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269 lines
16 KiB
Swift
269 lines
16 KiB
Swift
import PromiseKit
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@objc(LKPublicChatAPI)
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public final class LokiPublicChatAPI : LokiDotNetAPI {
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private static var moderators: [String:[UInt64:Set<String>]] = [:] // Server URL to (channel ID to set of moderator IDs)
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// MARK: Settings
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private static let fallbackBatchCount = 256
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private static let maxRetryCount: UInt = 8
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// MARK: Public Chat
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@objc private static let channelInfoType = "net.patter-app.settings"
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@objc public static let publicChatMessageType = "network.loki.messenger.publicChat"
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// MARK: Convenience
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private static var userDisplayName: String {
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return SSKEnvironment.shared.contactsManager.displayName(forPhoneIdentifier: userHexEncodedPublicKey) ?? "Anonymous"
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}
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// MARK: Database
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override internal class var authTokenCollection: String { "LokiGroupChatAuthTokenCollection" } // Should ideally be LokiPublicChatAuthTokenCollection
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private static let lastMessageServerIDCollection = "LokiGroupChatLastMessageServerIDCollection" // Should ideally be LokiPublicChatLastMessageServerIDCollection
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private static let lastDeletionServerIDCollection = "LokiGroupChatLastDeletionServerIDCollection" // Should ideally be LokiPublicChatLastDeletionServerIDCollection
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private static func getLastMessageServerID(for group: UInt64, on server: String) -> UInt? {
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var result: UInt? = nil
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storage.dbReadConnection.read { transaction in
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result = transaction.object(forKey: "\(server).\(group)", inCollection: lastMessageServerIDCollection) as! UInt?
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}
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return result
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}
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private static func setLastMessageServerID(for group: UInt64, on server: String, to newValue: UInt64) {
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storage.dbReadWriteConnection.readWrite { transaction in
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transaction.setObject(newValue, forKey: "\(server).\(group)", inCollection: lastMessageServerIDCollection)
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}
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}
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private static func removeLastMessageServerID(for group: UInt64, on server: String) {
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storage.dbReadWriteConnection.readWrite { transaction in
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transaction.removeObject(forKey: "\(server).\(group)", inCollection: lastMessageServerIDCollection)
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}
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}
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private static func getLastDeletionServerID(for group: UInt64, on server: String) -> UInt? {
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var result: UInt? = nil
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storage.dbReadConnection.read { transaction in
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result = transaction.object(forKey: "\(server).\(group)", inCollection: lastDeletionServerIDCollection) as! UInt?
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}
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return result
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}
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private static func setLastDeletionServerID(for group: UInt64, on server: String, to newValue: UInt64) {
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storage.dbReadWriteConnection.readWrite { transaction in
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transaction.setObject(newValue, forKey: "\(server).\(group)", inCollection: lastDeletionServerIDCollection)
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}
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}
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private static func removeLastDeletionServerID(for group: UInt64, on server: String) {
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storage.dbReadWriteConnection.readWrite { transaction in
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transaction.removeObject(forKey: "\(server).\(group)", inCollection: lastDeletionServerIDCollection)
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}
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}
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// MARK: Public API
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public static func getMessages(for channel: UInt64, on server: String) -> Promise<[LokiPublicChatMessage]> {
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print("[Loki] Getting messages for public chat channel with ID: \(channel) on server: \(server).")
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var queryParameters = "include_annotations=1"
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if let lastMessageServerID = getLastMessageServerID(for: channel, on: server) {
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queryParameters += "&since_id=\(lastMessageServerID)"
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} else {
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queryParameters += "&count=-\(fallbackBatchCount)"
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}
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let url = URL(string: "\(server)/channels/\(channel)/messages?\(queryParameters)")!
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let request = TSRequest(url: url)
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return TSNetworkManager.shared().makePromise(request: request).map { $0.responseObject }.map { rawResponse in
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guard let json = rawResponse as? JSON, let rawMessages = json["data"] as? [JSON] else {
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print("[Loki] Couldn't parse messages for public chat channel with ID: \(channel) on server: \(server) from: \(rawResponse).")
