Question

我在谷歌搜索过去两天关于在我的可可项目中使用amazon multipart上传api for mac。我已经下载了适用于ios的AWS sdk。但没有找到如何在可可项目中使用该sdk。任何人都可以提供一些示例代码来实现使用亚马逊S3分段上传的多部分上传???

修改
由于适用于IOS的AWS SDK与Cocoa应用程序不兼容，我使用Rest api使用libcurl上传文件。我正在使用以下代码（通过引用http://dextercoder.blogspot.in/2012/02/multipart-upload-to-amazon-s3-in-three.html）：

- (void)initUpload
{
    NSDate* now = [NSDate date];
    NSDateFormatter* formatter = [[[NSDateFormatter alloc] init] autorelease];

    [formatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"] autorelease]];
    [formatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
    [formatter setDateFormat:@"eee, dd MMM yyyy HH:mm:ss "];
    NSString *strDate = [NSString stringWithFormat:@"%@GMT", [formatter stringFromDate:now]];
    NSString *strDateString = [NSString stringWithFormat:@"Date: %@", strDate];
    const char *date = [strDateString UTF8String];

    NSString *stringToSign = [NSString stringWithFormat:@"POST\n\n\n%@\n/MY_BUCKET/test.pdf?uploads",strDate];
    NSString *signature = [self base64forData:[self HMACSHA1withKey:MY_SECRET forString:stringToSign]];
    signature = [signature stringByReplacingOccurrencesOfString:@"+" withString:@"%2B"];
    signature = [signature stringByReplacingOccurrencesOfString:@"/" withString:@"%2F"];
    signature = [signature stringByReplacingOccurrencesOfString:@"=" withString:@"%3D"];
    NSString *strAuthorization = [NSString stringWithFormat:@"Authorization: AWS MY_ACCESSID:%@", signature];
    const char *sig = [strAuthorization UTF8String];

    curl_global_init(CURL_GLOBAL_ALL);
    CURL *curlHandle = curl_easy_init();
    struct curl_slist *headers=NULL;
    headers = curl_slist_append(headers, date);
    headers = curl_slist_append(headers, sig);
    CURLcode res;


    if (curlHandle) {
        curl_easy_setopt(curlHandle, CURLOPT_URL, "http://MY_BUCKET.s3.amazonaws.com/test.pdf?uploads");
        curl_easy_setopt(curlHandle, CURLOPT_POST, 1);
        curl_easy_setopt(curlHandle, CURLOPT_POSTFIELDS, "");
        curl_easy_setopt(curlHandle, CURLOPT_HTTPHEADER, headers);
        curl_easy_setopt(curlHandle, CURLOPT_VERBOSE,1L);            
        res = curl_easy_perform(curlHandle);

        curl_easy_cleanup(curlHandle);       
    }
}

- (NSData *)HMACSHA1withKey:(NSString *)key forString:(NSString *)string
{
    NSData *clearTextData = [string dataUsingEncoding:NSUTF8StringEncoding];
    NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];

    uint8_t digest[CC_SHA1_DIGEST_LENGTH] = {0};

    CCHmacContext hmacContext;
    CCHmacInit(&hmacContext, kCCHmacAlgSHA1, keyData.bytes, keyData.length);
    CCHmacUpdate(&hmacContext, clearTextData.bytes, clearTextData.length);
    CCHmacFinal(&hmacContext, digest);

    return [NSData dataWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];
}

- (NSString *)base64forData:(NSData *)data
{
    static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    if ([data length] == 0)
        return @"";

    char *characters = malloc((([data length] + 2) / 3) * 4);
    if (characters == NULL)
        return nil;
    NSUInteger length = 0;

    NSUInteger i = 0;
    while (i < [data length])
    {
        char buffer[3] = {0,0,0};
        short bufferLength = 0;
        while (bufferLength < 3 && i < [data length])
        buffer[bufferLength++] = ((char *)[data bytes])[i++];

        //  Encode the bytes in the buffer to four characters, including padding "=" characters if necessary.
        characters[length++] = encodingTable[(buffer[0] & 0xFC) >> 2];
        characters[length++] = encodingTable[((buffer[0] & 0x03) << 4) | ((buffer[1] & 0xF0) >> 4)];
        if (bufferLength > 1)
            characters[length++] = encodingTable[((buffer[1] & 0x0F) << 2) | ((buffer[2] & 0xC0) >> 6)];
        else characters[length++] = '=';
        if (bufferLength > 2)
            characters[length++] = encodingTable[buffer[2] & 0x3F];
        else characters[length++] = '=';        
    }

     return [[[NSString alloc] initWithBytesNoCopy:characters length:length encoding:NSASCIIStringEncoding freeWhenDone:YES] autorelease];
}

但它的回应是

“＆lt; HTTP / 1.0 403禁止
SignatureDoesNotMatch我们计算的请求签名与您提供的签名不匹配。检查您的密钥和签名方法。“

我知道我做错了什么???

Answer 1

您可以通过SDK本身随附的AWS服务（如S3，SDB等）获得基本示例： http://docs.amazonwebservices.com/mobile/sdkforios/gsg/Welcome.html?r=1498

Answer 2

你可以从http://dextercoder.blogspot.in/2012/02/multipart-upload-to-amazon-s3-in-three.html引用java代码。讲述如何在没有AWS的情况下在多部件中上传文件。

amazon multipart上传api for mac

2 个答案: