how can i update my avtar - login user avtar (photo) in xmpp using iphone SDK (XMPPStream) ?
i have XMPPvCardAvatarModule (but not having method description) so not able to get how to use its methods to update avtar(image) ?? Can any one post sample code & links to understand that, i am stuck with this problem !! Thanks.
Most folks use XEP-153 for avatars. But please be careful implementing this. If you get your hash logic wrong, and you don't do negative caching, it wreaks havoc on the network as your client constantly re-queries for vcards that will never match the hash they're given. Please do NOT set your client to send vcard queries to everyone on your roster every time you log in -- please heed the MUST in the XEP for caching avatars, or do NOT implement this feature.
Also, please be aware the community hopes to one day move to XEP-84, which has the potential to be more efficient in certain cases.
Related
I'm developing an app that's pretty simple, and the important part of it is the content, which consists of lots of info that has been gathered over many years. I want to format it in a nice way to show to the user.
When the user downloads the app and first loads it, it goes to the server to get the whole database into the phone. Then, he can see the important items, and sort/filter through them. To avoid somebody taking my database, I'll use a SSL connection. I know if they want they could use the app to see every piece of content one by one, but there's nothing to do about that.
The thing is: I have the data in the cloud (mine). I can securely download it using an SSL connection (any other ideas to secure the transfer?). When I get it here, I'll save it in a db (Core Data is the obvious choice).
How can I secure the data in the internal database, so if the app is hacked, someone cannot access the db? I would put it in the keychain but it's a rather large db for that and it's not that important. (It's not sensible info, just info I don't want anybody to get massively.)
The other thing I could do is to never store anything in the device and have the user always making calls to the cloud, but I think this would be too time consuming. And just give him the option to save their favorite picks to the device. But that's too time consuming and there is the sync issue.
This is a reference I looked up about a similar issue, without the part I'm asking answered:
How to encrypt iPhone upload and download of info?
Basically, the only choice is to use SqlCipher. Of course, you have to port it to iPhone yourself (unless someone else has posted a port since last I looked). But it's not an insurmountable task.
Of course, even with SqlCipher you have the challenge of storing the key somehow. There's no really secure way to do this -- you have to use some form of "security by obscurity".
Why not just have some private key info stored in the code, and then when you want to download the database just have it query the server with the key? That way you wan't need to worry about SSL or encryption in the downloading part. In regards to storing it I agree with Hot Licks, SqlCipher appears to be the best and only option. However watch out for encryption, as you will have to declare it to apple and get all kinds of export permits (http://stackoverflow.com/questions/2135081/does-my-application-contain-encryption).
Hope this helps,
Jonathan
In our iPhone app , we offer email templates populated with DB. also user can create their own templates.
Say for example , i have my own templates created over 500 entries to use
here i need to know the possibility on the below things since my client asks me.
If i want to to send my templates stored into my DB to myfriend who uses the same application.( So my friend does not have to create the templets on his own , he can use mine)
Can that user be able to load those template details ( DB information ) into his app? (like posting the db contents to server and the same content can be loaded into his app using link)
I think it cant be done but i would like to know opinions and views to convey this to my superior.
Thanks a lot
This could help: How do I associate file types with an iPhone application?
Okay, well.. It's possible to do what you are trying to do.
You would need to
Serialize the data that's stored in the DB
Figure out a way to send this data to the server/as an attachment in an email over to your friend.
So from that point of view,
Doing the first is pretty simple. If its all just string content, you can serialize it into an XML/JSON. There are a lot of ways out there that converts objects into strings or bytes to send them over the network anywhere you please.
The second needs support from the server. You would need a server that can identify the applications from one another. ie. yours from that of your friend's. It should then be made to handle the serialized content you are planning to send over and then figure out a way to send it to the friend. maybe a push notification? You could possibly look at Urban Airship or some such offering for doing this incase you dont have an existing server.
Or, you can cut yourself all the work and see if your workflow can fit into this
http://www.raywenderlich.com/1980/how-to-import-and-export-app-data-via-email-in-your-ios-app
I'm trying to send data from my application to a webserver.
The catch is that I want to encrypt the sent data and also make sure it comes from my application. (From what I've read so far it's easy to decrypt the data if it's not sent via HTTPS. On the unique application I didn't find anything except the Application ID Apple provides for each application but I don't know how that works).
The data sent are various highscores and achievements that the user can enable. The thing is that the user doesn't have to type in anything but his username and having that associated with the UDID it should be enough.
But how to make sure it's from my application?
Edit:After reading some responses around here I still didn't understand something:
If someone extracts the IPA and reverse engineers it wouldn't he have access to all my .h and .m so he can look up anything in there?
