短縮URLを作るNSString (shortURL) カテゴリ

昨日の短縮URLを展開するNSString (expandURL) カテゴリと対となるカテゴリ。
Bitly APIを使用しているので、事前にBitlyのアカウントとAPIキーを取得しておく必要がある。また、JSON形式の返り値をNSDictionaryに変換するためにSBJSONを使用している。


NSString+shortURL.h

#import <Foundation/NSString.h>

@interface NSString (shortURL)

+ (NSString *)shortURL:(NSString *)longUrl;

@end

NSString+shortURL.m

#import "NSString+shortURL.h"

#import "SBJson.h"

static NSString *kBitlyWrapperString = @"http://api.bit.ly/shorten?version=2.0.1&format=json&longUrl=";

static NSString *kBitlyFootterString = @"&login=ログイン名&apiKey=APIキー";

@implementation NSString (shortURL)

+ (NSString *)shortURL:(NSString *)longUrl{

NSString *aaa = nil;

NSString *escapeStr = (NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)longUrl, NULL, CFSTR(":/?#[]@!$&’()*+,;="), kCFStringEncodingUTF8);

NSString *str = [NSString stringWithFormat:@"%@%@%@",kBitlyWrapperString,escapeStr,kBitlyFootterString];

NSURL *url = [NSURL URLWithString:str];

NSData *data = [NSData dataWithContentsOfURL:url];

if (data) {

NSString *tempStr = [[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]autorelease];

NSDictionary *aDic = [tempStr JSONValue];

NSLog(@"%@",[aDic description]);

NSNumber *errorCode = [aDic objectForKey:@"errorCode"];

NSString *statusCode = [aDic objectForKey:@"statusCode"];

if ([errorCode intValue] == 0 && [statusCode isEqualToString:@"OK"]) {

NSDictionary *results = [[aDic objectForKey:@"results"]objectForKey:longUrl];

NSString *shortUrl = [results objectForKey:@"shortUrl"];

aaa = shortUrl;

} else {

aaa = longUrl;

}

} else {

aaa = longUrl;

}

return aaa;

}

@end