AudioscrobblerController.m

   1 /*
   2  *      MenuTunes
   3  *  AudioscrobblerController
   4  *    Audioscrobbler Support Class
   5  *
   6  *  Original Author : Kent Sutherland <kent.sutherland@ithinksw.com>
   7  *   Responsibility : Kent Sutherland <kent.sutherland@ithinksw.com>
   8  *
   9  *  Copyright (c) 2005 iThink Software.
  10  *  All Rights Reserved
  11  *
  12  */
  13
  14 #import "AudioscrobblerController.h"
  15 #import "PreferencesController.h"
  16 #import <openssl/evp.h>
  17 #import <ITFoundation/ITDebug.h>
  18
  19 #define AUDIOSCROBBLER_ID @"tst"
  20 #define AUDIOSCROBBLER_VERSION [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"]
  21
  22 static AudioscrobblerController *_sharedController = nil;
  23
  24 @implementation AudioscrobblerController
  25
  26 /*+ (void)load
  27 {
  28         NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  29         [[AudioscrobblerController sharedController] submitTrack:@"Immigrant Song" artist:@"Led Zeppelin" album:@"How The West Was Won" length:221];
  30         [[AudioscrobblerController sharedController] submitTrack:@"Comfortably Numb" artist:@"Pink Floyd" album:@"The Wall" length:384];
  31         [[AudioscrobblerController sharedController] submitTracks];
  32         [pool release];
  33 }*/
  34
  35 + (AudioscrobblerController *)sharedController
  36 {
  37         if (!_sharedController) {
  38                 _sharedController = [[AudioscrobblerController alloc] init];
  39         }
  40         return _sharedController;
  41 }
  42
  43 - (id)init
  44 {
  45         if ( (self = [super init]) ) {
  46                 _handshakeCompleted = NO;
  47                 _md5Challenge = nil;
  48                 _postURL = nil;
  49
  50                 /*_handshakeCompleted = YES;
  51                 _md5Challenge = @"rawr";
  52                 _postURL = [NSURL URLWithString:@"http://audioscrobbler.com/"];*/
  53
  54                 _delayDate = nil;
  55                 _responseData = nil;
  56                 _tracks = [[NSMutableArray alloc] init];
  57                 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleAudioscrobblerNotification:) name:nil object:self];
  58         }
  59         return self;
  60 }
  61
  62 - (void)dealloc
  63 {
  64         [_md5Challenge release];
  65         [_postURL release];
  66         [_responseData release];
  67         [_tracks release];
  68         [super dealloc];
  69 }
  70
  71 - (void)attemptHandshake
  72 {
  73         //Delay if we haven't met the interval time limit
  74         NSTimeInterval interval = [_delayDate timeIntervalSinceNow];
  75         if (interval > 0) {
  76                 ITDebugLog(@"Audioscrobbler: Delaying handshake attempt for %i seconds", interval);
  77                 [self performSelector:@selector(attemptHandshake) withObject:nil afterDelay:interval + 1];
  78                 return;
  79         }
  80
  81         NSString *user = [[NSUserDefaults standardUserDefaults] stringForKey:@"audioscrobblerUser"];
  82         if (!_handshakeCompleted && user) {
  83                 NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://post.audioscrobbler.com/?hs=true&p=1.1&c=%@&v=%@&u=%@", AUDIOSCROBBLER_ID, AUDIOSCROBBLER_VERSION, user]];
  84
  85                 _currentStatus = AudioscrobblerRequestingHandshakeStatus;
  86                 _responseData = [[NSMutableData alloc] init];
  87                 [NSURLConnection connectionWithRequest:[NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:30] delegate:self];
  88         }
  89 }
  90
  91 - (BOOL)handshakeCompleted
  92 {
  93         return _handshakeCompleted;
  94 }
  95
  96 - (void)submitTrack:(NSString *)title artist:(NSString *)artist album:(NSString *)album length:(int)length
  97 {
  98         ITDebugLog(@"Audioscrobbler: Adding a new track to the submission queue.");
  99         NSDictionary *newTrack = [NSDictionary dictionaryWithObjectsAndKeys:title,
 100                                                                                                                                                 @"title",
 101                                                                                                                                                 artist,
 102                                                                                                                                                 @"artist",