You could generate a client certificate for the iPhone app, and use mutual authentication for your SSL handshake. Then you know that data submitted to the server come from a particular user of the app, and that your app is communicating with the correct server.
Regarding your edited update, yes if someone reverse-engineeres your app they can probably work out how the high-scores are protected. But seriously, how much trouble do you expect most people to go to in order to fake a high score in a game? Are you offering a cash prize or something?
If you are using HTTPS then you can just put an identifier key in your POST to the web server, either as a field or perhaps an HTTP header that identifies your app. The entire connection is encrypted so it will be protected. If you do this you will want to encrypt the key even in your binary and decrypt it as you send it over the connection, that way no one will be able to pull it out with a hex editor.
Another approach if all you want is to know that the data comes from an authentic instance of your application is to use message authentication codes (MAC). I leave deciding how strongly the key needs protecting as an exercise to the reader - you know your security requirements better than I do.
You can use CommonCrypto - part of the iOS SDK since forever - to actually generate the MAC.
Okay, I want to have an app that takes phone numbers from an online database and displays them in a table view. When the user is not online, I want them to still be able to see the numbers they already got from the database in the table view. If the user manages to go back online, the database updates the view. My question is, is this possible to do and if so, what's the best way to approach it? (bit of a newbie, please help me out)
There are many ways to do what you are asking, depending on the complexity of what you are after.
Could I suggest the following steps (I'm not sure which ones you can do, and which ones you are having trouble with).
Connect to the server and retrieve the list of phone numbers
If the database has a web server front end this might be as simple as sending a get request to the server (see NSURLConnection) and parsing the result. Otherwise you will need to know/tell us what type database you are using.
Store the phone numbers on the device
Use SQLite to store the numbers on the device (See iPhone SQLite Resources)
Check for internet connectivity
Periodically check for internet connectivity, and if a specific time has elapsed since you last polled the server, retry. (See Checking iPhone internet connectivity)
Although you’re probably looking for a native app solution, you can also do this with a web app.
http://diveintohtml5.ep.io/offline.html
I am a new developer iPhone developer, "learning" to be precise. I came across the useful NSUserDefaults (a dictionary in which you can store/restore state even after your application relaunches). Problem with this dictionary will be memory in your case. NSUserDefaults is sort of global to all applications and yours may spoil the show for other innocent applications (like Weather :D ).
To work around this, you can have your application declare a property list file where you store a few numbers (best practise would be the most recent but you can use any selector of choice). Look for an appropriate time in your run loop to store these numbers into your property file and load them when the application starts.
How do I send a push notification to a device at regular intervals, e.g. every x minutes?
[Tapping this out on my phone - hopefully the formatting is all right - I'll fix it later if necessary. Apologies in advance if it's messy...]
As others have pointed out, you'll want to look at Apple's docs for how to do this (it's not the most straightforward process in the world)..
What I wanted to contribute is the suggestion that you check this out: http://urbanairship.com/push/
Urban Airship takes care of a ton of the hassle you'd otherwise have to deal with yourself. You still need to be registered with Apple for sending push-notifications, but if you use Urban Airship's bits, they'll provide you hosting for your notification service, reporting, a management console, and a REST API for interacting with the system. They even have a scheduling component, and I'd bet that it would solve your problem here with just a few simple calls.
These guys are local to me (I live in Portland, Oregon), and I've seen a few of their demos - it's slick.
There are other features, but I think the ones listed are compelling enough to at least give it a look :)
It's obviously not required - you could do all this on your own, but the service they're offering is insanely good and affordable.
At the time of this writing, they have an "indie" account that will let you send 100,000 notifications through them a month for free. After that it's $.001 per notification (again, this appears to be per month - so, if I understand the terms right, you get 100,000 notifications for free each month, which is just awesome).
You can see the different pricing options here: http://urbanairship.com/plans-and-pricing/
I'm not affiliated with these guys in any way beyond having chatted with them at local geek events and having been offered, along with other attendees, free alcoholic beverages. But, as I don't drink, I'd like to think my judgment hasn't been affected by the psychology of gifting (fascinating subject).
So... it's worth it to at least take a look at what they're offering. And if anybody else has links to similar services, post 'em in the comments. Apple has given devs an amazing platform to play with, but they haven't made it very easy in places - it's cool to see shops like this making it more accessible.
In my opinion, of course :)
There is no "built in" way to do this just using APNS. You would have to have your push provider code do this for you.
In my case my push provider pulls rows from a DB table and sends them at the time specified. I would just insert another row back into the DB after I sent a message.
As for limit, everyone I have talked to says that there is in effect no limit.
chris.