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throw Error.parsingFailed
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}
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return rawMessages.flatMap { message in
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let isDeleted = (message["is_deleted"] as? Int == 1)
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guard !isDeleted else { return nil }
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guard let annotations = message["annotations"] as? [JSON], let annotation = annotations.first, let value = annotation["value"] as? JSON,
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let serverID = message["id"] as? UInt64, let hexEncodedSignatureData = value["sig"] as? String, let signatureVersion = value["sigver"] as? UInt64,
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let body = message["text"] as? String, let user = message["user"] as? JSON, let hexEncodedPublicKey = user["username"] as? String,
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let timestamp = value["timestamp"] as? UInt64 else {
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print("[Loki] Couldn't parse message for public chat channel with ID: \(channel) on server: \(server) from: \(message).")
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return nil
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}
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let displayName = user["name"] as? String ?? NSLocalizedString("Anonymous", comment: "")
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let lastMessageServerID = getLastMessageServerID(for: channel, on: server)
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if serverID > (lastMessageServerID ?? 0) { setLastMessageServerID(for: channel, on: server, to: serverID) }
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let quote: LokiPublicChatMessage.Quote?
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if let quoteAsJSON = value["quote"] as? JSON, let quotedMessageTimestamp = quoteAsJSON["id"] as? UInt64, let quoteeHexEncodedPublicKey = quoteAsJSON["author"] as? String, let quotedMessageBody = quoteAsJSON["text"] as? String {
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let quotedMessageServerID = message["reply_to"] as? UInt64
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quote = LokiPublicChatMessage.Quote(quotedMessageTimestamp: quotedMessageTimestamp, quoteeHexEncodedPublicKey: quoteeHexEncodedPublicKey, quotedMessageBody: quotedMessageBody, quotedMessageServerID: quotedMessageServerID)
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} else {
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quote = nil
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}
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let signature = LokiPublicChatMessage.Signature(data: Data(hex: hexEncodedSignatureData), version: signatureVersion)
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let result = LokiPublicChatMessage(serverID: serverID, hexEncodedPublicKey: hexEncodedPublicKey, displayName: displayName, body: body, type: publicChatMessageType, timestamp: timestamp, quote: quote, signature: signature)
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guard result.hasValidSignature() else {
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print("[Loki] Ignoring public chat message with invalid signature.")
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return nil
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}
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return result
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}.sorted { $0.timestamp < $1.timestamp }
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}
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}
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public static func sendMessage(_ message: LokiPublicChatMessage, to channel: UInt64, on server: String) -> Promise<LokiPublicChatMessage> {
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guard let signedMessage = message.sign(with: userKeyPair.privateKey) else { return Promise(error: Error.signingFailed) }
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return getAuthToken(for: server).then { token -> Promise<LokiPublicChatMessage> in
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print("[Loki] Sending message to public chat channel with ID: \(channel) on server: \(server).")
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let url = URL(string: "\(server)/channels/\(channel)/messages")!
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let parameters = signedMessage.toJSON()
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let request = TSRequest(url: url, method: "POST", parameters: parameters)
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request.allHTTPHeaderFields = [ "Content-Type" : "application/json", "Authorization" : "Bearer \(token)" ]
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let displayName = userDisplayName
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return TSNetworkManager.shared().makePromise(request: request).map { $0.responseObject }.map { rawResponse in
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// ISO8601DateFormatter doesn't support milliseconds before iOS 11
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let dateFormatter = DateFormatter()
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dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
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guard let json = rawResponse as? JSON, let messageAsJSON = json["data"] as? JSON, let serverID = messageAsJSON["id"] as? UInt64, let body = messageAsJSON["text"] as? String,
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let dateAsString = messageAsJSON["created_at"] as? String, let date = dateFormatter.date(from: dateAsString) else {
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print("[Loki] Couldn't parse message for public chat channel with ID: \(channel) on server: \(server) from: \(rawResponse).")
