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Everybody what's going on this is Caleb with Debb slopes dot com.

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And in this video we're going to safeguard your app from thieves and from people who are trying to commit

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fraud by stealing in-app purchases in your app.

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This is a must do for in-app purchases.

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I don't know about you but if you know anything about the jailbreak iPhone scene you know that it's

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not difficult for people to install an extension on their phone that allows them to basically get in-app

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purchases for free.

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Now if you have verification like what we're going to set up they cannot actually download those purchases

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and you can actually lock them out of the app if you wanted to.

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What we're going to do is we're basically going to take the receipt that's generated when we make a

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purchase on our phone we're going to upload it to iTunes and make sure that it checks out.

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And if it doesn't we're going to basically allow the purchase to say not successful or it's going to

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appear not successful because they're using one of those jailbreak tweaks to steal the in-app purchases

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so this is a way to prevent that from happening to you.

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This is your money maker right.

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This is this could be your business and you don't want people stealing from you.

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So go ahead and pull open your ex code project and we're going to write a really cool function in our

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IP service that's going to upload our app store receipt to iTunes and then we're going to get a response

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back whether or not it's legit.

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So go ahead and write here below restore purchases.

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We're going to create a new function.

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And that function is just going to be called upload receipt.

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So go ahead and type phunk upload receipt.

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OK.

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And we're going to need to use a completion handler here because we're going to need to basically escape

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a boolean value out that is either true or false if it's valid.

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So go ahead and type completion handler wups put a call in and then we're going to make it an escaping

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completion handler which basically means that we can send values out of the scope of the closure to

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wherever this function is actually called.

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So go ahead and type at escaping with a lowercase like so.

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And we're going to go ahead and basically use this little function here to call a boolean and that's

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where we're going to pass in our boolean value.

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And we're not going to return anything.

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So we're just going to say return void because we're not returning anything specifically.

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So very cool there's our completion handler.

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And now what we're going to do is we're going to access First of all the receipt you all from our phone.

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Believe it or not when you make a purchase on an app purchase a little you or L gets stored in the main

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bundle and then you can use that to pass up to the iTunes store and say Hey check this out is this good.

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So let's be let's be safe and use guard Latt because sometimes there might not be a receipt you are

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Al maybe you open the phone for the first time and you don't have a receipt or else you don't know whether

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or not you're good to go.

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So let's use guard let guard let And let's just say reseat you RL and to get that we're going to access

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the bundle we're going to go into the main bundle and check this out.

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There's something right there called app store receipt.

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You r l k the file u r l for the bundles AppStore receipt.

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Push enter and then type a comma.

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OK because we're going to create another property as well.

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Now we have the receipt you are Elb.

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Now we need to generate the receipt using data.

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So go ahead and type let receipt and that's going to be equal to data and we're going to use the data

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contents of function here.

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Contents of you l.

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Select the one that throws and if you know what that means that means we're going to have to use try

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at the beginning.

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We'll get to that in a second.

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So just choose data contents of the U R L is going to be receipt you r l it's not accessible to us yet.

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There we go receipt you r l k now what we need to do in order to actually use this is we need to encode

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it using base 64 encoding case to check it out type dot base 64 encoded string and it might not show

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up.

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But when an auto completes you'll see that it works.

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And basically what this is going to do is it's going to take our string value and it's going to encode

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it as a base 64 string and that's what we need to pass it up to iTunes.

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It needs to be base 64 encoded.

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Now of course if neither of these work we're going to call.

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Else.

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And inside this ELSE block is where we're going to basically send our completion handler a false return.

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Because obviously there was no receipt to return.

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So we're going to go ahead and call completion and then send it false like that.

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Then of course at the very end we need to return OK to get out of our guard let.

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But basically we're telling it hey there's no receipt you have not bought a subscription.

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So that's one thing we can do to safeguard ourselves against hackers and we can also just to you know

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for now de-bug print and just say no receipt.

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And that's just the way that we can print out to the console to show us what's going on.

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So very cool.

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It's going to yell at us because we have to call try because this can throw errors.

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So go ahead and just call it try and put a question mark.

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Meaning it's going to optionally try because we're in a guard lab.

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And if it does get that back we're going to have a variable of type data that we can do stuff with.

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OK.

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So next.

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Go ahead and return down a little ways.

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And what we need to do is we need to create a Jaison object that's going to be sent up to iTunes and

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then iTunes is going to verify that and send us down all the important Jason information all about our

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subscription.

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So let's create that Jason object by typing let it lapse let body like so and we're going to use an

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open bracket here and a close bracket there and then inside the body we're going to give a key of type

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string and a value using some of our values.

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So let's go ahead and just say in quotes receipt receipt dash data.

