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Hey everybody what's going on this is Caleb with Deb's Lopes dot com.

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And if you remember in the last video we wrote a function that basically prevents are in at purchased

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subscriptions from ever being pirated.

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It basically uploads the data that saved to your phone compares it against iTunes servers.

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If it's good to go we get a response back.

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If not we get an error and our app basically returns false saying no.

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No that's not a real purchase.

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Very very cool stuff in this video we're going to write two functions one that's basically going to

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extract the expiration date from the sun data and return it back to us.

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We're also going to write a function that will be able to determine whether or not our subscription

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is still active or if it expired and to do that we're going to need to make an extension of date so

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that we can check to see hey is this less than a certain date.

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Is this more than a certain date so that we can basically see hey is our subscription still good to

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go.

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So pull open your project and let's begin actually by extracting the expiration date from the Jason

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data downloaded from our application.

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So let's go ahead and beneath our upload receipt function we're going to write a new function called

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expiration date from response.

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So go ahead and type that phunk expiration date from response.

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OK.

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Now this function is going to return a date and an optional date because there is a chance that it might

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not return anything.

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So go ahead and give it some curly brackets and we're going to pass in our Jason response.

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Now that should be a capital are a capital R and we need to think most of the time when we're dealing

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with Jaison it's cast as a dictionary of string and any.

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But we did not do that up here when we have our Jason downloaded.

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So we should actually do that first because we're going to pass that into our function.

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So let's cast that as a dictionary of string.

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And any.

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And of course we need to fix that so it says string and that's stirring because that's not a real type

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anyway.

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So now that this is a dictionary we can pass in this same type into our function so we can type.

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Dictionary of string and any escape.

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Really really cool.

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Now if you remember this is our dictionary that gets passed in k we have lots of information for all

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of these different purchases.

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And then we also have an expiration date.

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You see that right there it says expires date 2017 9 18 2044 20 GMT.

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So this is the subscription date when it expires which is pretty cool.

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And so we can use that key later to get this value as the date.

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So let's go ahead and let's write this function.

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Now we're basically going to create an array of receipt info.

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And that's going to come from an array within this called receipt info so check it out.

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If we look in here we got to look a little bit deeper you'll see that inside this there is an array

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called latest receipt info and it comes from the Jason response it's an array which we can tell here

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and it's actually an array of dictionaries.

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OK.

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So what we're going to do is we're going to go ahead and type if let receipt info of type MSRA like

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so it's going to be equal to the sun response and we're going to pull out the item that is called latest

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receipt info.

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Like so.

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All right.

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And in order to actually cast this as an array we're going to go ahead and cast that optionally as an

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NSA right like so.

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So assuming that we do get this receipt info re filled we can go ahead and pull out the last receipt

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information which if you look here is latest receipt info.

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Here's the opening brackets of the array.

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And here's the first dictionary second dictionary third fourth fifth sixth and check it out.

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OK this is the last dictionary before it goes into the next array pending renewal info.

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So we want the last item because that is the latest most up to date information.

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So we're going to go ahead and call Let last receipt equals receipt info remember.

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That's an X-ray and we can just get the last object by calling dot last object.

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OK and that's going to give us the very last object which we know is a dictionary of string and any

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object so we can go ahead and just cast that as a dictionary of string and any and I set any object.

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But I meant any.

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Now what we can do is we can basically pull out the date value here which actually is in the perfect

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format for the date type.

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But before we do that we're going to actually set up a date formatter so that we can tell it that we

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want the date to actually be this exact format with the year month date with the time the time zone

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everything.

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So let's set up the format first and then we'll set up the instance of date.

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So go ahead and type let formatter equals date formatter and instantiate it.

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Now we need to set up formatter date format.

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There's three tiers there huh.

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Formatter.

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Date format and you'll see it's of type string.

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So in order to set the proper format we need to type it like this.

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Why why why why for the years dash capital M M for month Didache lowercase d d for the day then ours

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is capitalized.

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Minutes is minimized and seconds is also small.

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And then at the end Vee-Vee indicates that we want the time zone K so there is our formatted date and

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now what we can do is we can create a constant called Let expiration date expiration date of type date

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of type date like so equals formatter and then we can call a function upon that.

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That's date from string k.

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Now we want this string value here which is our expiration date.

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Now how are we going to get that.

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We can take the last row seat array or the last recy dictionary.