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throw Error.parsingFailed
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}
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let timestamp = UInt64(date.timeIntervalSince1970) * 1000
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return LokiPublicChatMessage(serverID: serverID, hexEncodedPublicKey: userHexEncodedPublicKey, displayName: displayName, body: body, type: publicChatMessageType, timestamp: timestamp, quote: signedMessage.quote, signature: signedMessage.signature)
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}
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}.recover { error -> Promise<LokiPublicChatMessage> in
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if let error = error as? NetworkManagerError, error.statusCode == 401 {
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print("[Loki] Group chat auth token for: \(server) expired; dropping it.")
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storage.dbReadWriteConnection.removeObject(forKey: server, inCollection: authTokenCollection)
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}
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throw error
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}.retryingIfNeeded(maxRetryCount: maxRetryCount).map { message in
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Analytics.shared.track("Group Message Sent")
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return message
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}.recover { error -> Promise<LokiPublicChatMessage> in
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Analytics.shared.track("Failed to Send Group Message")
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throw error
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}
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}
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public static func getDeletedMessageServerIDs(for channel: UInt64, on server: String) -> Promise<[UInt64]> {
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print("[Loki] Getting deleted messages for public chat channel with ID: \(channel) on server: \(server).")
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let queryParameters: String
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if let lastDeletionServerID = getLastDeletionServerID(for: channel, on: server) {
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queryParameters = "since_id=\(lastDeletionServerID)"
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} else {
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queryParameters = "count=\(fallbackBatchCount)"
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}
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let url = URL(string: "\(server)/loki/v1/channel/\(channel)/deletes?\(queryParameters)")!
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let request = TSRequest(url: url)
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return TSNetworkManager.shared().makePromise(request: request).map { $0.responseObject }.map { rawResponse in
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guard let json = rawResponse as? JSON, let deletions = json["data"] as? [JSON] else {
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print("[Loki] Couldn't parse deleted messages for public chat channel with ID: \(channel) on server: \(server) from: \(rawResponse).")
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throw Error.parsingFailed
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}
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return deletions.flatMap { deletion in
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guard let serverID = deletion["id"] as? UInt64, let messageServerID = deletion["message_id"] as? UInt64 else {
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print("[Loki] Couldn't parse deleted message for public chat channel with ID: \(channel) on server: \(server) from: \(deletion).")
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return nil
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}
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let lastDeletionServerID = getLastDeletionServerID(for: channel, on: server)
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if serverID > (lastDeletionServerID ?? 0) { setLastDeletionServerID(for: channel, on: server, to: serverID) }
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return messageServerID
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}
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}
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}
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public static func deleteMessage(with messageID: UInt, for channel: UInt64, on server: String, isSentByUser: Bool) -> Promise<Void> {
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return getAuthToken(for: server).then { token -> Promise<Void> in
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let isModerationRequest = !isSentByUser
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print("[Loki] Deleting message with ID: \(messageID) for public chat channel with ID: \(channel) on server: \(server) (isModerationRequest = \(isModerationRequest)).")
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let urlAsString = isSentByUser ? "\(server)/channels/\(channel)/messages/\(messageID)" : "\(server)/loki/v1/moderation/message/\(messageID)"
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let url = URL(string: urlAsString)!
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let request = TSRequest(url: url, method: "DELETE", parameters: [:])
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request.allHTTPHeaderFields = [ "Content-Type" : "application/json", "Authorization" : "Bearer \(token)" ]
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return TSNetworkManager.shared().makePromise(request: request).done { result -> Void in
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print("[Loki] Deleted message with ID: \(messageID) on server: \(server).")
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}.retryingIfNeeded(maxRetryCount: maxRetryCount)
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}
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}
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public static func getModerators(for channel: UInt64, on server: String) -> Promise<Set<String>> {
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let url = URL(string: "\(server)/loki/v1/channel/\(channel)/get_moderators")!
