ZeroPush notification setup

Steps

1. Add zeropush to heroku.
2. Get the pre-cert stuff in Apple Dev:
a) register the App ID/bundle ID
b) create a development cert
c) create a distribution cert
d) I think that's it?

3. Now get the aps certs. terminal:
pem -d
4. prod cert in terminal:
pem
5. in terminal:
heroku addons:open zeropush
6. then add the .pem files. PEM, not CER.
7. 

Set up server:
1. install it:
pip install django-zeropush
pip freeze > requirements.txt
SETTINGS.requirements: 'zeropush'

2. add view, url:

from zeropush.models import PushDevice

class NotificationTokenView(APIView):
	def post(self, request, format=None):
		try:
			token_string = request.DATA['token']
			device, created = PushDevice.objects.get_or_create(token=token_string, user=request.user)
			if created:
				return Response(status=status.HTTP_201_CREATED)
			elif device:
				return Response(status=status.HTTP_200_OK)
		except KeyError:
			return Response(status=status.HTTP_404_NOT_FOUND)

	url(r'^notifications/$', NotificationTokenView.as_view()),


3. Add stuff to settings:
ZEROPUSH_AUTH_TOKEN="asdf"
ZEROPUSH_NOTIFY_URL="https://api.zeropush.com/notify"
# though that's optional.

4. push to heroku:
git push heroku master
heroku run python manage.py migrate

Set up iOS:
1. Add delegate to AppDelegate.h:

#import <ZeroPush.h>
@interface AppDelegate : UIResponder <UIApplicationDelegate, ZeroPushDelegate>

2. Add postNotificationToken:
in .h:
- (void)postNotificationToken:(NSString *)token;
in .m:

- (void)postNotificationToken:(NSString *)token;
{
    NSString *urlEnding = @"/api/notifications/";
    
    NSDictionary *parameters = @{@"token": token};
    
    self.manager.requestSerializer = [AFJSONRequestSerializer serializer];
    self.manager.responseSerializer = [AFJSONResponseSerializer serializer];
    
    [self.manager POST:urlEnding parameters:parameters success:^(NSURLSessionDataTask *task, id respo) {
        NSLog(@"Successfully posted token %@ for current user %@", token, self.user.id);
    } failure:^(NSURLSessionDataTask *task, NSError *error) {
        NSLog(@"Error: %@", error.description);
    }];
}

3. Add stuff to didFinishLaunchingWithOptions:

    [[UIApplication sharedApplication] setApplicationIconBadgeNumber:0];
    
#if DEBUG
    [ZeroPush engageWithAPIKey:ZeroPushDevToken delegate:self];
#else
    [ZeroPush engageWithAPIKey:ZeroPushProdToken delegate:self];
#endif
    [[ZeroPush shared] registerForRemoteNotifications];

3.5: add this above @interface in AppDelegate.m:

NSString * const NewMessagesNotification = @"NewMessagesNotification";

4. Add notification methods:

#pragma mark - Notifications

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)tokenData
{
    // Call the convenience method registerDeviceToken, this helps us track device tokens for you
    [[ZeroPush shared] registerDeviceToken:tokenData];
    
    // This would be a good time to save the token and associate it with a user that you want to notify later.
    NSString *tokenString = [ZeroPush deviceTokenFromData:tokenData];
    NSLog(@"%@", tokenString);
    // call notifications endpoint
    [self postNotificationToken:tokenString];
}

- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error
{
    NSLog(@"%@", [error description]);
    //Common reason for errors:
    //  1.) Simulator does not support receiving push notifications
    //  2.) User rejected push alert
    //  3.) "no valid 'aps-environment' entitlement string found for application"
    //      This means your provisioning profile does not have Push Notifications configured. https://zeropush.com/documentation/generating_certificates
}

-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
    // called when Morrow is in the foreground. If we're logged in, get the message feed.
    if (self.user != nil) {
        // get MessagesVC to update the feed.
        [[NSNotificationCenter defaultCenter] postNotificationName:NewMessagesNotification object:self];
    }
}

-(void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forRemoteNotification:(NSDictionary *)userInfo completionHandler:(void (^)())completionHandler
{
    // called when user presses a button on the notification
    
    // the identifier ('category') is the name of a user state.
    if ([identifier isEqualToString:@"CATEGORY_NAME"]) {
        completionHandler();
    }
}