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Make sure you get this right because these are the parameters that iTunes once and the receipt data

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we already kind of used here with data and our receipt properties so go ahead and just pass in receipt.

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OK then we're going to go ahead and type password.

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This is another thing and you need a specific password in order to actually upload this type password.

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And this is where we need to create what is called an app secret.

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OK.

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That can be found on iTunes Connect So pull open your iTunes Connect.

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Go into my apps like so select the app that you're working on.

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Select features and it'll load in-app purchases.

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But check this out app specific shared secret.

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You can click on this and it will pop up a prompt and you click on generate.

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Then you can copy that and paste it into your project.

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But you'll see that I already have one saved here so I'm just going to copy it.

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But all you'll need to do is just click on the generate button and it'll make one for you.

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So this is my shared secret I'm going to go ahead and copy it.

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And at the time of this video this is my secret but I regenerated it right after this course so it's

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no longer the same.

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So you're gonna have to make your own.

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So go ahead and copy this and then go back to X code go into Constance and we're going to actually create

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a constant here for our app secret just so that we can use it throughout our app.

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So go ahead and type let app secret and set that there in quotes so it's a string.

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OK.

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Then go back to IAP service and we can pass it.

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Our app secret.

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OK.

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Now build it to make sure that that comes through.

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Very cool.

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And of course after this object we need a comma to separate the two.

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But this is an object that we can convert to Jaison and then pass up to iTunes.

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So to do that we're going to create another property called Body data.

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Go ahead and type let body data.

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And this is going to be equal to a Jaison object and we're going to use some of Apple's very cool Jason

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serialization classes to do that.

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So go ahead and type Jay sun serialization dot and you'll see there's a lot of different options.

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What we can say Dot data with Jaison object are based on object here is body and the options we can

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pass in are many but we're just going to go ahead and just pass in an empty array because it does ask

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for an array.

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The options will have a key and a value but you'll see we're getting an error here it says can call

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throe but it's not marked with try and the error is not handled.

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So to fix this we're just going to go ahead and call try and build it and make sure that that works.

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Oh whoops sorry.

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We're going to go head and called Try and then force tried because we already know this is valid Jaison

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and we already know that we can serialize it properly.

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OK so that's why we're force on wrapping it there if we build it you'll see we just get a warning saying

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that we haven't yet used the data.

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That's true.

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So let's use it.

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We're going to go ahead and basically create a U R L A U R L request and then we're going to pass it

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into u r l session.

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Upload this and then asked to see if we get a response from Apple.

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So go ahead and let's create a URL here type.

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Let u r l and that's going to be equal to u r l and we're going to create it with a string just like

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so.

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Push enter and the string you're going to have to copy this.

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Exactly K type H.

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Colon backslash backslash only two T's.

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Sorry and you're going to type sandbox.

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ITunes.

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Apple dot com slash verify receipt.

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OK.

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That is the string that we're going to use to instantiate a u r l to pass in our Jason object so force

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on raptus because it is a u r l.

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We know it's valid.

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Now we're going to create a request.

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OK.

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So create a Yoro request using a variable because we do need to set some properties for it.

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So go ahead n type var request equals you Arel request.

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And if you instantiate it you can pass in a u r l which we have one u r l k.

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Very cool.

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Now we need to set up the TTP method.

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And what the T P body is when we send it up.

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So go ahead and call request dot HTP method and it's going to be equal to post K because we are posting

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this up to the sandbox you r l and iTunes K the DP body the actual data we're sending up is our body

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data.

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So go ahead and type request.

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H TTP body and you'll you'll notice it's looking for an example of type data we can give it that by

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passing in body data.

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Very cool.

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So now that we have this all set up we are now ready to basically create a data task using you l session.

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We can take our request with our data pass it up to iTunes and then wait for a response.

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OK so let's go ahead and do that.

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Let's type let.

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Task equals your session dot shared session data task.

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And you'll notice there are a few options but we want the one with a u r l request and a completion

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handler because that's what we did.

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We created a u r l request and we want to know the response we get back.

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So select that pass in our request which is just called request request that we go and on the completion

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handler just press enter and give three names to these three properties.

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K this is our data that we get back our response data.

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This is our response and this is our error.

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OK in case we have one.

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Now here's what we're going to do.

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If we had an error we're going to go ahead and print that error then we're going to go ahead and just

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call complete on our completion handler.

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So we're going to go ahead and say if error is not equal to nil because if you notice it was optional

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we're passing in a parameter here but it was optional.

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If we had an error we're going to go ahead and call debug print and we're going to print out that error.

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And you know what.

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Before it why don't we put kind of a description here saying error space and then we can print out the

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error right beneath it or right behind it.

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I mean then if we have an error we're going to go ahead and call completion handler.

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OK remember to escape out and say hey not successful.

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So completion handler is going to be false.

