获得百度音乐盒音乐的下载地址

//
//  BaiduMusicBoxParser.h
//
//  Created by [e-mail] on 12-3-11.
//  Copyright (c) 2012年. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "ASIHTTPRequest.h"
#import "ASINetworkQueue.h"
#import "TFHpple.h"
#import "XPathQuery.h"
#import "TFHppleElement.h"

@interface BaiduMusicBoxParser : NSObject

+ (BaiduMusicBoxParser*)shareInstance;

/**
 返回的数组结构:
 [
    {
        album = "\U672a\U6765\U5c5e\U4e8e\U5b69\U5b50 \U4e2d\U5916\U540d\U66f2\U7cbe\U9009";
        artist = "\U6768\U9e3f\U5e74";
        "download_url" = "http://mp3.baidu.com/j?j=2&url=http%3A%2F%2Fzhangmenshiting.baidu.com%2Fdata2%2Fmusic%2F9405342%2F9405342.mp3%3Fxcode%3Dfdaccf3ade1f2d967110c329ab53b046";
        quality = "MP3(3.9M)";
        "song_name" = "we are the world";
    },...
 ]
 **/
- (NSArray*)baiduSongsInfoBySearchingSongName:(NSString *)name pageNumber:(int)pgNO;

//获取歌词
- (NSString*)lyricsWithSong:(NSString*)sName;

//获取百度歌手列表,从大写字母A~Z，其他为0
/**
 [
    "A"=[
        AOK,
        Alizee,...
    ],
    "B"={
        BOBO,
        白雪,...
    },...
 ]
 **/
- (NSArray*)allArtistsListOfBaiduMp3;
- (NSArray*)artistsListOfBaiduMp3ByFilterCharacter:(NSString*)character;

@end

//
//  BaiduMusicBoxParser.m
//
//  Created by [e-mail] on 12-3-11.
//  Copyright (c) 2012年. All rights reserved.
//

#import "BaiduMusicBoxParser.h"
#import "GDataXMLNode.h"

static BaiduMusicBoxParser *parser_ = nil;

@interface BaiduMusicBoxParser (Private)
/**
 返回的数组结构:
 [
 "http://box.zhangmen.baidu.com/m?word=mp3,,,[love+of+my+life]&gate=1&ct=134217728&tn=baidumt,love+of+my+life&si=love+of+my+life;;keith%20martin;;0;;0&lm=-1&attr=0,0&rf=zb&size=1992294",
 ...
 ]
 
 sName:歌曲名称
 pgNo:页数。默认为0.
 **/
- (NSArray*)jumpToURLBySongName:(NSString*)sName pageNumber:(int)pgNo;
@end

@implementation BaiduMusicBoxParser

- (void)dealloc{
    [super dealloc];
}

+ (BaiduMusicBoxParser*)shareInstance{
    if (!parser_) {
        parser_ = [[self alloc] init];
    }
    return parser_;
}

- (id)init{
    if ([super init]) {
        
    }
    return self;
}

- (NSArray*)jumpToURLBySongName:(NSString*)sName pageNumber:(int)pgNo{
    if(sName==nil || [sName length]==0)return nil;
    if (pgNo<0) {
        return nil;
    }
    
    //去除两端的空格
    [sName stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    
    //把歌曲拼凑成格式如：love+of+my+life 的形式
    NSArray *nameArr = [sName componentsSeparatedByString:@" "];
    NSMutableString *newName = [NSMutableString stringWithCapacity:0];
    if (nameArr && [nameArr count]) {
        for (NSString *s in nameArr) {
            [newName appendFormat:@"%@+",s];
        }
        //去掉最后一个 '+'号
        if ([newName length]) {
            [newName deleteCharactersInRange:NSMakeRange([newName length]-1, 1)];
        }
    }
    //用户输入的是整个字符串，没有空格
    if (nameArr && [nameArr count]==1) {
        [newName appendString:[nameArr objectAtIndex:0]];
    }
    
    //组合地址并编码
    NSString *requestURL = [NSString stringWithFormat:@"http://mp3.baidu.com/m?word=%@&lm=-1&f=ms&tn=baidump3&ct=134217728&lf=&rn=&pn=%i",newName,pgNo*30];
    NSString *requestURLWithEnc = [requestURL stringByAddingPercentEscapesUsingEncoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];
    //NSLog(@"===%@",requestURLWithEnc);
    
    //发送请求，获得返回数据
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:requestURLWithEnc]];
    [request startSynchronous];
    
    if ([request error]) {
        return nil;
    }
    
    //接收返回数据
    //获取id = "songResults"的节点
    TFHpple *helper = [TFHpple hppleWithHTMLData:[request responseData]];
    NSString *xPathDescription = @"//*[@id=\"songResults\"]";
    TFHppleElement *divElement = [helper peekAtSearchWithXPathQuery:xPathDescription];
    NSArray *children = divElement.children;
    
    //return
    NSMutableArray *jumpToPageURLArray = [NSMutableArray arrayWithCapacity:0];
    
