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//
// NCPushNotification.m
// Nextcloud
//
// Created by Marino Faggiana on 26/12/20.
// Copyright © 2020 Marino Faggiana. All rights reserved.
//
// Author Marino Faggiana <marino.faggiana@nextcloud.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#import <UserNotifications/UserNotifications.h>
#import "NCBridgeSwift.h"
#import "NCPushNotification.h"
#import "NCPushNotificationEncryption.h"
#import "NCEndToEndEncryption.h"
#import "CCUtility.h"
@interface NCPushNotification ()
{
AppDelegate *appDelegate;
}
@end
@implementation NCPushNotification
+ (instancetype)shared
{
static NCPushNotification *pushNotification = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
pushNotification = [self new];
pushNotification->appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
});
return pushNotification;
}
- (void)pushNotification
{
if (self.pushKitToken.length == 0) { return; }
for (tableAccount *result in [[NCManageDatabase shared] getAllAccount]) {
NSString *token = [CCUtility getPushNotificationToken:result.account];
if (![token isEqualToString:self.pushKitToken]) {
if (token != nil) {
// unsubscribing + subscribing
[self unsubscribingNextcloudServerPushNotification:result.account urlBase:result.urlBase user:result.user withSubscribing:true];
} else {
[self subscribingNextcloudServerPushNotification:result.account urlBase:result.urlBase user:result.user];
}
}
}
}
- (void)applicationdidReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
NSString *message = [userInfo objectForKey:@"subject"];
if (message) {
NSArray *results = [[NCManageDatabase shared] getAllAccount];
for (tableAccount *result in results) {
if ([CCUtility getPushNotificationPrivateKey:result.account]) {
NSData *decryptionKey = [CCUtility getPushNotificationPrivateKey:result.account];
NSString *decryptedMessage = [[NCPushNotificationEncryption shared] decryptPushNotification:message withDevicePrivateKey:decryptionKey];
if (decryptedMessage) {
NSData *data = [decryptedMessage dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSInteger nid = [[json objectForKey:@"nid"] integerValue];
BOOL delete = [[json objectForKey:@"delete"] boolValue];
BOOL deleteAll = [[json objectForKey:@"delete-all"] boolValue];
if (delete) {
[[NCPushNotification shared] removeNotificationWithNotificationId:nid usingDecryptionKey:decryptionKey];
} else if (deleteAll) {
[[NCPushNotification shared] cleanAllNotifications];
}
}
}
}
}
completionHandler(UIBackgroundFetchResultNoData);
}
- (void)subscribingNextcloudServerPushNotification:(NSString *)account urlBase:(NSString *)urlBase user:(NSString *)user
{
if (appDelegate.account == nil || appDelegate.account.length == 0 || self.pushKitToken.length == 0) { return; }
[[NCPushNotificationEncryption shared] generatePushNotificationsKeyPair:account];
NSString *pushTokenHash = [[NCEndToEndEncryption sharedManager] createSHA512:self.pushKitToken];
NSData *pushPublicKey = [CCUtility getPushNotificationPublicKey:account];
NSString *pushDevicePublicKey = [[NSString alloc] initWithData:pushPublicKey encoding:NSUTF8StringEncoding];
NSString *proxyServerPath = [NCBrandOptions shared].pushNotificationServerProxy;
[[NCCommunication shared] subscribingPushNotificationWithServerUrl:urlBase account:account user:user password:[CCUtility getPassword:account] pushTokenHash:pushTokenHash devicePublicKey:pushDevicePublicKey proxyServerUrl:proxyServerPath customUserAgent:nil addCustomHeaders:nil queue:dispatch_get_main_queue() completionHandler:^(NSString *account, NSString *deviceIdentifier, NSString *signature, NSString *publicKey, NSInteger errorCode, NSString *errorDescription) {
if (errorCode == 0) {
NSString *userAgent = [NSString stringWithFormat:@"%@ (Strict VoIP)", [CCUtility getUserAgent]];
[[NCCommunication shared] subscribingPushProxyWithProxyServerUrl:proxyServerPath pushToken:self.pushKitToken deviceIdentifier:deviceIdentifier signature:signature publicKey:publicKey userAgent:userAgent queue:dispatch_get_main_queue() completionHandler:^(NSInteger errorCode, NSString *errorDescription) {
if (errorCode == 0) {
[[NCCommunicationCommon shared] writeLog:@"Subscribed to Push Notification server & proxy successfully"];
[CCUtility setPushNotificationToken:account token:self.pushKitToken];
[CCUtility setPushNotificationDeviceIdentifier:account deviceIdentifier:deviceIdentifier];
[CCUtility setPushNotificationDeviceIdentifierSignature:account deviceIdentifierSignature:signature];
