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 <openssl/evp.h>
  16 #import <ITFoundation/ITDebug.h>
  17
  18 static AudioscrobblerController *_sharedController = nil;
  19
  20 @implementation AudioscrobblerController
  21
  22 + (void)load
  23 {
  24         NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  25         [[AudioscrobblerController sharedController] submitTrack:@"Immigrant Song" artist:@"Led Zeppelin" album:@"How The West Was Won" length:221];
  26         [[AudioscrobblerController sharedController] submitTrack:@"Comfortably Numb" artist:@"Pink Floyd" album:@"The Wall" length:384];
  27         [[AudioscrobblerController sharedController] submitTracks];
  28         [pool release];
  29 }
  30
  31 + (AudioscrobblerController *)sharedController
  32 {
  33         if (!_sharedController) {
  34                 _sharedController = [[AudioscrobblerController alloc] init];
  35         }
  36         return _sharedController;
  37 }
  38
  39 - (id)init
  40 {
  41         if ( (self = [super init]) ) {
  42                 /*_handshakeCompleted = NO;
  43                 _md5Challenge = nil;
  44                 _postURL = nil;*/
  45
  46                 _handshakeCompleted = YES;
  47                 _md5Challenge = @"rawr";
  48                 _postURL = [NSURL URLWithString:@"http://audioscrobbler.com/"];
  49
  50                 _delayDate = nil;
  51                 _responseData = nil;
  52                 _tracks = [[NSMutableArray alloc] init];
  53                 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleAudioscrobblerNotification:) name:nil object:self];
  54         }
  55         return self;
  56 }
  57
  58 - (void)dealloc
  59 {
  60         [_md5Challenge release];
  61         [_postURL release];
  62         [_responseData release];
  63         [_tracks release];
  64         [super dealloc];
  65 }
  66
  67 - (void)attemptHandshake
  68 {
  69         //Delay if we haven't met the interval time limit
  70         NSTimeInterval interval = [_delayDate timeIntervalSinceNow];
  71         if (interval > 0) {
  72                 ITDebugLog(@"Audioscrobbler: Delaying handshake attempt for %i seconds", interval);
  73                 [self performSelector:@selector(attemptHandshake) withObject:nil afterDelay:interval + 1];
  74                 return;
  75         }
  76
  77         if (!_handshakeCompleted) {
  78                 NSString *version = [[[NSBundle bundleWithPath:[[NSWorkspace sharedWorkspace] fullPathForApplication:@"iTunes.app"]] infoDictionary] objectForKey:@"CFBundleVersion"], *user = @"Tristrex";
  79                 NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://post.audioscrobbler.com/?hs=true&p=1.1&c=tst&v=%@&u=%@", version, user]];
  80                 NSURLConnection *connection;
  81
  82                 _currentStatus = AudioscrobblerRequestingHandshakeStatus;
  83                 connection = [NSURLConnection connectionWithRequest:[NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:30] delegate:self];
  84         }
  85 }
  86
  87 - (BOOL)handshakeCompleted
  88 {
  89         return _handshakeCompleted;
  90 }
  91
  92 - (void)submitTrack:(NSString *)title artist:(NSString *)artist album:(NSString *)album length:(int)length
  93 {
  94         if (!_handshakeCompleted) {
  95                 [self attemptHandshake];
  96                 return;
  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,
 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 }
 112
 113 - (void)submitTracks
 114 {
 115         NSTimeInterval interval = [_delayDate timeIntervalSinceNow];
 116         if (interval > 0) {
 117                 ITDebugLog(@"Audioscrobbler: Delaying track submission for %i seconds", interval);
 118                 [self performSelector:@selector(attemptHandshake) withObject:nil afterDelay:interval + 1];
 119                 return;
 120         }
 121
 122         int i;
 123         NSMutableString *requestString;
 124         NSString *authString, *responseHash;
 125         char *pass = "waffles";
 126         unsigned char *buffer;
 127         EVP_MD_CTX ctx;
 128
 129         if (!_handshakeCompleted) {
 130                 [self attemptHandshake];
 131                 return;
