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我为我的应用程序使用 Flickr API 来管理用户的照片。我决定使用 Apple 的类进行身份验证，它对我来说效果很好。现在我的应用程序已经过身份验证，并拥有所有必要的令牌和密钥，因此可以通过 flickr.photos.search、flickr.test.login 等方法的身份验证执行 GET 请求。但我花了几天时间尝试使用http://api.flickr.com/services/upload/ 和他们的说明来执行上传。他们说请求应该有参数“照片”，并且这个参数不应该包含在签名中。这很清楚，但我不知道如何在请求中实现这个参数。

#import "FlickrUploader.h"
#import "HMACSH1.h"
#import "Prefs.h"
#import "NSString+URLEncode.h"

@implementation FlickrUploader

- (void)uploadPhotoAtPath:(NSString*)filePath {

    NSString *upload_api_url = @"http://api.flickr.com/services/upload/";
    NSString *oauth_nonce = [NSString stringWithFormat:@"%d", 10000000 + arc4random()%1000000];
    NSString *oauth_timestamp   = [NSString stringWithFormat:@"%d", (long)[[NSDate date] timeIntervalSince1970]];
    NSString *oauth_consumer_key = CONSUMER_KEY;
    NSString *oauth_signature_method = @"HMAC-SHA1";
    NSString *oauth_version = @"1.0";
    NSString *oauth_token = [[NSUserDefaults standardUserDefaults] objectForKey:OAUTH_ACCESS_TOKEN_KEY];
//creating basestring to make signature without a 'photo' argument according to API   
    NSMutableString *basestring = [[NSMutableString alloc] initWithCapacity:8];

    [basestring appendFormat:@"&oauth_consumer_key=%@",oauth_consumer_key];
    [basestring appendFormat:@"&oauth_nonce=%@",oauth_nonce];    
    [basestring appendFormat:@"&oauth_signature_method=%@",oauth_signature_method];
    [basestring appendFormat:@"&oauth_timestamp=%@",oauth_timestamp];
    [basestring appendFormat:@"&oauth_token=%@", oauth_token];
    [basestring appendFormat:@"&oauth_version=%@",oauth_version];
//this is may class to make HMAC-SHA1 signature (it works for authentication and for GET requests)
    HMACSH1 *hMACSH1 = [[HMACSH1 alloc] init];

    NSMutableString *urlEncodedBaseString = [[NSMutableString alloc] initWithCapacity:3];
    [urlEncodedBaseString appendString:@"POST"];
    [urlEncodedBaseString appendFormat:@"&%@",[upload_api_url urlEncodedString]];
    [urlEncodedBaseString appendFormat:@"&%@",[basestring urlEncodedString]];


    NSString *oauth_token_secret = [[NSUserDefaults standardUserDefaults] objectForKey:OAUTH_TOKEN_SECRET_KEY];

    NSString *hash_key = [CONSUMER_SECRET stringByAppendingFormat:@"&%@",oauth_token_secret];

    NSString *oauth_signature = [hMACSH1 hmacSH1base64ForData:urlEncodedBaseString keyValue:hash_key];

//creating url for request    
    NSMutableString *urlString = [[NSMutableString alloc] initWithCapacity:8];

    [urlString appendFormat:@"%@",upload_api_url];
    [urlString appendFormat:@"?"];
    [urlString appendString:basestring];
    [urlString appendFormat:@"&oauth_signature=%@", oauth_signature];

    NSURL *authURL = [[NSURL alloc] initWithString:urlString]; 

    NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:authURL
                                                           cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                       timeoutInterval:30.0];
    request.HTTPMethod = @"POST";

    UIImage *img = [UIImage imageNamed:filePath];
    NSData *imgData = UIImageJPEGRepresentation(img, 0.8);

//here I don't know what to do :((( perhaps NSOutputStream



}
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