266 lines
15 KiB
Swift
266 lines
15 KiB
Swift
import PromiseKit
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@objc(LKGroupChatAPI)
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public final class LokiGroupChatAPI : NSObject {
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private static let storage = OWSPrimaryStorage.shared()
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// MARK: Settings
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private static let fallbackBatchCount = 40
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private static let maxRetryCount: UInt = 4
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// MARK: Public Chat
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@objc public static let publicChatServer = "https://chat.lokinet.org"
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@objc public static let publicChatMessageType = "network.loki.messenger.publicChat"
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@objc public static let publicChatServerID: UInt = 1
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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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private static var userKeyPair: ECKeyPair {
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return OWSIdentityManager.shared().identityKeyPair()!
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}
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private static var userHexEncodedPublicKey: String {
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return userKeyPair.hexEncodedPublicKey
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}
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// MARK: Error
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public enum Error : Swift.Error {
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case tokenParsingFailed, tokenDecryptionFailed, messageParsingFailed, jsonParsingFailed
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}
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// MARK: Database
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private static let authTokenCollection = "LokiGroupChatAuthTokenCollection"
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private static let lastMessageServerIDCollection = "LokiGroupChatLastMessageServerIDCollection"
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private static let firstMessageServerIDCollection = "LokiGroupChatFirstMessageServerIDCollection"
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private static func getAuthTokenFromDatabase(for server: String) -> String? {
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var result: String? = nil
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storage.dbReadConnection.read { transaction in
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result = transaction.object(forKey: server, inCollection: authTokenCollection) as! String?
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}
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return result
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}
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private static func setAuthToken(for server: String, to newValue: String) {
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storage.dbReadWriteConnection.readWrite { transaction in
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transaction.setObject(newValue, forKey: server, inCollection: authTokenCollection)
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}
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}
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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 getFirstMessageServerID(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: firstMessageServerIDCollection) as! UInt?
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}
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return result
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}
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private static func setFirstMessageServerID(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: firstMessageServerIDCollection)
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}
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}
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// MARK: Private API
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private static func requestNewAuthToken(for server: String) -> Promise<String> {
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print("[Loki] Requesting group chat auth token for server: \(server).")
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let queryParameters = "pubKey=\(userHexEncodedPublicKey)"
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let url = URL(string: "\(server)/loki/v1/get_challenge?\(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 base64EncodedChallenge = json["cipherText64"] as? String, let base64EncodedServerPublicKey = json["serverPubKey64"] as? String,
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let challenge = Data(base64Encoded: base64EncodedChallenge), var serverPublicKey = Data(base64Encoded: base64EncodedServerPublicKey) else {
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throw Error.tokenParsingFailed
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}
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// Discard the "05" prefix if needed
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if (serverPublicKey.count == 33) {
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let hexEncodedServerPublicKey = serverPublicKey.hexadecimalString
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serverPublicKey = Data.data(fromHex: hexEncodedServerPublicKey.substring(from: 2))!
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}
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// The challenge is prefixed by the 16 bit IV
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guard let tokenAsData = try? DiffieHellman.decrypt(challenge, publicKey: serverPublicKey, privateKey: userKeyPair.privateKey),
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let token = String(bytes: tokenAsData, encoding: .utf8) else {
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throw Error.tokenDecryptionFailed
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}
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return token
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}
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}
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private static func submitAuthToken(_ token: String, for server: String) -> Promise<String> {
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print("[Loki] Submitting group chat auth token for server: \(server).")
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let url = URL(string: "\(server)/loki/v1/submit_challenge")!
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let parameters = [ "pubKey" : userHexEncodedPublicKey, "token" : token ]
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let request = TSRequest(url: url, method: "POST", parameters: parameters)
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return TSNetworkManager.shared().makePromise(request: request).map { _ in token }
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}
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private static func getAuthToken(for server: String) -> Promise<String> {
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if let token = getAuthTokenFromDatabase(for: server) {
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return Promise.value(token)
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} else {
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return requestNewAuthToken(for: server).then { submitAuthToken($0, for: server) }.map { token -> String in
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setAuthToken(for: server, to: token)
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return token
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}
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}
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}
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// MARK: Public API
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public static func getMessages(for group: UInt64, on server: String) -> Promise<[LokiGroupMessage]> {
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print("[Loki] Getting messages for group chat with ID: \(group) on server: \(server).")
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var queryParameters = "include_annotations=1"
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if let lastMessageServerID = getLastMessageServerID(for: group, 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/\(group)/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 group chat with ID: \(group) on server: \(server) from: \(rawResponse).")
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throw Error.messageParsingFailed
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}
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return rawMessages.flatMap { message in
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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 body = message["text"] as? String, let hexEncodedPublicKey = value["source"] as? String, let displayName = value["from"] as? String,
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let timestamp = value["timestamp"] as? UInt64 else {
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print("[Loki] Couldn't parse message for group chat with ID: \(group) on server: \(server) from: \(message).")
