从iPhone App上传到Amazon S3服务

Question

我正在把这头发拉出来...我正在使用ASIHTTPRequest(http://allseeing-i.com/ASIHTTPRequest/)包装器库来访问Amazon S3存储.我能够很好地连接并抓住一个桶列表没有任何问题.我很沮丧的是尝试将新对象(照片)上传(PUT和/或POST)到现有存储桶.我正在关注亚马逊的文件,(至少我认为我是.)但似乎没有任何效果.

拜托,有人在我跳出窗外之前帮助我.我不想死.:-(

提前感谢我能得到的任何帮助.

L.

Answer 1

这是使用PUT的基本示例.显然你应该在现实世界中使用队列而不是同步请求.

如果您更改amz标头,请不要忘记按照亚马逊的说明更新'canonicalizedAmzHeaders'.

#import "ASIHTTPRequest.h"
#import <CommonCrypto/CommonHMAC.h>

...

- (void)testS3
{
   NSString *filePath = @"/path/to/file";
   NSString *contentType = @"text/plain";
   NSString *bucket = @"mybucket";
   NSString *path = @"test";
   NSString *secretAccessKey = @"my-secret-access-key";
   NSString *accessKey = @"my-access-key";

   NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
   [dateFormatter setDateFormat:@"EEE, d MMM yyyy HH:mm:ss zzzz"];
   NSString *date = [dateFormatter stringFromDate:[NSDate date]];

   ASIHTTPRequest *request = [[[ASIHTTPRequest alloc] initWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://%@.s3.amazonaws.com/%@",bucket,path]]] autorelease];
   [request setPostBodyFilePath:filePath];
   [request setShouldStreamPostDataFromDisk:YES];
   [request setRequestMethod:@"PUT"];

   [request addRequestHeader:@"x-amz-acl" value:@"private"];
   [request addRequestHeader:@"Content-Type" value:contentType];
   [request addRequestHeader:@"Date" value:date];

   NSString *canonicalizedAmzHeaders = @"x-amz-acl:private";
   NSString *canonicalizedResource = [NSString stringWithFormat:@"/%@/%@",bucket,path];
   NSString *stringToSign = [NSString stringWithFormat:@"PUT\n\n%@\n%@\n%@\n%@",contentType,date,canonicalizedAmzHeaders,canonicalizedResource];

   NSString *signature = [self base64forData:[self HMACSHA1withKey:secretAccessKey forString:stringToSign]];
   NSString *auth = [NSString stringWithFormat:@"AWS %@:%@",accessKey,signature];
   [request addRequestHeader:@"Authorization" value:auth];


   [request start];
   NSLog(@"%@",[request responseString]);

}


// Source: http://stackoverflow.com/questions/476455/is-there-a-library-for-iphone-to-work-with-hmac-sha-1-encoding

- (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];
}

//Source http://www.cocoadev.com/index.pl?BaseSixtyFour

- (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];
}

Answer 2

如果它对任何发现这个问题的人有帮助 - 现在内置了ASIHTTPRequest的基本S3支持:

http://allseeing-i.com/ASIHTTPRequest/S3

我一直在考虑添加S3支持多年,但你的问题推到了队列的前面:)