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:(BOOL)force
  72 {
  73         if (_handshakeCompleted && !force) {
  74                 return;
  75         }
  76
  77         //Delay if we haven't met the interval time limit
  78         NSTimeInterval interval = [_delayDate timeIntervalSinceNow];
  79         if (interval > 0) {
  80                 ITDebugLog(@"Audioscrobbler: Delaying handshake attempt for %i seconds", interval);
  81                 [self performSelector:@selector(attemptHandshake) withObject:nil afterDelay:interval + 1];
  82                 return;
  83         }
  84
  85         NSString *user = [[NSUserDefaults standardUserDefaults] stringForKey:@"audioscrobblerUser"];
  86         if (!_handshakeCompleted && user) {
  87                 NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://post.audioscrobbler.com/?hs=true&p=1.1&c=%@&v=%@&u=%@", AUDIOSCROBBLER_ID, AUDIOSCROBBLER_VERSION, user]];
  88
  89                 _currentStatus = AudioscrobblerRequestingHandshakeStatus;
  90                 _responseData = [[NSMutableData alloc] init];
  91                 [NSURLConnection connectionWithRequest:[NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:15] delegate:self];
  92         }
  93 }
  94
  95 - (BOOL)handshakeCompleted
  96 {
  97         return _handshakeCompleted;
  98 }
  99
 100 - (void)submitTrack:(NSString *)title artist:(NSString *)artist album:(NSString *)album length:(int)length
 101 {
 102         ITDebugLog(@"Audioscrobbler: Adding a new track to the submission queue.");
 103         NSDictionary *newTrack = [NSDictionary dictionaryWithObjectsAndKeys:title,
 104                                                                                                                                                 @"title",
 105                                                                                                                                                 artist,
 106                                                                                                                                                 @"artist",
 107                                                                                                                                                 (album == nil) ? @"" : album,
 108                                                                                                                                                 @"album",
 109                                                                                                                                                 [NSString stringWithFormat:@"%i", length],
 110                                                                                                                                                 @"length",
 111                                                                                                                                                 [[NSDate date] descriptionWithCalendarFormat:@"%Y-%m-%d %H:%M:%S" timeZone:nil locale:nil],
 112                                                                                                                                                 @"time",
 113                                                                                                                                                 nil, nil];
 114         [_tracks addObject:newTrack];
 115         [self submitTracks];
 116 }
 117
 118 - (void)submitTracks
 119 {
 120         if (!_handshakeCompleted) {
 121                 [self attemptHandshake:NO];
 122                 return;
 123         }
 124
 125         NSString *user = [[NSUserDefaults standardUserDefaults] stringForKey:@"audioscrobblerUser"], *passString = [PreferencesController getKeychainItemPasswordForUser:user];
 126         char *pass = (char *)[passString UTF8String];
 127
 128         if (passString == nil) {
 129                 NSLog(@"Audioscrobbler: Access denied to user password");
 130                 return;
 131         }
 132
 133         NSTimeInterval interval = [_delayDate timeIntervalSinceNow];
 134         if (interval > 0) {
 135                 ITDebugLog(@"Audioscrobbler: Delaying track submission for %f seconds", interval);
 136                 [self performSelector:@selector(submitTracks) withObject:nil afterDelay:interval + 1];
 137                 return;
 138         }
 139
 140         int i;
 141         NSMutableString *requestString;
 142         NSString *authString, *responseHash = @"";
 143         unsigned char *buffer;
 144         EVP_MD_CTX ctx;
 145
 146         ITDebugLog(@"Audioscrobbler: Submitting queued tracks");
 147
 148         if ([_tracks count] == 0) {
 149                 ITDebugLog(@"Audioscrobbler: No queued tracks to submit.");
 150                 return;
 151         }
 152
 153         //Build the MD5 response string we send along with the request
 154         buffer = malloc(EVP_MD_size(EVP_md5()));
 155         EVP_DigestInit(&ctx, EVP_md5());
 156         EVP_DigestUpdate(&ctx, pass, strlen(pass));
 157         EVP_DigestFinal(&ctx, buffer, NULL);
 158
 159         for (i = 0; i < 16; i++) {
 160                 responseHash = [responseHash stringByAppendingFormat:@"%0.2x", buffer[i]];
 161         }
 162
 163         free(buffer);
 164         buffer = malloc(EVP_MD_size(EVP_md5()));
 165         char *cat = (char *)[[responseHash stringByAppendingString:_md5Challenge] UTF8String];
 166         EVP_DigestInit(&ctx, EVP_md5());
