollInfo`
    /// method to ensure things are processed correctly
    @available(*, unavailable, message: "Avoid using this directly, use the pre-build `poll()` method instead")
    public static func roomPollInfo(lastUpdated: Int64, for roomToken: String, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, RoomPollInfo)> {
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .roomPollInfo(roomToken, lastUpdated)
        )
        
        return send(request, using: dependencies)
            .decoded(as: RoomPollInfo.self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    // MARK: - Messages
    
    /// Posts a new message to a room
    public static func send(
        _ plaintext: Data,
        to roomToken: String,
        on server: String,
        whisperTo: String?,
        whisperMods: Bool,
        using dependencies: Dependencies = Dependencies()
    ) -> Promise<(OnionRequestResponseInfoType, Message)> {
        guard let signResult: (publicKey: String, signature: Bytes) = sign(plaintext.bytes, for: server, using: dependencies) else {
            return Promise(error: Error.signingFailed)
        }
        
        let requestBody: SendMessageRequest = SendMessageRequest(
            data: plaintext,
            signature: Data(signResult.signature),
            whisperTo: whisperTo,
            whisperMods: whisperMods,
            fileIds: nil // TODO: Add support for 'fileIds'.
        )
        
        let request = Request(
            method: .post,
            server: server,
            endpoint: .roomMessage(roomToken),
            body: requestBody
        )
        
        return send(request, using: dependencies)
            .decoded(as: Message.self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    /// Returns a single message by ID
    public static func message(_ id: Int64, in roomToken: String, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, Message)> {
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .roomMessageIndividual(roomToken, id: id)
        )

        return send(request, using: dependencies)
            .decoded(as: Message.self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    /// Edits a message, replacing its existing content with new content and a new signature
    ///
    /// **Note:** This edit may only be initiated by the creator of the post, and the poster must currently have write permissions in the room
    public static func messageUpdate(
        _ id: Int64,
        plaintext: Data,
        fileIds: [Int64]?,
        in roomToken: String,
        on server: String,
        using dependencies: Dependencies = Dependencies()
    ) -> Promise<(OnionRequestResponseInfoType, Data?)> {
        guard let signResult: (publicKey: String, signature: Bytes) = sign(plaintext.bytes, for: server, using: dependencies) else {
            return Promise(error: Error.signingFailed)
        }
        
        let requestBody: UpdateMessageRequest = UpdateMessageRequest(
            data: plaintext,
            signature: Data(signResult.signature),
            fileIds: fileIds
        )
        
        let request: Request = Request(
            method: .put,
            server: server,
            endpoint: .roomMessageIndividual(roomToken, id: id),
            body: requestBody
        )

        // TODO: Handle custom response info?
        return send(request, using: dependencies)
    }
    
    // TODO: Need to test this once the API has been implemented
    public static func messageDelete(
        _ id: Int64,
        in roomToken: String,
        on server: String,
        using dependencies: Dependencies = Dependencies()
    ) -> Promise<(OnionRequestResponseInfoType, Data?)> {
        let request: Request = Request<NoBody>(
            method: .delete,
            server: server,
            endpoint: .roomMessageIndividual(roomToken, id: id)
        )

        // TODO: Handle custom response info? Need to let the OpenGroupManager know to delete the message?
        // TODO: !!!! This is currently broken - looks like there isn't currently a DELETE endpoint (but there should be)
        return send(request, using: dependencies)
            .map { response in
                print("RAWR")
                return response
            }
    }
    
    /// **Note:** This is the direct request to retrieve recent messages so should be retrieved automatically from the `poll()` method, in order to call
    /// this directly remove the `@available` line and make sure to route the response of this method to the `OpenGroupManager.handleMessages`
    /// method to ensure things are processed correctly
    @available(*, unavailable, message: "Avoid using this directly, use the pre-build `poll()` method instead")
    public static func recentMessages(in roomToken: String, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, [Message])> {
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .roomMessagesRecent(roomToken)
            // TODO: Limit?.
//            queryParameters: [ .limit: 50 ]
        )

        return send(request, using: dependencies)
            .decoded(as: [Message].self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    /// **Note:** This is the direct request to retrieve recent messages before a given message  and is currently unused, in order to call this directly
    /// remove the `@available` line and make sure to route the response of this method to the `OpenGroupManager.handleMessages`
    /// method to ensure things are processed correctly
    @available(*, unavailable, message: "Avoid using this directly, use the pre-build `poll()` method instead")
    public static func messagesBefore(messageId: Int64, in roomToken: String, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, [Message])> {
        // TODO: Do we need to be able to load old messages?
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .roomMessagesBefore(roomToken, id: messageId)
            // TODO: Limit?.
//            queryParameters: [ .limit: 50 ]
        )

        return send(request, using: dependencies)
            .decoded(as: [Message].self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    /// **Note:** This is the direct request to retrieve messages since a given message `seqNo` so should be retrieved automatically from the
    /// `poll()` method, in order to call this directly remove the `@available` line and make sure to route the response of this method to the
    /// `OpenGroupManager.handleMessages` method to ensure things are processed correctly
    @available(*, unavailable, message: "Avoid using this directly, use the pre-build `poll()` method instead")
    public static func messagesSince(seqNo: Int64, in roomToken: String, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, [Message])> {
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .roomMessagesSince(roomToken, seqNo: seqNo)
            // TODO: Limit?.
//            queryParameters: [ .limit: 50 ]
        )

        return send(request, using: dependencies)
            .decoded(as: [Message].self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    // MARK: - Pinning
    
    /// Adds a pinned message to this room
    ///
    /// **Note:** Existing pinned messages are not removed: the new message is added to the pinned message list (If you want to remove existing
    /// pins then build a sequence request that first calls .../unpin/all)
    ///
    /// The user must have admin (not just moderator) permissions in the room in order to pin messages
    ///
    /// Pinned messages that are already pinned will be re-pinned (that is, their pin timestamp and pinning admin user will be updated) - because pinned
    /// messages are returned in pinning-order this allows admins to order multiple pinned messages in a room by re-pinning (via this endpoint) in the
    /// order in which pinned messages should be displayed
    public static func pinMessage(id: Int64, in roomToken: String, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<OnionRequestResponseInfoType> {
        let request: Request = Request<NoBody>(
            method: .post,
            server: server,
            endpoint: .roomPinMessage(roomToken, id: id)
        )

        return send(request, using: dependencies)
            .map { responseInfo, _ in responseInfo }
    }
    
    /// Remove a message from this room's pinned message list
    ///
    /// The user must have `admin` (not just `moderator`) permissions in the room
    public static func unpinMessage(id: Int64, in roomToken: String, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<OnionRequestResponseInfoType> {
        let request: Request = Request<NoBody>(
            method: .post,
            server: server,
            endpoint: .roomUnpinMessage(roomToken, id: id)
        )

        return send(request, using: dependencies)
            .map { responseInfo, _ in responseInfo }
    }

