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ReviewDownloadManager.m
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ReviewDownloadManager.m
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//
// ReviewDownloadManager.m
// AppSales
//
// Created by Ole Zorn on 27.07.11.
// Copyright 2011 omz:software. All rights reserved.
//
#import "ReviewDownloadManager.h"
#import "Product.h"
#import "Review.h"
#define kReviewInfoTitle @"title"
#define kReviewInfoUser @"user"
#define kReviewInfoDateString @"dateString"
#define kReviewInfoRating @"rating"
#define kReviewInfoVersion @"version"
#define kReviewInfoText @"text"
#define MAX_CONCURRENT_REVIEW_DOWNLOADS 5
@interface ReviewDownloadManager ()
- (void)dequeueDownload;
@end
@implementation ReviewDownloadManager
- (id)init
{
self = [super init];
if (self) {
activeDownloads = [NSMutableSet new];
downloadQueue = [NSMutableArray new];
}
return self;
}
+ (id)sharedManager
{
static id sharedManager = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedManager = [[self alloc] init];
});
return sharedManager;
}
- (void)downloadReviewsForProducts:(NSArray *)products
{
if ([activeDownloads count] > 0 || [downloadQueue count] > 0) return;
NSDictionary *storeInfos = [[NSDictionary dictionaryWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"stores" ofType:@"plist"]] objectForKey:@"StoreInfos"];
for (NSString *country in storeInfos) {
NSDictionary *storeInfo = [storeInfos objectForKey:country];
NSString *storeID = [storeInfo objectForKey:@"storeID"];
for (Product *product in products) {
if (product.parentSKU) continue; //don't download reviews for in-app-purchases
ReviewDownload *download = [[[ReviewDownload alloc] initWithProduct:product storeFront:storeID countryCode:country] autorelease];
download.delegate = self;
[downloadQueue addObject:download];
}
}
totalDownloadsCount = [downloadQueue count];
completedDownloadsCount = 0;
[[NSNotificationCenter defaultCenter] postNotificationName:ReviewDownloadManagerDidUpdateProgressNotification object:self];
[self dequeueDownload];
}
- (void)cancelAllDownloads
{
[downloadQueue removeAllObjects];
for (ReviewDownload *download in activeDownloads) {
[download cancel];
}
[activeDownloads removeAllObjects];
completedDownloadsCount = 0;
totalDownloadsCount = 0;
[[NSNotificationCenter defaultCenter] postNotificationName:ReviewDownloadManagerDidUpdateProgressNotification object:self];
}
- (void)dequeueDownload
{
if ([downloadQueue count] == 0) return;
if ([activeDownloads count] >= MAX_CONCURRENT_REVIEW_DOWNLOADS) return;
ReviewDownload *nextDownload = [[[downloadQueue objectAtIndex:0] retain] autorelease];
[downloadQueue removeObjectAtIndex:0];
[activeDownloads addObject:nextDownload];
[nextDownload start];
[self dequeueDownload];
}
- (void)reviewDownloadDidFinish:(ReviewDownload *)download
{
[activeDownloads removeObject:download];
completedDownloadsCount++;
[[NSNotificationCenter defaultCenter] postNotificationName:ReviewDownloadManagerDidUpdateProgressNotification object:self];
[self dequeueDownload];
}
- (BOOL)isDownloading
{
return [downloadQueue count] != 0 || [activeDownloads count] != 0;
}
- (float)downloadProgress
{
float progress = (totalDownloadsCount == 0) ? 1.0 : (float)completedDownloadsCount / (float)totalDownloadsCount;
return progress;
}
- (void)dealloc
{
[activeDownloads release];
[downloadQueue release];
[super dealloc];
}
@end
@implementation ReviewDownload
@synthesize delegate, downloadConnection;
- (id)initWithProduct:(Product *)app storeFront:(NSString *)storeFrontID countryCode:(NSString *)countryCode
{
self = [super init];
if (self) {
_product = [app retain];
country = [countryCode retain];
productObjectID = [[app objectID] copy];
psc = [[[app managedObjectContext] persistentStoreCoordinator] retain];
storeFront = [storeFrontID retain];
data = [NSMutableData new];
page = 1;
}
return self;
}
- (void)start
{
backgroundTaskID = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil];
NSString *productID = _product.productID;
NSString *URLString = [NSString stringWithFormat:@"http://itunes.apple.com/WebObjects/MZStore.woa/wa/customerReviews?s=%@&id=%@&displayable-kind=11&page=%i&sort=4", storeFront, productID, page];
NSURL *URL = [NSURL URLWithString:URLString];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
