iphone - 从 iPhone 应用程序上传到 Amazon S3 服务

Question

我在这个问题上大发雷霆……我正在使用 ASIHTTPRequest ( http://allseeing-i.com/ASIHTTPRequest/ ) 包装库来访问 Amazon S3 存储。我能够很好地连接并获取存储桶列表而没有任何问题。我的挫败感是尝试将新对象（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。

在我跳出窗户之前，请有人帮助我。我不想死。:-(

提前感谢我能得到的任何帮助。

L.

Answer 1

这是一个使用 PUT 的基本示例。显然，您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 Amazon 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 ASIHTTPRequest 中内置了基本 S3 支持：

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

我一直在考虑添加 S3 支持很长时间了，但是你的问题把它推到了队列的前面:)

Answer 3

看起来亚马逊现在有一个 iOS SDK，目前（2011 年 4 月）处于测试阶段： http: //aws.amazon.com/sdkforios/。

Answer 4

还有Connection Kit Cocoa 框架，它能够将数据上传到不同的服务，包括 Amazon S3。我很确定它的源代码为您提供了一些起点。