    /// Removes _all_ pinned messages from this room
    ///
    /// The user must have `admin` (not just `moderator`) permissions in the room
    public static func unpinAll(in roomToken: String, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<OnionRequestResponseInfoType> {
        let request: Request = Request<NoBody>(
            method: .post,
            server: server,
            endpoint: .roomUnpinAll(roomToken)
        )

        return send(request, using: dependencies)
            .map { responseInfo, _ in responseInfo }
    }
    
    // MARK: - Files
    
    public static func uploadFile(_ bytes: [UInt8], fileName: String? = nil, to roomToken: String, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, FileUploadResponse)> {
        let request: Request = Request(
            method: .post,
            server: server,
            endpoint: .roomFile(roomToken),
            headers: [ .fileName: fileName ].compactMapValues { $0 },
            body: bytes
        )
        
        return send(request, using: dependencies)
            .decoded(as: FileUploadResponse.self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    /// Warning: This approach is less efficient as it expects the data to be base64Encoded (with is 33% larger than binary), please use the binary approach
    /// whenever possible
    public static func uploadFile(_ base64EncodedString: String, fileName: String? = nil, to roomToken: String, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, FileUploadResponse)> {
        let request: Request = Request(
            method: .post,
            server: server,
            endpoint: .roomFileJson(roomToken),
            headers: [ .fileName: fileName ].compactMapValues { $0 },
            body: base64EncodedString
        )
        
        return send(request, using: dependencies)
            .decoded(as: FileUploadResponse.self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    public static func downloadFile(_ fileId: Int64, from roomToken: String, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, Data)> {
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .roomFileIndividual(roomToken, fileId)
        )
        
        return send(request, using: dependencies)
            .map { responseInfo, maybeData in
                guard let data: Data = maybeData else { throw Error.parsingFailed }
                
                return (responseInfo, data)
            }
    }
    
    public static func downloadFileJson(_ fileId: Int64, from roomToken: String, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, FileDownloadResponse)> {
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .roomFileIndividualJson(roomToken, fileId)
        )
        // TODO: This endpoint is getting rewritten to return just data (properties would come through as headers).
        return send(request, using: dependencies)
            .decoded(as: FileDownloadResponse.self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    // MARK: - Inbox/Outbox (Message Requests)

    /// Retrieves all of the user's current DMs (up to limit)
    ///
    /// **Note:** This is the direct request to retrieve DMs for a specific Open Group so should be retrieved automatically from the `poll()`
    /// method, in order to call this directly remove the `@available` line and make sure to route the response of this method to the
    /// `OpenGroupManager.handleDirectMessages` method to ensure things are processed correctly
    @available(*, unavailable, message: "Avoid using this directly, use the pre-build `poll()` method instead")
    public static func inbox(on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, [DirectMessage]?)> {
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .inbox
        )
        
        return send(request, using: dependencies)
            .decoded(as: [DirectMessage]?.self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    /// Polls for any DMs received since the given id, this method will return a `304` with an empty response if there are no messages
    ///
    /// **Note:** This is the direct request to retrieve messages requests for a specific Open Group since a given messages so should be retrieved
    /// automatically from the `poll()` method, in order to call this directly remove the `@available` line and make sure to route the response
    /// of this method to the `OpenGroupManager.handleDirectMessages` method to ensure things are processed correctly
    @available(*, unavailable, message: "Avoid using this directly, use the pre-build `poll()` method instead")
    public static func inboxSince(id: Int64, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, [DirectMessage]?)> {
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .inboxSince(id: id)
        )
        
        return send(request, using: dependencies)
            .decoded(as: [DirectMessage]?.self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    /// Delivers a direct message to a user via their blinded Session ID
    ///
    /// The body of this request is a JSON object containing a message key with a value of the encrypted-then-base64-encoded message to deliver
    public static func send(_ ciphertext: Data, toInboxFor blindedSessionId: String, on server: String/*, with serverPublicKey: String*/, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, Data?)> {
        let requestBody: SendDirectMessageRequest = SendDirectMessageRequest(
            message: ciphertext
        )
        
        let request: Request = Request(
            method: .post,
            server: server,
            endpoint: .inboxFor(sessionId: blindedSessionId),
            body: requestBody
        )
        
        return send(request, using: dependencies)
    }
    
    /// Retrieves all of the user's sent DMs (up to limit)
    ///
    /// **Note:** This is the direct request to retrieve DMs sent by the user for a specific Open Group so should be retrieved automatically
    /// from the `poll()` method, in order to call this directly remove the `@available` line and make sure to route the response of
    /// this method to the `OpenGroupManager.handleDirectMessages` method to ensure things are processed correctly
    @available(*, unavailable, message: "Avoid using this directly, use the pre-build `poll()` method instead")
    public static func outbox(on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, [DirectMessage]?)> {
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .outbox
        )
        
        return send(request, using: dependencies)
            .decoded(as: [DirectMessage]?.self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    /// Polls for any DMs sent since the given id, this method will return a `304` with an empty response if there are no messages
    ///
    /// **Note:** This is the direct request to retrieve messages requests sent by the user for a specific Open Group since a given messages so
    /// should be retrieved automatically from the `poll()` method, in order to call this directly remove the `@available` line and make sure
    /// to route the response of this method to the `OpenGroupManager.handleDirectMessages` method to ensure things are processed correctly
    @available(*, unavailable, message: "Avoid using this directly, use the pre-build `poll()` method instead")
    public static func outboxSince(id: Int64, on server: String, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, [DirectMessage]?)> {
        let request: Request = Request<NoBody>(
            server: server,
            endpoint: .outboxSince(id: id)
        )
        
        return send(request, using: dependencies)
            .decoded(as: [DirectMessage]?.self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    // MARK: - Users
    
    /// Applies a ban of a user from specific rooms, or from the server globally
    ///
    /// The invoking user must have `moderator` (or `admin`) permission in all given rooms when specifying rooms, and must be a
    /// `globalModerator` (or `globalAdmin`) if using the global parameter
    ///
    /// **Note:** The user's messages are not deleted by this request - In order to ban and delete all messages use the `/sequence` endpoint to
    /// bundle a `/user/.../ban` with a `/user/.../deleteMessages` request
    ///
    /// - Parameters:
    ///   - sessionId: The sessionId (either standard or blinded) of the user whose messages should be deleted
    ///
    ///   - timeout: Value specifying a time limit on the ban, in seconds
    ///
    ///     The applied ban will expire and be removed after the given interval - If omitted (or `null`) then the ban is permanent
    ///
    ///     If this endpoint is called multiple times then the timeout of the last call takes effect (eg. a permanent ban can be replaced
    ///     with a time-limited ban by calling the endpoint again with a timeout value, and vice versa)
    ///
    ///   - roomTokens: List of one or more room tokens from which the user should be banned from
    ///
    ///     The invoking user **must** be a moderator of all of the given rooms.
    ///
    ///     This may be set to the single-element list `["*"]` to ban the user from all rooms in which the current user has moderator
    ///     permissions (the call will succeed if the calling user is a moderator in at least one channel)
    ///
    ///     **Note:** You can ban from all rooms on a server by providing a `nil` value for this parameter (the invoking user must be a
    ///     global moderator in order to add a global ban)
    ///
    ///   - server: The server to delete messages from
    ///
    ///   - dependencies: Injected dependencies (used for unit testing)
    public static func userBan(
        _ sessionId: String,
        for timeout: TimeInterval? = nil,
        from roomTokens: [String]? = nil,
        on server: String,
        using dependencies: Dependencies = Dependencies()
    ) -> Promise<(OnionRequestResponseInfoType, Data?)> {
        let requestBody: UserBanRequest = UserBanRequest(
            rooms: roomTokens,
            global: (roomTokens == nil ? true : nil),
            timeout: timeout
        )
        