[request setValue:@"iTunes/10.1.1 (Macintosh; Intel Mac OS X 10.6.5) AppleWebKit/533.19.4" forHTTPHeaderField:@"User-Agent"];
[request setValue:[NSString stringWithFormat:@"%@-1,12", storeFront] forHTTPHeaderField:@"X-Apple-Store-Front"];
self.downloadConnection = [NSURLConnection connectionWithRequest:request delegate:self];
}
- (void)cancel
{
if (backgroundTaskID != UIBackgroundTaskInvalid) {
[[UIApplication sharedApplication] endBackgroundTask:backgroundTaskID];
}
canceled = YES;
[self.downloadConnection cancel];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)dataChunk
{
[data appendData:dataChunk];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString *html = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
if (html) {
dispatch_async(dispatch_get_global_queue(0, 0), ^ {
NSArray *reviewInfos = [self reviewInfosFromHTML:html];
NSManagedObjectContext *moc = [[[NSManagedObjectContext alloc] init] autorelease];
[moc setPersistentStoreCoordinator:psc];
[moc setMergePolicy:NSMergeByPropertyObjectTrumpMergePolicy];
Product *product = (Product *)[moc objectWithID:productObjectID];
NSDateFormatter *reviewDateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[reviewDateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
if ([country isEqualToString:@"fr"]) {
NSLocale *frLocale = [[[NSLocale alloc] initWithLocaleIdentifier:@"fr"] autorelease];
[reviewDateFormatter setLocale:frLocale];
[reviewDateFormatter setDateFormat:@"dd MMM yyyy"];
} else if ([country isEqualToString:@"de"]) {
NSLocale *deLocale = [[[NSLocale alloc] initWithLocaleIdentifier:@"de"] autorelease];
[reviewDateFormatter setLocale:deLocale];
[reviewDateFormatter setDateFormat:@"dd.MM.yyyy"];
} else if ([country isEqualToString:@"it"]) {
NSLocale *itLocale = [[[NSLocale alloc] initWithLocaleIdentifier:@"it"] autorelease];
[reviewDateFormatter setLocale:itLocale];
[reviewDateFormatter setDateFormat:@"dd-MMM-yyyy"];
} else if ([country isEqualToString:@"us"]) {
NSLocale *usLocale = [[[NSLocale alloc] initWithLocaleIdentifier:@"en-us"] autorelease];
[reviewDateFormatter setLocale:usLocale];
[reviewDateFormatter setDateFormat:@"MMM dd, yyyy"];
} else {
NSLocale *usLocale = [[[NSLocale alloc] initWithLocaleIdentifier:@"en-us"] autorelease];
[reviewDateFormatter setDateFormat:@"dd-MMM-yyyy"];
[reviewDateFormatter setLocale:usLocale];
}
NSSet *downloadedUsers = [NSSet setWithArray:[reviewInfos valueForKey:kReviewInfoUser]];
//Fetch existing reviews, based on username and country:
NSFetchRequest *existingReviewsFetchRequest = [[[NSFetchRequest alloc] init] autorelease];
[existingReviewsFetchRequest setEntity:[NSEntityDescription entityForName:@"Review" inManagedObjectContext:moc]];
[existingReviewsFetchRequest setPredicate:[NSPredicate predicateWithFormat:@"product == %@ AND countryCode == %@ AND user IN %@", product, country, downloadedUsers]];
NSArray *existingReviews = [moc executeFetchRequest:existingReviewsFetchRequest error:NULL];
NSMutableDictionary *existingReviewsByUser = [NSMutableDictionary dictionary];
for (Review *existingReview in existingReviews) {
[existingReviewsByUser setObject:existingReview forKey:existingReview.user];
}
BOOL changesMade = NO;
for (NSDictionary *reviewInfo in [reviewInfos reverseObjectEnumerator]) {
Review *existingReview = [existingReviewsByUser objectForKey:[reviewInfo objectForKey:kReviewInfoUser]];
if (!existingReview) {
Review *newReview = [NSEntityDescription insertNewObjectForEntityForName:@"Review" inManagedObjectContext:moc];
newReview.user = [reviewInfo objectForKey:kReviewInfoUser];
newReview.title = [reviewInfo objectForKey:kReviewInfoTitle];
newReview.text = [reviewInfo objectForKey:kReviewInfoText];
newReview.rating = [reviewInfo objectForKey:kReviewInfoRating];
newReview.downloadDate = [NSDate date];
newReview.productVersion = [reviewInfo objectForKey:kReviewInfoVersion];
newReview.product = product;
newReview.countryCode = country;
newReview.unread = [NSNumber numberWithBool:YES];
newReview.reviewDate = [reviewDateFormatter dateFromString:[reviewInfo objectForKey:kReviewInfoDateString]];
[existingReviewsByUser setObject:newReview forKey:newReview.user];
changesMade = YES;
} else {
NSString *existingText = existingReview.text;