 103                                                                                                                                                 (album == nil) ? @"" : album,
 104                                                                                                                                                 @"album",
 105                                                                                                                                                 [NSString stringWithFormat:@"%i", length],
 106                                                                                                                                                 @"length",
 107                                                                                                                                                 [[NSDate date] descriptionWithCalendarFormat:@"%Y-%m-%d %H:%M:%S" timeZone:nil locale:nil],
 108                                                                                                                                                 @"time",
 109                                                                                                                                                 nil, nil];
 110         [_tracks addObject:newTrack];
 111         [self submitTracks];
 112 }
 113
 114 - (void)submitTracks
 115 {
 116         if (!_handshakeCompleted) {
 117                 [self attemptHandshake];
 118                 return;
 119         }
 120
 121         NSTimeInterval interval = [_delayDate timeIntervalSinceNow];
 122         if (interval > 0) {
 123                 ITDebugLog(@"Audioscrobbler: Delaying track submission for %f seconds", interval);
 124                 [self performSelector:@selector(submitTracks) withObject:nil afterDelay:interval + 1];
 125                 return;
 126         }
 127
 128         int i;
 129         NSMutableString *requestString;
 130         NSString *authString, *responseHash = @"";
 131         NSString *user = [[NSUserDefaults standardUserDefaults] stringForKey:@"audioscrobblerUser"];
 132         char *pass = (char *)[[PreferencesController getKeychainItemPasswordForUser:user] UTF8String];
 133         unsigned char *buffer;
 134         EVP_MD_CTX ctx;
 135
 136         ITDebugLog(@"Audioscrobbler: Submitting queued tracks");
 137
 138         if ([_tracks count] == 0) {
 139                 ITDebugLog(@"Audioscrobbler: No queued tracks to submit.");
 140                 return;
 141         }
 142
 143         //Build the MD5 response string we send along with the request
 144         buffer = malloc(EVP_MD_size(EVP_md5()));
 145         EVP_DigestInit(&ctx, EVP_md5());
 146         EVP_DigestUpdate(&ctx, pass, strlen(pass));
 147         EVP_DigestFinal(&ctx, buffer, NULL);
 148
 149         for (i = 0; i < 16; i++) {
 150                 responseHash = [responseHash stringByAppendingFormat:@"%0.2x", buffer[i]];
 151         }
 152
 153         free(buffer);
 154         buffer = malloc(EVP_MD_size(EVP_md5()));
 155         char *cat = (char *)[[responseHash stringByAppendingString:_md5Challenge] UTF8String];
 156         EVP_DigestInit(&ctx, EVP_md5());
 157         EVP_DigestUpdate(&ctx, cat, strlen(cat));
 158         EVP_DigestFinal(&ctx, buffer, NULL);
 159
 160         responseHash = @"";
 161         for (i = 0; i < 16; i++) {
 162                 responseHash = [responseHash stringByAppendingFormat:@"%0.2x", buffer[i]];
 163         }
 164         free(buffer);
 165
 166         authString = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL, (CFStringRef)[NSString stringWithFormat:@"u=%@&s=%@", user, responseHash], NULL, NULL, kCFStringEncodingUTF8);
 167         requestString = [[NSMutableString alloc] initWithString:authString];
 168         [authString release];
 169
 170         //We can only submit ten tracks at a time
 171         for (i = 0; (i < [_tracks count]) && (i < 10); i++) {
 172                 NSDictionary *nextTrack = [_tracks objectAtIndex:i];
 173                 NSString *trackString;
 174
 175                 trackString = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL, (CFStringRef)[NSString stringWithFormat:@"&a[%i]=%@&t[%i]=%@&b[%i]=%@&m[%i]=&l[%i]=%@&i[%i]=%@", i, [nextTrack objectForKey:@"artist"], i, [nextTrack objectForKey:@"title"], i, [nextTrack objectForKey:@"album"], i, i, [nextTrack objectForKey:@"length"], i, [nextTrack objectForKey:@"time"]], NULL, NULL, kCFStringEncodingUTF8);
 176                 [requestString appendString:trackString];
 177                 [trackString release];
 178         }
 179