        let request: Request = Request(
            method: .post,
            server: server,
            endpoint: .userBan(sessionId),
            body: requestBody
        )
        
        return send(request, using: dependencies)
    }
    
    /// Removes a user ban from specific rooms, or from the server globally
    ///
    /// The invoking user must have `moderator` (or `admin`) permission in all given rooms when specifying rooms, and must be a global server `moderator`
    /// (or `admin`) if using the `global` parameter
    ///
    /// **Note:** Room and global bans are independent: if a user is banned globally and has a room-specific ban then removing the global ban does not remove
    /// the room specific ban, and removing the room-specific ban does not remove the global ban (to fully unban a user globally and from all rooms, submit a
    /// `/sequence` request with a global unban followed by a "rooms": ["*"] unban)
    ///
    /// - Parameters:
    ///   - sessionId: The sessionId (either standard or blinded) of the user whose messages should be deleted
    ///
    ///   - roomTokens: List of one or more room tokens from which the user should be unbanned from
    ///
    ///     The invoking user **must** be a moderator of all of the given rooms.
    ///
    ///     This may be set to the single-element list `["*"]` to unban the user from all rooms in which the current user has moderator
    ///     permissions (the call will succeed if the calling user is a moderator in at least one channel)
    ///
    ///     **Note:** You can ban from all rooms on a server by providing a `nil` value for this parameter
    ///
    ///   - server: The server to delete messages from
    ///
    ///   - dependencies: Injected dependencies (used for unit testing)
    public static func userUnban(
        _ sessionId: String,
        from roomTokens: [String]?,
        on server: String,
        using dependencies: Dependencies = Dependencies()
    ) -> Promise<(OnionRequestResponseInfoType, Data?)> {
        let requestBody: UserUnbanRequest = UserUnbanRequest(
            rooms: roomTokens,
            global: (roomTokens == nil ? true : nil)
        )
        
        let request: Request = Request(
            method: .post,
            server: server,
            endpoint: .userUnban(sessionId),
            body: requestBody
        )
        
        return send(request, using: dependencies)
    }
    
    /// Appoints or removes a moderator or admin
    ///
    /// This endpoint is used to appoint or remove moderator/admin permissions either for specific rooms or for server-wide global moderator permissions
    ///
    /// Admins/moderators of rooms can only be appointed or removed by a user who has admin permissions in the room (including global admins)
    ///
    /// Global admins/moderators may only be appointed by a global admin
    ///
    /// The admin/moderator paramters interact as follows:
    /// - **admin=true, moderator omitted:** This adds admin permissions, which automatically also implies moderator permissions
    /// - **admin=true, moderator=true:** Exactly the same as above
    /// - **admin=false, moderator=true:** Removes any existing admin permissions from the rooms (or globally), if present, and adds
    /// moderator permissions to the rooms/globally (if not already present)
    /// - **admin=false, moderator omitted:** This removes admin permissions but leaves moderator permissions, if present (this
    /// effectively "downgrades" an admin to a moderator).  Unlike the above this does **not** add moderator permissions to matching rooms
    /// if not already present
    /// - **moderator=true, admin omitted:** Adds moderator permissions to the given rooms (or globally), if not already present.  If
    /// the user already has admin permissions this does nothing (that is, admin permission is *not* removed, unlike the above)
    /// - **moderator=false, admin omitted:** This removes moderator **and** admin permissions from all given rooms (or globally)
    /// - **moderator=false, admin=false:** Exactly the same as above
    /// - **moderator=false, admin=true:** This combination is **not permitted** (because admin permissions imply moderator
    /// permissions) and will result in Bad Request error if given
    ///
    /// - Parameters:
    ///   - sessionId: The sessionId (either standard or blinded) of the user to modify the permissions of
    ///
    ///   - moderator: Value indicating that this user should have moderator permissions added (true), removed (false), or left alone (null)
    ///
    ///   - admin: Value indicating that this user should have admin permissions added (true), removed (false), or left alone (null)
    ///
    ///     Granting admin permission automatically includes granting moderator permission (and thus it is an error to use admin=true with
    ///     moderator=false)
    ///
    ///   - visible: Value indicating whether the moderator/admin should be made publicly visible as a moderator/admin of the room(s)
    ///   (if true) or hidden (false)
    ///
    ///     Hidden moderators/admins still have all the same permissions as visible moderators/admins, but are visible only to other
    ///     moderators/admins; regular users in the room will not know their moderator status
    ///
    ///   - roomTokens: List of one or more room tokens to which the permission changes should be applied
    ///
    ///     The invoking user **must** be an admin of all of the given rooms.
    ///
    ///     This may be set to the single-element list `["*"]` to add or remove the moderator from all rooms in which the current user has admin
    ///     permissions (the call will succeed if the calling user is an admin in at least one channel)
    ///
    ///     **Note:** You can specify a change to global permisisons by providing a `nil` value for this parameter
    ///
    ///   - server: The server to perform the permission changes on
    ///
    ///   - dependencies: Injected dependencies (used for unit testing)
    public static func userModeratorUpdate(
        _ sessionId: String,
        moderator: Bool? = nil,
        admin: Bool? = nil,
        visible: Bool,
        for roomTokens: [String]?,
        on server: String,
        using dependencies: Dependencies = Dependencies()
    ) -> Promise<(OnionRequestResponseInfoType, Data?)> {
        guard (moderator != nil && admin == nil) || (moderator == nil && admin != nil) else { return Promise(error: Error.generic) }
        
        let requestBody: UserModeratorRequest = UserModeratorRequest(
            rooms: roomTokens,
            global: (roomTokens == nil ? true : nil),
            moderator: moderator,
            admin: admin,
            visible: visible
        )
        
        let request: Request = Request(
            method: .post,
            server: server,
            endpoint: .userModerator(sessionId),
            body: requestBody
        )
        
        return send(request, using: dependencies)
    }
    
    // TODO: Need to test this once the API has been implemented
    // TODO: Update docs to align with the API documentation once implemented
    /// Deletes all messages from a given sessionId within the provided rooms (or globally) on a server
    ///
    /// - Parameters:
    ///   - sessionId: The sessionId (either standard or blinded) of the user whose messages should be deleted
    ///
    ///   - roomTokens: List of one or more room tokens from which the messages should be deleted
    ///
    ///     The invoking user **must** be an admin of all of the given rooms.
    ///
    ///     This may be set to the single-element list `["*"]` to add or remove the moderator from all rooms in which the current user has admin
    ///     permissions (the call will succeed if the calling user is an admin in at least one channel)
    ///
    ///     **Note:** You can delete messages from all rooms on a server by providing a `nil` value for this parameter
    ///
    ///   - server: The server to delete messages from
    ///
    ///   - dependencies: Injected dependencies (used for unit testing)
    public static func userDeleteMessages(
        _ sessionId: String,
        for roomTokens: [String]?,
        on server: String,
        using dependencies: Dependencies = Dependencies()
    ) -> Promise<(OnionRequestResponseInfoType, UserDeleteMessagesResponse)> {
        let requestBody: UserDeleteMessagesRequest = UserDeleteMessagesRequest(
            rooms: roomTokens,
            global: (roomTokens == nil ? true : nil)
        )
        
        let request: Request = Request(
            method: .post,
            server: server,
            endpoint: .userDeleteMessages(sessionId),
            body: requestBody
        )
        
        return send(request, using: dependencies)
            .decoded(as: UserDeleteMessagesResponse.self, on: OpenGroupAPI.workQueue, error: Error.parsingFailed, using: dependencies)
    }
    