NSString *existingTitle = existingReview.title;
NSNumber *existingRating = existingReview.rating;
NSString *newText = [reviewInfo objectForKey:kReviewInfoText];
NSString *newTitle = [reviewInfo objectForKey:kReviewInfoTitle];
NSNumber *newRating = [reviewInfo objectForKey:kReviewInfoRating];
if (![existingText isEqualToString:newText] || ![existingTitle isEqualToString:newTitle] || ![existingRating isEqualToNumber:newRating]) {
existingReview.text = newText;
existingReview.title = newTitle;
existingReview.rating = newRating;
changesMade = YES;
}
}
}
[psc lock];
NSError *saveError = nil;
[moc save:&saveError];
if (saveError) {
NSLog(@"Could not save context: %@", saveError);
}
[psc unlock];
if (changesMade && [reviewInfos count] >= 20) {
dispatch_async(dispatch_get_main_queue(), ^ {
page = page + 1;
[self start];
});
} else {
dispatch_async(dispatch_get_main_queue(), ^ {
if (!canceled) {
[self.delegate reviewDownloadDidFinish:self];
}
});
}
});
} else {
if (!canceled) {
[self.delegate reviewDownloadDidFinish:self];
}
if (backgroundTaskID != UIBackgroundTaskInvalid) {
[[UIApplication sharedApplication] endBackgroundTask:backgroundTaskID];
}
}
}
- (NSArray *)reviewInfosFromHTML:(NSString *)html
{
NSMutableArray *reviews = [NSMutableArray array];
NSScanner *scanner = [NSScanner scannerWithString:html];
while (![scanner isAtEnd]) {
NSString *reviewTitle = nil;
[scanner scanUpToString:@"<span class=\"customerReviewTitle\">" intoString:NULL];
[scanner scanString:@"<span class=\"customerReviewTitle\">" intoString:NULL];
[scanner scanUpToString:@"</span>" intoString:&reviewTitle];
NSString *reviewRatingString = nil;
NSInteger rating = 0;
[scanner scanUpToString:@"<div class='rating'" intoString:NULL];
[scanner scanUpToString:@"aria-label='" intoString:NULL];
[scanner scanString:@"aria-label='" intoString:NULL];
[scanner scanUpToString:@"'>" intoString:&reviewRatingString];
if (reviewRatingString && reviewRatingString.length > 1) {
rating = [[reviewRatingString substringToIndex:1] integerValue];
}
NSString *reviewUser = nil;
[scanner scanUpToString:@"class=\"reviewer\">" intoString:NULL];
[scanner scanString:@"class=\"reviewer\">" intoString:NULL];
[scanner scanUpToString:@"</a>" intoString:&reviewUser];
[scanner scanString:@"</a>" intoString:NULL];
reviewUser = [reviewUser stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSString *reviewVersion = nil;
NSString *reviewDateString = nil;
NSString *reviewVersionAndDate = nil;
[scanner scanUpToString:@"</span>" intoString:&reviewVersionAndDate];
reviewVersionAndDate = [reviewVersionAndDate stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
if (reviewVersionAndDate) {
NSArray *versionAndDateLines = [reviewVersionAndDate componentsSeparatedByString:@"\n"];
if ([versionAndDateLines count] == 6) {
reviewVersion = [[versionAndDateLines objectAtIndex:2] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
reviewDateString = [[versionAndDateLines objectAtIndex:5] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}
}
NSString *reviewText = nil;
[scanner scanUpToString:@"<p class=\"content\" will-truncate-max-height=\"0\" data-text-truncate-lines=\"5\">" intoString:NULL];
[scanner scanString:@"<p class=\"content\" will-truncate-max-height=\"0\" data-text-truncate-lines=\"5\">" intoString:NULL];
[scanner scanUpToString:@"</p>" intoString:&reviewText];
reviewText = [reviewText stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
if (rating > 0 && reviewTitle && reviewUser && reviewVersion && reviewDateString && reviewText) {
NSDictionary *reviewInfo = [NSDictionary dictionaryWithObjectsAndKeys:
reviewTitle, kReviewInfoTitle,
reviewUser, kReviewInfoUser,
reviewVersion, kReviewInfoVersion,
reviewDateString, kReviewInfoDateString,
reviewText, kReviewInfoText,
[NSNumber numberWithInt:rating], kReviewInfoRating,
nil];
[reviews addObject:reviewInfo];
}
}
return reviews;
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
if (backgroundTaskID != UIBackgroundTaskInvalid) {
[[UIApplication sharedApplication] endBackgroundTask:backgroundTaskID];
}
[self.delegate reviewDownloadDidFinish:self];
}
- (void)dealloc
{
[country release];
[_product release];
[productObjectID release];
[psc release];
[downloadConnection release];
[data release];
[storeFront release];
[super dealloc];
}
@end