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Like so last receipt and we can pull out the value for expires.

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Date.

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Check it out.

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I can type.

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Expires date and we can cast this as a string like so.

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Whoops.

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As String K so we're now creating a date from the expiration date which is conveniently in the same

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format.

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Thank you Apple and we can cast this as a date like so so that we can basically say hey this needs to

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be of type date.

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Now we're getting an error saying we're not using this or I guess a warning.

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So let's do that.

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If the receipt info is good to go we're going to go ahead and return the expiration date.

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K that we just generated.

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Otherwise we're going to just return nil because this is optional we might not get a return date back

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and that's fine.

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So if I go ahead and build this you'll notice it'll build it'll run and it will do exactly as we want

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it to.

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Which is beautiful but we are not yet finished so we're going to go ahead and head back into our upload

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receipt function and we're going to call this so that we can set our expiration date.

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OK now let's go ahead let's get rid of this print function here and let's just go ahead and say let

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new expiration date equals expiration date from response and let's pass in the Jason response Jason.

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So as as you might expect this will return a date to us and then we can do something with this expiration

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date property.

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So let's just print it for now using DEBUG print and we're going to print out new expiration date and

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you know what let's actually say new expiration date with space and a comma then we can print out both

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in the same debug print.

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OK.

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Super super cool.

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I think we should be good to go if we build this.

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Oh you know what.

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It's going to say that we need to call cell phone because we're in a closure.

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So call self-taught expiration date and let's go build and run this and subscribe and then let's see

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if we actually can print out our new expiration date.

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So build and run and we should be able to check this out.

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All right.

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Here we go.

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Beautiful.

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All right so we see IAP products loaded let's tap on our subscribe button enter our password one two

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three exclamation mark press enter.

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So remember what we're looking for here is it should print out our new subscription date when we push

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subscribe and confirm it.

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Let's see what happens UK it says subscription valid purchase was successful.

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Interesting so I wonder why we did not get an expiration date to print for us.

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Interesting.

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So we go through we call oh guys you know what.

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I just remembered we we were not calling upload receipt from anywhere.

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That is unfortunate.

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Let's let's go put it back.

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Really quick upload receipt valid.

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And you know what we don't actually need to do anything in there because we're just focusing on what's

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happening inside the upload receipt function.

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And when this loads we should see the expiration date printout which should be about five minutes after

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223.

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So let's go ahead and push the subscribe button.

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New expiration date optional to 2017.

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21:27 that's about five minutes after when I subscribe.

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So that's amazing.

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It's working.

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We're getting an expiration date back.

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That's five minutes in the future which in the real world would be a whole month.

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So that's cool.

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That works.

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Let's get rid of this.

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That's awesome.

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And now we can successfully extract our expiration date.

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But let's go ahead and let's actually force on rap that so it doesn't come in as optional.

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It also silences that warning for us.

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But now now that we can actually check to see if our receipt is valid and get our expiration date.

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Now is the time for us to basically say hey is is the current date before the expiration date or after.

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And that will help us to know hey is our purchase active or not.

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So let's go ahead and let's write that function let's stop this from running to free up some memory

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and up above upload receipt.

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We're going to write a new function.

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OK.

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So go ahead and type phunk is subscription active OK.

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And just like this function we're going to go ahead and basically pass in a boolean and that boolean

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is going to say yep it's active or no it's not.

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So I'm just going to copy the same completion handler here and paste it in.

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So what we're going to do is we are basically going to create a property that will hold the date for

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now and then we're going to compare it to the expiration date that gets returned to us from our Jason

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call.

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So let's go ahead and let's do that by typing.

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Let Now date equals date.

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And by simply instantiating that we get an instance of date for the exact second that it's instantiated

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which is perfect.

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So we have the date now but we need a way to basically access the expiration date.

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And when we call upload receipt that's great but we should be doing something to save this expiration

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date somewhere important like user defaults.

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It should be stored there.

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So to do that we're going to actually make a quick little function that is going to set the expiration

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date into a nice little user defaults Boullion.

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So go ahead and call this function phunk set expiration.

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OK.

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And we're going to set the expiration for a particular date OK with an internal parameter of date of

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type date.

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OK.

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And this function we're going to call user defaults dot standard dot set.

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OK.

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And we're going to set value of any K for a particular key of type string.

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Now the value is the date coming in right and we're setting it with the key expiration date with only

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one t.