 132         }
 133
 134         ITDebugLog(@"Audioscrobbler: Submitting queued tracks");
 135
 136         if ([_tracks count] == 0) {
 137                 ITDebugLog(@"Audioscrobbler: No queued tracks to submit.");
 138                 return;
 139         }
 140
 141         //Build the MD5 response string we send along with the request
 142         buffer = malloc(EVP_MD_size(EVP_md5()));
 143         EVP_DigestInit(&ctx, EVP_md5());
 144         EVP_DigestUpdate(&ctx, pass, strlen(pass));
 145         EVP_DigestFinal(&ctx, buffer, NULL);
 146
 147         for (i = 0; i < 16; i++) {
 148                 responseHash = [responseHash stringByAppendingFormat:@"%0.2x", buffer[i]];
 149         }
 150
 151         free(buffer);
 152         buffer = malloc(EVP_MD_size(EVP_md5()));
 153         char *cat = (char *)[[responseHash stringByAppendingString:_md5Challenge] UTF8String];
 154         EVP_DigestInit(&ctx, EVP_md5());
 155         EVP_DigestUpdate(&ctx, cat, strlen(cat));
 156         EVP_DigestFinal(&ctx, buffer, NULL);
 157
 158         responseHash = @"";
 159         for (i = 0; i < 16; i++) {
 160                 responseHash = [responseHash stringByAppendingFormat:@"%0.2x", buffer[i]];
 161         }
 162         free(buffer);
 163
 164         authString = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL, (CFStringRef)[NSString stringWithFormat:@"u=%@&s=%@", @"Tristrex", responseHash], NULL, NULL, kCFStringEncodingUTF8);
 165         requestString = [[NSMutableString alloc] initWithString:authString];
 166         [authString release];
 167
 168         //We can only submit ten tracks at a time
 169         for (i = 0; ([_tracks count] > 0) && (i < 10); i++) {
 170                 NSDictionary *nextTrack = [_tracks objectAtIndex:i];
 171                 NSString *trackString;
 172
 173                 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);
 174                 [requestString appendString:trackString];
 175                 [trackString release];
 176         }
 177
 178         //Create and send the request
 179         NSMutableURLRequest *request = [[NSURLRequest requestWithURL:_postURL cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:30] mutableCopy];
 180         [request setHTTPMethod:@"POST"];
 181         [request setHTTPBody:[requestString dataUsingEncoding:NSUTF8StringEncoding]];
 182         _currentStatus = AudioscrobblerSubmittingTracksStatus;
 183         //[NSURLConnection connectionWithRequest:request delegate:self];
 184         [requestString release];
 185         [request release];
 186
 187         //If we have tracks left, submit again after the interval seconds
 188 }
 189
 190 - (void)handleAudioscrobblerNotification:(NSNotification *)note
 191 {
 192         if ([[note name] isEqualToString:@"AudioscrobblerHandshakeComplete"]) {
 193                 if ([_tracks count] > 0) {
 194                         [self submitTracks];
 195                 }
 196                 [self submitTrack:@"Immigrant Song" artist:@"Led Zeppelin" album:@"How The West Was Won" length:221];
 197                 [self submitTrack:@"Comfortably Numb" artist:@"Pink Floyd" album:@"The Wall" length:384];
 198                 [self submitTracks];
 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                 NSLog(string);
 255         }
 256
 257         //Handle the final INTERVAL response
 258         if (([responseAction length] > 9) && [[responseAction substringToIndex:7] isEqualToString:@"INTERVAL"]) {
 259                 int seconds = [[[lines objectAtIndex:[lines count] - 1] substringFromIndex:9] intValue];
 260                 ITDebugLog(@"Audioscrobbler: INTERVAL %i", seconds);
 261                 _delayDate = [NSDate dateWithTimeIntervalSinceNow:seconds];
 262         } else {
 263                 //We have a protocol error
 264         }
 265
 266         [string release];
 267         [_responseData release];
 268 }
 269
 270 -(NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)redirectResponse
 271 {
 272         ITDebugLog(@"Audioscrobbler: Sending URL request.");
 273         NSLog(@"Sending request.");
 274         _responseData = [[NSMutableData alloc] init];
 275         return request;
 276 }
 277
 278 @end