    // TODO: Need to test this once the API has been implemented
    /// This is a convenience method which constructs a `/sequence` of the `userBan` and `userDeleteMessages`  requests, refer to those
    /// methods for the documented behaviour of each method
    public static func userBanAndDeleteAllMessage(
        _ sessionId: String,
        for roomTokens: [String]?,
        on server: String,
        using dependencies: Dependencies = Dependencies()
    ) -> Promise<[OnionRequestResponseInfoType]> {
        let banRequestBody: UserBanRequest = UserBanRequest(
            rooms: roomTokens,
            global: (roomTokens == nil ? true : nil),
            timeout: nil
        )
        let deleteMessageRequestBody: UserDeleteMessagesRequest = UserDeleteMessagesRequest(
            rooms: roomTokens,
            global: (roomTokens == nil ? true : nil)
        )
        
        // Generate the requests
        let requestResponseType: [BatchRequestInfoType] = [
            BatchRequestInfo(
                request: Request(
                    method: .post,
                    server: server,
                    endpoint: .userBan(sessionId),
                    body: banRequestBody
                )
            ),
            BatchRequestInfo(
                request: Request(
                    method: .post,
                    server: server,
                    endpoint: .userDeleteMessages(sessionId),
                    body: deleteMessageRequestBody
                ),
                responseType: UserDeleteMessagesResponse.self
            )
        ]
        
        return sequence(server, requests: requestResponseType, using: dependencies)
            .map { results in
                // TODO: Handle deletions...???? Hand off to OpenGroupAPIManager?
                return results.values.map { responseInfo, _ in responseInfo }
            }
    }
    
    // MARK: - Authentication
    
    /// Sign a message to be sent to SOGS (handles both un-blinded and blinded signing based on the server capabilities)
    private static func sign(_ messageBytes: Bytes, for serverName: String, using dependencies: Dependencies = Dependencies()) -> (publicKey: String, signature: Bytes)? {
        guard let userEdKeyPair: Box.KeyPair = dependencies.storage.getUserED25519KeyPair() else { return nil }
        guard let serverPublicKey: String = dependencies.storage.getOpenGroupPublicKey(for: serverName) else {
            return nil
        }
        
        let server: Server? = dependencies.storage.getOpenGroupServer(name: serverName)

        // Check if the server supports blinded keys, if so then sign using the blinded key
        if server?.capabilities.capabilities.contains(.blind) == true {
            guard let blindedKeyPair: Box.KeyPair = dependencies.sodium.blindedKeyPair(serverPublicKey: serverPublicKey, edKeyPair: userEdKeyPair, genericHash: dependencies.genericHash) else {
                return nil
            }
            
            guard let signatureResult: Bytes = dependencies.sodium.sogsSignature(message: messageBytes, secretKey: userEdKeyPair.secretKey, blindedSecretKey: blindedKeyPair.secretKey, blindedPublicKey: blindedKeyPair.publicKey) else {
                return nil
            }
            
            return (
                publicKey: SessionId(.blinded, publicKey: blindedKeyPair.publicKey).hexString,
                signature: signatureResult
            )
        }
        
        // Otherwise fall back to sign using the unblinded key
        guard let signatureResult: Bytes = dependencies.sign.signature(message: messageBytes, secretKey: userEdKeyPair.secretKey) else {
            return nil
        }
        
        return (
            publicKey: SessionId(.unblinded, publicKey: userEdKeyPair.publicKey).hexString,
            signature: signatureResult
        )
    }
    
    /// Sign a request to be sent to SOGS (handles both un-blinded and blinded signing based on the server capabilities)
    private static func sign(_ request: URLRequest, for serverName: String, with serverPublicKey: String, using dependencies: Dependencies = Dependencies()) -> URLRequest? {
        guard let url: URL = request.url else { return nil }
        
        var updatedRequest: URLRequest = request
        let path: String = url.path
            .appending(url.query.map { value in "?\(value)" })
        let method: String = (request.httpMethod ?? "GET")
        let timestamp: Int = Int(floor(dependencies.date.timeIntervalSince1970))
        let nonce: Data = Data(dependencies.nonceGenerator16.nonce())
        
        guard let serverPublicKeyData: Data = serverPublicKey.dataFromHex() else { return nil }
        guard let timestampBytes: Bytes = "\(timestamp)".data(using: .ascii)?.bytes else { return nil }
        
        /// Get a hash of any body content
        let bodyHash: Bytes? = {
            // Note: We need the `!body.isEmpty` check because of the default `Data()` value when trying to
            // init data from the httpBodyStream
            guard let body: Data = (request.httpBody ?? request.httpBodyStream.map { ((try? Data(from: $0)) ?? Data()) }), !body.isEmpty else {
                return nil
            }
            
            return dependencies.genericHash.hash(message: body.bytes, outputLength: 64)
        }()
        
        /// Generate the signature message
        /// "ServerPubkey || Nonce || Timestamp || Method || Path || Blake2b Hash(Body)
        ///     `ServerPubkey`
        ///     `Nonce`
        ///     `Timestamp` is the bytes of an ascii decimal string
        ///     `Method`
        ///     `Path`
        ///     `Body` is a Blake2b hash of the data (if there is a body)
        let messageBytes: Bytes = serverPublicKeyData.bytes
            .appending(nonce.bytes)
            .appending(timestampBytes)
            .appending(method.bytes)
            .appending(path.bytes)
            .appending(bodyHash ?? [])
        