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Now this key will help us to access this from user defaults later on.

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But for now this function will let us save it and keep it there.

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So instead of just printing the expiration date.

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Now let's go ahead and call self set expiration for date new expiration date.

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OK.

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Really cool.

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And you know what let's go ahead and force on wrap it there so that we save the value not the optional

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value.

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And now we will be able to actually save our date which is beautiful.

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Now that's great to save it in user defaults.

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But I wish we had a property in this in this Singleton that we can basically access at any time which

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we can do if we go ahead and go up to the top.

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We created 1 in the starter project for the Boullion non consumable purchase was made.

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So right above that we can type var expiration date expiration date equals user defaults dot standard

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dot value for key and the path or the key.

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I mean is expiration date.

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All right.

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And you know what.

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Since that's just a value I'm going to actually cast it.

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Let's forecast that as a date because we know it's going to come in as date if it'll let us forecast

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that.

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Okay perfect.

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That's really cool.

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That will work.

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And now what we can do is we can basically say you know if the now date is before or less than the expiration

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date we're good otherwise we're not okay that's how we're going to basically determine if our subscription

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is active or not.

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Now the problem with what we're doing here is that the date subclassed and all of the fancy date stuff

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does not really have a function that can that can compare dates in this way so easily.

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So what we're actually going to do is to create an extension of date write our own custom function and

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call it comparing the two dates.

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So go ahead and right click on food Zyla create a new group and call it extension's.

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Right click on the extensions folder and create a new file.

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OK click.

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Swift file.

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And then we're going to go ahead and just call this date XTi.

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OK so now we're going to do is we're going to go ahead and create an extension of date by typing extension

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date.

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And now any functions that we write in here it can be called upon any instance of date.

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And so let's do that by typing phunk is less than.

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And we're going to be able to pass in a date and then use that to compare against the current date.

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OK.

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Now go ahead and just create a property here let's just say past date of type date and we're going to

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basically say if self meaning whatever instance of date let's say that I made an instance of the date

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for today like you know the now date constantly created if self time interval since and look at what

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it does it returns the interval between the receiver and another given date.

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So now and then if we can get the difference we get the value of how long it will take basically to

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get to that point.

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So if the time interval since the past date well past date sounds like in the past let's just say date.

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How about that.

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That makes a little more sense.

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So if the of if the if the instance of date that this is called on we're going to say how far is it

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until the actual subscription expiration date.

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Ok if that is less than the date we pass in time interval since now meaning the difference between the

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date value and right now then what we're going to do is we're going to go ahead and return true.

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Okay.

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And you know what we need to actually return a boolean here if we're going to do that.

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Okay.

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Otherwise

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we're going to return false.

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Now what this function is basically going to do is it's going to let us say hey if the current date

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is less then the subscription date then it's valid.

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If it's not then it's going to return false.

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So let's go back into our IAP service and what we can do is we can take that property we just saved

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the expiration date.

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We're pulling it from user defaults.

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What we can do is we can basically say hey if there's an expiration date if if one is saved because

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the odds are one might not be saved.

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OK.

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You know a new subscriber if one is subscribed if a date is saved we can say hey if Now if the now date

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is less then the expiration date we can return true to our completion handler meaning subscription still

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active man.

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If not we can return false.

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So let's go ahead and let's use guard let so that we can safely create a constant for the expiration

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date in case there's not one.

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So go ahead and type guard.

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Let expiration date equals expiration date.

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The one we have saved up above and we can say else return cake because if we do not have one we'll just

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return.

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Get out of the function and save us from crashing.

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What we can do is we can say hey if the now date is less then remember that's our extension.

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If it's less then the expiration date.

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Check it out.

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We can go ahead and say hey completion is going to be true.

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Otherwise if it's not less then that means we've already gone past our expiration date else completion

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handler is false.

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OK.

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So that's pretty cool.

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Now we're getting an error here at saying needs to be optional cannot be of type date.

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But the reason for that is because we're force unwrapping it as date.

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Let's go ahead and optionally unwrap it there as a date and you'll see that air will go away.

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Our function will work.

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And this is super super cool guys.

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I think we should try this.

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I think that we should go ahead and see if this works to call our is subscription active function but

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we need to think of a way we can do it.

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And you know what let's actually figure that out in the next video.

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I have just the thing.

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So let's head over there and I'll see in the next video.