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1255

answers:

4

I am pulling my hair out on this one... I am using the ASIHTTPRequest (http://allseeing-i.com/ASIHTTPRequest/) wrapper library for accessing Amazon S3 storage. I am able to connect just fine and grab a listing of buckets without any problems. My frustration is with trying to UPLOAD (PUT and/or POST) a new object (a photo) to an existing bucket. I am following Amazon's documentation to the letter, (at least I think I am.) but nothing seems to work.

Please, someone help me before I jump out of a window. I don't want to die. :-(

Thanks in advance for ANY help I can get.

L.

+7  A: 

Here is a basic example using PUT. Obviously you should be using a queue rather than a synchronous request in the real world.

If you change the amz headers, don't forget to update 'canonicalizedAmzHeaders' as per Amazon's instructions.

#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];
}
pokeb
You Rock pokeb. Really appreciate the help. My canonicalizedAmzHeader was all screwy. I'm having one other problem however... I tried to "add" the request to a queue and start it from there but to no avail. Here is my code:[networkQueue cancelAllOperations];[request..... definitions go here];[networkQueue addOperation:request];[networkQueue go];What things should I be on the look out for when adding a request to a queue?thanks again for the help!L.
Leachy Peachy
Did you create the queue first?(eg: [self setNetworkQueue:[ASINetworkQueue queue]])
pokeb
You were right again. My networkQueue instance variable was never getting initialized. You ARE the man. Really appreciate the help.
Leachy Peachy
A: 

There is also the Connection Kit Cocoa framework, which is able to upload data to different services, including Amazon S3. I am pretty sure it has some starting points for you in its source.

Tobias Svensson
+5  A: 

In case it's helpful for anyone finding this question - Basic S3 support is now built in to ASIHTTPRequest:

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

I'd been thinking about adding S3 support for ages, but your question nudged it to the front of the queue :)

pokeb
NICE! I love the wrapper. I've become your biggest fan. Keep up the GREAT work!
Leachy Peachy
A: 

Execpt that Connection Kit (Connection.framework) has ZERO documentation - you'll get nowhere fast trying to use it.

Abe