 167         EVP_DigestUpdate(&ctx, cat, strlen(cat));
 168         EVP_DigestFinal(&ctx, buffer, NULL);
 169
 170         responseHash = @"";
 171         for (i = 0; i < 16; i++) {
 172                 responseHash = [responseHash stringByAppendingFormat:@"%0.2x", buffer[i]];
 173         }
 174         free(buffer);
 175
 176         authString = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL, (CFStringRef)[NSString stringWithFormat:@"u=%@&s=%@", user, responseHash], NULL, NULL, kCFStringEncodingUTF8);
 177         requestString = [[NSMutableString alloc] initWithString:authString];
 178         [authString release];
 179
 180         //We can only submit ten tracks at a time
 181         for (i = 0; (i < [_tracks count]) && (i < 10); i++) {
 182                 NSDictionary *nextTrack = [_tracks objectAtIndex:i];
 183                 NSString *trackString;
 184
 185                 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);
 186                 [requestString appendString:trackString];
 187                 [trackString release];
 188         }
 189
 190         //Create and send the request
 191         NSMutableURLRequest *request = [[NSURLRequest requestWithURL:_postURL cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:15] mutableCopy];
 192         [request setHTTPMethod:@"POST"];
 193         [request setHTTPBody:[requestString dataUsingEncoding:NSUTF8StringEncoding]];
 194         _currentStatus = AudioscrobblerSubmittingTracksStatus;
 195         _responseData = [[NSMutableData alloc] init];
 196         [NSURLConnection connectionWithRequest:request delegate:self];
 197         [requestString release];
 198         [request release];
 199
 200         //If we have tracks left, submit again after the interval seconds
 201 }
 202
 203 - (void)handleAudioscrobblerNotification:(NSNotification *)note
 204 {
 205         if ([[note name] isEqualToString:@"AudioscrobblerHandshakeComplete"]) {
 206                 if ([_tracks count] > 0) {
 207                         [self performSelector:@selector(submitTracks) withObject:nil afterDelay:2];
 208                 }
 209         }
 210 }
 211
 212 #pragma mark -
 213
 214 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
 215 {
 216         ITDebugLog(@"Audioscrobbler: Connection error \"%@\"", error);
 217 }
 218
 219 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
 220 {
 221         [_responseData appendData:data];
 222 }
 223
 224 - (void)connectionDidFinishLoading:(NSURLConnection *)connection
 225 {
 226         NSString *string = [[NSString alloc] initWithData:_responseData encoding:NSASCIIStringEncoding];
 227         NSArray *lines = [string componentsSeparatedByString:@"\n"];
 228         NSString *responseAction = nil;
 229
 230         if ([lines count] > 0) {
 231                 responseAction = [lines objectAtIndex:0];
 232         }
 233
 234         if (_currentStatus == AudioscrobblerRequestingHandshakeStatus) {
 235                 if ([lines count] < 2) {
 236                         //We have a protocol error
 237                 }
 238                 if ([responseAction isEqualToString:@"UPTODATE"] || (([responseAction length] > 5) && [[responseAction substringToIndex:5] isEqualToString:@"UPDATE"])) {
 239                         if ([lines count] >= 4) {
 240                                 _md5Challenge = [[lines objectAtIndex:1] retain];
 241                                 _postURL = [[NSURL alloc] initWithString:[lines objectAtIndex:2]];
 242                                 _handshakeCompleted = YES;
 243                                 [[NSNotificationCenter defaultCenter] postNotificationName:@"AudioscrobblerHandshakeComplete" object:self];
 244                         } else {
 245                                 //We have a protocol error
 246                         }
 247                 } else if (([responseAction length] > 5) && [[responseAction substringToIndex:5] isEqualToString:@"FAILED"]) {
 248                         //We have a error
 249                 } else if ([responseAction isEqualToString:@"BADUSER"]) {
 250                         //We have a bad user
 251                 } else {
 252                         //We have a protocol error
 253                 }
 254         } else if (_currentStatus == AudioscrobblerSubmittingTracksStatus) {
 255                 if ([responseAction isEqualToString:@"OK"]) {
 256                 } else if ([responseAction isEqualToString:@"BADAUTH"]) {
 257                         //Bad auth
 258                 } else if (([responseAction length] > 5) && [[responseAction substringToIndex:5] isEqualToString:@"FAILED"]) {
 259                         //Failed
 260                 }
 261         }
 262
 263         //Handle the final INTERVAL response
 264         if (([[lines objectAtIndex:[lines count] - 2] length] > 9) && [[[lines objectAtIndex:[lines count] - 2] substringToIndex:8] isEqualToString:@"INTERVAL"]) {
 265                 int seconds = [[[lines objectAtIndex:[lines count] - 2] substringFromIndex:9] intValue];
 266                 ITDebugLog(@"Audioscrobbler: INTERVAL %i", seconds);
 267                 [_delayDate release];
 268                 _delayDate = [[NSDate dateWithTimeIntervalSinceNow:seconds] retain];
 269         } else {
 270                 ITDebugLog(@"No interval response.");
 271                 //We have a protocol error
 272         }
 273
 274         [string release];
 275         [_responseData release];
 276 }
 277
 278 @end