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return nil
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}
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let lastMessageServerID = getLastMessageServerID(for: group, on: server)
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let firstMessageServerID = getFirstMessageServerID(for: group, on: server)
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if serverID > (lastMessageServerID ?? 0) { setLastMessageServerID(for: group, on: server, to: serverID) }
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if serverID < (firstMessageServerID ?? UInt.max) { setFirstMessageServerID(for: group, on: server, to: serverID) }
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return LokiGroupMessage(serverID: serverID, hexEncodedPublicKey: hexEncodedPublicKey, displayName: displayName, body: body, type: publicChatMessageType, timestamp: timestamp)
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}
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}
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}
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public static func sendMessage(_ message: LokiGroupMessage, to group: UInt64, on server: String) -> Promise<LokiGroupMessage> {
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return getAuthToken(for: server).then { token -> Promise<LokiGroupMessage> in
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print("[Loki] Sending message to group chat with ID: \(group) on server: \(server).")
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let url = URL(string: "\(server)/channels/\(group)/messages")!
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let parameters = message.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 group chat with ID: \(group) on server: \(server) from: \(rawResponse).")
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throw Error.messageParsingFailed
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}
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let timestamp = UInt64(date.timeIntervalSince1970) * 1000
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return LokiGroupMessage(serverID: serverID, hexEncodedPublicKey: userHexEncodedPublicKey, displayName: displayName, body: body, type: publicChatMessageType, timestamp: timestamp)
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}
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}.recover { error -> Promise<LokiGroupMessage> 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)
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}
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public static func getDeletedMessageServerIDs(for group: UInt64, on server: String) -> Promise<[UInt64]> {
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print("[Loki] Getting deleted messages for group chat with ID: \(group) on server: \(server).")
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let firstMessageServerID = getFirstMessageServerID(for: group, on: server) ?? 0
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let queryParameters = "is_deleted=true&since_id=\(firstMessageServerID)"
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let url = URL(string: "\(server)/channels/\(group)/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 deleted messages for group chat with ID: \(group) on server: \(server) from: \(rawResponse).")
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throw Error.messageParsingFailed
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}
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return rawMessages.flatMap { message in
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guard let serverID = message["id"] as? UInt64 else {
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print("[Loki] Couldn't parse deleted message for group chat with ID: \(group) on server: \(server) from: \(message).")
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return nil
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}
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let isDeleted = (message["is_deleted"] as? Bool ?? false)
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return isDeleted ? serverID : nil
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}
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}
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}
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public static func deleteMessageWithServerID(_ messageServerID: UInt, for group: UInt64, on server: String, isOurOwnMessage: Bool = true) -> Promise<Void> {
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return getAuthToken(for: server).then { token -> Promise<Void> in
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let modTag = isOurOwnMessage ? "" : "[Mod]"
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print("[Loki]\(modTag) Deleting message with server ID: \(messageServerID) for group chat with ID: \(group) on server: \(server).")
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let endpoint = isOurOwnMessage ? "\(server)/channels/\(group)/messages/\(messageServerID)" : "\(server)/loki/v1/moderation/message/\(messageServerID)"
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let url = URL(string: endpoint)!
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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).map { result -> Void in
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print("[Loki]\(modTag) Deleted message \(messageServerID) on server \(server).")
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}.recover { error in
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// If we got 404 or 410 then message doesn't exist on the server
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if let error = error as? NetworkManagerError, error.statusCode == 404 || error.statusCode == 410 {
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print("[Loki]\(modTag) Message \(messageServerID) was already deleted on the server.")
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return
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}
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print("[Loki]\(modTag) Failed to delete message \(messageServerID) on server \(server).")
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throw error
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}
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}
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}
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public static func isCurrentUserMod(on server: String) -> Promise<Bool> {
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return getAuthToken(for: server).then { token -> Promise<Bool> in
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let url = URL(string: "\(server)/loki/v1/user_info")!
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let request = TSRequest(url: url)
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request.allHTTPHeaderFields = [ "Content-Type" : "application/json", "Authorization" : "Bearer \(token)" ]
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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 data = json["data"] as? JSON else {
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print("[Loki] Couldn't parse json for user info.")
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throw Error.jsonParsingFailed
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}
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// moderator_status is not set for users that are not mods
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return data["moderator_status"] as? Bool ?? false
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}
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}
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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: LokiGroupMessage, 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 (deleteMessageWithServerID:forGroup:onServer:isOurOwnMessage:)
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public static func objc_deleteMessageWithServerID(_ messageServerID: UInt, for group: UInt64, on server: String, ourMessage: Bool = true) -> AnyPromise {
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return AnyPromise.from(deleteMessageWithServerID(messageServerID, for: group, on: server, isOurOwnMessage: ourMessage))
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}
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}
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