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let request = TSRequest(url: url)
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return TSNetworkManager.shared().makePromise(request: request).map { $0.responseObject }.map { rawResponse in
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guard let json = rawResponse as? JSON, let moderators = json["moderators"] as? [String] else {
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print("[Loki] Couldn't parse moderators for public chat channel with ID: \(channel) on server: \(server) from: \(rawResponse).")
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throw Error.parsingFailed
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}
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let moderatorAsSet = Set(moderators);
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if self.moderators.keys.contains(server) {
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self.moderators[server]![channel] = moderatorAsSet
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} else {
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self.moderators[server] = [ channel : moderatorAsSet ]
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}
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return moderatorAsSet
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}
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}
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@objc (isUserModerator:forGroup:onServer:)
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public static func isUserModerator(_ hexEncodedPublicString: String, for channel: UInt64, on server: String) -> Bool {
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return moderators[server]?[channel]?.contains(hexEncodedPublicString) ?? false
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}
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public static func setDisplayName(to newDisplayName: String?, on server: String) -> Promise<Void> {
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print("[Loki] Updating display name on server: \(server).")
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return getAuthToken(for: server).then { token -> Promise<Void> in
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let parameters: JSON = [ "name" : (newDisplayName ?? "") ]
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let url = URL(string: "\(server)/users/me")!
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let request = TSRequest(url: url, method: "PATCH", parameters: parameters)
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request.allHTTPHeaderFields = [ "Content-Type" : "application/json", "Authorization" : "Bearer \(token)" ]
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return TSNetworkManager.shared().makePromise(request: request).map { _ in }.recover { error in
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print("Couldn't update display name due to error: \(error).")
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throw error
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}
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}.retryingIfNeeded(maxRetryCount: 3)
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}
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public static func getInfo(for channel: UInt64, on server: String) -> Promise<LokiPublicChatInfo> {
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let url = URL(string: "\(server)/channels/\(channel)?include_annotations=1")!
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let request = TSRequest(url: url)
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return TSNetworkManager.shared().makePromise(request: request).map { $0.responseObject }.map { rawResponse in
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guard let json = rawResponse as? JSON,
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let data = json["data"] as? JSON,
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let annotations = data["annotations"] as? [JSON],
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let annotation = annotations.first,
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let info = annotation["value"] as? JSON,
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let displayName = info["name"] as? String else {
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print("[Loki] Couldn't parse info for public chat channel with ID: \(channel) on server: \(server) from: \(rawResponse).")
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throw Error.parsingFailed
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}
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return LokiPublicChatInfo(displayName: displayName)
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}
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}
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public static func resetLastMessageCache(for group: UInt64, on server: String) {
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removeLastMessageServerID(for: group, on: server)
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removeLastDeletionServerID(for: group, on: server)
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}
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// MARK: Public API (Obj-C)
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@objc(getMessagesForGroup:onServer:)
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public static func objc_getMessages(for group: UInt64, on server: String) -> AnyPromise {
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return AnyPromise.from(getMessages(for: group, on: server))
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}
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@objc(sendMessage:toGroup:onServer:)
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public static func objc_sendMessage(_ message: LokiPublicChatMessage, to group: UInt64, on server: String) -> AnyPromise {
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return AnyPromise.from(sendMessage(message, to: group, on: server))
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}
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@objc(deleteMessageWithID:forGroup:onServer:isSentByUser:)
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public static func objc_deleteMessage(with messageID: UInt, for group: UInt64, on server: String, isSentByUser: Bool) -> AnyPromise {
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return AnyPromise.from(deleteMessage(with: messageID, for: group, on: server, isSentByUser: isSentByUser))
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}
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@objc(setDisplayName:on:)
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public static func objc_setDisplayName(to newDisplayName: String?, on server: String) -> AnyPromise {
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return AnyPromise.from(setDisplayName(to: newDisplayName, on: server))
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}
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}
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