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IAPProduct.m
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IAPProduct.m
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#import "IAPProduct.h"
#import <StoreKit/StoreKit.h>
#import "FSMMachine.h"
#import "IAPCatalogue.h"
#import "SKProduct+PriceWithCurrency.h"
@interface IAPProduct()
@property (nonatomic, readwrite, strong) NSString* identifier;
@property (nonatomic, strong) IAPCatalogue* catalogue;
@property (nonatomic, readwrite, strong) NSString* price;
@property (nonatomic, strong) FSMMachine* stateMachine;
@property (nonatomic, readwrite, strong) const NSString* state;
@property (nonatomic, strong) NSMutableArray* observers;
@property (nonatomic, readwrite, strong) NSUserDefaults* settings;
@end
@implementation IAPProduct
@synthesize identifier = _identifier;
@synthesize catalogue = _catalogue;
@synthesize price = _price;
@synthesize stateMachine;
@synthesize state = _state;
@synthesize observers;
@synthesize settings = _settings;
// State machine states and events
const NSString* kStateLoading = @"Loading";
const NSString* kStateReadyForSale = @"ReadyForSale";
const NSString* kStatePurchased = @"Purchased";
const NSString* kStatePurchasing = @"Purchasing";
const NSString* kStateRestoring = @"Restoring";
const NSString* kStateRestored = @"Restored";
const NSString* kStateError = @"Error";
const NSString* kEventSetPrice = @"SetPrice";
const NSString* kEventSetPurchased = @"SetPurchased";
const NSString* kEventSetError = @"SetError";
const NSString* kEventSetRestored = @"SetRestored";
const NSString* kEventSetPurchasing = @"SetPurchasing";
const NSString* kEventRecoverToReadyForSale = @"RecoverToReadyForSale";
const NSString* kEventRecoverToLoading = @"RecoverToLoading";
const NSString* kEventRestoreStarted = @"RestoreStarted";
const NSString* kEventRestoreEnded = @"RestoreEnded";
- (id)initWithCatalogue:(IAPCatalogue*)catalogue identifier:(NSString*)identifier settings:(NSUserDefaults*)settings {
self = [super init];
if (self) {
self.identifier = identifier;
self.catalogue = catalogue;
[self loadStateMachine: kStateLoading];
self.observers = [NSMutableArray array];
self.settings = settings;
[self restore];
}
return self;
}
- (void)dealloc {
[self unloadStateMachine];
}
- (void)loadStateMachine:(const NSString*)initialState {
[self unloadStateMachine];
self.stateMachine = [[FSMMachine alloc] initWithState:initialState];
[self.stateMachine addTransition:kEventSetPrice startState:kStateLoading endState:kStateReadyForSale];
[self.stateMachine addTransition:kEventSetPrice startState:kStateReadyForSale endState:kStateReadyForSale];
[self.stateMachine addTransition:kEventSetPrice startState:kStatePurchased endState:kStatePurchased];
[self.stateMachine addTransition:kEventSetPrice startState:kStateRestored endState:kStateRestored];
[self.stateMachine addTransition:kEventRecoverToReadyForSale startState:kStateError endState:kStateReadyForSale];
[self.stateMachine addTransition:kEventRecoverToLoading startState:kStateError endState:kStateLoading];
[self.stateMachine addTransition:kEventSetPurchasing startState:kStateReadyForSale endState:kStatePurchasing];
[self.stateMachine addTransition:kEventSetError startState:kStateLoading endState:kStateError];
[self.stateMachine addTransition:kEventSetError startState:kStatePurchasing endState:kStateError];
[self.stateMachine addTransition:kEventSetError startState:kStateRestoring endState:kStateError];
[self.stateMachine addTransition:kEventSetPurchased startState:kStatePurchasing endState:kStatePurchased];
[self.stateMachine addTransition:kEventSetRestored startState:kStateLoading endState:kStateRestored];
[self.stateMachine addTransition:kEventSetRestored startState:kStateReadyForSale endState:kStateRestored];
[self.stateMachine addTransition:kEventSetRestored startState:kStatePurchasing endState:kStateRestored];
[self.stateMachine addTransition:kEventSetRestored startState:kStateRestoring endState:kStateRestored];
[self.stateMachine addTransition:kEventRestoreStarted startState:kStateReadyForSale endState:kStateRestoring];
[self.stateMachine addTransition:kEventRestoreEnded startState:kStateRestoring endState:kStateReadyForSale];
[self.stateMachine addObserver:self forKeyPath:@"state" options:NSKeyValueObservingOptionNew context:nil];