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Ok just like above if we have no receipt false if it comes back with an error.

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False because that means that our receipt was not valid.

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OK very cool.

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So that is great.

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So our completion handler is false meaning we're saying hey not good.

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It was not a valid receipt didn't work.

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Someone tried to steal it and we're going to call our completion handler to be false.

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Ok but what if we didn't get an error what if it was good we'll call else.

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And now this is where we're going to use our response data.

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OK.

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So we're going to basically take the response data that was downloaded from the server which includes

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lots of vital information like the subscription type the product ID the expiration date et cetera et

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cetera.

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So go ahead and we're going to create a property for the Jason data that's coming back down like so

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by typing.

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Let Jaison equals Jaison serialization Jaison object and we actually are going to choose the one with

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data and options like so now the data we're going to get from response data just like so.

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And the options just like before we don't care about we're just going to go ahead and put some empty

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brackets there because it asks for an array.

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And that's great.

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So we're getting our response data here.

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This is awesome.

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But you know what.

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It's coming in as optional and I don't really want to force unwrap it.

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So let's go ahead and set up some constants here.

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How about if let error equals error.

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We'll just going to print the actual error so that it doesn't come in as optional.

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OK.

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Then whoops was build this I'm not sure why we're getting some trouble here.

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OK then we'll say.

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Else if.

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Let.

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Response.

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Data equals response data.

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Meaning if we do get a response it'll come in as this constant and we're setting the option of value

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to be this constant.

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Now I don't have to force on rapid anymore.

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OK.

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So it's saying that we can't call this because we are trying remember we had to force try up at the

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top here so we're going to do the same thing to turn this into adjacent object here.

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Just like so very cool.

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So now we do download a Jason object but we're not yet using it.

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OK.

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Now what we're going to need to do is basically to print the Jason and then take a look at it.

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We want to see what is actually in there so we know what to pull out.

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I'll give you a clue we want to pull out the expiration date because that's going to help us determine

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whether or not our subscription is still valid.

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But let's just for now go ahead and print the Jason and then basically if this worked if there was no

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error we can call completion handler.

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True.

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Right.

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Because we know that it work.

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There was no error.

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And we successfully printed Jaison.

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Now we're getting a warning here and it's saying that task was never used.

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This is a big issue.

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If we leave it as it is the task will never run because we need to call it Task datt resume.

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OK.

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That's basically going to start the task for us.

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And if it gets suspended it will resume it for us so I don't know about you but I really want to go

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try this.

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So let's think about where we want to call this we should call this when we make a subscription.

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Let's just put it there for now.

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Let's go ahead and just call upload receipt.

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That's our function we made push enter on our completion handler and just give a name for the boolean

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let's just say valid.

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If the receipt is valid if valid.

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Let's do de-bug print and we'll say what.

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What do we want to say.

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Subscription is totally valid man otherwise.

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Or else.

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Let's just say it doesn't look like you bought this.

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OK.

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So let's build and run.

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Let's go and make a transaction and let's just verify that our subscription is valid or we're just going

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to check our receipt.

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By the way our subscription should be expired because it's been longer than five minutes and here we

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go.

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So wow.

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It looks like it automatically purchased us that for us.

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That's not good.

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Let's scroll up to the top here.

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Yeah it's saying subscription valid purchase was successful.

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We did not purchase that.

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So it looks like calling this function from here is not a good choice we're not actually going to put

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it there.

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There's a really helpful delegate method for later but for now look at this we're getting all of our

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information there's all the Jaison data.

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Here's our expiration date and it looks like it expires in five minutes from when we ordered it right.

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1:41 1:44 And of course this hour is always wrong but the minutes are correct.

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So guys this is really cool we have a subscription and it's working this is amazing.

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So we're going to put it in the right place in a future video but for now we can tell our subscription

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is good to go.

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We've officially bought it and we can verify it with iTunes.

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This is going to prevent you from having people steal your in-app purchases.

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Very very cool.

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So for now I'm actually going to go ahead and delete this.

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And in the next video we're going to write another function that is basically going to extract the expiration

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date from this Jason data and we're going to set up that in user defaults so that we can lock down that

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expiration date so that we can access the expiration date whenever we need.

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And in the next video we're going to write a function that's basically going to extract the expiration

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date from the Jason data that we downloaded from Apple.

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Once we verified it and we're going to use that Jaison data to essentially save the expiration date

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into user defaults so that even if we open the app up we can verify that the current date is still behind

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the expiration date.

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And that will help us to manage whether or not the subscription is active or expired.

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Ok really cool.

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So let's go ahead and let's head over to the next video where we're going to write that function.

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We're going to write an extension of date and we're also going to write a function to determine whether

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or not our our subscription is still active.

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Very very cool stuff guys.

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Let's head over to the next video and let's do that now.