        /// Sign the above message
        guard let signResult: (publicKey: String, signature: Bytes) = sign(messageBytes, for: serverName, using: dependencies) else {
            return nil
        }
        
        updatedRequest.allHTTPHeaderFields = (request.allHTTPHeaderFields ?? [:])
            .updated(with: [
                Header.sogsPubKey.rawValue: signResult.publicKey,
                Header.sogsTimestamp.rawValue: "\(timestamp)",
                Header.sogsNonce.rawValue: nonce.base64EncodedString(),
                Header.sogsSignature.rawValue: signResult.signature.toBase64()
            ])
        
        return updatedRequest
    }
    
    // MARK: - Convenience
    
    private static func send<T: Encodable>(_ request: Request<T>, using dependencies: Dependencies = Dependencies()) -> Promise<(OnionRequestResponseInfoType, Data?)> {
        guard let url: URL = request.url else { return Promise(error: Error.invalidURL) }
        
        var urlRequest: URLRequest = URLRequest(url: url)
        urlRequest.httpMethod = request.method.rawValue
        urlRequest.allHTTPHeaderFields = request.headers
            .setting(.room, request.room)   // TODO: Is this needed anymore? Add at the request level?.
            .toHTTPHeaders()
        
        do {
            urlRequest.httpBody = try request.bodyData()
        }
        catch {
            return Promise(error: Error.parsingFailed)
        }
        
        if request.useOnionRouting {
            guard let publicKey = dependencies.storage.getOpenGroupPublicKey(for: request.server) else {
                return Promise(error: Error.noPublicKey)
            }
            
            if request.isAuthRequired {
                // Attempt to sign the request with the new auth
                guard let signedRequest: URLRequest = sign(urlRequest, for: request.server, with: publicKey, using: dependencies) else {
                    return Promise(error: Error.signingFailed)
                }
                
                // TODO: 'removeAuthToken' as a migration??? (would previously do this when getting a `401`)
                return dependencies.api.sendOnionRequest(signedRequest, to: request.server, with: publicKey)
            }
            
            return dependencies.api.sendOnionRequest(urlRequest, to: request.server, with: publicKey)
        }
        
        preconditionFailure("It's currently not allowed to send non onion routed requests.")
    }
    
    // MARK: -
    // MARK: -
    // MARK: - Legacy Requests (To be removed)
    // TODO: Remove the legacy requests (should be unused once we release - just here for testing)
    
    public static var legacyDefaultRoomsPromise: Promise<[LegacyRoomInfo]>?
    
    // MARK: -- Legacy Auth
    
    @available(*, deprecated, message: "Use request signing instead")
    private static func legacyGetAuthToken(for room: String, on server: String) -> Promise<String> {
        let storage = SNMessagingKitConfiguration.shared.storage

        if let authToken: String = storage.getAuthToken(for: room, on: server) {
            return Promise.value(authToken)
        }
        
        if let authTokenPromise: Promise<String> = legacyAuthTokenPromises.wrappedValue["\(server).\(room)"] {
            return authTokenPromise
        }
        
        let promise: Promise<String> = legacyRequestNewAuthToken(for: room, on: server)
            .then(on: OpenGroupAPI.workQueue) { legacyClaimAuthToken($0, for: room, on: server) }
            .then(on: OpenGroupAPI.workQueue) { authToken -> Promise<String> in
                let (promise, seal) = Promise<String>.pending()
                storage.write(with: { transaction in
                    storage.setAuthToken(for: room, on: server, to: authToken, using: transaction)
                }, completion: {
                    seal.fulfill(authToken)
                })
                return promise
            }
        
        promise
            .done(on: OpenGroupAPI.workQueue) { _ in
                legacyAuthTokenPromises.wrappedValue["\(server).\(room)"] = nil
            }
            .catch(on: OpenGroupAPI.workQueue) { _ in
                legacyAuthTokenPromises.wrappedValue["\(server).\(room)"] = nil
            }
        
        legacyAuthTokenPromises.wrappedValue["\(server).\(room)"] = promise
        return promise
    }

    @available(*, deprecated, message: "Use request signing instead")
    public static func legacyRequestNewAuthToken(for room: String, on server: String) -> Promise<String> {
        SNLog("Requesting auth token for server: \(server).")
        guard let userKeyPair: ECKeyPair = SNMessagingKitConfiguration.shared.storage.getUserKeyPair() else {
            return Promise(error: Error.generic)
        }
        
        let request: Request = Request(
            server: server,
            room: room,
            endpoint: .legacyAuthTokenChallenge(legacyAuth: true),
            queryParameters: [
                .publicKey: getUserHexEncodedPublicKey()
            ],
            isAuthRequired: false
        )
        
        return legacySend(request).map(on: OpenGroupAPI.workQueue) { _, maybeData in
            guard let data: Data = maybeData else { throw Error.parsingFailed }
            let response = try data.decoded(as: LegacyAuthTokenResponse.self, customError: Error.parsingFailed)
            let symmetricKey = try AESGCM.generateSymmetricKey(x25519PublicKey: response.challenge.ephemeralPublicKey, x25519PrivateKey: userKeyPair.privateKey)
            
            guard let tokenAsData = try? AESGCM.decrypt(response.challenge.ciphertext, with: symmetricKey) else {
                throw Error.decryptionFailed
            }
            
            return tokenAsData.toHexString()
        }
    }

    @available(*, deprecated, message: "Use request signing instead")
    public static func legacyClaimAuthToken(_ authToken: String, for room: String, on server: String) -> Promise<String> {
        let requestBody: LegacyPublicKeyBody = LegacyPublicKeyBody(publicKey: getUserHexEncodedPublicKey())

        guard let body: Data = try? JSONEncoder().encode(requestBody) else {
            return Promise(error: HTTP.Error.invalidJSON)
        }

        let request: Request = Request(
            method: .post,
            server: server,
            room: room,
            endpoint: .legacyAuthTokenClaim(legacyAuth: true),
            headers: [
                // Set explicitly here because is isn't in the database yet at this point
                .authorization: authToken
            ],
            body: body,
            isAuthRequired: false
        )

        return legacySend(request).map(on: OpenGroupAPI.workQueue) { _ in authToken }
    }

    /// Should be called when leaving a group.
    @available(*, deprecated, message: "Use request signing instead")
    public static func legacyDeleteAuthToken(for room: String, on server: String) -> Promise<Void> {
        let request: Request = Request(
            method: .delete,
            server: server,
            room: room,
            endpoint: .legacyAuthToken(legacyAuth: true)
        )
        
        return legacySend(request).map(on: OpenGroupAPI.workQueue) { _ in
            let storage = SNMessagingKitConfiguration.shared.storage
            
            storage.write { transaction in
                storage.removeAuthToken(for: room, on: server, using: transaction)
            }
        }
    }
    