[CCUtility setPushNotificationSubscribingPublicKey:account publicKey:publicKey];
}
}];
}
}];
}
- (void)unsubscribingNextcloudServerPushNotification:(NSString *)account urlBase:(NSString *)urlBase user:(NSString *)user withSubscribing:(BOOL)subscribing
{
if (appDelegate.account == nil || appDelegate.account.length == 0) { return; }
NSString *deviceIdentifier = [CCUtility getPushNotificationDeviceIdentifier:account];
NSString *signature = [CCUtility getPushNotificationDeviceIdentifierSignature:account];
NSString *publicKey = [CCUtility getPushNotificationSubscribingPublicKey:account];
[[NCCommunication shared] unsubscribingPushNotificationWithServerUrl:urlBase account:account user:user password:[CCUtility getPassword:account] customUserAgent:nil addCustomHeaders:nil queue:dispatch_get_main_queue() completionHandler:^(NSString *account, NSInteger errorCode, NSString *errorDescription) {
if (errorCode == 0) {
NSString *userAgent = [NSString stringWithFormat:@"%@ (Strict VoIP)", [CCUtility getUserAgent]];
NSString *proxyServerPath = [NCBrandOptions shared].pushNotificationServerProxy;
[[NCCommunication shared] unsubscribingPushProxyWithProxyServerUrl:proxyServerPath deviceIdentifier:deviceIdentifier signature:signature publicKey:publicKey userAgent:userAgent queue:dispatch_get_main_queue() completionHandler:^(NSInteger errorCode, NSString *errorDescription) {
if (errorCode == 0) {
[[NCCommunicationCommon shared] writeLog:@"Unsubscribed to Push Notification server & proxy successfully."];
[CCUtility setPushNotificationPublicKey:account data:nil];
[CCUtility setPushNotificationSubscribingPublicKey:account publicKey:nil];
[CCUtility setPushNotificationPrivateKey:account data:nil];
[CCUtility setPushNotificationToken:account token:nil];
[CCUtility setPushNotificationDeviceIdentifier:account deviceIdentifier:nil];
[CCUtility setPushNotificationDeviceIdentifierSignature:account deviceIdentifierSignature:nil];
if (self.pushKitToken != nil && subscribing) {
[self subscribingNextcloudServerPushNotification:account urlBase:urlBase user:user];
}
}
}];
}
}];
}
- (void)cleanAllNotifications
{
[[UNUserNotificationCenter currentNotificationCenter] removeAllDeliveredNotifications];
}
- (void)removeNotificationWithNotificationId:(NSInteger)notificationId usingDecryptionKey:(NSData *)key
{
// Check in pending notifications
[[UNUserNotificationCenter currentNotificationCenter] getPendingNotificationRequestsWithCompletionHandler:^(NSArray<UNNotificationRequest *> * _Nonnull requests) {
for (UNNotificationRequest *notificationRequest in requests) {
NSString *message = [notificationRequest.content.userInfo objectForKey:@"subject"];
NSString *decryptedMessage = [[NCPushNotificationEncryption shared] decryptPushNotification:message withDevicePrivateKey:key];
if (decryptedMessage) {
NSData *data = [decryptedMessage dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSInteger nid = [[json objectForKey:@"nid"] integerValue];
if (nid == notificationId) {
[[UNUserNotificationCenter currentNotificationCenter] removePendingNotificationRequestsWithIdentifiers:@[notificationRequest.identifier]];
}
}
}
}];
// Check in delivered notifications
[[UNUserNotificationCenter currentNotificationCenter] getDeliveredNotificationsWithCompletionHandler:^(NSArray<UNNotification *> * _Nonnull notifications) {
for (UNNotification *notification in notifications) {
NSString *message = [notification.request.content.userInfo objectForKey:@"subject"];
NSString *decryptedMessage = [[NCPushNotificationEncryption shared] decryptPushNotification:message withDevicePrivateKey:key];
if (decryptedMessage) {
NSData *data = [decryptedMessage dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSInteger nid = [[json objectForKey:@"nid"] integerValue];
if (nid == notificationId) {
[[UNUserNotificationCenter currentNotificationCenter] removeDeliveredNotificationsWithIdentifiers:@[notification.request.identifier]];
}
}
}
}];
}
- (void)registerForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
self.pushKitToken = [self stringWithDeviceToken:deviceToken];
[self pushNotification];
}
- (NSString *)stringWithDeviceToken:(NSData *)deviceToken
{
const char *data = [deviceToken bytes];
NSMutableString *token = [NSMutableString string];
for (NSUInteger i = 0; i < [deviceToken length]; i++) {
[token appendFormat:@"%02.2hhX", data[i]];
}
return [token copy];
}
@end
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