     //获得table
    TFHppleElement *tb = [children objectAtIndex:0];
    NSArray *tbodyChildren = tb.children;
    if (tbodyChildren && [tbodyChildren count]) {
        for (TFHppleElement *trElement in tbodyChildren) {
            NSArray *tdArr = trElement.children;
            if (tdArr && [tdArr count]) {
                for (TFHppleElement *tdNode in tdArr) {
                    //<td class="second">
                    if (tdNode && [[tdNode objectForKey:@"class"] isEqualToString:@"down"]) {
                        NSArray *tdNodeArr = tdNode.children;
                        if (tdNodeArr && [tdNodeArr count]) {
                            TFHppleElement *aNode = tdNode.firstChild;
                            
                            if (aNode) {
                                //获得要跳转的地址
                                NSString *jumpToURL = [aNode objectForKey:@"href"];
                                if ([jumpToURL length]) {
                                    [jumpToPageURLArray addObject:jumpToURL];
                                }
                            }
                        }
                    }
                }
            }
        }
    }
    
    //跳转界面地址数组
    //NSLog(@"共有跳转地址:%i个,它们是:%@",[jumpToPageURLArray count],jumpToPageURLArray);
    if ([jumpToPageURLArray count]) {
        return jumpToPageURLArray;
    }
    return nil;
}

- (NSArray*)baiduSongsInfoBySearchingSongName:(NSString *)name pageNumber:(int)pgNO{
    if(name==nil || [name length]==0)return nil;
    if (pgNO<0) return nil;
    
    NSArray *jumpToURLArr = [self jumpToURLBySongName:name pageNumber:pgNO];
    
    //获得跳转地址的数组
    NSMutableArray *musicInfoArr = [NSMutableArray arrayWithCapacity:0];
    if (jumpToURLArr && [jumpToURLArr count]) {
        for (NSString *urlStr in jumpToURLArr) {
            ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:urlStr]];
            [request startSynchronous];
            
            //获得返回数据
            NSData *responseData = [request responseData];
            if (responseData) {
                TFHpple *helper = [TFHpple hppleWithHTMLData:responseData];
                if (helper) {
                    //获得歌曲的下载地址
                    NSString *xPath = @"//*[@id='downlink']";
                    TFHppleElement *downloadLinkNode = [helper peekAtSearchWithXPathQuery:xPath];
                    NSString *musicDownloadURI = [downloadLinkNode objectForKey:@"href"];
                    NSString *musicDownloadURL = [NSString stringWithFormat:@"http://mp3.baidu.com%@",musicDownloadURI];
                    //NSLog(@"======下载地址是：%@",musicDownloadURL);
                    
                    if (musicDownloadURI && [musicDownloadURI length]) {
                        //获得歌手名字
                        /**<div class="songinfo-more">
                         <span class="singer gray">歌手：
                         <a href="http://mp3.baidu.com/singerlist/back ii back.html" target="_blank">back ii back</a>
                         </span> 
                         <span class="album gray">所属专辑：
                         《<a href="http://mp3.baidu.com/albumlist/back ii back;;;;;;back ii back.html" target="_blank">back ii back</a>
                         》</span>
                         </div>
                         **/
                        NSString *aritistNameXpath = @"//*[@class='songinfo-more']";
                        TFHppleElement *aritistNameNode = [helper peekAtSearchWithXPathQuery:aritistNameXpath];
                        TFHppleElement *spanNode = aritistNameNode.firstChild;
                        TFHppleElement *aNode = spanNode.firstChild;
                        NSString *artistName = aNode.content;
                        //NSLog(@"*************歌手:%@",artistName);
                        
                        //获得专辑名字
                        TFHppleElement *albumNode = [aritistNameNode.children objectAtIndex:1];
                        TFHppleElement *AaNode = albumNode.firstChild;
                        NSString *albumName = AaNode.content;
                        //NSLog(@"*************专辑:%@",albumName);
                        
                        //获得歌曲的品质
                        /**
                         <div class="format gray">品质：<b>MP3(4.0M)</b></div>
                         **/
                        NSString *qulityXpath = @"//*[@class='format gray']";
                        TFHppleElement *qulityNode = [helper peekAtSearchWithXPathQuery:qulityXpath];
                        TFHppleElement *bNode = qulityNode.firstChild;
                        NSString *qulityDescription = bNode.content;
                        //NSLog(@"*************品质:%@",qulityDescription);
                        
                        if (musicDownloadURI && [musicDownloadURI length]) {
                            NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithCapacity:0];
                            [dic setObject:musicDownloadURL forKey:@"download_url"];
                            [dic setObject:name forKey:@"song_name"];
                            [dic setObject:artistName?artistName:[NSNull null] forKey:@"artist"];
                            [dic setObject:albumName?albumName:[NSNull null] forKey:@"album"];
                            [dic setObject:qulityDescription?qulityDescription:[NSNull null] forKey:@"quality"];
                            
                            if ([dic count]) {
                                [musicInfoArr addObject:dic];
                            }
                        }
                    }
                } 
            }
        }
    }
    
    //NSLog(@"歌曲信息数组-------------%@",musicInfoArr);
    if ([musicInfoArr count]) {
        return musicInfoArr;
    }
    return nil;
}

- (NSString*)lyricsWithSong:(NSString*)sName {
    return nil;
}

- (NSArray*)allArtistsListOfBaiduMp3{
    return nil;
}
- (NSArray*)artistsListOfBaiduMp3ByFilterCharacter:(NSString*)character{
    return nil;
}

@end