    // MARK: -- Legacy Requests
    
    @available(*, deprecated, message: "Use poll or batch instead")
    public static func legacyCompactPoll(_ server: String) -> Promise<LegacyCompactPollResponse> {
        let storage: SessionMessagingKitStorageProtocol = SNMessagingKitConfiguration.shared.storage
        let rooms: [String] = storage.getAllOpenGroups().values
            .filter { $0.server == server }
            .map { $0.room }
        var getAuthTokenPromises: [String: Promise<String>] = [:]
        let useMessageLimit = (hasPerformedInitialPoll[server] != true && timeSinceLastOpen > OpenGroupAPI.Poller.maxInactivityPeriod)

        hasPerformedInitialPoll[server] = true
        
        if !legacyHasUpdatedLastOpenDate {
            UserDefaults.standard[.lastOpen] = Date()
            legacyHasUpdatedLastOpenDate = true
        }
        
        for room in rooms {
            getAuthTokenPromises[room] = legacyGetAuthToken(for: room, on: server)
        }
        
        let requestBody: LegacyCompactPollBody = LegacyCompactPollBody(
            requests: rooms
                .map { roomId -> LegacyCompactPollBody.Room in
                    LegacyCompactPollBody.Room(
                        id: roomId,
                        fromMessageServerId: (useMessageLimit ? nil :
                            storage.getLastMessageServerID(for: roomId, on: server)
                        ),
                        fromDeletionServerId: (useMessageLimit ? nil :
                            storage.getLastDeletionServerID(for: roomId, on: server)
                        ),
                        legacyAuthToken: nil
                    )
                }
        )
        
        return when(fulfilled: [Promise<String>](getAuthTokenPromises.values))
            .then(on: OpenGroupAPI.workQueue) { _ -> Promise<LegacyCompactPollResponse> in
                let requestBodyWithAuthTokens: LegacyCompactPollBody = LegacyCompactPollBody(
                    requests: requestBody.requests.compactMap { oldRoom -> LegacyCompactPollBody.Room? in
                        guard let authToken: String = getAuthTokenPromises[oldRoom.id]?.value else { return nil }
                        
                        return LegacyCompactPollBody.Room(
                            id: oldRoom.id,
                            fromMessageServerId: oldRoom.fromMessageServerId,
                            fromDeletionServerId: oldRoom.fromDeletionServerId,
                            legacyAuthToken: authToken
                        )
                    }
                )
                
                guard let body: Data = try? JSONEncoder().encode(requestBodyWithAuthTokens) else {
                    return Promise(error: HTTP.Error.invalidJSON)
                }
            
                let request = Request(
                    method: .post,
                    server: server,
                    endpoint: .legacyCompactPoll(legacyAuth: true),
                    body: body,
                    isAuthRequired: false
                )
        
                return legacySend(request)
                    .then(on: OpenGroupAPI.workQueue) { _, maybeData -> Promise<LegacyCompactPollResponse> in
                        guard let data: Data = maybeData else { throw Error.parsingFailed }
                        let response: LegacyCompactPollResponse = try data.decoded(as: LegacyCompactPollResponse.self, customError: Error.parsingFailed)

                        return when(
                            fulfilled: response.results
                                .compactMap { (result: LegacyCompactPollResponse.Result) -> Promise<[LegacyDeletion]>? in
                                    // A 401 means that we didn't provide a (valid) auth token for a route that
                                    // required one. We use this as an indication that the token we're using has
                                    // expired. Note that a 403 has a different meaning; it means that we provided
                                    // a valid token but it doesn't have a high enough permission level for the
                                    // route in question.
                                    guard result.statusCode != 401 else {
                                        storage.writeSync { transaction in
                                            storage.removeAuthToken(for: result.room, on: server, using: transaction)
                                        }
                                        
                                        return nil
                                    }
                                    
                                    return legacyProcess(messages: result.messages, for: result.room, on: server)
                                        .then(on: OpenGroupAPI.workQueue) { _ ->  Promise<[LegacyDeletion]> in
                                            legacyProcess(deletions: result.deletions, for: result.room, on: server)
                                        }
                                }
                        ).then(on: OpenGroupAPI.workQueue) { _ in Promise.value(response) }
                    }
            }
    }
    
    @available(*, deprecated, message: "Use getDefaultRoomsIfNeeded instead")
    public static func legacyGetDefaultRoomsIfNeeded() {
        Storage.shared.write(
            with: { transaction in
                Storage.shared.setOpenGroupPublicKey(for: defaultServer, to: defaultServerPublicKey, using: transaction)
            },
            completion: {
                let promise = attempt(maxRetryCount: 8, recoveringOn: DispatchQueue.main) {
                    OpenGroupAPI.legacyGetAllRooms(from: defaultServer)
                }
                _ = promise.done(on: OpenGroupAPI.workQueue) { items in
                    items.forEach { legacyGetGroupImage(for: $0.id, on: defaultServer).retainUntilComplete() }
                }
                promise.catch(on: OpenGroupAPI.workQueue) { _ in
                    OpenGroupAPI.legacyDefaultRoomsPromise = nil
                }
                legacyDefaultRoomsPromise = promise
            }
        )
    }
    
    @available(*, deprecated, message: "Use rooms(for:) instead")
    public static func legacyGetAllRooms(from server: String) -> Promise<[LegacyRoomInfo]> {
        let request: Request = Request(
            server: server,
            endpoint: .legacyRooms,
            isAuthRequired: false
        )
        
        return legacySend(request)
            .map(on: OpenGroupAPI.workQueue) { _, maybeData in
                guard let data: Data = maybeData else { throw Error.parsingFailed }
                let response: LegacyRoomsResponse = try data.decoded(as: LegacyRoomsResponse.self, customError: Error.parsingFailed)
                
                return response.rooms
            }
    }
    
    @available(*, deprecated, message: "Use room(for:on:) instead")
    public static func legacyGetRoomInfo(for room: String, on server: String) -> Promise<LegacyRoomInfo> {
        let request: Request = Request(
            server: server,
            room: room,
            endpoint: .legacyRoomInfo(room),
            isAuthRequired: false
        )
        
        return legacySend(request)
            .map(on: OpenGroupAPI.workQueue) { _, maybeData in
                guard let data: Data = maybeData else { throw Error.parsingFailed }
                let response: LegacyGetInfoResponse = try data.decoded(as: LegacyGetInfoResponse.self, customError: Error.parsingFailed)
                
                return response.room
            }
    }
    
    @available(*, deprecated, message: "Use roomImage(_:for:on:) instead")
    public static func legacyGetGroupImage(for room: String, on server: String) -> Promise<Data> {
        // Normally the image for a given group is stored with the group thread, so it's only
        // fetched once. However, on the join open group screen we show images for groups the
        // user * hasn't * joined yet. We don't want to re-fetch these images every time the
        // user opens the app because that could slow the app down or be data-intensive. So
        // instead we assume that these images don't change that often and just fetch them once
        // a week. We also assume that they're all fetched at the same time as well, so that
        // we only need to maintain one date in user defaults. On top of all of this we also
        // don't double up on fetch requests by storing the existing request as a promise if
        // there is one.
        let lastOpenGroupImageUpdate: Date? = UserDefaults.standard[.lastOpenGroupImageUpdate]
        let now: Date = Date()
        let timeSinceLastUpdate: TimeInterval = (given(lastOpenGroupImageUpdate) { now.timeIntervalSince($0) } ?? .greatestFiniteMagnitude)
        let updateInterval: TimeInterval = (7 * 24 * 60 * 60)
        
        if let data = Storage.shared.getOpenGroupImage(for: room, on: server), server == defaultServer, timeSinceLastUpdate < updateInterval {
            return Promise.value(data)
        }
        
        if let promise = legacyGroupImagePromises["\(server).\(room)"] {
            return promise
        }
        
        let request: Request = Request(
            server: server,
            room: room,
            endpoint: .legacyRoomImage(room),
            isAuthRequired: false
        )
        