self.state = self.stateMachine.state;
}
- (void)unloadStateMachine {
if (self.stateMachine)
[self.stateMachine removeObserver:self forKeyPath:@"state"];
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if (object == self.stateMachine) {
if ([@"state" isEqualToString:keyPath]) {
bool stateChanged = self.state != self.stateMachine.state;
self.state = self.stateMachine.state;
if (stateChanged) {
[self notifyObserversOfStateChange];
}
}
}
}
- (void)updateWithSKProduct:(SKProduct*)skProduct {
self.price = skProduct.priceWithCurrency;
[self.stateMachine applyEvent:kEventSetPrice];
[self save];
}
- (void)updateWithSKPaymentTransaction:(SKPaymentTransaction*)skTransaction {
switch (skTransaction.transactionState) {
case SKPaymentTransactionStatePurchased: {
if (self.state == kStatePurchasing)
[self.stateMachine applyEvent:kEventSetPurchased];
break;
}
case SKPaymentTransactionStateFailed: {
if (self.state == kStatePurchasing) {
[self.stateMachine applyEvent:kEventSetError];
[self.stateMachine applyEvent:kEventRecoverToReadyForSale];
}
break;
}
case SKPaymentTransactionStateRestored: {
if (self.state == kStateRestoring)
[self.stateMachine applyEvent:kEventSetRestored];
break;
}
}
[self save];
}
- (void)updateWithSKPayment:(SKPayment*)skPayment {
[self.stateMachine applyEvent:kEventSetPurchasing];
[self save];
}
- (void)restoreStarted {
[self.stateMachine applyEvent:kEventRestoreStarted];
}
- (void)restoreFailedWithError:(NSError*)error {
if (self.state == kStateRestoring) {
[self.stateMachine applyEvent:kEventSetError];
[self.stateMachine applyEvent:kEventRecoverToReadyForSale];
}
}
- (void)restoreEnded {
if (self.state == kStateRestoring) {
[self.stateMachine applyEvent:kEventRestoreEnded];
}
}
- (NSString*)settingsKey:(NSString*)setting {
return [NSString stringWithFormat:@"IAP%@%@", self.identifier, setting];
}
- (NSString*)priceKey {
return [self settingsKey:@"price"];
}
- (NSString*)stateKey {
return [self settingsKey:@"state"];
}
- (void)save {
[self.settings setValue:self.price forKey:[self priceKey]];
[self.settings setValue:self.state forKey:[self stateKey]];
}
- (void)restore {
self.price = [self.settings valueForKey:[self priceKey]];
NSString* stateSetting = [self.settings valueForKey:[self stateKey]];
const NSString* state = kStateLoading;
if ([kStatePurchased isEqualToString:stateSetting]) {
state = kStatePurchased;
}
else if ([kStateRestored isEqualToString:stateSetting]) {
state = kStateRestored;
}
[self loadStateMachine:state];
}
- (BOOL)identifierEquals:(NSString*)identifier {
return identifier && [identifier isEqualToString:self.identifier];
}
- (BOOL)isLoading {
return [self.stateMachine isInState:kStateLoading];
}
- (BOOL)isReadyForSale {
return [self.stateMachine isInState:kStateReadyForSale];
}
- (BOOL)isError {
return [self.stateMachine isInState:kStateError];
}
- (BOOL)isPurchasing {
return [self.stateMachine isInState:kStatePurchasing];
}
- (BOOL)isPurchased {
return [self.stateMachine isInState:kStatePurchased] || [self.stateMachine isInState:kStateRestored];
}
- (BOOL)isRestored {
return [self.stateMachine isInState:kStateRestored];
}
- (BOOL)isRestoring {
return [self.stateMachine isInState:kStateRestoring];
}
- (void)purchase {
[self.catalogue purchaseProduct:self];
}
- (void)restorePurchase {
[self.catalogue restoreProduct:self];
}
- (void)addObserver:(id<IAPProductObserver>)iapProductObserver {
[self.observers addObject:[NSValue valueWithNonretainedObject:iapProductObserver]];
[self cleanEmptyObservers];
}
- (void)removeObserver:(id<IAPProductObserver>)iapProductObserver {
[self.observers removeObject:[NSValue valueWithNonretainedObject:iapProductObserver]];
[self cleanEmptyObservers];
}
- (void)notifyObserversOfStateChange {
for (NSValue* observer in self.observers) {
id<IAPProductObserver> iapProductObserver = [observer nonretainedObjectValue];
if (iapProductObserver && [iapProductObserver respondsToSelector:@selector(iapProductWasUpdated:)]) {
[iapProductObserver iapProductWasUpdated:self];
}
}
[self cleanEmptyObservers];
}
- (void)cleanEmptyObservers {
NSMutableArray* toDelete = [NSMutableArray array];
for (NSValue* observer in self.observers) {
if (![observer nonretainedObjectValue]) {
[toDelete addObject:observer];
}
}
[self.observers removeObjectsInArray:toDelete];
}
@end