 180         //Create and send the request
 181         NSMutableURLRequest *request = [[NSURLRequest requestWithURL:_postURL cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:30] mutableCopy];
 182         [request setHTTPMethod:@"POST"];
 183         [request setHTTPBody:[requestString dataUsingEncoding:NSUTF8StringEncoding]];
 184         _currentStatus = AudioscrobblerSubmittingTracksStatus;
 185         _responseData = [[NSMutableData alloc] init];
 186         [NSURLConnection connectionWithRequest:request delegate:self];
 187         [requestString release];
 188         [request release];
 189
 190         //If we have tracks left, submit again after the interval seconds
 191 }
 192
 193 - (void)handleAudioscrobblerNotification:(NSNotification *)note
 194 {
 195         if ([[note name] isEqualToString:@"AudioscrobblerHandshakeComplete"]) {
 196                 if ([_tracks count] > 0) {
 197                         [self performSelector:@selector(submitTracks) withObject:nil afterDelay:2];
 198                 }
 199         }
 200 }
 201
 202 #pragma mark -
 203
 204 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
 205 {
 206         ITDebugLog(@"Audioscrobbler: Connection error \"%@\"", error);
 207 }
 208
 209 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
 210 {
 211         [_responseData appendData:data];
 212 }
 213
 214 - (void)connectionDidFinishLoading:(NSURLConnection *)connection
 215 {
 216         NSString *string = [[NSString alloc] initWithData:_responseData encoding:NSASCIIStringEncoding];
 217         NSArray *lines = [string componentsSeparatedByString:@"\n"];
 218         NSString *responseAction = nil;
 219
 220         if ([lines count] > 0) {
 221                 responseAction = [lines objectAtIndex:0];
 222         }
 223
 224         if (_currentStatus == AudioscrobblerRequestingHandshakeStatus) {
 225                 if ([lines count] < 2) {
 226                         //We have a protocol error
 227                 }
 228                 if ([responseAction isEqualToString:@"UPTODATE"]) {
 229                         if ([lines count] >= 4) {
 230                                 _md5Challenge = [[lines objectAtIndex:1] retain];
 231                                 _postURL = [[NSURL alloc] initWithString:[lines objectAtIndex:2]];
 232                                 _handshakeCompleted = YES;
 233                                 [[NSNotificationCenter defaultCenter] postNotificationName:@"AudioscrobblerHandshakeComplete" object:self];
 234                         } else {
 235                                 //We have a protocol error
 236                         }
 237                         //Something
 238                 } else if (([responseAction length] > 5) && [[responseAction substringToIndex:5] isEqualToString:@"UPDATE"]) {
 239                         //Something plus update action
 240                 } else if (([responseAction length] > 5) && [[responseAction substringToIndex:5] isEqualToString:@"FAILED"]) {
 241                         //We have a error
 242                 } else if ([responseAction isEqualToString:@"BADUSER"]) {
 243                         //We have a bad user
 244                 } else {
 245                         //We have a protocol
 246                 }
 247         } else if (_currentStatus == AudioscrobblerSubmittingTracksStatus) {
 248                 if ([responseAction isEqualToString:@"OK"]) {
 249                 } else if ([responseAction isEqualToString:@"BADAUTH"]) {
 250                         //Bad auth
 251                 } else if (([responseAction length] > 5) && [[responseAction substringToIndex:5] isEqualToString:@"FAILED"]) {
 252                         //Failed
 253                 }
 254         }
 255
 256         //Handle the final INTERVAL response
 257         if (([[lines objectAtIndex:[lines count] - 2] length] > 9) && [[[lines objectAtIndex:[lines count] - 2] substringToIndex:8] isEqualToString:@"INTERVAL"]) {
 258                 int seconds = [[[lines objectAtIndex:[lines count] - 2] substringFromIndex:9] intValue];
 259                 ITDebugLog(@"Audioscrobbler: INTERVAL %i", seconds);
 260                 [_delayDate release];
 261                 _delayDate = [[NSDate dateWithTimeIntervalSinceNow:seconds] retain];
 262         } else {
 263                 ITDebugLog(@"No interval response.");
 264                 //We have a protocol error
 265         }
 266
 267         [string release];
 268         [_responseData release];
 269 }
 270
 271 @end