        let promise: Promise<Data> = legacySend(request).map(on: OpenGroupAPI.workQueue) { _, maybeData in
            guard let data: Data = maybeData else { throw Error.parsingFailed }
            let response: LegacyFileDownloadResponse = try data.decoded(as: LegacyFileDownloadResponse.self, customError: Error.parsingFailed)
            
            if server == defaultServer {
                Storage.shared.write { transaction in
                    Storage.shared.setOpenGroupImage(to: response.data, for: room, on: server, using: transaction)
                }
                UserDefaults.standard[.lastOpenGroupImageUpdate] = now
            }
            
            return response.data
        }
        legacyGroupImagePromises["\(server).\(room)"] = promise
        
        return promise
    }
    
    @available(*, deprecated, message: "Use room(for:on:) instead")
    public static func legacyGetMemberCount(for room: String, on server: String) -> Promise<UInt64> {
        let request: Request = Request(
            server: server,
            room: room,
            endpoint: .legacyMemberCount(legacyAuth: true)
        )
        
        return legacySend(request)
            .map(on: OpenGroupAPI.workQueue) { _, maybeData in
                guard let data: Data = maybeData else { throw Error.parsingFailed }
                let response: LegacyMemberCountResponse = try data.decoded(as: LegacyMemberCountResponse.self, customError: Error.parsingFailed)
                
                let storage = SNMessagingKitConfiguration.shared.storage
                storage.write { transaction in
                    storage.setUserCount(to: response.memberCount, forOpenGroupWithID: "\(server).\(room)", using: transaction)
                }
                
                return response.memberCount
            }
    }
    
    // MARK: - Legacy File Storage
    
    @available(*, deprecated, message: "Use uploadFile(_:fileName:to:on:) instead")
    public static func legacyUpload(_ file: Data, to room: String, on server: String) -> Promise<UInt64> {
        let requestBody: FileUploadBody = FileUploadBody(file: file.base64EncodedString())
        
        guard let body: Data = try? JSONEncoder().encode(requestBody) else {
            return Promise(error: HTTP.Error.invalidJSON)
        }
        
        let request = Request(method: .post, server: server, room: room, endpoint: .legacyFiles, body: body)
        
        return legacySend(request).map(on: OpenGroupAPI.workQueue) { _, maybeData in
            guard let data: Data = maybeData else { throw Error.parsingFailed }
            let response: LegacyFileUploadResponse = try data.decoded(as: LegacyFileUploadResponse.self, customError: Error.parsingFailed)
            
            return response.fileId
        }
    }
    
    @available(*, deprecated, message: "Use downloadFile(_:from:on:) instead")
    public static func legacyDownload(_ file: UInt64, from room: String, on server: String) -> Promise<Data> {
        let request = Request(server: server, room: room, endpoint: .legacyFile(file))
        
        return legacySend(request).map(on: OpenGroupAPI.workQueue) { _, maybeData in
            guard let data: Data = maybeData else { throw Error.parsingFailed }
            let response: LegacyFileDownloadResponse = try data.decoded(as: LegacyFileDownloadResponse.self, customError: Error.parsingFailed)
            
            return response.data
        }
    }
    
    // MARK: - Legacy Message Sending & Receiving
    
    @available(*, deprecated, message: "Use send(_:to:on:whisperTo:whisperMods:with:) instead")
    public static func legacySend(_ message: LegacyOpenGroupMessageV2, to room: String, on server: String, with publicKey: String) -> Promise<LegacyOpenGroupMessageV2> {
        guard let signedMessage = message.sign(with: publicKey) else { return Promise(error: Error.signingFailed) }
        guard let body: Data = try? JSONEncoder().encode(signedMessage) else {
            return Promise(error: Error.parsingFailed)
        }
        let request = Request(method: .post, server: server, room: room, endpoint: .legacyMessages, body: body)
        
        return legacySend(request).map(on: OpenGroupAPI.workQueue) { _, maybeData in
            guard let data: Data = maybeData else { throw Error.parsingFailed }
            let message: LegacyOpenGroupMessageV2 = try data.decoded(as: LegacyOpenGroupMessageV2.self, customError: Error.parsingFailed)
            Storage.shared.write { transaction in
                Storage.shared.addReceivedMessageTimestamp(message.sentTimestamp, using: transaction)
            }
            return message
        }
    }
    
    @available(*, deprecated, message: "Use recentMessages(in:on:) or messagesSince(seqNo:in:on:) instead")
    public static func legacyGetMessages(for room: String, on server: String) -> Promise<[LegacyOpenGroupMessageV2]> {
        let storage = SNMessagingKitConfiguration.shared.storage
        let request: Request = Request(
            server: server,
            room: room,
            endpoint: .legacyMessages,
            queryParameters: [
                .fromServerId: storage.getLastMessageServerID(for: room, on: server).map { String($0) }
            ].compactMapValues { $0 }
        )
        
        return legacySend(request).then(on: OpenGroupAPI.workQueue) { _, maybeData -> Promise<[LegacyOpenGroupMessageV2]> in
            guard let data: Data = maybeData else { throw Error.parsingFailed }
            let messages: [LegacyOpenGroupMessageV2] = try data.decoded(as: [LegacyOpenGroupMessageV2].self, customError: Error.parsingFailed)
            
            return legacyProcess(messages: messages, for: room, on: server)
        }
    }
    
    // MARK: - Legacy Message Deletion
    
    // TODO: No delete method????.
    @available(*, deprecated, message: "Use v4 endpoint instead")
    public static func legacyDeleteMessage(with serverID: Int64, from room: String, on server: String) -> Promise<Void> {
        let request: Request = Request(
            method: .delete,
            server: server,
            room: room,
            endpoint: .legacyMessagesForServer(serverID)
        )
        
        return legacySend(request).map(on: OpenGroupAPI.workQueue) { _ in }
    }
    
    @available(*, deprecated, message: "Use v4 endpoint instead")
    public static func legacyGetDeletedMessages(for room: String, on server: String) -> Promise<[LegacyDeletion]> {
        let storage = SNMessagingKitConfiguration.shared.storage
        
        let request: Request = Request(
            server: server,
            room: room,
            endpoint: .legacyDeletedMessages,
            queryParameters: [
                .fromServerId: storage.getLastDeletionServerID(for: room, on: server).map { String($0) }
            ].compactMapValues { $0 }
        )
        
        return legacySend(request).then(on: OpenGroupAPI.workQueue) { _, maybeData -> Promise<[LegacyDeletion]> in
            guard let data: Data = maybeData else { throw Error.parsingFailed }
            let response: LegacyDeletedMessagesResponse = try data.decoded(as: LegacyDeletedMessagesResponse.self, customError: Error.parsingFailed)
            
            return legacyProcess(deletions: response.deletions, for: room, on: server)
        }
    }
    
    // MARK: - Legacy Moderation
    
    @available(*, deprecated, message: "Use v4 endpoint instead")
    public static func legacyGetModerators(for room: String, on server: String) -> Promise<[String]> {
        let request: Request = Request(
            server: server,
            room: room,
            endpoint: .legacyModerators
        )
        
        return legacySend(request)
            .map(on: OpenGroupAPI.workQueue) { _, maybeData in
                guard let data: Data = maybeData else { throw Error.parsingFailed }
                let response: LegacyModeratorsResponse = try data.decoded(as: LegacyModeratorsResponse.self, customError: Error.parsingFailed)
                
                if var x = self.moderators[server] {
                    x[room] = Set(response.moderators)
                    self.moderators[server] = x
                }
                else {
                    self.moderators[server] = [room: Set(response.moderators)]
                }
                
                return response.moderators
            }
    }
    
    @available(*, deprecated, message: "Use v4 endpoint instead")
    public static func legacyBan(_ publicKey: String, from room: String, on server: String) -> Promise<Void> {
        let requestBody: LegacyPublicKeyBody = LegacyPublicKeyBody(publicKey: getUserHexEncodedPublicKey())
        
        guard let body: Data = try? JSONEncoder().encode(requestBody) else {
            return Promise(error: HTTP.Error.invalidJSON)
        }
        
        let request: Request = Request(
            method: .post,
            server: server,
            room: room,
            endpoint: .legacyBlockList,
            body: body
        )
        
        return legacySend(request).map(on: OpenGroupAPI.workQueue) { _ in }
    }
    
    @available(*, deprecated, message: "Use v4 endpoint instead")
    public static func legacyBanAndDeleteAllMessages(_ publicKey: String, from room: String, on server: String) -> Promise<Void> {
        let requestBody: LegacyPublicKeyBody = LegacyPublicKeyBody(publicKey: getUserHexEncodedPublicKey())
        
        guard let body: Data = try? JSONEncoder().encode(requestBody) else {
            return Promise(error: HTTP.Error.invalidJSON)
        }
        
        let request: Request = Request(
            method: .post,
            server: server,
            room: room,
            endpoint: .legacyBanAndDeleteAll,
            body: body
        )
        
        return legacySend(request).map(on: OpenGroupAPI.workQueue) { _ in }
    }
    
    @available(*, deprecated, message: "Use v4 endpoint instead")
    public static func legacyUnban(_ publicKey: String, from room: String, on server: String) -> Promise<Void> {
        let request: Request = Request(
            method: .delete,
            server: server,
            room: room,
            endpoint: .legacyBlockListIndividual(publicKey)
        )
        
        return legacySend(request).map(on: OpenGroupAPI.workQueue) { _ in }
    }
    
    // MARK: - Processing
    // TODO: Move these methods to the OpenGroupManager? (seems odd for them to be in the API)
    
    @available(*, deprecated, message: "Use v4 endpoint instead")
    private static func legacyProcess(messages: [LegacyOpenGroupMessageV2]?, for room: String, on server: String) -> Promise<[LegacyOpenGroupMessageV2]> {
        guard let messages: [LegacyOpenGroupMessageV2] = messages, !messages.isEmpty else { return Promise.value([]) }
        
        let storage = SNMessagingKitConfiguration.shared.storage
        let serverID: Int64 = (messages.compactMap { $0.serverID }.max() ?? 0)
        let lastMessageServerID: Int64 = (storage.getLastMessageServerID(for: room, on: server) ?? 0)
        
        if serverID > lastMessageServerID {
            let (promise, seal) = Promise<[LegacyOpenGroupMessageV2]>.pending()
            
            storage.write(
                with: { transaction in
                    storage.setLastMessageServerID(for: room, on: server, to: serverID, using: transaction)
                },
                completion: {
                    seal.fulfill(messages)
                }
            )
            
            return promise
        }
        
        return Promise.value(messages)
    }
    
    @available(*, deprecated, message: "Use v4 endpoint instead")
    private static func legacyProcess(deletions: [LegacyDeletion]?, for room: String, on server: String) -> Promise<[LegacyDeletion]> {
        guard let deletions: [LegacyDeletion] = deletions else { return Promise.value([]) }
        
        let storage = SNMessagingKitConfiguration.shared.storage
        let serverID: Int64 = (deletions.compactMap { $0.id }.max() ?? 0)
        let lastDeletionServerID: Int64 = (storage.getLastDeletionServerID(for: room, on: server) ?? 0)
        
        if serverID > lastDeletionServerID {
            let (promise, seal) = Promise<[LegacyDeletion]>.pending()
            
            storage.write(
                with: { transaction in
                    storage.setLastDeletionServerID(for: room, on: server, to: serverID, using: transaction)
                },
                completion: {
                    seal.fulfill(deletions)
                }
            )
            
            return promise
        }
        
        return Promise.value(deletions)
    }
    
    // MARK: - Legacy Convenience
    
    @available(*, deprecated, message: "Use v4 endpoint instead")
    private static func legacySend(_ request: Request, through api: OnionRequestAPIType.Type = OnionRequestAPI.self) -> Promise<(OnionRequestResponseInfoType, Data?)> {
        guard let url: URL = request.url else { return Promise(error: Error.invalidURL) }
        
        var urlRequest: URLRequest = URLRequest(url: url)
        urlRequest.httpMethod = request.method.rawValue
        urlRequest.allHTTPHeaderFields = request.headers
            .setting(.room, request.room)   // TODO: Is this needed anymore? Add at the request level?.
            .toHTTPHeaders()
        urlRequest.httpBody = request.body
        
        if request.useOnionRouting {
            guard let publicKey = SNMessagingKitConfiguration.shared.storage.getOpenGroupPublicKey(for: request.server) else {
                return Promise(error: Error.noPublicKey)
            }
            
            if request.isAuthRequired {
                // Because legacy auth happens on a per-room basis, we need to have a room to
                // make an authenticated request
                guard let room = request.room else {
                    return api.sendOnionRequest(urlRequest, to: request.server, using: .v3, with: publicKey)
                }
                
                return legacyGetAuthToken(for: room, on: request.server)
                    .then(on: OpenGroupAPI.workQueue) { authToken -> Promise<(OnionRequestResponseInfoType, Data?)> in
                        urlRequest.setValue(authToken, forHTTPHeaderField: Header.authorization.rawValue)
                        
                        let promise = api.sendOnionRequest(urlRequest, to: request.server, using: .v3, with: publicKey)
                        promise.catch(on: OpenGroupAPI.workQueue) { error in
                            // A 401 means that we didn't provide a (valid) auth token for a route
                            // that required one. We use this as an indication that the token we're
                            // using has expired. Note that a 403 has a different meaning; it means
                            // that we provided a valid token but it doesn't have a high enough
                            // permission level for the route in question.
                            if case OnionRequestAPI.Error.httpRequestFailedAtDestination(let statusCode, _, _) = error, statusCode == 401 {
                                let storage = SNMessagingKitConfiguration.shared.storage
                                
                                storage.writeSync { transaction in
                                    storage.removeAuthToken(for: room, on: request.server, using: transaction)
                                }
                            }
                        }
                        
                        return promise
                    }
            }
            
            return api.sendOnionRequest(urlRequest, to: request.server, using: .v3, with: publicKey)
        }
        
        preconditionFailure("It's currently not allowed to send non onion routed requests.")
    }
}